Drill Guide Alignment Confirmation for Knee Arthroplasty
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Solution Overview
Problem
Current orthopedic procedures for knee arthroplasty face challenges in accurately confirming the alignment of patient-specific alignment guides relative to the mechanical axis of the knee joint before drilling holes in the bone, which can lead to inefficiencies and potential misalignment during surgical procedures.
Innovation Solution
A drill guide system that includes coupling members and an alignment confirmation feature, allowing for intraoperative confirmation of the alignment of patient-specific alignment guides relative to the bone's mechanical axis, ensuring precise alignment before drilling, and featuring a main body with through-holes and projections that guide drilling tools and confirm alignment using a rod or laser pointer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If patient-specific alignment guides are used for knee arthroplasty, then alignment precision is improved, but the complexity of confirming alignment increases
Solution Approach 1:
A laser pointer is introduced as an intermediary tool to visually indicate the mechanical axis of the bone. The laser pointer aligns with the drill guide's alignment confirmation feature, providing a clear visual reference that simplifies the alignment verification process without compromising precision.
Solution Approach 2:
The patent replaces complex mechanical alignment confirmation mechanisms with an optical system (laser pointer). Instead of relying solely on mechanical interfaces and physical measurements, the laser provides immediate visual feedback about alignment status, reducing the complexity of the confirmation process.
2Reliability
If alignment confirmation features are added to drill guides, then alignment reliability is improved, but device complexity increases
Solution Approach 1:
The drill guide is segmented into distinct functional components: coupling members for attaching to the alignment guide, drill openings for guiding drilling tools, and alignment confirmation features for verifying alignment. This modular design allows each component to perform its specific function reliably while keeping the overall device manageable.
Solution Approach 2:
The alignment confirmation feature serves multiple purposes: it provides a reference for laser alignment, ensures proper positioning of the drill guide relative to the bone, and verifies the correctness of the alignment guide placement. This multi-functionality increases reliability without proportionally increasing complexity.
3Reliability
If multiple coupling members are used to attach drill guide to alignment guide, then connection reliability is improved, but device complexity increases
Solution Approach 1:
Each coupling member is designed with specific local features (protrusions, recesses, threading) that ensure reliable attachment at its specific location. The coupling members are distributed at strategic positions on the drill guide and alignment guide to maximize connection reliability while minimizing overall structural complexity.
Data Source
AI summary
An orthopedic device includes a drill guide configured to be mounted on a patient-specific alignment guide for intraoperatively confirming alignment of the patient-specific alignment guide relative to a bone. The patient-specific alignment guide includes first and second referencing holes. The drill guide includes a main body with a first coupling member and a second coupling member. The first and second coupling members are configured to be received within the first and second referencing holes, respectively. The first and second coupling members each include corresponding first and second drill openings configured to align with the first and second referencing holes, respectively. The drill openings each guide a drilling tool toward the bone to drill corresponding holes in the bone. The main body also includes an alignment confirmation feature configured for confirming alignment of the patient-specific alignment guide relative to the bone before drilling holes in the bone.