Steerable sphincterotome and methods for cannulation, papillotomy and sphincterotomy
View Patent ↗The present invention relates to methodology of and apparatus for accurately positioning devices for performing endoscopic cannulation, papillotomy and sphincterotomy and similar procedures. The sphincterotome with a steerable or adjustable distal segment of the present invention allows the physician to control the position of the distal tip of the device independently of the endoscope and adjust for inconsistencies in the device and the anatomy. According to one embodiment of the present invention, a threaded portion of a cable assembly cooperates with a torque transmission element and a cog to enable the operator to rotate a cutting wire into a desired position relative to the catheter. Alternate embodiments allow the operator to fix the depth of a needle knife while allowing, if desired, accurate rotational positioning of the associated catheter. Threaded stabilizing elements, pivot elements and a steering wire may be used together or individually to accomplish these features. Presently available products that may be modified according to the present invention include, but are not limited to, Boston Scientific Sphincterotomes and Needle Knives.
1. A multi-lumen, multi-functional endoscopic catheter comprising:
a first lumen disposed in said catheter;
at least one positionable cutting device
disposed in said first lumen to be positioned along said first lumen and also out of a distal end of said first lumen
a reciprocating cable disposed in said first lumen to position said cutting device;
at least one transmission element disposed in said first lumen at a distal portion of said catheter, said transmission element being disposed about said cable;
said cable having a helical exterior shaped surface portion that is in moveable contact with a helical interior shaped surface portion of said transmission element so that when a proximal portion of said cable is reciprocally moved a combination of rotational and reciprocal movements are made between said cable and said transmission element as said cable helical exterior shaped surface portion is moved with respect to said transmission element helical interior shaped surface portion; and,
said transmission element having an exterior shaped surface disposed in contact with an interior shaped surface of said first lumen for transmitting rotary motion to the distal end of said catheter from said transmission element.
2. The catheter of claim 1 further comprising an expansible balloon at the distal end of a second lumen, said second lumen open at the distal end of said catheter to the interior of said balloon and open at the proximal end of said catheter to an entrance port.
3. The catheter of claim 1 further comprising:
a second lumen for receiving a guidewire.
4. The catheter of claim 1 further comprising:
a bendable cutting wire energized by radio-frequency energy.
5. The catheter of claim 1 , wherein said catheter is insertable in a duodenoscope.
6. The catheter of claim 1 , wherein said transmission element completely encircles said cable.
7. The catheter of claim 1 , wherein said transmission element is fixed to the inner surface of said first lumen.
8. The catheter of claim 1 , further comprising:
a cog located in said first lumen and having an exterior shaped surface that is the same as the interior shaped surface of said first lumen, said cog capable of reciprocal movement within said first lumen.
9. The catheter of claim 1 , wherein resistance between said transmission element and said cable is varied to change the proportion of reciprocating motion transmitted to rotary motion.
10. The catheter of claim 1 , further comprising:
a cog located in said first lumen and having an exterior shaped surface that is different from the interior shaped surface of said first lumen said cog capable of reciprocal movement within said first lumen.