Vessel tensioning handle and method of vessel harvesting
Embodiments of the invention provide a vessel tensioning handle and method of placing tension on a section of a vessel being harvested. The handle can include a housing, a bobbin assembly, a vessel tensioning tape, and a tensioning device member. The tensioning device member can be coupled to a cannula that is coupled to the vessel. The method can include using the vessel tensioning tape to place tension on the section of the vessel as the cutting device is advanced over the vessel.
1 . A vessel tensioning handle for use with a cutting device and a cannula for harvesting a section of a vessel, the cannula being coupled to the vessel, the handle comprising:
a housing adapted to be coupled to the cutting device;
a bobbin assembly positioned within the housing;
a vessel tensioning tape coupled to the bobbin assembly; and
a tensioning device member coupled to the vessel tensioning tape, the tensioning device member adapted to be coupled to the cannula, the vessel tensioning tape placing tension on the section of the vessel as the cutting device is advanced over the vessel.
2 . The handle of claim 1 and further comprising a brake and wherein the housing includes a moveable brake handle adapted to engage the brake.
3 . The handle of claim 1 wherein the bobbin assembly includes a first housing side, a second housing side, a bobbin shaft, and a coil tensioner.
4 . The handle of claim 1 wherein the bobbin assembly includes a snap-back mechanism to prevent rapid retraction of the vessel tensioning tape.
5 . The handle of claim 4 wherein the snap-back mechanism includes teeth molded in a portion of a housing, an arm that engages the teeth, a spring that biases the arm, and an arm-retaining pin about which the arm pivots.
6 . A method of harvesting a section of a vessel from surrounding tissue, the method comprising:
making a first incision at a proximal end of the section of the vessel;
making a second incision at a distal end of the section of the vessel;
inserting a cannula into the proximal end of the vessel;
securing the proximal end of the vessel to the cannula;
coupling a vessel tensioning tape to the cannula;
applying tension to the vessel; and
advancing a cutting device over the vessel.
7 . The method of claim 6 and further comprising retracting the vessel tensioning tape into a handle.
8 . The method of claim 7 and further comprising coring out the vessel from the surrounding tissue as the vessel tensioning tape is retracted into the handle.
9 . The method of claim 7 and further comprising applying a brake to stop retracting of the vessel tensioning tape.
10 . The method of claim 7 and further comprising applying tension to the vessel tensioning tape to cause the vessel tensioning tape to retract into the handle.
11 . The method of claim 6 and further comprising coupling the vessel tensioning tape to the cannula with a twisting motion.
12 . The method of claim 6 and further comprising guiding the cutting device with a balloon catheter while retracting the vessel tensioning tape.
13 . The method of claim 6 and further comprising pulling the cannula and the vessel through the cutting device while retracting the vessel tensioning tape.
14 . The method of claim 6 and further comprising amplifying a cutting force applied to the handle.
15 . The method of claim 6 and further comprising assisting advancement of the cutting device along the vessel.
16 . The method of claim 6 and further comprising applying a substantially constant tension to the vessel as the vessel is harvested.
17 . The method of claim 6 and further comprising applying tension to the vessel by retracting the vessel tensioning tape around a bobbin assembly in a handle.
18 . The method of claim 6 and further comprising applying tension to the vessel with a piston assembly.
19 . The method of claim 6 and further comprising reducing rapid retraction of the vessel tensioning tape into a handle.
20 . The method of claim 18 and further comprising reducing rapid retraction of the vessel tensioning tape by centripetal force causing an arm to engage teeth in a housing.
21 . The method of claim 6 and further comprising manipulating a handle coupled to the vessel tensioning tape in order to manipulate the cutting device.