A medical device configured for large stone extraction comprising:
- a flexible elongate catheter comprising a plurality of lumens, a proximal end and a distal end, a longitudinal axis extending from said proximal end to said distal end, an electrosurgical wire assembly that has a distal cutting part for performing a sphincterotomy and a non-conductive part that extends proximally through a first lumen towards the proximal end to be attached to a heat source and a handle that controls tip deflection/manipulation, wherein a distal tip of the catheter is curved towards the first lumen such that a distal end of the electrosurgical cutting wire is attached to the distal tip, and wherein the first lumen terminates proximal to the distal tip such that the cutting part is exposed within a recess defined by the curvature of the distal tip and the end of the first lumen;
- a second lumen extending from the distal end to the proximal end, configured to accept a contrast injection through the proximal end for cholangiography or similar uses;
- a third lumen extending from the distal end to the proximal end, configured to accept a guidewire, wherein the lumen may be constructed without a split for the catheter to operate as a long-wire catheter or alternatively may be configured to have a splitable channel in the form of a C, U, O configuration or other similar channels for use as a short-wire catheter;
- a low-compliance, high-pressure dilator balloon located on the catheter towards the distal end, configured for dilation of an ampulla of Vater or a stricture, wherein the dilator balloon is filled via infusion of a fluid through a fourth lumen that extends proximally from one or more dilator balloon entry ports to the proximal end of the catheter, with a luer lock or another compatible connector at the proximal end to be attached to a pressure gauge and an inflation device, configured to be dilated to one fixed diameter or several different predetermined diameters dependent on the pressure level achieved;
- a second low-pressure, high-compliance extractor balloon located distal of the dilator balloon on the catheter for extraction/retrieval of stones or other objects, wherein the extractor balloon is filled through a fifth lumen that extends proximally from one or more extractor balloon entry ports to the proximal end of the catheter with a connector for a syringe, configured to be inflated to one fixed or several different predetermined diameters based on a volume of air introduced through a syringe;
- an additional side-hole, optionally incorporated near the distal end of the third lumen for the catheter to have additional guidewire exchange capability as an ultra-short wire exchange catheter;
- and
- one or more radiopaque markers, optionally incorporated to mark certain areas of the catheter, with or without color coded visual markers at various locations as desired.