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.

What is claimed is: 
     
         1 . A catheter for removing foreign body in blood vessel, comprising:
 a tube that has a lumen; and   a capturing unit that is provided on a distal end of the tube and that has a contracted state, in which the capturing unit is contracted, and an expanded state, in which the capturing unit is expanded to form a capturing chamber;   wherein the catheter further comprise:   a power transmitting member that is arranged in the lumen and that rotates relative to the tube; and   a cutting unit that is provided on a distal end of the power transmitting member for cutting a foreign substance flowed into the capturing unit;   wherein the capturing chamber has an opening area decreased gradually from a distal end opening of the capturing chamber toward a proximal end opening of the capturing chamber; and   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.   
     
     
         2 . The catheter for removing foreign body in blood vessel according to  claim 1 ,
 wherein the power transmitting member is another tube having a lumen; and   a guide wire is configured to be inserted through the lumen of said another tube.   
     
     
         3 . The catheter for removing foreign body in blood vessel according to  claim 1 ,
 wherein the power transmitting member is another tube having a lumen; and   a guide unit which guides a foreign substance into the capturing chamber is configured to be inserted through the lumen of said another tube.   
     
     
         4 . The catheter for removing foreign body in blood vessel according to  claim 3 ,
 wherein a radiographic marker is provided to check a distance between the guide unit and the cutting unit visually.   
     
     
         5 . The catheter for removing foreign body in blood vessel according to  claim 1 ,
 wherein the cutting unit is a foldable propeller-shaped member.   
     
     
         6 . The catheter for removing foreign body in blood vessel according to  claim 5 ,
 wherein unevenness is formed on an inner surface of the capturing chamber along a circumferential direction thereof.   
     
     
         7 . The catheter for removing foreign body in blood vessel according to  claim 1 ,
 wherein the cutting unit is an expandable meshed member.   
     
     
         8 . The catheter for removing foreign body in blood vessel according to  claim 1 ,
 wherein the power transmitting member is movable relative to the tube only toward a distal end thereof.