New percutaneous transluminal coronary angioscope

Area of Science:

• Cardiovascular Medicine
• Medical Imaging
• Biomedical Engineering

Background:

• Coronary artery disease diagnosis relies heavily on coronary arteriography.
• Direct visualization of coronary artery lumens can provide complementary pathophysiological information.
• Existing angioscopic technologies may have limitations in maneuverability and visualization quality.

Purpose of the Study:

• To develop and evaluate a novel percutaneous transluminal coronary angioscopic catheter for improved coronary artery visualization.
• To assess the feasibility and safety of the new angioscopic catheter in animal and human subjects.
• To determine the clinical utility of angioscopy in identifying coronary artery pathologies beyond conventional arteriography.

Main Methods:

• Development of a new angioscopic catheter with a fixed balloon and angulation mechanism for precise coaxial alignment.
• The catheter features four channels, accommodating a 0.36 mm angioplasty guide wire and irrigation.
• Evaluation in 8 dogs, 11 dogs with induced thrombi, 20 patients with atherosclerotic coronary arteries, and 1 patient undergoing angioplasty.

Main Results:

• The angioscopic catheter was successfully introduced into coronary arteries in all cases using an 8F guide catheter and steerable guide wire.
• Good visualization (complete lumen) was achieved in 46% of human lesions, moderate ( >50%) in 36%, and poor (<50%) in 18%.
• No major complications were reported during the preliminary studies in dogs and humans.

Conclusions:

• The developed angioscopic catheter is feasible for visualizing coronary arteries in closed-chest cardiac catheterization settings.
• Angioscopy provides valuable information on pathophysiological changes in coronary disease, potentially undetected by coronary arteriography.
• This novel angioscope holds promise for enhancing the understanding and diagnosis of coronary artery disease.