156B Week 6

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

• • Fabrication for 3rd prototype

  • Testing preparation - collect velocity / insertion depth data

  • Energy Analysis - Fatigue, Torque

Accomplishments from Previous Week

• • 2nd Prototype Testing

    • Broken parts

    • Cannot be fixed (requires 3D printing)

    • Move on to 3rd Prototype Production

  • 3rd Prototype Production

    • Utilized 3D printer

    • Requires fabrication & testing

  • Proof of Concept Presentation

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • 3rd Prototype - fabrication / testing completion (Peter, Dohwan)

  • Stylet fatigue analysis & torque analysis (Dohwan)

  • Acquire customized (actual) stylet and cannula (Dohwan)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Conference call via UberConference 5/4/17 2:30pm-3:20pm

  • Dave: Wants to know the speed of the stylet after firing

    • Use extra slow motion video

  • Dave & Kennie: The device requires additional guidance

    • Attach something to the bottom

    • Possibly prevent buckling problem

  • Kennie: Final Design Review schedule (Week 10)

    • TBA

    • Dave may visit Cap Bio on Wednesday of Week 10

  • Dave: Design revision

    • “Poke Yoke”

    • Implementing a design mechanism where an error stops entire movement of device

    • Anything that helps prevent errors in operating by users.

    • Will typically feature a design that fits only in one orientation

  • Stylet model (music wire) is not representative of the final product stylet + soft cannula assembly, however diameter is useful for creating housing device

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Proof of Concept Presentation, 05/01/2017, 3:00pm~5:00pm

  • Shigley : work on the fatigue analysis

  • Use PVC housing case (instead of brittle 3D printed material)

  • Current movement is not constraint

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • Proof of Concept Presentation, 05/01/2017, 3:00pm~5:00pm

  • Q: Does the needle moves drastically inside the tissue?

    • A: We believe that it is due to the free movement after the needle is disengaged

  • Q: What is the final product materials?

    • A: The final product material for our project is ABS, the 3D printed material. However, the client will follow the medical-grade standard.

Risks and Areas of Concern

• • Whether the thicker housing case can secure or constrain the movement of needle

  • Design revision with needle retraction mechanism

    • Our team exceeded Capillary Bio’s design team progress

    • We became the “pioneer”

Resources or Information Required but not Available

• • N/A

Schedule

• • Describe upcoming milestone

    • 05/11/2017: Design Revision & Testing Completion

    • 05/22/2017: Preliminary Design Review

    • 06/05/2017: Final Design Review (tentative schedule)

  • Update Gantt chart.

    • Completed

Budget (list amount spent and amount remaining)

• • Budget:$700.00

  • Spent: $236.70

  • Remaining: $463.30

Progress on Report and Webpage

• • Updated (05/07/2017)