Bone Reduction Forcep Allowing for Both Continuous and Discrete Adjustment

Technology #18507

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Final proof of concept prototype which embodies the worm and rack mechanism as well as the 5-bar linkage concept.Demonstration of the additional degree of freedom enabled by the 5-bar linkage.Demonstration of reduction and free floating stabilization of transverse bone fracture in mock surgical scenario with bone under simulated musculoskeletal forces.
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Inventors
Professor Alexander Slocum
Department of Mechanical Engineering, MIT
External Link (pergatory.mit.edu)
Jacob Mooney
Department of Mechanical Engineering, MIT
Nicholas Kwok
Health Sciences and Technology, MIT
James Connor
Department of Mechanical Engineering, MIT
Managed By
Ben Rockney
MIT Technology Licensing Officer
Patent Protection

Bone Reduction Forcep Allowing for Both Continuous and Discrete Adjustment

Provisional Patent Application Filed

Applications

This invention is a bone reduction forcep.

Problem Addressed

Existing bone reduction forceps, used in over 200,000 hand surgeries annually, do not allow sufficiently fine adjustment of the clamping force resulting in longer, more difficult procedures, increasing the risk of further bone breaking, anesthesia complications, misunion, or nonunion. This invention is a forcep design that allows both continuous and discrete force adjustment and an extra degree of freedom to provide quicker and more stable anatomic alignment in fracture reduction. This forcep design may be used for hand reduction surgery or generalized to forceps for larger bones and other surgical tools.

Technology

This invention has three design features to improve surgical outcomes.  First, a clutchable worm and rack locking mechanism allows for fine control as well as gross adjustment over the tightening and loosening of the forceps. Current devices increase clamping force in discrete intervals and, when released, release all of their force at once. Alternatively, existing fine control mechanisms allow for sensitive control to achieve proper anatomic alignment, but are slow and cumbersome to use, and often do not allow for a desirable “complete release” feature. This design combines the best of both aspects, allowing a surgeon to achieve gross control for rapid alignment, with the added benefit of fine control when needed. Second, this technology contains a five-bar linkage which provides an increased mechanical advantage and as well as an additional degree of freedom for improved surgical control. Lastly, this design can incorporate a wide variety of interchangeable tips to reduce the number of tools necessary in a surgical suite. These three design features can be incorporated entirely independent of one another and can each be independently incorporated into existing reduction forcep architectures.  

Advantages

  • Continuous and discrete adjustment
  • Increased mechanical advantage
  • Additional degree of freedom
  • Interchangeable tips reduce cost and variety of tools needed to supply a surgical suite