Apparatus and methods for delivery of multiple distributed stents
View Patent ↗Delivery catheters and systems are adapted for delivering multiple discreet prostheses in body lumens. An exemplary delivery catheter comprises a sheath, a pusher for moving the prostheses relative to the sheath, and a valve member for selectively retaining the prostheses in the sheath. For balloon expandable stents, an elongated shaft and an expandable member are slidably disposed in the sheath, and the prostheses are positionable on the expandable member for deployment in the body lumen. The valve member allows a selected number of prostheses to be deployed from the sheath while retaining other prostheses within the sheath.
1. A method of delivering one or more prostheses to a treatment site, the method comprising:
providing a catheter comprising:
a sheath having a proximal end, a distal end, an opening at the distal end, and a passage in communication with the opening, the one or more prostheses being movably disposed in the passage;
an expandable member near the distal end of the sheath, the one or more prostheses being positionable over the expandable member; and
a valve member near the distal end of the sheath adapted for selectively retaining a first set of prostheses within the passage and to engage the one or more prostheses whereby the one or more prostheses may be moved relative to the expandable member by moving the sheath; wherein the valve member comprises an annular structure coupled to an inner surface of the sheath and having an inner diameter smaller than the inner diameter of the sheath so as to engage the first set of prosthesis therein;
positioning the distal end of the sheath and the expandable member at the treatment site; and
proximally retracting the sheath relative to the expandable member to move the valve member and thereby cause a first set of prostheses to pass through the opening of the sheath for expansion at the treatment site via the expandable member while retaining a second set of prostheses within the passage via engagement of the valve member with the second set of prostheses.
2. The method of claim 1 , wherein the first set of prostheses is axially coupled with the second set of prostheses prior to the sheath being proximally retracted, and wherein the method further comprises de-coupling the first set of prostheses and the second set of prostheses.
3. The method of claim 1 , wherein the valve member prevents the first set of prostheses from advancing through the passage under a first force and allows the first set of prostheses to pass through the passage under a second force higher than the first force.
4. The method of claim 1 , wherein the valve member comprises a pair of lobes positioned proximally of the distal end of the sheath, the pair of lobes extending radially into the passage and adapted to engage the first set of prostheses therein.
5. The method of claim 1 , further comprising distally advancing a pusher tube relative to the sheath to position the one or more prostheses over the expandable member, the pusher tube being disposed within the passage of the sheath.