Patient-Specific Tibial Guide with Variable Resection Channel
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Solution Overview
Problem
Current knee arthroplasty techniques lack precision and accuracy in guiding surgical resections and implant placement due to the variability in human anatomy, leading to suboptimal outcomes and potential complications.
Innovation Solution
Patient-specific guides and instruments are designed preoperatively using three-dimensional digital images of the knee joint, allowing for precise alignment and resection guides that conform to individual anatomy, including tibial and femoral guides with variable resection channels and cutting inserts for customized surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard knee arthroplasty techniques are used, then the procedure can be performed with conventional instruments, but precision and accuracy in guiding surgical resections and implant placement deteriorate due to variability in human anatomy
Solution Approach 1:
The surgical guide is divided into multiple components including a base portion that interfaces with the tibial bone and a resection guide portion that guides the cutting instrument. This segmentation allows each component to be optimized for its specific function while collectively addressing anatomical variability through patient-specific design.
Solution Approach 2:
The surgical guide is designed and manufactured preoperatively based on patient-specific imaging data (CT or MRI scans). This preliminary action allows the guide to be customized to the patient's unique anatomy before surgery, ensuring precise alignment and resection without requiring intraoperative adjustment.
2Measurement precision
If patient-specific guides are designed preoperatively based on three-dimensional digital images, then surgical accuracy and implant fit are improved, but device complexity and customization requirements increase
Solution Approach 1:
The surgical guide is created as a physical copy or replica of the patient's unique anatomy based on three-dimensional digital images obtained from CT or MRI scans. This copying process captures the patient's specific anatomical features and translates them into a customized guide that ensures precise surgical execution.
Solution Approach 2:
The design process transforms anatomical parameters from imaging data into guide geometry parameters. By changing the representation from medical images to physical guide dimensions, the system achieves patient-specific precision while using standardized manufacturing processes for the actual guide production.
3Manufacturing precision
If variable width resection channels are used in tibial guides, then guidance precision for vertical resection is improved, but instrument complexity increases
Solution Approach 1:
The resection channel features a variable width profile along its length, with the width changing at specific locations to provide precise guidance for the cutting instrument. This local variation in geometry is designed to match the specific resection requirements of the patient's anatomy while keeping the overall instrument structure relatively simple.
Data Source
AI summary
A patient-specific unicompartmental tibial guide has a patient-specific body with an inner surface. The inner surface is preoperatively configured to nestingly conform and mate in only one position with an anterior portion and a proximal portion of a tibial bone of a specific patient. The tibial guide includes a vertical resection channel having a variable width preoperatively configured for guiding a vertical resection through the proximal portion of the tibial bone.