Hollow helical stent system
First Claim
1. A stent system comprising:
- an actuation shaft having an elongated tubular body defining a lumen;
a stent releasably attached to the actuation shaft and formed from a resilient tube having a fluid passageway in fluid communication with the actuation shaft lumen, the stent having a helical expanded configuration where the resilient tube forms consecutive loops which have a blood flow lumen therethrough and a linear delivery configuration where the loops of the resilient tube are substantially straightened,wherein the stent is transformable from the delivery configuration to the helical expanded configuration through introduction of a deployment fluid into the fluid passageway of the resilient tube via the actuation shaft lumen;
a guidewire with an elongated body having a reduced diameter distal portion; and
a ring attached to a distal end of the stent, wherein the ring is slidable over the guidewire distal portion to abut a step in the guidewire.
1 Assignment
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Accused Products
Abstract
A stent is formed from a hollow resilient tube shaped into a helical expanded configuration to form a substantially cylindrical prosthesis that is releasably attached to an actuation shaft for delivery to a treatment site. The stent is deliverable in a substantially linear configuration and deployed with internal fluid pressure, which is delivered through the actuation shaft, to return to the helical expanded configuration. Specifically, injection of a deployment fluid into the resilient tube that forms the stent causes the stent to revert or spring back from the substantially linear delivery configuration to the original helical configuration, and in some applications to dilate a vessel. A ring is attached to a distal end of the stent to couple the stent system to a guidewire for delivery through the vasculature.
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Citations
19 Claims
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1. A stent system comprising:
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an actuation shaft having an elongated tubular body defining a lumen; a stent releasably attached to the actuation shaft and formed from a resilient tube having a fluid passageway in fluid communication with the actuation shaft lumen, the stent having a helical expanded configuration where the resilient tube forms consecutive loops which have a blood flow lumen therethrough and a linear delivery configuration where the loops of the resilient tube are substantially straightened, wherein the stent is transformable from the delivery configuration to the helical expanded configuration through introduction of a deployment fluid into the fluid passageway of the resilient tube via the actuation shaft lumen; a guidewire with an elongated body having a reduced diameter distal portion; and a ring attached to a distal end of the stent, wherein the ring is slidable over the guidewire distal portion to abut a step in the guidewire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of using a stent system within a vessel comprising the steps of:
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introducing a stent system into the vasculature, the stent system including an elongate tubular actuation shaft defining a lumen with a stent releasably attached at a distal end of the actuation shaft and formed from a resilient tube having a fluid passageway in fluid communication with the actuation shaft lumen, the stent having a helical expanded configuration where the resilient tube forms consecutive loops which have a blood flow lumen therethrough and a linear delivery configuration where the loops of the resilient tube are substantially straightened, the stent system further including a guidewire with an elongated body having a reduced diameter distal portion and a ring attached to a distal end of the stent, wherein the ring is slidable over the guidewire distal portion to abut a step in the guidewire; tracking the stent system through the vasculature, wherein the stent is in the substantially linear delivery configuration; positioning the stent at a treatment site within the vessel; and introducing a pressurized deployment fluid through the actuation shaft lumen into the fluid passageway of the resilient tube that forms the stent to thereby transform the stent from the substantially linear delivery configuration into the helical expanded configuration. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification