Catheter for removing foreign body in blood vessel

Abstract

A capturing unit provided on a distal end of a second tube can be deformed into a contracted state and an expanded state, in which the capturing unit is deployed to form a capturing chamber. The capturing chamber has an opening area decreased as it goes from a distal end opening of the capturing chamber toward a proximal end opening of the capturing chamber. A third tube rotatable relative to the second tube and a cutting unit provided on a distal end of the third tube for cutting a foreign substance are arranged in a second lumen. In the expanded state of the capturing unit, the cutting unit is arranged more toward the proximal end opening of the capturing chamber than the distal end opening.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority from U.S. Provisional Patent Application No. 61 / 911,022 filed on Dec. 3, 2013; the entire contents of which are incorporated herein by reference.TECHNICAL FIELD [0002]The present invention relates to a catheter for removing foreign body in blood vessel, and more particularly, to a catheter for removing foreign body in blood vessel, which captures / crushes a foreign substance, such as thrombus, which embolizes a blood vessel and is adhered on a blood vessel wall, and thus allows the foreign substance to be effectively sucked and removed through the catheter to the outside of the body.BACKGROUND ART[0003]To reperfuse a blood vessel, in which stenosis or occlusion is caused due to atheromatous plaque or thrombus, an occlusion substance within the blood vessel has to be removed. A balloon catheter in which a foreign substance removing filter, such a annular wire or a mesh is stor...

AI Technical Summary

Benefits of technology

The present invention involves a catheter for removing foreign bodies from blood vessels. The catheter has a capturing chamber with a decreasing opening area towards the proximal end, which allows for effective condensation and nodulization of large foreign substances. A cutting unit is arranged at the proximal end opening of the capturing chamber, which ensures safety by preventing exposure of the cutting unit in the blood vessel. A power transmitting member, through which a guide wire or a guide unit can be inserted, ensures reliable guiding of the catheter to the site where the foreign substance is generated. A radiographic marker prevents damage to the guide unit by the cutting unit. The cutting unit is a foldable propeller-shaped member that can suck and remove even large foreign substances with reliability. Unevenness on the inner surface of the capturing chamber and the propeller-shaped member helps to ground and crush the foreign substance, effectively nodulizing it.

Problems solved by technology

Even in the case of the catheter having such a foreign substance removing filter, it is difficult to capture all fragments of atheromatous plaque or thrombus peeled from a blood vessel wall, and in addition, there are problems in that in a case of a large thrombus or the like, the thrombus is clogged in the catheter or does not enter the catheter, or the like.

If such thrombus, which cannot be recovered and is freed, enters a peripheral vascular, there is a risk of causing peripheral vascular occlusion or the like.

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