Customized Haptic Boundaries for Precise Knee Bone Resection
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Solution Overview
Problem
Computer-assisted surgery systems face limitations in customizing haptic boundaries for prosthetic implant placement, particularly when the patient's anatomy does not precisely match available prosthetic components, leading to potential under- or over-resection of bone tissue during knee replacement surgeries.
Innovation Solution
A method for customizing haptic boundaries based on patient-specific anatomy by identifying a standard haptic boundary associated with a virtual implant model, determining anatomic features at the intersection with the patient's anatomy, and modifying the boundary to generate a customized haptic boundary that accommodates the patient's unique anatomy, allowing for precise bone resection and prosthetic implant placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard haptic boundary based on virtual implant model geometry is used, then the surgical process is simplified and standardized, but the boundary does not precisely match patient-specific anatomy leading to under- or over-resection
Solution Approach 1:
The patent applies local quality by transitioning from a uniform standard haptic boundary to a customized boundary that adapts to local anatomical variations. The system identifies patient-specific anatomic features (landmarks, contours, curvature) and modifies the haptic boundary locally at these features while maintaining the overall standardized structure. This allows the boundary to precisely follow the patient's unique anatomy at critical locations while preserving the benefits of standardization in other areas.
Solution Approach 2:
The patent implements parameter changes by adjusting the geometric parameters of the haptic boundary based on patient-specific measurements. The system modifies boundary parameters such as position, orientation, curvature radius, and contour shape to match the patient's anatomy. These parameter adjustments are made while maintaining the fundamental standardized boundary structure, thus balancing customization needs with process standardization.
2Manufacturing precision
If the haptic boundary is customized to match patient-specific anatomy, then bone resection precision is improved, but the surgical process complexity increases
Solution Approach 1:
The patent applies preliminary action by performing boundary customization during the pre-operative planning phase rather than during the actual surgery. The system uses pre-operative imaging data (CT scans, MRI) to create a virtual model of the patient's anatomy and customize the haptic boundary in advance. This preliminary customization eliminates the need for complex real-time adjustments during surgery, reducing operational complexity while maintaining high precision.
Solution Approach 2:
The patent uses copying by creating a virtual copy of the patient's anatomy from pre-operative imaging data. This virtual anatomical model serves as a template for generating the customized haptic boundary. The system copies relevant anatomical features (landmarks, surfaces, contours) into the virtual environment where the boundary can be precisely defined without affecting the actual surgical workflow complexity.
3Ease of manufacture
If a finite number of standard prosthetic implant components are available, then inventory management is simplified, but the anatomy-implant match is imprecise requiring surgical plan modifications
Solution Approach 1:
The patent replaces the mechanical trial-and-fit process with a virtual simulation system. Instead of physically trying different implant sizes and configurations, the system uses virtual implant models in the pre-operative planning software to precisely match the patient's anatomy. The customized haptic boundary is generated based on the optimal virtual implant fit, eliminating the need for physical trial components and reducing the impact of having有限的 standard implant sizes.
Data Source
AI summary
A method includes providing a boundary defining a portion of a bone to be resected, determining a position of a tracked probe, obtaining a customized boundary by changing a shape of the boundary based on the position of the tracked probe, and guiding operation of a cutting tool in an area defined by the customized boundary.