1. Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

2. Project Objectives  Design or modify an existing design of an upper limb prosthetic for a boy with upper limb deformities  Create an upper limb prosthesis

3. Existing Device  Drawbacks: Taking prosthesis on and off takes considerable amount of time and effort  Prosthesis is a very old design that does not work  Redesign existing prosthesis to make it more functional for an active 8-year-old boy

4. Goals for New Device  Short-term Goals Dress independently Go to the bathroom on his own  Long-term Goals Be able to live independently  i.e. – drive a car, cook for himself, use standard household items, etc.

5. Original Ideas for Device  Humeral cuff with Velcro closure  Stump sock interface over humerus  External elbow hinges  Myobock hand with myoelectric interface  Figure 9 suspension system

6. Work Completed  Met with Aaron to discuss the next step. He showed us how to make a cast so we can make one of Matthew’s arm.  Made a cast of Matthew’s arm, which will be used to make a mold of Matthew’s arm in order to test prosthetic designs.  Test socket made  Met with Matthew and his mother to fit test socket and discuss how they felt about it.

7. Work Completed  Met with Aaron, Matthew, and his mother and father to assess how well the test socket fit and to test for myoelectric activity in Matthew’s arm.  Matthew was found to have myoelectric activity and was able to open and close MyoBock hand.

8. Work Completed  Met with Aaron, Matthew, and his family to fit second test socket, which was too big, so a third one is being made.  Gave Matthew and his parents software and electrodes to use at home in order to practice contracting muscles to control MyoBock hand.

9. MyoBoy Software  MyoBoy measures patient muscle potentials with the same electrodes used in the definitive prosthesis  Matthew was found to have independent control of his muscles

10. MyoBoy Software  MyoBoy's fun "racecar" training module helps to train the patient for their device before they are fitted.

11. Casting  Originally did a cast with flexible fiberglass material  Had to redo the cast with plaster

12. Matt’s Measurements  From the AC joint to the lateral epicondyl of the humerus: 21 cm  From the lateral epicondyl to the tip of the thumb: 19.5 cm (on left arm)  From base of metacarpal to the tip of the thumb: 5.5 cm (left hand) & 5 cm (right hand)

13. Test Sockets  Original plastic is Thermolyn Soft, manufactured by Otto Bock more flexible and easier to form onto very small mold shapes  Now using 3/16” thickness Vivak plastic, a high temperature PETG plastic to use a plastic which had zero creep

14. Current Work  4 th socket device with electrodes  Sleeve to keep socket in place and prevent air from escaping socket  Vacuum seal

15. Concerns about socket  Sleeve is tight  Pressure from electrodes hurts  Restrict circulation?  Vacuum seal himself?  Ability to get on and off himself

16. Future Work: Myoelectric Hand  Ottobock Electrohand 2000 4.8 V DMC (Dynamic Mode Control)- speed of opening, closing and grip force determined by the level of muscle signal  Grip Force=55 N Wt=130 g (4.586 oz) More closely mimics natural hand Technical DataSize 6 ½ Operating Voltage4.8 V Average current consumption 200 mA Electronic switch-off “Close” 400 mA Electronic switch-off “Open” 250 mA Opening width56 mm Grip force55 N Weight130 g (4.586 ounces)

17. Future Work: Elbow Component  Ottobock 12K19 Body Powered Passive Elbow Lock 10 locking positions in 8 degree increments Can push a button to lock elbow or can connect button to a figure 9 harness

18. Future Work: On Our Way to a Finished Device  Assess how the socket is fitting and Matthew’s ability to control the electrodes  Obtain parts to complete device  Put device together, let Matthew use it and test it out for a period of time and then reassess

19. Future Work: After the Finished Device  May need to adjust gain  Myobock ErgoArm Electronic Plus