Stent pattern for high stent retention
AssigneeAdvanced Cardiovascular Systems, Inc.
InventorsAlexander Nikanorov, Keif Fitzgerald, Steven Tyler, Boris Anukhin
Life of this patent
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Abstract
An expandable stent has larger cells located at the distal end of the stent than in the body portion so that a catheter balloon can more easily protrude into the cells to increase stent retention relative to the balloon. The intravascular stent has a plurality of cylindrical rings connected by links, the spacing of which is a factor in defining the cell size. The stent can be compressed or crimped onto a balloon catheter to a very low profile and maintain a high degree of stent retention due to increased spacing between rings in the region of the distal end ring.
Claims42
A stent mounted on an expandable member of a catheter for use in a body lumen, comprising:
- a plurality of cylindrical rings aligned along a common longitudinal axis and interconnected to form the stent, each cylindrical ring having a first delivery diameter and a second implanted diameter;
- each cylindrical ring having a distal end and a proximal end and being spaced apart longitudinally to form a plurality of first cells;
- and
- a distal end ring having a distal end and a proximal end and being spaced apart longitudinally from an adjacent ring to form a plurality of second cells for increasing stent retention relative to the expandable member.
The stent of claim 11, wherein the stent is formed from any of the group of metal alloys consisting of stainless steel, tantalum, nickel-titanium, cobalt-chromium and titanium.
The stent of claim 13, wherein the stent is formed from the group of shape memory alloys consisting of nickel-titanium and nickel-titanium-vanadium.
A stent mounted on an expandable member of a catheter for use in a body lumen, comprising:
- a plurality of body rings aligned along a common longitudinal axis and interconnected to form the stent;
- each body ring being spaced apart longitudinally to form a first gap;
- and
- at least two distal end rings being spaced apart longitudinally to form a second gap for increasing stent retention relative to the expandable member.
A flexible intravascular stent mounted on an expandable member of a catheter for use in a body lumen, comprising:
- a plurality of body rings aligned along a common longitudinal axis and interconnected to form the stent, each body ring having a first delivery diameter and a second implanted diameter;
- each body ring having a distal end and a proximal end and being spaced apart longitudinally to form a first gap;
- a first distal end ring and a second distal end ring each having a distal end and a proximal end and being spaced apart longitudinally from an adjacent body ring to form second gap, the second gap being greater than the first gap;
- and
- the first distal end ring being interconnected to the second distal end ring with a plurality of substantially straight links.
A flexible intravascular stent mounted on an expandable member of a catheter for use in a body lumen, comprising:
- a plurality of body rings aligned along a common longitudinal axis and interconnected to form the stent, each body ring having a first delivery diameter and a second implanted diameter;
- each body ring having a distal end and a proximal end and being spaced apart longitudinally to form a first gap;
- a first distal end ring and a second distal end ring each having a distal end and a proximal end and being spaced apart longitudinally from an adjacent body ring to form second gap, the second gap being greater than the first gap;
- and
- the first distal end ring being interconnected to the second distal end ring with a plurality of undulating links.
Dependencies are inferred from the claim text.