Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Prototype of linear slider has been built and tested
Improved designs of linkage mechanism have been thought of and put into Solidworks
Analysis to appropriately dimension the new designs has been completed
Analysis on the forces needed to open the new designs has been started
Ideas for opening and safety mechanism for all of the new designs have been brainstormed
Some of the new designs have already been eliminated due to size or power contraints
Accomplishments from Previous Week
Begun work on new design concepts to continue search for best plate mechanism
Models of the new designs have been put into CAD
Analysis of the new designs has been started in order to determine the correct dimensions and mechanical advantage of each device
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Consult with sponsor about the new designs that we have come up with - Stephanie
Complete analysis on force needed to open each of the devices - Travis
Decide on which design (or perhaps two) to move forward with - Team
Purchase the materials needed for next prototyping phase - CJ
Begin to design safety mechanism options for the designs we are continuing with - Justin
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Notes from meeting with Dr. Mazzei on 5/1/12
He really likes the idea and look of the linear slider prototype
He believes the linear slider idea is worth another iteration
He could see an advantage to mounting the device on the side of the table
In a lot of operations the line runs to the ground so that it can move over a warmer, so having the tubing hang low would not be an issue
He likes the idea that the bed would be more stable than the pole and could give more leverage when opening the device
When thinking of shear forces, do not only focus on the potential damage to red blood cells, also consider the fact that the bag could burst at the seams
Best to avoid shear as much as possible
If the flow of blood needed to be stopped in the middle of the process, the lock on the line itself would be used, the device doesn't have to reopen
The advantage of selling two devices together is small, but it is a possibility
He likes the idea of having the front panel be clear
Device should not have many joints or porous areas where blood can seep into, it makes it less sanitary and therefore less reusable.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Notes from meeting with Professor Delson on 5/1/12
We need to make sure that we understand mechanical advantage
A lever will have a variable amount of mechanical advantage
Could potentially use a hand crank
List of current problems:
Jamming
Opening
Locking mechanism
Do we have a safety device for if the lock fails without the bag being inside of the device?
Work on a few more concepts, including:
Four bar linkage
Straight line mechanism
Decide with the sponsor where he would like the device to be loaded
Is it ok to have some shear or should we avoid it entirely?
For presentation, have a lot of concepts, pictures and analysis.
Notes from meeting with Mike on 5/7/12
Try re-dimensioning the four bar linkage design to reduce the shearing on the bag.
Panini Press: He was concerned with how loading the device on spring at a time may cause issues with uneven pressure on the bag.
We need to focus on the mechanical advantage of the designs because that is what is going to make or break our designs.
The utmost concern should be designing for use.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
None
Risks and Areas of Concern
Biggest area of concern right now is determining whether or not our device can be opened by a medical professional
Safety mechanisms for the new designs need to be determined
Resources or Information Required but not Available
None
Schedule
Build two more prototypes
Another iteration of the linear slider at the sponsor's request
Choose a design from our new concepts to build
Budget (list amount spent and amount remaining)
Spent: $200
Remaining: $2300
Progress on Report and Webpage
First draft of report and webpage have been submitted
The next step on the webpage is to ensure that the multimedia page is organized and completely up to date with photos and CAD of designs and prototypes