WO2017129725A1 - Dispositif et système de surveillance de pression artérielle - Google Patents

Dispositif et système de surveillance de pression artérielle Download PDF

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Publication number
WO2017129725A1
WO2017129725A1 PCT/EP2017/051726 EP2017051726W WO2017129725A1 WO 2017129725 A1 WO2017129725 A1 WO 2017129725A1 EP 2017051726 W EP2017051726 W EP 2017051726W WO 2017129725 A1 WO2017129725 A1 WO 2017129725A1
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WO
WIPO (PCT)
Prior art keywords
limb
blood pressure
monitoring device
sensing
radially inner
Prior art date
Application number
PCT/EP2017/051726
Other languages
English (en)
Inventor
Serge CHANCHOLE
Original Assignee
Digital For Mental Health
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
Application filed by Digital For Mental Health filed Critical Digital For Mental Health
Publication of WO2017129725A1 publication Critical patent/WO2017129725A1/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
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/02141—Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits
    • 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
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
    • A61B5/02233—Occluders 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
    • A61B5/681—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
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • 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
    • A61B5/026—Measuring blood flow
    • A61B5/0265—Measuring blood flow using electromagnetic means, e.g. electromagnetic flowmeter

Definitions

  • the instant invention relates to blood pressure monitoring devices and systems.
  • Pulse is an ancestrally known way to measure the heart rate. Pulse is typically measured by tactile palpation of an artery, most often at the wrist, but possibly in other places (ankle, arm, thigh, head, ...) .
  • the radial artery at the wrist is a convenient place for pulse measurement, because it is trapped between the radius bone and a neighbour tendon.
  • a wearable blood pressure monitoring device comprising a sensing portion and an attachment portion.
  • the sensing portion comprises a radially inner flexible film providing a radially inner surface of the sensing portion to face a wearer's limb.
  • the sensing portion further comprises a radially outer surface opposed to the inner surface.
  • the attachment portion is designed to be attached to the wearer's limb and tensed on the user's limb. It is connected to the sensing portion such that, with the attachment portion tensed, the radially inner surface comprises a base portion and a protrusion portion protruding radially inward with respect to the base portion, with both the base portion and the protrusion portion fitting the geometry of the hard tissues of the wearer's limb.
  • the sensing portion further comprising a sensor to sense blood pressure transmitted from the user limb through the protrusion portion.
  • the protrusion portion will be in close contact with the hard anatomical parts of the user limb, which will help ensuring the position of the device with respect to the artery, and hence ensure a more secure measurement of the blood pressure.
  • the blood pressure monitoring device comprises a radially outer portion comprising the radially outer surface of the sensing portion, and comprising a radially inner portion comprising the radially inner surface of the sensing portion,
  • the radially outer portion is stiffer than the radially inner portion
  • the radially inner portion comprises a main portion and localized portions at least in part of the protrusion portion, and wherein the localized portions are stiffer than the main portion;
  • the blood pressure monitoring device is an annular device designed to peripherally surround the user's limb;
  • the sensing portion is a first sensing portion
  • the radially inner surface, radially outer surface, base portion, protrusion portion and sensor are, respectively, a first radially inner surface, a first radially outer surface, a first base portion, a first protrusion portion and a first sensor
  • the device further comprising a second sensing portion, the second sensing portion comprises a second radially inner surface to face a wearer's limb, and a second radially outer surface opposed to the second radially inner surface,
  • the attachment portion is designed to be attached to the wearer's limb and tensed on the user's limb, and is connected to the second sensing portion such that, with the attachment portion tensed, the second radially inner surface comprises a second base portion and a second protrusion portion protruding radially inward with respect to the second base portion, with both the second base portion and the second protrusion portion fitting the geometry of the underlying hard tissues of the wearer's limb,
  • the second sensing portion further comprising a second sensor to sense blood pressure transmitted from the user limb through the second protrusion portion;
  • the first sensing portion and the second sensing portions are spaced from one another along a peripheral direction of the user's limb;
  • the senor is a first sensor, and the device further comprises a second sensor to sense blood pressure transmitted from the user limb through one of said protrusion portions;
  • the blood pressure monitoring device further comprises a tension setting device adapter to set a tension by which the attachment portion is to be tensed on the user's limb;
  • the sensing portion comprises a fluid-tight envelope defined at least partly by said radially inner film facing the wearer's limb, and comprising said radially inner surface, and a radially outer wall opposed to the inner film, and comprising said radially outer surface, the fluid-tight envelope defining an inner chamber filled with fluid; the sensor is in contact with the fluid to sense vibrations transmitted from the user limb through the protrusion portion of the radially inner film and the fluid;
  • the sensing portion comprises an optical detector adapted to detect blood-flow-dependent light properties, notably through spectrography and interferometry ;
  • the sensing portion comprises an electrical detector, notably a capacitive detector, adapted to detect blood-flow-dependent electrical properties;
  • the blood pressure monitoring device further comprises an interface to a processor programmed to handle data measured by the sensor.
  • the invention relates to a blood pressure monitoring system comprising a blood pressure monitoring device, and a processor programmed to handle data measured by the sensor and interfaced to said interface .
  • the invention relates to a method of monitoring blood pressure monitoring device using a blood pressure monitoring device comprising a sensing portion and an attachment portion connected to the sensing portion,
  • the sensing portion comprises a radially inner flexible film providing a radially inner surface of the sensing portion to face a wearer's limb, wherein the sensing portion further comprises a radially outer surface opposed to the inner surface,
  • the radially inner surface comprises a base portion and a protrusion portion protruding radially inward with respect to the base portion, with both the base portion and the protrusion portion fitting the geometry of the underlying hard tissues of the wearer's limb,
  • Fig. 1 is a schematic view of an embodiment of the invention into a wristband
  • Fig. 2 is a perspective view of the wristband of Fig. 1,
  • Fig. 3 is a general sectional view of the embodiment of Fig. 1,
  • Fig. 4 is a view of a detail of Fig. 3,
  • Figs. 5-7 are partial views, along the same cross- section as Fig. 4 for variant embodiments,
  • Fig. 8 is a cross-sectional view of the band according to an embodiment
  • Fig. 9a is a view similar to Fig. 8 according to another embodiment
  • Fig. 9b is a partial perspective cross-sectional view of the embodiment of Fig. 9a
  • Figs. 10a and 10b are views corresponding to Figs. 9a and 9b for another embodiment
  • Fig. 11 is a view similar to Figs. 9b or 10b for another embodiment
  • Figs. 12 and 13 are views similar to Fig. 8 for other embodiments.
  • Figs. 14, 15, 16 and 17 are views similar to Fig. 3 for other embodiments,
  • Figs. 18a and 18b are views similar to Fig. 1 for other embodiments,
  • Fig. 19a is a schematic view similar to Fig. 3 for another embodiment, illustrating a tension setting device in a first condition
  • Fig. 19b is a view similar to Fig. 19a in a second condition of the tension setting device
  • Fig. 20 is a similar view of an alternative embodiment of the tension setting device
  • Fig. 21 is a schematic view of the sensing system
  • Figs. 22, 23 are views similar to Fig. 4 of alternative sensing technologies.
  • Fig. 1 schematically shows an embodiment of a monitoring device 1 according to the invention.
  • the monitoring device 1 is worn by the user.
  • the monitoring device 1 is worn by the user at a wrist.
  • the present description is performed with respect to the left wrist of the user, as shown.
  • Fig. 3 is a typical sectional view through the left wrist of the user. Fig. 3 is presented with the back of the hand facing upward.
  • the radius 2 and ulna 3 are schematically represented, as well as the skin 4 of the patient.
  • the ulnar artery 5 which is close to the ulna 3
  • the radial artery 6 which is close to the radius.
  • the radial artery 6 passes between the brachioradialis muscle tendon 7, the flexor carpi radialis muscle tendon 8 and by the pronator quadratus muscle 9, which together define a rigid channel for the radial artery 6.
  • the monitoring device 1 can be embodied as a band which extends continuously around the whole periphery of the wrist.
  • the device has a radially inner surface 10a and a radially outer surface 10b which is opposite to the radially inner surface 10a.
  • the monitoring device 1 comprises a sensing portion 11 and an attachment portion 12.
  • the attachment portion 12 attaches the monitoring device 1 to the user's limb.
  • the attachment portion 12 attaches the monitoring device 1 to the user limb by surrounding in a tight manner the user's limb, in the manner of a wristband.
  • the sensing portion 11 senses the blood pressure.
  • the device will be called a blood pressure monitoring device. This does not mean that the device is able, by itself, to explicitly determine the blood pressure. It could for example determine a blood pressure-related parameter, such as blood pressure variation with time, or the like.
  • sensing portion 11 A detailed example of the sensing portion 11 will be provided below with reference to Fig. 4.
  • the sensing portion 11 is presented facing the radial artery 6.
  • the sensing portion When the monitoring device is fitted on the user's limb, the sensing portion fits tightly the geometry of the user's limb, especially that of the internal hard structures, such as the bones, muscles and tendons.
  • the sensing portion comprises a flexible film 53, which is provided radially inward. Hence, the radially inner surface of this film 53 forms the radially inner surface 10a of the sensing portion 11.
  • the radially inner surface 10a comprises a base portion 15 and a protrusion portion 16 protruding radially inward with respect to the base portion 15.
  • protruding it is meant that the base portion defines a smooth geometrical surface roughly corresponding to the overall outer geometry of the user's limb, and that the protrusion portion 16 protrudes from this ideal geometry.
  • the overall geometry of the base portion 15 fits that of the limb of the user.
  • the protrusion portion 16 fits the geometry of the underlying hard tissues of the wearer's limb, and can in general be pressed facing the radial artery 6 into the anatomical recess defined between the brachioradialis muscle tendon 7, the flexor carpi radialis muscle tendon 8 and by the pronator quadratus muscle 9.
  • the flexible film 53 is provided with high deformation capacity in order to be able to accommodate the underlying geometry of the user's limb.
  • the radially inner portion of the sensing portion is highly flexible, has a controlled shape and stiffness so as to apply controlled pressure on the user's limb. This enables a controlled, tight, reliable and constant contact of the device with the user's limb.
  • the device may exhibit such a protrusion portion 16.
  • the device at rest, the device will not exhibit such a protruding portion, and will have a smooth surface.
  • the protrusion will appear when the device is tensed on the user's limb, because the device will adapt to the user's limb underlying geometry. This ensures a proper wear of the device, because, however the device is worn, it ensures the protrusion to be located where it should. The user can freely move while continuing to have the device operative.
  • the sensing portion 11 further comprises a sensor to sense blood pressure.
  • the sensor thus operates as a pressure sensor or pressure transducer.
  • the sensor can comprise a vibration sensor 17 to sense blood pressure transmitted from the user limb through the protrusion portion 16.
  • the vibration sensor 17 is shown comprising a sensor array comprising two individual sensors 17a and 17b.
  • the vibration sensor may comprise one single individual vibration sensor, or more than two individual vibration sensors, for example. Using two individual vibration sensors rather than one may improve the overall signal-to-noise ratio of the sensor 17, for an acceptable bulk. More sensors may further improve this signal-to-noise ratio but may be detrimental to the wearability of the monitoring device.
  • the blood pulse is transmitted to the sensor 17 through fluid.
  • the monitoring device comprises a chamber 18 defined by a fluid-tight envelope 19 and filled with fluid 20.
  • the film 53 forms part of this envelope 19, in particular the radially inward wall of the envelope 19.
  • the fluid is for example a suitable liquid or gel, preferably incompressible, of dynamic viscosity comprised between 0.5 and 1 milliPascal . second (mPa.s), such as, for example, water, ethanol, or inert organic liquids, such as silicone oils (for example polydimethylsiloxanes ) .
  • the sensor 17 is comprised within the chamber 18.
  • the senor 17 may be attached to the chamber wall so that its active detection portion is within the fluid.
  • the monitoring device comprises an inner wall 13 and an opposed outer wall 14 which are part of the fluid-tight envelope 19.
  • the inner wall 13 faces the user's limb.
  • the radially inner surface 10a is that of the inner wall 13.
  • the radially outer surface 10b can be that of the outer wall 14.
  • the monitoring device is tightened on the user's limb, and the protrusion portion 16 is maintained in close contact with the user's skin facing the radial artery 6.
  • the envelope 19 is filled with fluid so that heart-beat- induced movement of the artery is transmitted through user tissue, inner wall 14 and fluid 20 to the sensor 17.
  • the sensor comprises a microphone adapted to detect these movements.
  • the sensor comprises a hydrophone designed to detect these movements inside the fluid. Any movement detection sensor can be used.
  • the radially outer portion 21 (and especially for example the outer wall 14) is stiff, i.e.
  • the fluid thus has a double function. First, it flows so that the space between the radially outer portion and the radial artery 6 is filled with material (other than air), including anatomical structures (skin), the inner wall, which is highly flexible, and the fluid itself. Second, it conveys the deformation occurring at the artery due to blood flow to the sensor 17.
  • the inner wall 13 may have portions of different stiffness.
  • the radially inner portion comprises a main portion and localized portions (part of the protrusion portion may comprise one localized portion) , and the localized portions are stiffer than the main portion. This helps ensuring the shape of the protrusion portion 16 as discussed above. Stiffer localized portions are for example provided at the junction between the base portion and the protrusion portion to ensure the protrusion portion maintains a protruding shape even though the constituting material of the inner wall is highly flexible .
  • Suitable materials for the band, and especially for the inner wall 13, include elastomers.
  • a natural rubber with an elasticity modulus of about 1 to 20 MegaPascals (MPa) is believed suitable.
  • Another example comprises synthetic rubbers.
  • a typical example could be terpolymers of ethylene, propylene and a diene component, such as EPDM.
  • Another example comprises polyurethane .
  • Shore A hardness 20-80;
  • Elasticity modulus 1-20 MPa, preferably 2-10 MPa.
  • Another example comprises silicone.
  • the radial inner surface 10a may be textured in order to improve the passage of air and/or liquid (sweat, %) at the skin under the band.
  • Fig. 5 now shows another embodiment of the invention.
  • Fig. 5 is on a larger scale than Fig. 4 and, as can be seen on Fig. 5, the monitoring device comprises a protrusion portion 16 and an additional protrusion portion 116 which are spaced apart from one another along the circumferential direction of the device (and of the user's limb) .
  • protrusion portion 16 Having two circumferentially spaced apart protrusion portions 16, 116 enable to wear the monitoring device either on the left wrist as discussed above, where the protrusion portion 16 is facing the radial artery 6, or on the right wrist, where the protrusion portion 116 is facing the radial artery 6.
  • the protrusion portion 116 when worn on the left wrist, the protrusion portion 116 is facing the ulnar artery 5, which may provide further information as to blood flow.
  • the sensor 7 may comprise more than two individual sensors such as, in the present case, three individual sensors 17a, 17b, 17c.
  • the individual sensors can be placed so that the monitoring device may provide relevant information both when worn on the left wrist and on the right wrist. As shown, the device is symmetric with respect to a longitudinal plane of the user's limb.
  • the individual sensors may be placed so as to sense heart-beat-induced movements from both the radial artery and the ulnar artery.
  • Figs. 6 and 7 show two embodiments alternative to Fig. 5 with two protrusion portions 16, 116.
  • the chamber 18 comprises two individual chambers 18a, 18b communicating with one another through a channel 22. Having a single chamber 18 enables to control the pressure of the fluid inside the chamber, and hence the transmission of the heart-beat-induced movements to the sensor 17.
  • one sensor can be provided in each respective individual chamber 18a, 18b.
  • Fig. 7 has a similar configuration to that of Fig. 6.
  • the channel 22 is formed within the band. This reduces the risk of accidentally closing the channel 22 by deformation of its wall.
  • One other difference is that it uses a single sensor 17, which is provided in the channel 22 and offset from the individual chambers 18a, 18b.
  • the individual chambers may have any cross-sectional shape, such as circular, elliptic, rectangular, ... and oriented either along or perpendicularly to the peripheral direction of the band.
  • Fig. 8 now is a cross-sectional view of the monitoring device along lines VIII-VIII of Fig. 1, i.e. transversely to the above-described sectional views.
  • the radially inner portion 23 and the radially outer portion 21 are made from the same material, and the radially outer portion 21 is made stiffer by being thicker.
  • Fig. 9a now shows an alternative embodiment, where the radially inner portion comprises stiffening ribs 24 which extend along the peripheral direction of the user's limb. These ribs 24 are provided on the radially outer surface 25 of the radially inner portion 23 ("inner” and “outer” being defined radially with respect to the centre of the user's limb) .
  • Fig. 10a now shows an alternative embodiment, where the radially inner portion comprises stiffening ribs 26 which extend along the user's limb longitudinal direction. These ribs 26 are provided on the radially outer surface 25 of the radially inner portion 23.
  • Fig. 11 schematically shows a portion of a monitoring device comprising both longitudinal ribs 26 and peripheral ribs 24.
  • the longitudinal ribs 26 and the peripheral ribs 24 are provided around the whole chamber.
  • the ribs may but on one another in case of high deformations of the band, in order to prevent even higher deformation. Other embodiments are possible.
  • the monitoring device may comprise a stiff core material 27 embedded (for example by overmolding) into a more flexible material 28.
  • the core material 27 provides increased stiffness where it is desired .
  • Fig. 13 now shows an alternative embodiment to Fig. 8.
  • the monitoring device may comprise a highly deformable region 29, which is for example provided with bellows joining the radially inner surface 10a to the radially outer surface 10b.
  • Fig. 14 now shows an alternative embodiment of a monitoring device.
  • Fig. 14 is a sectional view similar to Fig. 3.
  • the embodiment of Fig. 14 differs from the embodiment of Fig. 3 in that the monitoring device comprises a plurality of thick portions 30 connected to one another by linking portions 31.
  • the thick portion 30 facing the radial artery 6 may comprise a sensing portion as described above.
  • the thick portion 30 facing the ulnar artery 5 may comprise a sensing portion as described above. If there are additional thick portions 30 (in the present example, there are two additional thick portions, however, this number could either be 0 (see for example Fig. 16), 1 (see for example Fig. 17), or more than two), they may not comprise a sensing portion as described above.
  • the thick portions 30 which do not comprise a sensing portion may not comprise any protrusion portion, so as to offer a fool- proofing system providing an indication as to how to properly wear the monitoring device.
  • the linking portions 31 may comprise an elastic material enabling the monitoring device to be stretched (by stretching the linking portions 31) to be passed along the hand up to the wrist of the user.
  • the attachment portion may not totally surround the user's limb.
  • the monitoring device may surround only about 75% of the user's limb.
  • the monitoring device may still hold on the user's wrist through elasticity of its constituents.
  • the monitoring device may hold on the user's wrist by adhesive.
  • the monitoring device may surround less than 75% of the user's limb, and it could even extend only above the radial artery 6 and closely around that area.
  • the body of the monitoring device is designed here using the term "band", even if, in some embodiments, it not necessarily an elongated device.
  • Fig. 16 may comprise three materials of different stiffness.
  • the material in contact with the skin in the sensing portion is the most flexible, whereas the material backing the chambers 18 is the stiffest.
  • the linking portion 31 can be provided intermediately stiff, so as to enable wearing the band comfortably.
  • the monitoring device may comprise an additional sensing portion, such that the sensing portions are spaced apart along the longitudinal direction of the user's limb.
  • the sensing portions are spaced apart along the longitudinal direction of the user's limb along the same artery, such as notably the radial artery.
  • Fig. 18a shows such an embodiment, comprising a first peripheral band 32 as described above, a second peripheral band 33 as described above, spaced apart from the first peripheral band 32 along the user's arm, and a linking portion 31 linking the two peripheral bands 32, 33 together.
  • blood flow velocity in the artery may be calculated by the computation circuit based on the known distance between the two bands and the measured time of the pulse at each band.
  • peripheral bands 32, 33 are directly linked to one another.
  • the tension of the monitoring device i.e. the force it applies on the user's limb can not be set.
  • the force the monitoring device applies on the user's limb will depend on the diameter of the user's limb.
  • the tension of the monitoring device could be set, using a tension setting device .
  • the volume of the chamber 18 may be decreased, thereby increasing the fluid's pressure inside the chamber.
  • a slider 35 which slides along the peripheral direction of the band 32. As can be seen on Fig. 19a, the slider 35 is away from the chamber 18, so that the full volume of the chamber 18 can be filled with the fluid, thereby offering the minimum pressure inside the chamber.
  • the slider 35 is moved to a setting configuration where it closes a portion of the chamber 18, so that the volume thereof which can receive fluid is reduced and the pressure inside the chamber is increased .
  • the slider 35 can be maintained in any of a suitable number of positions by any adapted means, such as for example by teeth engagement as shown. Other embodiments are possible .
  • Fig. 20 shows yet another embodiment by which the diameter of the band 32 can be set, whereby the tension applied on a given user's limb can be set. This can be performed outside the region of the chamber 18, as shown.
  • Fig. 21 now schematically shows a diagrammatic view of the sensing equipment 36.
  • the equipment 36 may comprise a power supply 37 such as a battery, which provides power to the components which need it, such as the sensor 17.
  • the signal measured by the sensor can be treated electronically, for example by being amplified by an amplifier 38 and digitized by a digitizer 39.
  • a computation circuit 40 can be used to perform various treatments to the digitized data, such as filtering and/or storing. Treated data can be communicated for further treatment or storage.
  • the above components are provided within the band 32, which comprises an interface such as a connecting device 41 to periodically connect the band 32 with an outer device (not shown) which can handle more detailed calculation or more storage.
  • the band 32 comprises a wireless connection module 42 to wirelessly connect the band 32 to a remote outer device (not shown) which can handle more detailed calculation or more storage.
  • Wire-less connection offers less burden for the user, and reduces the risk of missing relevant data.
  • the system may also comprise a signalling device, such as a LED 52, which is lit when the computation circuit achieves suitable calculation, thereby indicating that the monitoring device is correctly worn.
  • a signalling device such as a LED 52, which is lit when the computation circuit achieves suitable calculation, thereby indicating that the monitoring device is correctly worn.
  • the heart beat produces a change of diameter of the artery with the passage of the blood flow.
  • the blood pressure converts into this change of diameter, which itself can be measured by being mechanically conveyed to the sensor 17.
  • the above description provides an example of sensor which is believed to be particularly well suited for the application.
  • the sensor senses movement, which is induced by the passage of a blood pulse in the artery, either a movement amplitude, a noise or a vibration.
  • movement which is induced by the passage of a blood pulse in the artery, either a movement amplitude, a noise or a vibration.
  • One other sensing technology is an optical technology, whereby, at the artery, the material of the band (as well as the material of the fluid or gel) is at least partially translucent to some part of the optical spectrum (for example visible and/or (near or far) infra-red and/or ultra-violet) .
  • the monitoring device comprises an emitter 43 which emits an optical signal toward the artery through the band material, and a detector 44 which detects the reflected light signal.
  • the tight contact between the band and the skin enables a precise positioning of the optical components with respect to the user's artery, and high reproducibility of the measurements.
  • one may also measure heart beat, and/or oxygen rate in the artery, in addition to blood pressure.
  • the sensing portion may additionally comprise additional optical properties. For example, it may be designed to polarize or filter light, so as to filter out irrelevant light signals.
  • One option is to structure the sensing portion to provide these additional optical properties.
  • the sensing portion can be structured into a lens (for example a Fresnel lens), to focus or guide light.
  • the detector 44 may comprise a spectrometer or interferometer. For example, one may consider using a birefringent material such that light refraction through the material varies when a pulse occurs in the artery. This variation can be measured by the detector 44.
  • Another example uses a plurality of gratings 45, 46, which are deformed differently when a pulse occurs in the artery, for being embedded in the band in locations subjected to different deformations when a pulse occurs (for example, one close to the skin, and the other one further away from the user's skin) . Pulse occurrence can thus be detected by interferometry at the detector 44.
  • the sensing portion may comprise a portion made of a piezo-electrical material adapted to generate an electric current upon deformation, and can thus provide information as to blood-flow induced movements.
  • a suitable sensor may include a film of piezoelectric PVDF .
  • the sensing portion may comprise an electrode adapted to detect an electric current.
  • an electricity- conductive elastomer such as a charged silicone. Carbon- charged, nickel/graphite charged-, or silver/aluminium charged- silicones can be considered.
  • a capacitive sensor 47 can be provided in the sensor portion.
  • the capacitive sensor 47 may comprise two electrodes 49, 50 in contact with the skin such as described above.
  • the sensor 47 is connected to the electronic component through wires 51.
  • the electrodes 49, 50 are for example spaced apart, or concentric as shown. This sensor 47 can detect blood pulsation by rheography or measuring electrical conductivity in the surfacic layers of the user's body.
  • Additional electrodes may be used to detect other electrical signals of the user, such as electrocardiogram or electromyogram .
  • the detected signal may be used in a broad range of applications.
  • One application is the monitoring of mental suffering .

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
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  • Engineering & Computer Science (AREA)
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  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

La présente invention concerne un dispositif de surveillance de pression artérielle portable comportant une partie de détection (11) et une partie de fixation (12). La partie de détection (1) comprend un film flexible radialement interne (53) pour faire face à un membre de l'utilisateur. Avec la partie de fixation (12) tendue sur le membre de l'utilisateur, la surface radialement interne (10a) comprend une partie de base (15) et une partie saillante (16), qui correspondent toutes deux à la géométrie des tissus durs sous-jacents du membre de l'utilisateur. La partie de détection (11) comprend un capteur (17) pour détecter la pression artérielle transmise depuis le membre de l'utilisateur par l'intermédiaire de la partie saillante (16).
PCT/EP2017/051726 2016-01-28 2017-01-27 Dispositif et système de surveillance de pression artérielle WO2017129725A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111565630A (zh) * 2018-01-15 2020-08-21 欧姆龙株式会社 血压测量装置

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Publication number Priority date Publication date Assignee Title
US20020026121A1 (en) * 1999-04-21 2002-02-28 Jie Kan Noninvasive blood pressure measuring method and apparatus
US6443906B1 (en) * 2000-10-09 2002-09-03 Healthstats International Pte Ltd. Method and device for monitoring blood pressure
US20150313542A1 (en) * 2014-05-01 2015-11-05 Neumitra Inc. Wearable electronics
WO2016003268A2 (fr) * 2014-06-30 2016-01-07 Scint B.V. Procédé et dispositif pour mesurer un état de santé et des paramètres physiologiques d'un utilisateur au repos et en mouvement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020026121A1 (en) * 1999-04-21 2002-02-28 Jie Kan Noninvasive blood pressure measuring method and apparatus
US6443906B1 (en) * 2000-10-09 2002-09-03 Healthstats International Pte Ltd. Method and device for monitoring blood pressure
US20150313542A1 (en) * 2014-05-01 2015-11-05 Neumitra Inc. Wearable electronics
WO2016003268A2 (fr) * 2014-06-30 2016-01-07 Scint B.V. Procédé et dispositif pour mesurer un état de santé et des paramètres physiologiques d'un utilisateur au repos et en mouvement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111565630A (zh) * 2018-01-15 2020-08-21 欧姆龙株式会社 血压测量装置
CN111565630B (zh) * 2018-01-15 2023-05-02 欧姆龙株式会社 血压测量装置

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