CN209252845U - Pulse detecting device - Google Patents
Pulse detecting device Download PDFInfo
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- CN209252845U CN209252845U CN201821232213.7U CN201821232213U CN209252845U CN 209252845 U CN209252845 U CN 209252845U CN 201821232213 U CN201821232213 U CN 201821232213U CN 209252845 U CN209252845 U CN 209252845U
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Abstract
The utility model embodiment discloses a kind of pulse detecting device, the device includes: piezoelectric sensing layer, the piezoelectric sensing layer includes flexible piezoelectric electret film, and two metal electrodes of the flexible piezoelectric electret film upper and lower surfaces are respectively arranged on, two metal electrode is used for the output charge amount variable quantity when deformation occurs for the flexible piezoelectric electret film；DPA data processing activity, the DPA data processing activity is used to connect two metal electrode to receive the quantity of electric charge variable quantity of the two metal electrodes output, and potential change amount is determined according to the quantity of electric charge variable quantity, and the potential change amount is sent to data receiving terminal.It solves the pulse detecting device of the prior art technical problem complex there are structure, has reached the technical effect for reducing the structure complexity of pulse detecting device.
Description
Technical field
The utility model embodiment is related to medical instruments field more particularly to a kind of pulse detecting device.
Background technique
Arterial pressure will be made to become larger when a large amount of blood enter artery and expand caliber, can experienced at the shallower place of body surface
The expansion of artery, that is, so-called pulse.As the information carrier closely bound up with cardiovascular activity, pulse wave contains pole
Cardiovascular system pathology abundant, physiologic information, these information facilitate the diagnostic analysis of physical condition.
Pulse wave signal detection technique has obtained developing on a large scale very much in recent decades, in existing pulse wave detection technique, "
Arteries and veins finger pressure " method, not scientific data, and the pressure change of finger tip is affected to signal acquisition, easily causes tail dry
It disturbs；Pulse wave, system structure complexity, higher cost are obtained using photoelectric sensor detection blood oxygen variation, then by respective algorithms
And it is more demanding to algorithm；Using resistance strain gage and bridge circuit, structure is also more complex.Pressure drag material is generally pressure-sensitive electricity
Resistance obtains pressure information by the variation of material resistance under measurement stress condition, still falls within indirect measurement, precision and sensitive
Degree is not high, and especially dynamic property is bad, is suitable only for the measurement of slowly varying power.
In conclusion the technical problem that the pulse detecting device of the prior art is complex there are structure.
Utility model content
The utility model embodiment provides a kind of pulse detecting device, is deposited with solving the pulse detecting device of the prior art
In the complex technical problem of structure.
In a first aspect, the utility model embodiment provides a kind of pulse detecting device, comprising:
Piezoelectric sensing layer, the piezoelectric sensing layer includes flexible piezoelectric electret film, and is respectively arranged on the flexibility
Two metal electrodes of piezo-electric electret thin film upper and lower surfaces, two metal electrode are sent out in the flexible piezoelectric electret film
Output charge amount variable quantity when raw deformation；
DPA data processing activity, the DPA data processing activity receive the two metals electricity for connecting two metal electrode
The quantity of electric charge variable quantity of pole output, and potential change amount is determined according to the quantity of electric charge variable quantity, and the potential is become
Change amount is sent to data receiving terminal.
Further, the flexible piezoelectric electret film is single layered porous film, or by multilayer porous film by parallel or
Series system is formed by stacking.
Further, the DPA data processing activity includes flexible circuit board, and the knob connecting with the flexible circuit board
Detain battery.
Further, further includes:
The flexible accommodating chamber being adapted with the piezoelectric sensing layer shape, the flexibility accommodating chamber is open at one end, for holding
Receive the piezoelectric sensing layer；
Shielded layer, the shielded layer are the metal layer for being set to the flexible accommodating chamber outer surface, and described with being set to
The cathode of the button cell between shielded layer and the flexible accommodating chamber is connected.
Further, the flexible accommodating chamber includes concavity curved-surface structure, to be converged to pulse signal collected,
To realize the amplification of the pulse signal.
Further, further includes:
Two protective layers are the flexible filling of the piezoelectric sensing layer upper and lower surfaces in the flexible accommodating chamber
Object, and it is set to the protective layer of piezoelectric sensing layer lower surface, for pulse signal to be transferred to institute from human skin surface
Piezoelectric sensing layer is stated, and realizes the impedance matching of pulse signal transmission path and the piezoelectric sensing layer.
Further, further includes:
Insulating thin layer, the insulating thin layer be set to the piezoelectric sensing layer towards at pulse detection one side with
Between the protective layer.
Second aspect, the utility model embodiment additionally provide a kind of production of pulse detecting device described in first aspect
Method, comprising:
The flexible piezoelectric electret film of preset shape is obtained, and in the upper and lower table of the flexible piezoelectric electret film
A metal electrode is respectively set in face, to export the flexible piezoelectric electret film when deformation occurs by the metal electrode
The quantity of electric charge variable quantity of generation；
The metal electrode is connected with DPA data processing activity, so that the DPA data processing activity passes through the metal electricity
Pole obtains the quantity of electric charge variable quantity that the flexible piezoelectric electret film is generated when deformation occurs, and according to the quantity of electric charge
Variable quantity determines potential change amount, and the potential change amount is sent to data receiving terminal.
Further, the flexible piezoelectric electret film for obtaining preset shape, and it is thin in the flexible piezoelectric electret
A metal electrode is respectively set in the upper and lower surfaces of film, to export the flexible piezoelectric electret film by the metal electrode
After the quantity of electric charge variable quantity generated when deformation occurs, further includes:
The flexible accommodating chamber adaptable with the shape of the piezoelectric sensing layer is obtained, to accommodate the piezoelectric sensing layer；
In the outer surface of the flexible accommodating chamber, shielded layer is set, and make the shielded layer and be set to the shielded layer with
The cathode of the button cell of DPA data processing activity between the flexibility accommodating chamber is connected, wherein the shielded layer is metal layer.
Further, the acquisition flexible accommodating chamber adaptable with the shape of the piezoelectric sensing layer, to accommodate the pressure
Electric sensing layer, comprising:
Obtain the flexible accommodating chamber adaptable with the shape of the piezoelectric sensing layer；
Protective layer is respectively set in the upper and lower surfaces of the piezoelectric sensing layer, by being set under the piezoelectric sensing layer
Pulse signal is transferred to the piezoelectric sensing layer from human skin surface by the protective layer on surface, and realizes pulse signal transmission
The impedance matching in path and the piezoelectric sensing layer；
The piezoelectric sensing layer that upper and lower surfaces are provided with the protective layer is fixed in the flexible accommodating chamber.
Further, the surface packing protective layer in the piezoelectric sensing layer, comprising:
Insulating thin layer is set towards the one side at pulse detection in the piezoelectric sensing layer, to obtain composite layer；
In the outer surface packing protective layer of the composite layer；
The piezoelectric sensing layer that the protective layer will be enclosed with is fixed in the flexible accommodating chamber, comprising:
The composite layer for being enclosed with the protective layer is fixed in the flexible accommodating chamber.
The technical solution of pulse detecting device provided by the embodiment of the utility model, including piezoelectric sensing layer and data processing
Mechanism, piezoelectric sensing layer include flexible piezoelectric electret film, and are respectively arranged on flexible piezoelectric electret film upper and lower surfaces
Two metal electrodes, two metal electrodes be used for when deformation occurs for flexible piezoelectric electret film output charge amount variable quantity；Number
It is used to connect two metal electrodes to receive the quantity of electric charge variable quantity of two metal electrodes output, and according to the quantity of electric charge according to processing mechanism
Variable quantity determines potential change amount, and potential change amount is sent to data receiving terminal.By in flexible piezoelectric electret
Film two sides setting metal electrode makes piezoelectric sensing layer have flexibility, thus make pulse detecting device that there is flexibility, it can be more preferable
It is bonded at ground and pulse detection, while greatly reducing the structure complexity of detection device compared with the existing technology, be conducive to mention
The accuracy of high pulse signal detection.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used does one and simply introduces, it should be apparent that, the accompanying drawings in the following description is some implementations of the utility model
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the pulse detecting device that the utility model embodiment one provides；
Fig. 2 is the structural schematic diagram for the another pulse detecting device that the utility model embodiment one provides；
Fig. 3 is the structural schematic diagram for the another pulse detecting device that the utility model embodiment one provides；
Fig. 4 is the structural schematic diagram for the Wrist belt-type pulse detecting device that the utility model embodiment one provides；
Fig. 5 is the flow chart of the production method for the pulse detecting device that the utility model embodiment two provides.
Specific embodiment
To keep the purpose of this utility model, technical solution and advantage clearer, implement hereinafter with reference to the utility model
Attached drawing in example, clearly and completely describes the technical solution of the utility model by embodiment, it is clear that described implementation
Example is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
Embodiment one
Fig. 1 is the structural schematic diagram for the pulse detecting device that the utility model embodiment one provides.The technology of the present embodiment
Scheme is suitable for the case where based on piezoelectric transducer detection pulse, is specially adapted to the feelings based on flexible piezoelectric thin film testing pulse
Condition.As shown in Figure 1, the pulse detecting device includes: piezoelectric sensing layer 11 and DPA data processing activity 12, piezoelectric sensing layer 11 includes
Flexible piezoelectric electret film 110, and it is respectively arranged on two metal electrodes of 110 upper and lower surfaces of flexible piezoelectric electret film
111, two metal electrodes 111 are used for the output charge amount variable quantity when deformation occurs for flexible piezoelectric electret film 110；At data
Reason mechanism 12 is used to connect quantity of electric charge variable quantity of two metal electrodes 111 to receive the output of two metal electrodes 111, and according to electricity
Lotus amount variable quantity determines potential change amount, and potential change amount is sent to data receiving terminal.
Wherein, flexible piezoelectric electret film 110 be made of piezo-electric electret one layer include a large amount of honeycomb structures
The closed film in hole, i.e. perforated membrane are deposited with a large amount of positive and negative charge in the upper and lower surfaces of hole respectively；Flexible piezoelectric electret
Body thin film can also be superimposed and form by way of in parallel or series for multilayer porous film, to enhance sensitivity.Wherein, piezoelectricity
Electret is non-polar polymer, mainly with polypropylene (Polypropylene, PP) for raw material, is also had based on poly- to benzene two
Formic acid glycol ester (Polyethylene terephthalate, PET), polyethylene naphthalate (Polyethylene
Naphthalate, PEN) etc. other polymer materials.The characteristics of piezo-electric electret has: 1), (tens arrive several hundred millis to light weight
Gram), thickness it is thin (tens arrive several hundred microns)；2), soft, bent, machinability is strong；3), high sensitivity, up to 600pC/N；
4), substantially without pyroelectric effect, its sensitivity is influenced by temperature smaller in operating temperature range；5), to vertical direction
Power is sensitive, insensitive to the shearing force of horizontal direction, is very suitable to detection positive pressure without being influenced by material buckles；6),
The linearity of piezoelectric response is good；7), lower cost for material.
In order to rapidly and accurately detect pulse signal, upper and lower surfaces of the present embodiment in flexible piezoelectric electret film 110
It is respectively arranged with metal electrode 111, to obtain the charge variation that flexible piezoelectric electret film 110 is generated when deformation occurs
Amount；In order to preferably measure the charge variation amount that the flexible piezoelectric electret film of piezoelectric sensing layer is generated when deformation occurs,
Two metal electrodes of the present embodiment are provided with pin 112.That is the gold of flexible piezoelectric electret film 110 and its upper and lower surfaces
The pin 112 for belonging to electrode 111 and two metal electrodes forms a piezoelectric sensing layer 11, that is, piezoelectric transducer (power-electricity
Switching mechanism).Certainly, in order to improve the signal-to-noise ratio of acquired electric signal, charge amplifier usually is set in DPA data processing activity,
To which the quantity of electric charge variable quantity of two metal electrodes output is converted to potential change amount.
Under pressure, the porous structure of flexible piezoelectric electret film 110 is compressed, internal electric dipole moment density hair
Changing causes the compensation charge in the metal electrode of its upper and lower surfaces to change, and force signal is converted into electric signal；Do not having
There is the white space of metal electrode, then can not acquire compensation charge, therefore do not have power-electricity transfer capability, does not constitute piezoelectricity biography
Sensor.
Wherein, flexible piezoelectric electret film 110 is preferably cut to circle, and it is thin which facilitates flexible piezoelectric electret
Film is bonded with accommodating chamber, is especially bonded with flexible accommodating chamber.
Wherein, DPA data processing activity 12 includes flexible circuit board, and the button cell being connected with the flexible circuit board,
Flexible circuit board connects the pin 112 of two metal electrodes 111, to receive two metal electrodes 111 in flexible piezoelectric electret film
The quantity of electric charge variable quantity generated when 110 deformation, and potential change amount is determined according to quantity of electric charge variable quantity, and by wired or wireless
Potential change amount is sent to data receiving terminal by communication mode.Specifically, 110 upper and lower surfaces of flexible piezoelectric electret film
Metal electrode 111 connect flexible circuit board by connecting the conducting wire of respective pin 112 respectively, and connect leading for two pins 112
Line position is not overlapped, therefore conductor area does not generate additional signal, and the signal that will not be generated to piezoelectric sensing layer brings interference.
Wherein, preferably potential change amount is sent to data to the DPA data processing activity of the present embodiment by mode by wireless communication
Receive terminal.Data receiving terminal can be dedicated pulse data receiving device, be also possible to the smart machines such as mobile phone.
Further, which further includes the flexible accommodating chamber 13 being adapted with piezoelectric sensing layer shape, soft
Property accommodating chamber 13 is open at one end, for accommodating piezoelectric sensing layer 11.The inside of flexible accommodating chamber 13 is concavity curved-surface structure, flexible
The overall structure of accommodating chamber 13 is similar to cake, helps to collect the pulse energy of measurement to facilitate detection, can also rise
To certain shielding action, interference of the extraneous noise to pulse signal collected is prevented, and then enhances the signal-to-noise ratio of signal.
Illustratively, flexible accommodating chamber is integrally similar to " auscultation head ", or the longitudinal section of flexible accommodating chamber is parabola shaped.
In order to reduce the interference of outer bound pair pulse detecting device, and the accuracy of raising testing result, flexibility receiving
The outer surface of chamber 13 is additionally provided with shielded layer 14, and DPA data processing activity 12 and its button cell be set to flexible accommodating chamber 13 with
In interlayer between the shielded layer 14, the cathode of button cell is connect with shielded layer 14, so that the current potential and button of shielded layer 14
The cathode potential of battery is identical.The shielded layer of the present embodiment is metal layer, and preferably copper foil layer
Specifically, the outer surface of flexible accommodating chamber 13 is wrapped in one layer of uniform copper foil, covers outside entire flexible accommodating chamber
Surface and edge, and the metal electrode of piezoelectric sensing layer upper surface, lower surface metal electrode and DPA data processing activity
Forming circuit.Metal enclosure is formd on the outside of entire piezoelectric sensing layer in this way, to form electromagnetic shielding, is reduced dry
It disturbs.
Further, which further includes two layers of protective layer 15 as made by flexible filler, and two protect
Sheath 15 is respectively arranged at the upper and lower surfaces of piezoelectric sensing layer 11, to wrap up entire piezoelectric sensing layer 11.Two protective layers 15 are full of
Entire flexibility accommodating chamber 13 helps to protect so that piezoelectric sensing layer 11 be made to be fixed in flexible accommodating chamber 13 by protective layer 15
Piezoelectric sensing layer 11 is protected, the abrasion of piezoelectric sensing layer 11 is prevented.In addition, being set to the protective layer 15 of 11 lower surface of piezoelectric sensing layer
For pulse signal to be transferred to piezoelectric sensing layer, and realization pulse signal transmission path and piezoelectricity biography from human skin surface
Feel the impedance matching of layer.It should be noted that the present embodiment does not limit the material of protective layer, as long as having good power
Property is learned, there is good ductility, it can Transmit evenly pressure.
Further, which further includes insulating thin layer 16, and insulating thin layer 16 is set to piezoelectric sensing
Layer 11 is towards between the one side at pulse detection and protective layer 15.The insulating thin layer 16 is also flexible material, but without electricity
Gas characteristic is only used to protect flexible piezoelectric electret film 110, prevents human sweat and other impurities and flexible piezoelectric electret
Film 110 directly contacts and damages the flexible piezoelectric electret film 110, and be conducive to enhancing piezoelectric sensing layer 11 uses the longevity
Life.Since flexible piezoelectric electret film 110 does not contact directly with human skin, the tail interference that human body fine motion is made can also
Significantly reduce.
The pulse detecting device of the present embodiment can be made into wearable device, as shown in Figure 4.Shape such as wrist-watch, dial plate position
Setting is pulse detecting device 1, and watchband 2 has multiple bundle holes, and various sizes of user is facilitated to wear；Pulse detecting device 1 passes through
Communication carries out data transmission with data receiving terminal 3.
When pulse detecting device described in the present embodiment works, it can be placed at wrist radial artery, for detecting fighting for heart
Dynamic (vibration) along arteries and blood flow to periphery spread the pulse wave signal that is formed, specifically: by the pulse detecting device
It is fixed at wrist radial artery, when pulse is beaten, makes to generate vibration with the protective layer of skin contact, and then make to be wrapped in protective layer
In piezoelectric sensing layer generate vibration, piezoelectric sensing layer vibrate when, the porous structure of flexible piezoelectric electret film is compressed, interior
Portion's electric dipole moment density changes, and causes the compensation charge thereon, in lower surface metal electrode to change, data processor
Structure connects two metal electrodes, and obtains the quantity of electric charge that flexible piezoelectric electret film is generated in deformation by two metal electrodes and become
Change amount, and potential change amount is determined according to the quantity of electric charge variable quantity, and the potential change amount is sent to data receiver end
End, data receiving terminal determine pulsatile motion signal according to the potential change amount.
It should be noted that the pulse detecting device of the present embodiment can be placed in: 1), radial artery, the root of hand thumb
The oar side (there is bone tubercle protuberance, just by the palmar aspect of protuberance) of facies palmaris arteriopalmus can be touched, be exactly that oar is dynamic
Arteries and veins；2), on arteria brachialis, elbow the bicipital muscle of arm inside, and measurement blood pressure when stethoscope place position；3), arteria carotis is deposited
It is the artery of vertebrate neck；4), arteria dorsalis pedis；5), femoral artery.
Above-mentioned difference pulses measure point pressure energy as caused by beat pulse is of different sizes, corresponding pulse detecting device
Also different from the fitting tightness degree of different measurement points, the signal-to-noise ratio of signal collected is also just different, therefore practical progress arteries and veins
It fights when detecting, the adhesive force between pulses measure point and pulse detecting device and measurement point can be selected according to concrete application scene
Degree.It in general, is the pulse detection position of mainstream at human body wrist radial artery.
The pulse detecting device of the present embodiment, can also be related by the information acquisition pulse in addition to it can provide initial data
Physical quantity and information content in relation to Human Physiology health, this is more advantageous to research and clinical analysis application.These information content packets
, the elasticity of artery it includes: 1)；2), the size of lumen；3), the density and viscosity of blood；4), pulse wave conduction speed (PWV), tool
Body refers to that heart is beaten every time and penetrates the pressure wave conduction of velocity of blood generation propagated along main artery wall, is assessment arteries stiffness index
Simple and direct, effective, economic Noninvasive index, can damage of the various risk factors of concentrated expression to blood vessel, be cardiovascular
The independentpredictor of event；5), chronic psychiatric pressure；6), blood vessel aging；7), heart stabilizer degree weakens；8), pulse wave pressure
Power index；9), pulse wave viscous index；10), index of variability is perfused in pulse pulsating index and pulse.
The research of pulse wave information is widely used in every field, such as biomethanics, medicinal, rehabilitation project, engineering
The numerous areas such as analysis, athletic training, wearable device have important scientific meaning and application value.Therefore compared to
The pulse detecting device of the prior art, pulse detecting device described in the present embodiment, which has, is more widely applied scene.
The technical solution of pulse detecting device provided in this embodiment, including piezoelectric sensing layer and DPA data processing activity, pressure
Electric sensing layer includes flexible piezoelectric electret film, and is respectively arranged on two gold medals of flexible piezoelectric electret film upper and lower surfaces
Belong to electrode, two metal electrodes are used for the output charge amount variable quantity when deformation occurs for flexible piezoelectric electret film；Data processing
Mechanism is used to connect two metal electrodes to receive the quantity of electric charge variable quantity of two metal electrodes output, and according to quantity of electric charge variable quantity
It determines potential change amount, and potential change amount is sent to data receiving terminal.By in flexible piezoelectric electret film two
Side setting metal electrode make piezoelectric sensing layer have flexibility, thus make pulse detecting device have flexibility, can preferably with arteries and veins
It fights and is bonded at detection, while greatly reducing the structure complexity of detection device compared with the existing technology, be conducive to improve pulse
The accuracy of signal detection.
Embodiment two
Fig. 5 is the flow chart of the production method for the pulse detecting device that the utility model embodiment two provides.This is practical new
Type embodiment is adapted to the production of flexible pulse detecting device.As shown in figure 5, the production method includes:
S101, the flexible piezoelectric electret film for obtaining preset shape, and in the upper and lower table of flexible piezoelectric electret film
A metal electrode is respectively set in face, to export the electricity that flexible piezoelectric electret film is generated when deformation occurs by metal electrode
Lotus amount variable quantity.
A piece of flexible piezoelectric electret film is cut into preset shape, such as round, then as shown in Figure 1, on it,
Type metal electrode 111 obtains piezoelectric sensing layer 11, i.e. piezoelectric transducer respectively for lower surface.It can be measured by two metal electrodes
The quantity of electric charge variable quantity that flexible piezoelectric electret film is generated when deformation occurs, realizes force signal being converted to electric signal.
Under pressure, the porous structure of flexible piezoelectric electret film is compressed, and internal electric dipole moment density occurs
Variation, causes the compensation charge thereon, in lower surface metal electrode to change, force signal is converted into electric signal；In no gold
The white space for belonging to electrode, then can not acquire compensation charge, therefore do not have power-electricity transfer capability, not constitute piezoelectric sensing
Device.
For the ease of the use of pulse detecting device, the present embodiment designs one and flexible piezoelectric electret by 3D printing
The adaptable flexible accommodating chamber of body thin film shape, as shown in Fig. 2, flexible accommodating chamber 13 is open at one end, for accommodating piezoelectric sensing
Layer 11.Flexible accommodating chamber 13 includes concavity curved-surface structure, and overall structure is similar to cake, facilitates the pulse energy to measurement
Collected to facilitate detection, can also play certain shielding action, prevents extraneous noise to pulse signal collected
Interference, and then enhance the signal-to-noise ratio of signal.Illustratively, flexible accommodating chamber is integrally similar to " auscultation head ", or flexible receiving
The longitudinal section of chamber is parabola shaped.
In order to reduce the interference of outer bound pair pulse detecting device, and the accuracy of testing result is improved, the present embodiment exists
Shielded layer 14 (such as Fig. 2) is arranged in the outer surface of flexible accommodating chamber 13, and by the button cell of shielded layer 14 and DPA data processing activity
Cathode be connected so that the current potential of shielded layer 14 is identical as the cathode potential of button cell.Specifically, flexible accommodating chamber 13 is outer
Surface is wrapped in one layer of uniform electrode, covers entire flexible accommodating chamber outer surface and edge, and piezoelectric sensing layer
The metal electrode and DPA data processing activity of 11 upper and lower surfaces are formed into a loop.It is formed in this way in the outside of entire piezoelectric sensing layer
Metal enclosure so as to form electromagnetic shielding reduces electromagnetic interference.Wherein, the preferred copper foil of the present embodiment is as shielding
Layer.
In order to improve the service life and its flexibility of pulse detecting device, the present embodiment is also in the upper and lower of piezoelectric sensing layer
It is coated with protective layer 15, as shown in Figures 2 and 3, makes protective layer 15 full of entire flexible accommodating chamber 13, so that piezoelectric sensing
Layer 11 is fixed in flexible accommodating chamber 13 by protective layer 15, is helped to protect piezoelectric sensing layer 11, is prevented piezoelectric sensing layer 11
Abrasion.Furthermore it is also possible to by the protective layer that is set to piezoelectric sensing layer lower surface by pulse signal from human skin surface
It is transferred to piezoelectric sensing layer, and realizes the impedance matching of pulse signal transmission path and piezoelectric sensing layer.It should be noted that
The present embodiment does not limit the material of protective layer, as long as having good mechanical property, has good ductility, can be
Pressure is transmitted evenly.
Further, as shown in figure 3, in piezoelectric sensing layer 11 towards between the one side at pulse detection and protective layer 15
Then composite layer is encapsulated in flexible accommodating chamber 13 by setting insulating thin layer 16 with obtaining composite layer.The insulating thin layer 16
It is also flexible material, but does not have electrical characteristic, is only used to protect flexible piezoelectric electret film, prevents human sweat and other are miscellaneous
Matter directly contacts with flexible piezoelectric electret film and damages the flexible piezoelectric electret film, is conducive to enhance piezoelectric sensing layer
Service life.Since flexible piezoelectric electret film does not contact directly with human skin, the tail that human body fine motion is made is interfered
It can also significantly reduce.
S102, metal electrode is connected with DPA data processing activity, so that DPA data processing activity is obtained by metal electrode
The quantity of electric charge variable quantity that flexible piezoelectric electret film is generated when deformation occurs, and potential is determined according to quantity of electric charge variable quantity
Variable quantity, and potential change amount is sent to data receiving terminal.
As shown in Figure 1, keeping the flexible circuit board of DPA data processing activity thin by the connection flexible piezoelectric electret of two pins 112
The metal electrode 111 of the upper and lower surfaces of film, so as to receive the charge generated when flexible piezoelectric 110 deformation of electret film
Variable quantity is measured, and potential change amount is determined according to quantity of electric charge variable quantity, and potential change amount is sent to data receiver end
End, is handled to obtain pulse signal the potential change amount by data receiving terminal.Specifically, DPA data processing activity can be with
Potential change amount is sent to data receiving terminal by wired or wireless communication mode, the present embodiment preferably passes through wireless near-field
Potential change amount is sent to data receiving terminal by communication means.Moreover, data receiving terminal can be dedicated data receiver
Terminal is also possible to the smart machines such as mobile phone.
Wherein, the flexible circuit of DPA data processing activity is powered by button cell, and DPA data processing activity and button cell
It is preferably encapsulated between flexible accommodating chamber and shielded layer.
The technical solution of the production method of pulse detecting device provided in this embodiment obtains the flexible piezoelectric of preset shape
Electret film, and a metal electrode is respectively set in the upper and lower surfaces of flexible piezoelectric electret film, to pass through metal electrode
The quantity of electric charge variable quantity that output flexible piezoelectric electret film is generated when deformation occurs；By metal electrode and DPA data processing activity
It is connected, so that DPA data processing activity obtains the electricity that flexible piezoelectric electret film is generated when deformation occurs by metal electrode
Lotus amount variable quantity, and potential change amount is determined according to quantity of electric charge variable quantity, and potential change amount is sent to data receiver
Terminal.Make piezoelectric sensing layer that there is flexibility by the way that metal electrode is arranged in flexible piezoelectric electret film two sides, to make pulse
Detection device has flexibility, can preferably be bonded at pulse detection, while greatly reducing detection compared with the existing technology
The structure complexity of device is conducive to the accuracy for improving pulse signal detection.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (7)
1. a kind of pulse detecting device characterized by comprising
Piezoelectric sensing layer, the piezoelectric sensing layer includes flexible piezoelectric electret film, and is respectively arranged on the flexible piezoelectric
Two metal electrodes of electret film upper and lower surfaces, two metal electrode are used to send out in the flexible piezoelectric electret film
Output charge amount variable quantity when raw deformation；
DPA data processing activity, the DPA data processing activity are defeated to receive two metal electrode for connecting two metal electrode
Quantity of electric charge variable quantity out, and potential change amount is determined according to the quantity of electric charge variable quantity, and by the potential change amount
It is sent to data receiving terminal.
2. pulse detecting device according to claim 1, which is characterized in that the flexible piezoelectric electret film is single layer
Perforated membrane, or be formed by stacking by multilayer porous film by mode in parallel or series.
3. pulse detecting device according to claim 1, which is characterized in that the DPA data processing activity includes flexible circuit
Plate, and the button cell being connect with the flexible circuit board.
4. pulse detecting device according to claim 3, which is characterized in that further include:
The flexible accommodating chamber being adapted with the piezoelectric sensing layer shape, the flexibility accommodating chamber is open at one end, for accommodating
State piezoelectric sensing layer；
Shielded layer, the shielded layer are the metal layer for being set to the flexible accommodating chamber outer surface, and be set to the shielding
The cathode of the button cell between layer and the flexible accommodating chamber is connected.
5. pulse detecting device according to claim 4, which is characterized in that the flexibility accommodating chamber includes concavity curved surface knot
Structure, to be converged to pulse signal collected, to realize the amplification of the pulse signal.
6. pulse detecting device according to claim 4, which is characterized in that further include:
Two protective layers are the flexible filler of the piezoelectric sensing layer upper and lower surfaces in the flexible accommodating chamber, and
It is set to the protective layer of piezoelectric sensing layer lower surface, for pulse signal to be transferred to the piezoelectricity from human skin surface
Sensing layer, and realize the impedance matching of pulse signal transmission path and the piezoelectric sensing layer.
7. pulse detecting device according to claim 6, which is characterized in that further include:
Insulating thin layer, the insulating thin layer be set to the piezoelectric sensing layer towards at pulse detection one side with it is described
Between protective layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110742592A (en) * | 2019-10-08 | 2020-02-04 | 郑州轻工业学院 | Human health detection method based on flexible piezoelectric electret pulse sensor |
| CN114431839A (en) * | 2022-04-08 | 2022-05-06 | 北京大学深圳研究生院 | Piezoelectric pulse sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110742592A (en) * | 2019-10-08 | 2020-02-04 | 郑州轻工业学院 | Human health detection method based on flexible piezoelectric electret pulse sensor |
| CN114431839A (en) * | 2022-04-08 | 2022-05-06 | 北京大学深圳研究生院 | Piezoelectric pulse sensor |
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