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

[0034]According to the catheter for removing foreign body in blood vessel of the present invention as described in (1), because 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 and also, 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 of the capturing chamber, a foreign substance, such as thrombus, can be guided from the distal end opening having a large opening area in the capturing chamber toward the proximal end opening having a small opening area, and thus can be effectively condensed in the proximal end opening. Also, by cutting the foreign substance, which has been condensed in the proximal end opening of the capturing chamber, by the cutting unit, the foreign substance can be effectively nodulized. Therefore, a large foreign substance, which would not be previously sucked into a catheter, can be also nodulized to be effectively sucked and removed. In addition, because the cutting unit is arranged more toward the proximal end opening of the capturing chamber than the distal end opening of the capturing chamber, the cutting unit is not exposed in a blood vessel upon cutting, thereby ensuring safety.

[0035]According to the catheter for removing foreign body in blood vessel of the present invention as described in (2), because the power transmitting member is another tube having a lumen, through which a guide wire can be inserted, the catheter can be directed by the guide wire to be reliably guided to a site, where the foreign substance is generated.

[0036]According to the catheter for removing foreign body in blood vessel of the present invention as described in (3), because the power transmitting member is another tube having a lumen, through which a guide unit for guiding a foreign substance into the capturing chamber can be inserted, the foreign substance can be effectively guided and condensed into the capturing chamber by the guide unit.

[0037]According to the catheter for removing foreign body in blood vessel of the present invention as described in (4), because a radiographic marker is provided to allow a distance between the guide unit and the cutting unit to be seen by eyes, contact between the cutting unit and a balloon can be prevented, thereby avoiding damage of the guide unit by the cutting unit.

[0038]According to the catheter for removing foreign body in blood vessel of the present invention as described in (5), because the cutting unit is a foldable propeller-shaped member, even a large foreign substance can be sucked and removed by reliably cutting and nodulizing the foreign substance by the propeller-shaped member.

[0039]According to the catheter for removing foreign body in blood vessel of the present invention as described in (6), because unevenness is formed on an inner surface of the capturing chamber along a circumferential direction thereof, the foreign substance can be ground and crushed by the unevenness formed on the inner surface of the capturing chamber and the propeller-shaped member, thereby effectively nodulizing the foreign substance.

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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