Lithotripsy apparatus using a flexible endoscope

A method, comprising:

• manipulating a deflection section at a distal tip of an endoscope toward a stone within the body;
• inserting a lithotripsy shaft and a stone retrieval device into a proximal end of a working channel of the endoscope, the lithotripsy shaft and the stone retrieval device configured to extend through the working channel and the deflection section;
• extending the stone retrieval device from a distal tip of the deflection section through the lithotripsy shaft;
• capturing a stone with the stone retrieval device and bringing the stone substantially in line with a longitudinal axis of a substantially straight or slightly curved portion of the deflection section;
• withdrawing the stone retrieval device within the substantially straight or slightly curved shaft of the lithotripsy shaft through a plurality of guide protrusions at a distal tip of the lithotripsy shaft, wherein the plurality of guide protrusions facilitate passage of wires or filaments of the stone retrieval device there through;
• extending the lithotripsy shaft toward the stone;
• and
• driving the lithotripsy shaft under power with a lithotripsy shaft driver toward the stone to break it up with force.