1. Problem Statement
GOAL: To modify the needle used during a Fine Needle Aspiration (FNA) procedure. The modification should not drastically change the FNA procedure and still increase the amount of tissue removed for cytological testing. It should also minimize the time (by collecting an adequate sample size on the first attempt) and discomfort caused to the patient during the procedure.

2. What is FNA? Technique used to extract cells; no incision needed
Several insertions are usually required to ensure an adequate sample size
Samples are sent to pathologist to be analyzed
National Breast Cancer Center,

3. Fine Needle Aspiration (FNA)
A.D.A.M.,

4. Product Design Specifications
Removes adequate number of cells for diagnosis.
Should not cause more discomfort than current FNA procedure.
Constrained to standard gauge needle, client prefers 23-gauge.

5. Current Prototype Pre-manufactured drill bit 6” length
Fits in 23 gauge needle

6. Tissues Tested
Fixed cat tissues
Mammary
Lymph
Fat

7. Testing Procedures Old technique No insert used
Performed two separate trials on all three tissues
New technique
Drill bit insert used
Observed in saline bath under microscope

8. Sample Quantification
Old technique
Resulted in either a mass of cells or a minimal quantity of cells
New technique
More dispersed cell sample
Greater number of cells on average

9. Future Work Further prototype development
Research into appropriate materials to be used (stainless steel, Co-Cr, Ti)
Develop protocol for quantifying testing
Test on freshly removed tissue
In vivo testing of animal tumors
Cytological evaluation

10. Drill Bit Size Comparison

11. Tissue Sample- Mammary

12. Tissue Sample- Lymph

13. Tissue Sample- Fat

14. Old Technique- Mammary

15. Old Technique- Lymph

16. Old Technique- Fat

17. New Technique- Mammary

18. New Technique- Lymph

19. New Technique- Fat