Metatarsal Osteotomy Guide Block for Minimally Invasive Bunion Correction
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Solution Overview
Problem
Current bunion correction surgeries are invasive, painful, and result in significant scarring and prolonged recovery due to the lack of precision in bone cuts made through small incisions, leading to potential soft tissue damage and variable outcomes.
Innovation Solution
A minimally invasive method involving the use of a guide block and cutting tools like broaches or saws to create osteotomies in the metatarsal, followed by the insertion of an implant with a monolithic body and anchor, secured by a suture to realign the great toe, reducing incision size and tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional invasive bunion correction surgery is performed with large incisions, then complete bone exposure and access are achieved, but patient discomfort, scarring, and recovery time increase significantly
Solution Approach 1:
The implant is divided into separate components: a proximal portion with a head, a shaft, and a distal anchor portion. This segmentation allows the implant to be inserted through a small incision while providing sufficient bone engagement and soft tissue attachment points, thereby reducing incision size and associated harm while maintaining surgical reliability
Solution Approach 2:
A guide block is introduced as an intermediary tool to facilitate the osteotomy and implant insertion process. The guide block contains guide holes that align cutting instruments and define the osteotomy location, enabling precise bone cutting through minimal incisions without compromising the reliability of the correction procedure
2Object-affected harmful factors
If bone cuts are made through small incisions using burrs and drill bits, then incision size is reduced, but precision and repeatability of bone cuts deteriorate
Solution Approach 1:
The guide block serves as a precision intermediary that contains guide holes specifically positioned to receive cutting instruments. This guide block ensures accurate osteotomy location and angle while allowing access through a small incision, thereby maintaining bone cut precision without increasing incision size
Solution Approach 2:
The guide block is positioned and secured to the bone before performing the osteotomy. This preliminary positioning establishes precise reference points and alignment guides that ensure accurate bone cutting trajectories, making the subsequent cutting operation repeatable and precise despite the limited access through a small incision
3Device complexity
If blind insertion of burrs and drill bits is performed, then procedure simplicity is maintained, but adjacent soft tissue damage and unrepeatable results increase
Solution Approach 1:
The guide block acts as a protective intermediary that guides cutting instruments along predetermined safe paths. This guide structure prevents accidental deviation into adjacent soft tissues while maintaining relatively simple procedure steps, thereby reducing soft tissue damage without significantly increasing procedural complexity
Solution Approach 2:
The guide block provides tactile and visual feedback to the surgeon during the osteotomy process. The guide holes and guide surfaces give real-time information about the correct cutting trajectory and depth, allowing the surgeon to avoid soft tissue structures while maintaining procedural simplicity and reducing damage
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 first portion, securing a suture to the joint capsule, tensioning the suture to align the great toe with the metatarsal, attaching the suture to the nail, and fastening the nail to the second portion. A first guide block includes a plurality of coplanar passages to guide an instrument to create one or more holes in the metatarsal in advance of the osteotomy, and a second guide block includes a guide slot for another instrument to complete the osteotomy. The method can be performed through an incision of 0.5 inches or less. The nail includes an anchor portion for anchoring in the first portion, a head for attachment to a second portion, and can include a passage for attachment of the suture.