CN111248878A - Flexible pressure sensor and pulse condition measuring device - Google Patents
Flexible pressure sensor and pulse condition measuring device Download PDFInfo
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- CN111248878A CN111248878A CN201811453026.6A CN201811453026A CN111248878A CN 111248878 A CN111248878 A CN 111248878A CN 201811453026 A CN201811453026 A CN 201811453026A CN 111248878 A CN111248878 A CN 111248878A
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- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
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- 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
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- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/4854—Diagnosis based on concepts of traditional oriental medicine
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medical Informatics (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Veterinary Medicine (AREA)
- Biomedical Technology (AREA)
- Public Health (AREA)
- Cardiology (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Physiology (AREA)
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- Alternative & Traditional Medicine (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a flexible pressure sensor, comprising: a flexible substrate; a plurality of first flexible electrodes disposed on the flexible substrate; the flexible dielectric layer is arranged on the plurality of first flexible electrodes, and the dielectric constant of the flexible dielectric layer is changed under the action of different pressures; and the second flexible electrode is arranged on the flexible dielectric layer. The invention also provides a pulse condition measuring device. The invention solves the problem of lower sensitivity of the existing pressure sensor.
Description
Technical Field
The invention relates to the technical field of pressure sensors, in particular to a flexible pressure sensor and a pulse condition measuring device.
Background
The pulse condition of human body can transmit the physiological and pathological information of cardiovascular system, and is a window for observing the function change in human body, and can provide important basis for diagnosing diseases. Because the pulse is delicate, the body is difficult to distinguish, the heart is easy to feel, and the finger is difficult to understand, the obvious change under the hand needs experience and personal comprehension, so that the learning and inheritance are difficult. The modern computer aided analysis can partially overcome the defects, thereby improving the application of the pulse diagnosis in the traditional Chinese medicine. Due to the limitation of the development of sensor technology, the pulse waveform analysis mainly obtained by a single-part or single-point pulse sensor is taken as the main point at present. However, the repeatability of the single-point pulse sensor is poor, a very large signal error is caused by a tiny difference of the acquisition positions, the information quantity is not rich enough, the traditional Chinese medicine pulse feeling process is difficult to simulate, and the phenomena of pulse non-correspondence and pulse non-correspondence are caused.
The pulse feeling process of traditional Chinese medicine is that the traditional Chinese medicine uses three fingers to lift, press and find the pulse in cun, guan and chi parts, and then the doctor diagnoses the disease by means of experience and finger feeling. The structure of the finger is like a plurality of flexible and tiny touch sensor units which can sense multi-dimensional force, the information obtained by the plurality of sensing units forms sense through a certain biological process, and finally the final conclusion is given by the experience.
In the aspects of objectivity and quantification of traditional Chinese medicine, a great deal of work is done by predecessors, and various pulse condition instruments are invented. However, most of these pulse instruments are mainly unit type pressure sensors, are rigid and clumsy, are easy to cause discomfort of a subject, have small information amount, can only obtain one-dimensional pulse condition information, and cannot comprehensively and accurately reflect the pulse condition information characteristics of traditional Chinese medicine.
At present, flexible pressure sensors are mainly classified into four types: piezoresistive, piezoelectric, transistor, and capacitive. The resistance type is low in precision, long in relaxation time, easy to be influenced by temperature and large in drift; the piezoelectric type is only used for dynamic monitoring, and a special type amplification device is needed, so that the piezoelectric type is not easy to integrate; the transistor-type structure is complex; the capacitance type is mainly prepared by a semiconductor process, has high cost and low sensitivity, and is easy to be interfered.
In order to solve the problem of acquiring the pulse condition of the traditional Chinese medicine, the developed pulse condition sensor is required to be in a flexible contact type and accord with the following characteristics: the pulse detector is in a dot matrix type, high in precision and sensitivity, large in detection range, static pressure and dynamic pressure, and can accurately detect pulse beating under external pressures of floating, medium and sinking. However, today's flexible pressure sensors with high sensitivity only operate in a very limited low pressure range, whereas the sensitivity is very low for a large detection range.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the following technical scheme:
a flexible pressure sensor comprising:
a flexible substrate;
a plurality of first flexible electrodes disposed on the flexible substrate;
the flexible dielectric layer is arranged on the plurality of first flexible electrodes, and the dielectric constant of the flexible dielectric layer is changed under the action of different pressures;
a second flexible electrode disposed on the flexible dielectric layer.
Preferably, the flexible pressure sensor further comprises:
and the analog-to-digital conversion devices are arranged on the flexible substrate, and each first flexible electrode is independently and electrically connected with the analog-to-digital conversion device.
Preferably, the flexible dielectric layer comprises a composite of at least one of graphene, carbon nanotubes, silver nanowires, copper nanowires, nano barium carbonate particles and nano titanium dioxide with a high molecular polymer elastomer.
Preferably, the high molecular polymer elastomer includes one of styrene block copolymer, thermoplastic polyurethane, polyolefin elastomer, polystyrene elastomer, polyamide elastomer, and silicone rubber.
Preferably, the first flexible electrode and/or the second flexible electrode are woven from conductive fibres.
Preferably, the thickness of the flexible dielectric layer is 50 μm to 200 μm.
Preferably, the area of the first flexible electrode is 1mm2～4mm2And/or the distance between two adjacent first flexible electrodes is 0.1 mm-0.2 mm.
Preferably, the occupied area of the plurality of first flexible electrodes is 0.6cm2～1cm2。
Preferably, the first flexible electrode is square.
The invention also provides a pulse condition measuring device which comprises the flexible pressure sensor and a processor, wherein the processor is used for receiving the digital signals sent by the analog-to-digital conversion device.
Compared with the prior art, the dielectric constant of the dielectric layer of the flexible pressure sensor is greatly changed under the change of different external pressures, so that the capacitance value of the flexible pressure sensor is increased along with the pressure change rate. Therefore, the sensitivity and the pressure detection range of the flexible pressure sensor are improved.
Drawings
FIG. 1 is a schematic structural view of a flexible pressure sensor of the present invention;
fig. 2 is a cross-sectional view of a flexible pressure sensor of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Example 1
As shown in fig. 1 and fig. 2, the flexible pressure sensor provided in the present embodiment includes a flexible substrate 1, a plurality of first flexible electrodes 2, a flexible dielectric layer 3, a second flexible electrode 4, and an analog-to-digital conversion device 5. The plurality of first flexible electrodes 2 are disposed on the flexible substrate 1, the flexible dielectric layer 3 is disposed on the plurality of first flexible electrodes 2, and the second flexible electrode 4 is disposed on the flexible dielectric layer 3. The analog-to-digital conversion device 5 is also disposed on the flexible substrate and electrically connected to each of the first flexible electrode 2 and the second flexible electrode 4.
The flexible dielectric layer 3 is a composite of at least one of graphene, carbon nanotubes, silver nanowires, copper nanowires, nano barium carbonate particles and nano titanium dioxide and a high polymer elastomer (for example, one of styrene block copolymer, thermoplastic polyurethane, polyolefin elastomer, polystyrene elastomer, polyamide elastomer and silicone rubber), and has a thickness of 50-200 μm. The dielectric constant of the flexible dielectric layer 3 can be greatly changed under the action of different pressures. Therefore, the sensitivity of the flexible pressure sensor is increased, and the detection range of the pressure sensor is improved.
As a further improvement, the first flexible electrode 2 and/or the second flexible electrode 4 are square and are woven by conductive fibers. Wherein the area of the first flexible electrode 2 is 1mm2～4mm2. The distance between two adjacent first flexible electrodes 2 is 0.1 mm-0.2 mm. The occupied area of the first flexible electrodes 2 is 0.6cm2～1cm2。
Example 2
Based on embodiment 1, in this embodiment, the flexible pressure sensor may include a plurality of first flexible electrodes 2 arranged in a matrix. The number range of the horizontal rows of the first flexible electrodes 2 is 4-5, and the number range of the vertical rows of the first flexible electrodes 2 is 5-6. The flexible pressure sensor of this embodiment has sufficient sensing elements to facilitate coverage of the radial artery.
Example 3
Based on the embodiment 1, in the present embodiment, the flexible dielectric layer 3 is preferably a composite of graphene and silicone rubber, and the volume fraction of graphene in the composite is 1%. The dielectric constant of the flexible dielectric layer 3 can be greatly changed under the action of different pressures, so that the sensitivity of the flexible pressure sensor is increased.
Example 4
Based on the embodiment 1, in the present embodiment, the flexible dielectric layer 3 is preferably a composite of copper nanowires and a polyamide-based elastomer, and the volume fraction of the copper nanowires in the composite is 2.5%. The young's modulus of the flexible dielectric layer 3 is relatively high, so that the detectable pressure range is relatively large, and the detection range of the flexible pressure sensor is further improved.
Example 5
Based on the embodiment 1, in the present embodiment, the flexible dielectric layer 3 is preferably a composite of silver nanowires and a polyamide elastomer, and the volume fraction of the silver nanowires in the composite is 2%. The young's modulus of the flexible dielectric layer 3 is relatively high, so that the detectable pressure range is relatively large, and the bending performance of the flexible pressure sensor is improved.
Example 6
Based on the embodiment 1, in this embodiment, the flexible dielectric layer 3 is preferably a composite of carbon nanotubes and thermoplastic polyurethane, the volume fraction of the carbon nanotubes in the composite is 1.5%, and a small amount of doping not only greatly increases the dielectric constant of the composite material, but also retains the flexibility of the original polymer.
In another aspect of the invention, a pulse condition measuring device is provided. The device includes the flexible pressure sensor of any of the embodiments described above and a processor. The processor is used for receiving the digital signals sent by the analog-to-digital conversion device 5 and converting the digital signals into a three-dimensional dynamic graph, and can display more accurate, vivid and visual pulse condition characteristics.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A flexible pressure sensor, comprising:
a flexible substrate (1);
a plurality of first flexible electrodes (2) disposed on the flexible substrate (1);
a flexible dielectric layer (3) disposed on the plurality of first flexible electrodes (2), a dielectric constant of the flexible dielectric layer (3) changing under the action of different pressures;
a second flexible electrode (4) disposed on the flexible dielectric layer (3).
2. The flexible pressure sensor of claim 1, further comprising:
and the analog-to-digital conversion devices (5) are arranged on the flexible substrate, and each first flexible electrode (2) is independently and electrically connected with the analog-to-digital conversion device (5).
3. The flexible pressure sensor according to claim 1 or 2, wherein the flexible dielectric layer (3) comprises a composite of at least one of graphene, carbon nanotubes, silver nanowires, copper nanowires, nano barium carbonate particles, nano titanium dioxide and a high molecular polymer elastomer.
4. The flexible pressure sensor of claim 3, wherein the high molecular polymer elastomer comprises one of a styrene block copolymer, a thermoplastic polyurethane, a polyolefin-based elastomer, a polystyrene-based elastomer, a polyamide-based elastomer, and a silicone rubber.
5. The flexible pressure sensor according to claim 1, characterized in that the first flexible electrode (2) and/or the second flexible electrode (4) are woven from electrically conductive fibers.
6. The flexible pressure sensor according to claim 1, characterized in that the thickness of the flexible dielectric layer (3) is 50-200 μm.
7. The flexible pressure sensor according to claim 1, characterized in that the area of the first flexible electrode (2) is 1mm2～4mm2And/or the distance between two adjacent first flexible electrodes (2) is 0.1 mm-0.2 mm.
8. The flexible pressure sensor according to claim 1, wherein the plurality of first flexible electrodes (2) occupy an area of 0.6cm2～1cm2。
9. The flexible pressure sensor according to claim 1 or 7 or 8, characterized in that the first flexible electrode (2) is square.
10. Pulse condition measuring device, comprising a flexible pressure sensor according to any of claims 2-9 and a processor for receiving digital signals sent by said analog-to-digital conversion means (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811453026.6A CN111248878A (en) | 2018-11-30 | 2018-11-30 | Flexible pressure sensor and pulse condition measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811453026.6A CN111248878A (en) | 2018-11-30 | 2018-11-30 | Flexible pressure sensor and pulse condition measuring device |
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| CN111248878A true CN111248878A (en) | 2020-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051922A (en) * | 2020-08-11 | 2020-12-08 | 深圳市华星光电半导体显示技术有限公司 | Tactile feedback device, preparation method thereof and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102525439A (en) * | 2012-02-16 | 2012-07-04 | 无锡爱普瑞康科技有限公司 | Flexible multi-point sphygmus sensor device |
| CN106017748A (en) * | 2016-05-19 | 2016-10-12 | 北京印刷学院 | Capacitive flexible pressure sensor based on composite material dielectric layer and preparation method of capacitive flexible pressure sensor |
| KR20180069990A (en) * | 2016-12-15 | 2018-06-26 | 연세대학교 산학협력단 | High sensitive flexible pressure sensor and method thereof |
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2018
- 2018-11-30 CN CN201811453026.6A patent/CN111248878A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102525439A (en) * | 2012-02-16 | 2012-07-04 | 无锡爱普瑞康科技有限公司 | Flexible multi-point sphygmus sensor device |
| CN106017748A (en) * | 2016-05-19 | 2016-10-12 | 北京印刷学院 | Capacitive flexible pressure sensor based on composite material dielectric layer and preparation method of capacitive flexible pressure sensor |
| KR20180069990A (en) * | 2016-12-15 | 2018-06-26 | 연세대학교 산학협력단 | High sensitive flexible pressure sensor and method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051922A (en) * | 2020-08-11 | 2020-12-08 | 深圳市华星光电半导体显示技术有限公司 | Tactile feedback device, preparation method thereof and electronic equipment |
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Application publication date: 20200609 |