Patent ID: 7309344

Claim:
A medical device for use with an endoscope in dilating a body lumen, the medical device comprising a generally transparent segment having: a distal tapered tip having a guidewire passageway extending therethrough; a first cylindrical section having an axial length, the first cylindrical section disposed proximally of the distal tapered tip and disposed distally of a first tapered transition portion, the first cylindrical section having a substantially constant first outer diameter sized for providing dilation of a body lumen, and a first channel extending at least partially into said first cylindrical section, wherein the channel has an internal diameter larger than that of the guidewire passageway and wherein the channel is sized for receiving an endoscope, a second cylindrical section disposed proximally of the first tapered transition portion and disposed distally of a second tapered transition, the second cylindrical section having a substantially constant second outer diameter sized for providing dilation of a body lumen, wherein said second outer diameter is larger than said first outer diameter, and a third cylindrical section disposed proximally of the second tapered transition portion, the third cylindrical section having a substantially constant third outer diameter sized for providing dilation of a body lumen, wherein said third outer diameter is larger than said second outer diameter, wherein each of the first, second, and third outer diameters is provided without inflation of the generally transparent segment.