WO2017109520A1 - Système portatif de surveillance du rythme et de l'activité cardiaques - Google Patents

Système portatif de surveillance du rythme et de l'activité cardiaques Download PDF

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Publication number
WO2017109520A1
WO2017109520A1 PCT/GB2016/054077 GB2016054077W WO2017109520A1 WO 2017109520 A1 WO2017109520 A1 WO 2017109520A1 GB 2016054077 W GB2016054077 W GB 2016054077W WO 2017109520 A1 WO2017109520 A1 WO 2017109520A1
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WO
WIPO (PCT)
Prior art keywords
package
heart rate
rate monitor
heart
communications
Prior art date
Application number
PCT/GB2016/054077
Other languages
English (en)
Inventor
Alon Moss
Original Assignee
Cloudtag Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB1522875.2A external-priority patent/GB2545740A/en
Priority claimed from GB1600136.4A external-priority patent/GB2547631A/en
Application filed by Cloudtag Inc filed Critical Cloudtag Inc
Publication of WO2017109520A1 publication Critical patent/WO2017109520A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02444—Details of sensor
    • 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
    • A61B5/274—Connection of cords, cables or leads to electrodes using snap or button fasteners
    • 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
    • A61B5/6804—Garments; Clothes
    • A61B5/6805—Vests
    • 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
    • A61B5/6823—Trunk, e.g., chest, back, abdomen, hip
    • 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
    • A61B5/6838—Clamps or clips
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0204—Operational features of power management
    • A61B2560/0214—Operational features of power management of power generation or supply
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/04—Constructional details of apparatus
    • A61B2560/0406—Constructional details of apparatus specially shaped apparatus housings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/04—Constructional details of apparatus
    • A61B2560/0443—Modular apparatus
    • A61B2560/045—Modular apparatus with a separable interface unit, e.g. for communication
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/04—Constructional details of apparatus
    • A61B2560/0462—Apparatus with built-in sensors
    • 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
    • A61B2562/0223—Magnetic field sensors
    • 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
    • A61B2562/16—Details of sensor housings or probes; Details of structural supports for sensors
    • A61B2562/164—Details of sensor housings or probes; Details of structural supports for sensors the sensor is mounted in or on a conformable substrate or carrier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/20—The network being internal to a load
    • H02J2310/23—The load being a medical device, a medical implant, or a life supporting device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling

Definitions

  • the present invention concerns a system of components and processes whereby a human or animal heart rate (pulse) and other factors indicative of metabolism can be accurately and conveniently sensed and recorded during normal and vigorous exercise activity.
  • a human or animal heart rate pulse
  • other factors indicative of metabolism can be accurately and conveniently sensed and recorded during normal and vigorous exercise activity.
  • Non-contact sensors have been researched as exemplified by the disclosure in
  • An object of a non-contact sensor is to facilitate mounting the monitor for use close to the chest and heart without resorting to straps and adhesives. For example to clamp or pin the monitor to the an item of clothing such as a sports bra.
  • mounting in this way inevitably means that the sensor will move relative to the subject users skin, both towards and away from the skin and parallel to the skin. Such movements will induce fluctuations in the output signal which obscure the fluctuations induced by the beating heart (the heart field or heart signal).
  • the electric field generated by the heart action is very weak and is liable to fluctuate in frequency and amplitude during exercise.
  • the heart field is also weak by comparison with unwanted electric fields generated by other user muscular activity, in particular involuntary muscular activity caused by respiration and voluntary muscular activity caused by exercise.
  • the sensors are also liable to pick up electrical noise from nearby extraneous machinery.
  • the unwanted electric fields have hitherto proven difficult to eliminate reliably with a monitor system which is convenient and practical to use.
  • sensor package containing the bio-electrode strapped to the chest of a user via a band.
  • Such electrodes are susceptible to poor connectivity depending on the condition and preparation of the subjects skin. Signals from the sensor package are fed to a processing and recording device, often a wrist borne device or smart phone.
  • Communication is via a wire or wirelessly via a protocol such as ZIGBEE®,
  • each of the sensor package and PRD must have separate power supplies, usually in the form of compact cells.
  • the cells require frequent inconvenient and expensive replacement.
  • Rechargeable cells require ports for charging plugs which may add to the weight and size of the package and may be vulnerable to fouling or damage.
  • One aim of the present invention is to provide a system which provides the
  • Wrist-borne wearable devices need to take account of aesthetic appearance as well as weight and bulk, especially, but certainly not exclusively, if the device is intended for use by women. It is therefore desirable to be able to provide a writs wearable device which is slim and light without being fragile. It is also desirable to be able to readily change the wristband, for repair, and more importantly for aesthetic reasons.
  • US2014156916 discloses a wrist band formed of a single unitary moulding of a viscoelastic material including a chamber into which a correspondingly shaped fitness monitor is inserted and retained by cooperation between the shape of the monitor device and chamber and the elasticity of the watchband. Inserting the monitor device requires removal of the wristband from the wrist and is somewhat fiddly.
  • the use of such unitary structures moulded from elastic materials necessarily limits the design opportunities and materials which can be used.
  • the Apple ® watch addresses the problem of exchanging a wrist band by means of a substantial case of sufficient depth to have two cylindrical channels formed into it.
  • a wristband has two cylindrical formations provided at an end intended for attachment to the watch.
  • the cylindrical formation is adapted to be captured into the cylindrical channel so attaching the strap.
  • a strap can easily be exchanged and can be formed from a range of materials with many design freedoms for the designer, the case of the Apple ⁇ watch is necessarily thick to accommodate the cylindrical formations.
  • the present invention aims to address at least one of the technical problems described above in a heart rate and activity monitoring system.
  • a wearable heart rate and activity monitor system comprising:
  • the heart rate monitor package contains, a non-contact sensor system capable of sensing changes in a bio-electric field indicative of heart activity, a rechargeable power supply, and a charge transfer module;
  • the communications package comprising a wireless communications module and a communications package rechargeable power supply
  • the charge transfer module will include means to receive a charge from an external power supply and transfer the charge onto the heart rate monitor package power supply.
  • An external power supply may be any source of electric charge and will preferably be transferred via an inductive charging external power supply to an inductive charging module having a charge storage cell within the heart rate monitor package power supply.
  • the means to separable connect the heart rate monitor package and
  • the communications package forms a clip to grip a fabric,.
  • a surface of the heart rate monitor package provides one jaw of the clip while the surface of the communications package provides the opposing jaw.
  • the connected heart rate monitor package and communications package can conveniently be clamped around the edge of a sports bra or the collar of a shirt close to the chest and underlying heart.
  • the communications package power supply may comprise a permanent magnet arranged to attract a permanent magnet disposed within the communications package.
  • the means to separably connect may further comprise a flexible strap or "U" shaped spring supporting conductors and connectors to electrically connect the heart rate monitor package to the communications package.
  • a flexible strap is used the magnetic attraction between the heart rate monitor package and the communications package will be sufficient to enable a span of clothing to be firmly clamped between the heart rate monitor package and the communications package thus securing the combined heart rate monitor package and communications package to the user.
  • the flexible strap may be replaced by a hinge spring biased to close the jaws of the clip. The hinge may or may not be assisted by a magnetic closure.
  • Each capacitance electrode will preferably be protected from external interference by means of an active shield guard ring forming a faraday cage.
  • the capacitance electrodes will receive electric field signals generated by all the subject's active muscles, not solely the heart. The most consistent activity will be from the subject breathing.
  • analogue and/or digital filters will operate to isolate signals generated from the heart activity from other electrical signals generated by other muscle activity such as respiration and voluntary muscle activity.
  • the received signals may be amplified by differential amplifiers tuned to filter out noise signals outside the frequency range of the heart generated signals to eliminate motion generated noise.
  • a Driven right Leg (DRL) and/or an active body ground to further reduce motion artefacts, and DC noise generated from the capacitive connection.
  • a fast test signal outside the frequency range of interest to evaluate quality of body connection.
  • An adaptive filter responsive to feedback from the fast test signal to further filter out noise.
  • An adaptive filter based on amplitude to remove poor signals.
  • the communications package then retransmits the signals to a processing and readout device such as an application equipped smartphone or any other computer to be recorded processed and stored.
  • a processing and readout device such as an application equipped smartphone or any other computer to be recorded processed and stored.
  • the heart rate monitor package When the heart rate monitor package is not in use it may be stored connected to a charger, preferably an inductive charger.
  • the communications package may contain additional sensors such as a temperature sensor or acceleration sensor.
  • the communications package may be adapted to be coupled to a body fastening such as a wrist band, finger ring, brooch, thigh band, ankle band, belt, or headband whereby it can be secured to a subjects wrist, finger, leg, lower torso, neck or forehead to capture data from the movement and general activity of the user.
  • a body fastening such as a wrist band, finger ring, brooch, thigh band, ankle band, belt, or headband
  • the communications package can be used substantially continuously to collect data and serve other functions such as a time keeping watch without the need to interrupt use for charging.
  • a heart rate and activity monitor system comprising:
  • heart rate monitor package contains
  • a pair of contactless sensors capable of sensing changes in a bio-electric field indicative of heart activity
  • the signals from each contactless sensor are filtered through a motion differential amplifier disposed in one of the heart rate monitor package or the communication package and arranged to subtract signal changes caused by relative movement of the heart rate monitor sensor package and the user.
  • the sensors are separated and will sense a difference in strength of the heart electric field.
  • the difference will be amplified by the motion differential amplifier. Changes in field strength caused by movements common to each sensor will be suppressed.
  • a heart rate and activity monitor system comprising:
  • the heart rate monitor package has a subject skin facing side and an opposite clip facing side and contains a pair of contactless sensors capable of sensing changes in a bio electric field indicative of heart activity
  • a guard amplifier arranged to receive signals from the contactless sensor and disposed in one of the heart rate monitor package or the communication package; wherein a conductive layer is disposed to partially envelop each capacitive sensor on the clip facing side and is coupled to a guard amplifier stage to shield the contactless sensor from extraneous signals.
  • the conductive layer leaves the subject facing side of each capacitive sensor exposed.
  • the conductive layer extends into one or more side walls forming a cup around the capacitive sensor.
  • the conductive layer is electrically connected to the guard differential amplifier stage to provide an active guard ring which attenuates the capacitive sensor signals induced by random motion of the monitor.
  • a heart rate and activity monitor system comprising:
  • a fast signal generator to generate a signal with a predetermined frequency "fast” in comparison with the frequency of the heart and to project an oscillating electric field at a frequency corresponding to the fast frequency
  • contactless sensors arranged to communicate with a fast filter module tuned to the "fast" frequency and a processor module responsive to a signal passed by the fast frequency filter to confirm that the contactless sensors are sensing a signal from the subject's bio-electric field without interfering with the heart rate signal.
  • the system will have at least one pair of contactless sensors and may have three or more contactless sensors any two of which may be paired or may have multiple pairs of contactless sensors.
  • the monitor may include any possible combination of the first second and third aspects of the invention and will preferably include each of the first second and third aspects and the preferred features mentioned above.
  • the means to connect the heart rate monitor package to the communications package will preferably be means to separably connect including a plug and socket to facilitate deliberate connection and disconnection during normal use.
  • the heart rate monitor package will preferably include a charge transfer module having means to receive a charge from an external power supply and transfer the charge onto the heart rate monitor package power supply.
  • An external power supply may be any source of electric charge.
  • the connected heart rate monitor package and communications package can conveniently be clamped around the edge of conventional clothing such as a sports bra or the collar of a shirt close to the chest and underlying heart.
  • the communications package then retransmits the signals to a processing and readout device such as an application equipped smartphone or any other computer to be recorded, processed and stored.
  • a processing and readout device such as an application equipped smartphone or any other computer to be recorded, processed and stored.
  • the heart rate monitor package When the heart rate monitor package is not in use it may be stored connected to a charger, preferably an inductive charger.
  • a heart rate and activity monitor system comprising:
  • a heart rate monitor sensor package having non-contact sensors capable of sensing changes in a bio electric field indicative of heart activity
  • the movements of large muscle groups involved in physical exercise result in electric field fluctuations with an amplitude large by comparison with the heart signal.
  • the motion sensor may be used to identify which received signals correspond to such motions and set an active amplitude filter, responsive to the motion sensor signals, to eliminate such signals. Because the motions sensed may vary suddenly as the activity changes these filters will update frequently.
  • an array of at least two non-contact sensors capable of detecting changes in a bio electric field generated by a beating heart near to the array, wherein the array is disposed in a seat belt to detect the pulse of a person seated in the seat.
  • an array of at least two non-contact sensors capable of detecting changes in a bio electric field generated by a beating heart proximate the array, wherein the array is disposed in the mattress of a stretcher or bed to detect the pulse of a person lying in the stretcher or bed.
  • the eight aspect of the present invention provides a heart rate monitor system having:
  • a fast signal generator arranged to generate an electric field having a frequency high in comparison with the bio-electric heart field
  • a processor adapted to execute a process whereby the strength of the fast signal received by each of the array of sensors is detected and compared to each of the other received signals, said processor responsive to said comparison to select the pair of sensors receiving the two strongest high frequency signals to detect a heart rate signal.
  • the array of sensors will comprise at least three and in most cases many more sensors to cover the region of a seat back or mattress where the upper torso of a seated or lying person is expected to rest.
  • One preferred example has an array of nine sensors.
  • the system facilitates the selection of a pair of sensors receiving the best signal and therefore able to filter the most reliable pulse. In a car environment, additional functionality may be achieved by the fast signal.
  • the system may self- adjust to allow different size persons, or different clothing (i.e. winter/Summer wear) - selecting the appropriate sensor automatically.
  • the system may set a minimum threshold signal strength determined so that any
  • the system may interface with a monitor system able to detect significant changes to the heart signal received. For example, if the heart rate escalates rapidly it may indicate anxiety. An erratic heart rate may indicate deteriorating health or other distress. Frequent or erratic changes to the pair of sensors detecting the heart rate may indicate other discomfort, for example increased levels of pain. The loss of the heart signal is likely to indicate that the subject has moved from the seat, stretcher or bed and may need attention.
  • the monitor system may include means to periodically compare the heart rate received from the system with an earlier established record of the subjects heart rate in order to determine if the system should alert a supervisor, for example a nurse.
  • said wrist band comprising a ring into which the communications package can be received and removably secured and at least one strap part attached to the ring by an attachment assembly;
  • the ring will preferably extend around a through hole into which the communications package fits. For aesthetic reasons and to save weight and material it is desirable to make the ring small in cross section.
  • the ring is also preferably arcuate where the strap part attaches and two attachment assemblies will be required on opposing parts of the ring.
  • the strap of the wrist band must be formed of a material different to the ring to comply with the requirement that the ring is stiff and compact while the strap must flex to bend around a wrist, and may need to be elastic if a single strap part is used as an alternative to male and female strap parts with a fastening.
  • Figure 1 is an isometric view of an heart rate monitor package and communications package separated, to be brought into contact;
  • Figure 2 is an isometric view of the heart rate monitor package and communications package coupled together for use during exercise;
  • Figure 3A is an isometric view of the heart rate monitor package with the cover removed to show some internal details
  • Figure 3B is a side elevation of the communications package
  • Figure 3C is a bottom view of the communications package:
  • Figure 4 is a sketch of the connected heart rate monitor package and communications package clamped to a sports bra during use
  • Figure 5A is an isometric view of a wrist band and mount for the communications package
  • Figure 5B is an isometric view of a wrist band with the communications package mounted.
  • Figure 6 is a block diagram of the system components.
  • Figure 7B is a isometric view of the skin facing side of the circuit board
  • Figure 7C is a plan view of the circuit board
  • Figure 8B is a circuit diagram of an op amp stage
  • Figure 9A is circuit diagram of a fast frequency generator
  • Figure 9B is a circuit diagram of a fast frequency band pass filter
  • Figure 10 is a flow chart illustrating the control process for an adaptive frequency band filter responsive to movement sensed by a motion sensor
  • Figure 1 1A is a diagram illustrating the hardware implementation of a noise reduction system
  • Figure 1 1 B is an image of an analogue circuit
  • Figure 1 1 C is an image of an electrode and shield
  • Figure 12 is a diagram illustrating the filter stages of the noise reduction system illustrated in figure 1 1 and which may be implemented in any embodiment of the heart rate and activity monitor system;
  • Figure 13A is a diagram of a second embodiment of the heart rate monitor system implemented in a chair, seat, bed or stretcher;
  • Figure 13B is a perspective view of a car seat incorporating the second embodiment of the system
  • Figure 13C is a partial side view of the back of the car seat of figure 13B;
  • Figure 15 is a perspective view of a wrist band part of the first embodiment
  • Figure 16 is an exploded perspective view of the wrist band of figure 15.
  • Figure 17 is a partial view of a strap part end of the wrist band of figure 15
  • the system of the embodiment shown comprises a heart rate monitor package 1
  • the heart rate monitor package 1 comprises a rear or skin side housing part 4 intended to sit next to the skin of a user.
  • a front housing part 5 is secured by screws to the rear housing part 4 to form a sealed hollow enclosure.
  • a "U" shaped spring 6 extends from a base of the heart rate monitor package 1 to support a clasp 7 having two resiliently deformable arcuate horn shaped elements 8 adapted to engage in a groove 9 extending around the periphery of the
  • Conductors (not shown) run through the spring 6 from the electronics in the heart rate monitor package 1 to connectors 10 which couple with corresponding connectors 1 1 formed in the underside of the communications package 2.
  • the connectors 10, 1 1 and spring 6 are adapted to facilitate deliberate connection and separation of the heart rate monitor package and the communications package 2.
  • Figure 6 illustrates the electronics in the heart rate monitor package 1 and
  • the electronics in the heart rate monitor package 1 is powered by a heart rate monitor package power supply 29 comprising a rechargeable chemical cell and an inductive charging module
  • a heart rate monitor package power supply 29 comprising a rechargeable chemical cell and an inductive charging module
  • the electric field generated by a heart pulse is sensed by a pair of contactless sensors 12 provided by capacitance sensors.
  • the sensors 12 are shielded from external electric fields by an active shield 13.
  • Signals received from the contactless sensors 12 are filtered by a low and high pass differential amplifier 14 to isolate signals with the frequency appropriate to a heart pulse, ie approximately 0.6Hz to 3.3 Hz.
  • the filtered signals are fed to a communications module and transmitted via
  • Communications package 2 includes an input module 18 to communicate signals
  • the communications package 2 includes a communications package power supply 20 including a power storage cell charged by charge received from the heart rate monitor package power supply 21 during connection over two or more of the conductors in the spring 6.
  • a magnet 23 is disposed in the heart rate monitor package 1 and works in concert with a magnet or ferromagnetic material (not shown) provided in the communications package 2 to close the gap between the front of the heart rate monitor package 1 and the back of the communications package 2.
  • ribs 24 are formed on the front of the heart rate monitor package 1 .
  • contactless sensors 12 are embedded. Each sensor consists of a main plate 12a embedded in the skin facing surface 33 of the PCB 32.
  • a shield plate 12b is annular and overlies the opposite clip facing side of the main plate 12a.
  • Shield plate 12b is formed with a rim wall 12c which encircles the main plate.
  • a hole 12d is formed through the shield plate 12b and provides an insulated passage for a conductor 12e communicating the main plate to a guard differential amplifier.
  • a conductor 12f communicates electrically with the shield plate 12b and perforates the clip side of the PCB to communicate with and be grounded by the guard amplifier stage.
  • the contactless sensor 12 is effectively shielded from extraneous electric field signals by a faraday cage formed by the shield plate.
  • the PCB 32 is embedded in the heart rate monitor package as shown in figure 3.
  • each contactless sensor is connected via the conductors to the inputs of a guard differential amplifier stage 34 as shown in figure 8A.
  • the output from each guard differential amplifier stage is delivered to a frequency band pass filter 35 tuned to eliminate frequencies below 0.7 Hz and above 3.5 Hz before non-unity gain signal amplification at gain amplification stage 36.
  • Fig 9A illustrates the high frequency fast test signal generator designed to generate a 2kHz sine wave in fluctuation in an electric field projected from a 2kHz pad (not shown) located on the skin side of the heart rate monitor package 1.
  • the signal generator circuit may be built onto the PCB 32.
  • Fig 9B illustrates the two fast frequency test channels connected to each of the two contactless sensors 12' and 12". To be concise only one of the two identical channels will be described. Signals received from the first contactless sensor electrode 12a are communicated to a high pass filter stage 37 tuned to pass frequencies received above 1590Hz. The remaining signal is then passed to a low pass filter stage 38 which eliminates signal with frequencies above 2340H The human body does not naturally generate electric fields with frequency fluctuations of this size so any signal emitted from the low pass filter stage 38 will have been induced by the fast test signal emitted by the generator of figure 9A.
  • the quality of the fast test signal received through the low pass filter 38 can be used to adjust the settings of other analogue or digital filters of the system and thereby improve reception of the heart signal.
  • FIG 10 illustrates the process of operation of a digital filter wherein the signals from the accelerometer 27 are read for a predetermined period and digitised at step 101.
  • the accelerometer readout is analysed for regular cycles of movement and the movement frequencies are identified.
  • the movement frequencies are then applied to a frequency bandwidth filter at step 103 to remove signals of corresponding frequency from the detected electric field signal to reveal the heart signal.
  • Figure 1 1 diagrammatically illustrates the configuration of a pair of contactless sensor electrodes 12 each having a metal main plate12a and the shield plate 12b.
  • the shield plate is electrically grounded to shield the main plate 12a from any electric field generated from a source other than the human body.
  • Field signals captured by the main plate 12a are communicated to an analogue circuit layer 12i which is physically disposed overlying the electrode and shield 12b.
  • the analogue circuit layer communicates with a digital processor layer 12j.
  • the high frequency test signal is generated from a high frequency electrode 12k
  • the primary high frequency signal is not directly sensible to the main plate12a.
  • the high frequency signal will have an effect on any heart signal generated by the subjects body. If the heart signal can be sensed by the main plate 12a this will be confirmed by filters tuned to the high frequency 2kHz signal.
  • the combined signals from the main plates 12a are applied to a differential amplifier , subject to analogue filtering and the output digitised.
  • the CPU is responsive to the presence of both high frequency signals detected by each main plate 12a' and 12a" being flagged as present to process the ECG sample signal from the differential amplifier. If either flag is missing at least one main plate has an inadequate heart signal pickup and the ECG sample signal is not processed by the CPU.
  • FIGS 13A to 13C illustrate a second embodiment of the system implemented in a car seat, in this embodiment an array 30 of nine electrodes 12 is disposed in the back of a vehicle seat 31.
  • the nine electrodes are disposed on the nodes of a regular rectangular grid.
  • the array is located in a region of the seat back above the lumber support 33 and below any head restraint 34 to be coincident with the upper torso of a person sitting in the seat and therefore probably coincident with the person's heart. It will be understood that a greater or lesser number of electrodes 12 may be deployed on the array and the array may be arranged in other patterns.
  • the array may be hidden behind the back seat fabric 32 of the vehicle seat 31 so that none of the electrodes are naked eye visible. Included in the array is at least one high frequency test signal electrode 12k. There may be multiple test signal electrodes associated one each with each electrode or a single electrode dispersed over the region of the array.
  • step 206 The process goes from step 206 to step 207 where the system checks for any
  • the process checks for two or more values of tn being registered, that is that at least two sensors 12 are receiving high frequency signals above the threshold T. If there are two or more sensors 12 receiving above threshold signals the systems progresses to step 209 where each value of tn registered is compared to the other registered values of tn to determine which two sensors 12 are receiving the strongest signal. At step 210 the sensors 12 receiving the strongest signals are selected and applied to the differential amplifier and other filters to derive the heart rate.
  • step 212 the system counts a predetermined period, for example one second before resetting the register count to zero and clearing the recorded values of tn before returning to step 201 to repeat the process.
  • Figures 15-17 illustrate an embodiment of a wrist band adapted to receive a
  • the wrist strap is in two parts; male 3a and female 3b.
  • Frame 25 is in the form of a ring having two elongate straight parallel side members 39 joined by two arcuate end parts 40.
  • the arcuate end parts 40 are each formed with two circumferentially spaced blind recesses 41 which open into an outer wall surface of the arcuate end part at passage 42.
  • Each recess 41 is elliptical in cross-section with the major axis of the ellipse extending at an acute angle relative to the long axis of the frame 25.
  • a frame joining end of the female watch strap part 3b is shown in figures 16 and 17.
  • Each watch strap part 3a, 3b is moulded from plastics.
  • a spring 43 is embedded in the frame joining end of the watch strap part 3a, 3b.
  • the spring 43 is generally "U" shaped having two parallel prongs 44 extending from a cross bar 45.
  • the ends of each prong 44 remote from the cross bar 45 are fabricated with formations 46.
  • the formations 46 are of elliptical cross section and correspond in size and shape to the size and shape of each recess 41 . As with the recesses, the major axis of the elliptical formations 46 are inclined at an acute angle to the long axis of each prong 44.
  • the joining end of the watch strap part is formed to an arcuate shape corresponding to the shape of the arcuate end 40.
  • each formation 46 is pressed through passage 42 into one of the recesses 41 .
  • the material and structure of the formations and spring prongs are such as to allow the formations to deform elastically to be received into the recesses and recover when located. Once recovered in location the formations act as barbs preventing withdrawal of the formation from the recess.
  • the recesses 41 may open into the underside or

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Veterinary Medicine (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Medical Informatics (AREA)
  • General Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Cardiology (AREA)
  • Physiology (AREA)
  • Power Engineering (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Abstract

L'invention concerne un système portatif de surveillance du rythme et de l'activité cardiaques comprenant un module de surveillance du rythme cardiaque (1) et un module de communication (2). Le module de surveillance du rythme cardiaque comprend des capteurs capables de détecter des fluctuations affectant un champ bioélectrique sans contact avec la peau. Le module de communication (2) peut être combiné au module de surveillance du rythme cardiaque (1) pour former une attache pouvant être fixée sur les vêtements afin de fonctionner alors qu'elle se trouve au-dessus de la poitrine de l'utilisateur dans la région du cœur sans qu'il soit nécessaire d'utiliser une sangle de poitrine. Le module de communication est rechargé à partir du module de surveillance du rythme cardiaque pendant l'utilisation. Le module de communication peut être séparé du module capteur cardiaque et installé dans un support au niveau d'un bracelet. Le support (40) possède des extrémités incurvées auxquelles la sangle (3b) est fixée par un ressort (43), ce qui évite d'avoir besoin de crans ou autres éléments saillants sur le support. Le système génère un champ électrique à une fréquence égale à des centaines ou des milliers de fois la fréquence du champ cardiaque pour confirmer que les capteurs (12) sont bien sensibles au champ cardiaque. Un filtre actif est développé à partir d'un capteur de mouvement pour filtrer les signaux correspondant à une activité musculaire autre que cardiaque.
PCT/GB2016/054077 2015-12-24 2016-12-28 Système portatif de surveillance du rythme et de l'activité cardiaques WO2017109520A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB1522875.2A GB2545740A (en) 2015-12-24 2015-12-24 Heart rate and activity monitor system
GB1522875.2 2015-12-24
GB1600136.4 2016-01-05
GB1600136.4A GB2547631A (en) 2016-01-05 2016-01-05 Heart rate and activity monitor system filters
GBGB1613194.8A GB201613194D0 (en) 2016-01-05 2016-07-29 Heart rate and actively monitor system filters
GB1613194.8 2016-07-29

Publications (1)

Publication Number Publication Date
WO2017109520A1 true WO2017109520A1 (fr) 2017-06-29

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PCT/GB2016/054077 WO2017109520A1 (fr) 2015-12-24 2016-12-28 Système portatif de surveillance du rythme et de l'activité cardiaques

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WO (1) WO2017109520A1 (fr)

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CN108634947A (zh) * 2018-04-03 2018-10-12 阿木（深圳）新科技有限公司 用于服装上的信号处理器安装装置
CN111050636A (zh) * 2017-09-01 2020-04-21 雀巢产品有限公司 心率检测设备及相关系统和方法
WO2021179754A1 (fr) * 2020-03-09 2021-09-16 京东方科技集团股份有限公司 Récipient de dispositif de détection, dispositif de détection, système de détection et procédé d'utilisation de système de détection

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WO2001033245A1 (fr) * 1999-11-03 2001-05-10 Med-Dev Limited Procede et appareil d'essai d'un capteur capacitif
US20130131484A1 (en) * 2006-06-08 2013-05-23 Suunto Oy Snap and electrode assembly for a heart rate monitor belt
US20140051946A1 (en) * 2008-12-15 2014-02-20 Proteus Digital Health, Inc. Re-wearable wireless device
US20140200469A1 (en) * 2013-01-16 2014-07-17 University Of Rochester Non-contact electrocardiogram system
US8992433B1 (en) * 2004-09-28 2015-03-31 Impact Sports Technologies, Inc. Clothing with heart rate monitoring device
US20150272457A1 (en) * 2014-03-26 2015-10-01 GestureLogic Inc. System, method and device for detecting heart rate
US20150335283A1 (en) * 2013-12-31 2015-11-26 Samsung Electronics Co., Ltd. Electrocardiogram Watch Clasp

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Publication number Priority date Publication date Assignee Title
WO2001033245A1 (fr) * 1999-11-03 2001-05-10 Med-Dev Limited Procede et appareil d'essai d'un capteur capacitif
US8992433B1 (en) * 2004-09-28 2015-03-31 Impact Sports Technologies, Inc. Clothing with heart rate monitoring device
US20130131484A1 (en) * 2006-06-08 2013-05-23 Suunto Oy Snap and electrode assembly for a heart rate monitor belt
US20140051946A1 (en) * 2008-12-15 2014-02-20 Proteus Digital Health, Inc. Re-wearable wireless device
US20140200469A1 (en) * 2013-01-16 2014-07-17 University Of Rochester Non-contact electrocardiogram system
US20150335283A1 (en) * 2013-12-31 2015-11-26 Samsung Electronics Co., Ltd. Electrocardiogram Watch Clasp
US20150272457A1 (en) * 2014-03-26 2015-10-01 GestureLogic Inc. System, method and device for detecting heart rate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111050636A (zh) * 2017-09-01 2020-04-21 雀巢产品有限公司 心率检测设备及相关系统和方法
CN108634947A (zh) * 2018-04-03 2018-10-12 阿木（深圳）新科技有限公司 用于服装上的信号处理器安装装置
WO2021179754A1 (fr) * 2020-03-09 2021-09-16 京东方科技集团股份有限公司 Récipient de dispositif de détection, dispositif de détection, système de détection et procédé d'utilisation de système de détection

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