Steerable kink-resistant sheath
View Patent ↗A steerable kink resistant access device is provided having an elongated body and a steerable portion. The access sheath has an outside diameter sufficiently small so that it may be inserted into a body cavity or conduit. The access sheath typically has two internal lumen, a first lumen sized and configured as an access to a surgical site and a second lumen sized and configured to contain a tensioning device that, when acted upon, will deflect the steerable portion. The tensioning device may be directly or remotely attached to an actuation device that operates to control the tensioning and loosening of the tensioning device.
1. A method of manufacturing an access device having a primary and secondary lumen, the method comprising:
wrapping a first wire around a mandrel;
resting a first tube on the first wire, the first tube extending further in length than the first wire along the mandrel;
inserting the mandrel through a second tube to form an assembly;
placing the assembly into a control tube;
heating the control tube and assembly; and
removing the control tube and mandrel to form the access device comprising the first and second tubes and the first wire.
2. The method of claim 1 further comprises wrapping a second wire around the first tube, first wire and mandrel.
3. The method of claim 1 further comprises coating the mandrel with a plastic material.
4. The method of claim 2 further comprises fusing a tip around the distal end of the second wire.
5. The method of claim 2 further comprises attaching a pull wire to a distal end of the second wire.
6. The method of claim 5 wherein the second tube comprises of silicon.
7. The method of claim 1 further comprising assembling a plurality of ring-shaped members around the first wire and the first tube.
8. The method of claim 7 wherein the plurality of ring-shaped members include at least one of plastic rings, metallic rings, un-reinforced plastic rings and metal reinforced plastic rings assembled along the first tube.
9. The method of claim 1 wherein the first tube comprises a semi-rigid tube extending partially through the first tube.
10. The method of claim 9 wherein the first tube is more flexible than the semi-rigid tube.
11. The method of claim 1 wherein the first tube has a diameter smaller than a diameter of the mandrel.
12. The method of claim 5 further comprises inserting the pull wire through the first tube prior to attaching the pull wire to a distal end of the second wire.
13. The method of claim 2 further comprising extending the second wire beyond the first tube by continuing to wrap the second wire around the first wire and the first tube beyond a distal end of the first tube.
14. The method of claim 2 further comprising:
inserting a support wire through the first tube;
attaching proximal and distal ends of the support wire to the mandrel;
heating the mandrel, the first wire, the second wire, the support wire and the first tube;
removing the support wire from the first tube; and
removing the mandrel from the first wire.
15. The method of claim 14 further comprising:
inserting a pull wire through the first tube; and
attaching the pull wire between at least one loop in the second wire, the support wire having a diameter greater than the pull wire.
16. The method of claim 9 wherein the first tube is longer lengthwise than the semi-rigid tube.