Surgical Instrument Guide for Knee Gap Consistency
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Solution Overview
Problem
In artificial knee joint replacement techniques, achieving a consistent gap between the tibial proximal portion and the femur distal portion in both flexed and extended positions is challenging due to variations in bone resection.
Innovation Solution
A surgical instrument with a body portion and a posterior condyle abutment portion, featuring abutment surfaces and slits to guide bone resection instruments for additional resection of the femur, allowing for adjustment between the extended and flexed position gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional osteotomy and re-resection methods are used, then the basic bone resection is completed, but the gap consistency between extended and flexed positions cannot be achieved
Solution Approach 1:
The guide body is pre-configured with multiple abutment surfaces (first abutment surface for distal end resection surface, second abutment surface for posterior condyle resection surface) and multiple slits (first slit, second slit, third slit) that enable preliminary positioning and guidance for subsequent resection operations. This preliminary setup ensures that the bone resection instrument will automatically follow the correct trajectory to achieve consistent gaps in both extended and flexed positions.
Solution Approach 2:
The guide body is divided into functionally distinct segments: the body portion with first abutment surface and first/second slits for distal resection guidance, and the posterior condyle abutment portion with second abutment surface and third slit for posterior condyle resection guidance. This segmentation allows each portion to independently guide specific resection operations while maintaining overall coordination for gap consistency.
2Manufacturing precision
If multiple resection operations are performed sequentially, then comprehensive bone resection is achieved, but the surgical time and procedural complexity increase
Solution Approach 1:
The guide body serves multiple functions simultaneously: it guides the bone resection instrument for distal resection through the first slit, guides posterior condyle resection through the third slit, and provides positioning references through multiple abutment surfaces. This multi-functionality allows comprehensive bone resection to be achieved through a unified guiding system rather than separate positioning operations for each resection step.
Solution Approach 2:
The guide body is positioned and fixed to the femur before any resection operations begin, establishing all necessary guidance trajectories in advance. The multiple slits are pre-configured to guide the bone resection instrument through the exact paths needed for both distal and posterior condyle resections, eliminating the need for repeated positioning and setup during the surgical procedure.
3Stability of the object's composition
If the guide body is fixed with fixing pins, then stable positioning is achieved, but the risk of pin insertion errors and additional fixation time increases
Solution Approach 1:
The positioning function and fixation function are merged into the abutment surfaces themselves. The first abutment surface and second abutment surface provide both the positioning reference and the fixation interface simultaneously. When these surfaces are brought into close contact with their corresponding bone surfaces (distal end resection surface and posterior condyle resection surface), they establish stable positioning without requiring separate fixation elements.
Data Source
AI summary
An object of the present disclosure is to provide a surgical instrument that can facilitate adjustment between a progressive position gap and a flexed position gap by additionally resecting a bone after resection of a femur distal portion. A surgical instrument (1) includes a body portion (2) including a first abutment surface (5) abuttable against a distal end resection surface (102) of a femur distal portion (101) and a posterior condyle abutment portion (3) including a second abutment surface (10) abuttable against a posterior condyle resection surface (104) of a posterior condyle portion (103) of a femur (100) and connected to the body portion (2). The body portion (2) includes a first slit (7) extending in a direction parallel to the second abutment surface (10) and a second slit (8) extending in a direction intersecting the first abutment surface (5) and the second abutment surface (10).