Patellofemoral Resection Guide Tool with Intersecting Burr and Saw Openings
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Solution Overview
Problem
Conventional methods for resecting the distal femur to accommodate a femoral resurfacing prosthesis lack precision due to the complexity of the bone surface, making it difficult to achieve a perfect fit between the resected bone and the prosthesis, especially in the patellofemoral joint, where free-hand techniques are inadequate and highly surgically demanding.
Innovation Solution
A guide tool with aligned burr and saw guide openings that intersect to create a complex resection surface, featuring a plate with angled saw guide openings, a condylar shelf, lugs for controlled positioning, and fixation openings to ensure accurate alignment and fixation, allowing for precise resection and drilling of peg holes for the prosthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If free hand resection methods are used with templates and osteotomes, then the surgical procedure can be performed with simple tools, but the manufacturing precision of the resected bone surface is insufficient to match the complex three-dimensional prosthesis surface
Solution Approach 1:
A guide tool acts as an intermediary device between the surgeon and the bone resection process. The guide tool includes a body with multiple guide openings that direct cutting instruments, ensuring the resected bone surface precisely matches the complex three-dimensional prosthesis geometry without requiring the surgeon to manually replicate such complexity
Solution Approach 2:
The guide tool is positioned and fixed to the bone surface before resection begins. The guide openings are pre-configured with locating features that align with anatomical landmarks, establishing the correct resection geometry in advance before any cutting occurs, thereby ensuring accuracy throughout the procedure
2Productivity
If free hand bone removal is performed to create a complex resection surface, then the procedure can be completed without specialized equipment, but the surgical difficulty and time required increase significantly
Solution Approach 1:
The guide tool serves as a mediator that simplifies the surgical operation by providing pre-configured guide openings for saws and burs. These guide openings automatically direct cutting instruments along the correct paths and at the correct angles, reducing surgical difficulty while maintaining high resection efficiency
Solution Approach 2:
The guide tool body is divided into multiple guide openings that can accommodate different cutting instruments (saws, burs, drills) for different stages of resection. This segmentation allows each cutting operation to be performed independently through its own guide opening, simplifying the overall surgical process while maintaining efficiency
Data Source
AI summary
A guide tool (100) for guiding resection of a bone piece, comprising a body (102), a burr guide opening (130) extending through the body (102) and defining a burr resection surface, and a saw guide opening (120) extending through the body (102) and defining a saw resection surface, the burr guide opening (130) and the saw guide opening (120) being aligned such that the burr resection surface and the saw resection surface intersect, defining a bone piece resection surface.