WO2019185492A1 - Capteur de débit par pression différentielle pour dispositifs respiratoires à résistance à l'écoulement améliorée à abattant en plusieurs parties - Google Patents

Capteur de débit par pression différentielle pour dispositifs respiratoires à résistance à l'écoulement améliorée à abattant en plusieurs parties Download PDF

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Publication number
WO2019185492A1
WO2019185492A1 PCT/EP2019/057335 EP2019057335W WO2019185492A1 WO 2019185492 A1 WO2019185492 A1 WO 2019185492A1 EP 2019057335 W EP2019057335 W EP 2019057335W WO 2019185492 A1 WO2019185492 A1 WO 2019185492A1
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WO
WIPO (PCT)
Prior art keywords
flow
sensor
arrangement
flow sensor
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/057335
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German (de)
English (en)
Inventor
Wolfram Murr
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Hamilton Medical AG
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Hamilton Medical AG
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Publication date
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Publication of WO2019185492A1 publication Critical patent/WO2019185492A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/42—Orifices or nozzles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A61B5/087—Measuring breath flow
    • A61B5/0876—Measuring breath flow using means deflected by the fluid stream, e.g. flaps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/363—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction with electrical or electro-mechanical indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices

Definitions

  • the present invention relates to a differential pressure flow sensor comprising:
  • a sensor housing which defines a flow channel passing through the sensor housing, which can be traversed by fluid along a flow path which centrally defines a flow path and defines a virtual direction;
  • a shape variable flow resistance arrangement for providing a flow resistance in the flow channel
  • the flow resistance arrangement has:
  • differential pressure flow rate sensors which allow detection of a quantity of fluid flowing through the flow passage per unit time based on a pressure difference between the upstream fluid pressure and the downstream fluid pressure are inter alia proximal, near the patient, flow sensors (Flow sensors) in artificial respiration ventilators known by living things. This is also the preferred application in the present application, although not the only possible application, of the flow sensor described with the present application.
  • a generic flow sensor is known from WO 91/06830 A1. This document describes a flow sensor, which on the one hand should be as sensitive as possible during a ventilation operation on the sensor housing accumulating fluid and which on the other hand, both at low and at high flow rates as linear a relationship between the occurring across the flow resistance arrangement away pressure drop and the flow rate of the flow sensor by flowing fluid should have.
  • the respiratory gas supplied to the patient is conditioned, ie tempered and provided with a predetermined degree of humidity, in order to make the respiratory gas more compatible with the patient.
  • the patient also gives moisture to the expiratory breathing gas in his lung. This can result in a moisture precipitation in the flow sensor.
  • the precipitation of moisture keit on the flow channel radially outwardly bounding Kanalau derwan tion is further favored that, firstly, the exhaled Be breathing gas has a relative humidity close to saturation and that at the temperature of the exhaled breathing gas is higher than that Ambient temperature, on which the flow sensor is usually located.
  • the flow resistance arrangement of the known flow sensor comprises three flaps, which in their rest position in which they are not attached to respiratory gas. flows, greatly reduce the flow-through cross-sectional area of the flow channel in the region of their arrangement.
  • the flaps flow along the flow path, they are deflected against a restoring force, which returns the flaps in the rest position of the flow with respiratory gas.
  • the flow-through cross-sectional area of the flow channel is increased in the region of the arrangement of the flaps.
  • the known from WO 91/06830 A1 flow meter has as a first measure measure to reduce the sensitivity to never in the flow channel der realder moisture in the pressure sensing formations on both sides of the flow resistance arrangement on an inner tube, which stood with a radial Ab from the channel outer wall is arranged. This should enable the inner tube to heat up to the elevated temperature of the exhaled respiratory gas compared with the ambient temperature. Thus, due to a lack of temperature difference with respect to the flowing gas, no or at least less liquid would condense on the inner tube, especially the exhaled respiratory gas.
  • the annular gap between the inner tube and the inner tube surrounding the outer channel wall of the known flow sensor is used for the determination of the flow resistance arrangement on the sensor housing.
  • the fixing section the flow resistance arrangement of the known flow sensor runs fully constantly, ie closed to the flow path at the mounting location of Strö tion resistance arrangement order.
  • This locking section is taken immovably along its entire circumference between two along the flow path each other immediately neigh disclosed housing components and fixed.
  • the flow resistance arrangement of the known from WO 91/06830 A1 flow sensor three flaps, which in its unloaded by an air flow along the flow path rest position an annular flow passage resistance arrangement through the flow Close as far as possible and can be deflected from the rest position into the deflection position against the material and shape-related elastic restoring force.
  • the flaps collar as a leaf springs on one side from the fixing section, wherein the successive in a direction orthogonal to the flow path flaps project in opposite directions alternately from the fixing section.
  • WO 91/06830 A1 emphasizes that the central flap, which in the rest position closes a central region of the flow passage, protrudes toward the pressure detection port at an end region of the fastening section remote from the pressure detection formations, while the peripheral flaps on both sides of the central flap projecting in the opposite direction away from the pressure detection formations.
  • a disadvantage of this solution is on the one hand, the high production cost, which is required by the additional arrangement of the inner tube with a radial distance from the channel outer wall in the region of the arrangement of the flow resistance arrangement.
  • a further disadvantage is that, in particular, the coupling points of the peripheral flaps extend on the fixing section over a relatively large angle range around the flow path and the Auskragcardi the edge flaps - in contrast to the central flap - starting from their respective coupling point starting asymmetrically inclined runs that the coupling point has an almost equally large extension component in the cantilever direction as ortho gonal to this. This results in an undesirable stiffening of the edge-side flaps with respect to a operationally desired bending of the flaps about an orthogonal to the cantilever bending axis. All flaps are integrally connected to the fixing section.
  • the flow resistance arrangement comprises a plurality of identically shaped flaps, which are arranged sequentially in the circumferential direction. They are integrally connected at their radially outer edge region with a ring-shaped closed encircling fixing section.
  • the gleichgestal term flaps each have a sector shape, which tapers from radially outward to the sensor path.
  • a central portion of the well known from US 4006634 A flow resistance arrangement is formed out as a permanent annular opening. The flaps are therefore not enough to the middle of the flow channel.
  • EP 373886 A1 refers to the fact that the radial gap between the outer wall of the channel opposite, the hinge region remote edge of the flap and the channel outer wall is crucial for the measurement accuracy of the sensor at low fluid flows. The smaller the radial gap, the more accurately the sensor can detect even small fluid flows. In the above-mentioned DE 10 2010 040 287 A1 this radial gap between the joint area remote flap edge and an edge of the fixed area is defined.
  • EP 373886 A1 discloses radially opposite the flap area remote from the hinge area an axially short, circumferentially extending radial rib on the channel outer wall, which forms the hinge area remote flap edge in the rest position extends towards. This should in turn be achieved in terms of absolute low radial gap between the flap and Kanalau technology.
  • EP 373886 A1 even on the resulting conflict of objectives, points out between the lowest possible fluid flow on the one hand, as accurate as possible, on the one hand, and the simplest possible derten drainage of the fluid entrained and in the vicinity of the flow resistance arrangement accumulating liquid on the other hand.
  • the first-mentioned target requires a minimum radial gap and thus a radially highest possible radial rib, while the second-mentioned target requires the largest possible radial gap and consequently a radially as flat as possible radial rib.
  • the present invention solves this problem with a flow sensor, as described in the introduction, in that the fixing section surrounds the flow channel in the circumferential direction around the flow path by no more than 280 °.
  • the fixing section surrounds the flow channel by not more than 280 °, be available from the fixing section free peripheral portion of at least 80 ° angle extension, over which the fixing portion does not extend and consequently a movable flap edge at least one of the flaps is not opposed.
  • at least one flap of the plurality of flaps opposite the channel outer wall, without a part of the fixing portion protrudes radially into the flow channel or without the fixing portion in the sem peripheral region would establish a the flap edge radially opposite parting line.
  • the peripheral portion free of the fixing portion is a detection peripheral portion in which - albeit with axial Ab from the flow resistance arrangement - at least one Druck writtens formations, preferably all Druck restoredsformationen, located or are formed diametrically opposite.
  • the Kanalau jointwan tion in the region of the flow resistance arrangement in the circumferential direction ver ongoing radial to the flow path projecting toward radial rib on.
  • This is dispensable because of the provision of a plurality of flaps.
  • remote flap edge of each flap along the flow path is movable, so that any in the area of Strömungswiderstandsanord tion accumulating liquid at least in deflected flaps can flow resistance resistor arrangement happen.
  • the incomplete enclosure of the flaps by the securement section allows this.
  • the fixing portion is formed symmetrically with respect to a Ankopplungsab section containing all coupling points at which the plurality of flaps are connected to the fixing portion.
  • the abovementioned circumferential portion which is free of the fixing portion is preferably diametrically opposite this coupling portion for the reasons stated above.
  • the circumferential section free of the fixing section preferably extends over a larger angular range than the coupling section.
  • the flow resistance arrangement is preferably mirror-symmetrical with respect to a mirror-symmetry plane containing the flow path.
  • the fixing section the flow channel in the circumferential direction around the flow path by not more than 180 °, preferably not more than 100 ° surrounds.
  • the flow path may be a curved flow path. It is preferably a straight-line flow axis. It forms a center line of the space enclosed by the channel outer wall volume.
  • the flow path initially defines an axial direction and, starting therefrom, a radial direction orthogonal to the axial direction and a circumferential direction about the flow path.
  • the Strö flow path is thus the basis of an endogenous cylinder coordinate system of the flow sensor or the flow channel. In the less likely Fal le a curved flow path defines the tangent to the curved Strö mungsbahn at a predetermined location an axial direction at this location.
  • the pressure sensing formations may be pressure sensors - on each side of the flow resistance arrangement of at least one - which sense the pressure in the portion of the flow channel in which they are located. Since the flow sensor is preferably a disposable or disposable sensor, preferably no measuring device is provided on the sensor housing itself.
  • the Druck conductedsforma functions are therefore preferred detection channels - in turn on each side of the Strö tion resistance arrangement at least one, preferably exactly one - which each open into a portion of the flow channel. Through these detection channels of the prevailing at the location of their confluence in the flow channel fluid pressure can be transmitted along the detection channel and at the other end of the Erfas sungskanals, far from the location of the junction, are detected by at least one pressure sensor.
  • the shape variability of the flow resistance arrangement serves to provide the flow resistance arrangement with a passage opening with a variable Strö flow cross-section.
  • This passage opening is largely closed in the absence of fluid flow through the flaps and thus their effetströmbare cross-sectional area is minimal.
  • the deflection position is therefore not a defined position, but depends on the per unit time flowing through the passage opening fluid quantity.
  • the flow channel of the flow sensor of the present invention may have any cross-sectional shape and this change along the flow path.
  • At least the passage opening closable by the flaps in the flow resistance arrangement has a circular cross section and the flow channel has a circular flow cross section in the regions axially axially adjacent to the flow resistance arrangement.
  • the circular shape of the flow cross-section may be locally disturbed by the Druck writtens.
  • the shape of the through hole of the flow resistance device may be undefined because there is a permanent physical connection of the movable flaps to the fixing portion in the coupling portion. Nevertheless, the shape of the passage opening outside the coupling portion is preferably circular or partially annular.
  • flaps are before given to all coupling points of the flaps on the fixing section in a coherent angle sector located around the flow path whose angular extent not more than 60 °, preferably not more than 50 °, especially before it is no longer 45 °.
  • This is also referred to as "coupling section" circumferentially related angle sector, the more advantageous, the relative movement of the flaps to each other and the flaps rela tive to the fixing section can be provided. This applies to both the possible available degrees of freedom of movement of the individual flaps as well as to their movement or deflection from the rest position required forces that can be reduced with decreasing coupling section.
  • each flap can be designed such that, in the rest position of the channel outer wall, the edge section of a respective flap does not only move axially along the flow path when it flows, but also has a significant radial movement component in the direction of the flow path.
  • the flap edge portion shifts in the transition between the rest position and from steering position of the affected flap in the circumferential direction;
  • the axial and radial coordinates of the flap edge portion preferably change more, preferably the axial coordinate by a factor of 4 or more and the radial coordinate by a factor of 2 or more than the circumferential coordinate of the flap edge portion. This is preferably true for each of the plurality of flaps.
  • Such an advantageous degree of freedom of movement of the shape-variable flow resistance arrangement can be achieved in that at least one flap, preferably that all flaps, in its extension region in the flow channel is divided or are in a Flauptanström Scheme with - considering the non-flow-through flow sensor with the flaps in the rest position as a reference state - larger inflow area and in a connected to the main flow Anström Society Mauanström Suite with smaller inflow area.
  • the Flauptanström Stud is to achieve a possible unrestricted movement probability only indirectly via the Mauanström Scheme ver with the fixing section connected.
  • the area larger Flauptanström Scheme undergoes a larger deflecting when flowing along the flow path due to its larger inflow Force as the tributary area.
  • the slot preferably has a slot which extends from one of the channel outer wall opposite flap edge portion radially inward into the valve interior.
  • the slot may be rectilinear or / and curved and / or be angled one or more times.
  • the main flow area and the Mauanström Scheme are integrally formed contiguous.
  • the Fineanström Scheme and the fixed area are preferably integrally formed contiguous.
  • the flow resistance arrangement preferably before two or three flaps. Regardless of whether two or three flaps are provided, always two flaps asymmetrical flaps. Although these are preferably mirror-symmetrical to each other, but taken separately is asymmetrical.
  • a flap preferably before all flaps, a joint area may be provided.
  • the Ge steering range is preferably formed integrally with both the fixed area as well as with the adjoining him Mauanström Scheme.
  • a particularly preferred kinematics of the Hauptanström Schemes in the adjustment of the flap from the rest position to the deflection position is obtained by deformation of the Mauanström Kunststoffs. It is particularly preferred if concludeds least one flap, preferably if all the flaps, the Strömungswiderstandsan order in the displacement of the rest position in the deflection position about two mutually orthogonal pivot axes is pivotable or are.
  • the adjacent flow area is formed as a web longitudinally extending web portion, in which a web cross-section in a longitudinal direction orthogonal gonal cutting plane a width-to-depth ratio of between 2 and 10, preference, from between 2.5 and 8, more preferably of between 2.9 and 3.1 has.
  • a consideration in the rest position applies as the reference position. Due to the above dimensional ratios, the Kleinanström Jardin can be pivoted about a first pivot axis about the local web longitudinal direction orthogonal bending axis at flow by bending the web portion and can by ver twisting of the web portion about a local longitudinal web direction torsion about a second, to the first orthogonal pivot axis ver pivots become.
  • the web section along which the specified width-to-depth ratio applies is preferably longer than it is wide.
  • the web portion can be formed along its longitudinal extent tapered.
  • the web section tapers in the direction away from the fixing section, so that the web section as a bending and torsion section can be formed radially closer to the flow path than in the case of the channel outer wall.
  • the web portion may be angled or / and curved about an axis orthogonal to its local web longitudinal axis.
  • the Strömungswiderstandsanord tion for ease of manufacture at a well-defined repeatable deformable speed is a one-piece device.
  • the flow resistance arrangement may in principle be formed from a thin metal foil, in which case a non-rusting metal is preferred because of the load with moisture entrained by the flow.
  • Lower costs with high manufacturing accuracy can be achieved by a flow resistance arrangement formed from a plastic film.
  • PET has proved to be a particularly suitable plastic film material.
  • the plastic film has a thickness of between 20 pm and 100 pm, more preferably between 30 and 75 pm, most preferably between 40 and 60 pm.
  • Ge according to a particularly preferred embodiment, the plastic film and thus the flow resistance arrangement may have a thickness of 50 pm.
  • the thickness of the flow resistance arrangement is preferably substantially constant over its entire extension area.
  • the thickness of the plastic film forms the abovementioned depth dimension of the flow resistance arrangement.
  • the width of the above-mentioned web section is in a range between 0.15 mm and 0.3 mm.
  • the length of the web section is then preferably more than 1 mm, more preferably even more than 2 mm, in order to achieve the above-described torsion of the web section about its web longitudinal direction.
  • the channel outer wall may be formed at least over an axial portion of the flow channel to an inner tube, which is surrounded radially outside, with the interposition of a clearance gap of an outer tube. The inner tube is thus shielded from the outside environment and can heat up faster to the temperature of the fluid flowing in the flow channel.
  • the sensor housing preferably produced by injection molding can be made of any desired thermoplastic material, but preferably of a MAPS blend particularly suitable for medical applications, comprising methyl methacrylate, acrylonitrile, butadiene and styrene, or polysulfone.
  • the sensor housing may be formed at least in two parts, wherein a housing member has a recess into which the fixing portion is axially inserted, and wherein a further housing member has a stamp formation, which in the assembled state of the flow sensor on the Fixed laying section abuts axially and thereby fixed axially.
  • An edging of the recess is preferably formed at least partially complementary to the peripheral shape of the fixing section, so that the flow resistance arrangement is correctly positioned by mere arrangement of the fixing section in the recess for their further operation.
  • the sensor housing can in accordance with the configuration of the joining areas of two axially immediately adjacent Ge housing components, which hold between the Festlegeabites, an unwanted desired joint in the rest position of a flap edge of the flaps are advantageously avoided. Because such joints share between two housing construction promote the accumulation of liquid by capillary action. Therefore, it is preferable if a fixing-joining portion of maximum axial approach of the two housing components in the region of the fixing portion axially spaced from a Channel joining portion greatest axial approximation of the two housing components in the region of at least one deflectable flap edge is located.
  • the channel-joining portion which is preferably diametrically ge gen undergraduateliegt the fixing-joint section, with axial distance from the flap edges of the flaps - at Betrach tion of the rest position as the reference position - be arranged while the hard-laying section directly on the fixing section and thus axially directly may be located on the flow resistance arrangement. Since the fixing-joining section is located at the intended orientation of the flow sensor in operation in the direction of gravity force over the channel-joint section, and be preferably located at a highest portion of the flow channel, the fixed-joint section for the accumulation of liquid in the vicinity of the Flow resistance arrangement unproblematic.
  • the presently described flow sensor has due to the described flap mobility the advantageous property that it is based on the reference described above paragraph in operation with horizontally oriented flow path and with the fixing-Fügeabites or / and the pressure detection formations at the geodetically highest portion of the flow channel can be used rotated about 90 ° in both opposite directions of rotation around the flow path, without sacrificing measurement accuracy. This is due to the above-described, about two mutually orthogonal pivot axes pivotable flaps.
  • Numerous flow sensors of the prior art react very sensitively with regard to their accuracy of measurement to their rotation about the flow path from their aforementioned desired orientation. Especially in the care of artificially ventilated patients, however, there is always a deviation of the actual orientation of the flow sensor from its desired orientation.
  • the present invention presented flow sensor provides even if the actual orientation of the flow sensor differs from the target orientation to a considerable extent, reliable measurement results, thus preventing a triggering of alarms to ventilators.
  • Nursing staff who have an artificially beat- meten patients just moved and thus justified a reorientation of the flow sensor of the patient, so can devote himself to his real task, without being distracted by unnecessary alarms of a connected ventilation device and / or interrupted.
  • the present differential pressure flow sensor is preferably designed for use in artificial respiration ventilators of living beings.
  • the sensor housing therefore preferably has at its two longitudinal ends connec tion formations for connection with ventilation gas leading flow lines, such as hose and / or piping.
  • the flow sensor is used before yakt to determine the one patient per unit time or per breath delivered ten th inspiratory and / or till of this per unit time or per breath carried exhaled breathing gas.
  • the present invention therefore also relates to a ventilation device for artificial ventilation of a patient with
  • a valve assembly comprising an inspiratory valve and an expiratory valve
  • a flow sensor arrangement for the quantitative detection of a gas flow in the ventilation line arrangement, comprising at least one flow sensor,
  • a pressure sensor arrangement for the quantitative detection of a gas pressure of gas flowing in the ventilation line arrangement
  • control device which is designed to control the operation of the pressure variation arrangement on the basis of measurement signals of the flow sensor arrangement, wherein at least one flow sensor is a differential pressure flow sensor described above.
  • such ventilation devices have more than one flow sensor, namely a distal, patient-remote flow sensor and a proximal, patient-closer sensor. At least the proximal flow sensor is formed as described above.
  • the sensor housing has an inner tube defining the flow channel and an outer tube radially shielding the inner tube, they are preferably formed on the side of the Sensorge housing facing the patient in the ventilation mode since the expiratory breathing gas usually has a higher temperature than the inspiratory one.
  • the inner tube preferably begins at the ventilator in the patient facing the longitudinal end of the Sensorge housing, so that exhaled breathing gas directly upon entry into the Sen sorgephaseuse through the outer tube of the external environment shielded flows through the Strö mungskanal.
  • FIG. 1 shows a respiratory device with a flow sensor of the present
  • FIG. 2 is a perspective view of a flow sensor of the present invention
  • FIG. 3 shows a longitudinal sectional view through the flow sensor of FIG. 2 along a sectional plane which contains the flow path and central axes of pressure detection channels of the flow sensor
  • 4 shows a perspective longitudinal sectional view through the flow sensor of FIG. 2, cut along the sectional plane of FIG. 3, FIG.
  • FIG. 5 shows a perspective longitudinal sectional view through the housing component of FIG
  • Figure 6 plan views of an exemplary flow resistance arrangement with two flaps (part A) and three flaps (part B).
  • FIG. 1 an embodiment of a ventilation device according to the invention is designated generally by 10.
  • the respiratory device 10 is used in the illustrated example for the artificial respiration of a human patient 12. Only the sake of full completeness it should be noted that the ventilation device according to the invention 10 may be included as a mobile ventilation device 10 on a rollable frame 13.
  • the ventilation device 10 has a housing 14 in which - from the outside because of the opaque housing material not visible - a Druckver Sungsanord tion 16 and a control device 18 are added.
  • the pressure change arrangement 16 is constructed in a manner known per se and has a respiratory gas source 15 in the form of a pump, a compressor or a blower, which are each load-controllable and therefore not only the introduction of breathing gas in the respiratory device, but also the change of pressure serve the introduced respiratory gas.
  • the respiratory gas source 15 may alternatively be formed by a pressure vessel, which is connectable to the housing 14 of the respiratory device 10.
  • the pressure variation assembly 16, the gas source 15 and optionally to additionally - or in the case of a pressurized gas supply as a source of gas altatively - a reducing valve and the like.
  • the ventilation Device 10 in a conventional manner, an inspiratory valve 20 and a Exspira tion valve 22.
  • the controller 18 is typically realized as a computer or microprocessor. It comprises a memory device, not shown in Figure 1, to save 10 necessary for the operation of the ventilation device necessary data and erforder if necessary to call.
  • the memory device can also be located outside of the housing 14 during network operation and be connected to the control device 18 by means of a data transmission connection.
  • the REMtragungsverbin tion may be formed by a cable or a radio link.
  • the memory device is preferably integrated into the control device 18 or at least in the same housing 14 as this added.
  • the respiration device 10 has a data input 24, wel cher is represented in the example shown in Figure 1 by a keyboard.
  • the control device 18 can receive data via various data inputs, for example via a network line, a radio link and / or via input connections 26.
  • the device 10 Ventilmungsvor have an output device 28, screen in the example shown.
  • the patient 12 is connected to the pressure change arrangement 16 via a ventilation line arrangement 30.
  • the patient 12 is intubated for this purpose.
  • the ventilation line arrangement 30 has an Inspi rationsschlauch 32 outside the housing 14.
  • the inspiratory tube 32 may be interrupted and a first Inspirationsteilschlauch 34 and a second Inspirationsteilschlauch 36, between which a conditioning device 38 for targeted humidification and optionally also temperature of the patient 12 supplied fresh breathing gas can be provided.
  • the Kondition istsein device 38 may be connected to an external fluid reservoir 40, via the water for humidification or a drug, such as the Entzündungshem determination or to expand the airway, the respiratory gas can be supplied.
  • the ventilation line arrangement 30 has the expiratory valve 22 and further an expiratory tube 42, via which metabolized respiratory gas is blown out of the lungs of the patient 12 into the atmosphere.
  • the inspiration tube 32 is coupled to the inspiration valve 20, the exspira tion tube 42 with the expiratory valve 22. Of the two valves only one is open at the same time for the passage of a gas flow.
  • the actuation control of the valves 20 and 22 is also carried out by the controller 18th
  • the control device 18 is designed to repeatedly update or determine ventilation operating parameters that characterize the ventilation mode of the ventilation device 10 during the ventilation operation, in order to ensure that the ventilation mode optimally optimizes the patient 12 to be respirated at each point in time is.
  • the respiratory device 10 is connected in terms of data transmission with one or more sensors which monitor the condition of the patient and / or the operation of the respiratory device.
  • a proximal flow sensor 44 which detects the respiratory gas flow prevailing there in the ventilation line arrangement 30 in a Y-connector 45.
  • the flow sensor 44 may be coupled by means of a Sen sor-line arrangement 46 with the input terminals 26 of the controller 18.
  • the sensor line arrangement 46 may, but need not, be an include signal transmission lines. It may also have hose lines 43 which transmit the gas pressure prevailing in the flow direction on both sides of the flow sensor 44 to the input ports 26, where these are quantified by pressure sensors 27.
  • the flow sensor 44 is a differential pressure flow sensor 44th
  • a further flow sensor 47 is provided, which is characterized by its greater distance from the patient 12 as a distal flow sensor 47 be.
  • the proximal male flow sensor 44 in contrast to the distal flow sensor 47 in principle also able to detect the flow of expiratory breathing gas through the expiratory tube 42.
  • the correct function of the flow sensors 44 and 47 is wesent Lich for the correct operation of the respirator 10 and thus for the health of the patient 12.
  • the proximal flow sensor 44 is at greater risk of faults than the distal flow sensor 47 because of its proximity to the patient 12.
  • the proximal flow sensor 44, through which expiratory breathing gas also flows, is stronger than the distal flow sensor 47, for example burdened by moisture contained in the respiratory gas. This is even more the case when the distal flow sensor 47, as in the present example of FIG. 1, is arranged in the direction of inspiration upstream of the conditioning device 38 and thus essentially only dry inspiratory breathing gas flows through it.
  • FIG. 2 shows an embodiment according to the invention of the differential pressure flow sensor 44 in perspective when viewed from the outside.
  • the flow sensor 44 comprises a sensor housing 46, the two housing components 48 and 50 um- summarizes.
  • the sensor housing 46 defines a flow channel 52, which passes through the Sen sorgetude 46 along a rectilinear flow path S in the illustrated example.
  • the flow path S is therefore present a flow axis. However, this does not have to be the case.
  • the flow path S may deviate from the illustrated embodiment also have a curved course.
  • the longitudinal end region 46a of the sensor housing facing the viewer in FIG. 2 is the longitudinal end closer to the patient 12
  • the longitudinal end 46b opposite the flow path S is the longitudinal end of the sensor housing 46 farther from the patient 12.
  • the two housing components 48 and 50 have at their mutually facing longitudinal ends in each case a connecting flange 48a and 50a, which protrude respectively via a pipe section 48b and 50b of the associated housing member 48 and 50 radially outward.
  • the flanges 48 a and 50 a touch to form a parting line 54.
  • Each housing member 48 and 50 has a connection formation 48c and 50c, which serve the coupling of the hose lines 43 for connection to the pressure sensors 27.
  • the connection formations 48c and 50c are formed in the illustrated example as cylindrical connecting pieces, but may also have a belie bige different shape.
  • the connecting pieces 48c and 50c are interspersed by a respective Druckfas sungskanal 56 and 58, which extend parallel along straight channel axes K1 and K2 in the flow channel 52.
  • the pressure detection channels 56 and 58 through put so the sensor housing 46 and open into the flow channel 52, so that a pressure prevailing in the sensor channel 52 pressure via the pressure sensing channels 56 and 58 and the hose lines 43 can be transmitted to the pressure sensors 27 and detected there.
  • Figures 3 and 4 show longitudinal sections of orifices 56a and 58a of the pressure detection channels 56 and 58 at the flow channel 52 radially outwardly be adjacent Kanalau presentdung 60.
  • the mouths 56a and 58a of the Druckfas sungskanäle 56 and 58 form in the present example pressure detection formations of the flow sensor 44th which serve to detect a fluid pressure in the interior of the flow channel 52.
  • the pipe section 48b is double-walled and comprises an outer tube 62 and an inner tube 66 arranged radially inwardly with an intermediate arrangement of a spacer gap 64.
  • the channel outer wall 60 which delimits the flow channel 52 radially outward is formed exclusively in the housing component 48 on the inner tube 66.
  • the Strö mungskanal 52 in the housing member 48 is cylindrical.
  • the annular clearance gap 64 which radially separates the inner tube 66 from the outer tube 62, tapers toward the flange 48a as the wall thickness of the inner tube 66 increases in the axial direction toward the flange 48a.
  • the thickness of the outer tube 62 is constant along the flow path S.
  • Darge is set, defined on the other housing member 50, only a pipe 68, the pipe section 50 b, so that the channel outer wall 60 is formed on the radially inwardly facing side of the tube 68.
  • the channel outer wall 60 in the projecting from the flange 50a tube 68 encloses a larger cross-sectional area than the channel wall 60 in the inner tube 66.
  • a document body 70 is arranged, which as a solid body occupies a volume of space in the pipe 68, so that the actually effetströmbare Cross-sectional area in this area is smaller than the area enclosed by the Kanalau towandung 60 area.
  • flow resistance arrangement 72 which in Figure 3 in its rest position, ie unloaded by a fluid flow in the flow channel 52 as a planar structure with an extension plane orthogonal to Flow path S and orthogonal to the drawing plane of Figure 3 runs.
  • flow resistance arrangement 72 has a fixing portion 72 a, which is clamped in the parting line 54 between the housin parts 48 and 50, and has a flow channel 52 angeord Neten, integral with the fixing portion 72 a related Klappenab cut 72 b.
  • the flap portion 72 b When flowing through the flow channel 52, no matter in which direction, the flap portion 72 b is deflected relative to the fixed housing portion 72 a, thereby reducing the covered by the flap portion 72 b or cross-sectional area of the flow channel 52 decreases with increasing deflection, whereby the flow-through in the flow resistance arrangement 72 Cross-sectional area of the flow channel 52 is increased.
  • the flow resistance arrangement 72 acts like a throttle in the flow channel 52, so that different fluid pressures form in the flowing fluid 52 upstream and downstream of the flap section 72b, which also occur in the pressure sensing channels 56 via the mouths 56a, 58a and 58 and thus in the subsequent to these sequent hose lines 53 can be detected.
  • the pressure sensors 27 can thus detect a pressure difference in the flow channel 52 upstream and downstream of the flow resistance arrangement 72 and determine the fluid flow through the flow sensor 44 along the flow path S in accordance with a previously performed cal calibration of the flow sensor 44 from the pressure difference upstream and downstream of the flow resistance arrangement 72 , The Operation of such a differential pressure flow sensor 44 is known per se.
  • the flow resistance arrangement 72 is located in the flow channel 52 in a first axial region 74, which extends axially on both sides of the flow resistance arrangement 72 and along which a bordered by the Kanalau towandung 60 cross-sectional area is approximately constant in magnitude and preferably also GE stalt matter constant.
  • an outer -Transienz-axial region 78 is between the first axial region 74 and the second axial region 76, in which the channel outer wall 60 as it progresses along the flow path S from the smaller cross section of the first axial region 74 to the larger cross section of the second axial region 76 grad Lich, preferably linear changes.
  • the pressure sensing channel 58 of the housing member 50 opens into the outer-Transience-axial area 78.
  • the first Axial Scheme 74 axially over the Mün tion 58 a of the pressure sensing channel 58 also be extended, so that the two mouths 56 a and 58 a of the pressure detection channels 56th and 58 substantially open into an identical flow channel section.
  • the document body 70 is connected via a plurality of webs 80 in the region of its flow resistance arrangement 72 closer longitudinal end with the flange 50 a and / or with the tube 68 of the housing member 50.
  • the document body 70 is cantilevered by the webs 80, that is away from the webs 80 in the axial direction of the remaining document body 70 without further connection with the umge bender tube 68 so that the flow channel 52 in the radial webs 80 free portion of the second axial region 76 surrounds the document body 70 in the circumferential direction.
  • the webs 80 enforce the between the document body 70 and the channel outer wall 60 formed in the tube 68 radial gap 82, depending on their location, in the radial and / or axial direction.
  • the document body 70 has in its cantilevered portion a rotationssym metric shape, in the example shown a cylindrical shape with a smooth, the flow channel 52 rapender outer surface.
  • the document body 70 At its flow resistance arrangement 72 closer longitudinal end of the document body is fluidically with the least possible flow resistance was formed in the flow from the direction of the first axial region 74, such as ball or Ellipsoidkalotte.
  • the document body 70 therefore has an inner transiency axial region 79 on the longitudinal end closest to the flow resistance arrangement 72, along which the cross-sectional area closed by the document body 70 changes.
  • the cross sectional area located in the second axial region 76 which is closed by the slip body 70 and thus no longer available for fluid flow, is constant in the axial direction.
  • the webs 80 even if they are integrally formed by injection molding with the document body 70, remain outside in the consideration of the space enclosed by the document body 70 Senen volume.
  • the webs 80 are not part of the document body 70, but only its attachment formations.
  • the document body 70 advantageously reduces the dead space in the interior of the flow sensor 44.
  • the document body 70 in the artificial respiration ventilation device 10, of which the flow sensor 44 is preferably a component reduces the gas volume that does not participate in the pulmonary gas exchange is. This is all the more advantageous, the lower the volume of gas exchanged per breath is pulmonary.
  • the artificial respiration of infants and toddlers requires only a small tidal volume. As can be seen in FIG.
  • the outer transience axial region 78 and the inner transience axial region 79 overlap axially in order to realize a change in the shape of the flow channel 52 in as short an axial space as possible in return for as long as possible axial stretching be able to train with constant flow channel 52 in the flow sensor 44.
  • FIG. 3 shows the flow sensor 44 in its ideal arrangement during operation of the respiratory device 10, namely with horizontal flow path S and channel axes K1 and K2 running parallel to the direction of gravity g, so that the mouths 56a and 58a of the pressure detection channels 56 and 58 at a geodetically highest location of the flow channel 52 open into this.
  • Moisture or liquid entrained by the fluid flowing through the flow sensor 44 which possibly precipitates on the channel outer wall 60, then flows away from the mouths 56a and 58a in a gravity-driven manner and does not disturb them.
  • droplets entrained by the fluid flowing through the flow sensor 44 can land on the flap section 72b and adhere there wettingly.
  • the outer-transience axial region 78 here, assuming ideal operating moderate arrangement, as shown in Figure 3, a gradient along which liquid flows from the first axial region 74 gravity driven into the second axial region 76. In the second axial region 76, liquid can no longer disturb the flow resistance arrangement 72.
  • the Abriosnuten 84 extend in the housing member 50 of the parting line 54 in the axial direction along the channel outer wall 60 continuously at the Strö mungswiderstandsan extract 72 over.
  • the parting line 54 is located at least in the ge from the fixing portion 72 a and / or from the mouths 56 a and 58 a remote area lying channel outside wall 60 advantageously axially from the flow resistance arrangement 72, in particular of the flap portion 72 b, away, so that at least from the fixing portion 72 a or / And from the mouths 56 a and 58 a remote radially outer edge portions of the flaps of the Strö tion resistance arrangement 72 are arranged in the rest position of the parting line 54 away.
  • Dashed line in Fig. 3 an alternative course of the parting line is denoted by 54 '.
  • the parting line 54 ' can also extend on the side of the flow resistance arrangement 72, on which the document body 70 is located.
  • the first axial region 74 can thus be completely in Housing member 48 may be formed.
  • Helpful against unwanted accumulation of liquid in the area of the flow resistance arrangement 72 is when a lying away from the fixing portion 72 a and / or of the mouths 56 a and 58 a lying edge portion of the flap portion 72 b in the rest position no separation fugue 54 or 54 ', but only a portion of Kanalau jointdung 60 radially opposite.
  • the Abriosnuten 84 in the second axial region 76 may have a larger circumferential dimension (width) than in the first axial region 74 and / or
  • the intermediate formations 86 may have a larger circumferential dimension (width) between two circumferentially adjacent evacuation grooves 84.
  • Figure 5 shows a perspective longitudinal sectional view of the housing member 50 without flow resistance arrangement 72.
  • a preferred shape of the Ab is grooves 84 and, above all, in the circumferential direction between these initiallybil Deten intermediate formations 86 shown.
  • intermediate formations 86 have, in their circumferential center, a ridge line 86a or a ridge region 86a, which is the section of an intermediate formation 86 which is closest to the flow path S passing through the flow channel 52 centrally. Subsequently, the intermediate formation 86 will be described on the basis of a line-like ridge line 86a instead of an equally possible flat ridge area. Starting from the ridge line 86a increases on both sides of the ridge line 86a in the circumferential direction of the radial distance of the channel outer wall 60 of the Strö flow path S at.
  • the ridge line 86a defines a kink axis about which the two flat surfaces to each other from the Strö immigration path S are angled away.
  • the AbGermannuten 84 between two intermediate formations 86 have an open to the flow axis S rectangular cross-section, ie the Abtechnologynuten 84 are by three planar boundary surfaces, of which each Weil two adjacent boundary surfaces together form a right angle.
  • the AbGermannuten 84 can also be in the radial direction taper away from the flow axis S, ie the Abtechnologynuten 84 in the circumferential direction Rich limiting surfaces may be inclined towards each other in the direction of the flow axis S away.
  • the ridge line 86a acts as an effective overflow barrier, which prevents liquid speed from flowing over a discharge groove 84 in the circumferential direction in an adjacent Abtechnologynut 84.
  • the grooves in the first and in the second axial region 74 and 76 extend with a groove base 84a which is parallel to the flow path.
  • the groove bottom 84a of one or more Abtechnologynuten 84 may have a further slope in a longitudinal section, similar to the outer transience Axial Scheme 78 and thus the groove reasons in this area 78 provide a slope, so that in the Abtechnologynuten 84 accumulating liquid gravity driven over this Gradient can be further led away from the flow resistance arrangement 72 or even can be discharged from the sensor housing 46.
  • the longitudinal portion in which the groove bottom 84a tilts away from the flow path S as it progresses to a longitudinal end of the sensor housing 46 preferably an end portion containing the patient distal end 46 b of the sensor housing 46.
  • this end region extends over not more than half, preferably over not more than 25% of the second axial region 76th
  • All axial grooves 84 in the second axial region 76 may have this further gradient obliquely or only part of the discharge grooves 84 may have the gradient obliquely. Since the further downward slope for a liquid discharge therein is angewie sen on their correct orientation relative to the direction of gravity, the part of Ab technologicalnuten should be provided with the further inclination in a To catch portion of the flow channel 54, which contains the geodetically deepest portion of the same. In FIGS. 3 and 4, this region lies diametrically opposite the orifices 56a and 58a of the pressure-detecting channels. In Figure 5 is also a rectangular recess 88 on the housing part 48 facing the longitudinal end of the housing member 50 can be seen. This right-angled recess 88 serves to receive the substantially complementary configured fixing section 72a of the flow resistance arrangement 72.
  • the fixing portion 72a is bounded such that it rests substantially free of play on the edge of the recess 88, so that the position of the Strömungswiderstandsanord tion 72 and especially of the flap portion 72b in the flow channel 52 is clearly defined.
  • the flow channel 52 in the housing member 48 is present with smooth channel outer wall 60 is formed.
  • the Abtechnologynuten may also be continued in this area of the flow channel 52 and continuously extending from a location in the housing member 48 continuously axially on the flow resistance arrangement 72 past in the second axial region 76, preferably extend to the longitudinal end 46b of the sensor housing.
  • FIGS. 6A and 6B show advantageous exemplary embodiments of advantageous flow resistance arrangements 72 of a flow sensor 44 according to the invention.
  • FIG. 6A 72 ' is a modified embodiment to the presented in Figure 4 Darge flow resistance arrangement 72 is shown. Same and functionally identical components and component sections as in FIGS. 1 to 4 bear the same reference numerals, but apostrophes.
  • the flow resistance arrangement 72 'of FIG. 6A has a rectangular fixing section 72a', which is designed to be complementary to the recess 88 in the housing component 50.
  • the flap portion 72b ' has two flaps 90a' and 90b '.
  • Both the fixing portion 72a 'and the flap portion 72b' are mirror symmetrical with respect to a mirror symmetry plane SE, which in the illustrated example runs exactly between the two flaps 90a 'and 90b'.
  • a mirror symmetry plane SE which in the illustrated example runs exactly between the two flaps 90a 'and 90b'.
  • the flap 90a ' whose part-circular flap edge 90a1' in the flow sensor 44 of Abzhounuten 84 provided Kanalau towandung 60 radially opposite, delimits a Flauptanströmabêt 90a2 ', which is integrally connected via a web-shaped Crowanströmabrough 90a3' with the fixing portion 72a '.
  • the flap portion 72b ' is fed at the onset of fluid flow in the flow channel 52 orthogonal to the plane of the figure 6A. Due to its significantly larger area, a greater fluidic force acts on the main flow area 90a2 'than on the secondary inflow area 90a3'.
  • the Crowanström Society 90a3 ' which is bent about an orthogonal to the flow path S bending axis KA, is twisted about two torsion axes Ta T and Ta2', which coincide with the longitudinal web directions SLaT and SLa2 'of the two legs on the other hand, the buckling axis KA of the Fineanströmabitess 90a3'.
  • each of the two limbs on either side of the bending axis KA of the secondary flow area 90a3 ' is situated around a plane in the drawing plane of FIG. transverse torsion axis TaT or Ta2 'orthogonal bending axis bendable. The sake of clarity, the two bending axes are not shown.
  • the two Summenverfor tion axes T 'and B' are the sake of clarity for the mirror-symmetric flap 90b 'registered as summation deformation axes Tb' and Bb '.
  • the two summation deformation axes Bb 'and Tb' thus form two linearly independent pivot axes about which the main inflow region 90a2 'is movable relative to the fixing section 72a'.
  • the coupling points AT and A2 ', to which the flaps are connected by means of Mauan- ström Schemee 90a3' and 90b3 'with the fixing portion 72a' lie gene with respect to the flow path S in a contiguous angle sector 92 ', which in the example shown about not more extends as 20 °.
  • the two flaps 90a 'and 90b' in particular their Flauptanström Schemee 90a2 'and 90b2' relative to the fixing portion 72a 'already movable by low flow, the mobility around the two summation axes T' and B 'a magnitude large change in the Flow resistance arrangement 72 'allows existing flow-through cross-sectional area.
  • FIG. 6B shows an alternative embodiment of a flow resistance arrangement 72 ", whose flap section 72b" has three flaps 90a “, 90b” and 90c ".
  • the two edge flaps 90a “and 90b” are mirror symmetrical to each other with respect to the mirror symmetry plane SE, while the third central flap 90c “located between these flank flaps 90a” and 90b “is mirror-symmetrical in itself to the plane SE
  • the description of the flap 90a is “due to the symmetry condition on the flap 90b” application of 90a "and 90b” in itself asymmetric. bar.
  • the Mauanström Society 90a3 "tapers first, starting from the coupling to point A1" and then goes into a web section with constant Boothnab measurements over.
  • the Mauanströmabrough 90a3 is twisted about a torsion axis Ta" and is bendable about a bending axis B "The bending axis B" is for all Mauanströmabroughe 90a3 ", 90b3” and 90c3 “approximately a common collinear bending axis B".
  • the torsion axes of the individual web portions are orthogonal to each other and parallel to the bending axis B "Only the axes Ta" and Tc "of the torsion axes are indicated in Fig. 6B
  • the missing axis Tb" results from the axis Ta "by said mirror symmetry condition.
  • the central flap 90c is basically twistable, but will not be deformed about the torsion axis T2" due to its generally symmetrical flow.
  • the fan-shaped central flap 90c will therefore deform predominantly by bending about the bending axis B".
  • the edge-side flaps 90a "and 90b" are not only theoretically pivotable about two mutually orthogonal pivot axes Ta “and Tb” and B ", but will actually perform this pivotal movement due to their asymmetrical arrangement with respect to the flow path S in the breathing operation can be effected at low Ver deformation of the flap portion 72 b 'a relatively large change in the flow-through cross-sectional area of the flow resistance arrangement 72 ".
  • the angle sector 92 "in the embodiment of Figure 6B is larger than the sector 92 'in Figure 6A, but does not exceed 45 °. Only for the sake of completeness, it should be noted that in FIGS. 6A and 6B, identical and functionally identical components or component sections are designated by the same reference numerals, but with different numbers of apostrophes.
  • the partial separation of the Hauptanströmabête from the Mauanström- sections of the same flap, as well as a separation of the flaps with each other, is effected by slitting the material of the flow resistance arrangement.
  • the slit width is smaller than the width of web-shaped sections of the sub-slit regions.

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  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
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  • Biomedical Technology (AREA)
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  • Biophysics (AREA)
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  • Engineering & Computer Science (AREA)
  • Physiology (AREA)
  • Heart & Thoracic Surgery (AREA)
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Abstract

L'invention concerne un capteur de débit par pression différentielle (44) qui comprend - un boîtier de capteur (46), lequel définit un canal d'écoulement (52) introduit dans le boîtier de capteur (46) qui peut être traversé par un fluide le long d'une voie d'écoulement (S), - un agencement de résistance (72 ; 72' ; 72") à l'écoulement dans le canal d'écoulement (52) et - des formations de détection de pression (56a, 58a) agencées axialement de part et d'autre de l'agencement de résistance (72 ; 72' ; 72") à l'écoulement, l'agencement de résistance (72) à l'écoulement comportant : - une section de fixation (72a) agencée à l'extérieur du canal d'écoulement (52), laquelle sert à la fixation de l'agencement de résistance (72) à l'écoulement au niveau du boîtier de capteur (46), et - une pluralité d'abattants mobiles les uns par rapport aux autres agencés à l'intérieur du canal d'écoulement (52), lesquels sont mobiles par rapport à la section de fixation entre une position de repos non chargée et une position de déviation déviée par l'application extérieure d'une force en raison de l'écoulement de fluide le long de la voie d'écoulement (S). Selon l'invention, la section de fixation (72a) du canal d'écoulement (52) n'entoure pas la voie d'écoulement (S) de plus de 280° dans la direction circonférentielle.
PCT/EP2019/057335 2018-03-28 2019-03-22 Capteur de débit par pression différentielle pour dispositifs respiratoires à résistance à l'écoulement améliorée à abattant en plusieurs parties Ceased WO2019185492A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018204799.5 2018-03-28
DE102018204799.5A DE102018204799A1 (de) 2018-03-28 2018-03-28 Differenzdruck-Durchflusssensor für Beatmungsvorrichtungen mit verbessertem Strömungswiderstand mit mehrteiliger Klappe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021124785A1 (de) 2021-09-24 2023-03-30 Hamilton Medical Ag Durchflusssensor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989037A (en) * 1970-06-23 1976-11-02 Siemens Aktiengesellschaft Flow measuring device
US4006634A (en) 1975-09-17 1977-02-08 National Semiconductor Corporation Flow meter
EP0373886A1 (fr) 1988-12-16 1990-06-20 Bird Products Corporation Débitmètre à orifice variable
WO1991006830A1 (fr) 1989-11-06 1991-05-16 Bicore Monitoring Systems Debitmetre a gaz avec obstruction de section de passage variable
DE102010040287A1 (de) 2009-09-07 2011-03-17 Hamilton Medical Ag Durchflussmessfühler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3989037A (en) * 1970-06-23 1976-11-02 Siemens Aktiengesellschaft Flow measuring device
US4006634A (en) 1975-09-17 1977-02-08 National Semiconductor Corporation Flow meter
EP0373886A1 (fr) 1988-12-16 1990-06-20 Bird Products Corporation Débitmètre à orifice variable
WO1991006830A1 (fr) 1989-11-06 1991-05-16 Bicore Monitoring Systems Debitmetre a gaz avec obstruction de section de passage variable
DE102010040287A1 (de) 2009-09-07 2011-03-17 Hamilton Medical Ag Durchflussmessfühler

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