Or a doctor might use a special tube called a catheter and give the medicine directly into the blood clot.

To insert the stent, the doctor uses another tube called a catheter.

A thin, lighted tube called an arthroscope is placed inside a small cut made near the joint.

He or she uses a thin, flexible tube called a colonoscope to look at the colon.

Usually a small, metal mesh tube called a stent is placed at the same time.

A tube called a "spear" extends from the opening to the other end.

Or the doctor uses a tube called a graft to connect the artery and a vein.

A small tube called a stent often is placed in the artery to hold it open.

The doctor places a thin tube called a catheter into the vein through a small cut in the skin.

You have two small passage from your throat called the Eustachian tubes, one leading into each middle ear.