156A Week 10

Individual Component Analysis Topics (revised and finalized)

• • Remote Control: Macy Castaneda

  • Materials and Integration: Dingyi Duan

  • Plates Design: Ashley Qu

  • Magnetic Mechanical Driver: Alec Schardein

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

Preliminary designs are completed. Risk reduction tests are currently under progress.

Accomplishments from Previous Week

Preliminary research has been completed. SolidWorks design drafts for (1) mechanical drive system and (2) plates have been completed (3 designs per component).

Goals for Next Week

• • Macy: Consult with NuVasive agent to better understand control behind technology.

  • Dingyi: Determine minimum force required to push skull apart with real data.

  • Ashley: Generate FEA on plate and screw designs.

  • Alec: Finalize design for mechanical drive mechanism.

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• • Suggestion: Consider SMA (shape-memory alloy) wire, “muscle wire,” which uses shape memory and requires no motor. This can be an alternative drive mechanism.

    • Action Taken: Research was completed and the idea was suggested to sponsor.

  • Suggestion: Acknowledge E&M radiation in report, but don’t pursue the topic too far.

    • Action Taken: Preliminary research completed. Changed individual component analysis to “Plates Design.”

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• • Suggestions:

    • Use the current FDA-approved NuVasive technology instead of SMA technology due to the criticality of the patient population and skull region.

    • Instead of simulating the minimum force required, attain quantitative measurements from real patients!

    • There is a metal 3D printer on campus. Use it to prototype your device.

  • Requirements:

    • The displacement mechanism must be able to move forward and backward.

      • Action: Redesign drive mechanism.

    • The devices needs more and smaller screws fitted onto the current plates.

      • Action: Redesign plates.

Risks and Areas of Concern

• • How to create forward and backward direction of drive mechanism

  • How to determine which direction the drive mechanism is going after implantation

  • How to lock and unlock the device to change direction after implantation

Resources or Information Required but not Available

• • How to access and what is the cost of a metal 3D printer?

  • What force will displace the skull? How can we gather quantitative measurements?

  • What remote control mechanisms are used for biomedical devices?

Schedule

• • Describe upcoming milestone.

    ☑ Attend live surgical implantation of distraction device (3/13/2018 at 7:30am).

• • • Perform FEA on 3 CAD designs of (1) mechanical drive system and (2) plates.

    • Create 3D printed scaled prototype.

• • Update Gantt chart (link).