Polymer Cutting Block with Metallic Bushings for Joint Replacement
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Solution Overview
Problem
Current orthopaedic surgical instruments lack a single, efficient tool capable of performing multiple precise cuts during joint replacement surgeries, such as knee replacements, which can lead to increased procedural complexity and variability in surgical outcomes.
Innovation Solution
A polymer 4-in-1 femoral cutting block with integrated metallic cutting guides and bushings, allowing for anterior, posterior, and chamfer cuts, providing a single-use, multi-functional instrument that secures metallic components to guide saws and drills, preventing contact with polymeric materials and ensuring precise resections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple separate cutting instruments are used for different cuts, then each cut can be performed with a dedicated tool, but the procedural complexity increases and surgical efficiency decreases
Solution Approach 1:
The patent combines multiple separate cutting guides (anterior, posterior, and two chamfer cutting guides) into a single integrated polymer cutting block. This consolidation allows all four cuts to be performed using one instrument rather than multiple separate tools, directly reducing procedural complexity while maintaining the ability to perform each cut with its dedicated guide surface.
Solution Approach 2:
The polymer cutting block is designed as a multi-functional instrument that can perform four distinct cutting operations (anterior cut, posterior cut, and two chamfer cuts) through its multiple integrated cutting guides. Each guide is positioned and oriented to facilitate a specific cut type, enabling a single instrument to replace multiple specialized tools and thereby improving surgical efficiency.
2Reliability
If metallic cutting guides are used without protective bushings, then the guides can directly contact bone for precise cutting, but the polymeric materials of the cutting block are at risk of damage from saw contact
Solution Approach 1:
Metallic bushings are positioned at the medial and lateral ends of the cutting guides, serving as intermediary protective elements. These bushings prevent direct contact between the saw blade and the polymeric cutting block, thereby protecting the polymer from damage while the metallic cutting guides maintain their direct contact with bone for precise cutting guidance.
Solution Approach 2:
The cutting block employs a composite construction combining polymeric material for the block body with metallic components (cutting guides and bushings). This composite approach leverages the advantages of both materials: the polymer provides a disposable, comfortable interface with bone, while the metallic bushings provide durability and protection against saw contact, ensuring both protection and precision.
3Reliability
If a single-use cutting block is used, then instrument sterilization and cross-contamination risks are eliminated, but the cost per procedure increases compared to reusable instruments
Solution Approach 1:
The cutting block is designed as a single-use disposable instrument made from polymeric materials. This eliminates the need for sterilization processes and prevents cross-contamination between patients, ensuring reliable sterility assurance. The disposable nature means the entire block is discarded after one use, which increases material consumption but eliminates reprocessing costs and sterilization infrastructure requirements.
Data Source
AI summary
An orthopaedic surgical instrument includes a polymer cutting block having a number of metallic cutting guides secured thereto. A pair of metallic bushings function as saw stops at the medial and lateral ends of the cutting slot during an orthopaedic surgical procedure.