Hinged Distal Femur Cutting Block for Knee Implant Alignment
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Solution Overview
Problem
Current orthopedic implants for knee replacement surgeries face challenges due to limited sizing options, improper rotation, and inadequate instrumentation, leading to ineffective implant placement and increased surgeon error.
Innovation Solution
A customizable distal femur cutting block with hinged portions and contoured surfaces for precise alignment and cutting guides, allowing for accurate sizing and rotation of femoral implants based on patient-specific CT or MRI scans, reducing the need for multiple blocks and improving surgical precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate cutting blocks are used for different cutting operations, then each block can be optimized for its specific function, but the surgical procedure requires multiple instrument changes and increases operative time
Solution Approach 1:
The patent combines multiple separate cutting blocks (each optimized for specific cutting operations) into a single integrated cutting block with multiple interfaces. This allows the surgeon to perform all necessary cutting operations (distal cut, posterior cuts, lateral cuts) using one block, eliminating the need to remove and replace multiple blocks during surgery, thereby reducing operative time while maintaining functional optimization for each cutting type.
Solution Approach 2:
The cutting block is designed with multiple interfaces (first interface, second interface, third interface) that can accommodate different cutting instruments for various cutting operations. This multi-functional design allows a single block to perform the roles of multiple specialized blocks, providing universal applicability for different cutting needs while maintaining the specific functional optimization for each type of cut.
2Device complexity
If standard-sized implants are used for all patients, then inventory and selection are simplified, but the implant may not be correctly sized for individual patient anatomy
Solution Approach 1:
The cutting block includes a trial implant interface with specific geometric features (condylar radius, anterior-posterior length, medial-lateral width) that can be selected to match the patient's specific anatomy. This allows customization of the implant size and configuration for each patient's local anatomical requirements while maintaining a standardized overall system design.
Solution Approach 2:
The system allows adjustment of key implant parameters (condylar radius, anterior-posterior length, medial-lateral width) by selecting different trial implant configurations. This enables precise sizing of the implant to match the individual patient's anatomy, improving sizing accuracy while maintaining a manageable inventory of standardized components that can be configured to meet specific patient needs.
3Manufacturing precision
If complex instrumentation is used to achieve precise implant rotation and alignment, then implant placement accuracy is improved, but the device complexity and surgeon training requirements increase
Solution Approach 1:
The cutting block is pre-configured with interfaces and guides that establish the correct implant orientation and rotation before the actual implantation. By preparing the bone cuts with precise angular relationships built into the block's geometry, the system ensures proper implant alignment is achieved through the preliminary cutting and positioning steps, reducing the need for complex adjustment mechanisms during final implant placement.
Solution Approach 2:
The cutting block incorporates a trial implant that serves as a physical copy or model of the final implant. This trial implant is positioned and oriented exactly as the final implant will be, allowing the surgeon to verify proper alignment, rotation, and fit before committing to the final implant placement. This simplifies the process by using a replica to guide the precise positioning rather than requiring complex measurement and calculation systems.
Data Source
AI summary
A distal femur cutting block comprising a first portion defining a first external surface, the first external surface including one or more first passages therethrough; and a second portion defining a second external surface, the second external surface including one or more second passages therethrough, the first portion hingedly connected to the second portion, wherein the first portion and the second portion may be rotated relative to each other through the hinged connection; and a third surface opposite one of the first surface or the second surface, the third surface comprising contours configured to substantially mate with at least one condyle of the distal femur.