Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Design & Fabrication - add a design feature to implement needle extraction
3rd prototype has been successfully created by 3D printing the materials
3rd prototype is more robust than previous iteration
Revision of Design - the client wants us to implement custom stylet and cannula into our device
Accomplishments from Previous Week
Preliminary buckling analysis - possible major risk for device failure
Performed device launch speed analysis
Acquired custom stylet with 30 degree bevel and a cannula for design revision
Prototype Production & Testing
Fragile, plastic parts were reinforced with metals, mainly screws
Device successfully penetrates ziplock bag and ballistic gel set up
Insertion depth decreases with an increasing amount of trials, indicating the device successfully lives up to its 'one time use' expectation
insertion depth of up to 10 mm was observed during our trial
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Make appropriate edits in Report Draft, add a section for nomenclature (Ryan)
Keep the webpage updated (e.g. Progress Report, Gantt Chart, Homepage, and etc) (Dohwan)
Set up buckling model with MATLAB and send buckling analysis report to the client (Dohwan)
Acquire 29G and 31G music wires and compare testing results of 22G music wire with 29G and 31G music wires (Dohwan)
Reinforce the side/middle portion of the device with stronger material (Peter)
replace old music wire with new, thinner music wire onto device to prep for testing (Peter)
Perform testing with new music wire on ziplock bag+ballistic gel combination (Maverick)
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 5/11/17 2:30pm-3:20pm
Design Revision - detachable bottom layer
Sponsor is impressed with the prototype
Buckling Analysis
Client does not know material properties for nylon cannula (e.g. Young’s Modulus)
55 barometer nylon
Model as a hollow tube with OD of nylon tube and ID of 29G stylet
Kennie and Dave were “speechless” for awhile when the buckling analysis shows that the custom needle may not work out eventually
Reconsider deliverables
The current prototype has used music wires; however, the actual product requires the custom needle and cannula
How can the team restructure the design for the new needle?
For now, use 29G / 31G music wires for testing
Next week: talk about realistic goal & deliverables
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Instructor Meeting; Monday 5/8; Dr. Tustaniwskyj, Pedro Navarro
Analysis:
Choose more representative models, be prepared to justify choice of model and boundary conditions
Will need to do analysis on materials used for testing, and final design recommended materials (Stainless steel music wire and stainless steel 304)
Fixed model is not representative of our system
Report Feedback
Past Tense
Change Placeholder font
MLA Format
Metric (English) units
Reduce redundancy
Add a section for nomenclature
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
Stiffness of custom needle is not strong - buckling issues have occurred for sponsor and are reflected in our analysis
Deliverables - using the music wires or the custom stylet?
Resources or Information Required but not Available
N/A
Schedule
Describe upcoming milestone
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: $275.82
Remaining: $424.18
Progress on Report and Webpage
Updated (05/14/2017)