Stent delivery catheter with fast slider and slow thumbwheel control
Various embodiments for a stent delivery device that utilizes a wheel for slow retraction of an outer sheath and a slider for fast retraction of the outer sheath during delivery of a self-expanding implantable device such as a stent or stent graft.
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 extending along a longitudinal axis from a first end to a second end, the housing defining a slot extending for a portion of the longitudinal axis;
a slider disposed in the slot and coupled to the outer sheath by a flexible member so that movement of the slider transmits force through the flexible member to cause movement of the outer sheath relative to the inner shaft; and
a wheel mounted on the housing and coupled to the slider by the flexible member such that rotation of the wheel causes the outer sheath to move along the longitudinal axis, wherein rotation of the wheel is configured to cause less translation of the outer sheath as compared to actuation of the slider for a given amount of movement and wherein the slider and the wheel are configured to move relative to each other.
2. The stent delivery system of claim 1 , in which the outer sheath is coupled to the slider by the flexible member and the flexible member is configured to be wound about a rotational axis defined by the wheel.
3. The stent delivery system of claim 1 , in which the wheel is mounted offset with respect to the longitudinal axis.
4. The stent delivery system of claim 1 , in which the wheel is mounted aligned with respect to the longitudinal axis.
5. The stent delivery system of claim 1 , in which rotation of the wheel causes the slider as well as the outer sheath to move along the longitudinal axis.
6. The stent delivery system of claim 1 , in which the outer sheath is coupled to the slider by a mechanical link.
7. The stent delivery system of claim 1 , wherein the slider comprises a pulley member and in which the outer sheath is coupled to the slider by engaging the pulley member with the flexible member.
8. A stent delivery system comprising:
a housing extending along a longitudinal axis from a proximal end to a distal end, the housing defining a slot extending along a portion of the longitudinal axis;
an outer sheath configured for movement along the longitudinal axis, the outer sheath being coupled by a flexible member to a slider disposed in the slot, so that movement of the slider transmits force through the flexible member to cause movement of the outer sheath; and
a wheel mounted on the housing and coupled to the outer sheath by the flexible member such that rotation of the wheel causes the outer sheath to move along the longitudinal axis, wherein rotation of the wheel is configured to cause less translation of the outer sheath as compared to actuation of the slider for a given amount of movement and wherein the slider and wherein the slider and the wheel are configured to move relative to each other.
9. The stent delivery system of claim 8 , in which the flexible member is configured to be wound about a rotational axis defined by the wheel.
10. The stent delivery system of claim 8 , in which the wheel is mounted offset with respect to the longitudinal axis.
11. The stent delivery system of claim 8 , in which the wheel is mounted aligned with respect to the longitudinal axis.
12. The stent delivery system of claim 8 , in which rotation of the wheel causes the slider as well as the outer sheath to move along the longitudinal axis.
13. The stent delivery system of claim 8 , in which the outer sheath is coupled to the slider by a mechanical link.
14. The stent delivery system of claim 8 , wherein the slider comprises a pulley member and in which the outer sheath is coupled to the slider by engaging the pulley member with the flexible member.
15. A method of delivering a self-expanding stent to selected location in a body vessel, the method comprising:
moving a stent to a selected location, the stent being disposed adjacent a catheter tip and confined between an inner shaft and an outer sheath at a distal end of a delivery system;
winding a flexible member connected to the outer sheath so that the outer sheath is moved relative to the inner shaft along a direction from the distal end toward a proximal end of the delivery system to allow a portion of the self-expanding stent to be expanded into the body vessel;
rotating a wheel coupled to the outer sheath by the flexible member to move the outer sheath relative to the inner shaft along a direction from the distal end toward a proximal end of the delivery system; and
translating a slider member coupled to the outer sheath by the flexible member to move the outer sheath relative to the inner shaft along a direction from the distal end toward a proximal end of the delivery system,
wherein rotation of the wheel is configured to cause less translation of the outer sheath as compared to actuation of the slider for a given amount of movement and wherein the slider and wherein the wheel and the slider are configured to move relative to each other.
16. The method of claim 15 , wherein the outer sheath undergoes relatively less translation along the longitudinal axis due to rotation of the wheel as compared to actuation of the slider for a given amount of movement.
17. The method of claim 16 , further comprising translating the outer sheath at a first rate by rotating the wheel and translating the outer sheath at a second rate.