Week #3 - Brinkley Brooks

This week consisted of a lot of brainstorming, planning, and researching. I also contacted the client multiple times to figure out a shake down test we will be doing soon, and to update our deliverable 1 and 3. I also worked on making tasks and timeline for deliverable 2. 

Brainstorm: Decided on a remolded Ahmed valve with rubber material resistance (elastic) with a possible dissolving factor. This will be a combination of strategy 1 and 3. 

  1. Elastic Resistance - most similar to Ahmed valve, but will change the resistance post fibrosis to have a better success rate

2. Magnetic Resistance - uses a magnet to open and close a valve to vary the flow


3. Dissolvable Resistance - Using a material that over time dissolves, so that once fibrosis occurs, the part of the valve that doesn't need to be there will be gone


Client Meeting Notes: 
  • Here are the notes I took during the client meeting. We discussed the schematic that we will be following for our shakedown, and the principles behind it. 
Lab Set Up - 
  • Using a lab set up from bio fluid mechanics, we will be able to perform a shakedown on the Ahmed valve to test a theory. I was able to find the protocol from my old documents to help me go over it and better understand what we will be doing. 



Research:

  • Started off by researching a sensor that could be used in our shakedown. This is the one that our client, Dr. Rickard, helped us find
    • It has an output that is compatible with Wheatstone bridge
    • It must be connected to a circuit board that then connects to a software that would give the output readings. 
    • Can be used for dry or wet data

  • Looked at Silicone Properties 

https://reader.elsevier.com/reader/sd/pii/S1751616119312949?token=068A68E32A8F822E0C0343D8D68FC9A44C7ED37DCA3EB04F1991C4B394056A684D878ABE213DD62FB97FEBC15610F726&originRegion=us-east-1&originCreation=20220926180843

    • This article is trying to find the bet material to mimic organs
    • Shore hardness was found by using a durometer 
    • This article describes a method for how to test different shore levels, not really information about silicone, so not super helpful for what I was researching.
    • Properties of silicone: heat resistant, flame retardent, chemically stable, good weather ability, radiation resistance, electrical properties
    • Silicone does not damage easily
    • Loss of modulus of silicone is small - could be a problem if we are trying to use that to vary resistance
  • Biocompatibility of Magnets (Only was able to read the abstract)
    https://pubmed.ncbi.nlm.nih.gov/7801229/
    • Rare earth magnets seem to be biocompatible 
    • Uncoated magnets of cytotoxicity. 
    • The biocompatibility of magnets is pretty inconsistent and contradictory


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