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Prosthetic Pneumatic knee joint
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[Abstract]:
For patients with thigh prostheses, it has always been a problem to choose between pneumatic joints or hydraulic joints. Today I will talk about prosthetic pneumatic knee joints. Both hydraulic and pneumatic knee joints are passive prostheses, which use the thigh residual limb to drive the prosthetic leg to swing to achieve walking. The knee joint of the thigh prosthesis adjusts the damping torque of the knee joint according to the changes of external conditions to realize the gait adjustment. Because the control method is relatively simple, the realization difficulty is relatively small, and the energy consumption is relatively low, so it is widely used. The intelligent thigh prosthesis belongs to the active prosthesis, which mainly uses the motor as the power source, which can replace the leg muscles to provide torque and make the knee joint actively bend and extend. Knee joint prostheses can be divided into single-axis prostheses and multi-link prostheses according to their structure. The single-axis knee joint has only a single axis of rotation, and it has high flexibility during the swing phase, but it is not stable enough during the support phase. Most of the multi-axis knee joints are multi-link knee joints (four-link, five-link or six-link). The design of the multi-link mechanism allows the center of rotation to move in a certain trajectory, which is more in line with the rotation of the knee joint when the human body is walking normally When the center changes, the instantaneous center of rotation can be much higher than the axis of rotation when it is stretched, and it quickly drops to the vicinity of the axis of rotation when it is bent, so that it can stretch flexibly, while maintaining stability during the support period. The single-axis pneumatic knee joint is suitable for patients with long residual limbs. The joint body is more flexible, but the disadvantage is that it is not easy to control. The four-link pneumatic knee joint has more suitable residual limb types and is characterized by relatively stable. Pneumatic knee joint: high flexibility, low movement damping, low force requirement, gentle swing, low temperature requirement (basically not affected by temperature), light weight of gas. Disadvantages: Because the compression rate of air is slightly higher (in place), the accuracy is slightly worse than that of hydraulic pressure (but people's weight is generally within 150 kg, so the compression rate is very small, so it has little effect).
At present, multi-axis pneumatic knee joints are more popular with prosthetic patients. Compared with single-axis pneumatic joints, multi-axis joints are safer, more stable in practical performance, and have a more beautiful walking gait.
The prosthetic pneumatic knee joints are cost-effective and can meet the walking requirements of most patients with thigh prostheses, and are suitable for a wide range of residual limb types.
SHIJIAZHUANG AOSUO O&P
Prosthetic Pneumatic knee joint
For patients with thigh prostheses, it has always been a problem to choose between pneumatic joints or hydraulic joints. Today I will talk about prosthetic pneumatic knee joints. Both hydraulic and pneumatic knee joints are passive prostheses, which use the thigh residual limb to drive the prosthetic leg to swing to achieve walking. The knee joint of the thigh prosthesis adjusts the damping torque of the knee joint according to the changes of external conditions to realize the gait adjustment. Because the control method is relatively simple, the realization difficulty is relatively small, and the energy consumption is relatively low, so it is widely used. The intelligent thigh prosthesis belongs to the active prosthesis, which mainly uses the motor as the power source, which can replace the leg muscles to provide torque and make the knee joint actively bend and extend. Knee joint prostheses can be divided into single-axis prostheses and multi-link prostheses according to their structure. The single-axis knee joint has only a single axis of rotation, and it has high flexibility during the swing phase, but it is not stable enough during the support phase. Most of the multi-axis knee joints are multi-link knee joints (four-link, five-link or six-link). The design of the multi-link mechanism allows the center of rotation to move in a certain trajectory, which is more in line with the rotation of the knee joint when the human body is walking normally When the center changes, the instantaneous center of rotation can be much higher than the axis of rotation when it is stretched, and it quickly drops to the vicinity of the axis of rotation when it is bent, so that it can stretch flexibly, while maintaining stability during the support period. The single-axis pneumatic knee joint is suitable for patients with long residual limbs. The joint body is more flexible, but the disadvantage is that it is not easy to control. The four-link pneumatic knee joint has more suitable residual limb types and is characterized by relatively stable. Pneumatic knee joint: high flexibility, low movement damping, low force requirement, gentle swing, low temperature requirement (basically not affected by temperature), light weight of gas. Disadvantages: Because the compression rate of air is slightly higher (in place), the accuracy is slightly worse than that of hydraulic pressure (but people's weight is generally within 150 kg, so the compression rate is very small, so it has little effect).
At present, multi-axis pneumatic knee joints are more popular with prosthetic patients. Compared with single-axis pneumatic joints, multi-axis joints are safer, more stable in practical performance, and have a more beautiful walking gait.
The prosthetic pneumatic knee joints are cost-effective and can meet the walking requirements of most patients with thigh prostheses, and are suitable for a wide range of residual limb types.