Basket and everting balloon with simplified design and control
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 method for removing a kidney stone from a ureter, the method comprising:
advancing a distal end of an elongate, flexible kidney stone removal device into the ureter to a location near the kidney stone;
advancing, using a retention member slider on a handle of the kidney stone removal device, a retention member shaft of an expandable stone retention member through an inner shaft of the kidney stone removal device to expose an expandable, stone retention portion of the stone retention member out of a distal end of the inner shaft;
trapping the kidney stone in the stone retention portion of the stone retention member;
retracting an eversion slider on the handle to evert a distal portion of a wall protection member attached to the distal end of the kidney stone removal device to form a pocket in the wall protection member, wherein the eversion slider is coupled to the retention member slider, such that retracting the eversion slider automatically retracts the retention member slider and thus also retracts
the stone retention portion with the trapped kidney stone into the pocket formed in the wall protection member; and
removing the kidney stone removal device from the ureter while the stone retention member and the kidney stone are at least partially within the pocket in the wall protection member.
2. The method of claim 1 , wherein the eversion slider is coupled to the retention member slider via a friction fit, and wherein the eversion slider is held in position by a lock, such that the retention member mechanism can be moved without moving the eversion slider.
3. The method of claim 2 , wherein, when the eversion slider is unlocked and moved, relative to the handle, it automatically moves the retention member slider.
4. The method of claim 1 , wherein the wall protection member comprises an inflatable balloon, and wherein the handle of the kidney stone removal device comprises a port in fluid communication with an inflation lumen configured to deliver inflation fluid to the balloon.
5. The method of claim 4 , further comprising inflating the balloon, wherein the balloon partially deflates when the distal portion of the wall protection member everts.
6. The method of claim 4 , further comprising inflating the balloon to dilate a portion of the ureter.
7. The method of claim 1 , wherein retracting the eversion slider comprises retracting the inner shaft, which is coupled to the wall protection member.
8. The method of claim 1 , wherein advancing the distal end of the kidney stone removal device comprises advancing the distal end through a lumen of a ureteroscope.
9. The method of claim 1 , wherein everting the distal portion of the wall protection member to form the pocket is caused, in part, by the trapped kidney stone being retracted back into the inner shaft.