| 摘要 |
A medical device system and method allows an arterial bypass graft to be proximally anastomosed to an aorta during a beating heart CABG procedure without substantial loss of blood by use of an endolumenal aorta isolation assembly provided along the distal end portion of an elongate catheter body. The aorta isolation assembly includes proximal and distal portions that are separated by an intermediate isolation region and that are adjustable to first and second extended positions, respectively, which are adapted to circumferentially engage the aortic wall and isolate upstream and downstream aspects of an exterior space between the elongate body and the aortic wall. Blood flowing within the aorta is thereby isolated from the proximal anastomosis site along the intermediate region and is shunted from an upstream region of the aorta, through the distal port into the flow lumen, proximally along the flow lumen, out from the flow lumen through the proximal port, and into a downstream region of the aorta. The assembly may also be used in a "stopped heart" cardiac bypass procedure, wherein a distal internal valve is coupled to the internal flow lumen along the elongate body between the distal and first proximal ports. A proximal internal valve is coupled to the internal flow lumen along the elongate body between the proximal port and a second proximal port.
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