Patient-Specific Haptic Boundaries for Precise Knee Bone Resection
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Solution Overview
Problem
Current computer-assisted surgery systems face challenges in customizing haptic boundaries for knee replacement procedures, as they often require surgeons to select undersized prosthetic implants, leading to potential damage to healthy tissue or incomplete resection of diseased tissue, due to the limitations of standard haptic boundaries based on implant geometry rather than patient-specific anatomy.
Innovation Solution
The method involves customizing virtual haptic boundaries by determining the intersection between a reference feature of the virtual implant model and the patient's anatomy, allowing for precise adjustment of the boundary to accommodate the size and shape of the cutting tool and preserve healthy tissue, thereby minimizing the risk of under- or over-resection during knee replacement surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed haptic boundary based on implant geometry is used, then the system is simple and easy to operate, but it cannot accommodate patient-specific anatomy variations and may lead to damage to healthy tissue or incomplete resection of diseased tissue
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing multiple haptic boundary definitions corresponding to different implant sizes and configurations before surgery. During surgery, the appropriate pre-defined boundary is selected and applied based on the specific implant choice, eliminating the need for complex real-time boundary generation while achieving patient-specific customization.
Solution Approach 2:
The haptic boundary is made dynamic by allowing it to change based on implant selection. The system automatically adjusts the haptic boundary parameters (size, shape, position) to match the selected implant characteristics, enabling the boundary to adapt dynamically during the surgical planning and execution phases without requiring complex manual reconfiguration.
2Manufacturing precision
If an undersized prosthetic implant is selected, then the implant fits within the standard haptic boundary, but healthy tissue may be damaged or diseased tissue may not be completely resected
Solution Approach 1:
The system implements feedback by continuously monitoring the relationship between the selected implant size and the defined haptic boundary. The boundary is automatically adjusted to provide appropriate clearance around the implant while maintaining precise alignment with anatomical landmarks, ensuring that resection boundaries are optimally positioned to remove diseased tissue while preserving healthy tissue based on real-time implant selection feedback.
Solution Approach 2:
The system applies parameter changes by modifying the haptic boundary parameters (dimensions, position, orientation) based on the selected implant characteristics and patient-specific anatomical measurements. This allows the boundary to be precisely tuned for each case, ensuring optimal resection margins that accommodate the specific implant size while protecting healthy tissue.
Data Source
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AI summary
A method for generating a customized haptic boundary based on a patient-specific anatomy includes identifying a standard haptic boundary based on a geometry of a virtual implant model to be implanted on the anatomy. The method also includes identifying a reference feature associated with a virtual implant model and determining an intersection between the identified reference feature and a virtual model associated with an anatomy of the patient. An anatomic perimeter at the intersection between the identified reference feature and the virtual model of the anatomy is identified and an one anatomic feature is determined on the virtual model of the anatomy. The standard haptic boundary is modified based on the anatomic feature to generate a customized haptic boundary.