Microprocessor Controlled Knees – AK Prosthetics – The C-Leg

Microprocessor Controlled Knees – AK Prosthetics – The C-Leg

By Daniel Rinella

Do you want to learn more about above knee prostheses?

Do you wish you could know what you are talking about when it comes to prosthetic legs?

Why Microprocessor-Controlled Knees Are Significant

1.) Introduction

Microprocessor-controlled prosthetic knees (MPK) have now set a new standard for stability and ease of use for transfemoral amputees. These microprocessor knees function by using multiple sensors that are located within the body of the body of the prosthesis. These sensors, in turn, provide data to an on-board microprocessor so it can know where the joint is within the individual’s gait cycle.

2.) How C-Leg Technology Works For Amputees

Both the C-Leg and Compact have knee joints that are controlled by microprocessors. They are controlled by the feedback that comes from sensors, which are unique software in the microprocessor and a hydraulic system that also creates resistance. The sensory data that is provided comes from two sensors:

A.) The Knee Angle Sensor: This an important sensor because it measures two things. The knee flexion angle and also the angular speed of the joint. This sensor is responsible for supplying the microprocessor with necessary information which can dynamically control of heel rise during the swing phase as well as stability during stance phase.

B.) A Moment Sensor: There is a moment sensor that is located in the tube adapter of the prosthesis. It serves to measure the ankle moment from heel-strike to an individual’s toe off. It also lets the microprocessor know just where the user is in their gait cycle.

3.) What Does This Information Mean In Basic Terms?

What is amazing is that the sensor data that is processed at a rate of 50 times per second, by the software that contains algorithms based on the walking habits of thousands of individuals! In this way, the software considers in what phase of gait an individual is in to determine the most appropriate resistance and setting for the individual that is using the leg.

4.) Proactive and Reactive

In the end, all of this adds up to mean that the C-Leg allows the individual who is using prosthesis to be more proactive instead of being reactive. A prosthetic system that is reactive in nature would only respond to a trip or stumble by receiving the sensory information after that prosthesis has encountered the ground, unfortunately. At this point it is obvious that it would be too late to avoid the fall.

The C-Leg is proactive in the sense that it anticipates what demands are about to be placed on the patient and prosthetic system. Therefore it prepares itself accordingly. If anything causes the user to stumble then the system is already offering flexion resistance and in this way it will help to prevent a fall for the amputee.

This is health information. For medical advice on prosthetic limbs then it is important to consult your local, licensed prosthetist for your particular needs.

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