Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/30—Input circuits therefor
  • A61B5/303—Patient cord assembly, e.g. cable harness
• • 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
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6813—Specially adapted to be attached to a specific body part
  • A61B5/6824—Arm or wrist
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/251—Means for maintaining electrode contact with the body
  • A61B5/256—Wearable electrodes, e.g. having straps or bands
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/263—Bioelectric electrodes therefor characterised by the electrode materials
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/271—Arrangements of electrodes with cords, cables or leads, e.g. single leads or patient cord assemblies
  • A61B5/273—Connection of cords, cables or leads to electrodes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
  • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
  • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
  • A61B5/282—Holders for multiple electrodes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/316—Modalities, i.e. specific diagnostic methods
  • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
  • A61B5/332—Portable devices specially adapted therefor
• • 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
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6802—Sensor mounted on worn items
  • A61B5/6803—Head-worn items, e.g. helmets, masks, headphones or goggles
• • 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
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6802—Sensor mounted on worn items
  • A61B5/681—Wristwatch-type devices
• • 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
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/6813—Specially adapted to be attached to a specific body part
  • A61B5/6814—Head
• • 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
  • A61B2562/18—Shielding or protection of sensors from environmental influences, e.g. protection from mechanical damage
  • A61B2562/182—Electrical shielding, e.g. using a Faraday cage
• • 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
  • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
  • A61B5/683—Means for maintaining contact with the body
  • A61B5/6831—Straps, bands or harnesses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
  • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal

Definitions

• the present disclosure falls within the field of measuring bioelectric signals, and more particularly of measuring cardiac activity. It also relates to a portable device for acquiring signals of the heart activity of an individual.
• ECG electrocardiogram
• cardiac abnormalities e.g. arrhythmia
• the upstream detection of cardiac disorders makes it possible to set up monitoring, which can, for example, be coupled with a suitable treatment (eg medicinal), or which may require the installation of a cardiac device (eg Pacemaker) .
• a suitable treatment e.g medicinal
• a cardiac device e.g Pacemaker
• the present disclosure improves the situation.
• the device may comprise: - a processing unit;
• - at least one measurement cable including a first end capable of being connected to the processing unit to form an input of an electric potential, and a second end; - a support, ready to be worn by an individual, said support supporting the cable so as to maintain a predefined path of the cable relative to the skin of the individual in a state of the support worn by the individual; the cable being further arranged so that, in the state of the support carried by the individual, any contact between an electrically conductive part of the cable and the skin of the individual is prevented; the second end of the cable being devoid of a skin contact electrode; the support being further arranged to maintain, in the state of the support worn by the individual, a predefined spacing (e) between a measuring portion of the cable and the skin of the individual, the predefined spacing being between 0 , 5 and 20 millimeters.
• e predefined spacing
• the preceding arrangements can allow a reduction in the size of a device for measuring cardiac activity, but also a reduction in the discomfort felt by an individual, in particular by direct contact with a usual electrode.
• This small footprint can allow an individual, thanks to a suitable support, to wear the device on parts of the body that are not very restrictive for everyday life, while allowing good quality measurements of cardiac activity.
• the device can be worn on the individual's forehead, the individual's wrist, or the individual's ankle.
• support denotes the parts that do not directly have an electronic and measuring function but rather a mechanical function of maintaining the electronic elements near / on / around the individual.
• a cable is arranged relative to the support and in the vicinity or in electrical contact with the surface of the skin.
• neighborhood it is understood that the measurement cable can be close to the surface of the skin without necessarily coming into physical or electrical contact therewith.
• the neighborhood can be defined according to the predefined spacing with the skin, and can be between 0.2 and 40 millimeters. Preferably, the predefined spacing is between 0.5 and 20 millimeters.
• the length of the predefined path of the measurement cable can be between 0.05 and 5 meters. Preferably, the length of the predefined path can be between 0.15 and 3 meters.
• the measurement cable can be formed of a conductor wire made of a metal (eg copper, aluminum, gold, nickel, etc.), and surrounded by an insulating material (eg polymer) constituting a measurement cable unshielded.
• a conductor wire made of a metal (eg copper, aluminum, gold, nickel, etc.), and surrounded by an insulating material (eg polymer) constituting a measurement cable unshielded.
• the insulating part can also be surrounded by a second conductor (electrically insulated from the first) in the form of a metal braiding so as to constitute a shield (i.e. a shielded measurement cable).
• Metal braiding can include copper or aluminum.
• the total diameter of the cable can be between 0.2 and 2 millimeters.
• the diameter of the conductor wire can be between 0.09 and 1.8 millimeters.
• the thickness of the insulating or dielectric material surrounding the conductive wire can be between 0.07 and 1.9 millimeters.
• the total diameter of the cable may be between 0.2 and 0.5 millimeter, the diameter of the conductive wire between 0.09 and 0.3 millimeter, and / or the thickness of the insulation between 0, 07 and 0.1 millimeter.
• the device may further comprise:
• At least one reference cable including a first end capable of being connected to the processing unit to form an electrical reference, or bias, the reference cable being supported by the support so that, in the state of the support worn by the individual:
• an electrically conductive part of the reference cable is in the vicinity or in electrical contact with the skin of the individual
• a predefined routing of the reference cable extends along the skin.
• electrical reference it can be understood an electrical reference different from the mass of the device.
• the electrical reference may be a voltage value other than zero volts, and may be measured in the vicinity of or in electrical contact with the skin.
• This reference cable connected to a voltage follower device can make it possible to reduce the voltage of the common mode.
• the voltage value of the electrical reference can be between -12 and 12 volts, preferably between -5 and 5 volts, and more preferably between 2 and 3 volts.
• the predefined length of the reference cable can be between 0.05 meters and 3 meters.
• the length of the predefined path can be between 0.15 and 0.50 meters.
• the measurement cable may include a shielding, thus forming a coaxial type cable, said shielding being able to be connected as ground to the processing unit.
• the central core (first conductor) of the cable corresponds to the conductor wire of a coaxial type cable and the metal braiding (second conductor) corresponds to the shielding of the coaxial type cable.
• a measuring cable with a shield such as a coaxial type cable, for example, can make it possible to measure an electrical potential via a double coaxial capacitor.
• the first capacitor can be formed between the individual's skin and the shield (i.e. ground of the measurement cable), and a second capacitor can be formed between the shield and the conductor wire of the coaxial type measurement cable.
• the measurement of the cardiac activity of an individual by a double coaxial capacitor effect can make it possible to obtain good precision in the measurement, while keeping a minimum size of the device.
• it allows a measurement without necessarily two points of contact, unlike the classic ECG.
• the device may further comprise at least one additional measurement cable including a first end adapted to be connected to the processing unit to form an input of at least one minus a second electrical potential, the support further supporting the additional measurement cable so as to maintain a predefined path of the additional measurement cable with respect to the skin of the individual in a state of the support worn by the individual.
• the use of an additional measurement cable can make it possible to improve the sensitivity of the measurement of the cardiac activity of the person P in the presence of parasitic electrical noise.
• Using an additional measuring cable can improve the signal-to-noise ratio of electrical potential measurements. This results in a more precise determination of the cardiac activity of the person P.
• the information obtained after processing the measurement data by the processing unit can be more precise and reliable in qualifying the individual's heart activity.
• the length of the predefined path of the additional measurement cable can be between 0.05 and 3 meters. Preferably, the length of the predefined path can be between 0.5 and 1.5 meters.
• the structure of the additional measuring cable may be of the same nature as the structure of the measuring cable, or be of a different nature.
• the additional measurement cable can be a shielded cable, or shielded of the coaxial type, or an unshielded cable such as a conductor wire surrounded or not by an insulating material.
• the use of a shielded structure for the additional measurement cable may have the advantage of improving the signal to noise ratio.
• the device may further comprise at least one surface electrode supported by the support so that, in the state of the support carried by the individual, each of the at least one electrode is in electrical contact with the skin of the individual, at least one cable of the device other than the measurement cable being connectable to the at least one electrode for placing in electrical contact with the skin of the individual via said electrode.
• the use of at least one surface electrode with at least one cable of the device other than the measurement cable can make it possible to improve a little more the sensitivity of measurement of the electrical potentials corresponding to the cardiac activity of the individual. More precisely, the use of a surface electrode can make it possible to further improve the signal-to-noise ratio of the measurement (s). Thus, it is possible to increase the precision of the information obtained from the measurements processed by the processing unit.
• the at least one electrode can be a dry electrode, making the addition of a contact fluid superfluous.
• the at least one electrode may comprise silicone doped with carbon.
• the support can be shaped as:
• the predefined routing of the measurement cable may have a length greater than or equal to 15 centimeters.
• FIG. 1 illustrates an example of a device for measuring the cardiac activity of an individual in one or more embodiments.
• FIG. 2a presents an illustration, in one or more embodiments, of a predefined path of at least one measurement cable included in the device worn by an individual P.
• Fig. 2b presents an illustration, in one or more embodiments, of a predefined path of at least one measurement cable included in the device worn by an individual P.
• FIG. 2b illustrates a section along the plane (y; z) of the measuring device shown in FIG. 2a.
• FIG. 2c illustrates, in one or more embodiments, an alternative to the predefined routing of the measurement cable described in FIG. 2a.
• FIG. 3a is an illustration, in one or more embodiments, of predefined routes of at least one measurement cable and several additional cables included in the device worn by an individual P.
• FIG. 3b illustrates an example of the arrangement of the cables of the device of Figure 3a in a section similar (y; z) to that of Figure 2b.
• FIG. 3c illustrates, in one or more embodiments, an alternative to the predefined routing of the cables described in FIG. 3a.
• FIG. 4 illustrates, in one or more embodiments, an exemplary configuration of a device for measuring cardiac activity worn on the wrist of the individual P.
• FIG. 5 illustrates, in one or more embodiments, an exemplary configuration of a device for measuring cardiac activity worn on the wrist of the individual P.
• FIG. 6 illustrates a schematic representation of a device for measuring the heart activity of an individual in one or more embodiments.
• Figure 1 illustrates an example of a device for measuring the cardiac activity of an individual in one or more embodiments.
• a device 100 for measuring cardiac activity comprises a support 101 adapted to be worn by a person P, whether for example during a period of activity (eg sports) or inactivity (eg sleep phase ).
• the support 101 (eg in the form of a band) is here adapted to be worn around the head of the person P.
• the support 101 is adapted to surround the head of the person P at least partially and in such a manner. to be maintained on it.
• the support 101 is for example suitable for surrounding at least part of a circumference of the head 120 (eg at the level of the surface of the skin of the forehead) of the person P, or at least half of a circumference of the head. head of person P.
• the support 101 is adapted to completely surround the head of person P.
• the support is suitable for being worn around a member of the individual P, such as for example at the level of a wrist (e.g. in the form of a bracelet).
• the device 100 further comprises a processing unit 103 and a battery 107, supported by the support 101.
• the processing unit 103 can be connected to one or more cables supported by the support 101.
• the processing unit 103 is further configured to collect information, in particular by means of electrical signals picked up and transported by the cables.
• the cables can be integrated inside the support 101, that is to say that the cables are neither visible nor accessible from the outside of the support 101.
• the cables can preferably be located as close as possible to the internal face of the support 101, and therefore as close as possible to the individual P (ie to the surface of the skin of the individual P).
• the cables are located on the exterior faces of the support, and preferably on the exterior face of the part of the support 101 in contact with the forehead (ie the surface of the skin) of the person P.
• Each cable of the device 100 comprises a conductive wire; optionally surrounded by an insulating material such as a polymer, thus forming a so-called unshielded cable.
• the so-called unshielded cable can be a reference cable between AWG # 44 and AWG # 15 defining a cable whose conductive section is equivalent to that of a diameter ranging from 0.05 millimeters to 1.45 millimeters (thus covering the case of a multi-stranded conductor wire whose apparent diameter is greater than that of the conductive section).
• the insulating material comprises at least one dielectric material (eg polyethylene (PE), polypropylene (PP), fluorinated ethylene propylene (FEP) and polytetrafluoroethylene (PTFE)).
• the dielectric material can be surrounded by a second conductor (e.g. in the form of a metal braiding) thus forming a shielded cable.
• the shielded cable can be a coaxial type cable.
• the so-called shielded cable can be, for example, an AWG # 40 reference cable defining a cable whose conductive section of the conductive wire is equivalent to that of a conductive cylinder with a diameter of about 0.08 millimeters.
• Figure 2a shows an illustration, in one or more embodiments, of a predefined path of at least one measuring cable included in the device 100 worn by an individual P.
• FIG. 2a may correspond to a front view of the person P (or individual P).
• the support 101 of the device 100 is shown from the front and in transparency so that the measuring cable 203 is visible.
• the measurement cable 203 here shielded (eg of the coaxial type) can be connected via its first end 203a to the processing unit 103 included in the device 100 for measuring cardiac activity, the shielding of the measurement cable 203 being connected to the ground of the processing unit 103.
• the second end 203b of cable 203 can be located at the end of a predefined route, and be left free, that is to say not connected to a third element. In particular, the second end 203b remains disconnected from any electrode in electrical contact with the skin).
• the measurement cable 203 can be used to measure a first electrical potential (or a value of a first electrical potential) by a double coaxial capacitor effect.
• the electrical potential can be an electrical potential generated during the cardiac cycle of the individual P, and propagating to the surface of the body.
• a first capacitor can be defined between the skin of the person P and the shielding (the braid or conductive sheet forming the ground) of the measurement cable 203.
• a second coaxial capacitor can be defined between the core of the cable (eg coaxial type), and shielding.
• the predefined path corresponds to the continuity of straight portions 203c; 203d; 203e and curved portions 203f; 203g.
• the term “straight” is understood here to be distinguished from “curved” portions. However, it is understandable that the "straight" portions themselves have a slight curvature corresponding to that of a human forehead.
• the path has a general sinusoidal or “serpentine” shape.
• the straight portions extend substantially along an x axis corresponding to the width of the forehead 120 of the individual P.
• the straight portions can extend in directions of the height of the individual's forehead (i.e. along the y axis in Figure 2a).
• the curved portions can be, for example, in the shape of a semi-circle, or in the shape of a semi-ellipse.
• Figure 2b illustrates a section along the plane (y; z) of the measuring device 100 shown in Figure 2a.
• the sectional view presents a possible arrangement when the predefined path (eg straight portion along the x axis) of the measuring cable 203 is housed inside the support 101, the support 101 being in contact with the front 120 of the person P.
• each portion of the cable 203c; 203d; 203e can be spaced from the skin (here from the forehead 120) at a predefined spacing 230.
• the predefined spacing 230 is measured between the center of each cable portion and the surface (skin) of the forehead 120 of the person.
• the reference 215 represents a surface passing through the center of the cable throughout its path. In a situation for which the predefined spacing 230 is homogeneous over the entire path of the cable 203, the surface 215 is therefore located at any point at the same distance from the front 120 of the individual P.
• the predefined spacing 230 can vary along the cable 203, so that some portions are closer than others to the surface of the skin, or even in electrical contact.
• the predefined route of the measuring cable 203 can be arranged so that the cable does not come into contact with the surface of the forehead 120 of the individual P.
• this predefined spacing 230 may be between 0.1 and 30 millimeters, whether it is substantially homogeneous or not. Preferably, this predefined spacing 230 may be between 0.5 and 20 millimeters. Preferably, this predefined spacing 230 may be between 0.4 and 2.5 millimeters.
• the predefined route of the cable 203 is arranged so that the portions of the measuring cable 203 do not cross above the front 120. In particular any contact between two portions of the cable measurement is avoided.
• Each cable portion can be separated from one or more neighboring portions by a predefined distance. For example, this separation can be measured between the centers 240 of each cable portion.
• the cable portion 230d is separated from the cable portion 203c by a separation distance 260a, and is separated from the portion 203e by a separation distance 260b.
• the separation distance between each portion of the measuring cable 203 is between 0 (contact) and 20 millimeters. Preferably, it is between 0 and 10 millimeters.
• the separation distance can be identical for each separation, or identical for certain separation, or even be different for each separation.
• the predefined path can be advantageously arranged so as to efficiently optimize the measurement of one or more electrical potentials on the surface of a body (eg on the surface of the forehead of the person P) while maintaining minimal bulk. of the means of measurement, and without constraint for the individual.
• FIG. 2c illustrates, in one or more embodiments, an alternative to the predefined routing of the measurement cable described and represented in FIG. 2a.
• the characteristics of the device 100 presented in FIG. 2a and FIG. 2b in particular, the characteristics and constraints relating to the position between the portions of cables, or the characteristics and constraints relating to the positioning relative to the support 101 and to the individual P, can be partially or totally transposed to the embodiments shown in FIG. 2c.
• the straight portions (eg 203c and 203e) of the predefined routing of the measurement cable 203 shown in FIG. 2a may be in the form of a sinusoidal type configuration rather than in the form of a straight type configuration.
• the advantage of such a shape in the predefined path may be the optimization of the size of the measurement cable. Another advantage can be to guarantee the integrity of the measuring cable. Indeed, the support 101 being slightly elastic, the elongation of the support carried by an individual can generate a tensile stress on the straight portions of the cable. Such stresses can eventually lead to damage to the measuring cable.
• the predefined path can be in the form of any suitable configuration to limit the size of the measurement cable, while having a large total length and therefore a reliable electrical interaction.
• FIGS. 3a and FIG. 3b illustrate an alternative to the embodiments presented in FIG. 2a and FIG. 2b.
• the characteristics of the device 100 presented in FIG. 2a, FIG. 2b, and FIG. 2c, the characteristics and constraints relating to the position between the portions of cables, as well as the characteristics and constraints relating to the positioning relative to the support 101 and to the individual P, can be partially or totally transposed to the embodiments shown in FIG. 3a and FIG. 3b.
• FIG. 3a is an illustration, in one or more embodiments, of predefined routes of at least one measurement cable and of several additional cables included in the device worn by an individual P.
• the measurement cable 203 is unshielded.
• the measurement cable 203 can be shielded.
• the additional cables can have different respective functions.
• one of the additional cables of the device 100 may be an additional measurement cable 304.
• the additional measurement cable 304 is supported by the support 101, and may have structural characteristics. similar to those described above with respect to the measurement cable 203.
• the measuring cable 203 and the additional measuring cable 304 may have different structural characteristics.
• the additional measuring cable 304 has two ends 304a; 304b.
• the first end 304a can be connected to the processing unit 103.
• the second end 304b can be connected to a third element such as a electrode 306 intended to come into contact with the skin.
• a dry and / or doped carbon electrode is particularly reliable while being of little inconvenience to the individual.
• the additional measurement cable 304 includes a straight portion 304c extending along the predefined path of the measurement cable 203.
• the first electric potential is obtained through a first capacitor defined between the skin of the person P and the conducting wire of the measurement cable 203.
• the second electric potential is obtained through a second capacitor defined between the skin of person P and the conductor wire of the additional measurement cable 304.
• this embodiment using one or more measurement cables as well as a reference cable can make it possible to increase the signal-to-noise ratio as well as the temporal resolution of the measured signals. This results in a more accurate measurement of heart activity.
• one of the additional cables included in the device 100 can be a reference cable 305.
• This reference cable (or skew cable) supported by the support 101 can be used as an electrical reference.
• the reference cable 305 can have structural characteristics similar to those described above for the other cables.
• the reference cable 305 can have different structural characteristics compared to the other cables of the device 100.
• the reference cable 305 is connected via a first end 305a to the processing unit 103.
• a second end 305b of the cable 305 is located at the end of a predefined path, and is left free, that is to say not connected to a third element.
• Reference cable 305 extends, here, along a portion of the predefined routing of the measurement cable 203.
• the reference cable 305 is positioned either in the vicinity or in electrical contact with the surface of the skin of the individual P.
• the reference cable 305 makes it possible to acquire a reference voltage value which can be used by the processing unit 103 to reduce the common mode voltage (“Common Mode Voltage”, or “CMV”, in English ).
• the common mode voltage can correspond to a common voltage value on each measurement input, that is to say a voltage value present both in the measurement of the first electric potential via the measurement cable 203. and in measuring the second electrical potential via the additional measuring cable 304.
• the common mode voltage value can be problematic when measuring low amplitude electrical signals. . It can, for example, impact the precision of the measurement, or even obscure the desired measurement.
• this common mode value can be understood as the average value of the potential of the body of the individual P.
• this average value of the potential of the body can be subtracted from the respective potential value measured at each cable.
• the second end 305b of the reference cable 305 can be connected to a third element in electrical contact with the surface of the skin of the individual P.
• the third element (not shown in FIG. 3b) can be an electrode (eg dry electrode and / or doped with carbon).
• the use of an electrode can, for example, make it possible to more precisely measure the common mode voltage; and more reliably over time and with movement of the individual, and therefore improve the reduction of CMV.
• Figure 3b illustrates an example of the arrangement of the cables of the device of Figure 3a according to a section similar (i.e. (y; z)) to that of Figure 2b.
• the characteristics and constraints relating to the position between the portions of cables or between the cables, as well as the characteristics and constraints relating to the positioning relative to the support 101 and to the individual P, can be partially or totally transposed to the embodiments shown in FIG. 3b.
• similar constraints can be an arrangement of cables without crossing their respective portions, portions not brought into contact with the skin surface, or brought into contact with the skin surface.
• each portion of the various cables 203c; 203d; 203e, 304c; 305c is spaced at the preset spacing 230.
• respective predefined spacings for each cable can be arranged so that certain portions of the different cables are closer than others to the surface of the skin, or even in electrical contact.
• the portion 305c of the reference cable 305 is separated from the portion 203c of the measuring cable 203 by a separation distance 360a , and is separated from the portion 203d of the cable of measurement 203 according to a separation distance 360b. Furthermore, the portion 203e of the measurement cable 203 is separated from the portion 203d of the measurement cable 203 by a separation distance 360c , and is separated from the portion 304c of the additional measurement cable 304 by a separation distance 360d.
• the separation distance may be identical for each separation, or identical for certain separation, or even be different for each separation.
• FIG. 3c illustrates, in one or more embodiments, an alternative to the predefined routing of the cables described in FIG. 3a.
• the characteristics of the device 100 presented in FIG. 3a and FIG. 3b in particular, the characteristics and constraints relating to the position between the portions of cables or between the cables, as well as the characteristics and constraints relating to the positioning. relative to the support 101 and to the individual P, can be partially or totally transposed to the embodiments shown in FIG. 2c.
• the straight portions of the predefined path of the first measurement cable 203, of the additional measurement cable 304, and of the reference cable 305 shown in FIG. 3a can be in the form of a sinusoidal type configuration or in any form suitable for limiting the size of the various cables of the device.
• each cable can be connected to an electrode 306; 307.
• Figures 4 and 5 each illustrate, in one or more embodiments, an exemplary configuration of a device for measuring cardiac activity worn at the wrist 420; 520 of the individual P.
• the description relating to the embodiments of FIGS. 2a, 2b and 2c can easily be partially or totally transposed to the embodiments of FIG. 4 (single shielded cable) while the description relating to the embodiments of FIG. 3a, 3b and 3c can easily be transposed to the embodiments of FIG. 5 (three cables).
• the elements having the same reference numerals as the elements of the previous embodiments have the same functions, similar characteristics and the same possible variations.
• the configurations of the device 100 worn on the wrist can therefore include elements similar to the configuration of the device worn at the level of the head, and presented in the preceding figures, including in dimensional terms.
• the cable ducts here take the form of a spiral winding, preferably with several turns and without crossing, around the limb.
• FIG. 6 functionally illustrates a device for measuring the cardiac activity of an individual in one or more embodiments.
• the measuring device 600 comprises a memory 605 for storing instructions of a program.
• the memory 605 can further store measured data such as values of electrical potentials. This makes it possible, for example, for the device to be at least temporarily autonomous, for example overnight. Thus, any communication with third-party equipment is superfluous and the use of wireless communication means in the immediate vicinity of a user for a long period of time is avoided.
• the program can be executed by a processing circuit (or processing unit) 603 configured, at least, for the acquisition of measurements, such as for example electrical signals.
• the processing circuit 603 can be for example:
• processor or processing unit suitable for interpreting instructions in computer language
• the processor or processing unit may include, or may be associated with, a memory comprising instructions, or
• a programmable electronic chip such as an FPGA chip (for “Field Programmable Gâte Array”).
• the device for measuring the cardiac activity of an individual 600 further comprises an input interface 607 intended to be connected to the cables (generally designated here by the reference 613) for measuring the electrical potentials emitted during the cardiac activity of an individual P or to determine an electrical reference.
• the input interface can also acquire data from telecommunications means 611, such as for example a radio frequency receiver.
• the data acquisition can for example correspond to software and / or hardware updates of the measuring device 600.
• the device for measuring cardiac activity 600 further comprises an output interface 609 for sending information data relating to the cardiac activity of an individual by means of telecommunications 615, such as for example a radiofrequency transmitter.
• Information data relating to the cardiac activity of an individual can for example be sent to a remote server or to a third-party device (eg telephone).
• the device further comprises a battery 617 so as to supply energy to the various hardware components of the device 600.

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• 2020
  • 2020-04-08 FR FR2003542A patent/FR3109079B1/fr not_active Expired - Fee Related
• 2021
  • 2021-04-07 EP EP21722523.4A patent/EP4132362A1/de not_active Withdrawn
  • 2021-04-07 WO PCT/FR2021/050605 patent/WO2021205116A1/fr not_active Ceased
  • 2021-04-07 US US17/917,773 patent/US20230140615A1/en not_active Abandoned

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