Patient-Specific Resection Guide Mount for Accurate Bone Alignment
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Solution Overview
Problem
Existing methods for total joint replacement surgeries, such as total knee, hip, or ankle replacement, lack the ability to generate patient-specific prostheses, surgical instruments, guides, and fixtures accurately, leading to misalignment and potential discomfort or degradation of the prosthesis.
Innovation Solution
A method is developed to create anatomically accurate digital models of bones using CT or MRI scans, which are then used to manufacture custom surgical instruments, guides, and fixtures. These custom-made guides include a bone engagement portion with a complementary surface topography and a receptacle pocket for a resection guide, allowing for precise alignment and attachment during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cutting guides with intramedullary stems are used, then the guides can be positioned during surgery, but manual alignment is required which reduces positioning accuracy
Solution Approach 1:
Patient-specific alignment features are pre-formed on the bone surface through imaging and digital planning before surgery. The custom guide incorporates complementary alignment features that mate with these pre-formed features, eliminating the need for manual alignment during surgery and ensuring precise positioning.
Solution Approach 2:
The invention creates a digital copy of the patient's unique bone surface topography through CT or MRI imaging. This digital model is used to design custom guides with alignment features that precisely match the patient's anatomy, replacing the need for manual alignment with pre-programmed geometric correspondence.
2Adaptability or versatility
If generic cutting guides are used, then device complexity is reduced, but patient-specific anatomical variations cannot be accommodated leading to misalignment
Solution Approach 1:
The invention applies local quality by creating patient-specific alignment features only where needed on the bone surface, rather than requiring complete customization of entire guide structures. The custom guides incorporate localized complementary features that match specific anatomical landmarks, providing anatomical adaptability while maintaining reasonable device complexity.
3Measurement precision
If multiple external fixtures are used for alignment, then positioning accuracy can be maintained, but the number of components and surgical steps increases
Solution Approach 1:
The invention merges the alignment function and the cutting guide function into a single integrated patient-specific guide structure. The custom guide incorporates alignment features directly into its design, eliminating the need for separate external fixtures and reducing the number of components and surgical steps while maintaining positioning accuracy.
Solution Approach 2:
The patient-specific custom guides serve multiple functions: they provide anatomical alignment through pre-formed surface features, guide cutting blade positioning, and ensure proper orientation relative to the mechanical axis of the limb. This multi-functionality replaces multiple separate alignment fixtures with a single versatile device.
Data Source
AI summary
A system for making a resection of a bone having localized anatomical surface features prior to resection, comprising: a resection guide locator including a body, the body including opposing medial and lateral wings extending outwardly from the body, the body defining a recess being a socket defined by an annular wall, the annular wall including an upper wall, a lower wall, a resection guide having a body defining a resection slot, at least a portion of the resection guide body sized and configured to be received within the recess defined by the resection guide locator.