Patient-Specific Bone Cutting Guide for Osteotomy
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Solution Overview
Problem
Current osteotomy procedures face challenges with non-patient-specific cutting guides, which can be difficult to position and secure accurately, leading to improper cuts and risks of complications in correcting bone conditions such as bunions.
Innovation Solution
The development of patient-specific cutting guides and implants, generated from CT scan data and CAD models, that match the unique anatomy of each patient, allowing for precise resection and reorientation of bones during osteotomy procedures like bunion correction, Evans calcaneal osteotomy, and medializing calcaneal osteotomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-patient-specific cutting guides are used, then the surgical procedure can be performed with standard instrumentation, but the cutting guide is difficult to position and secure accurately, leading to improper cuts and surgical risks
Solution Approach 1:
Patient-specific cutting guides are designed and fabricated before surgery based on preoperative imaging data (CT or MRI scans). The guides incorporate patient-specific anatomical surface contours that are created in advance, allowing the surgeon to simply attach the guide to the prepared bone surface without complex positioning procedures during surgery.
Solution Approach 2:
The cutting guide incorporates a bone engagement surface that is a precise copy or replica of the patient's actual bone surface geometry. This copying approach ensures that the guide matches the unique anatomical features of the individual patient's bone, enabling accurate positioning and secure attachment while maintaining standard surgical procedures.
2Reliability
If non-patient-specific cutting guides are used, then standard instrumentation can be utilized, but the guides are difficult to secure at the desired position and may move away before osteotomy
Solution Approach 1:
The cutting guide features localized engagement surfaces and attachment mechanisms positioned at specific locations on the guide body. These local features include bone engagement surfaces with specific geometries that match particular anatomical landmarks, and attachment features positioned to secure the guide to stable bone regions, ensuring reliability without requiring complex overall device design.
3Manufacturing precision
If patient-specific cutting guides are designed and fabricated, then precise resection and reorientation of bones can be achieved, but additional time is required for customization and fabrication
Solution Approach 1:
All design and fabrication activities for patient-specific cutting guides are completed during the preoperative planning phase, allowing sufficient time for customization without impacting surgical time. The guides are manufactured before the patient arrives for surgery, so the actual surgical procedure benefits from having precision instruments ready without time pressure.
Solution Approach 2:
The cutting guide design incorporates adjustable parameters and modular components that can be customized based on patient-specific measurements from imaging data. By varying geometric parameters such as engagement surface contours, attachment feature locations, and guide geometry, precise fits are achieved without requiring complete redesign of entire guide systems.
Data Source
AI summary
A method may be used to correct a condition present in a patient. The method may include obtaining a first bone model of a first bone of one or more bones of the patient's foot, and using at least the first bone model to generate a cutting guide model. The cutting guide model may define a first bone engagement surface shaped to match a first contour on the first bone, and a first guide feature that, with the first bone engagement surface overlying the first contour, is positioned to guide resection of the one or more bones as part of a surgical osteotomy for correcting the condition. The surgical procedure may be selected from a first group consisting of a bunion correction osteotomy, an Evans calcaneal osteotomy, and a medializing calcaneal osteotomy. The first bone may be selected from a second group consisting a metatarsus, a cuneiform, and a calcaneus.