| 摘要 |
A catheter capable of being propelled through blood vessels. The catheter comprises at its distal end a head portion and, proximal thereto, a propulsion compartment. The propulsion compartment comprises an outer tube and an inner tube, the tubes being concentric, wherein one of the inner or outer tubes can slidingly move in relation to the other of the inner or outer tubes in response to a pressure exerted thereon by a fluid introduced into one or both of the tubes. A method for propelling a catheter through the lumen of a body vessel is also disclosed.
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