11.   In angioplasty, a balloon-tip catheter is threaded into the artery to open it.

12.   Speaking in a strong voice and chuckling occasionally, Cheney told King that he watched as doctors threaded a catheter into his thigh.

13.   The experimental catheters are threaded from the groin up to the inferior vena cava, the big vein that runs down the center of the abdomen.

14.   When doctors threaded the catheter into his artery to zap the clot, he was watching on a monitor.