CN102793542A - Device for acquiring sole pressure and three-dimensional data of foot appearance - Google Patents
Device for acquiring sole pressure and three-dimensional data of foot appearance Download PDFInfo
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- CN102793542A CN102793542A CN2012102984097A CN201210298409A CN102793542A CN 102793542 A CN102793542 A CN 102793542A CN 2012102984097 A CN2012102984097 A CN 2012102984097A CN 201210298409 A CN201210298409 A CN 201210298409A CN 102793542 A CN102793542 A CN 102793542A
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- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 6
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
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- 229920002323 Silicone foam Polymers 0.000 claims 1
- 239000002657 fibrous material Substances 0.000 claims 1
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 239000013514 silicone foam Substances 0.000 claims 1
- 238000009530 blood pressure measurement Methods 0.000 abstract description 7
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- 210000002683 foot Anatomy 0.000 description 64
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- 239000004033 plastic Substances 0.000 description 2
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- 208000018737 Parkinson disease Diseases 0.000 description 1
- 208000000474 Poliomyelitis Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- Force Measurement Appropriate To Specific Purposes (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
The invention relates to a device for acquiring sole pressure and the three-dimensional data of foot appearance. The device comprises a sole pressure measurement system, a foot appearance three-dimensional measurement system and a data transmission system, wherein a thin film type pressure sensor is adopted by the sole pressure measurement system; the foot appearance three-dimensional measurement system comprises slow recovery foam, a three-dimensional scanner and a square box with the function of a shell, wherein the thin film type pressure sensor is flatly arranged on the bottom surface in the square box, and the slow recovery foam is arranged on the pressure sensor; and the three-dimensional scanner is equivalently arranged on the inclined top of the measured foot. The device can be used for measuring and acquiring the sole pressure and the three-dimensional data of the foot appearance at the same time, and is convenient to use and high in measurement accuracy; and the obtained data can be used for making pathological shoes or special insoles.
Description
Technical Field
The present invention relates to a device for measuring the pressure of the sole of a foot and the shape of the foot, in particular to an instrument for measuring the pressure of the sole of a foot and the shape of the foot, belonging to a device for measuring the human body for obtaining diagnostic data. The sole can also be called as sole; the foot may also be referred to as foot.
Background
Shoes worn by people are critical to the health of the foot. Healthy shoes not only adapt to the shape of the foot, but also balance the pressure of the sole of the foot. When special people such as diabetics have nerve injuries, the pressure peak value of the front supporting foot is increased; when the foot is ulcerated, the pressure of the anterior support foot increases abnormally. When the leg is affected, the sole pressure may also change abnormally. The pathological shoes suitable for the individual patients with malformed feet are manufactured according to the sole pressure and the three-dimensional parameters of the foot appearance, so that the shoes are comfortable to wear and convenient to walk; the special shoes for the diabetics, which are manufactured according to the sole pressure parameters, have great significance for protecting the feet of the diabetics. When the foot function rehabilitation evaluation, the curative effect evaluation and the operation correction effect identification are carried out on special crowds such as pregnant women, old people, poliomyelitis patients and the like and various foot disease patients, the sole pressure measurement is a significant objective index; the deep research of the sole pressure measurement in the field of clinical biomechanics is expected to make great progress in the gait research of patients with Parkinson's disease, hemiplegia, diabetes and the like.
The existing sole pressure data acquisition device adopts a pressure sensor, but because the volume of the pressure sensor is large, the installation of more sensors in a small area like the sole is difficult. For example, the Chinese patent CN201110074892.6 adopts 10 film pressure sensors corresponding to sole pressure distribution points; CN201010230489.3 adopts a matrix pressure sensor with 8 columns × 10 rows. These devices have a maximum of 1024 pressure sensors placed across the sole of the foot. Due to the small number of the pressure sensors, the obtained data cannot sufficiently reflect the comprehensive condition of the sole pressure.
A pair of suitable pathological shoes or special shoes are manufactured, and the three-dimensional shape data of the foot appearance is needed to be mastered while the sole pressure data is mastered. At present, the data of the two aspects are separately measured and collected by using different devices, and no device capable of simultaneously measuring the three-dimensional shape of the foot outline and the pressure of the sole exists. The separate measurement method cannot accurately locate the position of the increased sole pressure and is not used for displaying or analyzing the correlation between the change of the sole pressure and the shape of the foot.
The traditional foot shape measurement generally adopts a mode of foam plastics or plasticine impression, and the materials used by the method cannot be reused, so that the consumption is large and the environment is polluted. The impression taken is difficult to use when designing a custom shoe.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device capable of simultaneously measuring and collecting sole pressure and foot appearance three-dimensional data. The device is convenient to use and high in measurement precision. The obtained data is used for manufacturing pathological shoes or special insoles worn by abnormal feet.
The device for acquiring the three-dimensional data of the sole pressure and the foot appearance comprises a sole pressure measuring system, a foot appearance three-dimensional measuring system and a data transmission system. The structures of the respective portions are described below.
Sole pressure measuring system
The sole pressure measuring system adopts a film type pressure sensor and adopts a piezoresistor as a sensor probe. The piezoresistors are arranged in a matrix. Each piezoresistor matrix is arranged by regular rows and columns, the number of the longitudinal rows is 20-40 rows, and the number of the transverse columns is 10-40 columns. Every two piezoresistor matrixes form a group and are used for measuring one foot. The two piezoresistor matrixes in each group are arranged in a front-back mode and respectively correspond to the front half part and the rear half part of one sole.
And the upper surface and the lower surface of the sensor matrix are respectively covered with films printed with conducting circuits. Two ends of the piezoresistor are respectively led out from the conducting circuits on the upper and lower films, one side is led out in a row form, and the other side is led out in a column form. The row lines of the front half sole sensor matrix and the row lines of the rear half sole sensor matrix are correspondingly connected in an arrangement sequence, namely the first row of the front half sole sensor matrix is connected with the first row of the rear half sole sensor matrix; the second row of the first half sole sensor matrix is connected with the second row of the second half sole sensor matrix, and so on. The row line of the sensor is connected with a resistance-voltage conversion circuit and an analog-digital (AD) conversion circuit, and the column line of the sensor is connected with a scanning circuit. The voltage is applied from the column line of the sensor, and the scanning of up to 80 paths of the two feet is completed through the scanning control circuit.
The working principle of the sensor is as follows: when the pressure value of a certain sensor site needs to be collected, the row selecting one selector selects the row where the sensor is located to the high-speed operational amplifier, the column selecting one selector selects the column where the sensor is located to the high-speed operational amplifier, meanwhile, other unselected rows and columns are suspended, and after effective signal establishing time, the pressure value of the selected sensor appears at the output end of the high-speed operational amplifier. The high-speed analog-to-digital converter (ADC) converts the pressure signal output by the operational amplifier into a digital signal, and transmits the digital signal to the PC computer through a parallel interface or a universal serial bus for data processing.
The resistance value of the sensor is converted into a voltage signal through a resistance-voltage conversion circuit, the voltage signal is converted into a digital signal through an analog-digital conversion circuit, the digital signal is processed into 256-step color blocks through a computer and displayed on corresponding positions of a display, different color levels represent the magnitude of pressure values, and the color blocks are darker when the pressure is larger.
(II) foot shape three-dimensional measuring system
The foot contour three-dimensional measurement system includes a slow recovery foam and a three-dimensional scanner, and a cube that functions as a housing. The slow recovery foam is closed-cell flexible foam or short fiber filling material, and can be selected from polyurethane foam, organosilicon foam, modified organosilicon filling inorganic short fiber and other materials. The slow recovery foam was placed in a square box slightly larger than the sole of the feet. The bottom of the cassette is flat with a thin film type pressure sensor and the slow recovery foam is placed over the pressure sensor membrane. A gap of 1-5 mm is left between the slow recovery foam and the inner wall of the outer box. The significance of this gap is that when the slow recovery foam is pedaled, the slow recovery foam in the non-pedaled portion can remain flat. Otherwise, if there is no gap between the slow recovery foam and the outer box, the portion of the upper surface of the foam not stepped on by the foot may be deformed by the squeezing of the box wall, affecting the accuracy of the three-dimensional scanning.
The two scanners are respectively and fixedly arranged above the two feet, and each pair of the scanners scans one foot. The scanner is directly connected to the computer. The three-dimensional scanner may be monocular or binocular, and may also be photographic.
(III) data transfer system
The data transmission mode of the invention can adopt wired transmission or wireless transmission, and the wired transmission can adopt a USB connecting line for transmission; the wireless transmission can be selected from Bluetooth, infrared or ultrasonic transmission.
The thin film pressure sensor is placed below the slow recovery foam, so that the foot pressure measurement is carried out while the three-dimensional data of the foot appearance is acquired, and the pressure acquisition points can be conveniently corresponding to the foot appearance. The invention uses a scanner probe with a fixed position for each foot to respectively scan the foot surface, ankle and sole impression, and the two images of the foot surface and the sole are easily synthesized into a complete foot outline three-dimensional model through corresponding software. The generated three-dimensional model is a digital model and is very convenient to be applied to the design of a customized insole or a customized shoe.
The invention adopts a printing method to manufacture the pressure sensor, adopts a matrix connection mode, and can install more sensors in a smaller area. The number of the piezoresistor probes of the sensor reaches 80 multiplied by 40, which is several times to dozens of times of the number of the sensors in the traditional method.
Compared with the prior art of one sensor array, the design of connecting two sensor arrays under each foot in parallel does not increase the number of analog-to-digital converters while increasing the number of the pressure sensitive resistance detecting heads. The outgoing line of the sensor is led out from the middle of the two matrixes of the piezoresistor, so that the sensor can be cut according to the size of different pins and the effect is not influenced.
The traditional method is characterized in that 16 levels of color levels are used for displaying, and the pressure value of the sensor is converted and then displayed by 256 levels of color levels.
The invention uses slow recovery foam, which can be used repeatedly. Compared with the prior art which uses common foam plastics, the cost is low and the pollution is less.
Drawings
FIG. 1 is a schematic view of the sensor configuration for measuring plantar pressure according to the present invention;
fig. 2 is a schematic diagram of the connection of the piezoresistor of the thin film type pressure sensor. Wherein, the A picture is the upper part, and the B picture is the lower part;
FIG. 3 is a schematic diagram of a layered structure of a thin film type pressure sensor;
FIG. 4 is a schematic view of the operating principle of the plantar pressure measuring system;
FIG. 5 is a schematic view of a foot contour three-dimensional measurement system in use. Wherein, the A picture is the pedal state, and the B picture is the concave die state after the tested foot is removed.
The components or portions denoted by reference numerals in the drawings are: 1-piezoresistor wire led out according to matrix row; 2, leading out a piezoresistor lead according to a matrix array; 3-a voltage dependent resistor; 4, connecting the piezoresistor with a wire in parallel; 6-three-dimensional scanner; 7-thin film type pressure sensor; 8, square boxes; 9-slow recovery foam; 10-sole cavity die; 11-printing a conductive layer; 13-plastic film base.
Detailed Description
As shown in fig. 5, the groove-shaped cube 8 is made of a hard material. The length and width of the square box 8 are determined according to the size of feet of a crowd who performs foot measurement, and after two feet to be measured are stepped on, the distance between the periphery of the feet and the side wall of the square box 8 is not less than 2cm, and the distance between the two feet is allowed to be 5-10 cm.
A film type pressure sensor 7 is placed flat on the bottom of the square box 8, and a slow recovery foam 9 is placed on the pressure sensor 7. The foam thickness is 15-30 mm. The slow recovery foam 9 is made of polyurethane foam, organosilicon foam, modified organosilicon filling inorganic short fiber and other materials. Gaps of 1-5 mm are reserved between the periphery of the slow recovery foam 9 and the inner wall of the square box 8. The two three-dimensional scanners 6 are respectively arranged on the left and right of the tested foot and are fixed with the square box 8 or fixed in a dismounting way. Adjusting the scanner height enables the scan range to be related to the entire foot and ankle.
As shown in fig. 1 to 3, in the above machine structure, the piezoresistors 3 as the probes of the pressure sensor 7 are arranged in a matrix, and each piezoresistor matrix is composed of 40 × 40 piezoresistors, i.e., 40 rows and 40 columns. The sole pressure measuring system comprises two groups of four piezoresistors 3, and every two piezoresistors 3 form a group. The two groups of piezoresistors 3 are respectively corresponding to the left foot and the right foot. The two piezoresistors 3 in each group are respectively corresponding to the front half part and the rear half part of one sole.
The upper and lower surfaces of the matrix of piezoresistors 3 are covered with films 13 on which conductive traces 11 are printed, respectively. The leads at the two ends of the piezoresistor 3 are respectively led out from the conducting circuits 11 on the upper and lower surfaces of the film, one surface leads out the leads 1 in a row form, and the other surface leads out the leads 2 in a column form. The row lines 1 of the front half sole sensor matrix are correspondingly connected with the row lines 1 of the rear half sole sensor matrix in a one-to-one correspondence mode according to the arrangement sequence, namely the first row of the front half sole sensor matrix is connected with the first row of the rear half sole sensor matrix; the second row of the first half sole sensor matrix is connected with the second row of the second half sole sensor matrix, and so on. The row line 1 of the sensor is connected with a resistor-voltage conversion circuit and an analog-digital conversion circuit; the column line 2 of the sensor is used for connecting with a scanning circuit, voltage is applied from the column line 2 of the sensor, and the scanning of 80 paths of two pins is completed through a scanning control circuit.
The pressure sensor 7 is connected with a computer through a lead.
The data transmission system can adopt wired transmission or wireless transmission, and the wired transmission can adopt a USB connecting line for transmission; the wireless transmission can be selected from Bluetooth, infrared or ultrasonic transmission.
When in use, a testee steps two feet on the slow recovery foam to stand upright and stable, and the slow recovery foam is extruded to become the concave die 10 corresponding to the shape of the sole of the foot. At this time, the pressure sensor 7 measures the distribution of the sole pressure, and the three-dimensional scanner 6 three-dimensionally scans the instep and ankle.
The pressure measurement process of the sole of the foot is completed by the logic control unit. As shown in fig. 4, the procedure of measuring the sole pressure is that a foot is selected, the control unit sends a signal to the row-to-column multi-channel selection controller, a first column is selected, then the control unit sends a signal to the row-to-row multi-channel selection controller, 1-40 rows corresponding to the first column are sequentially powered on line by line, the switching power-on function is completed by the row-to-multi-channel selection controller, and pressure values on 40 sensors intersecting with the first column are acquired; then selecting a second column, and scanning 1-40 rows corresponding to the second column line by line; this process is repeated until all 40 columns are collected. After which a column-by-column line-by-line scan of the other leg is performed. The collected signals are amplified by the high-speed operational amplifier and then converted into digital signals by the high-speed analog-to-digital converter, and the digital signals are transmitted to a PC computer for processing through a parallel interface or a universal serial bus.
When the pressure distribution data of the sole and the three-dimensional image of the instep are collected, the tested foot is moved away, the concave die 10 is left on the slow recovery foam in the shape of the sole, and the three-dimensional scanner is started to carry out three-dimensional scanning on the concave die 10. The collected three-dimensional images of the foot appearance are spliced by a foot sole three-dimensional pressure measurement and analysis system compiled by the advanced technical research institute of Chinese academy of sciences or other available programs to obtain the three-dimensional image data of the whole foot, and the three-dimensional image data is loaded into a control system of a numerical control machining center to manufacture shoes or insoles which are adaptive to the three-dimensional images.
The slow recovery foam 9 recovers about one minute after the foot is removed and the next sample can be taken.
The invention realizes that one machine is used for simultaneously measuring the pressure of the sole of the foot and the three-dimensional shape of the foot appearance. The obtained data can be used for manufacturing pathological shoes for people with foot diseases, special shoes for special people and customized shoes for normal people; can also be used for manufacturing special insoles and inserts in the shoes sold in the market, and solves the needs of different individuals.
Claims (9)
1. A device for collecting sole pressure and foot appearance three-dimensional data is characterized by comprising a sole pressure measuring system, a foot appearance three-dimensional measuring system and a data transmission system; wherein,
the sole pressure measuring system adopts a film type pressure sensor;
the foot appearance three-dimensional measurement system comprises slow recovery foam, a three-dimensional scanner and a square box playing a role of a shell, wherein a thin film type pressure sensor is horizontally arranged on the inner bottom surface of the square box, and the slow recovery foam is arranged above the pressure sensor; and a three-dimensional scanner is arranged obliquely above the tested foot, and is fixedly connected with the square box.
2. The apparatus for collecting three-dimensional data of foot sole pressure and foot contour according to claim 1, wherein said thin film type pressure sensor uses piezoresistors as sensor probes, the piezoresistors being arranged in a matrix form; each piezoresistor matrix is laid out by regular rows and columns, the number of longitudinal rows is 20-40 rows, and the number of transverse columns is 10-40 columns; every two piezoresistor matrixes form a group and are used for measuring one foot; the two piezoresistor matrixes in each group are arranged in a front-back mode and respectively correspond to the front half part and the rear half part of one sole.
3. The apparatus for collecting three-dimensional data of sole pressure and foot contour according to claim 2, wherein the upper and lower surfaces of the sensor matrix are covered with films printed with conductive traces, respectively, and both ends of the piezoresistor are led out by the conductive traces on the upper and lower surfaces of the films, respectively, one side is led out in a row form and the other side is led out in a column form; the row lines of the front half sole sensor matrix are correspondingly connected with the row lines of the rear half sole sensor matrix in a one-to-one manner according to the arrangement sequence; the row line of the sensor is connected with the resistance-voltage conversion circuit and the analog-digital conversion circuit, and the column line of the sensor is connected with the scanning circuit.
4. The device for acquiring plantar pressure and foot contour three-dimensional data according to claim 1, wherein the slow recovery foam is a polyurethane foam, or a silicone foam, or a modified silicone-filled inorganic short fiber material.
5. The apparatus for collecting three-dimensional data of sole pressure and foot contour according to claim 1, wherein there is a gap of 1-5 mm between the slow recovery foam and the inner wall of the cube.
6. The apparatus for acquiring plantar pressure and foot contour three-dimensional data according to claim 1, wherein the three-dimensional scanner is monocular or binocular, or photographic.
7. The apparatus for acquiring three-dimensional data of sole pressure and foot contour according to claim 1, wherein said data transmission system is wired transmission or wireless transmission.
8. The device for collecting plantar pressure and foot contour three-dimensional data according to claim 7, wherein the wired transmission is a USB cable transmission.
9. The device for acquiring plantar pressure and foot contour three-dimensional data according to claim 7, wherein the wireless transmission is Bluetooth, or infrared, or ultrasonic transmission.
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| CN201210298409.7A CN102793542B (en) | 2012-08-21 | 2012-08-21 | Device for acquiring sole pressure and three-dimensional data of foot appearance |
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| CN201210298409.7A CN102793542B (en) | 2012-08-21 | 2012-08-21 | Device for acquiring sole pressure and three-dimensional data of foot appearance |
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| CN102793542A true CN102793542A (en) | 2012-11-28 |
| CN102793542B CN102793542B (en) | 2014-11-26 |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104647757A (en) * | 2015-01-26 | 2015-05-27 | 刘轶 | Manufacturing method for 3D (three-dimensional) printing shoe pad |
| CN104699908A (en) * | 2015-03-24 | 2015-06-10 | 唐力 | Manufacturing method for 3D orthopedic insole |
| CN104997515A (en) * | 2015-07-28 | 2015-10-28 | 安徽工程大学 | Plantar pressure distribution measurement device |
| CN105021327A (en) * | 2015-07-28 | 2015-11-04 | 芜湖科创生产力促进中心有限责任公司 | Circular ring type contact parallel plate three dimensional pressure transducer |
| CN105054953A (en) * | 2015-07-28 | 2015-11-18 | 安徽机电职业技术学院 | Clinical treatment effect evaluation system based on sole pressure distribution |
| CN106092379A (en) * | 2016-06-14 | 2016-11-09 | 中国科学院合肥物质科学研究院 | A kind of ectoskeleton disabled aiding robot inflated type pressure transducer |
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| CN106263139A (en) * | 2015-05-13 | 2017-01-04 | 汉琦国际有限公司 | Topology foot cover and preparation method thereof |
| CN106821389A (en) * | 2017-01-20 | 2017-06-13 | 合肥工业大学 | A kind of gait foot force distribution measurement method |
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| CN107874762A (en) * | 2017-12-25 | 2018-04-06 | 张新举 | A kind of sole shape harvester |
| CN107928677A (en) * | 2017-12-25 | 2018-04-20 | 张新举 | A kind of sole shape harvester and sole shape acquisition method |
| CN108670258A (en) * | 2018-07-23 | 2018-10-19 | 张新举 | A kind of sole shape collector |
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| CN104647757A (en) * | 2015-01-26 | 2015-05-27 | 刘轶 | Manufacturing method for 3D (three-dimensional) printing shoe pad |
| CN104699908A (en) * | 2015-03-24 | 2015-06-10 | 唐力 | Manufacturing method for 3D orthopedic insole |
| CN104699908B (en) * | 2015-03-24 | 2017-12-12 | 唐力 | The preparation method of 3D orthopedic insoles |
| CN106263139A (en) * | 2015-05-13 | 2017-01-04 | 汉琦国际有限公司 | Topology foot cover and preparation method thereof |
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