Blinking Orbital Prosthesis

1
Blinking Orbital Prosthesis

• Hallie Kreitlow, Joel Gaston, Ryan Kimmel,
  Allison McArton

2
Outline

• Problem Statement
• Background
• Summary of PDS
• Designs and the Matrix
• Future Work
• Conclusion

3
Problem Statement

• Realistic blinking orbital prosthesis
• Same speed as functional eye
• Reasonable size and weight
• Non-harmful mechanism and materials
• Automated system

4
Background-Orbital Prosthesis

• Many causes of eye loss
• Prosthesis provide a realistic solution
• Currently, prostheses do not blink

5
Background-Problem Motivation

• Providing a more realistic prosthesis
• Syncing the blinking motion in both eyes
• Satisfying the patient
• Create interest in the field

6
Product Design Specification

• Function
• Client Requirements
• Design Requirements
• Physical and Operational Characteristics
• Production Characteristics
• Miscellaneous

7
Function

• Animated orbital prosthesis
• Currently few attempts
• Previously ran a wire from the contralateral eye
  muscle into orbital prosthesis
• Small enough to fit inside eye cavity and contain
  all parts

8
Requirements

• Client Requirements
• Impart life-like quality to a variety of
  materials
• Thin materials to save weight and space
• Synchronization could and should be considered
  later
• We are provided with an adequate budget
• Design Requirements
• It must be able to function for an entire day,
  but it doesnt need to be aesthetically pleasing

9
Physical and Operational Characteristics

• Performance Requirements
• Safety
• Accuracy, Reliability, and Life in Service
• Operating Environment
• Ergonomics, Size, and Weight
• Materials and aesthetics

10
Production Characteristics and Miscellaneous

• Quantity
• Target Product Cost
• Standards and Specifications
• Patient-related Concerns
• Competition

11
Possible Designs

• Actuator Movement
• Attracting Magnetic Field
• Repelling Magnetic Field
• Memory Metal Circuit

12
Actuator movement

• Cons
• Highly Invasive
• Power source must be located in cavity
• Components take up a lot of space
• Cannot be removed

• Pros
• Will work regardless of environment outside
  cavity
• Durable
• Fairly safe

13
Design-Common Aspects

• Air-core solenoid located in glasses frame

B-Field
i
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Repelling Magnetic Field

• Pros
• Non-invasive
• Power source located outside cavity
• Power only used when blink occurs

• Cons
• Large magnetic field/current required

Compression Spring
Eye Lid
B-Field
Permanent magnetic plate
Boundary of Cavity
15
Magnetic Field Designs-Alternate View

• Top View

Side View
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Attracting Magnetic Field

• Pros
• Non-invasive
• Power source located outside cavity

• Cons
• Large magnetic field/current required
• Constant power must be provided

Eye Lid
Tension Spring
B-Field
Permanent magnetic plate
Boundary of Cavity
17
Memory Metal Circuit

• Pros
• Space efficient

• Cons
• Power source located in cavity
• High current running through wire
• Extensive circuit engineering required

18
Design Matrix
19
Future Work

• Research on IR sensor
• Fabrication of needed parts
• Assembly of prototype
• Dealing with size issues
• Prototype testing
• Redesigning and subsequent testing

20
Conclusion

• Extensive research has been done on orbital
  prosthesis
• Developed several designs and chose the best
  design
• Work still needs to be done

21
Credits

• Professor Murphy
• Greg Gion
• Professor Bruch