Customized Haptic Boundaries for Knee Implant Bone Preparation
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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 procedures.
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 unique anatomy and surgical tool geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard haptic boundary is used based on available prosthetic implant components, then the surgical process is simplified and standardized, but the boundary may not precisely match the patient's unique anatomy leading to under- or over-resection of bone tissue
Solution Approach 1:
The patent applies local quality by transitioning from a uniform standard haptic boundary to a customized boundary that adapts to specific local anatomical features of the patient's bone. The system modifies the haptic boundary at specific locations based on detected anatomical landmarks, ensuring precise fit for each patient's unique geometry while maintaining the overall standardized surgical workflow.
2Manufacturing precision
If the haptic boundary is customized to precisely match patient anatomy, then bone resection precision is improved, but the surgical planning and boundary definition process becomes more complex and time-consuming
Solution Approach 1:
The system applies self-service by enabling automatic detection of anatomical features from patient imaging data and autonomous generation of customized haptic boundaries based on detected landmarks. This automation reduces the manual effort and complexity involved in customizing boundaries, allowing the system to adapt to patient anatomy without requiring extensive manual intervention from surgeons.
Solution Approach 2:
The patent applies preliminary action by performing automated anatomical feature detection and boundary customization during the pre-operative planning phase. This advance preparation allows the customized haptic boundary to be ready before surgery begins, eliminating the need for complex real-time adjustments during the surgical procedure and reducing intraoperative time requirements.
3Adaptability or versatility
If a finite selection of prosthetic implant components is used, then inventory management and surgical preparation are simplified, but the ability to precisely match patient anatomy is limited
Solution Approach 1:
The patent applies parameter changes by modifying the haptic boundary parameters based on detected anatomical features rather than changing the physical implant components. The system adjusts virtual boundary parameters such as position, orientation, and shape to match patient anatomy, allowing precise anatomical adaptation while working within the constraints of available standardized implant inventories.
Data Source
AI summary
A method for customizing an interactive control boundary based on a patient-specific anatomy includes obtaining a standard control boundary and determining an intersection between a reference feature associated with the standard control boundary and a virtual representation of an anatomy of the patient. The method further includes identifying an anatomic perimeter at the intersection between the identified reference feature and the virtual representation of the anatomy. An anatomic feature on the virtual representation of the anatomy is determined from the intersection of the reference feature and the virtual representation of the anatomy. The standard control boundary is modified based on at least one anatomic feature to generate a customized control boundary.