Heavily calcified coronary arteries present a distinct challenge during percutaneous coronary intervention because dense calcium can prevent a balloon from expanding properly or a stent from fully seating against the vessel wall. Rotational atherectomy coronary treatment, often referred to informally as rotablation, is one vessel-preparation technique developed to address this problem. Rather than replacing balloon angioplasty and stenting, rotational atherectomy is generally used beforehand, on lesions that are unlikely to respond adequately to balloon dilation alone due to extensive calcium buildup. This article explains, at a general level, how rotational atherectomy works and where it fits among other vessel-preparation approaches used in calcified coronary disease.
How Does Rotational Atherectomy Modify Calcified Plaque?
Rotational atherectomy uses a small, high-speed rotating burr, generally coated with an abrasive material, that is advanced over a guidewire to the calcified segment of the artery. As the burr rotates, it abrades and modifies the hardened calcium along the vessel wall, a process commonly described as plaque modification rather than plaque removal in the traditional surgical sense. The goal is not necessarily to eliminate all calcium but to create enough compliance in the vessel wall that a balloon can subsequently expand more uniformly and a stent can be delivered and deployed with better wall apposition. Debris generated during the process is generally cleared through the bloodstream in very small particles, and operators monitor the procedure closely using fluoroscopic and, in many cases, intravascular imaging guidance.
Why Is Vessel Preparation Necessary Before Stenting Calcified Lesions?
When a stent is deployed against a segment of artery that has not been adequately prepared, dense calcium can prevent the stent struts from making full contact with the vessel wall. Underexpansion or malapposition of this kind has been associated in the literature with a higher likelihood of complications such as stent thrombosis or in-stent restenosis. Vessel preparation techniques, including rotational atherectomy, are generally intended to reduce this risk by making the calcified segment more amenable to uniform expansion before a stent is placed. The decision to use rotational atherectomy, as opposed to other preparation methods, depends on factors such as the location, length, and severity of calcification, as well as the specific vessel involved and the judgment of the treating interventional cardiologist.
Where Does Atherectomy Fit Among Other Vessel-Preparation Tools?
Rotational atherectomy is one of several tools available for preparing calcified coronary lesions. Others generally include non-compliant balloons designed to deliver higher inflation pressures, and lithotripsy-type approaches that use pulsatile energy to fracture calcium in a different mechanical manner. None of these approaches is universally preferred, and each has its own set of typical considerations related to lesion morphology, calcium distribution, and vessel tortuosity. Operators generally select among these options, or combine them, based on pre-procedural imaging findings and intraprocedural assessment, rather than defaulting to a single method for every calcified lesion.
The TemREN Rotablator System
INVAMED manufactures the TemREN Rotablator, a rotational atherectomy system described by the manufacturer as using diamond-coated burrs to ablate calcified plaque while aiming to preserve surrounding elastic tissue. According to the manufacturer, the system offers multiple independent burr sizes, customizable rotational speed, and compatibility with 0.014 inch and 0.035 inch guidewires, along with high-powered aspiration for debris management and compatibility with intravascular ultrasound (IVUS) imaging. The manufacturer also describes a Bluetooth-enabled remote control function compatible with Android and iOS devices, and an embedded AI system. While TemREN is featured on INVAMED's peripheral vascular product materials, it is also referenced in relation to heavily calcified coronary lesions. Further detail is available on the TemREN Rotablator product page and on INVAMED's broader coronary artery disease and cardiac interventions category page.
What happens to the plaque debris created during rotablation?
Debris generated by the rotating burr is generally reduced to very small particles that are cleared through the bloodstream, and systems such as the TemREN Rotablator incorporate aspiration features described by the manufacturer to help manage debris during the procedure. Monitoring during the case is used to help assess the vessel's response.
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.