Magnetic Distortion Detection in Medical Localization Systems
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Solution Overview
Problem
Magnetic localization systems for medical instruments are prone to errors due to magnetic field distortions caused by metallic or ferrous objects, leading to inaccurate positioning of catheters within the body.
Innovation Solution
A system comprising sensor coils and processor circuitry that detects magnetic field distortions by calculating time-dependent magnetic field magnitude values and comparing them to threshold shifts, allowing for the identification and correction of distortions that affect catheter localization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic localization systems are used to position catheters within the body, then precise positioning capability is improved, but accuracy deteriorates due to magnetic field distortions from metallic objects
Solution Approach 1:
A magnetic distortion sensor acts as an intermediary device that measures magnetic field distortions caused by metallic objects. The sensor provides correction data that compensates for the distortions, allowing the magnetic localization system to maintain accurate catheter positioning despite the presence of ferrous objects in the magnetic field
Solution Approach 2:
The system continuously monitors magnetic field distortions using the magnetic distortion sensor and feeds this information back to correct the localization calculations. This feedback mechanism enables real-time compensation for distortions, maintaining localization accuracy even when metallic objects are introduced into the field
2Measurement precision
If magnetic distortion detection is implemented, then localization accuracy is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The magnetic distortion sensor serves multiple functions: it detects the presence of metallic objects, measures the magnitude and direction of magnetic field distortions, and provides correction data for localization calculations. This multi-functionality reduces the need for separate systems and minimizes overall device complexity while maintaining high localization accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively identifies and corrects for magnetic field distortions, enhancing the accuracy of catheter positioning and reducing procedural errors by distinguishing between actual and perceived catheter locations within the patient's body.
Implementation Method 1
Each of the sensor coils senses the magnetic field aligned with the orientation of the sensor and outputs an electrical signal indicative of the sensed magnetic field
Data Source
AI summary
A method for detecting and correcting for magnetic field distortions within a magnetic field used for medical magnetic localization systems may include a first set of one or more signals is indicative of the magnetic field sensed by each of the sensor coils within the metal distortion detection fixture at a first time received from the metal distortion detection fixture. A first magnitude value of the combined signals is determined. A second set of one or more signals is indicative of the magnetic field sensed by each of the sensor coils at a second time is received and a second magnitude value of the combined signals is determined. A magnetic shift in the magnetic field between the first and second magnitude values is determined. The magnetic shift is compared to a threshold shift amount indicative of a magnetic distortion in the magnetic field.