CN109602423B - Wearable device for preventing diabetic foot - Google Patents
Wearable device for preventing diabetic foot Download PDFInfo
- Publication number
- CN109602423B CN109602423B CN201910102247.7A CN201910102247A CN109602423B CN 109602423 B CN109602423 B CN 109602423B CN 201910102247 A CN201910102247 A CN 201910102247A CN 109602423 B CN109602423 B CN 109602423B
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- China
- Prior art keywords
- film
- electrode
- wearable device
- membrane
- spacing structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 208000008960 Diabetic foot Diseases 0.000 title claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims description 32
- 239000002033 PVDF binder Substances 0.000 claims description 14
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- 238000007747 plating Methods 0.000 claims description 4
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229920002799 BoPET Polymers 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229920009405 Polyvinylidenefluoride (PVDF) Film Polymers 0.000 description 1
- 206010040880 Skin irritation Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 206010012601 diabetes mellitus Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004112 neuroprotection Effects 0.000 description 1
- 230000036556 skin irritation Effects 0.000 description 1
- 231100000475 skin irritation Toxicity 0.000 description 1
- 230000036409 touch and pain Effects 0.000 description 1
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/486—Bio-feedback
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0247—Pressure sensors
Abstract
The utility model provides a wearable equipment for preventing diabetic foot, including first film and the interval structure of setting under first film, first film is the film that has piezoelectricity characteristic, upper surface and lower surface of first film are equipped with upper electrode and lower electrode respectively, first film is crooked when receiving external pressure effect, respond to external force and produce electric pulse signal in different regions correspondingly, be used for measuring pressure distribution, the interval structure is last to be distributed with a plurality of pits, wherein the upper surface of first film and lower surface produce piezoelectricity inverse effect after applying the potential difference through upper electrode and lower electrode, the effort that is brought by piezoelectricity inverse effect produces a prestressing force to first film through the interval structure, thereby increase the sense of touch feedback that first film produced when receiving external pressure. The invention has simple structure, easy processing and convenient measurement, is beneficial to the diabetics to adjust the stress distribution of the footsteps in time and reduces the stress concentration.
Description
Technical Field
The present invention relates to wearable devices, and in particular to a wearable device for preventing diabetic feet.
Background
The wearable device based on the PVDF film not only can convert external pressure into an electric signal, but also can generate acting force on the premise of potential difference, and can be applied to prevention and evaluation of diabetic foot.
Diabetics have less than normal ability to sense touch and pain, and are prone to skin rupture and infection due to lack of normal neuroprotection mechanisms, inability to sensitively sense external skin irritation. Patients are more prone to diabetic feet when the foot is subjected to repeated mechanical stresses of high intensity, particularly during walking and running. Currently, the mainstream diabetic foot prevention device combines a pressure sensor installed in a shoe and a smart watch worn on a hand to respectively monitor pressure distribution and real-time feedback of the foot, which requires complex system integration.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the wearable equipment for preventing diabetic foot, which can simply and effectively realize pressure distribution measurement and automatic tactile feedback.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a wearable device for preventing diabetic foot, the wearable device is placed on the sole of a user when in use, the wearable device comprises a first film and a spacing structure arranged under the first film, the first film is a film with piezoelectric characteristics, an upper electrode and a lower electrode are respectively arranged on the upper surface and the lower surface of the first film, the first film bends when being subjected to external pressure, electric pulse signals are correspondingly generated in different areas in response to external force so as to measure pressure distribution, a plurality of pits are distributed on the spacing structure, wherein piezoelectric inverse effect is generated after potential difference is applied on the upper surface and the lower surface of the first film through the upper electrode and the lower electrode, and a prestress is generated on the first film through the spacing structure by acting force caused by the piezoelectric inverse effect, so that tactile feedback generated when the first film is subjected to external pressure is increased.
Further:
the wearable device comprises a second film arranged under the interval structure, an electrode is arranged on the upper surface of the second film, a lower electrode of the first film and an electrode of the second film are respectively connected with a positive electrode and a negative electrode of a power supply, the interval structure separates the lower electrode of the first film and the electrode of the second film, the concave holes penetrate through the interval structure, and the lower electrode of the first film can be contacted with the electrode of the second film through the bending of the first film only when the first film is subjected to external pressure which is larger than a set threshold value, so that force feedback is generated through a piezoelectric inverse effect.
The first film and the second film are respectively adhered to the upper surface and the lower surface of the interval structure.
The first film is a polyvinylidene fluoride film.
The second film is a polyethylene terephthalate film.
The spacing structure is a grid array structure with a plurality of square meshes distributed.
The upper electrode and the lower electrode are plating layers.
The electrode of the second film is a plating layer.
The invention has the following beneficial effects:
the wearable device for preventing diabetic foot provided by the invention can simply and effectively realize pressure distribution measurement and automatic tactile feedback. The film prestress is applied through the interval structure, so that the feedback force of the film under the action of the piezoelectric inverse effect is increased. And moreover, the acting force of the external pressure on the film is reduced through the interval structure, and the pressure measurement range of the film is indirectly improved.
The invention has the advantages that:
1. the structure is simple, and the cost is low;
2. force feedback can be provided according to the structure, and redundant signal processing modules are not needed;
3. by structural configuration, the ambient pressure threshold at which force feedback occurs can be adjusted.
The invention has simple structure, easy processing and convenient measurement, and the system can output obviously increased force feedback, thereby helping diabetics to adjust the stress distribution of the footsteps in time and reducing stress concentration.
Drawings
FIG. 1 is a cross-sectional side view of a wearable device of an embodiment of the invention;
FIG. 2 is an internal top view of an embodiment of a wearable device of an embodiment of the present invention;
fig. 3a and 3b are schematic diagrams of force feedback action and electric signal output under different pressures according to a specific embodiment of the wearable device of the present invention.
Detailed Description
The following describes embodiments of the present invention in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
Referring to fig. 1 to 3b, in one embodiment, a wearable device for preventing diabetic foot, which is placed on the sole of a user's foot in use, the wearable device includes a first membrane 2 and a spacing structure 4 disposed under the first membrane 2, the first membrane 2 is a membrane having piezoelectric characteristics, an upper surface and a lower surface of the first membrane 2 are respectively provided with an upper electrode 1 and a lower electrode 3, the first membrane 2 is bent when being subjected to external pressure, electric pulse signals are correspondingly generated in different areas in response to the external force to measure pressure distribution, the spacing structure 4 is distributed with a plurality of pits, wherein the upper surface and the lower surface of the first membrane 2 generate a piezoelectric inverse effect after a potential difference is applied by the upper electrode 1 and the lower electrode 3, and the force due to the piezoelectric inverse effect generates a pre-stress on the first membrane 2 through the spacing structure 4, thereby increasing tactile feedback generated by the first membrane 2 when being subjected to external pressure.
In a preferred embodiment, the wearable device comprises a second membrane 6 arranged below the spacing structure 4, an electrode 5 is arranged on the upper surface of the second membrane 6, the lower electrode 3 of the first membrane 2 and the electrode 5 of the second membrane 6 are respectively connected with the positive electrode and the negative electrode of a power supply, the spacing structure 4 separates the lower electrode 3 of the first membrane 2 and the electrode 5 of the second membrane 6, the cavity penetrates through the spacing structure 4, and the lower electrode 3 of the first membrane 2 can be contacted with the electrode 5 of the second membrane 6 through the bending of the first membrane 2 only when the first membrane 2 is subjected to external pressure greater than a set threshold value, and the feedback of force is generated through the piezoelectric inverse effect.
In a preferred embodiment, the first film 2 and the second film 6 are adhered to the upper and lower surfaces of the spacer structure 4, respectively.
In a preferred embodiment, the first film 2 is a polyvinylidene fluoride film.
In a preferred embodiment, the second film 6 is a polyethylene terephthalate film.
In a preferred embodiment, the spacing structure 4 is a grid array structure with a plurality of square meshes distributed therein.
In a preferred embodiment, the upper electrode 1 and the lower electrode 3 are plated layers.
In a preferred embodiment, the electrode 5 of the second film 6 is a plating layer.
In one embodiment, the apparatus consists essentially of a polyvinylidene fluoride (PVDF) film, a polyethylene terephthalate (PET) film, and a spacer structure 4 to assist in film fixation and to provide pre-stress. The upper and lower surfaces of the PVDF film are respectively plated with an upper electrode 1 and a lower electrode 3, the upper surface of the PET film is plated with an electrode 5, and the PVDF film and the PET film are respectively adhered to the upper and lower surfaces of the interval structure 4.
The wearable device can be used for pressure distribution measurement and tactile feedback of the soles of a diabetic patient. The device can measure the pressure distribution of the surface and automatically provide tactile feedback when the pressure is greater than a certain threshold.
When the device is used, the device can be adhered to the socks, when the feet wear shoes to do exercises, the parts of the feet are affected by the concentrated stress action, the PVDF film is stressed and bent, and an electric pulse signal is output; the PVDF film is a film with piezoelectric property, and when the equipment is worn on a foot, different stress at different positions acts on the PVDF film to generate pulse signals with different amplitudes. Whereby the pressure distribution of the surface can be measured.
The device realizes that the feedback force of the film under the action of the piezoelectric inverse effect is increased by applying the film prestress: when potential difference is applied to the upper and lower surfaces of PVDF, a piezoelectric inverse effect generates acting force, and the spacing structure provides prestress for the PVDF film. When the membrane is subjected to external pressure, its stress increases, and when the PVDF membrane is subjected to a voltage, a very pronounced tactile (force) feedback is produced.
When the stress is larger than the pressure threshold, the PVDF film lower electrode 3 contacts with the PET film electrode 5, and the electrode 5 and the lower electrode 3 are respectively connected with the positive electrode and the negative electrode of the power supply, so that potential difference exists, and the piezoelectric inverse effect generates force feedback. Tactile feedback is automatically provided after the pressure is greater than a threshold. Through design interval structure, reduced the effort of external pressure to the film, indirectly promoted the pressure measurement range of film. When the equipment is subjected to external pressure, the PVDF film is bent, and only when the film is subjected to enough force, the film can touch the electrode on the bottom PET film, so that potential difference is generated, and further force feedback is generated, and the pressure threshold for the film to generate force feedback can be determined by the spacing structure and the geometric parameters of the film.
Fig. 3a and 3b show the force feedback action and the electrical signal output of a specific embodiment of the wearable device of the invention under different pressures (F1, F2, F3), respectively.
As shown in fig. 3b, a fabric layer may also be covered on top of the first film of the wearable device.
The foregoing is a further detailed description of the invention in connection with specific/preferred embodiments, and it is not intended that the invention be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the invention, and these alternatives or modifications should be considered to be within the scope of the invention.
Claims (8)
1. The wearable device for preventing diabetic foot is characterized in that the wearable device is placed on the sole of a user when in use, the wearable device comprises a first film and a spacing structure arranged below the first film, the first film is a film with piezoelectric property, an upper electrode and a lower electrode are respectively arranged on the upper surface and the lower surface of the first film, the first film bends when being subjected to external pressure, electric pulse signals are correspondingly generated in different areas in response to the external force so as to measure pressure distribution, a plurality of pits are distributed on the spacing structure, wherein piezoelectric inverse effect is generated on the upper surface and the lower surface of the first film after potential difference is applied by the upper electrode and the lower electrode, a prestress is generated on the first film by the action force caused by the piezoelectric inverse effect through the spacing structure, tactile feedback generated when the first film is subjected to external pressure is increased by applying the film prestress, and the pressure threshold value of the force feedback generated by the film is determined by the geometric parameters of the spacing structure and the film.
2. The wearable device of claim 1, wherein the wearable device comprises a second membrane disposed under the spacing structure, an electrode is disposed on an upper surface of the second membrane, a lower electrode of the first membrane and an electrode of the second membrane are respectively connected to a positive electrode and a negative electrode of a power source, the spacing structure separates the lower electrode of the first membrane and the electrode of the second membrane, the cavity penetrates through the spacing structure, and the lower electrode of the first membrane can be contacted with the electrode of the second membrane through bending of the first membrane only when the first membrane is subjected to external pressure greater than a set threshold value, and feedback of force is generated through piezoelectric inverse effect.
3. The wearable device of claim 2, wherein the first film and the second film are bonded to upper and lower surfaces of the spacer structure, respectively.
4. A wearable device according to any of claims 1 to 3, wherein the first film is a polyvinylidene fluoride film.
5. A wearable device according to any of claims 2 to 3, wherein the second film is a polyethylene terephthalate film.
6. A wearable device according to any of claims 1 to 3, wherein the spacing structure is a grid array structure with a plurality of square meshes distributed.
7. A wearable device according to any of claims 1 to 3, wherein the upper electrode and the lower electrode are plated.
8. A wearable device according to any of claims 2 to 3, wherein the electrode of the second membrane is a plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102247.7A CN109602423B (en) | 2019-02-01 | 2019-02-01 | Wearable device for preventing diabetic foot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102247.7A CN109602423B (en) | 2019-02-01 | 2019-02-01 | Wearable device for preventing diabetic foot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109602423A CN109602423A (en) | 2019-04-12 |
| CN109602423B true CN109602423B (en) | 2023-11-03 |
Family
ID=66021846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910102247.7A Active CN109602423B (en) | 2019-02-01 | 2019-02-01 | Wearable device for preventing diabetic foot |
Country Status (1)
| Country | Link |
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| CN (1) | CN109602423B (en) |
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