Femoral Cut Guide with Detachable Box for Precise Bone Resection
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Solution Overview
Problem
Current knee arthroplasty procedures face challenges in accurately preparing the distal femur to receive prosthetic femoral components, particularly in replicating the complex anatomical features and ligament stabilization mechanisms of the natural knee joint, which can lead to suboptimal fit and function of prosthetic components.
Innovation Solution
A femoral cut guide is designed to replicate the size and shape of the prosthetic femoral component, including a detachable box cut guide that guides a cutting tool to remove bone and accommodate the prosthetic's central box, allowing for precise resection and testing of the knee joint before implantation, thereby ensuring accurate alignment and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional bone resection methods are used, then the surgical procedure is simpler, but the precision of distal femur preparation and prosthetic component fit is reduced
Solution Approach 1:
The cut guide system is divided into multiple independent components: a base guide for initial resection and a detachable box cut guide for box preparation. This segmentation allows each component to be optimized for its specific function while maintaining overall system precision without excessive complexity.
Solution Approach 2:
The base guide performs preliminary bone resection to create a prepared surface before the box cut guide is attached. This preliminary action establishes a reference plane that ensures subsequent box preparation is precisely positioned, achieving high manufacturing precision through staged preparation.
2Reliability
If multiple trial components are used for testing, then the fit can be verified, but the surgical time and number of components increase
Solution Approach 1:
The box cut guide is designed as a precise replica of the actual prosthetic box interface. By using this copy during surgery, the surgeon can verify fit and alignment without requiring multiple trial components, reducing surgical time while maintaining reliability of fit verification.
Solution Approach 2:
The box cut guide serves multiple functions: it guides box preparation, verifies box fit, and confirms alignment. This multi-functionality consolidates what would traditionally require separate trial components into a single tool, reducing both time and component count while maintaining verification reliability.
3Manufacturing precision
If the box cut guide is permanently attached, then positioning accuracy is maintained, but intraoperative adjustments become difficult
Solution Approach 1:
The box cut guide employs a detachable attachment mechanism that allows it to be securely fixed during box preparation for precision, then easily removed or repositioned if adjustments are needed. This dynamic capability enables both accurate positioning and intraoperative adaptability without compromise.
Solution Approach 2:
The attachment mechanism acts as an intermediary between the box cut guide and base guide, providing secure connection during critical positioning while allowing easy detachment for adjustments. This intermediary enables the system to transition between stable and adaptable states as needed during surgery.
Data Source
AI summary
The present disclosure provides a femoral cut guide for preparing a distal femur to receive a prosthetic femoral component of a knee implant. The prosthetic femoral component includes a central box. The femoral cut guide replicates the size and shape of the prosthetic femoral component, such that the femoral cut guide may serve as a trial or provisional component used to reduce and test the prepared knee joint before implanting the final prosthetic femoral component. The femoral cut guide includes a detachable box cut guide for preparing the distal femur to receive the central box of the prosthetic femoral component.