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Dynamic sole pressure test insole with multilayer sensing core structure

A plantar pressure and insole technology, which is applied in the field of pressure distribution measurement system, can solve the problems of lagging signal response, affecting the stability of pressure signal response and test accuracy, and low signal-to-noise ratio, so as to improve hysteresis and soft insoles , the effect of increasing the resolution

Inactive Publication Date: 2010-09-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of its own material and structure, the wearable flexible sensor unit will cause low signal-to-noise ratio and lag in response to signals when testing the dynamic pressure on flexible materials (such as: the pressure between the sole of the foot and the insole). And other problems, affecting the stability of the system's response to the pressure signal and the accuracy of the test

Method used

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  • Dynamic sole pressure test insole with multilayer sensing core structure
  • Dynamic sole pressure test insole with multilayer sensing core structure
  • Dynamic sole pressure test insole with multilayer sensing core structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The core structure film sensor unit is composed of 3 layers of PVDF piezoelectric film, and a hard PVC film is embedded between the film and the insole. Under the action of low frequency and low pressure, that is to simulate the state of the human body walking slowly, at this time, the response of the test system to the dynamic signal of small frequency and pressure is tested.

[0036] Test sample: an insole embedded with a sensing core structure film sensor unit composed of PVDF piezoelectric film, a single sensing unit.

[0037] Test equipment: MTS dynamic stretcher, equipped with a contact presser foot that simulates the material of the sole of the human body.

[0038] Test conditions: the signal frequency is 1.5Hz, and the applied pressure is 50N.

[0039] Test result: if Figure 5 shown. Under the action of low frequency and low pressure, the system output signal waveform is stable. Due to the use of 3-layer PVDF piezoelectric film, the sensor still exhibits a ...

Embodiment 2

[0041] The core structure film sensor unit is composed of 2 layers of PVDF piezoelectric film, and a hard PE film is embedded between the film and the insole. Under the action of high frequency and high pressure, it simulates the high-speed movement of the human foot. At this time, the frequency response of the test system to the collection of plantar dynamic signals is tested.

[0042] Test sample: an insole embedded with a sensing core structure film sensor unit composed of PVDF piezoelectric film, a single sensing unit.

[0043] Test equipment: MTS dynamic stretcher, equipped with a contact presser foot that simulates the material of the sole of the human body.

[0044] Test conditions: the signal frequency is 5.0Hz, and the applied pressure is 200N.

[0045] Test result: if Figure 6 shown. Under the action of high frequency and high pressure, the output signal waveform of the system is stable, the frequency response characteristic is remarkable, the signal variation co...

Embodiment 3

[0047] The plantar pressure distribution test of the system under normal wearing conditions, the pressure signals collected by multiple sensing units of the insole can describe the plantar pressure distribution of the human body when walking.

[0048] Test sample: insoles embedded with 6 thin film sensor units with a sensory core structure composed of 5 layers of PVDF piezoelectric films, and a hard PET film is embedded between each thin film sensor unit and the insole.

[0049] Test conditions: The test is carried out indoors. The insoles embedded with 5-layer sensing core structure PVDF piezoelectric film sensors are placed in flat sports shoes and worn. The signal conditioning unit is fixed on the tester's leg, and the step frequency is about 2.0Hz.

[0050] Test result: if Figure 7 shown. Under normal wearing conditions, the system works stably, the obtained signal response frequency is consistent with the actual stride frequency, the signal characteristics of each point...

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Abstract

The invention relates to a dynamic sole pressure test insole with a multilayer sensing core structure, which comprises an insole, a signal conditioning unit, a data acquisition unit and a signal display unit, wherein a sensing core structural film sensor unit is embedded into the insole; the sensing core structural film sensor unit is formed by vertically overlapping at least two layers of polyvinylidene fluoride films, and a hard synthetic material film is embedded between contact faces of the sensing core structural film sensor unit and the insole; and the sensing core structural film sensor unit in the insole is connected with the signal conditioning unit, the data acquisition unit and the signal display unit which are sequentially connected in series. The signal-to-noise ratio of a PVDF piezoelectric film sensor and the corresponding lag quality of the test insole on dynamic signals are improved by adopting the multilayer sensing core structure and the design of the spaced material films; and the test insole can be put into various daily worn shoes to perform test, and can provide the basis for biomechanical analysis of human gait and comfort evaluation of shoes.

Description

technical field [0001] The invention belongs to the field of pressure distribution measurement systems, in particular to a dynamic plantar pressure test insole with a multi-layer sensing core structure. Background technique [0002] The characteristics of plantar pressure distribution are one of the important indicators to reveal the law of human gait. The measurement of plantar pressure distribution has important guiding significance in the fields of biomechanics, rehabilitation medicine, orthopedic surgery, sports training, and shoemaking. The pressure test board and test bench technology currently used in clinical practice has great space limitations and is not wearable. Therefore, developing wearable pressure shoes or pressure insoles has become an important work in this technical field. The main products successfully developed are: American TEKSCAN company Mobile insole system, using TEKSCAN patented sensor, can provide gait pressure analysis, balance analysis and an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A43B17/00A61B5/103G01L1/16
Inventor 丁辛金曼甘以明杨旭东李毓陵王璐
Owner DONGHUA UNIV
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