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

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

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

Upper Limb Prosthetic Adaptation/Redesign

Group 6Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams

Advisor: Dr. Mark Richter Aaron Fitzsimmons

Page 2: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 3: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 4: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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.

Page 5: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

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

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.

Page 7: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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.  

Page 8: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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.

Page 9: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 10: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

MyoBoy Software

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

Page 11: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

Casting

Originally did a cast with flexible fiberglass material

Had to redo the cast with plaster

Page 12: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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)

Page 13: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 14: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

Current Work

4th socket device with electrodes Sleeve to keep socket in place and

prevent air from escaping socket Vacuum seal

Page 15: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

Concerns about socket

Sleeve is tight Pressure from

electrodes hurts Restrict circulation? Vacuum seal

himself? Ability to get on and

off himself

Page 16: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 17: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 18: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

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

Page 19: Upper Limb Prosthetic Adaptation/Redesign Group 6 Cassie Edwards, Meg Stevenson, Amy Thomas, Meagan Williams Advisor: Dr. Mark Richter Aaron Fitzsimmons

Future Work: After the Finished Device

May need to adjust gain Myobock ErgoArm Electronic Plus