156B Week 5

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

• • Created muscle model (stripes of rubber; elastic bands)

  • Strain testing of muscle materials

  • Design of tubing/plumbing for blood flow

  • Begin comparison and selection of pump

Accomplishments from Previous Week

• • Skinfold:

    • Gelatin proven to be a viable material to create flesh layer that surrounds vasculature.

  • Pressure delivery:

    • The fish tank pump delivers a good amount of water pressure. Could be used for arterial pressure source.

    • Other higher pressure pumps have been delivered and will be compared. 

    • Found appropriate tube connections to build the system.

  • Team:

    • Designed a neck collar concept to contain the skinfold.

  • Muscle model:

    • Purchased elastic band and rubber sheet to simulate muscle.

    • Cut rubber sheets into thin strips to simulate the fibrous nature of sternocleidomastoid muscles.

    • Added silicone over rubber strips and tested the strain.

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

• • Skin fold (Reem and Rahaf):

    • Prepare a model for surgeons to test. 

    • Assessment metrics 

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

    • Test another pump to see if the pressure delivered is closer to real arterial blood pressure.

    • Design a pump system to accommodate blood pressure difference in veins and arteries.

    • Make artificial blood. Dye it blue for venous blood and red for arterial one.

  • Team: 

    • Continue to develop neck collar design, and how to contain internal components.

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

• • The neck collar design is creative and could be convenient to be assembled to a mannequin.  The sponsor would provide the team with a mannequin similar to the one used in the final design for tests.

  • Confirmed with the sponsors of the design of skinfold and muscle setups. Ordered rubber, elastic bands, and silicon to build prototype and muscle models.

  • Scheduled an appointment with some surgeons on Thursday to test current materials for veins, muscles, and skinfold.

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

• •  Contact Greg to do a material testing (Rahaf has contacted Greg and talked to him in person to complete material testing) 

  • Google Scholar might not be valuable in understanding background information 

Risks and Areas of Concern

• • Finding a material to simulate the fibrous nature of sternocleidomastoid muscle, while maintaining realistic elasticity.

  • Creating a design for neck collar that can keep the muscle material taut while surgeons retract the muscle to access veins.

Schedule

• • We are planning on combining the efforts of the two subteams starting week 5&6 into our first iteration of the whole design. Both teams will continue to improve their subcomponents, while keeping track of the overall simulation and ensuring compatibility.

  • Gantt chart