Patient-Specific Knee Osteotomy Guide for Precise Alignment Correction
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Solution Overview
Problem
Existing tools and procedures for knee osteotomies, particularly high tibial osteotomies, lack accuracy and precision in correcting the alignment of the knee joint, leading to suboptimal pressure distribution between the tibia and femur.
Innovation Solution
A preoperative planning method and surgical kit that includes a patient-specific guide designed using 3D models of the patient's bones to determine the required correction angle and surgical steps, along with a fixation plate and spacing elements to secure the bone alignment, ensuring precise anatomical conformity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing generic tools and procedures are used for knee osteotomies, then the surgical procedure can be performed with standard equipment, but the accuracy and precision of knee alignment correction is insufficient
Solution Approach 1:
The surgical system is divided into generic tools (standard equipment) and a patient-specific guide (custom component). The guide is segmented into multiple functional elements including bone-contacting surfaces, tool-guiding features, and alignment references, allowing each to perform its specific function while maintaining overall system manageability.
Solution Approach 2:
The patient-specific guide is designed and manufactured before surgery based on preoperative 3D imaging and planning. This preliminary action allows the surgical path to be planned in advance, ensuring accurate alignment correction while using simple generic tools during the actual procedure.
2Manufacturing precision
If a patient-specific guide is designed and manufactured, then the accuracy and precision of the surgical procedure is improved, but the device complexity and manufacturing requirements increase
Solution Approach 1:
The patient-specific guide is created as a physical copy or representation of the planned surgical geometry derived from 3D imaging data. The guide replicates the precise alignment and positioning information in a tangible form that can be directly used during surgery, bridging the gap between digital planning and physical execution.
Solution Approach 2:
The design process transforms imaging parameters (3D coordinates, alignment angles, cut depths) into manufacturing parameters for the guide. This parameter transformation allows automated manufacturing processes to produce the complex guide geometry from digital models, reducing manual manufacturing complexity.
3Ease of operation
If generic surgical tools are used without patient-specific guidance, then the surgical procedure is simpler to perform, but the pressure distribution correction between tibia and femur is suboptimal
Solution Approach 1:
The patient-specific guide acts as an intermediary between the simple generic surgical tools and the complex requirement for precise alignment correction. The guide translates the corrective intent into accurate physical positioning, allowing generic tools to achieve precision outcomes without requiring the tools themselves to be complex.
Data Source
AI summary
A surgical kit for performing a bone surgery, the surgical kit comprising an anchor module configured to be secured to a patient's bone with a removable module interface extending outwardly from an operative side of the anchor module; a cutting module configured to be superposable against the patient's bone, the cutting module having a slot extending therethrough along a plane and opening on a cutting module bone interface side and a cutting module operative side, wherein a bone-contacting surface of the anchor module is configured to contact the patient's bone on both sides of the plane; the cutting module being spaced from the anchor module by an open space, with and first and second connecting members connecting the cutting module to the anchor module.