Clinical experience with a novel thermosensitive temporary coronary artery occluder (LeGoo)

A bloodless field is important for visualizing relevant anatomical structures and facilitating construction of high-quality coronary anastomoses during off-pump coronary artery bypass graft surgery (OPCABG). Currently employed devices can damage target arteries as well as myocardium and are not uniformly effective, especially with diseased arteries.

LeGoo (Pluromed, Woburn, MA) is a thermosensitive polymer that is a viscous liquid at room temperatures and changes into a firm occlusive plug instantaneously when exposed to body temperatures. The polymer is nontoxic and neither metabolized nor absorbed. It dissolves spontaneously or can be dissolved at will by cooling. LeGoo was instilled through the arteriotomy of 99 coronaries in 50 patients during construction of OPCABG anastomoses.

LeGoo formed an occlusive endoluminal plug instantaneously and blocked blood flow into the surgical field. In 89 vessels with available information, the quality of bloodless field was satisfactory, without need for substantial use of blood removal systems or application of another device in 81 vessels (91%). Resort to other means was prompted by serious arrhythmia (1 case) epicardial bleeding (1 vessel), bleeding from collateral branches (3 vessels), and shortcomings in design of the injecting catheter (3 vessels) that has been corrected. Intraoperative and perioperative profiles of these patients were similar to those reported from other OPCABG series. Abnormal bleeding, coagulopathy, metabolic derangements, and evidence of LeGoo embolization were not observed.

In this first large-scale human experience, LeGoo had been an atraumatic, safe, and effective temporary coronary artery occluder. It produced a bloodless field during OPCABG in 91% of target vessels. Improvements on these results with further experience is anticipated.