156B Week 2

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

• • Observed brachtherapy procedure

  • Finalizing decision to buy a motor package from OrientalMotor

  • Identifying additional components like encoders, sensors, LED display that will need to be purchased in the future

• Completed first CAD models of design for Design Proposal Presentation on Thursday, 04/13/17

  • Completed slides and rehearsal for Design Proposal Presentation

• Will meet with sponsors 1 P.M. Friday 04/14/17

Accomplishments from this Past Week

• • Completed Individual Component Analyses

  • Observed brachytherapy procedure 12:30 P.M. Monday, 04/10/17

    • Measured time necessary to manually measure 1 catheter

  • Decided to order motor package from OrientalMotor

    • Spoke on phone with applications engineer from OrientalMotor for clarification of motor specs and product recommendations

  • Spoke on phone with Varian Medical Systems technical consultant for afterloader specifications -- key specs not offered (04/10)

  • Further analyzed individual components and overall design for Design Proposal Presentation

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

• • Finalize desired motor package and purchase through Roxanne (Eric, Dylan)

  • Finalize CAD model for Proposed Design (Dante, Jefferson)

  • Use motor package to build prototype of friction drive (All)

  • Construct chassis prototype (All)

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

Sponsor Comments, From Week 1 In-Person Meeting with Dan and Laura, 1 P.M. Friday, 04/07/17

• • Preference for friction drive over direct drive for proposed device

  • Set date for brachytherapy observation

Sponsor Comments, From Brachytherapy Observation with Dan and Todd, 12:30 P.M. Monday, 04/10/17

• Preference for device to be taller instead of flatter and wider

• Desire for redundancy of measurement in final product

  • Example: 2 encoders

Team Actions

• Identified motor package that could be used for rapid prototyping of both the friction and direct drives

  • Prototyping of friction drive will be prioritized

• Attended brachytherapy observation

• Documented sponsor preferences for geometry of device and redundant measurements

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

Instructor Comments, From Weekly Meeting, Thursday 4 P.M. 04/06/17

• • Continue to think about design risks and production feasibility. 

Team Actions

• Continued analysis of device components

• Created initial CAD models of potential device designs

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

• • N/A

Risks and Areas of Concern

• • Time Risks (e.g. manufacturing of device and receiving shipment of parts on time)

  • Design Risks (e.g  design is prone to high failure rate)

  • Production Risks (e.g. prototype is impossible to manufacture)

  • Hardware Failure Risks (e.g. purchased components are incompatible with design or prone to high failure rate) 

  • Project Failure Risks (e.g. design is unable to work or be manufactured within the time-frame limit)

Resources or Information Required but not Available

• Manufacturer specifications of the medical devices already in use (e.g. HDR afterloader, Li-Ni wire)  ---  unable to acquire after phone call due to "patent"

  • Mechanical properties of selected motor, encoder, and sensor components

  • Material properties of considered hardware components (e.g. chassis, friction drive belt, rollers and bearings)

Schedule

• • Upcoming milestone: Proof of Concept presentation two weeks on Thursday, May 4, 2017.

  • Complete: Prototype for the brachytherapy measuring device by Tuesday, May 2, 2017.

  • Receive: Shipment of parts selected and purchased (including motors, encoders, and sensors)

Budget (list amount spent and amount remaining)

• • Total: $ 7500

  • Used so far: $ $489.99

  • Remaining: $ 7010.01

Progress on Report and Webpage

• • Completed "Welcome" and "Project Team and Sponsors" pages

  • Completed Week 2 Progress Report

  • Completed Individual Component Analyses

  • Completed First Draft of Overall Report (attached as a File to this page)