Intussuscepting balloon catheter for stone extraction

摘要

An extraction device for removing foreign bodies such as a uretal stone from a human body passage. A double lumen catheter is provided having a tubular balloon attached circumjacent to the distal end thereof. A suction lumen is open at the distal end and a pressure applying lumen is open to the interior of the balloon. The balloon includes a lower reentrant portion. After insertion of the distal end of the catheter into the body passage such as the ureter to the point of a stone, the balloon is inflated dilating the ureter. The catheter is slowly withdrawn causing intussusception of the distal end of the tubular balloon, thereby surrounding and captivating the stone. Continued withdrawal extracts the stone without trauma to the passage wall.