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Right Angle Screwdriver

This project explores a new right angle screwdriver specifically designed for reconstructive surgery of the mandible, aiming to enhance surgical efficiency and minimize incisions. Current procedures require external access for screw fastening, which this design addresses by developing an instrument that fits within a standard incision size (3-5 cm) while providing adequate torque. Various design ideas, including worm and wheel, bevel gear, and sprocket and chain systems, are evaluated for their pros and cons. Future work includes testing torque capacity and durability for surgical applications.

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Right Angle Screwdriver

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Presentation Transcript

  1. Right Angle Screwdriver Advisor: Thomas Yen Client: Ashish Mahajan

  2. Overview • Reconstructive surgery of the mandible • Current Screwdriver • Design Requirements • Alternative Designs • Design Matrix • Testing and Future Work

  3. Reconstructive surgery of the mandible • Broken mandible repaired with use of titanium plates and screws • Current procedure uses straight screwdriver • Incision made in gums to see screw • Incision made to the exterior cheek for screwdriver access • Plates left in after surgery

  4. Current Screwdriver • How it works • Straight screwdriver • Ball bearing handle • Interchangeable screw head • Pros: • Efficient for fastening screws in surgeries other than the mandible • Cons: • Cannot reach mandible without exterior incision • With extra incision, screws are still hard to access

  5. Design Requirements • Create a right angle screwdriver that will eliminate need for an exterior incision • Specifications • Must fit standard incision size (3-5 cm) • Maximum thickness of 1.5 cm • Safe and sanitary according to surgery protocol • Must supply sufficient torque to seat screw

  6. Design Idea #1 • Worm and Wheel Design • Using gear and rotating thread • Pros: • Gives high levels of torque • Works at a right angle • Cons: • Surgeon loses “feel” of screw • Increases number of turns per screw

  7. Design Idea #2 • Bevel Gear • 2 mitered gears set at a right angle • Pros: • Can be easily enclosed • Applies sufficient torque • Cons: • Too big for specifications

  8. Design Idea #3 • Sprocket and Chain Design • Two sprockets connected with a chain • Handle and screw head at opposite ends • Pros • Provides 1:1 torque • Able to fit in small incisions • Use existing screw driver for handle and screw head • Cons • Moving parts make it hard to sterilize

  9. Design Matrix

  10. Testing and Future Work • Find torque needed to seat screws • Find torque load capacity of prototype • Making the prototype enclosed • Test durability • Design interchangeable screwhead

  11. Special Thanks • Ashish Mahajan, MD Resident, Plastic and Reconstructive Surgery, Client • Dr. Venkat Rao, MD, MBA, Plastic and Reconstructive Surgery • Thomas Yen, PhD, Advisor

  12. Questions?

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