Reference Catheter Dislodgement Detection in Medical Localization
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Solution Overview
Problem
The navigational reference in medical device localization systems can become dislodged due to mechanical or perceived movements, leading to invalid position measurements, and it is challenging to distinguish between actual and false dislodgements.
Innovation Solution
A method that computes slow- and fast-moving average locations of reference localization elements, compares distances and angles to thresholds, and generates signals to detect dislodgement, providing guidance for repositioning or adjusting measurements to account for changes in the reference catheter's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a catheter-mounted reference localization element is inserted into the heart to establish the origin of the coordinate system, then the navigational reference is positioned proximate to the mapping catheter for improved measurement accuracy, but the reference catheter becomes vulnerable to dislodgement due to collision, entanglement, or inadvertent jostling
Solution Approach 1:
The system continuously monitors the position of the reference localization element by comparing slow-moving and fast-moving average locations. When displacement exceeds a threshold, the system generates a dislodgement alert, providing real-time feedback to the operator about reference catheter stability
Solution Approach 2:
The reference localization element acts as an intermediary between the reference catheter and the localization system. By tracking the position of this element, the system can detect catheter dislodgement without directly monitoring the catheter itself, enabling indirect but effective monitoring of reference stability
2Measurement precision
If the navigational reference is used to measure mapping catheter positions, then accurate localization is achieved, but any dislodgement of the reference invalidates all subsequent position measurements
Solution Approach 1:
The system establishes slow-moving and fast-moving average locations of the reference localization element before normal measurement operations begin. This preliminary setup creates a baseline reference state that enables detection of future dislodgements and protects the validity of subsequent measurements
3Reliability
If the system monitors reference catheter position continuously, then dislodgement can be detected promptly, but the complexity of the localization system increases due to additional computing and monitoring requirements
Solution Approach 1:
The system computes both slow-moving and fast-moving average locations of the reference localization element, which is more computation than strictly necessary. This excessive action provides redundant information that improves dislodgement detection reliability while maintaining simple implementation
Data Source
AI summary
A method of detecting dislodgement of a navigational reference for a localization system includes securing a reference catheter, including at least one reference localization element, at an initial reference location within a localization field. The positions of one or more of the reference localization elements are monitored for a perceived displacement that suggests that the reference catheter has become dislodged from the initial reference location (e.g., a displacement above a certain threshold, such as about 4 mm). The direction of this perceived displacement may then be further analyzed (e.g., compared to a predicted or most likely direction of displacement) to determine whether there has been an actual dislodgement of the reference catheter, and, if so, an appropriate signal (e.g., an audible or visual warning) may be generated. Upon dislodgement, guidance may be provided to aid the practitioner in restoring the reference catheter to its initial location.