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Syringe Modification for Spinal Injections!

Syringe Modification for Spinal Injections!. BME 201 Mid-semester Presentation Team Members: Eric Miller, Christopher Valley, Kevin Kinney, Jackie Gerhart Advisor: Nimmi Ramanujam Client: Michael Tuite, Dept. of Radiology, UW Hospital. Overview. Introduction to Spinal Injections

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Syringe Modification for Spinal Injections!

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  1. Syringe Modification for Spinal Injections! BME 201 Mid-semester Presentation Team Members: Eric Miller, Christopher Valley, Kevin Kinney, Jackie Gerhart Advisor: Nimmi Ramanujam Client: Michael Tuite, Dept. of Radiology, UW Hospital

  2. Overview • Introduction to Spinal Injections • Problem Statement • Design Specifications • Alternate Designs • Final Design and Evaluation • Future Work • References

  3. Introduction: What are Spinal Injections? • Injection of a cement-like substance into the vertebrae • Substance replaces deteriorated bone • Used to elongate and straighten spinal column • Helps patients with osteoporosis and similar back problems Picture courtesy of: http://www.combo.com/ergo/spine.htm

  4. Problem Statement • The goal of this project is to design a syringe attachment to aid in the injection of viscous material into the vertebral column. • The device should: • Provide a better grip or an easier way to force the material through the small needle • Fit a standard disposable 5cc syringe • Be easily attachable

  5. Design Specifications: The Device Should… • Be autoclavable for reuse • Allow surgeon to be in total control of flow rate into and out of spinal column • Be ergonomic • Be inexpensive • Be easy to design and manufacture • Be reliable

  6. Introduction: Current Solutions for Spinal Injections. Viscous Fluid Injection System - 1360 • Self contained compressor and dual syringe injection • Flow rate not easily controlled • Dual syringe system not necessary Picture courtesy of: http://www.dorc.nl/catalogus/vfi.html

  7. Introduction: Current Solutions for Spinal Injections Harvard PHD 2000 Syringe Pump • Stationary mechanical dual syringe pump • Impractical for use in spinal injections • Expensive Picture courtesy of: http://www.antecleyden.com/harvard.html

  8. Alternate Designs: Design 1Handle Attachment 2 • Two-Piece attachment • Piece 1 provides more surface area for fingers • Piece 2 provides cushion and extension for palm • Easy retraction and inexpensive 1

  9. Alternate Designs: Design 1Disadvantages • Still requires a lot of force by surgeon • Comfort • Flow regulation can be improved

  10. Alternate Designs: Design 2Gun-Type Design • Inexpensive • Requires less force • Use of whole hand for force application

  11. Alternate Designs: Design 2Disadvantages • No retraction • Poor control of flow rate

  12. Final Design: Gear Forced DesignPiece 1: Chamber • Opening for syringe viewing • Locking mechanism for syringe finger tabs • Houses two gear systems with one control dial • Guidance track for piston • Spring loaded guard door for syringe body • Hand grip for increased comfort

  13. Final Design: Gear Forced DesignPiece 2: Piston • Two gear tracks • Fast injection • Slow injection • Locking mechanism for piston attachment to syringe

  14. Final Design: Gear Forced DesignSteps of procedure • Load syringe with injection material • Slide syringe in chamber mechanism and lock • Close spring loaded flap • Lower piston to syringe plunger for attachment and locking • Connect to needle • Injection

  15. Final Design: Gear Forced DesignComplete

  16. Final Design: Gear Forced DesignAdvantages • Easy to load and unload • Easy retraction • Less force required from hand • Precise • Less concentration required • Variable speeds

  17. Final Design: Gear Forced DesignDisadvantages • Weight • Expensive • Possibility of malfunction

  18. Comparison: Designs 1-3

  19. Future Work • Develop finalized drawings • Build prototype • Testing • Load/unload • Retraction • Locking mechanisms • Flow rates • Durability/strength

  20. Future Work • Consideration of possible additions • Motor • Battery pack

  21. Questions?

  22. References Dutch Ophthalmic Research Center. D.O.R.C. V.F.I. System. 2000. http://www.dorc.nl/catalogus/vfi.html31363D. (March 4, 2002). Harvard Apparatus. Harvard PHD 2000 Syringe Pumps. 2000. Antec Leyden. Zoeterwoude, Netherlands. http://www.antecleyden.com/harvard.htl#PHD2000. (March 4, 2002). Scribner, R.; et al. United States Patent Office. U.S. Patent Number 6,241,734. June 5, 2001. Kyphon, Inc., Sunnyvale, CA. (March 4, 2002).

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