| 摘要 |
A torqueable, three-dimensionally preformed guide or diagnostic catheter to selectively engage the ostium of a right coronary artery in a human includes: a torque-transmitting proximal shaft that receives manipulation by a user outside a human body in which the catheter is used; and a distal shaft that is responsive to torque transmitted by the proximal shaft. The distal shaft includes a preformed support section having at least a segment that abuts a posterior interior surface of the ascending aorta of the human body. The distal shaft also includes a preformed ostium entry section extending from the support section. In one implementation, the ostium entry section transitions from the support segment abutting the aortic wall to a distal tip end by way of at least two angles which provide smoother transition than a single sharp angle.
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