Pelvic Navigation System for Acetabular Angle Measurement
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Solution Overview
Problem
Current methods for determining the angle of anteversion and inclination of the acetabulum during acetabulum implantation are complex and expose patients to high radiation doses, particularly in X-ray examinations.
Innovation Solution
A method involving the non-invasive determination of specific pelvic bone points, such as the spina iliaca anterior superior, spina iliaca posterior superior, and symphysis pubis, to calculate the angles of anteversion and inclination using predetermined rotational axes, eliminating the need for invasive X-ray examinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray examinations are used to determine the angle of anteversion and inclination, then measurement precision is improved, but the patient is exposed to high radiation doses
Solution Approach 1:
The patent replaces the X-ray imaging system with a mechanical navigation system that uses electromagnetic fields and sensors to track the positions of pelvic landmarks and calculate angular measurements, thereby eliminating radiation exposure while maintaining measurement capability
Solution Approach 2:
The patent introduces electromagnetic fields and navigation sensors as intermediaries between the pelvic bone structures and the measurement system, allowing indirect determination of angular positions without direct X-ray exposure to the patient
2Measurement precision
If complicated preliminary examinations are carried out to determine angular position, then measurement precision is improved, but device complexity and examination time increase
Solution Approach 1:
The patent extracts only the essential pelvic landmarks (anterior superior iliac spine, posterior superior iliac spine, symphysis pubis) needed for angular calculation, eliminating the need for comprehensive X-ray imaging of the entire pelvic structure and simplifying the examination system
Solution Approach 2:
The patent creates a virtual model of the pelvic bone structure based on the positions of key landmarks detected by the navigation system, allowing angular measurements to be calculated from this simplified digital representation rather than requiring complex physical imaging
Data Source
AI summary
In a method for determining the angle of anteversion and/or the angle of inclination of an acetabulum in a pelvic bone, in order to achieve a simplification, a method is proposed, wherein prominent points on the pelvic bone are non-invasively determined, these prominent points are joined by an individual plane, and this individual plane is respectively rotated through predetermined, specific angular magnitudes for the angle of inclination and the angle of anteversion, respectively, and the angle between the rotated individual plane and a main plane of the pelvic bone is determined in order to determine the angle of inclination and the angle of anteversion.