CN108703756A - A plantar pressure testing system - Google Patents

Abstract

The invention discloses a plantar pressure testing system, which comprises an insole; a flexible pressure sensing array fixed on the upper surface of the patient's insole; a data acquisition module for receiving plantar contact force information transmitted from the flexible pressure sensing array ; The wireless communication module is connected with the data acquisition module for externally transmitting the information of the plantar contact force; the mobile terminal is connected with the wireless communication module for receiving the information of the plantar contact force transmitted by the wireless communication module; the server is connected with the mobile phone The terminal communication connection is used to store the plantar contact force information sent by the mobile phone terminal; the computer is connected to the server by communication, and is used to retrieve and process the plantar contact force information; Neuropathy and even pressure ulcers can realize real-time observation and inspection of plantar pressure, so as to achieve the effect of early prevention or prevention of deterioration of foot problems.

Description

A plantar pressure testing system

technical field

The invention relates to a plantar pressure testing system, which belongs to the technical field of intelligent detection and control.

Background technique

The movement of the human body is carried out in the form of a kinematic chain, and the foot is the original force point of the human kinematic chain, so the functional information of the lower limbs and even the whole body can be displayed from the plantar pressure and gait. Due to the important mechanical function of the foot in sports, people have been measuring and analyzing mechanical information such as plantar pressure and gait for a long time. Plantar pressure is the ground reaction force on the sole of the foot in the vertical direction under the action of its own gravity when the human body is standing still or walking dynamically; gait refers to the posture or mode of foot movement, and the tactile information characteristics of gait Affected by the innate human foot shape and acquired environmental habits, etc., it reflects the characteristics and information of human physiology, structure and function. Detecting plantar pressure is an important part of gait analysis and is the basis for analyzing and measuring abnormal plantar stress distribution and gait. With the continuous complexity of the working environment and the advancement of pressure sensor technology, the sensing principle of the flexible force sensor in the current mainstream plantar pressure distribution measurement system is based on piezoelectricity, piezoresistance and capacitance, etc., and its principles are all based on measuring pressure. The corresponding physical effects are generated, and then the pressure on the sole of the foot is indirectly measured using the model relationship between the force and the corresponding physical effects.

Diabetic patients will suffer from excessive mechanical pressure due to peripheral neuropathy and peripheral vascular disease, which can cause damage and deformity of the soft tissue and bone joint system of the foot, and then lead to a series of foot problems. From mild neurological symptoms to severe ulcers, infections, vascular disease and neuropathic fractures. As a result, diabetic patients not only have increased plantar pressure, but also have uneven distribution of plantar pressure. Through real-time observation of the plantar pressure distribution data during daily walking, the patient's foot force and gait information can be analyzed, which part is affected Preliminary judgment of neuropathic foot problems can reduce the incidence of foot ulcers in diabetic patients or shorten the rehabilitation cycle, which is of great significance for the early prevention and treatment of foot problems. There is currently no device for real-time testing of plantar pressure for all-day walking in diabetic patients.

Contents of the invention

The technical problem to be solved by the present invention is to provide a plantar pressure testing system to solve the current problem of peripheral neuropathy and even pressure ulcers caused by diabetes, and to realize real-time observation and inspection of plantar pressure , so as to achieve the effect of preventing or preventing the deterioration of foot problems in advance.

The technical solution of the present invention is: a kind of plantar pressure testing system, comprises insole, also comprises:

A flexible pressure sensing array, fixed on the upper surface of the patient's insole, used to obtain plantar contact force information during walking;

The data acquisition module is connected with the flexible pressure sensing array, and is used to receive the plantar contact force information transmitted from the flexible pressure sensing array;

The wireless communication module is connected with the data acquisition module, and is used for externally transmitting the contact force information of the sole of the foot;

The mobile phone terminal is connected with the wireless communication module, and is used to receive the plantar contact force information transmitted by the wireless communication module;

The server is communicated with the mobile terminal and is used to store the plantar contact force information sent by the mobile terminal;

The computer communicates with the server, and is used for retrieving and processing the plantar contact force information.

The plantar contact force information includes the thumb area, the second toe area, the third-fifth toe area, the first middle bone area, the second third middle bone area, the fourth middle bone area, the lateral area of the arch of the foot, and the calcaneus area. Contact force information for the medial region, the medial region of the calcaneus, and the lateral region of the calcaneus.

The flexible pressure sensing array includes an upper flexible film layer, an upper electrode layer, a conductive rubber array force-sensitive layer, an insulating layer, a lower electrode layer and a lower flexible film layer that overlap sequentially from top to bottom, wherein the upper electrode layer is provided with There are electrodes connected to the upper surface of the force-sensitive layer of the conductive rubber array, electrodes connected to the lower surface of the force-sensitive layer of the conductive rubber array are arranged on the lower electrode layer, the electrodes of the upper electrode layer and the electrodes of the lower electrode layer are perpendicular to each other, the conductive rubber array The force-sensitive layer includes the thumb area, the second toe area, the third-fifth toe area, the first middle bone area, the second third middle bone area, the fourth middle bone area, the outer arch area, and the inner side of the calcaneus The pressure-sensitive units of the region, the middle region of the calcaneus, and the lateral region of the calcaneus, each pressure-sensitive unit is fixed in the middle of the electrode intersection of the upper electrode layer and the lower electrode layer.

An upper ink layer is arranged outside the upper flexible film layer, and a lower ink layer is arranged outside the lower flexible film layer.

The upper flexible film layer and the lower flexible film layer are PET polyester films.

The data acquisition module is placed in the card slot under the insole of the shoe.

The beneficial effects of the present invention are: compared with the existing test device, the flexible pressure sensor array in the present invention is designed for diabetic patients. Clinically, calluses and pressure ulcers mostly occur on the forefoot, so that in addition to the actual pressure of the human foot The plantar pressure sensor is designed by distribution, and the density of the sensitive unit is increased in the forefoot part; since the sensor array is placed on the insole of the shoe, considering the long-term walking temperature and humidity environment in the shoe and the presence of foreign objects in the gait interaction High-temperature and high-humidity friction-type functional ink is attached to the outer layer of the sensor array, so as to avoid the problem of sensitivity change of piezoresistive sensors after repeated use as much as possible.

In addition, the present invention adopts wireless communication, the plantar pressure data is transmitted to the mobile terminal of the user's mobile phone in real time, the mobile terminal sorts and collects and uploads to the server, and the data collected by the server is stored in the cloud, which facilitates data aggregation and efficient data reading. The computer is used as the upper computer, and the software is used to read the server cloud data and analyze the data. For example, the doctor checks the test results and finds that the patient's foot is at risk of ulcers, and can use the pressure data to customize an exclusive mold-type insole for prevention or postoperative treatment.

Therefore, the present invention has the characteristics of high density, high flexibility, high humidity and heat resistance, improves the reliability and portability of the plantar pressure test, and solves the problem that the sensitivity of the sensitive unit decreases in the long-term test, and the test data when used outdoors Real-time transmission analysis and other issues.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a schematic diagram of the layered structure of the flexible pressure sensing array in the present invention;

Figure 3 is a diagram of the plantar force area;

Fig. 4 is a schematic diagram of the sensing area of the flexible pressure sensing array in the present invention;

Fig. 5 is the structural representation of data acquisition module in the present invention;

Fig. 6 is a schematic diagram of hardware connection in the present invention;

In the figure: 1-upper ink layer, 2-upper flexible film layer, 3-upper electrode layer, 4-conductive rubber array force sensitive layer, 5-insulation layer, 6-lower electrode layer, 7-lower flexible film layer, 8 -Lower ink layer, 9-toe, 10-arch, 11-middle bone, 12-calcaneus, 13-thumb area, 14-second toe area, 15-third-fifth toe area, 16-thumb One middle bone area, 17-second and third middle bone area, 18-fourth middle bone area, 19-outer arch area, 20-calcaneal inner area, 21-calcaneal middle area, 22-calcaneal outer area, 23-insole, 24-hardware circuit module.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the invention is further introduced:

Please refer to Fig. 1 to Fig. 6, a plantar pressure testing system according to the present invention includes an insole 23, a flexible pressure sensing array, a data acquisition module, a wireless communication module, a mobile phone terminal, a server and a computer. Wherein, the flexible pressure sensing array is installed on the upper surface of the patient's insole 23, fixed by pasting, and is used to obtain plantar contact force information of different parts in the walking process; the data acquisition module is connected with the flexible pressure sensing array, It is placed in the card slot under the insole 23 in the shoe to receive and adjust the plantar contact force information transmitted from the flexible pressure sensor array; the wireless communication module is connected with the data acquisition module for external transmission of the plantar contact force information; the mobile terminal is connected with the wireless communication module to receive the plantar contact force information transmitted by the wireless communication module; the server communicates with the mobile terminal to store the plantar contact force information sent by the mobile terminal; the computer communicates with the server Connection, used to retrieve and process plantar contact force information, analyze and process, visualize the results, identify the distribution of pressure and gait movements, etc.

Please refer to Figure 3. According to the stress of different areas of the sole, the sole of the foot can be divided into four major areas, 9 toes, 10 arches, 11 middle bones, and 12 calcaneus. Ulcers mostly occur on the forefoot. On this basis, it is divided into ten areas, the thumb area 13, the second toe area 14, the third-fifth toe area 15, the first middle bone area 16, and the second and third middle bone areas 17. The fourth middle bone area 18, the lateral area of the arch of the foot 19, the inner area of the calcaneus 20, the middle area of the calcaneus 21, and the outer area 22 of the calcaneus.

The flexible pressure sensor array is based on the above ten areas, the sensing area layout of the sensor array design is shown in Figure 4, the sensor array is fixed above the insole 23 inside the shoe, so that the relative position between the foot and the pressure sensor is fixed, so it can be Get more accurate and reliable results. Specifically, the flexible pressure sensing array includes an upper flexible film layer 2, an upper electrode layer 3, a conductive rubber array force-sensitive layer 4, an insulating layer 5, a lower electrode layer 6 and a lower flexible film layer 7, which are sequentially overlapped from top to bottom, Wherein, the upper electrode layer 3 is provided with an electrode connected to the upper surface of the conductive rubber array force-sensitive layer 4, and the lower electrode layer 6 is provided with an electrode connected to the lower surface of the conductive rubber array force-sensitive layer 4, and the electrode of the upper electrode layer 3 is connected to the The electrodes of the lower electrode layer 6 are perpendicular to each other, and the electrodes adopt silver wires. The conductive rubber array force-sensitive layer 4 is a plurality of independent thin square conductive rubbers, which include respectively arranged in the thumb area 13, the second toe area 14, the third - Fifth toe area 15, first midbone area 16, second third midbone area 17, fourth midbone area 18, lateral arch area 19, medial calcaneus area 20, medial calcaneus area 21 and lateral calcaneus area 22 pressure sensitive units, each pressure sensitive unit is fixed in the middle of the electrode intersection of the upper electrode layer 3 and the lower electrode layer 6 .

In order to avoid the problem that the sensitivity of the piezoresistive sensor changes after repeated use, the upper flexible film layer 2 is coated with an upper ink layer 1, and the lower flexible film layer 7 is coated with a lower ink layer 8. The ink is preferably resistant to high temperature and high humidity. Rub resistant ink. The upper flexible film layer 2 and the lower flexible film layer 7 are PET polyester films, which serve as substrates for packaging.

During walking, the patient generates contact stress on the conductive rubber on the upper and lower layers of the sensor array. Each conductive rubber can be regarded as a variable resistor, and the resistance changes due to different pressures, thereby generating different voltages. value. The piezoresistive characteristic relationship of conductive rubber can be converted into the corresponding pressure value. The pressure value converted from the sampling data and the position of each signal can be accurately restored to the plantar pressure distribution and contour information on the sensor array surface.

To realize real-time data measurement of the sensor array, the hardware circuit module 24 of the data acquisition module is connected with the flexible pressure sensing array by using the FPC interface. As shown in Figure 6, the flexible electrodes are three rows and three columns covering the force-sensitive layer of the array. The number of pressure-sensitive units and the number of rows and columns of electrodes can be designed and changed according to the actual situation of the patient. The data acquisition module includes a data scanning circuit module, a data conditioning circuit module and a power supply module. The power supply module first provides the required stable voltage for the data scanning circuit, and an operational amplifier is first added to each row and column of the array, using the principle of "virtual short" , the potential of each row is pulled down to zero potential to eliminate the cross-coupling problem in the array resistance, and then the data analog switches are respectively connected, and the single-chip microcomputer outputs row selection and column selection signals to control the on-off of each digital analog switch to realize row and column scanning. The resistance of each sensing unit in the sensor is measured and read out one by one, and then the output voltage signal amplified by the operational amplifier is sent to the data conditioning unit for A/D conversion, and the analog voltage signal is quantized into a digital signal that can be processed by the computer to complete conditioning.

The data acquisition module uses C8051F380 single-chip microcomputer as the control core, HC4051 digital analog switch, MAX4495 operational amplifier, etc. to complete the scanning and conditioning of the sensor array, and obtain the pressure distribution data left by the patient at the current time in real time.

The wireless communication module transmits the data to the mobile terminal of the mobile phone, and the mobile terminal sorts and collects the data and uploads it to the server. Based on the TCP/IP client server mode, the computer can receive the data from the server, read and analyze the data with software, and judge the pressure distribution of the patient's foot . A large amount of patient information can be stored in the server, and the patient's doctor can also view the plantar pressure data of different patients through the server to achieve real-time diagnosis.

In one example, the wireless communication adopts Bluetooth transmission, and the transmission rate can reach up to 10KByte/S, which can provide guarantee for the transmission of pressure data.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (6)

1. A plantar pressure testing system, comprising an insole (23), characterized in that it also includes: The flexible pressure sensing array is fixed on the upper surface of the patient's insole (23), and is used to obtain information on plantar contact force during walking; The data acquisition module is connected with the flexible pressure sensing array, and is used to receive the plantar contact force information transmitted from the flexible pressure sensing array; The wireless communication module is connected with the data acquisition module, and is used for externally transmitting the contact force information of the sole of the foot; The mobile phone terminal is connected with the wireless communication module, and is used to receive the plantar contact force information transmitted by the wireless communication module; The server is communicated with the mobile terminal and is used to store the plantar contact force information sent by the mobile terminal; The computer communicates with the server, and is used for retrieving and processing the plantar contact force information. 2. The plantar pressure testing system according to claim 1, characterized in that: the plantar contact force information includes the thumb area (13), the second toe area (14), the third-fifth toe area (15 ), the first middle bone area (16), the second third middle bone area (17), the fourth middle bone area (18), the lateral arch area (19), the medial area of the calcaneus (20), and the middle area of the calcaneus (21) and contact force information for the lateral area of the calcaneus (22). 3. The plantar pressure testing system according to claim 1, characterized in that: the flexible pressure sensing array includes an upper flexible film layer (2), an upper electrode layer (3), a conductive Rubber array force-sensitive layer (4), insulating layer (5), lower electrode layer (6) and lower flexible film layer (7), wherein, the upper electrode layer (3) is provided with a force-sensitive layer connected to a conductive rubber array ( 4) For the electrodes on the upper surface, the lower electrode layer (6) is provided with electrodes connected to the lower surface of the conductive rubber array force-sensitive layer (4), and the electrodes of the upper electrode layer (3) and the electrodes of the lower electrode layer (6) are perpendicular to each other , the conductive rubber array force-sensitive layer (4) includes the thumb area (13), the second toe area (14), the third-fifth toe area (15), the first middle bone area (16), the second Pressure in the third medial area (17), fourth medial area (18), lateral arch area (19), medial area of the calcaneus (20), medial area of the calcaneus (21) and lateral area of the calcaneus (22) Sensitive units, each pressure sensitive unit is fixed in the middle of the electrode intersections of the upper electrode layer (3) and the lower electrode layer (6). 4. The plantar pressure testing system according to claim 3, characterized in that: an upper ink layer (1) is provided outside the upper flexible film layer (2), and a lower ink layer is provided outside the lower flexible film layer (7) (8). 5. The plantar pressure testing system according to claim 3, characterized in that: the upper flexible film layer (2) and the lower flexible film layer (7) are PET polyester films. 6. The plantar pressure testing system according to claim 1, characterized in that: the data acquisition module is placed in the slot under the insole (23) in the shoe.