156B Week 3

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

• • Purchased scissor lift and acrylic to begin ramp prototyping

    • likely going with half-disposability for ramp (keeping internals and discarding externals)

  • Currently 3D printing first version of laryngoscope blade design

Accomplishments from Previous Week

• • Laryngoscope blade design adjusted after speaking to sponsor

  • Began looking into cushion material for infant support on ramp

  • Purchased parts to begin prototyping

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

• • Finish building skeleton of first version of ramp prototype - Everyone

  • Continue developing different laryngoscope blade designs to print to test with sponsor - Brendon

  • Continue developing cushion designs and placement on ramp - Emeline

  • Begin CAD of second version of ramp with new specifications from sponsor - Wendy

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

• • Sponsor meeting (4/14/17)

    • Discussed permitted materials in the medical setting

      • Silicone can be used to cover the ramp due to durability, texture, and ease of disinfection

      • Any plastics are permissible for ramp base - acrylic is fine

    • Suggested leaving the ramp surface flat rather than contoured to infant's body

    • For knob/dial, suggested adding a rotating handle (similar to handle of square block we machined in 156A in machine shop) for easier use

    • Asked how will the sharp edge of the ramp be fixed

    • Discussed the possibility of using an adjustable locking hinge

    • Typical infant dimensions are 20"x8", so ramp can be made 20"x10"

      • It is okay if their feet hang off the ramp

    • Wild idea: design a CAM for range of vertical motion

    • Blade design

      • Liked what was designed so far but wants to add further modifications

      • Need to widen the blade, curve the blade, and have a (diagonal) track starting at halfway and to the right of the blade to guide tube down

      • The blade needs to be curved at an angle starting at 1 cm from the end of the blade

  • Next meetings are scheduled for 4/20/17 at 3PM and 4/27/17 at 2:15 PM

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

• • Comments from Design Proposal Presentation (4/12/17)

    • Units must be METRIC

    • Need to be more specific when describing quantities and processes - "extremely easy," "relatively small," etc

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

• • Comments/Questions from Design Proposal Presentation (4/12/17)

    • Confusion on where the infant is placed on ramp and concern for moving parts under the neck

    • Could lose mechanical advantage with the knob on the scissor lift

      • Requires several turns of the knob to raise the lift a short distance

      • Suggested using similar height adjustment process as machine shop mill

        • Lock and unlock, then finely adjust

Risks and Areas of Concern

• • The scissor lift requires much more effort to turn knob than expected. It is still feasible, but not the most ideal for the doctor. (It requires many rotations as well)

  • Finding small free-moving hinges for the current design has been difficult and current solutions are dangerous to the infant.

Resources or Information Required but not Available

• • N/A

Schedule

• • Need to have a ramp prototype by the end of Week 4.

Budget (list amount spent and amount remaining)

• • Spent: $62.28

  • Remaining: $1437.72

Progress on Report and Webpage

• • Webpage updated: Budget form, CAD, Progress Report

  • Report Progress: Impact on Society portion to be completed by 4/21/17