Basket and everting balloon with simplified design and control

Abstract

Disclosed systems, methods, and devices may include a system for removing a kidney stone from a ureter. The system may have an inner shaft extending coaxially within an outer shaft, a stone retention member shaft having a stone retention member and extending coaxially within the inner shaft, a wall protection member coupled to the outer shaft and the inner shaft, and a handle coupled with proximal ends of the outer shaft, the inner shaft, and the stone retention member shaft. The handle may include an eversion mechanism coupled to the inner shaft and configured to actuate the inner shaft, thereby everting the wall protection member to form a pocket adapted to receive a kidney stone. The system may also include a retention member mechanism coupled to the stone retention member shaft and configured to actuate the stone retention member shaft.

1 . A system for removing a kidney stone from a ureter, the system comprising:
 an outer shaft;   an inner shaft extending coaxially within the outer shaft;   a stone retention member shaft having a stone retention member and extending coaxially within the inner shaft;   a wall protection member coupled to the outer shaft and the inner shaft; and   a handle coupled with proximal ends of the outer shaft, the inner shaft, and the stone retention member shaft, the handle comprising:
 an eversion mechanism coupled to the inner shaft and configured to actuate the inner shaft, thereby everting the wall protection member to at least partially envelope the kidney stone and the stone retention member; and 
 a retention member mechanism coupled to the stone retention member shaft and configured to actuate the stone retention member shaft. 
   
     
     
         2 . The system of  claim 1 , further comprising an elongate, flexible camera positioned coaxially within the stone retention member shaft, such that a distal end of the camera is located near a distal end of the inner shaft. 
     
     
         3 . The system of  claim 1 , further comprising a guide wire extending coaxially within the stone retention member shaft. 
     
     
         4 . The system of  claim 1 , further comprising a laser fiber extending coaxially within the stone retention member shaft. 
     
     
         5 . The system of  claim 1 , wherein the wall protection member comprises an expandable balloon, and the handle further comprises a balloon infusion port configured to expand the balloon. 
     
     
         6 . The system of  claim 1 , wherein the wall protection member is coupled to the inner shaft at an attachment point located on an outer circumference of the inner shaft, and wherein the attachment point is proximally spaced from a distal tip of the inner shaft. 
     
     
         7 . The system of  claim 1 , further comprising a friction fit adapted to resist movement of one of the inner shaft or the stone retention member shaft when the other shaft is actuated. 
     
     
         8 . A system for removing a kidney stone from a ureter, the system comprising:
 an outer shaft;   an inner shaft extending coaxially within the outer shaft;   a stone retention member shaft having a stone retention member and extending coaxially within the inner shaft, the stone retention member configured to capture a kidney stone;   a wall protection member coupled to the outer shaft and the inner shaft; and   a handle coupled with proximal ends of the outer shaft, the inner shaft, and the stone retention member shaft, the handle comprising a retention member mechanism coupled to the stone retention member shaft and configured to move the stone retention member shaft,   wherein the wall protection member is configured to evert responsive to axial force of proximal movement of the stone retention member with the kidney stone to at least partially envelope the kidney stone and the stone retention member.   
     
     
         9 . The system of  claim 8 , wherein the stone retention member shaft comprises a solid shaft. 
     
     
         10 . The system of  claim 8 , wherein the retention member mechanism is the only shaft articulation mechanism that the handle comprises. 
     
     
         11 . The system of  claim 8 , wherein the system is configured to capture a kidney stone in the stone retention member, retract the stone retention member, and evert the wall protection member using the retention member mechanism. 
     
     
         12 . The system of  claim 8 , wherein the wall protection member is coupled to the inner shaft at an attachment point located on an outer circumference of the inner shaft, the attachment point proximally spaced from a distal tip of the inner shaft. 
     
     
         13 . The system of  claim 8 , wherein the stone retention member shaft has sufficient axial stiffness to cause eversion of the wall protection member without the stone retention member shaft substantially stretching. 
     
     
         14 . The system of  claim 13 , wherein the stone retention member shaft having sufficient axial stiffness comprises a stainless steel or nitinol wire having a diameter of at least 0.005″ or a stainless steel hypotube having a wall thickness of 0.002″. 
     
     
         15 . The system of  claim 8 , wherein the wall protection member is an expandable balloon and the handle further comprises a balloon infusion port configured to expand the balloon. 
     
     
         16 . The system of  claim 8 , further comprising an eversion mechanism disposed within the handle.