CN112120702A - Flexible sole pressure detection device and shoes - Google Patents
Flexible sole pressure detection device and shoes Download PDFInfo
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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
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1036—Measuring load distribution, e.g. podologic studies
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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
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1036—Measuring load distribution, e.g. podologic studies
- A61B5/1038—Measuring plantar pressure during gait
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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
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/6804—Garments; Clothes
- A61B5/6807—Footwear
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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
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6829—Foot or ankle
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Abstract
The present disclosure relates to a flexible plantar pressure detection device, shoes, the device includes: the device comprises a flexible substrate layer, a functional layer, a flexible packaging layer and a processing module. The functional layer is arranged on the flexible substrate layer and comprises a plurality of flexible piezoresistive sensing units, a plurality of flexible piezoelectric sensing units and extensible leads for connecting the flexible piezoresistive sensing units and the flexible piezoelectric sensing units to the processing module; the flexible packaging layer is positioned above the functional layer and packages the functional layer together with the flexible substrate layer; the processing module is used for carrying out signal acquisition on the plurality of flexible piezoresistance sensing units and the plurality of flexible piezoelectric sensing units to obtain a plurality of piezoresistance signals and a plurality of piezoelectric signals, so that plantar stress data can be obtained according to the plurality of piezoresistance signals and the plurality of piezoelectric signals.
Description
Technical Field
The utility model relates to an intelligence shoe-pad technical field especially relates to a flexible plantar pressure detection device, shoes.
Background
The foot is the only part in contact with the ground in normal activities of human beings, and the pressure felt by each part of the sole of the foot is different along with different physiological activities, so the sole pressure becomes a more key characteristic quantity in daily life of human beings. Gait analysis generally refers to the study of human action and movement, and reveals the change of gait rules when human body is abnormal in function by studying human movement rules. The acquisition and detection of the plantar pressure signals have important significance for analyzing the dyssynchrony characteristics, the motion state and the physiological parameters of the human body.
In the related art, the existing plantar pressure measuring systems are mainly divided into three categories, namely a force measuring plate and a force measuring platform; plantar pressure imaging technology; force measuring shoes and insoles. Force plates and force tables are typically constructed from flat, rigid pressure sensing arrays that evaluate the static or dynamic balance capabilities of the body based primarily on pressure footprint and center of gravity, but are typically limited to laboratory use. The plantar pressure imaging technology can obtain the plantar structure and pressure distribution, but the testing process is complex and the cost is high. The force measuring shoe and insole measuring system usually integrates a flexible sensing unit into an insole, and a measuring surface is a contact surface of a sole and a sole, so that the measuring process is not limited by time and place, the measuring system becomes the most advanced technology in the current sole pressure measurement due to better flexibility, but the force measuring shoe and insole measuring system in the related technology has the problems of low measuring repeatability, poor stability, unstable received signals, high cost and the like.
Disclosure of Invention
In view of this, the present disclosure provides a flexible plantar pressure detection device and a shoe.
According to an aspect of the present disclosure, there is provided a flexible plantar pressure detection apparatus, the apparatus including: a flexible substrate layer, a functional layer, a flexible packaging layer and a processing module,
the functional layer is arranged on the flexible substrate layer and comprises a plurality of flexible piezoresistive sensing units, a plurality of flexible piezoelectric sensing units and extensible leads,
the flexible piezoresistive sensing unit comprises a stress layer, a piezoresistive sensing layer and piezoresistive electrodes, wherein the piezoresistive sensing layer is positioned above the flexible substrate layer, the stress layer is positioned above the piezoresistive sensing layer, and the piezoresistive electrodes comprise an upper piezoresistive electrode positioned above the piezoresistive sensing layer and a lower piezoresistive electrode positioned below the piezoresistive sensing layer;
the flexible piezoelectric sensing unit comprises a piezoelectric sensing layer and piezoelectric electrodes, wherein the piezoelectric sensing layer is positioned above the flexible substrate layer, and the piezoelectric electrodes comprise upper piezoelectric electrodes positioned above the piezoelectric sensing layer and lower piezoelectric electrodes positioned below the piezoelectric sensing layer;
the malleable wire for connecting the piezoresistive electrode, the piezoelectric electrode, to the processing module;
the flexible packaging layer is positioned above the functional layer and packages the functional layer together with the flexible substrate layer;
the processing module is used for collecting signals of the flexible piezoresistive sensing units and the flexible piezoelectric sensing units to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals so as to obtain sole stress data according to the piezoresistive signals and the piezoelectric signals,
the flexible substrate layer, the functional layer and the flexible packaging layer form the insole.
In a possible implementation manner, the flexible piezoresistive sensing units and the flexible piezoelectric sensing units are alternately arranged adjacent to each other, and at least one flexible piezoresistive sensing unit and at least one flexible piezoelectric sensing unit are arranged at the same detection position in the insole.
In one possible implementation, the processing module is disposed above the flexible substrate layer and encapsulated by the flexible encapsulation layer, or the processing module is disposed in the flexible substrate layer,
the processing module is located at a position corresponding to an arch area of the insole.
In one possible implementation, the processing module includes:
a power supply for powering the device;
the signal acquisition unit is used for acquiring signals of the flexible piezoresistive sensing units and the flexible piezoelectric sensing units to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals;
the processing unit is used for processing the plurality of piezoresistive signals and the plurality of piezoelectric signals to obtain sole stress data;
a storage unit for storing the plurality of piezoresistive signals, the plurality of piezoelectric signals and the plantar stress data;
and the wireless transmission unit is used for transmitting the plurality of piezoresistive signals, the plurality of piezoelectric signals and the sole stress data to a target device in a wireless communication mode.
In a possible implementation manner, a plurality of bulges are arranged on one surface of the stress layer, which is contacted with the piezoresistive sensing layer, and/or one surface of the stress layer, which is contacted with the piezoresistive upper electrode, the positions of the bulges correspond to the positions of the flexible piezoresistive sensing unit and the flexible piezoelectric sensing unit,
the raised structures include at least one of: prismatic, cylindrical, spherical, ellipsoidal, conical,
the height of the protrusions is 0.05mm-1mm, the length of the protrusions in the plane direction of the stress layer is 1mm-20mm, the width of the protrusions is 1mm-20mm, and the cross-sectional area of the protrusions is 1mm2-400mm2。
In one possible implementation mode, the structure of the stress layer comprises a porous structure, and the diameter of a hole in the porous structure is 0.5mm-20 mm.
In one possible implementation, the shape of the malleable wire includes at least one of: a snake shape, a paper-cutting shape and an island bridge shape,
the piezoelectric electrodes and the piezoresistive electrodes comprise interdigital electrodes and/or annular electrodes.
In one possible implementation, the detected positions of the plurality of flexible piezoresistive sensing units and the plurality of flexible piezoelectric sensing units in the insole correspond to at least one of the following areas: medial heel area, lateral midfoot area, metatarsal bone area, toe area.
In one possible implementation, the material of the piezoresistive sensing layer includes a composite material composed of a carbon nanomaterial and a flexible polymer, and the carbon nanomaterial includes any one of the following: graphene, carbon nanotubes, carbon black, graphdiyne, the flexible polymer comprising any one of: polydimethylsiloxane, thermoplastic polyurethane and water-soluble polyurethane.
According to an aspect of the present disclosure, there is provided a shoe including the above-described flexible plantar pressure detection apparatus.
The flexible plantar pressure detection device and the shoes provided by the embodiment of the disclosure have the characteristics of piezoresistance and piezoelectric double measurement mechanisms, have the characteristics of low cost, wide measurement range and high sensitivity, are not limited by external environment, human motion range and different structures of the soles of the human bodies, and can acquire the plantar motion signals of the human bodies anytime and anywhere. Meanwhile, the device is used as an insole, and has the advantages of long service life, stable acquisition frequency and high transmission efficiency. Has good measurement repeatability and measurement stability.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a schematic structural diagram of a flexible plantar pressure detection device according to an embodiment of the present disclosure.
Fig. 2 illustrates a cross-sectional view of a flexible plantar pressure detection device according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating distribution of detection positions of the flexible plantar pressure detection device according to an embodiment of the present disclosure.
Fig. 4 shows a schematic structural diagram of a force-bearing layer in a flexible plantar pressure detection device according to an embodiment of the present disclosure.
Fig. 5 is a schematic view illustrating a manufacturing method of a flexible plantar pressure detection device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 shows a schematic structural diagram of a flexible plantar pressure detection device according to an embodiment of the present disclosure. Fig. 2 illustrates a cross-sectional view of a flexible plantar pressure detection device according to an embodiment of the present disclosure. Where fig. 2 is a cross-sectional view taken along the location where ab is performed in fig. 1. As shown in fig. 1 and 2, the apparatus includes: a flexible substrate layer 7, a functional layer, a flexible encapsulation layer 8 and a processing module (not shown in the figure).
The functional layer is arranged on the flexible substrate layer 7 and comprises a plurality of flexible piezoresistive sensing units 1, a plurality of flexible piezoelectric sensing units 2 and extensible wires 3,
the flexible piezoresistive sensing unit 1 comprises a stress layer 9, a piezoresistive sensing layer 10 and a piezoresistive electrode 4, wherein the piezoresistive sensing layer 10 is located above a flexible substrate layer 7, the stress layer 9 is located above the piezoresistive sensing layer 10, and the piezoresistive electrode 4 comprises an upper piezoresistive electrode 41 located above the piezoresistive sensing layer 10 and a lower piezoresistive electrode 42 located below the piezoresistive sensing layer 10.
The flexible piezoelectric sensing unit 2 comprises a piezoelectric sensing layer 11 and a piezoelectric electrode 5, wherein the piezoelectric sensing layer 11 is located above the flexible substrate layer 7, and the piezoelectric electrode 5 comprises a piezoelectric upper electrode 51 located above the piezoelectric sensing layer 11 and a piezoelectric lower electrode 52 located below the piezoelectric sensing layer 11.
The malleable wires 3 are used to connect the piezoresistive electrodes 4, the piezoelectric electrodes 5 to the processing module.
The flexible encapsulating layer 8 is located above the functional layer, encapsulating the functional layer together with the flexible substrate layer 7.
The processing module is configured to perform signal acquisition on the plurality of flexible piezoresistive sensing units 1 and the plurality of flexible piezoelectric sensing units 2 to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals, so as to obtain sole stress data according to the plurality of piezoresistive signals and the plurality of piezoelectric signals.
The flexible substrate layer 7, the functional layer and the flexible packaging layer 8 form the insole.
In this embodiment, the flexible substrate layer 7, the flexible encapsulating layer 8, may be manufactured in the shape of an insole, so that the user of the insole can place the insole directly in the shoe. Or the insole can be directly used as a part of the shoe by a shoe manufacturer to finish the manufacture of the shoe.
In this embodiment, the apparatus may further include: shoe-pad protective sheath. The insole protective sleeve partially or completely wraps the insole to protect the insole.
In this embodiment, when the flexible piezoresistive sensing unit is under stress, the resistance value of the piezoresistive sensing layer changes, and the stress condition may also be determined according to the change of the resistance value. Under the condition of stress of the flexible piezoelectric sensing unit, an electric polarization phenomenon can occur in the piezoelectric sensing layer, so that the upper surface and the lower surface of the piezoelectric sensing layer (namely the two surfaces contacted by the upper piezoelectric electrode and the lower piezoelectric electrode) are electrified, and the stress condition can be determined according to the electrified condition. The processing module can detect the resistance value change of the flexible piezoresistive sensing unit and the electrification condition of the flexible piezoelectric sensing unit to obtain piezoresistive signals and piezoelectric signals. And then, the pressure resistance signals and the piezoelectric signals are analyzed and processed to obtain foot sole stress data so as to carry out gait feature analysis, motion state analysis, physiological data acquisition and the like on the basis of the foot sole stress data.
In a possible implementation manner, the flexible piezoresistive sensing units 1 and the flexible piezoelectric sensing units 2 are alternately arranged adjacent to each other, and at least one flexible piezoresistive sensing unit 1 and at least one flexible piezoelectric sensing unit 2 are arranged at the same detection position in the insole.
In the implementation mode, the flexible piezoresistance sensing unit and the flexible piezoelectric sensing unit are arranged at the same detection position, so that pressure detection can be realized through two modes of piezoresistance and piezoelectric, and the accuracy of finally obtained sole stress data can be ensured.
In one possible implementation, the detected positions of the plurality of flexible piezoresistive sensing units and the plurality of flexible piezoelectric sensing units in the insole correspond to at least one of the following areas: medial heel area, lateral midfoot area, metatarsal bone area, toe area.
For example, fig. 3 shows a schematic diagram of distribution of detection positions of the flexible plantar pressure detection device according to an embodiment of the present disclosure. As shown in FIG. 3, according to the stress condition of the foot, 15 detection positions in the figure can be selected to arrange the flexible piezoresistive sensing unit and the flexible piezoelectric sensing unit. Each detection position is at least provided with a flexible piezoresistance sensing unit and a flexible piezoelectric sensing unit, and a space is reserved between the two units so as to ensure the detection accuracy. The 15 detection positions shown in fig. 3 correspond to the big toe (position 15), the second toe (position 14), the third toe (position 13), the second little toe (position 12), the little toe (position 11), the first metatarsal (position 10), the second metatarsal (position 9), the third metatarsal (position 8), the fourth metatarsal (position 7) and the fifth metatarsal (position 6), the inner side of the heel (position 2), the outer side of the heel (position 3), the rear side of the heel (position 1), the outer side of the midfoot (position 4, position 5) of the human foot.
In one possible implementation, the processing module may include: the device comprises a power supply, a signal acquisition unit, a processing unit, a storage unit and a wireless transmission unit.
A power supply for supplying power to the device. And the signal acquisition unit is used for acquiring signals of the plurality of flexible piezoresistive sensing units and the plurality of flexible piezoelectric sensing units to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals. And the processing unit is used for processing the plurality of piezoresistive signals and the plurality of piezoelectric signals to obtain sole stress data. And the storage unit is used for storing the plurality of piezoresistive signals, the plurality of piezoelectric signals and the sole stress data. And the wireless transmission unit is used for transmitting the plurality of piezoresistive signals, the plurality of piezoelectric signals and the sole stress data to a target device in a wireless communication mode.
In this implementation, the processing unit may further process and analyze the plantar force data to obtain gait characteristics, motion state, relevant physiological data, and the like. The wireless transmission unit may transmit the piezoresistive signals, the piezoelectric signals and the sole stress data to a target device in a wireless Near Field Communication manner, such as bluetooth, Wi-Fi, Near Field Communication (NFC for short), infrared transmission, and the like. The target equipment can be a mobile phone, a computer and other terminal equipment of the insole user, so that the insole user can check the received data and perform further processing and analysis based on the received data. The target equipment can also be equipment used by hospitals, nursing homes, family members of users and the like where the insole users are located, so that other related personnel can monitor and analyze the related data of the insole users. In this way, under the action of the wireless transmission unit, the relevant person can view the data (the plurality of piezoresistive signals, the plurality of piezoelectric signals and the sole stress data) required to be viewed anytime and anywhere.
In this embodiment, the treatment module may be partially or entirely disposed in the insole for ease of use. In one possible implementation, the processing module is disposed above the flexible substrate layer and encapsulated by the flexible encapsulation layer, or the processing module is disposed in the flexible substrate layer. The processing module is located in a position corresponding to an arch region of the insole (region s shown in fig. 1). Wherein, the processing module can be disposed in the flexible packaging layer, which is not limited by the present disclosure.
In the implementation mode, the processing module is arranged at the position corresponding to the foot arch area of the insole, and the foot arch area is an area with relatively small stress on the foot, so that the processing module can be protected, the service life of the processing module is prolonged, and the reliability and the stability of the work of the processing module are ensured.
In one possible implementation manner, the signal acquisition unit in the processing module may be disposed in the insole, and the rest of the processing module may be disposed at other positions, for example, at other positions of the shoe, such as the sole of the shoe, the upper of the shoe, and the like, which is not limited by the present disclosure.
Fig. 4 shows a schematic structural diagram of a force-bearing layer in a flexible plantar pressure detection device according to an embodiment of the present disclosure. In one possible implementation manner, as shown in fig. 4, a plurality of protrusions 91 are provided on one surface of the force-bearing layer 9 contacting the piezoresistive sensing layer and/or one surface contacting the piezoresistive upper electrodes, and the positions of the protrusions correspond to the positions of the flexible piezoresistive sensing units and the flexible piezoelectric sensing units. The raised structures may include at least one of: prismatic, cylindrical, spherical, ellipsoidal, conical. The plurality of protrusions may be arranged in an array or a predetermined shape, which is not limited by the present disclosure.
The height of the protrusions can be 0.05mm-1mm, the length of the protrusions in the plane direction of the stress layer can be 1mm-20mm, the width of the protrusions can be 1mm-20mm, and the cross-sectional area of the protrusions can be 1mm2-400mm2。
In a possible implementation manner, the structure of the stress layer can comprise a porous structure, and the diameter of the holes in the porous structure is 0.5mm-20 mm. For example, the force-bearing layer may be a hollow foam-like structure.
In this implementation, the micro-structures such as the protrusions are arranged on the stress layer or the stress layer is arranged to be a multi-opening structure so as to ensure that the piezoresistive sensing layer can better respond to the stress and improve the detection precision and accuracy of the flexible piezoresistive sensing unit.
In one possible implementation, the material of the force-bearing layer may be a flexible polymer material such as polydimethylsiloxane, thermoplastic polyurethane, water-soluble polyurethane, and the like. Aiming at the difference of the stress layer structure, the stress layer can be processed and formed in different modes. For example, if the stress layer has a protrusion on a surface contacting the piezoresistive sensing layer, the stress layer may be etched by etching to obtain the protrusion. If the stress layer is of a porous structure, the preparation of the stress layer of the porous structure can be realized by adopting a dissolution method, a solution method and the like.
In one possible implementation, the material of the piezoelectric sensing layer may be polyvinylidene fluoride. The piezoelectric property of the obtained piezoelectric sensing layer can be changed by changing the solvent and the curing condition required by the preparation of the polyvinylidene fluoride according to the actual stress detection requirement.
In one possible implementation, the material of the flexible encapsulation layer may be a flexible polymer such as polydimethylsiloxane, polyimide, polyethylene terephthalate, silicone, hydrogel, and the like, which is not limited by the present disclosure. The preparation of the flexible packaging layer can be realized by adopting the modes of die casting, spin coating, blade coating, spray coating and the like. The material of the flexible substrate layer may be a low modulus flexible polymer such as thermoplastic polyurethane, water soluble polyurethane, and the like.
In one possible implementation, the shape of the malleable wire may include at least one of: snake shape, paper-cut shape, island bridge shape. The piezoelectric electrodes and the piezoresistive electrodes comprise interdigital electrodes and/or annular electrodes. The material of the ductile wire can be a material with good electric conductivity, such as a metal material of gold, copper, silver, and the like. Carbon materials such as carbon nanotubes and graphene may also be used.
In one possible implementation, the material of the piezoresistive sensing layer may include a composite material composed of a carbon nanomaterial and a flexible polymer, and the carbon nanomaterial may include any one of the following: graphene, carbon nanotubes, carbon black, graphdiyne, the flexible polymer may comprise any one of: polydimethylsiloxane, thermoplastic polyurethane and water-soluble polyurethane.
In this implementation, the carbon nanomaterial and the flexible polymer may be processed into a composite material by a blending method, a synthesis method, a solution method, and a layer-by-layer self-assembly method, so as to be used for preparing the piezoresistive sensing layer. After the composite material is prepared, a piezoresistive sensing layer film can be prepared by adopting methods such as layer-by-layer self-assembly, a blade coating method, a spraying method and the like, and then the piezoresistive sensing layer is obtained by etching the film.
For example, the carbon nanotubes are one-dimensional nanomaterials with good performance, and after the carbon nanotubes are compounded with the thermoplastic polyurethane, the carbon nanotubes with the fishing net-shaped structure can keep good electrical conductivity of the composite material under the non-planar condition by virtue of the flexibility of the thermoplastic polyurethane. The carbon nano tube and the thermoplastic polyurethane are compounded into the conductive paste in a blending mode, in the blending process, the flexible piezoresistive sensing units with different conductivities and sensitivities can be finally obtained by adjusting the proportion of the carbon nano tube and the polyurethane, the viscosity of the obtained conductive paste is controlled by adjusting the amount of the added solvent, and the uniformly mixed and uniformly dispersed composite conductive paste can be obtained by adjusting the blending parameters. The conductive paste is black and has good fluidity, the conductive paste is prepared into a flexible film, the conductive paste is prepared into a film by using a blade coating or tape casting film forming mode, and a solvent is evaporated at room temperature or under a heating condition, so that the ultrathin flexible piezoresistive sensing film is obtained. And cutting the piezoresistive sensing film by using a carving machine to finally obtain the flexible piezoresistive sensing layer.
The polydimethylsiloxane serving as the stress layer material has good ductility and air permeability, and a micro-nano convex structure is prepared on the polydimethylsiloxane by using a template method, so that the obtained polydimethylsiloxane microstructure has a good piezoresistive effect. The method comprises the steps of preparing microstructure bulges on polydimethylsiloxane, printing a microstructure silica gel mold in a three-dimensional direct-writing printing mode, and obtaining the bulges with the optimal size, shape and array arrangement through simulation in the mold designing process. And then preparing polydimethylsiloxane, regulating the proportion of a polydimethylsiloxane monomer and a curing agent, spin-coating the prepared polydimethylsiloxane on the microstructure protrusion die, regulating the rotating speed and time in the spin-coating process, and regulating and controlling the curing conditions of the polydimethylsiloxane, such as curing temperature, curing time, curing environment and the like, in the process of curing the polydimethylsiloxane so as to obtain a stress layer, thereby finally obtaining the flexible piezoresistive sensing unit with high stability and high sensitivity.
In one possible implementation, the flexible substrate layer and the flexible encapsulation layer may be bonded together using a bonding material such as a conductive adhesive.
The flexible plantar pressure detection device provided by the embodiment of the disclosure has the characteristics of piezoresistance and piezoelectric dual-measurement mechanism, and has the characteristics of low cost, wide measurement range and high sensitivity, is not limited by external environment, human motion range and different structures of human soles, and can acquire human plantar motion signals anytime and anywhere. Meanwhile, the device is used as an insole, and has the advantages of long service life, stable acquisition frequency and high transmission efficiency. Has good measurement repeatability and measurement stability.
The present disclosure also provides a method for preparing the above flexible plantar pressure detection device, which includes:
firstly, preparing a flexible substrate layer by using a flexible substrate material obtained in advance, wherein the shape of the flexible substrate layer is consistent with that of the insole to be prepared.
And secondly, preparing an extensible lead, a piezoelectric lower electrode and a piezoresistive lower electrode on the flexible substrate layer. The metal layer can be directly formed on the flexible substrate layer, and the extensible lead, the piezoelectric lower electrode and the piezoresistive lower electrode are obtained after patterning or etching is carried out on the metal layer.
And step three, preparing a piezoresistive sensing layer and a piezoelectric sensing layer on the flexible substrate layer by using the prepared composite material and piezoelectric sensing layer material. And preparing a piezoresistive upper electrode on the piezoresistive sensing layer; and preparing a piezoelectric upper electrode on the piezoelectric sensing layer to obtain a plurality of piezoelectric sensing units.
And fourthly, preparing stress layers on the piezoresistive sensing layers and the piezoresistive upper electrodes to form a plurality of piezoresistive sensing units and finish the preparation of the functional layer.
And fifthly, packaging the functional layer by using a flexible packaging layer material to obtain the device. The flexible substrate layer, the functional layer and the flexible packaging layer of the device form an insole.
Wherein, when the process module is also in the insole, the pre-prepared process module is placed at a designated location (corresponding to the arch area) on the flexible substrate layer before step five, and then encapsulated.
Wherein, before the third step, the method further comprises: and compounding the carbon nano material and the flexible polymer together to form the composite material for preparing the piezoresistive sensing layer.
In a possible implementation manner, fig. 5 shows a schematic diagram of a manufacturing method of a flexible plantar pressure detection device according to an embodiment of the present disclosure, and as shown in fig. 5, a flexible piezoresistive sensing unit and a flexible piezoelectric sensing unit may also be manufactured in advance. And preparing an extensible lead on the flexible substrate layer in the second step, then installing the piezoresistive sensing units and the piezoelectric sensing units at corresponding positions on the flexible substrate layer, and then executing the fifth step.
In the present embodiment, the execution sequence of the above steps may be adjusted as needed as long as the above device can be prepared, and the present disclosure does not limit this.
The insole manufactured by the manufacturing method of the flexible plantar pressure detection device provided by the embodiment of the disclosure has the characteristics of piezoresistance and piezoelectric dual-measurement mechanism, has the characteristics of low cost, wide measurement range and high sensitivity, is not limited by external environment, human motion range and different structures of the soles of the human bodies, and can acquire the plantar motion signals of the human bodies anytime and anywhere. Meanwhile, the device is used as an insole, and has the advantages of long service life, stable acquisition frequency and high transmission efficiency. Has good measurement repeatability and measurement stability.
The present disclosure also provides a shoe, which includes the above-mentioned flexible plantar pressure detection device.
It should be noted that, although the above embodiments are described as examples of the flexible plantar pressure detection device and the shoe, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, the user can flexibly set each part according to personal preference and/or actual application scene as long as the technical scheme of the disclosure is met.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A flexible plantar pressure detection device, characterized in that it comprises: a flexible substrate layer, a functional layer, a flexible packaging layer and a processing module,
the functional layer is arranged on the flexible substrate layer and comprises a plurality of flexible piezoresistive sensing units, a plurality of flexible piezoelectric sensing units and extensible leads,
the flexible piezoresistive sensing unit comprises a stress layer, a piezoresistive sensing layer and piezoresistive electrodes, wherein the piezoresistive sensing layer is positioned above the flexible substrate layer, the stress layer is positioned above the piezoresistive sensing layer, and the piezoresistive electrodes comprise an upper piezoresistive electrode positioned above the piezoresistive sensing layer and a lower piezoresistive electrode positioned below the piezoresistive sensing layer;
the flexible piezoelectric sensing unit comprises a piezoelectric sensing layer and piezoelectric electrodes, wherein the piezoelectric sensing layer is positioned above the flexible substrate layer, and the piezoelectric electrodes comprise upper piezoelectric electrodes positioned above the piezoelectric sensing layer and lower piezoelectric electrodes positioned below the piezoelectric sensing layer;
the malleable wire for connecting the piezoresistive electrode, the piezoelectric electrode, to the processing module;
the flexible packaging layer is positioned above the functional layer and packages the functional layer together with the flexible substrate layer;
the processing module is used for collecting signals of the flexible piezoresistive sensing units and the flexible piezoelectric sensing units to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals so as to obtain sole stress data according to the piezoresistive signals and the piezoelectric signals,
the flexible substrate layer, the functional layer and the flexible packaging layer form the insole.
2. The device of claim 1, wherein the flexible piezoresistive sensing units are alternately positioned adjacent to the flexible piezoelectric sensing units, and at least one flexible piezoresistive sensing unit and at least one flexible piezoelectric sensing unit are positioned at the same sensing location in the insole.
3. The apparatus of claim 1, wherein the processing module is disposed above and encapsulated by the flexible encapsulation layer or disposed in the flexible substrate layer,
the processing module is located at a position corresponding to an arch area of the insole.
4. The apparatus of claim 1, wherein the processing module comprises:
a power supply for powering the device;
the signal acquisition unit is used for acquiring signals of the flexible piezoresistive sensing units and the flexible piezoelectric sensing units to obtain a plurality of piezoresistive signals and a plurality of piezoelectric signals;
the processing unit is used for processing the plurality of piezoresistive signals and the plurality of piezoelectric signals to obtain sole stress data;
a storage unit for storing the plurality of piezoresistive signals, the plurality of piezoelectric signals and the plantar stress data;
and the wireless transmission unit is used for transmitting the plurality of piezoresistive signals, the plurality of piezoelectric signals and the sole stress data to a target device in a wireless communication mode.
5. The device according to claim 1, wherein the surface of the stress layer contacting the piezoresistive sensing layer and/or the surface contacting the piezoresistive upper electrode is provided with a plurality of protrusions, the positions of the protrusions correspond to the positions of the flexible piezoresistive sensing unit and the flexible piezoelectric sensing unit,
the raised structures include at least one of: prismatic, cylindrical, spherical, ellipsoidal, conical,
the height of the protrusions is 0.05mm-1mm, the length of the protrusions in the plane direction of the stress layer is 1mm-20mm, the width of the protrusions is 1mm-20mm, and the cross-sectional area of the protrusions is 1mm2-400mm2。
6. The device of claim 1, wherein the structure of the force-bearing layer comprises a porous structure having pores with a diameter of 0.5mm to 20 mm.
7. The device of claim 1, wherein the shape of the malleable wire comprises at least one of: a snake shape, a paper-cutting shape and an island bridge shape,
the piezoelectric electrodes and the piezoresistive electrodes comprise interdigital electrodes and/or annular electrodes.
8. The apparatus of claim 1, wherein the plurality of flexible piezoresistive sensing units, the plurality of flexible piezoelectric sensing units, and the sensed location in the insole correspond to at least one of: medial heel area, lateral midfoot area, metatarsal bone area, toe area.
9. The apparatus of claim 1, wherein the material of the piezoresistive sensing layer comprises a composite material of a carbon nanomaterial and a flexible polymer, the carbon nanomaterial comprising any of: graphene, carbon nanotubes, carbon black, graphdiyne, the flexible polymer comprising any one of: polydimethylsiloxane, thermoplastic polyurethane and water-soluble polyurethane.
10. A shoe, characterized in that it comprises a flexible plantar pressure detection device according to any one of claims 1 to 9.
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| CN202011014274.8A CN112120702A (en) | 2020-09-24 | 2020-09-24 | Flexible sole pressure detection device and shoes |
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