Ivc filter retrieval systems with releasable capture feature

Abstract

Funnel-trap type devices or systems made of braid are described for capture and retrieval or, instead, capture and subsequent release of Inferior Vena Cava (IVC) filters or other medical devices. Delivery and/or retrieval devices, kits in which they are included, methods of use and methods of manufacture are all contemplated.

1 . A system for a vascular medical device retrieval, the system comprising:
 an elongate shaft having a flexible distal extension, the extension folded-back inwardly at a distal opening to form a flap and a more proximal opening;   wherein the proximal opening is sized to receive and pass an enlarged end of a medical device therethrough,   wherein the apparatus is adapted so the enlarged end of the medical device is securable in a pocket within the distal extension, and   wherein the system is adapted for reversing the flap from being positioned inwardly to positioned outwardly for releasing the enlarged end of the medical device.   
     
     
         2 . The system of  claim 1 , wherein the distal extension comprises braid. 
     
     
         3 . The system of  claim 2 , wherein the braid comprises Nitinol, has with between 72 and 288 end count, and incorporates axial fibers. 
     
     
         4 . The system of  claim 2 , wherein at least an inner surface of the flap is coated to secure the braid against intrusion of a hooked portion of the enlarged end of the implant. 
     
     
         5 . The system of  claim 4 , wherein the coating comprises urethane. 
     
     
         6 . The system of  claim 1 , further comprising an elongate sleeve. 
     
     
         7 . The system of  claim 6 , wherein the elongate sleeve is a catheter. 
     
     
         8 . The system of  claim 6 , wherein the apparatus is adapted so the enlarged end of the medical device is secured in the pocket within the distal extension when the elongate sleeve is advanced over the distal extension. 
     
     
         9 . The system of  claim 1 , further comprising the medical device. 
     
     
         10 . The system of  claim 9 , wherein the enlarged end comprises a hook. 
     
     
         11 . The system of  claim 1 , wherein the adaptation for reversing the flap is a pusher received within a lumen of the shaft. 
     
     
         12 . The system of  claim 11 , wherein the pusher comprises a wire attached to the folded-back extension. 
     
     
         13 . The system of  claim 11 , wherein the pusher comprises a plunger comprising a sleeve and an expandable distal section. 
     
     
         14 . The system of  claim 13 , wherein the plunger further comprises a pull wire received within the sleeve and connected at a distal end for expanding the distal section. 
     
     
         15 . The system of  claim 14 , wherein the expandable distal section comprises braid.