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Control and harness sysrem for be and ae prosthetic management
- 1. BELOW KNEE PROSTHESIS & ABOVEKNEE PROSTHESIS MANAGEMENT TAPAS P. BEHERA PDUNIPPD, New Delhi
- 2. Below-elbow Harness andControl system The mechanism of single control system • one cable controlling the terminal device
- 3. Below-elbow Harness andControl system The mechanism of single control system • one cable controlling the terminal device
- 4. Cable Housing • Thecontrol cable passes through a continuous stainless steel housing or tunnel • The housing is fastened to the triceps pad by “cross bar assembly” • The housing is attached to the fore arm part by a base plate retainer Below-elbow Harness and Control system
- 5. • Cable Housing Below-elbowHarness and Control system
- 6. • Cable Housing Below-elbowHarness and Control system
- 7. Control Cable Below-elbow Harnessand Control system
- 8. The Function ofthe cable Housing • Less force to operate the TD • Less excursion of body motion to operate the TD • Prevent bridging between the cross bar assembly and forearm retainer • Less friction at the sharp bend of the cable Below-elbow Harness and Control system
- 9. The BE Harness •To provide for operation of the TD • To retain prosthesis securely in different operating positions Below-elbow Harness and Control system
- 10. The Figure of8 harness The Axilla loop (11a) The Ant. support strap (11b) The control attachment strap (11c) The “Ring” or “cross point” Below-elbow Harness and Control system
- 11. Body Control Motions •Shoulder Flexion Below-elbow Harness and Control system
- 12. Body Control Motions •Bilateral scapular abduction Below-elbow Harness and Control system
- 13. The operating sequence •The anatomical elbow joint is also to place the TD in the desired position of function • Shoulder flexion and scapular abduction operates the TD • Relaxing the shoulder allows the TD to return to starting position ( for VO, to be closed by rubber bands) Below-elbow Harness and Control system
- 14. The mechanism oftwo cable system (Dual control system) • One cable is used to both flex the prosthetic elbow joint and operate the TD • The second cable is used to luck and unlock the prosthetic elbow Above-elbow Harness and Control system
- 15. Dual control system Above-elbowHarness and Control system
- 16. Cable Housing • Splithousing Above-elbow Harness and Control system
- 17. The cable controlfor elbow flexion and TD Above-elbow Harness and Control system
- 18. The Elbow Lockcontrol cable • The lock works on an alternator principle • The sequence is “lock-Unlock-Lock-Unlock-….” • ¾ inch excursion and force of ~ 2 Lb are necessary to cycle the elbow unit Above-elbow Harness and Control system
- 19. The control system •Tension on the elbow flexion/TD first flexes the Prosthetic elbow • Pulling and releasing the elbow lock control strap locks the elbow • Tension on the elbow flexion /TD then causes the TD to operate Above-elbow Harness and Control system
- 20. Location of ElbowFlexion Attachment Above-elbow Harness and Control system
- 21. The conventional AEHarness (The figure of 8 Harness) The Axilla loop (a) The Ant. suspensor (b) Lateral suspensor © The control attachment strap (d) The “Ring” or “cross point” Above-elbow Harness and Control system
- 22. The Elbow LockControl Strap Above-elbow Harness and Control system
- 23. Body Control Motions •Shoulder flexion for prosthetic elbow flexion/TD operation • When the Elbow is locked, the TD can be operated Above-elbow Harness and Control system
- 24. Body Control Motions •Scapular abduction for additional cable excursion • Scapular abduction to operate the TD close to the body Above-elbow Harness and Control system
- 25. Elbow lock controlMotions • Complex shoulder motion involving 1. Downward rotation of scapula 2. Simultaneous abduction of shoulder joint 3. Simultaneous extension of shoulder joint Above-elbow Harness and Control system
- 26. The Operating Sequences The forearm is raised by shoulder flexion and/or scapular abduction The TD is operated by the shoulder flexion and or scapular abduction Above-elbow Harness and Control system