CN112842274A - Air bag for fixed-point pressurization, fixed-point pressurization device and sensor system - Google Patents

Abstract

The airbag comprises an airbag cuff and a plurality of sub-airbags, wherein the airbag cuff is provided with air ports for inflation and exhaust, the sub-airbags are connected with the airbag cuff through respective air guide tubes, the air guide tubes of the sub-airbags have corresponding sizes according to the positions of the sub-airbags on the airbag cuff, and the sizes of at least one part of the air guide tubes are different from those of the rest air guide tubes, so that the sub-airbags corresponding to at least one part of the air guide tubes and the sub-airbags corresponding to the rest air guide tubes are inflated and pressurized to different degrees within the same inflation time, and the corresponding parts of a human body can be pressurized at fixed points when the airbag cuff is worn on the human body, particularly on a wrist. The fixed-point pressurizing device has good application prospect in the fields of digital traditional Chinese medicine pulse diagnosis, wearable electronic sphygmomanometers and the like.

Description

Air bag for fixed-point pressurization, fixed-point pressurization device and sensor system

Technical Field

The invention relates to medical detection equipment, in particular to a fixed-point pressurizing device and a sensor system.

Background

In the study and measurement of the cardiovascular system, pressurization is a common approach. The most common example is pulse diagnosis in TCM. The doctor of traditional Chinese medicine diagnoses the patient by looking at, smelling and asking for a cut, wherein the cut is the pulse feeling, namely the doctor applies three static pressures of different magnitudes of floating, middle and sinking to the three points of cunguanchi on the wrist of the patient through three fingers to obtain corresponding pulse signals. In the application occasion, the fixed-point compression of the three points of cunguan and chi is necessary, and the compression processes of the three points are independent and can be independently implemented, which is helpful for doctors to obtain more comprehensive pulse information. In western medicine, localized compression is also a common aid. For example, in the oscillometric blood pressure measurement process, continuously adjustable static pressure needs to be applied to the wrist to acquire the pulse amplitude under the corresponding pressure. In the tension method for measuring blood pressure, three sensors are required to be placed in the diameter direction of a blood vessel, and static pressure is applied; the diameter of the radial artery is about 2.4mm, which requires precise site-specific compression.

However, the existing pressurizing devices do not meet the requirements of these applications well. Some solutions use a manipulator that simulates a human hand to apply the pressure. The manipulator is often very complicated and large in size, and cannot meet the requirements of long-time carrying and real-time measurement. In other schemes, the pneumatic air bag cuff is used for pressurization, the air bag cuff is often a whole body, the pressure is applied to the whole wrist, and the requirement of independently pressurizing the three points of cunguan and chi cannot be met. The gas driving mode based on the cuff airbag and the pump valve structure is better in the aspects of safety, comfort and the like, so the gas driving is also a pressurization scheme used by a plurality of commercial bracelets or electronic sphygmomanometer watches. However, most of the pressurizing devices are complete air bags, and pressure is applied to the whole wrist.

It is to be noted that the information disclosed in the above background section is only for understanding the background of the present application and thus may include information that does not constitute prior art known to a person of ordinary skill in the art.

Disclosure of Invention

The present invention is directed to overcome the above problems in the prior art, and provides an airbag for fixed-point pressurization, a fixed-point pressurization device, and a sensor system.

In order to achieve the purpose, the invention adopts the following technical scheme:

the air bag for fixed-point pressurization comprises an air bag cuff and a plurality of sub air bags, wherein the air bag cuff is provided with air ports for inflation and exhaust, the plurality of sub air bags are connected with the air bag cuff through respective air guide tubes, the air guide tubes of the plurality of sub air bags are provided with corresponding sizes according to positions of the sub air bags on the air bag cuff, and the sizes of at least one part of the air guide tubes are different from those of the rest air guide tubes, so that the sub air bags corresponding to at least one part of the air guide tubes are different from those of the rest air guide tubes in inflation time, and the corresponding parts of a human body can be pressurized at fixed points when the air bag cuff is worn on the human body, particularly on a wrist.

Further:

the sub-air bags are distributed along the length direction of the air bag sleeve, and the size of the air duct of at least one sub-air bag positioned in the middle is larger than that of the rest air ducts.

The airway tube of the at least one sub-air sac at the middle position comprises a plurality of airway tubes, wherein the size of the airway tube at the middle is the largest, and the sizes of the airway tubes at two sides are gradually reduced in a symmetrical mode.

The air ducts of the sub-air bags have corresponding material properties according to the positions of the air ducts on the air bag cuffs, and preferably, at least one sub-air bag in the middle position is made of softer and more deformable material than the rest air ducts.

The airbag cuff comprises a plurality of sub-airbags independently arranged in parallel in the width direction of the airbag cuff, preferably 3 sub-airbags.

The utility model provides a fixed point pressure device, includes micropump, microvalve gasbag, baroceptor and processing apparatus, processing apparatus with the micropump reaches baroceptor connects, the micropump the microvalve with baroceptor all communicates the gasbag, baroceptor is used for detecting atmospheric pressure in the gasbag, the during operation the microvalve is closed, processing apparatus control the micropump aerify in the gasbag, work as baroceptor detects when atmospheric pressure in the gasbag reaches the setting value, processing apparatus control micropump stops aerifing, can open after the measurement the microvalve discharges gas in the gasbag.

A sensor system comprises a blood pressure or pulse sensor and a fixed-point pressurizing device, wherein the blood pressure or pulse sensor is connected with a processing device and arranged on an air bag, and when the air pressure sensor detects that the air pressure in the air bag reaches a set value, the processing device measures the blood pressure or pulse through the blood pressure or pulse sensor.

Further:

the blood pressure or pulse sensor is a flexible pressure sensor and comprises a first metal electrode layer, a first electret layer, a second electret layer and a second metal electrode layer which are sequentially laminated together, an air cavity is arranged between the first electret layer and the second electret layer, positive and negative charges ionized by air in the air cavity through corona polarization are respectively captured by the first electret layer and the second electret layer to form a charge dipole, the charge dipole and induced charges on the first metal electrode layer and the second metal electrode layer form electric field balance in an initial state, when the sensor is deformed under pressure, the dipole moment changes, the induced charge is transferred to form a current on an external circuit, when the pressure is released, the sensor is restored to the original state due to the elasticity of the sensor, and reverse current is formed on an external circuit and the electric field balance is restored.

The first electret layer and/or the second electret layer have a groove on an inner surface thereof; preferably, the first electret layer has a plurality of first strip-shaped grooves on an inner surface thereof, the first electret layer has a plurality of second strip-shaped grooves on an inner surface thereof, the second electret layer has a plurality of second strip-shaped grooves on an inner surface thereof, and the first strip-shaped grooves and the second strip-shaped grooves are opposite to each other, and preferably also perpendicular to each other.

An enclosed air cavity is formed by the first electret layer and the second electret layer together.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a fixed-point pressurizing device with pressure fixed-point distribution and controllable adjustment, which adopts a gas-driven pressurizing mode, a plurality of sub-air bags are connected with an air bag sleeve belt through respective air guide tubes, the air guide tubes have corresponding sizes according to the positions of the air guide tubes on the air bag sleeve belt, and the size of at least one part of the air guide tubes is different from that of the rest of the air guide tubes, so that the inflating and pressurizing degrees of the part of the sub-air bags and the rest of the sub-air bags are different in the same inflating time, and the corresponding parts of a human body can be pressurized at fixed points when the air bag sleeve belt is worn on the human body, particularly the wrist, therefore, higher pressure can be applied to the specific parts, and the effect of fixed-point pressurizing. When in use, the wearing position of the air bag cuff is adjusted, and the position of fixed-point pressurization can be flexibly adjusted. The fixed-point pressurizing device has good application prospect in the fields of digital traditional Chinese medicine pulse diagnosis, wearable electronic sphygmomanometers and the like.

In a preferable scheme, the multi-path adjustable fixed-point pressurizing effect is realized by the multi-path independent parallel arrangement of the plurality of sub-air bags. The pressure of each path can be independently adjusted, and the pressure can be regulated according to a preset threshold value, so that the requirement of multipoint fixed-point pressurization during pulse or blood pressure measurement can be well met.

The flexible pressure sensor of the preferred embodiment of the sensor system of the present invention has the ability to store charge stably for a long period of time, which allows the sensor to be used for a long period of time without any degradation in performance, i.e., has excellent stability, and is capable of measuring a pulse stably for a long period of time. In addition, the sensor has high sensitivity and can measure a pulse in a small area, which is very advantageous for measuring a fingertip pulse and a vein pulse. The sensor disclosed by the invention can be very light and thin, has good flexibility, can be well contacted with the surface of the skin to obtain a clearer pulse signal, and cannot cause discomfort to a user when being worn for a long time. The sensor is convenient to manufacture a plurality of sensors simultaneously, and the requirements of practical application on mass production and rapid manufacturing and forming are met.

Drawings

Fig. 1 is a schematic structural diagram of a system with a fixed-point pressurizing device according to an embodiment of the present invention.

Fig. 2 is a diagram illustrating the effect of the fixed point pressurizing device on the fixed point pressurizing of the wrist according to the embodiment of the invention.

Fig. 3 is a schematic structural diagram of a multi-channel fixed-point pressurizing device according to an embodiment of the present invention.

FIG. 4 is a flow chart of a sensor fabrication process according to an embodiment of the present invention.

Fig. 5a is a schematic structural diagram of a sensor according to an embodiment of the present invention.

Fig. 5b is a cross-sectional view of the sensor of fig. 5a taken along line I-I.

Fig. 5c is an exploded view of the sensor shown in fig. 5 a.

Fig. 6 illustrates the working principle of the sensor according to an embodiment of the present invention.

Fig. 7 is a block diagram of a sensor system according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described in detail below. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixed or coupled or communicating function.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 3, in an embodiment, a balloon for fixed-point compression includes a balloon cuff 5 and a plurality of sub-balloons 51, the balloon cuff 5 has a gas port for inflation and deflation, the plurality of sub-balloons 51 are connected to the balloon cuff 5 through respective gas-guide tubes 32, the gas-guide tubes 32 of the plurality of sub-balloons 51 have corresponding sizes according to the positions of the respective sub-balloons on the balloon cuff 5, and at least a part of the gas-guide tubes have different sizes from the rest of the gas-guide tubes, so that the sub-balloons 51 corresponding to the at least a part of the gas-guide tubes and the sub-balloons 51 corresponding to the rest of the gas-guide tubes are inflated and compressed to different degrees in the same inflation time, thereby the corresponding part of the human body can be compressed at a fixed point when the balloon cuff 5 is worn on the human body, especially on the wrist.

In a preferred embodiment, the plurality of sub-balloons 51 are distributed along the length direction of the balloon cuff 5, and the size of the airway of at least one sub-balloon 51 at the middle position is larger than the size of the rest of the airways.

In a more preferred embodiment, the airway of the at least one sub-balloon 51 in the intermediate position comprises a plurality of airways, wherein the airway in the middle is the largest in size and the airways on either side are progressively smaller in size in a symmetrical fashion.

In a preferred embodiment, the airways of the plurality of sub-balloons 51 have corresponding material properties according to the respective position on the balloon cuff 5, preferably at least one sub-balloon 51 in the intermediate position is of a softer, more deformable material than the remaining airways.

Referring to fig. 3, in a preferred embodiment, the airbag includes a plurality of sub-airbags 51 independently arranged in parallel in the width direction of the airbag cuff 5, preferably 3 sub-airbags 51, and 3 sub-airbags respectively form a size airbag cuff 5a, a closing airbag cuff 5b, and a size airbag cuff 5 c.

The embodiment of the invention provides a fixed-point pressurizing device with pressure distributed at fixed points and adjustable, which adopts a gas driving pressurizing mode, a plurality of sub-air bags are connected with an air bag cuff through respective air guide tubes, the air guide tubes have corresponding sizes according to the positions of the air guide tubes on the air bag cuff, and the size of at least one part of the air guide tubes is different from that of the rest of the air guide tubes, so that the inflating and pressurizing degrees of the part of the sub-air bags and the rest of the sub-air bags are different in the same inflating time, and the corresponding parts of a human body can be pressurized at fixed points when the air bag cuff is worn on the human body, particularly the wrist, therefore, higher pressure can be applied to the specific parts, and the effect of pressurizing at fixed points is achieved. When in use, the wearing position of the air bag cuff is adjusted, and the position of fixed-point pressurization can be flexibly adjusted. The fixed-point pressurizing device has good application prospect in the fields of digital traditional Chinese medicine pulse diagnosis, wearable electronic sphygmomanometers and the like.

In a preferred embodiment, the multi-path adjustable fixed-point pressurizing effect is realized by a plurality of layers of sub-airbags which are independently arranged in parallel in a multi-path mode. The pressure of each path can be independently adjusted, and the pressure can be regulated according to a preset threshold value, so that the requirement of multi-path fixed-point pressurization during pulse or blood pressure measurement can be well met.

Referring to fig. 1, in another embodiment, a fixed point pressurizing device includes a micro pump, a micro valve, an air bag, an air pressure sensor, and a processing device, where the processing device may be a circuit device with a microprocessor as a core, the processing device is connected to the micro pump and the air pressure sensor, the micro pump, the micro valve, and the air pressure sensor are all connected to the air bag through an air duct 31, the air pressure sensor is used to detect air pressure in the air bag, the micro valve is closed when the air pressure sensor works, the processing device controls the micro pump to inflate the air bag, when the air pressure sensor detects that the air pressure in the air bag reaches a set value, the processing device controls the micro pump to stop inflating, and after the measurement, the micro valve can be opened to exhaust the air in the air bag.

Referring to fig. 1 and 7, in another embodiment, a sensor system includes a blood pressure or pulse rate sensor and the fixed point pressurizing device, the blood pressure or pulse rate sensor is connected to the processing device and is disposed on the air bag, and the processing device measures blood pressure or pulse rate through the blood pressure or pulse rate sensor when the air pressure sensor detects that the air pressure in the air bag reaches a set value. The blood pressure or pulse sensor may be a plurality of sensors provided corresponding to the fixed-point compression portions.

Preferably, the blood pressure or pulse sensor is a flexible pressure sensor.

Referring to fig. 4 to 6, the flexible pressure sensor of the preferred embodiment includes a first metal electrode layer 101, a first electret layer 102, a second electret layer 103, and a second metal electrode layer 104 sequentially laminated together, the first electret layer 102 and the second electret layer 103 have an air cavity 105 between them, positive and negative charges ionized by corona polarization of the air in the air cavity 105 are captured by the first electret layer 102 and the second electret layer 103 to form charge dipoles, and the charge dipoles and induced charges on the first metal electrode layer 101 and the second metal electrode layer 104 form electric field balance in an initial state, when the sensor is deformed under pressure, the dipole moment changes, the induced charge is transferred to form a current on an external circuit, when the pressure is released, the sensor is restored to the original state due to the elasticity of the sensor, and reverse current is formed on an external circuit and the electric field balance is restored.

In a preferred embodiment, the first electret layer 102 and/or the second electret layer 103 have grooves on their inner surfaces. The groove pattern can be a periodic line groove pattern, a triangular pyramid groove pattern, a rectangular parallelepiped groove pattern, or the like, or a non-periodic, irregular groove pattern.

In a particularly preferred embodiment, the first electret layer 102 has a plurality of first strip-shaped grooves on its inner surface parallel to each other, and the second electret layer 103 has a plurality of second strip-shaped grooves on its inner surface parallel to each other, the first and second strip-shaped grooves being opposite to each other, and preferably also perpendicular to each other.

In various embodiments, the material of the first electret layer 102 and/or the second electret layer 103 may be selected from fluorinated ethylene propylene copolymer (FEP), polypropylene (PP), polyvinylidene fluoride (PVDF).

In various embodiments, the material of the first metal electrode layer 101 and/or the second metal electrode layer 104 may be selected from gold (Au), silver (Ag), copper (Cu), aluminum (Al), chromium (Cr).

In different embodiments, the first metal electrode layer 101 and/or the second metal electrode layer 104 may be formed by metal plating (such as metal vapor deposition), screen printing, or metal tape bonding.

In a preferred embodiment, an enclosed air cavity 105 is formed by the first electret layer 102 and the second electret layer 103.

Referring to fig. 4 to 6, in another embodiment, a method for manufacturing the high-sensitivity flexible pressure sensor includes the following steps:

manufacturing a first electret layer 102 and a second electret layer 103, and oppositely bonding the first electret layer 102 and the second electret layer 103 together, wherein an air cavity 105 is formed between the first electret layer 102 and the second electret layer 103;

forming a first metal electrode layer 101 on an outer surface of the first electret layer 102, and forming a second metal electrode layer 104 on an outer surface of the second electret layer 103;

wherein positive and negative charges ionized by corona polarization of the air in the air cavity 105 are respectively trapped by the first electret layer 102 and the second electret layer 103 to form a charge dipole.

In a preferred embodiment, said fabricating the first electret layer 102 and the second electret layer 103 comprises: grooves are formed on the opposing surfaces of the first electret layer 102 and/or the second electret layer 103 by laser engraving.

In various embodiments, the first electret layer 102 and the second electret layer 103 may be bonded by thermocompression bonding, chemical bonding, or glue bonding. .

Specific embodiments of the present invention are described further below by way of example.

Fixed-point pressurizing device

FIG. 1 is a schematic view of a layered balloon based site specific compression device.

The meter case 4 integrates elements such as a power supply, a pump valve, an air pressure sensor, a microprocessor and the like, and is used for realizing the control and regulation of pressure. When the micro-pump starts to work, the micro-pump is turned on by the microprocessor through the pump valve control circuit, the air bag cuff is inflated and pressurized, and the micro-valve is closed at the same time. The air pressure sensor is used for feeding back the air pressure in the air bag in real time, once a preset threshold value is reached, the microprocessor controls the micro pump to stop working, the air pressure in the air bag is kept near a preset pressure value, and at the moment, pulse measurement and other work can be carried out. When the pulse measurement is finished, the micro-valve is opened by the microprocessor, so that the gas in the air bag is rapidly discharged.

One side of the air bag cuff is connected with the micropump, the microvalve and the air pressure sensor through the air duct 31, so that the input and output of air and the feedback of air pressure are realized. The other side is connected with each sub-air sac through an air duct 32, and the corresponding air ducts 32 are different in thickness for different sub-air sacs. A thicker airway 32 means a greater degree of pressurization of the corresponding sub-balloon at the same time. To further enhance the effect of the site specific pressurization, the materials of the sub-balloons are different. The sub-air bags on the two sides can be made of harder and difficultly deformed materials, and the middle sub-air bag is made of softer and more easily deformed materials; under the same air pressure, the middle sub-air bag deforms more, and applies more pressure to the wrist, which helps to apply more pressure to a specific part, and has the effect of fixed-point pressurization.

Figure 2 shows the effect of a compression device based on a layered balloon design on the fixed point compression of the wrist. In order to realize the effect of multi-path independent pressurization, a plurality of structures designed in this way can be connected in parallel, such as a three-path independent pneumatic fixed-point pressurization structure shown in fig. 3.

Flexible pressure sensor

The sensor system of one embodiment is provided with a flexible pressure sensor that enables pulse or blood pressure measurements. Referring to fig. 4 to 6, in the flexible pressure sensor provided by the preferred embodiment of the present invention, there is an air cavity 105 between the first electret layer 102 and the second electret layer 103, and the air in the air cavity 105 is ionized into positive and negative charges through corona polarization, and the positive and negative charges are captured by the first electret layer 102 and the second electret layer 103 respectively to form a charge dipole, and the charge dipole and the induced charges on the metal electrode layers 101 and 104 form electric field balance in an initial state, when the sensor is deformed under pressure, the dipole moment is changed, the induced charges are transferred to form current on an external circuit, when the pressure is released, the sensor is restored due to the self elasticity, and a reverse current is formed on the external circuit and the electric field balance is restored, so that the flexible pressure sensor can sense the pulse of the pulse and output a corresponding current to realize the measurement of the pulse.

Since the electret material has the ability to stably store electric charges, this allows the sensor to be used for a long period without deterioration in performance, i.e., has excellent stability, and can stably measure a pulse for a long period of time. In addition, the sensor has high sensitivity and can measure a pulse in a small area, which is very advantageous for measuring a fingertip pulse and a vein pulse. The sensor provided by the embodiment of the invention can be very light and thin (50-100 mu m), has good flexibility, can be in good contact with the surface of the skin to obtain a clearer pulse signal, and does not cause discomfort to a user when being worn for a long time. A plurality of sensors can be manufactured simultaneously, and the requirements of practical application on mass production and rapid manufacturing and forming are met. The flexible pressure sensor provided by the embodiment of the invention has wide application prospects in the fields of pulse and other physiological signal measurement, electronic skin, human-computer interaction interfaces and the like.

In one embodiment, the flexible piezoelectric electret sensor is fabricated based on laser engraving and thermocompression bonding processes. Using a laser to cut line grooves in two electret films (FEP films are used as an example), placing the line grooves on the two FEP films perpendicular to each other, and thermocompression bonding to form a closed air cavity. After a metal electrode is evaporated on one side of the sensor, the sensor is charged by corona through a high-voltage power supply, and finally, a metal adhesive tape is attached to the other side of the sensor to serve as an electrode on the other side. In an alternative embodiment, the metal electrode subjected to vapor deposition can be replaced by an attached metal tape, so that the cost can be further reduced, the manufacturing period can be shortened, and the robustness of the sensor in long-term use can be improved.

FIG. 4 illustrates an example of a sensor fabrication flow. 101 denotes a first metal electrode layer; 102 denotes a first electret layer; 103 denotes a second electret layer; and 104 a second metal electrode layer. The material of the electret film used may be fluorinated ethylene propylene copolymer (FEP), polypropylene (PP), polyvinylidene fluoride (PVDF), etc., and here, FEP film is preferable; the metal electrode used may be gold (Au), silver (Ag), copper (Cu), aluminum (Al), chromium (Cr), or the like, and is preferably a Cu electrode. In order to achieve the effect of flexibility, the thickness of the electret film can be 10-100 μm, and is preferably 25 μm; the thickness of the metal electrode is 0.1 μm to 10 μm, and preferably 10 μm.

Since the electret film is thin, it is placed on a hard substrate in order to make the film flat and convenient for further processing. The selected hard substrate is flat and smooth, the surface energy is low, and the electret film can be torn off smoothly after subsequent treatment. The material of the hard substrate may be a copper plate, preferably 1mm thick. The electret film was laid flat on a hard substrate and wiped several times with a soft paper to remove dust from the electret film and make the electret film adhere to the hard substrate. A pattern of grooves is then engraved in the electret film. The engraving method used may be manual engraving, laser engraving, chemical agent etching based on a mask (e.g. a photolithography process, a screen mold, etc.), etc., where a laser engraving process is preferred. The groove patterns can be periodic line groove patterns, triangular pyramid groove patterns, rectangular parallelepiped groove patterns and the like, or non-periodic and irregular groove patterns. A line groove pattern is preferred here. Preferably, the depth of the grooves is as deep as possible without punching through the electret film.

Such groove delineation is performed on the two electret films 102, 103, respectively. Line grooves are preferred here, and are made perpendicular to one another on both films. Such two films are then placed against each other so that they bond together to form a closed air cavity. The bonding method used may be thermal compression bonding, chemical bonding, glue bonding, etc., and here thermal compression bonding is preferred. For the preferred FEP electret material, the parameters for thermal compression bonding are thermal compression for 90s at a pressure of 1MPa and a temperature of 250 ℃. After hot pressing, the two electret films form an integral body which can not be divided, and the groove patterns form a sealed air cavity.

A metal electrode layer 101 is then provided on one side of the electret film. The setting mode can be metal coating, screen printing, metal tape bonding and the like. A thinner metal layer can be obtained by metal coating and screen printing so as to obtain better flexible effect; they are expensive and time consuming. The metal tape bonding method is preferable here. Corona polarization was then performed using a dc high voltage power supply, a corona pin and a ground electrode. A specific embodiment is to place the metal electrode layer 101 on the ground electrode and a corona needle above the other side of the sensor (e.g. 3 cm). And applying negative high voltage (18 to 30kV) to the corona needle, and carrying out corona charging for 2-5 min. Finally, a metal electrode layer 104 is disposed on the other side of the electret film to complete the fabrication of the sensor. The arrangement mode can still be metal coating, screen printing, metal tape bonding and the like. Still preferred here is the manner of metal tape bonding.

Fig. 5a and 5b show the complete structure and the cross section along the line I-I of the sensor, respectively. Fig. 5c shows an exploded schematic view of the sensor. Fig. 6 shows the working principle of the sensor. During high voltage corona polarization, the air within the sealed cavity 105 will be broken down, ionizing equal amounts of positive and negative charges. Then, under the action of the electric field, the positive and negative charges move to the upper and lower sides respectively, and are finally captured by the inner walls of the electret films 102 and 103, so that a large number of charge dipoles are formed. In the initial state (i in fig. 6), the charge dipoles trapped on the trench walls of the electret thin film and the induced charges on the metal electrode form an electric field balance, and no electric response is generated. When the sensor is compressed and deformed (fig. 6) by sensing external pressure, dipole moment is changed, electric field balance is destroyed, and induced charges on the metal electrode are transferred to form current on an external circuit. When the pressure is released, the sensor elastically restores to its original shape, and an opposite current is generated in the external circuit (fig. 6 c). Therefore, the flexible pressure sensor can sense the pulse of the pulse and output corresponding current, thereby realizing the measurement of the pulse or the blood pressure.

This sensor continues to operate for years due to the ability of electret materials to stably store charge. In addition, the output property of the sensor is similar to that of a piezoelectric sensor, the sensor also has the characteristic of self-driving, an external power supply is not needed when the sensor works, and the effect of low power consumption is achieved. In addition, in the provided manufacturing process flow, laser cutting, hot-press bonding, corona polarization and metal tape pasting are very simple low-cost processes, are convenient for quick manufacturing and forming, and reduce the cost. In addition, in these processes, multiple sensors can be made simultaneously in the same batch, which facilitates mass production of the sensors; or the sensors with different sizes are produced in the same batch, so that the size can be conveniently adjusted.

Sensor system

Fig. 7 is a block diagram of a sensor system according to an embodiment of the present invention, which provides a digital pulse diagnosis apparatus capable of independently controllable fixed-point pressurization for cun, guan and chi directions.

The background of the present invention may contain background information related to the problem or environment of the present invention and does not necessarily describe the prior art. Accordingly, the inclusion in the background section is not an admission of prior art by the applicant.

The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the invention. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the claims.

Claims (10)

1. The air bag for fixed-point pressurization is characterized by comprising an air bag cuff and a plurality of sub air bags, wherein the air bag cuff is provided with an air port for inflation and exhaust, the plurality of sub air bags are connected with the air bag cuff through respective air guide tubes, the air guide tubes of the plurality of sub air bags are correspondingly sized according to positions of the sub air bags on the air bag cuff, and the sizes of at least one part of air guide tubes are different from those of the rest air guide tubes, so that the sub air bags corresponding to at least one part of air guide tubes are inflated and pressurized to different degrees from those of the rest air guide tubes in the same inflation time, and the corresponding parts of a human body can be pressurized at fixed points when the air bag cuff is worn on the human body, particularly a wrist.

2. The balloon of claim 1, wherein the plurality of sub-balloons are distributed along the length of the balloon cuff, and at least one of the sub-balloons at a central location has airway tubes of a size greater than the remaining airway tubes.

3. A balloon according to claim 2, wherein the airway of the at least one sub-balloon in the intermediate position comprises a plurality of airways, the middle airway being of the largest dimension and the airways on either side being of progressively smaller dimensions in a symmetrical fashion.

4. A balloon according to any of claims 1 to 3, wherein the airways of the plurality of sub-balloons have corresponding material properties in accordance with the respective locations on the balloon cuff, preferably at least one sub-balloon at an intermediate location is of a softer, more deformable material than the remaining airways.

5. An air-bag according to any one of claims 1 to 4, comprising a plurality of said sub-air-bags, preferably 3, arranged side by side independently in the width direction of the air-bag cuff.

6. A fixed-point pressurizing device, which comprises a micro pump, a micro valve, a gas bag, a gas pressure sensor and a processing device, wherein the gas bag is the gas bag according to any one of claims 1 to 5, the processing device is connected with the micro pump and the gas pressure sensor, the micro pump, the micro valve and the gas pressure sensor are all communicated with the gas bag, the gas pressure sensor is used for detecting the gas pressure in the gas bag, the micro valve is closed during operation, the processing device controls the micro pump to inflate in the gas bag, when the gas pressure sensor detects that the gas pressure in the gas bag reaches a set value, the processing device controls the micro pump to stop inflating, and after the measurement is finished, the micro valve can be opened to exhaust the gas in the gas bag.

7. A sensor system comprising a blood pressure or pulse rate sensor and the site pressurizing device of claim 6, wherein the blood pressure or pulse rate sensor is connected to the processing device and is disposed on the balloon, and the processing device measures the blood pressure or pulse rate by the blood pressure or pulse rate sensor when the air pressure sensor detects that the air pressure in the balloon reaches a set value.

8. The sensor system according to claim 7, wherein the blood pressure or pulse sensor is a flexible pressure sensor comprising a first metal electrode layer, a first electret layer, a second electret layer and a second metal electrode layer laminated in sequence, an air cavity is provided between the first electret layer and the second electret layer, positive and negative charges ionized by corona polarization of air in the air cavity are respectively captured by the first electret layer and the second electret layer to form a charge dipole, the charge dipole forms an electric field balance with induced charges on the first and second metal electrode layers in an initial state, when the sensor is deformed by pressure, the dipole moment changes, the induced charges transfer forms an electric current on an external circuit, when the pressure is released, the sensor is restored by self elasticity, a reverse current is formed on the external circuit and the electric field balance is restored.

9. The sensor system of claim 8, wherein the first electret layer and/or the second electret layer has a groove on an inner surface thereof; preferably, the first electret layer has a plurality of first strip-shaped grooves on an inner surface thereof, the first electret layer has a plurality of second strip-shaped grooves on an inner surface thereof, the second electret layer has a plurality of second strip-shaped grooves on an inner surface thereof, and the first strip-shaped grooves and the second strip-shaped grooves are opposite to each other, and preferably also perpendicular to each other.

10. The device for detecting pulse in real time according to any one of claims 8 to 9, wherein the first electret layer and the second electret layer together form an enclosed air cavity.

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