1 of 13

Preliminary Design Review

Group 12: Development of Cutting Edge Instrumentation for Vision Preserving Surgery

1

Hans Chen

Joanne Low

Quinn Mullineaux

Hanieh Seilsepour

2 of 13

Overview & Problem Definition

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

2

Vision Preserving Surgery

Image Sources:

[1] Xue, X., Zhou, C., Gao, Y., Ji, X., & Zhang, X. (2023, January 6). Optic nerve sheath fenestration for visual impairment in cerebral venous diseases. Frontiers. https://www.frontiersin.org/articles/10.3389/fneur.2023.1065315/full

​

Procedure - Optic Nerve Sheath Fenestration

Figure 1 : Step- by Step illustration of optic nerve sheath fenestration

Presenter: Hanieh

Team 12

3-4X

incision

Eye

3 of 13

Two Part Tool Design

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

3

Handle

​

Presenter: Quinn

Team 12

  • .22” Stainless steel tubing
  • Notched to accommodate snap-fit head
  • Compatible with plastic head (shown far right)

​

Head

(Scaled Up)

​

4 of 13

Static Tool Design

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

4

Presenter: Joanne

Team 12

Sponsor’s Concerns with Two Part Design

  • Potential hassle with 2 pieces before operation
  • Ease of sterilization
  • Durability
  • Same geometry
  • No snap mechanism
  • 316L SS

5 of 13

Component 1: Head

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

5

Presenter: Hans

Team 12

Groove to isolate optic nerve

Curvature to match curvature of eyeball

Wider extensions to keep fat away

6 of 13

Component 3: Snap Lock Mechanism

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

6

Presenter: Hanieh

Team 12

7 of 13

Component 2: Fiber Optic Light Source

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

7

Presenter: Hans

Team 12

  • Light Source Component (Removable)
    • CR2032 Battery & Holder
    • Casing to clamp onto handle
    • LED
  • Fiber Optic Component (Reusable)
    • Runs from base of handle to bottom of head
    • Steam sterilizable

8 of 13

High Priority Tasks

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

8

Presenter: Quinn

Team 12

Item

Priority

Person

Completion Date

Order 316L 3D Print

High

Joanne

Week 8

Fiber Optic Housing

High

Hans

Week 9

Stress Test Tools

Medium

Quinn

Week 9

Design Mold For Snap-Fit Head

High

Hanieh & Quinn

Week 9

9 of 13

Second Priority Tasks

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

9

Presenter: Hanieh

Team 12

Instrument Processing

​

​

  • Cleaning
  • Inspection
  • Packaging

​

  • Sterilization
    • CDC: Centers for Disease Control and Prevention
  • Storage and Delivery
  • Quality Assurance

10 of 13

Gantt Chart

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

10

Presenter: Joanne

Team 12

11 of 13

Plan for Testing

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

11

Presenter: Hans

Team 12

Functionality Test (Cadaver)

Static Load Test for Snap-fit Component

Steam Sterilization Test

12 of 13

Remaining Questions and Unresolved Issues

JACOBS SCHOOL OF ENGINEERING | Mechanical and Aerospace Engineering

12

Materials Choices

Presenter: Quinn

Team 12

Biocompatible SLA Resins

For the Static Design & Snap-in Head:

13 of 13

Acknowledgements

UC San Diego Health - Shiley Eye Institute

Dr. Bobby Korn

Eman Al-Sharif

​

Department of Mechanical and Aerospace Engineering, UC San Diego Prof. Jerry Tustaniwskyj

Prof. Nicholas Gravish

Prof. David Gillett

​