Patient-Specific Maxilla Bone Cut Configuration for Symmetric Distraction
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Solution Overview
Problem
Transverse maxillary distraction procedures often result in asymmetric correction of maxillary deficiencies due to local variations in maxillary bone stiffness, leading to aesthetically undesirable outcomes.
Innovation Solution
A computer-implemented method generates patient-specific numeric models of the maxilla to determine optimized bone cut configurations that compensate for asymmetric mechanical properties, using iterative calculations and optimization parameters to balance stiffness and reaction forces, thereby ensuring symmetric distraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard symmetric bone cuts are performed on both sides of the maxilla, then the surgical procedure is simple and quick to perform, but the distraction results in asymmetric correction due to local variations in bone stiffness
Solution Approach 1:
The patent applies preliminary action by performing computer-based finite element analysis and iterative optimization calculations before the actual surgery. The system pre-calculates asymmetric bone cut configurations that will compensate for predicted asymmetric distraction, allowing the surgeon to implement the optimized cuts with standard surgical tools without needing complex intraoperative adjustment mechanisms
Solution Approach 2:
The patent directly applies asymmetry by determining different bone cut configurations for the left and right sides of the maxilla. The optimization process deliberately creates asymmetric cut parameters (depth, angle, position) to counterbalance the anticipated asymmetric distraction caused by local bone stiffness variations, transforming the problem of asymmetry into a solution
2Manufacturing precision
If patient-specific numeric modeling and iterative optimization are performed, then asymmetric mechanical properties are compensated for and symmetric distraction is achieved, but the computation time and processing requirements increase
Solution Approach 1:
The patent applies partial action by implementing iterative optimization that stops when convergence criteria are met rather than performing exhaustive calculations. The system performs a sufficient number of iterations to achieve clinically acceptable accuracy for bone cut configurations, balancing computational effort with the practical requirements of surgical planning without requiring complete mathematical convergence
Solution Approach 2:
The patent applies parameter changes by optimizing specific bone cut parameters (depth, angle, position) based on patient-specific finite element analysis results. The system adjusts these parameters iteratively to minimize predicted asymmetric distraction, transforming generic symmetric cut plans into customized configurations that account for individual anatomical variations and bone properties
Data Source
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AI summary
A technique for generating a data set that geometrically defines a bone cut configuration for transverse maxillary distraction is described. A computer-implemented method aspect of that technique comprises creating a numeric model of a maxilla based on patient-specific data of the maxilla. The numeric model is representative of mechanic properties of the maxilla. Based on the numeric model thus generated, one or more cut configurations for one or more bone cuts on at least one of a left hand side and a right hand side of the maxilla are determined. Each cut configuration has been determined to compensate for asymmetric mechanic properties of the maxilla. In a further step, a data set indicative of the one or more cut configurations thus determined is generated. The data set may be used to create a surgical template or jig, for a computer-assisted surgery or in connection with a surgical navigation system.