Abstract
This research studies the temperature of calcified plaque grinding inside the human artery via rotational atherectomy (RA), a catheter-based clinical procedure. Experiments were conducted based on a bovine bone made plaque surrogate and PVC arterial phantom. The temperature rise of the bone surrogate and the saline flows into the blood from the device were measured. The results showed that the bone and saline temperature rise increased at the higher wheel rotational speed. The heated saline may induce thermal damage to the blood at the clinically recommended wheel speeds (135,000–175,000 rpm) and the tissue around the grinding site at the rotational speed higher than 155,000 rpm. To understand the two heat sources during RA: grinding and catheter friction, an inverse heat transfer method with a one-dimensional finite element model was utilized. It was found that the grinding-induced bone temperature rise is minimal (less than 0.5 °C at 0.2 mm away from the bone inner surface), about 8% of that induced by the catheter friction. Precooling and increasing flow rate of the saline were experimentally proved to be a feasible way to reduce the temperature rise and avoid thermal damage in plaque grinding by RA.
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