Position Tracking System Map Shifting Correction
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Solution Overview
Problem
Map shifting during medical procedures, such as cardiac ablation, occurs due to patient movement or metallic object interference, leading to inaccurate catheter positioning and prolonged procedure times, as existing systems lack effective detection and correction mechanisms.
Innovation Solution
A system comprising external chest and back position sensors that detect discrepancies in measured and predefined positions, alerting the user and enabling real-time correction by calculating geometrical centers and displaying distance values to adjust patient posture or system positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position tracking is performed during medical procedures, then catheter positioning capability is improved, but map shifting occurs due to patient movement or metallic interference causing positioning inaccuracy
Solution Approach 1:
The system continuously monitors the positions of chest and back sensors, compares measured positions with predefined positions, and provides real-time feedback through alerts when map shifting is detected. This closed-loop feedback mechanism enables detection and correction of positioning drift, maintaining measurement precision despite patient movement or metallic interference
Solution Approach 2:
External sensors attached to the patient's chest and back serve as intermediary reference points that are not affected by metallic interference inside the body. These intermediaries provide stable positional references that enable accurate tracking despite the presence of metallic objects or patient movement
2Measurement precision
If map shifting detection and correction mechanisms are implemented, then position tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The system divides the monitoring function into separate chest sensors and back sensors, each independently tracking their respective positions. This segmentation allows the system to detect differential movement between chest and back, enabling map shifting detection without requiring a complex centralized sensing system
Solution Approach 2:
The system uses the patient's own body geometry and the relative positions of chest and back sensors as self-referencing markers. By comparing the measured positions against predefined anatomical relationships, the system performs self-validation and detection of map shifting without requiring external calibration or complex reference systems
3Measurement precision
If real-time position monitoring is performed, then positioning precision is improved, but procedure time increases due to lack of correction mechanisms
Solution Approach 1:
Real-time feedback through alerts immediately notifies operators of map shifting conditions, enabling prompt correction actions. This eliminates the need for lengthy post-procedure verification and allows continuous accurate tracking throughout the procedure, reducing overall procedure time while maintaining precision
Solution Approach 2:
The system performs preliminary detection of map shifting conditions through continuous monitoring and comparison of sensor positions. By detecting and alerting to positioning drift before it significantly impacts catheter placement accuracy, the system prevents the need for time-consuming repositioning and verification procedures
Data Source
AI summary
A system includes a processor and an output device. The processor is configured to: (a) receive electrical signals indicative of measured positions of (i) one or more chest position sensors attached externally to a chest of a patient, and (ii) one or more back position sensors attached externally to a back of the patient; (b) compare between (i) a first shift between the measured positions and respective predefined positions of the one or more chest position sensors, and (ii) a second shift between the measured positions and respective predefined positions of the one or more back position sensors; and (c) produce an alert in response to detecting a discrepancy between the first and second shifts. The output device is configured to output the alert to a user.