A Novel Distal Micromotor-Based Side-Looking Intravascular Ultrasound Transducer

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Cardiovascular Technology

Background:

• Cardiovascular disease is a leading cause of death in China, necessitating early diagnosis.
• Intravascular ultrasound (IVUS) is crucial for visualizing blood vessels.
• Existing side-looking IVUS (SL-IVUS) systems suffer from nonuniform rotation distortion (NURD) in curved vessels.

Purpose of the Study:

• To develop an improved SL-IVUS catheter to overcome NURD.
• To enhance the accuracy and safety of intravascular imaging.
• To facilitate early diagnosis of cardiovascular diseases.

Main Methods:

• A novel catheter design incorporating a distal motor and sodium chloride (NaCl) solution.
• Directly coupling the micromotor to the transducer using NaCl solution for rotation.
• Evaluating the performance of the single transducer element (center frequency, bandwidth).

Main Results:

• The single element achieved a center frequency of 47 MHz and a -6-dB fractional bandwidth of 98%.
• The SL-IVUS catheter demonstrated speed stability and high resolution.
• The new structure effectively reduces catheter tip dimensions.

Conclusions:

• The novel SL-IVUS catheter design minimizes image distortion caused by vessel curvature.
• This technology offers improved speed stability and resolution for intravascular imaging.
• The reduced catheter size enhances clinical safety and diagnostic potential for cardiovascular disease.