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Catheter Design

Catheter Design

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Catheter Design

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  1. Catheter Design Advisor: Dr. Ted Larson Cynthia HarmonJarntip Pitayagulsarn April 10, 2002

  2. Dr. Ted Larson • Vanderbilt University • Assistant Professor of Radiology and Radiological Sciences • Assistant Professor of Otolaryngology • Director of Interventional Neuroradiology • Director of Head and Neck Radiology

  3. Project Definition • Objectives: Determine a new design of a catheter that will increase control and maneuvering • Solution: Implement stitching along tubing of catheter

  4. Ideas for the Catheter • Wings on an airplane • Dimples on the golfball • A parachute • The curve of a frisbee • And the decision… stitching on a baseball

  5. Catheters and the Carotid Artery • High degree of branches and extremely tortuous • Do not necessarily want catheter to go in the direction of blood flow • Present complications when maneuvering the catheter

  6. Arteries to Aneurysms • Carotid artery helps lead to brain aneurysms • Coil will be inserted with aid of catheter to block blood flow into the aneurysm • Once complete, catheter needs to be removed from body

  7. Current Status • Built a model to test the effect of stitches on the catheter • Implement different kinds of stitching on model to determine optimal orientation • Determining the Reynolds Number

  8. The Flow Similarity Model • Large tube signifying the artery • Small tubing used as catheter • A pump pumping a “blood like” substance • Flow measured with bucket and stopwatch, using volume and time • Tubing's effects observed within the tube during flow

  9. Flow of Blood • Reynolds number=250 • Re=ρDv/μ • flow rate .02925 m/sec to hold same Reynolds number • Glycerol Water viscosity=2.5cp • diameter=1.5875 cm • density= 1130.5kg/m^3

  10. Key Issues • May cause blood clotting • Difficulty in removing catheter from the body because stitching may get caught • Stitches may have negative impact on catheter • Many possible designs to test

  11. Future Directions • Use Reynolds number of 250 • Determine the density through displacement • Measure weight and water coming out of tubing, to determine the flow rate • Observe the effects of different stiching

  12. References • Kerber, C. W., Heilman, C.B. “Flow Dynamics in the Human Carotid Artery: I. Preliminary Observations Using a Transport Elastic Model.” American Journal of Neuroradiology. Jan/Feb 1992, Vol 13, No 1. 173-180. • Griffing, David, f. The Dynamics of Sports. Dalog Company: Oxford, Ohio, 1987. • Kuethe, A. M., Chuen-Yen, C. Foundations of Aerodynamics. Wuinn-Woodbine, Inc: Phoenix, Az. 1998. • www.breg.com/.../ painmanagement_accessories.html • www.vesalius.com/.../caro_anat/ cfsb_caro_anat1.asp • www.russellchun.com/ brain.html • www.kenkifer.com/bikepages/ touring/bags.htm