Stent delivery catheter system with a helicoid hypotube
Various embodiments for a stent delivery device or catheter system that includes a stent disposed between an inner shaft and an outer sheath. A housing is coupled to the inner shaft and outer sheath with a rotary reel disposed in the housing and configured for rotation with respect to the housing. A hypotube is disposed in the housing and fixed thereto with the inner shaft extending into the opening of the hypotube and the outer sheath enshrouding a portion of the hypotube. Rotation of the rotary reel in a first direction pulls the outer sheath over the hypotube along the generally circular path to retract the outer sheath from the stent. In some embodiments, a rapid deployment mechanism allows for retracdtion of the outer sheat at an increased rate.
1. A stent delivery system comprising
a catheter tip coupled to an inner shaft and an outer sheath with a stent disposed between the inner shaft and the outer sheath, the inner shaft and the outer sheath extending from a distal end to a proximal end;
a housing coupled to the inner shaft and outer sheath;
a rotary reel disposed in the housing and configured for rotation with respect to the housing, the rotary reel having a connector fixed to the outer sheath; and
a hypotube disposed in the housing and fixed thereto with the inner shaft extending into an opening of the hypotube and the outer sheath enshrouding a portion of the hypotube, the hypotube extending from a first end of the housing to a second end of the housing in a generally circular path defined by the rotary reel such that rotation of the rotary reel in a first direction pulls the outer sheath over the hypotube along the generally circular path to retract the outer sheath from the stent.
2. The stent delivery system of claim 1 , further comprising a thumbwheel mounted to the housing and connected to the rotary reel.
3. The stent delivery system of claim 2 , further comprising a ratchet disposed between the thumbwheel and the housing so that the thumbwheel is rotatable only in the first direction.
4. The stent delivery system of claim 2 , further comprising a flexible member connecting the thumbwheel to the rotary reel.
5. The stent delivery system of claim 4 , in which the flexible member is selected from a group comprising of a belt, rope, wire or combinations thereof.
6. The stent delivery system of claim 4 , wherein the flexible member is secured to a spiral track of the rotary reel so that a rate of retraction of the outer sheath increases when withdrawn in a proximal direction.
7. The stent delivery system of claim 1 , in which the rotary reel is disposed near the proximal end of the housing and the thumbwheel is disposed adjacent the outer sheath.
8. A catheter system comprising
a catheter tip coupled to an inner shaft and an outer sheath that partially surrounds the inner shaft and wherein both the inner shaft and the outer sheath extends from a distal end to a proximal end;
a housing coupled to the inner shaft and outer sheath;
a rotary reel disposed in the housing and configured for rotation with respect to the housing, the rotary reel having a connector fixed to the outer sheath; and
a hypotube disposed in the housing and fixed thereto with the inner shaft extending into an opening of the hypotube and the outer sheath enshrouding a portion of the hypotube, the hypotube extending from a first end of the housing to a second end of the housing in a generally circular path defined by the rotary reel such that rotation of the rotary reel in a first direction pulls the outer sheath over the hypotube along the generally circular path to retract the outer sheath with respect to the inner shaft.
9. A method for stent delivery, comprising:
providing a catheter tip coupled to an inner shaft and an outer sheath with a stent disposed between the inner shaft and the outer sheath, the inner shaft and the outer sheath extending from a distal end to a proximal end, a housing coupled to the inner shaft and outer sheath, a rotary reel disposed in the housing and configured for rotation with respect to the housing, the rotary reel having a connector fixed to the outer sheath and a hypotube disposed in the housing and fixed thereto with the inner shaft extending into an opening of the hypotube and the outer sheath enshrouding a portion of the hypotube, the hypotube extending from a first end of the housing to a second end of the housing in a generally circular path defined by the rotary reel;
positioning the stent at a desired location within a patient, and
rotating the rotary reel in a first direction to pull the outer sheath over the hypotube along the generally circular path to retract the outer sheath from the stent.