EP3384262A2 - Drucksensor, messmatratze, liegestatt, verfahren und diagnosesystem - Google Patents
Drucksensor, messmatratze, liegestatt, verfahren und diagnosesystemInfo
- Publication number
- EP3384262A2 EP3384262A2 EP16805808.9A EP16805808A EP3384262A2 EP 3384262 A2 EP3384262 A2 EP 3384262A2 EP 16805808 A EP16805808 A EP 16805808A EP 3384262 A2 EP3384262 A2 EP 3384262A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- pressure
- pressure sensor
- optical fiber
- mattress
- 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.)
- Withdrawn
Links
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
- A61B5/1116—Determining posture transitions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/4806—Sleep evaluation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
- A61B5/6892—Mats
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0261—Strain gauges
- A61B2562/0266—Optical strain gauges
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/04—Arrangements of multiple sensors of the same type
- A61B2562/046—Arrangements of multiple sensors of the same type in a matrix array
Definitions
- a first optical fiber supplies light from an external light source to the sensor space, and a second optical fiber intercepts reflected light in the sensor space and conducts it to an external control unit.
- a pressure sensor emerges, in each of which one end of two light guides is arranged. These ends are arranged opposite each other so that light emerging from one optical fiber is picked up and transmitted by the other optical fiber. Between the two ends of the optical fibers are arranged at a fixed distance, which forms a light path. In this light path, a dark sliding element is inserted, which is spring-loaded.
- the sliding element is connected to an outwardly facing pressure body, so that by applying a compressive force on the pressure body, the sliding element against the spring action, the spring element is actuated and the light path between the two ends of the Fiber optic shields. Based on the amount of light transmitted via this light path, the pressure force acting on this pressure sensor can be detected.
- the invention is therefore based on the object to provide an improved optical pressure sensor based on optical fibers, which at least partially eliminates the disadvantages of the prior art.
- the object is to provide an optical fiber-based pressure sensor that enables a more secure detection of a small load.
- an optical pressure sensor comprising: A first light guide path and a second light guide path wherein a light exit surface of the first light guide path and a light entry surface of the second light guide path are arranged such that a light supplied via the first light guide path and emerging from the light exit surface of the first light guide path falls into the light entry surface of the second light guide path,
- first surface and a second surface which are arranged opposite one another and are movable relative to one another and whose distance from one another determines a light running path between the light exit surface of the first light guide path and the light entry surface of the second light guide path,
- first surface and the second surface are mechanically coupled to each other by means of a spring element such that upon increasing a pressure force received by the pressure sensor, the first surface and the second surface move away from each other such that the light intensity entering the light entry surface changes correspondingly is converted by means of a light sensor element into an electrical signal that corresponds to the measured pressure.
- a compressive force is a compressive force.
- a pressure sensor is a force sensor for sensing a compressive force.
- the removal of the first and the second surface can also be understood as a deflection of the pressure sensor.
- the detection range is not limited by the abutment of the surfaces but only by the physical size of the sensor , The detection range of the sensor can therefore be greater.
- the light path becomes longer as the pressing force increases, and therefore, the light intensity of the returning light decreases as the pressing force increases, that is, the returning light becomes darker as the load increases.
- a maximum transmissible light intensity can be used with a minimum possible light path as a reference for calibration of the sensors. Since, according to the invention, the first surface and the second surface are coupled to one another in such a way that the first surface and the second surface move away from each other when the pressure force is increased, the transmitted light quantity decreases with increasing distance. It has been found that such a pressure sensor can detect small pressure forces very precisely and, moreover, the light intensity can be set to a maximum when the sensor is not deflected, so that the light intensity available from a light source can be optimally utilized over a large measuring range.
- the optical scanning can take place by means of a punctiform sensor which detects only a partial region of the light beam transmitted by the optical waveguide, since the brightness over the entire cross section of the optical waveguide is substantially constant in the pressure sensor according to the invention.
- a punctiform sensor which detects only a partial region of the light beam transmitted by the optical waveguide, since the brightness over the entire cross section of the optical waveguide is substantially constant in the pressure sensor according to the invention.
- a region is shielded, so that there is a dark and a light section in the optical waveguide arranged downstream of the shielding element.
- an additional element must be provided which mixes the light of the two sections in order to obtain a reliable measured value or an optical sensor must be used, the detection surface is so large that it integrates the light over the entire cross section of the light guide.
- a triggering threshold for the sensor can also be defined so that fluctuations in zero position can be effectively suppressed.
- the first optical fiber path is a first optical fiber, which is accommodated in a first surface having the component
- the second optical fiber is a second optical fiber, which is accommodated in a second surface having the component
- the light exit surface of the first light guide with the first surface may preferably be coplanar or substantially coplanar
- the light entry surface of the second light guide may be coplanar or substantially coplanar with the second surface.
- the light guides mentioned in the preceding embodiments can be understood as optical waveguides, which are constructed in particular from optical fibers.
- the coupling of the first and second surfaces can also be realized particularly easily.
- the optical pressure sensor may have a spring element which is arranged such that the spring element counteracts the pressure force to be measured.
- the spring element can be used as part of a Be formed housing of the pressure sensor.
- the spring element may also be a separate component, such as a helical compression spring.
- the elastic spring element for example the mattress
- the elastic spring element can form the spring element, in which case the pressure sensor has sections which interact with corresponding sections of the mattress in such a way the spring action of the elastic element is transmitted to the pressure sensor.
- the pressure sensor preferably has two holding elements, wherein one of the two holding elements forms the first surface and the other holding element forms the second surface.
- the two holding elements are arranged so as to be movable relative to one another in a direction approximately perpendicular to the two surfaces, so that they are moved away from one another when a pressure is applied.
- the two holding elements may be designed such that they engage in a form-fitting manner in such a way that they are displaceable relative to one another in an axial direction.
- Such a positive engagement can be realized, for example, by a hollow cylindrical retaining element and another, cylindrical retaining element, which is arranged with little play displaceable in the hollow cylindrical retaining element.
- An end face of the cylindrical holding element forms one of the two first or second surfaces and an end wall of the hollow cylindrical holding element forms the other of the two first second surfaces.
- the two holding elements can each be coupled to a pressure body.
- the pressure body is preferably designed as a pressure plate.
- the pressure bodies each form a free end surface of the pressure sensor, so that by compressing the pressure body, the holding elements are moved relative to each other and the first surface and the second surface are moved away from each other.
- the holding elements are preferably connected to at least one spacer element with the respective pressure body.
- the spacers are arranged eccentrically to a central axis of movement.
- the spacer elements of the different holding elements are arranged offset from each other in the direction of rotation about the axis of movement.
- a measuring mattress for detecting states of a body located on the measuring mattress comprising:
- a quality of light is understood to mean, in particular, a light intensity.
- a frequency spectrum, a light output, or other characteristics of the light used may be used.
- Cavities can be, for example, existing barrel spring cores of the mattress anyway. Alternatively, the cavities may also be specially incorporated into the mattress. The cavities may be formed to elastically close when not occupied by a pressure sensor or the like.
- the measuring mattress may also have a microphone accommodated in a cavity, which preferably operates on the basis of light guides.
- sound recordings can also be made, for example, for monitoring respiration, pulse or for recording calls for help or other voice messages.
- the measuring mattress has a plurality of channels formed in the measuring mattress for receiving optical fibers to and from the cavities.
- the measuring mattress can be designed as an inner layer, support or pad of a lying mattress.
- the mattress is formed into a plurality of separate sections, which can be tilted, for example, by means of a tilt function. It is known to tilt the area of the upper body of a mattress. It is also known to raise in the leg area the mattress in a triangular cross-section to support the knee.
- the individual segments of a mattress, which are formed tiltable relative to other segments, may each be provided with a separate set of pressure sensors. Within such a segment, the pressure sensors may be arranged in a regular grid. As a neighboring segment, the detent may be interrupted, i. H. that the segments are at a greater distance than the grid spacing within a segment can be formed.
- a bed with a measuring mattress as described above.
- the bed can for example be a conventional bed, a hospital bed, a nursing bed, or an operating table.
- a method for detecting states of a lying on a Stanfordstatt body by means of a plurality of subordinate half of the body arranged pressure sensors proposed.
- the pressure sensors are preferably designed according to the above description. The method comprises the steps:
- a diagnostic system comprising a plurality of pressure sensors as described above and a control system is provided. proposed unit for controlling the pressure sensors and for processing detection results of the pressure sensors.
- FIG. 1 is a schematic representation of a diagnostic system according to an embodiment of the present invention.
- microphones 48 are also arranged, which, in addition to allowing the determination of a position of a person resting on the bed 4, can detect sound signals for detecting respiratory sounds, heart sounds and / or cries for help from the person.
- the microphones 48 may be designed as optical fiber microphones.
- the control unit 6 is assigned to the bed 4 or the matrix of the sensors 42 of the mattress 40 individually. More precisely, if several beds 4 are provided, each bed 4 is assigned its own control unit 6.
- the control unit 6 comprises a processor unit 60, a power supply 62, a plurality of external interfaces 64, a light source 65, a light source. sungsech 66 and a memory unit 68, which interconnects in a conventional manner known per se, ie, technically (in terms of a data line) and energy technology (in terms of a power supply) are connected to each other in a suitable manner.
- the power supply unit 62 is provided to supply the further elements of the control unit 6 with a supply voltage.
- the external interfaces 69 enable data exchange with external units.
- the light source 65 is connected to the incoming sub-string 461 of the optical fiber bus 46, and the light detection unit 66 is connected to the outgoing sub-string 462 of the optical fiber bus 46.
- the light source 65 is formed in a conventional manner known per se in order to initiate a light of defined luminous intensity for each optical waveguide of the input sub-string 461.
- the light source 65 may be composed of laser, LED or other lighting elements, in particular arranged in a matrix.
- the light source 65 may also include an analog light source whose light is scanned over a grating or the like.
- the light source 65 is in particular designed to supply a light of defined, preferably identical, quality to each optical waveguide of the input sub-string 461, that is to say to the incoming optical waveguide of each sensor 42.
- the control unit 6 has a power supply and electrically active components. However, the control unit 6 can be placed at a safe distance from the bed 4, and the parts installed in the mattress 40 (sensors 42, pairs of light conductors 44, microphones 48) are de-energized, so that there is a risk of electrical currents from resting on the bed 4 Person can be avoided.
- the evaluation unit 8 has, as shown in FIG. 1, a housing 80, a processor unit 81, input interfaces for data records 82, interfaces for external access 83, monitor interfaces 84, interfaces for a bidirectional interactive system 85 and interfaces for external data exchange 86.
- the processor unit 81 has visualization units 812, Data management units 814, data storage units 816 and data transfer units 818.
- the input interface for data records 82 is designed to receive data records of a plurality of control units, such as the control unit 6. With the help of the evaluation unit 8, the data sets from the control unit 6, for example, converted into a body or mattress model, visualized and displayed on a monitor.
- the diagnostic system 2 described above may also be referred to as an optical fiber measuring system.
- the diagnostic system 2 can be designed or used for measuring the penetration depth of objects in elastic bodies, for the three-dimensional representation of the object.
- the diagnostic system 2 used on the mattress 40 can be designed or used to represent the movement and vital functions of a person and / or object.
- the diagnostic system 2 forms an arrangement of measuring points for measuring the penetration depth of a person and / or object into a deformable surface or into a deformable object.
- the measuring points are arranged so that a calculation and representation of the penetration depth within the arrangement on which the object to be measured is located, can take place.
- the penetration depth is measured with the help of optical fibers.
- the deflection and / or the distance of optical fibers is realized by means of a mechanical deflection, which is linked to the penetration depth.
- the measurement of the change in the light takes place with a sensor system based on a photoelectric principle or with a camera. Digitization is done by the camera or an A / D converter.
- a multi-dimensional mapping of the surface to be measured and / or of the deformed elastic object with the aid of the measured data is possible.
- a free image and / or the representation of a sectional image of the deformation of the deformed object by means of the measured data in different directions is possible.
- the measurements can be carried out at any time and / or continuously.
- a sequence of changes and / or measurements may be displayed in real time and / or as a time-varying representation in a movie, video clip, animation or similar medium on one or more screens.
- the three-dimensional animated object is calculated from the measured data and / or arises from a database with calculated data and / or input data of the dimensions of the object and / or from image recordings of the object and / or a 3D scan of the object. The simultaneous use of all input and calculation data is used for presentation.
- Analysis options from the time sequence of the presentation of the 3D animated object include, for example, stop function, time-lapse function, rotation about different axes, display of object details from other data generated in 3D, display of detail images and sequences from medical-technical admission procedures and / or other admission procedures.
- the diagnostic system can also have active elements that can be actively controlled in compensation for a movement of the object determined using the measurement data. This makes it possible to control and actively change the penetration depth of the object with the aid of the measured data.
- suitable microphones in particular optical fiber microphones, or additional devices, which also provide the data in real time via an interface, a simultaneous recording and real-time link to the measured pressure data of life functions such as pulse, respiratory function, heart rhythm, temperature is possible.
- the diagnostic system 2 is particularly suitable for medical use in hospital and geriatric care, for general diagnostic applications, for monitoring in the intensive care unit, monitoring a patient on an operating table and the like.
- FIGS. 5A and 5B each show a schematic longitudinal sectional view of the sensor along a sectional plane indicated in FIG. 2A or 2B by arrows V, V in the direction of the arrows V, V, in each case in the unloaded or loaded state.
- the light guide holder holding the first light guide 44-1 as the first light guide holder 426-1 and the light guide holder holding the second light guide 44-2 are referred to as the second light guide holder 426-2.
- the optical fiber holders 426-1, 426-2 are mounted in the carrier 424 so that they are relatively movable relative to each other and to the carrier 424.
- the spring elements 422 engage the top and bottom of the light guide holders 426-1, 426-2 and squeeze them together. As shown in Figs.
- the optical fiber holders 426-1, 426-2 each have an approximately parallelepiped base body 4261 with six surfaces, the two surfaces connected to the spring elements 422 being referred to as main surfaces and as upper and lower surfaces, respectively two surfaces whose surface normal coincide with axes of the light guides 44-1 and 44-2, are referred to as end surfaces and the remaining two surfaces are referred to as side surfaces.
- the main surfaces and end surfaces and side surfaces are substantially planar.
- the mutually facing end faces of the two optical fiber holders 426-1, 426-2 are referred to below as the inner end faces, the facing away from each other end faces of the two optical fiber holder 426-1, 426-2 as outer faces.
- the optical fiber holders 426-1, 426-2 each have a cylindrical pin 4263 which protrudes from a respective inner end face of the main body 4261, wherein a diameter of the pin 4263 is smaller than each length of the end face (width, height of the main body).
- the carrier 424 has an approximately rotationally symmetrical, plate-shaped base body 4242 and two of its opposite surfaces coaxially projecting hubs 4244 on.
- the hubs 4244 transition from a base connected to the base body 4242 into a cylindrical end portion, wherein a diameter of the end portion approximately corresponds to a smallest length of the inner end face (ie the height) of the main body 4261 of the optical fiber holder 426-1, 426-2.
- Figs. 2A, 3A, 4A, 5A the sensor 42 in the unloaded state
- the Fign. 2B, 3B, 4B, 5B show the sensor 42 in the same view in the loaded state.
- the loaded state is defined by acting on the spring members 422 a compressive force (compressive force) F from above and below.
- the end faces of the light guides 44 - 1, 44 - 2 are in close contact, so that a light supplied by the incoming light guide 44 - 1 is introduced into the outgoing light guide 44 - 2 virtually without any loss.
- the optical fiber holders 426-1, 426-2 become, as clearly shown in FIG. 5B, by the spring members 422 pressed away from each other, and the end faces 10, 20 of the pins 4263 of the optical fiber holder 426-1, 426-2 are removed from each other. This creates a gap with a gap distance s.
- This pressure sensor 42 has a first pressure element 100, a first holding element 101, a second pressure element 102 and a second holding element 103.
- the first pressure-body element 100 is formed from a pressure plate 104, which is circular in plan view, and two rod-shaped spacer elements 105.
- the rod-shaped spacer elements 105 are perpendicular to the first pressure plate 104 and are adjacent to the edge region of the first pressure plate 104 diametrically opposite on a diameter line through the circular in plan view, the first pressure plate 104.
- In the center of the first pressure plate 104 is a tubular guide portion 106 which is shorter compared to the spacers 105.
- the tubular guide portion 106 is open at its free, facing away from the first pressure plate 104 end.
- the first holding element 101 has a holding web 107 which extends between the two free ends of the spacers 105 and is fixedly connected thereto.
- a retaining pin 108 is centrally provided on the retaining bar 107 (FIG. 7), which extends from the retaining bar 107 in the direction of the first pressure plate 104 and runs parallel to the spacer elements 105.
- the retaining pin 108 has a thin central through hole or axial bore for receiving a first light guide 44-1.
- the retaining pin forms, with its free end facing the first pressure plate 104, the first surface 10 on which the end of the first light guide 44-1 is arranged in alignment.
- the second holding element 103 is inserted with its guide bush 1 12 in the guide portion 106 of the first pressure element 100.
- This pressure sensor 42 can thus be manufactured very inexpensively.
- FIGS. 10A and 10B show a top view of a measuring mattress 40 with a plurality of pressure sensors 42 arranged in a regular grid.
- the measuring mattress is formed from a plurality of layers. One or more of these layers are arranged in the region between the first pressure plate 104 and the second pressure plate 109 of the pressure sensor 42 and act as spring elements, which elastically keep the first pressure plate 104 and the second pressure plate 109 at a distance and thus in the unloaded state, the first surface 10th and compress the second surface 20.
- a pressure load is compressed with this measuring mattress and thus the pressure sensor, whereby the first surface 10 is moved away from the second surface 20.
- first pressure plate 104 and the second pressure plate 109 may alternatively or additionally be provided a spring element, such as a coil spring.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Veterinary Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- General Physics & Mathematics (AREA)
- Toxicology (AREA)
- Physiology (AREA)
- Dentistry (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Mattresses And Other Support Structures For Chairs And Beds (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Invalid Beds And Related Equipment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA51040/2015A AT518046B1 (de) | 2015-12-03 | 2015-12-03 | Drucksensor, Messmatratze, Liegestatt, Verfahren und Diagnosesystem |
| DE102016111261.5A DE102016111261A1 (de) | 2016-06-20 | 2016-06-20 | Drucksensor, Messmatratze, Liegestatt, Verfahren und Diagnosesystem |
| PCT/EP2016/079589 WO2017093485A2 (de) | 2015-12-03 | 2016-12-02 | Drucksensor, messmatratze, liegestatt, verfahren und diagnosesystem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3384262A2 true EP3384262A2 (de) | 2018-10-10 |
Family
ID=57482410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16805808.9A Withdrawn EP3384262A2 (de) | 2015-12-03 | 2016-12-02 | Drucksensor, messmatratze, liegestatt, verfahren und diagnosesystem |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3384262A2 (de) |
| WO (1) | WO2017093485A2 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10838391B2 (en) | 2017-10-04 | 2020-11-17 | Hcl Technologies Limited | System and method for swapping springs present in a product |
| CN111657894A (zh) * | 2020-06-29 | 2020-09-15 | 深圳数联天下智能科技有限公司 | 健康检测装置 |
| US11076764B1 (en) | 2020-08-24 | 2021-08-03 | Press-IR Inc. | Pressure sensitive mat system with dynamically calibratable pressure sensors and method for non-obtrusive monitoring of vital signs and other health metrics |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4446760C2 (de) * | 1994-12-24 | 1996-11-14 | Sensor Instr Gmbh | Vorrichtung zum Messen von Verformungen eines Gegenstandes |
| DE19523756A1 (de) * | 1995-06-29 | 1997-01-02 | Schlattl Werner Bavaria Tech | Arbeitsmaschine und Sensor für eine Arbeitsmaschine |
| NL2001822C2 (en) * | 2008-07-17 | 2010-01-19 | 2M Engineering Ltd | Force sensor and corresponding force monitoring mattress. |
-
2016
- 2016-12-02 EP EP16805808.9A patent/EP3384262A2/de not_active Withdrawn
- 2016-12-02 WO PCT/EP2016/079589 patent/WO2017093485A2/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017093485A3 (de) | 2017-08-10 |
| WO2017093485A2 (de) | 2017-06-08 |
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