Thigh Series
The species of knees are as many as several dozens, meet the needs of different economic levels of people
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The installation of the lower leg prosthesis provides the maximum recovery of the function of the lower leg.
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Prosthetics are a comprehensive concept that needs to be discussed in parts.
Upper limb prosthesis:
Upper limb prosthesis, can active action, is the upper limb electromyography prosthesis.
The control system is composed of two parts: EMG sensor and control circuit.
Electromyographic signal (EMG): Surface EMG is superimposed on the skin surface by the sequence of action potentials generated by the motion units collected by the muscles when excited. It is a kind of non-stationary weak signal.
After obtaining the EMG signal through the sensor, it is processed by the control circuit, and the control circuit controls the action system to make various actions. At this stage, it is mainly to open and close the tiger mouth.
Control circuit part, the main burden of two aspects.
First, determine intent.
The EMG signal is unstable, sometimes the antagonist muscle will send out a high signal at the same time, sometimes the signal is not sustainable, and sometimes it will be interfered by the electromagnetic environment, etc., which need to be judged and adjusted by the control circuit.
Second, determine the action.
Modern EMG prostheses have more and more functions. With certain EMG signals, it is sometimes necessary to control the circuit to judge the type, duration, speed and strength of the movement.
PS: At the present stage, most of the upper limb prostheses put into clinical use are EMG prostheses, while voice control and brainwave are not practical so far.
Mechanical switch (pull wire switch, touch switch) instead of EMG sensor products, but rare, mainly used in the case of unable to obtain EMG signal.
At the same time, there are currently no EMG prostheses that can provide tactile feedback. 
"Lower limb prostheses:
Lower limb prosthetics need to be controlled, mainly artificial knee, thigh amputation patients, hip amputation patients need to use.
There are five main control approaches for artificial knee joint:
1. Manual control.
Rarely, it is generally used in patients with poor control ability. The form is manual lock to control whether the knee joint can be flexed.
2. Mechanical friction control.
Common in low-end products.
Knee joint swing is controlled by mechanical friction.
3. Air pressure control.
The knee joint swing is controlled by damping of pneumatic cylinder.
4. Hydraulic control.
The swing of knee joint is controlled by damping of hydraulic cylinder.
Note the unusual simultaneous air pressure and hydraulic pressure on the artificial knee joint.
5. Electromagnetic control.
Magneto-rheological materials were used to control the knee swing.
Note that the control of the intelligent prosthesis also uses the above five control approaches, such as the YOBAND 3K185, which uses hydraulic control approaches."
Control mode:
At present, the control mode of most knee joints is preset and adjustable, such as air pressure and hydraulic knee joints, through adjusting the valve to control the posture of flexion and extension during the prosthetic swing period.
Or support period control.
Intelligent knee joint, using sensors, MCU control walking posture.
Commonly used sensors are Angle sensors, pressure sensors, acceleration sensors.
Other controls have been tried, but are not currently in clinical use.
USA YOBAND prosthetic innovation technology is shared, focusing on financial and material resources, focusing on and producing its own research and development, giving full play to its unique core competitive advantages, and fully integrating global resources with international peers for the benefit of disabled friends! So when selecting a prosthetic company, the amputee who installs prosthetic limbs must investigate on the spot to determine whether the prosthetic company really has a technical team to make a prosthetic receptor cavity. The qualified prosthetic receptor cavity plays a key role in their own comfortable experience and prosthetic walking gait.
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