Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Fabrication of a mandrel to create helical shaped needles for testing is planned. Must talk to Tom.
We expect the hypodermic needles to arrive this week. These will be used for testing insertion force required.
We expect the torsional springs to arrive this week.
Dave will give us a piece of ballistic gel for testing.
Besides having a 3D printed housing case, we will have all the required materials for testing this week.
Accomplishments from Previous Week
Ordered hypodermic needles and torsional springs for testing, we are now ready to perform testing.
Created a 3D model of the mandrel tool to help us create the helical shaped needles
Obtained all necessary materials needed for testing.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Finish CAD drawings of every needed component--mainly housing of the needle (Peter)
Begin 3D the housing device
Begin 3D printing of the mandrel, if cannot be machined by Tom
Fill out form to get reimbursement of our purchases: torsional springs and hypodermic needles (Peter)
Aquire mason jar and ziplock bag in order to simulate human skin
Figure out what force/entry speed of needle is needed to successfully insert helical shaped needle into body
create 30 degree bevel on hypodermic needle to create a cutting edge
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
(4/13/17-conference call): 30 degree directional block on the bottom part of our housing device needs to machined in such a way such that the needle will not get stuck within directional block
action taken: will create fillets at the edge and a slightly larger entry point to allow the needle to enter the directional block and enter the body at a 30 degree angle
(4/13/17-conference call): Why did we choose a 30 degree bevel?
action taken: Response: based off research paper, the optimal insertion force that can cut and penetrate skin occurs at 30 degrees.
(4/13/17-conference call): Look into 3D printing and how to reserve a printer, it may get busy.
action taken: Will ask Chris for information on how do we reserve a 3D printer for our housing device and possibly mandrel
(4/13/17-conference call): Make the mandrel smaller than our planned diameter for the hypodermic needle
action taken: Adjusted CAD model to comply with sponsor suggestion
(4/13/17-conference call): Attempt to make the insertion speed up to 200 ft/sec to minimize patient pain
action taken: Get correct torsional spring that can launch at that speed when released.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
(4/10/17-in person): How do we plan to lower the needle into the body by just rotating the top cover?
(4/10/17-in person): What are bevels and what purpose do they serve? (Multiple bevels v. just a single bevel)
Risks and Areas of Concern
How will our testing go without the 3D printed housing?
How can we prevent needle from getting stuck in directional block at the bottom of the housing device?
Do we have machine or 3D print the Mandrel
Resources or Information Required but not Available
3D printed housing device
ballistic gel from Dave
Schedule
Describe upcoming milestone
Update Gantt chart.
Budget (list amount spent and amount remaining)
Initial amount: $700.00
amount spent: $
budget remaining: $
Progress on Report and Webpage
The following sections of the report were completed: Background, Review of Existing Solutions, Statement of Requirements, Deliverables, Title Page, Appendix with Individual Component Reports