Dilation delivery system for a medical device
A kit including a sheath having a tubular body with proximal and distal ends, an axis extending between the ends and a wall defining a bore extending along the axis to the distal end of the body. A delivery tube having proximal and distal ends and a lumen is adapted for disposition within the bore of the sheath in sealing engagement with the sheath, the delivery tube being slideable distally relative to the sheath. An elongated cannula having proximal and distal ends and a lumen is adapted for disposition inside the lumen of the delivery tube and an elongated dilator is adapted to fit within the lumen of the cannula with a proximal portion of the dilator extending proximally beyond the proximal ends of the cannula and delivery tube and in sealing engagement with the delivery tube proximal to the cannula.
1. A method of connecting a cannula to a hollow organ of a patient's body comprising the steps of:
advancing a liquid-filled enclosure including a sheath having a tapered surface defined by a plurality of flaps at the distal end of the sheath, the sheath containing a hollow cannula having an expandable anchor at its distal end disposed proximate the distal end of the sheath, in a distal direction towards the organ until the tapered surface passes through the wall of the organ;
bringing the flaps of the sheath to an open position in which the flaps are separate from one another and the distal end of the sheath is in communication with the interior of the organ and advancing the cannula distally relative to the sheath so that the anchor is positioned within the interior of the organ;
expanding the anchor within the interior of the organ; and
withdrawing the sheath proximally away from the organ while leaving the cannula in place with the anchor inside the organ and a proximal portion of the cannula projecting from the organ; and
the sheath includes a delivery tube containing the cannula and anchor, the delivery tube having an open distal end positioned adjacent the distal end of the sheath, and the method further includes advancing the cannula distally relative to the delivery tube so that the anchor passes out of the distal end of the delivery tube.
2. The method of claim 1 , wherein the distal end of the delivery tube is disposed within the interior of the organ upon completion of the advancing step, and wherein the method further includes withdrawing the sheath proximally relative to the delivery tube while maintaining the distal end of the delivery tube within the interior of the organ.
3. The method of claim 2 , wherein the step of advancing the cannula relative to the delivery tube includes advancing a shaft disposed within the interior of the cannula and projecting proximally from the delivery tube while the cannula is locked to the shaft, the method further including the step of unlocking the cannula from the shaft.
4. The method of claim 3 , wherein the withdrawing step further includes withdrawing the sheath proximally along the shaft while holding the shaft in position relative to the organ before unlocking the cannula from the shaft.
5. The method of claim 4 , wherein the shaft is a portion of a dilator, the dilator including a tip having a tapered surface at the distal end of the shaft, the tip of the dilator projecting distally from the tapered surface of the sheath during the advancing step.