CN210204707U - Flexible pressure sensor and pulse diagnosis instrument - Google Patents
Flexible pressure sensor and pulse diagnosis instrument Download PDFInfo
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- CN210204707U CN210204707U CN201920464936.8U CN201920464936U CN210204707U CN 210204707 U CN210204707 U CN 210204707U CN 201920464936 U CN201920464936 U CN 201920464936U CN 210204707 U CN210204707 U CN 210204707U
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Abstract
The utility model relates to a sensor technical field discloses a flexible pressure sensor and pulse-taking instrument. The flexible pressure sensor comprises a first electret layer, a second electret layer, an intermediate layer, a first electrode layer and a second electrode layer, wherein the intermediate layer is fixed between the first electret layer and the second electret layer, the first electrode layer is fixed on the first electret layer, the second electrode layer is fixed on the second electret layer, and a plurality of through holes are formed in the intermediate layer. The pulse diagnosis instrument comprises the flexible pressure sensor and a wrist strap, wherein the wrist strap is arranged outside the flexible pressure sensor to fix the flexible pressure sensor at a position to be measured. The flexible pressure sensor is small in thickness, good in flexibility, high in sensitivity and accurate in measurement result; the pulse diagnosis instrument can accurately capture pulse wave signals of a human body, is easy to completely adhere to the skin, and is not easy to cause discomfort after being worn for a long time.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a flexible pressure sensor and pulse-taking instrument.
Background
The sensor is a detection device which can sense the measured information and convert the sensed information into an electric signal or other required forms of information to be output according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. Pressure sensor is comparatively common one in the sensor, and its wide application is in a plurality of fields, and pressure sensor mainly utilizes piezoelectric effect to work, can feel external pressure signal to according to certain law with pressure signal conversion to the signal of telecommunication of output. Nowadays, wearable measuring equipment for human health detection gradually enters our lives so as to accurately monitor our health conditions and bring great convenience to people. These devices usually capture various physiological signals of human body by using sensors, and convert the signals into various visual index parameters such as heart rate, blood pressure and the like after processing, so that people can know their own physical states.
However, most of the sensors used in the existing detection equipment belong to hard sensors, and the sensors have insufficient flexibility and large thickness. Therefore, the device can not be completely attached to the position to be measured of the human body when being worn, so that the device can not reach high sensitivity, and can not accurately capture some weak physiological signals, thereby greatly limiting the accuracy of the measurement result, influencing the comfort when being worn and being not suitable for long-time use.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a flexible pressure sensor and a pulse diagnosis instrument, wherein the flexible pressure sensor has small thickness, good flexibility, high sensitivity and accurate measurement result; the pulse diagnosis instrument can accurately capture pulse wave signals of a human body, is easy to completely adhere to the skin, and is not easy to cause discomfort after being worn for a long time.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a flexible pressure sensor, including first electret layer, second electret layer, intermediate level, first electrode layer and second electrode layer, the intermediate level is fixed in first electret layer with between the second electret layer, first electrode layer is fixed in on the first electret layer, the second electrode layer is fixed in on the second electret layer, be equipped with a plurality of through-holes on the intermediate level.
As an improvement of the technical scheme, the porosity on the middle layer ranges from 10% to 70%.
As a further improvement of the above technical solution, the diameter range of the through holes is 1 mm to 5mm, and the center-to-center distance between adjacent through holes ranges from 1.2 mm to 30 mm.
As a further improvement of the above technical solution, the thickness range of the intermediate layer is 100-500 μm, and the thickness ranges of the first electret layer and the second electret layer are 10-50 μm.
As a further improvement of the above technical solution, the thickness of the first electrode layer is 50nm, and the thickness of the second electrode layer is 10 μm.
The pulse diagnosis instrument comprises the flexible pressure sensor and a wrist strap, wherein the wrist strap is arranged outside the flexible pressure sensor to fix the flexible pressure sensor at a position to be measured.
As a further improvement of the above technical solution, the wrist strap fixing device further comprises a fixed point pressurizing device, wherein the fixed point pressurizing device comprises a rigid positioning element, an accommodating space is formed in the positioning element, a hole site communicated with the accommodating space is formed in the positioning element, the flexible pressure sensor is arranged in the hole site, the wrist strap is fixed outside the fixed point pressurizing device, and the wrist strap can apply acting force towards the accommodating space to the flexible pressure sensor.
As a further improvement of the technical scheme, the flexible pressure sensor comprises a plurality of flexible pressure sensors distributed in an array mode.
The utility model has the advantages that: the flexible pressure sensor in the utility model has small thickness, good flexibility, high sensitivity and accurate measuring result; the pulse diagnosis instrument can accurately capture pulse wave signals of a human body, is easy to completely adhere to the skin, and is not easy to cause discomfort after being worn for a long time.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of a flexible pressure sensor according to an embodiment of the present invention;
fig. 2 is a top view of a flexible pressure sensor in an embodiment of the invention;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
fig. 4 is a schematic structural diagram of an intermediate layer of a flexible pressure sensor according to an embodiment of the present invention;
fig. 5 is a signal feedback block diagram of the pulse diagnosis instrument according to an embodiment of the present invention;
FIG. 6 illustrates a first configuration of a site specific compression device in accordance with an embodiment of the present invention;
FIG. 7 illustrates a second configuration of a site specific compression device in accordance with an embodiment of the present invention;
fig. 8 is a third configuration of a fixed point pressurizing device according to an embodiment of the present invention.
Detailed Description
The conception, specific structure and technical effects of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, so as to fully understand the objects, aspects and effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, front, rear, etc. used in the present invention is only relative to the mutual position relationship of the components of the present invention in the drawings.
Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
Referring to fig. 1 to 3, a schematic structural diagram, a top view and a cross-sectional view of a flexible pressure sensor according to an embodiment of the present invention are shown. The flexible pressure sensor comprises an intermediate layer 1, a first electret layer 2, a second electret layer 3, a first electrode layer 4 and a second electrode layer 5. The intermediate layer 1 is fixed between the first electret layer 2 and the second electret layer 3. The first electrode layer 4 is fixed to the outer surface of the first electret layer 2, and the second electrode layer 5 is fixed to the outer surface of the second electret layer 3. And lead wires are respectively led out of the first electrode layer 4 and the second electrode layer 5 to be connected with an external circuit.
The thickness of the intermediate layer 1 is in the range of 100-500. mu.m, preferably 150. mu.m. The thickness of the first electret layer 2 and the second electret layer 3 is in the range of 10 to 50 μm. The thickness of the first electrode layer 4 was 50nm and the thickness of the second electrode layer 5 was 10 μm. It follows that the thickness of the entire sensor is extremely small.
Referring to fig. 4, a schematic structural diagram of an intermediate layer of a flexible pressure sensor according to an embodiment of the present invention is shown. A plurality of through holes 11 are uniformly distributed on the middle layer 1. The porosity of the intermediate layer 1 is 10-70%. The diameter range of the through holes 11 is 1-5mm, and the center distance range of the adjacent through holes 11 is 1.2-30 mm. Preferably, the diameter of the through holes 11 is 2mm, and the center-to-center distance between adjacent through holes is 3 mm. The shape of the through hole 11 is preferably circular, but may be a regular polygon or other irregular shape. For regular polygonal holes or other irregularly shaped holes, the diameter of the hole is based on the diameter of the inscribed circle.
The material of the intermediate layer 1 may be selected from, but not limited to, ultra-soft addition-curing silicone such as Ecoflex, silicone rubber such as Polydimethylsiloxane (PDMS), thermoplastic elastomer such as styrene block copolymer (SEBS), and silicone rubber such as platinum-curing liquid silicone compound (DragonSkin). The middle layer 1 is made of the material with good flexibility, and the flexibility is further enhanced by the through holes 11. The manufactured sensor has good flexibility, can be designed and processed into different shapes according to different application occasions, can be deformed greatly during measurement, and can be better attached to the skin of a position to be measured so as to improve the sensitivity and ensure the accuracy of a measurement result.
When the flexible pressure sensor is manufactured, the middle layer 1 is punched, and is chemically bonded with the first electret layer 2 and the second electret layer 3 after surface modification. A thin Au layer was coated on the outer surface of the first electret layer 2 by a magnetron sputtering method to form the first electrode layer 4. An Al tape is adhered to the outer surface of the second electret layer 3 to form the second electrode layer 5 and to serve as a mechanical support for the top layers thereof.
The atmospheric electric dipole is formed by a high voltage corona charging method using a high voltage power supply (dc high voltage), a corona pin and a ground electrode. After bonding is completed, a large amount of air remains in the through-hole 11 in the intermediate layer 1. And placing the semi-finished product on the top of the grounding electrode and 3cm below the corona needle point. A high voltage of 15-30kV is applied to the corona needle to ionize the air inside the through-hole 11.
The ionized free charges are captured by the inner surfaces of the first electret 2 and the second electret 3 because the electrets have good electrostatic charge storage capacity and can stably store charges for a long time. The first electret 2 and the second electret 3 are similar to a capacitor which takes air in a through hole as a medium. Because C is Q/U is epsilon S/d. When pressure is applied to the sensor, the intermediate layer 1 is compressed to reduce the through hole 11 therein, which corresponds to a reduction in the distance d between the two plates, thereby reducing the capacitance C. Since the quantity Q of electricity charged on the first electret 2 and the second electret 3 is not changed, the voltage U in the external circuit is changed, so as to realize the conversion between the mechanical deformation and the electrical signal.
The flexible pressure sensor can be applied to a pulse diagnosis instrument. Referring to fig. 5, a signal feedback block diagram of the pulse diagnosis instrument according to an embodiment of the present invention is shown. The pulse diagnosis instrument comprises the flexible pressure sensor, a wrist strap, an automatic pressurizing module, a processor, a signal processing module, a storage module and a display module. The signal processing module is electrically connected with the flexible pressure sensor and the processor. The automatic pressurizing module is electrically connected with the wrist strap and the processor. The storage module and the display module are electrically connected with the processor.
During measurement, the flexible pressure sensor is arranged at a position to be measured, and the wrist strap is sleeved outside the flexible pressure sensor to fix the position of the flexible pressure sensor. The automatic pressurizing module is controlled by a signal from the processor to apply automatic and continuous pressure to the wrist strap. During the compression, pulse wave signals at different pressures are measured by the flexible pressure sensor. The measured pulse wave signals are amplified and filtered by the signal processing module and then transmitted to the processor. The processor transmits the pulse wave signals to the storage module for storage and displays the pulse wave signals through the display module, or the processor can transmit the measured pulse wave signals to the mobile terminal through the wireless communication device. The automatic pressurizing module also comprises a static pressure sensor, so that the automatic pressurizing module can measure the pressure applied in the measuring process in real time and automatically adjust the pressure through feedback.
In addition, a plurality of flexible pressure sensors distributed in an array mode can be arranged in the pulse diagnosis instrument. The design of array distribution can reduce the deviation caused by the dislocation of 'inch, close and length' pulse points and the sensors, and improve the accuracy of measurement. The array mode can be designed according to the actual use requirement.
When the pulse diagnosis instrument is used for traditional Chinese medicine pulse diagnosis, three pulse points of cun, guan and chi on the radial artery are generally required to be diagnosed with three different forces of floating, middle and sinking, and the pulse condition change of a patient is sensed under the action of the different forces. Therefore, the fixed-point pressurizing device is provided, so that the pressurizing position is more accurate during measurement, and the measurement result is more real and accurate.
With the difference of exerting pressure on a large scale that goes on through whole piece wrist strap among the prior art, fixed point pressure device in this scheme can only carry out accurate fixed point to "cun, pass, chi" three pulse point department and pressurize.
Referring to fig. 6, a first configuration of a fixed point pressurizing device according to an embodiment of the present invention is shown. The pointing pressure device 61 includes a first positioning member 611 and a second positioning member 612, which are detachably connected. When the first positioning element 611 is connected to the second positioning element 612, an accommodating space is formed therein, and the accommodating space is used for accommodating the wrist of the user. The first positioning element 611 is provided with a first hole 6113, a second hole 6114 and a third hole 6115. The positions of the three hole sites correspond to the cun, guan and chi parts of the radial artery of the wrist of the user in sequence. And the hole sites are communicated with the accommodating space, and three flexible pressure sensors are arranged and can respectively pass through the three hole sites to be attached to the inch part, the close part and the ruler part.
The first positioning member 611 and the second positioning member 612 can be connected by a snap structure. The two ends of the first positioning element 611 are respectively provided with a first protrusion 6111 and a first groove 6112, and the two ends of the second positioning element 612 are respectively provided with a second groove 6121 and a second protrusion 6122. The first bump 6111 is matched with the second groove 6121, and the first groove 6112 is matched with the second bump 6122. When wearing, the first positioning element 611 and the second positioning element 612 are both sleeved on the region to be measured of the wrist, and the protrusions and the grooves at the corresponding positions are engaged, so that the fixed-point pressurizing device is fixed on the wrist.
Referring to fig. 7, a second configuration of a fixed point pressurizing device according to an embodiment of the present invention is shown. The difference from the first structure is only the connection mode between the first positioning piece and the second positioning piece. It comprises a first positioning member 621 and a second positioning member 622 detachably connected. A first magnetic member 6211 is fixed to the end of the first positioning member 621, and an outer end 62111 of the first magnetic member 6211 extends out of the end of the first magnetic member 6211. A second magnetic member 6221 is fixed to an end of the second positioning member 622, and a receiving portion 6222 is provided between an outer end surface of the second magnetic member 6221 and an outer end surface of the second positioning member 622. When the device is worn, the outer end 62111 of the first magnetic member 6211 is placed in the accommodating portion 6222, and the first magnetic member 6211 and the second magnetic member 6221 are attracted to each other, so that fixation is achieved.
Referring to fig. 8, a third structure of the fixed point pressurizing device according to an embodiment of the present invention is shown. The difference between the first and second structures is only the connection mode between the first positioning piece and the second positioning piece. In the present embodiment, the first positioning element and the second positioning element are integrated, so that the whole positioning element 63 is "C" shaped. The first end 631 and the second end 632 of the positioning member 63 can be opened and reset. First end 631 and second end 632 may be opened by applying an outward force, and reset may be achieved by removing the applied force. After the wrist support is opened, the wrist is put in the wrist support, and fixation is realized after the wrist support is reset.
In addition, still can make the first end of first locating piece and the first end of second locating piece articulated, the second end of first locating piece can rotate around the two junction, and the second end of first locating piece and the second end of second locating piece realize being connected through buckle structure. When the wrist pressure device is worn, the first positioning piece and the second positioning piece are sleeved in the area to be measured of the wrist, and the second end of the first positioning piece is clamped with the second end of the second positioning piece, so that the fixed point pressure device is fixed on the wrist.
Of course, besides the above-mentioned connection manners, other connection structures capable of realizing fixing may also be used, such as fixing manners of various bracelets, watches, and other articles. In the wearing process, the three hole sites on the fixed-point pressurizing device are fixed after corresponding to the inch, the close and the size of a user respectively.
The fixed-point pressurizing device can be customized for different users in a 3D printing mode. Therefore, the shape of the inner wall of the positioning piece is matched with the shape of the area to be measured on the wrist of the user, and the positions of the three hole sites correspond to the positions of the cun, guan and chi of the user, so that the device is completely attached to the wrist of the user in the measuring process, and the accuracy of pulse diagnosis is improved.
When the pulse-taking instrument is used, the positions of the cun, the guan and the chi of the radial artery of a person to be measured are firstly found, the fixed-point pressurizing device is sleeved on the area to be measured of the wrist of the user, the three hole positions on the fixed-point pressurizing device are respectively aligned with the positions of the cun, the guan and the chi and are fixed, then the three flexible pressure sensors are respectively placed in the three hole positions, and the wrist strap is fixed outside the fixed-point pressurizing device. The three flexible pressure sensors are pressed through the wrist strap, and in the pressing process, the three flexible pressure sensors are extruded by the wrist strap and are tightly attached to the wrist of a user in three hole positions on the positioning piece respectively to measure. The gap between the flexible pressure sensor and the hole site is preferably in the range of 0.3mm-1.0 mm.
The fixed-point pressurizing device is made of a material with certain rigidity, such as plastic, organic glass or resin. Therefore, in the process of pressing the wrist strap, pressure is only applied to the cun position, the guan position and the chi position through the three probes, and other parts cannot be pressed due to the support of the fixed point pressing device, so that interference and errors are reduced, and the accuracy of pulse diagnosis is improved. Of course, the rigidity is not absolutely not deformed when an external force is applied, and the force required to deform the wrist strap is far greater than the force applied through the wrist strap. In addition, in the third embodiment, the two materials can be spliced together, wherein the two end parts are made of a material with certain elasticity, and the middle part is made of a material which is not easy to deform.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a flexible pressure sensor, its characterized in that includes first electret layer, second electret layer, intermediate level, first electrode layer and second electrode layer, the intermediate level is fixed in first electret layer with between the second electret layer, first electrode layer is fixed in on the first electret layer, the second electrode layer is fixed in on the second electret layer, be equipped with a plurality of through-holes on the intermediate level.
2. The flexible pressure sensor of claim 1 wherein the void fraction on the intermediate layer is in the range of 10% to 70%.
3. The flexible pressure sensor of claim 2, wherein the vias have a diameter in the range of 1-5mm and a center-to-center spacing between adjacent vias in the range of 1.2-30 mm.
4. The flexible pressure sensor of claim 1, wherein the thickness of the intermediate layer is in the range of 100-500 μm, and the thickness of the first electret layer and the second electret layer is in the range of 10-50 μm.
5. The flexible pressure sensor of claim 1, wherein the thickness of the first electrode layer is 50nm and the thickness of the second electrode layer is 10 μ ι η.
6. A pulse diagnosis instrument, comprising the flexible pressure sensor according to any one of claims 1 to 5, and further comprising a wrist strap provided outside the flexible pressure sensor to fix the flexible pressure sensor to a site to be measured.
7. The pulse diagnosis instrument according to claim 6, further comprising a fixed point pressurizing device, wherein the fixed point pressurizing device comprises a rigid positioning member, an accommodating space is formed in the positioning member, a hole site communicated with the accommodating space is formed in the positioning member, the flexible pressure sensor is arranged in the hole site, the wrist strap is fixed to the outside of the fixed point pressurizing device, and the wrist strap can apply acting force towards the accommodating space to the flexible pressure sensor.
8. The pulse diagnosis instrument according to claim 6, comprising a plurality of said flexible pressure sensors distributed in an array.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920464936.8U CN210204707U (en) | 2019-04-08 | 2019-04-08 | Flexible pressure sensor and pulse diagnosis instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920464936.8U CN210204707U (en) | 2019-04-08 | 2019-04-08 | Flexible pressure sensor and pulse diagnosis instrument |
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| CN210204707U true CN210204707U (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013234A (en) * | 2019-04-08 | 2019-07-16 | 清华大学深圳研究生院 | A kind of pliable pressure sensor and pulse-taking instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110013234A (en) * | 2019-04-08 | 2019-07-16 | 清华大学深圳研究生院 | A kind of pliable pressure sensor and pulse-taking instrument |
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