Above Knee Amputation• What is AKA ?• Due to what ?• What are the Solutions ? ....... AKAs in Sri Lankan.
Available Products and Facilities for AKAs in Sri Lanka• Jaipur Knee• WalkRite Limited• A J Medichem Major Prosthesis Importers• International Health Care• Dept. of prosthetic leg manufacturing, Ranaviru Sewana, Ragama• July 7th to 23rd 2009 – Sri Lanka’s first mobile artificial limb clinic
Project Outline Prototype Develop Design the Control Capture System Gait Data
Objectives• Study the previous project.• Less power consuming and a light weight design.• Reduce the electronic sensor requirement.• Develop the communication between two legs in real time.• Design and fabricate the bionic leg.
Methodology•Study the previous Stage 02 •Apply the new Stage 04 •Install the project mimic mechanism prototype to an •Computer aided •Develop a prototype•Conduct a •Conduct a existing prosthetic design of the knee •Check whether it can literature survey simulation test leg in the market •Selection of an acquire the required actuation motion real time Stage 01 mechanism Stage 03 Stage 05
SECTION - 02• Experimental Setup – Motion capture for gait analysis via MATLAB – Use of a mechanical sensors to measure the knee joint angle – MATLAB Simulink walking model• Results analysis
Motion Capture to Gait Analysis• Video recording – Shutter speed- 1/25 s – Aperture- f/4 – Frame rate- 24• Upload to the Mat lab workspace
• Select the region where points hanging• Segment the points• Find the center of the segmented points – SE = strel(disk, N) – Threshold (0-1)
Use of QE to measure knee angle• Encoder - HP HEDS 5500 C11• CPR (counts per revolution) – 100• Data acquisition software - C#.NET
Results• Knee angle during level ground walking -
SECTION - 03• Control System• Prototype Design• Specifications• Further Improvements
Relationship between heel strike and toe strike of the real andprosthetic leg -• PLH = 1 - Prosthetic Leg Heel is on the ground• PLT = 1 - Prosthetic Leg Toe is on the ground• RLH = 1 - Real Leg Heel is on the ground• RLT = 1 - Real Leg Toe is on the ground