156B Week 1

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

• • After meeting with our sponsor, we are thinking about not moving forward with the pin design that connects the anchor wings. Instead, we would like to uses a solid piece of flexible metal.

  • From a top view, the original design had a rectangular profile. We will be rounding this design to a circular profile that will fit snugly into the cylindrical drill hole.

  • We have a meeting scheduled with a surgeon for 1 next Wednesday

Accomplishments from Previous Week

• • New design feature that we feel more confident moving forward with. The pin idea involved too many moving parts, had the potential for jamming, and posed the issue of highly concentrated stress on a weak joint.

  • Acquired sample sutures, and should hopefully be acquiring sample anchors next week when we meet with the surgeon.

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

• • CAD (Helen) and 3d print (Delta) another iteration of the anchor

    • Include holes for sutures

    • Smaller scale

    • Remove hinge

  • Finalize Sawbones order and send to Sameer for purchasing - Darren

  • Finalize testing setup using Instron and Sawbones material - Bryan

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

• • Provide updates on individual component analysis (Friday)

  • Look into clear material to visualize deployment and proof of concept (PDMS)

  • Sameer said we should finalize our material choice soon. Darren is narrowing down selection by continuing to study materials.

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

• • Professor had mentioned analyzing the stresses experienced by the pin. Now that we are moving away from the pin design, We need to analyze how the stress will be experienced by the flexible joint.

  • Target diameter is what soft anchors are right now (1.4-1.8mm)

Risks and Areas of Concern

• • Clearly seeing the wing deployment

    • Need a clear material to see what is going on

Resources or Information Required but not Available

• • Sample anchors

  • Cadavers

  • Porosity size of bone

Schedule

• • Getting to test wing deployment in clear material called PDMS

  • Fabricating prototype with deployment mechanism

Budget (list amount spent and amount remaining)

• • $0 spent

  • $1,100 remaining

Progress on Report and Webpage

• • Updated background and objective on website