Properties of ultrasonically marked leads

Area of Science:

• Biomedical Engineering
• Medical Devices
• Diagnostic Systems

Background:

• Cardiac pacing leads require accurate placement and monitoring.
• Existing methods for lead assessment may involve significant radiation exposure.
• Electrophysiological studies of catheters necessitate precise localization.

Purpose of the Study:

• To evaluate the accuracy and usability of a novel ultrasonic marking system for cardiac pacing leads.
• To assess the system's performance in measuring implanted lead function.
• To investigate potential electrical shock and ultrasonic hazards associated with the system.

Main Methods:

• Development of an ultrasonic marking system with adjustable sensitivity.
• Quantitative measurements of system accuracy and sensitivity trade-offs.
• Electrical safety testing, including energy and current measurements.
• Ultrasound intensity measurements against safety standards.
• Testing the system for early detection of pacing lead failure.

Main Results:

• System accuracy is inversely related to sensitivity during implantation; reduced sensitivity improves accuracy.
• Transponder circuits suit general use, while passive circuits are optimal for multi-electrode studies.
• Electrical safety tests confirmed minimal energy release (<10(-9) J) and low current (<50 microamperes).
• Ultrasound intensities remained within established safety limits.
• The system successfully provided early warnings of pacing lead malfunction.

Conclusions:

• The ultrasonic marking system offers a safe and accurate method for cardiac pacing lead implantation and monitoring.
• Adjustable sensitivity allows optimization for different procedural phases.
• The system enhances patient follow-up accuracy and significantly reduces X-ray exposure.
• It provides a valuable tool for early detection of lead malfunction, improving patient care.