Artificial limb knee joint pressure detection system
By integrating inertial measurement unit and pressure sensor in the prosthetic knee joint and combining wavelet transformation processing data, a prosthetic knee pressure detection system is built, which solves the shortcomings of prosthetic knee pressure detection and improves the wearer's safety and testing accuracy.
Patent Information
- Application Number
- CN202311842034.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-07-01
AI Technical Summary
The existing prosthetic knee joints cannot effectively detect knee pressure, resulting in uncomfortable wear and improper use, and the test method is complex and error is large, which poses a risk of falling.
Inertial measurement unit and pressure sensor are used to collect knee joint information, combine wavelet transformation to process data, use the display module to prompt abnormal pressure, and the power module to manage voltage, and build a prosthetic knee joint pressure detection system.
It realizes effective detection of knee joint pressure, improves wearable comfort and safety, simplifies the testing process, and reduces errors.
Smart Images
Figure CN120227215A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of integrated biomedical engineering technology, and in particular to a prosthetic knee joint pressure detection system. Background Art
[0002] With the continuous development of prosthetic technology, the quality of life and social participation of prosthetic wearers are gradually improving. However, due to limitations in aspects such as the quality, function, and adaptability of prosthetics, prosthetic wearers still face many difficulties and challenges in daily life. Generally, the lower limb prosthetic knees produced and designed in China are purely mechanical, mainly passive lower limb prosthetic knees. Passive prosthetics cannot actively provide the required torque for the lower limb prosthetic knee, cannot perform complex movement processes, and at the same time bring excessive load and friction to the stump of the amputee, resulting in discomfort when wearing, walking not conforming to reality, being not dexterous in use, and being difficult to meet the needs of amputees. Currently, prosthetic manufacturers generally select amputee volunteers for wearing tests and conduct tests on various movements in the manufacturer's internal test site. This test method is relatively complex and time-consuming, and is not conducive to the testing of lower limb prosthetic knees. Due to the relatively complex control algorithm and structure of the knee joint, using the wearing method for testing is prone to errors, and the errors are relatively large, resulting in system errors and thus falling accidents, causing harm to amputee volunteers. Therefore, a safe knee joint pressure detection system has become an urgent technical problem to be solved. Summary of the Invention
[0003] In view of the above situation, the present invention proposes a prosthetic knee joint pressure detection system.
[0004] To achieve the above object, the present invention adopts the following technical solutions:
[0005] A prosthetic knee joint pressure detection system includes a data acquisition module, a data processing module, a display module, and a power supply module.
[0006] Compared with the prior art, the beneficial effects of the present invention are:
[0007] The present invention uses an inertial measurement unit and a pressure sensor to collect inertial information and pressure data at the knee joint of the wearer, so as to identify different motion states of the patient and abnormal pressure information of the socket on the knee joint in different motion states, and solves the technical problem that traditional lower limb prosthetics cannot effectively detect the knee joint pressure. Description of the Drawings
[0008] Figure 1 It is a block diagram of the system composition of the present invention. Detailed Embodiments
[0009] The present invention will be described below in conjunction with the drawings and specific embodiments.
[0010] The present invention discloses a pressure detection system for a prosthetic knee joint. The system includes a data acquisition module (1-1), a data processing module (1-2), a display module (1-3), and a power supply module (1-4).
[0011] The data acquisition module (1-1) includes an inertial measurement unit and a pressure sensor, which are installed on the inner wall of the prosthetic socket in a distributed manner. The inertial measurement unit acquires the inertial information of the wearer's knee joint, and the pressure sensor acquires the pressure data at the knee joint of the prosthetic socket, so as to identify the different motion states of the patient and the abnormal pressure information of the socket on the knee joint under different motion states.
[0012] The data processing module (1-2) performs denoising processing on the data acquired by the data acquisition module by using wavelet transform. Among them, the initial signal is decomposed by wavelet for 7 layers, the noise standard deviation is estimated from the high-frequency coefficients of the first layer, and the global threshold is selected by adjusting parameters during denoising, and the soft threshold is used to perform information denoising processing on the saved low-frequency signal. The initial signal is decomposed by wavelet, and the signal frequency components are concentrated below 20 Hz. To reduce the number of wavelet decomposition layers, the sampling rates of the velocity signal and the acceleration signal are reduced from 640 Hz to 80 Hz by sampling. The db5 wavelet basis function is used to decompose the acceleration signals in the vertical direction and the forward direction after downsampling by 7 layers respectively, and the time-frequency features related to motion are extracted.
[0013] The display module (1-3) displays the data output by the data processing module (1-2) on a computer monitor, and highlights the acquisition positions exceeding the pressure threshold.
[0014] The power supply module (1-4) is responsible for voltage conversion and outputs voltage to the data acquisition module (1-1), the data processing module (1-2), and the display module (1-3); at the same time, the power supply module (1-4) can also monitor the working voltage conditions of each module (1-5) and perform reasonable and effective power management.
[0015] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A prosthetic knee joint pressure detection system, characterized in that: The system includes a data acquisition module (1-1), a data processing module (1-2), a display module (1-3), and a power supply module (1-4).