Embedded Files
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Final runs of initial testing phase (continued)
Sameer has asked us to do some more testing and calibration before moving on
Beginning the redesign phase
Found circuit components to improve feedback and useability
Improving previous CAD models
Accomplishments from Previous Week
Stress
Completed first round of rubber band testing (John)
Split rubber band = severed
Stapled rubber band = sutured
Values for push/pull methods are different, which isn’t too surprising, now need to continue refining device
Found a few affordable and good quality LCD screens (Ryan)
Need to establish power requirements
Will enhance user feedback
Found battery packs compatible with Arduino that will allow us to have a completely handheld prototype (Ryan)
Strain
Looked into barbed/needled marker alternatives (Archana)
Found inspiration from acupuncture needles, derma rollers, etc.
Looked into typical biopsy markers and biocompatible liquid adhesives (Tejas)
Planned next stage of testing, will take place this weekend
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Stress (John and Ryan)
Generate a proper stress/strain curve based on readings
Create a schematic for both the push and pull methods
Continue to refine the handheld device and measurement procedure
Both the push and pull method will require a separate calibration
Establish power requirements for LCD display and other electrical components
Choice of battery pack will depend on power requirements
Strain (Archana and Tejas)
Will conduct testing on pasta noodles this weekend
Will try out barbed markers and the surgical ruler method mentioned previously and determine which one is more effective
Create a CAD model of barbed marker for now, think about machining process and scaling down later
Overall (All Members)
Continue testing and calibrating the devices
Create a list of components for the redesign phase
Start research for Intellectual Property filing after Thursday’s lecture
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 held on Tuesday, February 16 (over Zoom)
Planned the Sponsor Design Review to take place during regular meeting next Tuesday
Team will get ready to present new updates from this week
Talked more about intellectual property and encouraged us to make the description of the device as broad as possible for more protection
Will begin researching existing patents after the IP lecture this Thursday
During last phases of testing, wants us to document all design decisions regarding prototypes and anything else we might want to add or change
Will document and organize all decisions made, along with comments and recommendations for changes to integrate in next iteration
For stress:
Create a detailed schematic for the stress measurement procedure because the differences between the push/pull method may be unclear to the audience
Will create a simple illustration to demonstrate how each type of measurement is made on our rubber band model
Helpful for the audience to understand the orientation between the tissue specimen and the stress device
Current testing looks good, now focus on obtaining an accurate stress/strain curve
Will continue to improve testing and obtain more data for a better curve
For strain:
Create a CAD model of the barbed markers
Will get this done by the end of the week
Perform a second round of testing on partially cooked pasta noodles for both the barbed markers and the surgical ruler method while continuing to optimizing MATLAB script
Will test either this Saturday or Sunday afternoon
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Was asked last meeting if using dye or barbs on damaged nerve tissue is okay
From the sponsor: Yes, dye is already in tissue markers, and the barb is just there to create friction and grip the outer surface layer of the nerve
Given feedback about first draft of Final Report
In the process of making edits for the second draft due this Friday
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
N/A this week
Risks and Areas of Concern
Not active risks
Main area of concern/focus of team is to prepare next iteration to be as close we can get to what we want in a final design
Currently wrapping up the Initial Design Phase. Some additional testing will be done based on recommendations from our sponsor. Concurrently, we will be redesigning the CAD models to integrate the new circuit components and fix the tolerancing issues.
Resources or Information Required but not Available
Want to request access to prototyping tools including soldering iron and extra jumper cables if possible
Schedule
Thursday-Weekend:
Read through instructor comments for our website/webpage drafts. Make changes and submit <Due Friday Week 7>
Continue testing based on Sameer’s comments
Continue preparing lists of concerns, components to buy, and design decisions for design review
Continue working on preliminary design of next iteration
Monday-Wednesday:
Meet for design review amongst team and with sponsor
Begin changes to designs for next iteration
Buy all components for the redesign phase
Modify the original CAD model to account for tolerancing issues and new circuit components.
Work on Preliminary Design Review Presentations <Thursday Week 8>
Budget (list amount spent and amount remaining)
Amount Spent: $157.66 (will change next week)
Amount Remaining: $2442.34
Progress on Report and Webpage
Professor and TA comments were reviewed and second rough draft of report will be added to website by Friday evening
Will be constantly updated as team gets closer to final design
Webpage will be updated soon
Professor and TA comments were reviewed and minor fixes will be made to the team website by Friday evening
Page updated
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