Team 9: Rady ECMO Simulator

Progress Report Week 6 Winter Quarter 

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

• • User testing session with pediatric surgeon Dr. Timothy Fairbanks for tissue

    • Muscle: 

      • The clear silicone caulking was the best option, either spread in a thin slab or in connected strands

    • Skin:

      • Our skin had a realistic texture and color, we are working on making George’s model to compare manufacturing

    • Flesh: 

      • Ballistic gel had a very accurate texture, and the surgeon was very impressed. The shorter and easier manufacturing also impressed George.

Accomplishments from Previous Week

• • Skinfold:

    • Decided to rebrand “skinfold” as “tissue”

  • Pressure delivery:

    • Last components for testing pumps & entire flow system have been ordered

  • Team:

    • First round of testing with surgeons went really well, our materials choice and design decisions have been validated

  • Muscle model: 

    • Found appropriate and cost-effective model: silicone caulking with food coloring

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

• • Tissue (Reem and Rahaf):

    • Redesign 3D printed enclosure to be smaller

    • Design neck collar to minimize risk of leaks

  • Pressure Delivery(Guinevere, Yichen, and Samantha):

    • Test all 3 pumps

    • Evaluate pumps and chose a prefered pump

  • Team: 

    • Perfect muscle model

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• • No need to mimic pulse in the pressure delivery system, as the procedure happens so quickly that a pulse wouldn’t be noticed anyway.

  • Veins need to be two times larger in diameter than arteries

  • The box containing tissues has right size and mimics anatomical restrictions

  • Try to use glycerin and food color to make the artificial blood

  • Comments on muscles: 

    • The texture & thickness (~4mm) of the clear silicone with food coloring was good for babies

    • The texture & thickness (~6mm) of the clear silicone with silicone coloring was good for older patients, but was too tough

    • The fibrous option was great for fibrous nature of muscle

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• • Change the duration on casting glycerin & gelatin. 

  • Professor appreciated that there are three approaches to test the material. 

Risks and Areas of Concern

• • There are electronics in the mannequins that Rady will be using: we don’t want leakage from the “blood”

Schedule

• • Gantt chart: