Computer-Assisted Bone Cutting Guide for Press-Fit Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bone preparation methods for orthopedic implants lack flexibility and precision in adjusting the degree of press-fit interference based on varying bone quality, leading to inconsistent implant fixation and potential long-term failure.
Innovation Solution
A computer-assisted surgical system that generates a bone model intra-operatively, allows for the selection of optimal implant positioning, and adjusts cutting guide configurations to achieve desired levels of interference fit, enabling customization of bone cuts based on real-time bone quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed cutting block is used for bone preparation, then the bone cuts can be made efficiently with standard procedures, but the degree of press-fit interference cannot be adjusted to match varying bone quality
Solution Approach 1:
The cutting block is designed with adjustable components that allow dynamic repositioning of cutting surfaces relative to the implant. The system enables real-time modification of cut positions and angles to accommodate varying bone density and quality, transforming a static tool into a dynamic adaptation system that maintains productivity while improving versatility.
Solution Approach 2:
The system allows change in critical parameters including cut depth, cut angle, and cut position offset from the implant surface. By enabling continuous adjustment of these parameters, the system can optimize press-fit interference levels for different bone qualities while maintaining efficient surgical workflow.
2Ease of manufacture
If the same cutting block is used for all patients, then the surgical procedure is simplified and standardized, but the press-fit interference cannot be customized for individual bone quality
Solution Approach 1:
The cutting block is divided into modular, independently adjustable components. Each cutting surface can be positioned and angled independently relative to the implant, allowing precise control over the degree of press-fit interference for each specific bone quality while maintaining overall procedural standardization through a unified system architecture.
Solution Approach 2:
The system incorporates pre-configured adjustment mechanisms and guides that are set up before the surgical procedure. These preliminary configurations allow for precise, repeatable adjustments during surgery without requiring complex real-time calculations, maintaining procedural standardization while enabling customized precision for each patient's bone quality.
3Device complexity
If manual cutting blocks are used with fixed cutting planes, then the device complexity is reduced, but the ability to adjust bone cuts intra-operatively is limited
Solution Approach 1:
The cutting block incorporates mechanical adjustment mechanisms that allow intra-operative repositioning of cutting surfaces. These dynamic adjustments can be made with minimal added complexity, enabling the surgeon to adapt cut parameters to bone quality changes during the procedure while maintaining a relatively simple overall device structure.
Solution Approach 2:
The system introduces an intermediary adjustment mechanism between the fixed reference frame and the cutting surfaces. This intermediary component provides a simple yet effective means of intra-operative adjustment, allowing the cutting block to adapt to varying bone qualities without significantly increasing overall device complexity.
Data Source
AI summary
A computer assisted surgical system for guiding bone cutting operations of an arthroplasty surgery is provided. The computer assisted surgical system includes a cutting guide having a guiding surface for mounting to a bone and a computer. The computer is in communication with the cutting guide and configured to generate a bone model of the first bone without the use of pre-operative bone images, determine a position of an implant model having a bone interface surface on the bone model, determine a position of the cutting guide on the first bone based on the determined position of the implant model on the bone model, and position the guiding surface of the cutting guide to one of a plurality of predetermined cut configurations relative to the bone interface surface.