Bunion Correction System Using K-Wire Guided Osteotomy
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Solution Overview
Problem
Current bunion correction surgeries are invasive, painful, and result in significant scarring and prolonged recovery, with potential soft tissue damage and variable outcomes due to blind use of burrs and drill bits through small incisions.
Innovation Solution
A minimally invasive method involving targeted incisions, k-wire guided instruments, and implants with specific geometries to resect metatarsal bones and insert corrective implants, reducing tissue damage and enhancing repeatability, using a broach to create osteotomies and a pocket for implant placement, along with sutures to realign the great toe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional invasive bunion correction surgery is performed with burrs and drill bits inserted blindly through small incisions, then bone cuts can be made, but soft tissue damage occurs and results become unrepeatable
Solution Approach 1:
The patent introduces surgical guides as intermediary devices that mediate between the surgeon's intent and the bone cutting process. These guides include guide pins inserted into the metatarsal bone and guide blocks or templates that attach to the guide pins, providing a mechanical framework that directs the burr or drill bit along precise predetermined paths. This intermediary system eliminates blind insertion and protects soft tissue by physically constraining the cutting instruments to safe trajectories.
Solution Approach 2:
The patent replaces the traditional blind mechanical insertion of burrs and drill bits with a guided mechanical system. Instead of directly inserting cutting tools through small incisions without guidance, the system substitutes a guided approach using guide pins, guide blocks, and templates that mechanically constrain the cutting instruments. This substitution transforms the uncontrolled mechanical action into a precisely controlled process, reducing soft tissue damage while maintaining the ability to make necessary bone cuts.
2Ease of manufacture
If traditional invasive bunion correction surgery is performed with several inch incisions, then bone cuts can be made, but recovery time extends to 10-12 weeks
Solution Approach 1:
The patent segments the surgical approach into minimally invasive components: small incisions (contrasting with traditional several-inch incisions), guide pins inserted through the bone, guide blocks or templates attached to the guide pins, and burrs or drill bits inserted through small openings guided by the framework. This segmentation allows bone cuts to be made through minimal tissue disruption, significantly reducing the incision size and consequently the recovery time from 10-12 weeks to a much shorter period.
3Device complexity
If blind insertion of burrs and drill bits is used through small incisions, then the procedure can be performed with minimal incisions, but results become unrepeatable from patient to patient
Solution Approach 1:
The patent applies preliminary action by first inserting guide pins into the metatarsal bone at predetermined locations, then attaching guide blocks or templates to these guide pins before making any bone cuts. This preliminary setup establishes a precise reference framework that ensures consistent, repeatable results across different patients. The guide system is prepared in advance with predetermined geometries and orientations that guarantee reproducible bone cutting paths, eliminating the variability inherent in blind insertion methods.
4Object-affected harmful factors
If minimally invasive surgery is performed with small incisions, then scarring and discomfort are reduced, but creating bone cuts becomes unrepeatable and causes soft tissue damage
Solution Approach 1:
The patent uses surgical guides as intermediary devices that enable minimally invasive procedures to achieve reliable, repeatable results. The guide pins, guide blocks, and templates serve as intermediaries that translate the surgeon's minimally invasive approach into precise bone cutting without compromising repeatability. These intermediaries protect soft tissue while ensuring consistent outcomes, resolving the contradiction between minimally invasive technique and surgical reliability.
Data Source
AI summary
A minimally invasive method of correcting a bunion includes performing an osteotomy to divide the metatarsal into first and second portions, implanting a nail in the second portion, and securing the nail to the first portion using a k-wire and cannulated screw inserted through an aperture in the nail head.