Overview of Status of Analysis, Design, Fabrication, Tests, etc.
4/10/2019: Completed Foam Testing (in person, @ UCSD Radiology 6:30 pm). All of the foam options passed the radio-translucence test, but some failed the beam-dispersion test, making them unsafe for use. We determined the denser, gel-type memory foams were causing the dispersion to be stronger. (See foam testing Excel sheet under internal-> files). We have two foam options to pursue which had percentages of beam dispersion that are equal or lesser than the current minimal padding used on the table for patient comfort.
Have two iterations completed for the tray, but as per our sponsor meeting from 4/11/2019, we need to redesign it.
Accomplishments from Previous Week
4/11/2019: Had a sponsor meeting (in person). Dr. Pawlicki liked the changes we made with respect to the air pockets ( we eliminated the height adjustability). He was pleased about the material choice for the tray which was carbon fiber. We also showed him our first two iterative designs and expressed concerns of weight with such a large tray (7 ft x 2 ft x 0.025 inches thick). We then concluded that he would prefer it to be half as long, making it only about 4 ft long. This will eliminate the weight problem, make it easier to maneuver and store.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Determine final dimensions of the length of foam (Daniel)
Have a finalized tray design, and have a quote for a manufacturer to make it. Confirm with the manufacturer that they will make the tray. (Sanil)
Choose a pressure distribution block so we know the dimensions to affix it to the tray (Johnathan)
Send the air pockets out to be made (Kevin)
Find a heel foot locating device (Daniel)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
All of the following from in person on 4/11/2019
Make it have holes for the indexing lock bar
Make it such that it can be hung on the wall with hooks, like the existing carbon fiber restraint device
This should be easy to meet, as we intend to have the tray be a framed X design. hooks can be screwed into the wall as is already customary in the suite, and the device can be hung vertically. Velcro will have to hold the foam into the tray so it does not fall out.
Dr. Pawlicki would like there to be large velcro straps on the side of the tray that can be extended out across the patient's torso. This is for comfort and to help the patient feel like they are securely held in place (table is narrow and they are fairly high off the ground).
Put the foam inside an easy cleanable zipper mattress cover.
Have indexing on the head donut velcro so they can keep track of patient settings in their chart
Make sure the patients bottom doesn't fall off the bottom of the last air pocket
We discussed the one way pressure valve to keep more pressure in the bottom pocket, to hold this higher concentration of weight
Continue to make sure there is a recession in the carbon fiber tray on the side to ensure people don't hurt their legs while swiveling onto the tray
including this in next design iteration
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Concerns about environmental friendliness of rubber materials (in person 4/8/2019)
Selected the mattress cover with a urethane lining. This is classed as an FDA class 1 med device, and is certified BPA and toxins free.
Risks and Areas of Concern
Weight concentration on top of the lowest air pocket. We have the one way pressure valve in place to help air stay in that pocket currently.
Carbon fiber tray cost
Schedule
Still on track for prototype by the end of the month.
Need to push finalized tray design, to get "ok" from sponsor by this thursday
Order air pockets this week once tray dimensions are finalized.
Budget (list amount spent and amount remaining)
400$ worth of foam, most of it will be returned however.
6600$ remain
Progress on Report and Webpage
Webpage filled out with some more information and sponsors info.
Updated internal files to have call history and meeting notes
Foam testing data uploaded
Report Chapter 1 sections have been uploaded