Gaining bloodless field in minimally invasive mitral valve surgery is crucial for a successful surgery. We here demonstrate a simple method to obtain bloodless field in minimally invasive mitral valve surgery with only single venous cannula through the femoral vein. A dual-stage venous cannula is inserted through the femoral vein, with its tip located deep in superior vena cava. After establishing full flow, the inferior vena cava (IVC) was snared. Returning blood from the IVC was blocked at the snare, and drained through the side holes at the midportion of the cannula. This technique collapsed the right atrium, and made the left atrium almost bloodless. Pressures of the femoral vein measured in 28 patients were 9.5 ± 4.1 mmHg before bypass, 6.8 ± 4.8 mmHg before snaring IVC, and 7.2 ± 4.8 mmHg after snaring. By blocking returning blood from the lower body, venous congestion of the lower body did not occur.

在微创二尖瓣手术中获得无血视野对于手术成功至关重要。我们在这里展示了一种简单的方法，可以在微创二尖瓣手术中通过股静脉仅使用单根静脉插管获得无血场。双级静脉插管通过股静脉插入，其尖端位于上腔静脉深处。建立全流量后，下腔静脉 (IVC) 被圈套。从 IVC 返回的血液在圈套器处被阻塞，并通过套管中部的侧孔排出。这种技术使右心房塌陷，使左心房几乎不流血。28 名患者测量的股静脉压力在搭桥前为 9.5 ± 4.1 mmHg，在圈套 IVC 前为 6.8 ± 4.8 mmHg，在圈套后为 7.2 ± 4.8 mmHg。