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Syringe Modification for Spinal Injections!

This presentation outlines a novel syringe attachment designed to improve the injection of viscous materials into the vertebral column. Aimed at facilitating treatments for patients with osteoporosis and similar conditions, the device enhances grip and control, fits standard 5cc syringes, and is autoclavable. The final design features a gear-driven mechanism for precise flow regulation, allowing surgeons to work with varying injection speeds efficiently. Our approach prioritizes ergonomics, reliability, and cost-effectiveness, with plans for prototyping and testing outlined for future development.

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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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