CN111317478A - Dynamic sole monitoring foot pad based on flexible Hall pressure sensor - Google Patents
Dynamic sole monitoring foot pad based on flexible Hall pressure sensor Download PDFInfo
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- CN111317478A CN111317478A CN202010009918.8A CN202010009918A CN111317478A CN 111317478 A CN111317478 A CN 111317478A CN 202010009918 A CN202010009918 A CN 202010009918A CN 111317478 A CN111317478 A CN 111317478A
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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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- 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
- A61B5/6843—Monitoring or controlling sensor contact pressure
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Abstract
The invention belongs to the field of plantar pressure measurement, and particularly discloses a dynamic plantar monitoring foot pad based on flexible Hall pressure sensors, which comprises a foot pad structure, a plurality of flexible Hall pressure sensors and an acquisition module, wherein: the shape of the foot pad structure is the same as that of a sole to be detected, the plurality of flexible Hall pressure sensors are respectively installed on the foot pad structure according to the part to be detected of the sole to be detected, and the acquisition module is connected with the flexible Hall pressure sensors; the flexible Hall pressure sensor comprises a base, a linear Hall sensor, a flexible body and a permanent magnet, wherein a groove is formed in the base, the linear Hall sensor and the flexible body are both installed in the groove, the flexible body is located above the linear Hall sensor, and the permanent magnet is installed in the flexible body. The invention can dynamically record the plantar pressure information and the height change information of the arch of foot, explore the relation between the plantar pressure information and the height change information of the arch of foot, and provide a theoretical basis for researchers and doctors who research the foot.
Description
Technical Field
The invention belongs to the field of plantar pressure measurement, and particularly relates to a dynamic plantar monitoring foot pad based on a flexible Hall pressure sensor.
Background
In the aspect of plantar pressure measurement:
with the gradual improvement of the understanding of the foot medical treatment and the relation between the foot and the human motion function, the plantar pressure measuring technology is rapidly developed and widely applied to the fields of biomechanics, rehabilitation medical treatment, physical training and the like. Research shows that the sole pressure distribution characteristics of a hemiplegic patient and a normal person have obvious difference, the specific exercise condition of the patient can be obtained through sole pressure measurement and analysis, and the exercise rehabilitation training and evaluation of the patient can be assisted on the basis of the specific exercise condition, so that the method has practical value and practical significance for the exploration and development of a sole pressure measurement system.
The sensors used by the existing pressure foot pad are mainly made of thin film piezoelectric or piezoresistive materials, and are convenient to be embedded into the shoe pad and worn along with a human body. However, the output signal of the film sensing material is weak, so that the design difficulty of a subsequent conditioning circuit is higher; and most flexible sensors have the characteristics of densification, miniaturization and the like, and the sensors are generally expensive, too fragile or limited in performance and are mostly limited to one-dimensional pressure measurement.
In terms of arch monitoring:
since a person is required to walk, stand and jump continuously, the soles of the feet are required to have certain elasticity so as to buffer the impact of the ground on the body. The transverse arch and the inner and outer longitudinal arches form an arch elastic structure system with reasonable mechanical property on the foot, so that the stress of the sole is uniformly distributed, the nerves and blood vessels of the sole are protected, the shock is absorbed, and the brain and the viscera are protected from being damaged. It is therefore of great interest to discuss the composition and biomechanics of the transverse arch in continuous gait.
At present, most of the research on arches is static research, namely biomechanical analysis of two time points of load bearing and non-load bearing, but the research on the change of transverse arches of feet in continuous gait cycles and the movement rules and coordination mechanisms of all components is lacked.
There are two main methods of statically studying the arch of the foot, one being direct observation, which is judged by the clinician by the foot of the patient standing and sitting still, which is too dependent on the clinician's clinical ability and is highly subjective. The other is the foot print method, which is also the most common foot type classification method at present: the method comprises the steps of coating ink on the sole of a foot, standing and pressing the foot on flat white paper, and analyzing the foot after collecting a footprint. By measuring arch index: the Arch Index (I) ═ B/(a + B + C), where A, B, C represents the ink area on white paper for heel, midfoot, forefoot, respectively, thus classifying the foot types into three types of normal foot, high foot, and flat foot: the arch index of the normal foot type is 0.20-0.26, the arch index of the high foot type is lower than 0.20, and the arch index of the flat foot is higher than 0.26. However, the current conventional foot printing method is too complicated to operate and is limited to measurement in a static state.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a dynamic sole monitoring foot pad based on flexible Hall pressure sensors, which aims to dynamically record sole pressure information and height change information of an arch of foot by arranging a plurality of flexible Hall pressure sensors on a foot pad structure, explore the relation between the sole pressure information and the height change information of the arch of foot and provide a theoretical basis for researchers and doctors who research feet.
In order to achieve the above object, the present invention provides a dynamic sole monitoring foot pad based on flexible hall pressure sensors, which comprises a foot pad structure, a plurality of flexible hall pressure sensors and an acquisition module, wherein:
the shape of the foot pad structure is the same as that of a sole to be detected, the plurality of flexible Hall pressure sensors are respectively installed on the foot pad structure according to the part to be detected of the sole to be detected, and the acquisition module is connected with the flexible Hall pressure sensors;
the flexible Hall pressure sensor comprises a base, a linear Hall sensor, a flexible body and a permanent magnet, wherein a groove is formed in the base, the linear Hall sensor and the flexible body are both installed in the groove, the flexible body is located above the linear Hall sensor, and the permanent magnet is installed in the flexible body.
Preferably, the plurality of flexible hall pressure sensors are respectively installed in the heel area, the arch area, the metatarsal area and the toe area of the sole to be measured corresponding to the foot pad structure.
Preferably, a boss is arranged at a position, corresponding to the arch region of the foot to be measured, of the foot pad structure, so that the flexible hall pressure sensor at the arch region is higher than those at other positions.
More preferably, the pressure measuring range of the flexible hall pressure sensor in the heel region is 100Kpa to 500Kpa, the pressure measuring range of the flexible hall pressure sensor in the arch region is 100Kpa to 380Kpa, the pressure measuring range of the flexible hall pressure sensor in the metatarsal region is 100Kpa to 1400Kpa, and the pressure measuring range of the flexible hall pressure sensor in the toe region is 100Kpa to 1000 Kpa.
It is further preferred that the footpad structure includes a footpad base and a footpad support covering a surface of the footpad base, and that the footpad base and the footpad support are both made of a flexible material.
Preferably, the base, the linear hall sensor and the flexible body, and the flexible body and the permanent magnet are fixedly connected by glue.
As a further preferred, the flexible body is made of one or two of polydimethylsiloxane, thermoplastic biodegradable plastic.
As a further preferred, the base, the linear hall sensor and the flexible body are all cylindrical.
Preferably, the acquisition module is a single chip microcomputer.
More preferably, the number of the flexible Hall pressure sensors is 15-25.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention provides a dynamic sole monitoring foot pad combining sole pressure and arch height measurement, which has the advantages of simple structure, low cost and convenient use, can dynamically record sole pressure information and arch height change information, explores the relation between the information and provides theoretical basis for researchers and doctors who research feet.
2. The flexible Hall pressure sensor has the advantages of good repeatability, high sensitivity and precision, accurate acquired signals, direct contact between the flexible Hall pressure sensor and the sole, and guarantee of comfort in the process of acquiring the sole signals.
3. The acquisition module disclosed by the invention is small in size, can be directly tied on the ankle and is convenient to carry.
4. According to the invention, according to the pressure distribution characteristics of the sole, 15-25 flexible Hall pressure sensors with different pressure measurement ranges are arranged at the heel, the arch, the metatarsal region and each toe so as to comprehensively monitor each part of the sole.
Drawings
FIG. 1 is a schematic external view of a flexible Hall pressure sensor according to an embodiment of the invention;
FIG. 2 is a schematic cross-sectional structure diagram of a flexible Hall pressure sensor according to an embodiment of the invention;
FIG. 3 is a schematic view of a sole monitoring foot pad according to an embodiment of the present invention;
FIG. 4 is an exploded view of a monitoring foot pad structure for use under the sole of a foot in accordance with an embodiment of the present invention;
FIG. 5 is a schematic view of a sole monitoring footpad in accordance with an embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: the sensor comprises a flexible Hall pressure sensor 1, a foot pad substrate 2, a foot pad support 3, an acquisition module 4, a permanent magnet 11, a flexible body 12, a base 13 and a linear Hall sensor 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The dynamic sole monitoring foot pad based on the flexible hall pressure sensors, as shown in fig. 3 and 4, provided by the embodiment of the invention, comprises a foot pad structure, a plurality of flexible hall pressure sensors 1 and an acquisition module 4, wherein:
the foot pad structure has the same shape as the sole to be measured, and comprises a foot pad substrate 2 and a foot pad support 3 covering the surface of the foot pad substrate 2, wherein the foot pad substrate 2 and the foot pad support 3 are both made of flexible materials;
the flexible hall pressure sensor 1 is manufactured based on a hall effect, and as shown in fig. 1 and fig. 2, the flexible hall pressure sensor 1 comprises a base 13, a linear hall sensor 14, a flexible body 12 and a permanent magnet 11, wherein the base 13 is provided with a groove, the linear hall sensor 14 and the flexible body 12 are both installed in the groove, the flexible body 12 is positioned above the linear hall sensor 14, the upper end of the flexible body is provided with a groove, and the permanent magnet 11 is installed in the groove of the flexible body 12; the plurality of flexible Hall pressure sensors 1 are respectively and vertically arranged on the foot pad substrate 2 according to the parts to be measured of the soles to be measured, and the flexible body 12 is exposed on the insole support 3, so that the flexible body 12 is in direct contact with the soles and the comfort of a wearer is ensured; specifically, the part to be measured comprises a heel area, an arch area, a metatarsal area and a toe area, and is matched with the pressure distribution characteristics of the sole of a foot;
the acquisition module 4 is connected with the flexible Hall pressure sensor 1 by adopting a time-sharing sampling technology and is connected with a computer through a USB or a Bluetooth so as to transmit data to the computer; specifically, collection module 4 is STM32, FPGA or 51 singlechip, and the built-in analog-to-digital converter of STM32 can be digital quantity with the analog voltage numerical value conversion that flexible hall pressure sensor 1 gathered, and the rethread serial ports USB changes TTL and gives the host computer with data transmission.
Furthermore, a boss is arranged at the position of the foot pad structure corresponding to the foot arch of the foot to be measured, so that the flexible Hall pressure sensor 1 in the arch area is higher than the flexible Hall pressure sensors 1 at other positions, and the height change information of the arch is convenient to acquire.
Further, the base 13, the linear hall sensor 14 and the flexible body 12 are all cylindrical; the base 13, the linear Hall sensor 14 and the flexible body 12, and the flexible body 12 and the permanent magnet 11 are fixedly connected by glue; the flexible body 12 is made of one or two of Polydimethylsiloxane (PDMS) or thermoplastic biodegradable plastic (Ecoflex) through mold processing, and by controlling different proportions of PDMS and curing agent and curing temperature and using different types of Ecoflex, flexible bodies with different hardness can be formed, so that flexible Hall pressure sensors with various pressure measurement ranges can be manufactured.
Preferably, the pressure measuring range of the flexible Hall pressure sensor in the heel area is 100 Kpa-500 Kpa, and the flexible body is made of PDMS and a curing agent in a mass ratio of 16: 1; the pressure measuring range of the flexible Hall pressure sensor in the arch region is 100 Kpa-380 Kpa, and a flexible body of the flexible Hall pressure sensor is made of Ecoflex, PDMS and a curing agent in a mass ratio of 20: 1; the pressure measuring range of the flexible Hall pressure sensor in the metatarsal region is 100 Kpa-1400 Kpa, and the flexible body is made of PDMS and a curing agent in a mass ratio of 10: 1; the pressure measuring range of the flexible Hall pressure sensor in the toe area is 100 Kpa-1000 Kpa, and the flexible body is made of Ecoflex and PDMS and curing agent in a mass ratio of 12: 1.
Preferably, the number of the flexible hall pressure sensors 1 is 15-25, and more preferably 19.
The special type foot pad is designed for people with different foot sizes, for example, a 42-size foot is placed on a 42-size dynamic sole monitoring foot pad, and 19 flexible Hall pressure sensors 1 are arranged. When the dynamic sole monitoring foot pad is used, as shown in fig. 5, the foot pad is put into a shoe with the same size as the dynamic sole monitoring foot pad and is directly contacted with the sole; when a wearer moves, the flexible body 12 is deformed by external force applied by the sole of the foot to drive the permanent magnet 11 to move downwards, and at the moment, the magnetic flux at the linear Hall sensor 14 is changed, so that sole pressure information is sensed and displacement information of the flexible body 12 is obtained, and information of arch height change can be obtained according to the displacement information of the flexible body 12 at the arch. Further, by analyzing the information of the dynamic plantar pressure information and the change of the height of the arch, a gait analysis algorithm and the like, the relation between the dynamic plantar pressure information and the change of the height of the arch is explored, the plantar pressure distribution characteristics of a wearer can be directly obtained, the foot type of the wearer can be judged according to the height of the arch, and a theoretical basis is provided for researchers and doctors related to foot research.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a developments sole monitoring foot pad based on flexible hall pressure sensor which characterized in that, includes foot pad structure, a plurality of flexible hall pressure sensor (1) and collection module (4), wherein:
the shape of the foot pad structure is the same as that of a sole to be detected, the flexible Hall pressure sensors (1) are respectively installed on the foot pad structure according to the part to be detected of the sole to be detected, and the acquisition module (4) is connected with the flexible Hall pressure sensors (1);
the flexible Hall pressure sensor (1) comprises a base (13), a linear Hall sensor (14), a flexible body (12) and a permanent magnet (11), wherein the base (13) is provided with a groove, the linear Hall sensor (14) and the flexible body (12) are both installed in the groove, the flexible body (12) is located above the linear Hall sensor (14), and the permanent magnet (11) is installed in the flexible body (12).
2. The dynamic sole monitoring foot pad based on the flexible hall pressure sensors as claimed in claim 1, wherein a plurality of the flexible hall pressure sensors (1) are respectively installed on the heel area, the arch area, the metatarsal area and the toe area of the sole to be measured corresponding to the foot pad structure.
3. The dynamic sole monitoring foot pad based on the flexible hall pressure sensors as claimed in claim 2, wherein a boss is arranged on the foot pad structure corresponding to the arch region of the sole to be detected, so that the flexible hall pressure sensors (1) in the arch region are higher than those (1) in other positions.
4. The dynamic sole monitoring foot pad based on flexible hall pressure sensors according to claim 2, characterized in that the pressure measuring range of the flexible hall pressure sensors (1) of the heel region is 100Kpa to 500Kpa, the pressure measuring range of the flexible hall pressure sensors (1) of the arch region of the foot is 100Kpa to 380Kpa, the pressure measuring range of the flexible hall pressure sensors (1) of the metatarsal region is 100Kpa to 1400Kpa, and the pressure measuring range of the flexible hall pressure sensors (1) of the toe region is 100Kpa to 1000 Kpa.
5. The dynamic plantar monitoring foot pad based on the flexible hall pressure sensors of claim 1, wherein the foot pad structure comprises a foot pad base (2) and a foot pad support (3) covering the surface of the foot pad base (2), and the foot pad base (2) and the foot pad support (3) are both made of flexible materials.
6. The dynamic plantar monitoring foot pad based on the flexible hall pressure sensors according to claim 1, characterized in that the base (13), the linear hall sensors (14), the flexible body (12), and the flexible body (12) and the permanent magnet (11) are fixedly connected by glue.
7. The dynamic plantar monitoring foot pad based on flexible hall pressure sensors of claim 1, wherein the flexible body (12) is made of one or both of polydimethylsiloxane, thermoplastic biodegradable plastic.
8. The dynamic plantar monitoring foot pad based on flexible hall pressure sensors of claim 1, wherein the base (13), the linear hall sensors (14), and the flexible body (12) are all cylindrical.
9. The dynamic plantar monitoring foot pad based on the flexible hall pressure sensors of claim 1, wherein the acquisition module (4) is a single chip microcomputer.
10. The dynamic plantar monitoring foot pad based on flexible Hall pressure sensors according to any one of claims 1-9, characterized in that the number of flexible Hall pressure sensors (1) ranges from 15 to 25.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010009918.8A CN111317478A (en) | 2020-01-06 | 2020-01-06 | Dynamic sole monitoring foot pad based on flexible Hall pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010009918.8A CN111317478A (en) | 2020-01-06 | 2020-01-06 | Dynamic sole monitoring foot pad based on flexible Hall pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113384265A (en) * | 2021-05-20 | 2021-09-14 | 西安理工大学 | Portable foot type rapid detection equipment |
| CN114034418A (en) * | 2021-08-02 | 2022-02-11 | 上海大学 | Plantar pressure sensing insole based on photoelectric sensing |
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| EP1457128B1 (en) * | 2003-03-10 | 2007-10-03 | adidas International Marketing B.V. | Intelligent footwear and method for modifying a performance characteristic of an article of footwear |
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| CN114034418A (en) * | 2021-08-02 | 2022-02-11 | 上海大学 | Plantar pressure sensing insole based on photoelectric sensing |
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