Mixing and Injection System for Polyurethane Scaffolds Michael Scherer Dustin Dowell Andrew Solomon...
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Transcript of Mixing and Injection System for Polyurethane Scaffolds Michael Scherer Dustin Dowell Andrew Solomon...
Mixing and Injection System for Polyurethane Scaffolds
Michael SchererDustin DowellAndrew Solomon
January 17th, 2007
Background
Indicated for:– Small bone fractures (i.e. distal radius fracture)– Bone cancer repairs (void filler)– Antibiotic delivery– Growth hormone delivery
Operating room materials:– Two pre-packaged components (hardener + isocyanate)– Mixing device– Syringe
Procedure
In the OR, the polymer is stored as two separate components
When needed, both elements will be added to the container.
The container will then be inserted into the mixing fixture.
Procedure
After mixing is complete, the container is removed from the fixture. (Mixing time TBD)
Ideally, for injection, an attachment will be employed to move the mixture into an injection device.
Once attached, the mixture would be forced out of the container by pushing the moveable container bottom.
5-10 minute working time depending on composition
Current Budget Estimate
Item Cost Dremel $75 (known)Agitator $150 (estimate)Canister $50 (est.)Device Housing $50 (est.)Miscellaneous Fixtures $50 (est.)
TOTAL: $375 Notes:
– Agitator requires special manufacturing– All estimates are conservative
Current Work
Fabricating an agitator; finalize design
Waiting on supplies– Dremel tool– Canister
Trying to get in touch with Dr. Papay– Specific applications– Volumes
http://www.postmixing.com/mixing%20forum/images/rt6.jpg
Future Work
Experimental testing– What speed to mix (5,000 – 15,000 RPMs)– How much mixing time is needed (30 - 90 s)– Optimal agitator design– Achieve necessary physical properties
Develop a system for transferring mixture from canister to syringe