How Intelligent Robotic Thigh Prosthesis Is

Medi-Rehatek robotic thigh prosthesis takes 0.05 seconds to see the outline of the object when the object suddenly appears in front of human eyes. 

And knee angle sensor and ankle torque sensor are the sensory system of intelligent bionic prosthetic knee joint. The sensors collect walk information for 50 times per second and guard the walk. It has the equivalentas every 0.02 seconds to collect a message. 

In the current research and development,the best micro-processor chip can even collect foot movement sampling for 1000 times per second. This will ensure that the intelligent thigh prosthesis is only able to cover a wide range from slow to very fast pace. 

Some amputees using intelligent prosthetic limbs can achieve about 120m / min that is so close to running speed.

Adaptive intelligent bionic prosthesis can detect different speeds of the amputees in time such as walking, going downhill, going down the stairs, stumbling and other different walking way and state. 

The intelligent bionic prosthesis can offerappropriate control and support according to the above condition. It allows the intelligent prosthesis to follow and imitate the healthy limb movement, so that amputees can walk and stand like a normal person. 

The adaptive intelligent bionic prosthesis not only has identification speed and nature gait, but also automatically identifies the condition like sitting, standing, flat road , slopes, stairs, stumbling andso on, which can provide the appropriate support to ensure safety. 

The new force sensor detects the load condition of the knee,the speed sensor detects the swayspeed.Two sensors co-operate to determine the different walking state and mode of the amputee. In addition to improving the gait,the intelligent bionic prosthesis can automatically adapt to condition changes in order to improve the activities capacity of amputees and reduce energy consumption. 

Relative blog: Simple classification of below-knee prosthesis I

Advantage of thigh prosthesis socket with ischial containment

Scientific research found that the vast majority of patients wearing thighprosthesis with ischial containment socket stand up, the stump of the femur always moves outwardly. Biomechanical Theory and prosthesis assembly experience show that the femur adduction in the prosthetic socket,that has a very important significance for amputees while walking to reduce energy consumption. 

Therefore, the design of new socket makes sure the adduction of the femur. It is also found that the ischial support point of rotation doesn’t coincide with hip rotation point in thigh prosthesis with ischial containment socket; the stump occupies a lot of space inside and outside of socket, most are muscles and soft tissues. 

So the socket will move outwards and inwards under thehorizontal force, the new socket has to avoid this happening. Based on the two cases, it is designed to have a longitudinal ellipse socket has large width in the longitudinal direction and little width in the horizontal direction.

It not only has support from the ischial plane, but also contains and supports it the ischial in the side.

To better understand the longitudinal ellipse Medi-Rehatek socket,we summarize its main advantages as follows:

(1)A longitudinal ellipse socket contains the ischial bone around the inside and rear side,the stump can avoid moving inside and outside.

(2) There is no obvious ischial support plane in socket,that avoids thefull load on ischial tuberosity.

(3) There will be no pressure on blood vessels and nerves of femoral triangle.

(4) It is more in line with the requirements of biomechanics, alleviatesthe squeeze extent of residual limb, reduces the stump to shrink.

(5) The stumps is full contact with the socket.It reduces the pressure onunit area of the residual limb.

(6) Soft tissue is more in line with the hydrostatic law.

(7) It has obviously external devices and the femur can have adduction.

(8) The prosthetic socket can be flexible, it can also be rigid, but theportion bears load that must be relatively strong. 

Relative blog:The cause of stump end swelling when wearing thigh prosthesis

Thigh prosthesis socket with ischial containment I

Simple analysis of characteristics of thigh prosthesis socket with

ischial containment I

Ischial containment socket has many advantages compared to the original quadrilateral socket.Medi-Rehatek prosthetic socket has a relatively wide range of use, but it requires a very high technology to clinical assembly.It is proven to be the best prosthetic socket technology in modern world from a large number of practical assemblies. 

Ischial containment socket not only changes the feature from horizontal ellipse to longitudinal ellipse but also is conformed to the innovative technologyof human anatomy. More importantly, its load-bearing and suspension undergoes a qualitative change compared to the prosthetic socket with longitudinal quadrilateral ellipse. The load-bearing principle of prosthetic socket with longitudinal quadrilateral ellipse is to put pressure on socket in order to ensure the ischial bone play a major role on bearing load on socket.

The squeezing thigh muscles and its deformation have partial load-bearing and play a major role on suspension. But its biggest drawback is to change the original loading capacity line of human thigh,it will produce instability when standing and walking. 

The load-bearing principle of ischial containment socket is that prolonged cross force point between the lower end of greater trochanter and rami ischii,which play a major role on bearing load.For this point, the patient put on prosthesis and will continue to use the original loading capacity line ofhuman thigh when standing and walking. It will eliminate the instability.The external force of rami ischii combines with the internal pressure of upper end of greater trochanter and the internal pressure of lower end of femur  ,it will produce bony suspension. ( The greater trochanter can not be pressurized).

Ischial containment socket evolves from a comprehensive variety ofmouth features of thigh prostheses. It is called longitudinal ellipse as its characteristics of oval-shaped mouth. People have the two basic thinking of horizontal ellipse socket through research on the ischial containment socket.

First, how to ensure that the fermur adduction in the prosthetic socket.

Second, how to avoid inside and outside movement of stump in the prosthetic socket. 

Relative blog:Classification of scoliosis