Intravascular stent
The invention is directed to an expandable stent for implanting in a body lumen, such as a coronary artery, peripheral artery, or other body lumen. The invention provides for an intravascular stent having a plurality of cylindrical rings connected by undulating links. The stent has a high degree of flexibility in the longitudinal direction, yet has adequate vessel wall coverage and radial strength sufficient to hold open an artery or other body lumen. The stent can be compressed or crimped onto a catheter to a very low profile since the peaks that are adjacent the curved portion of the undulating link are shorter than other peaks in the same cylindrical ring to prevent overlap yet still achieve a very low profile, tightly crimped stent onto a catheter.
1. A method for crimping an intravascular stent on a catheter, comprising:
providing a catheter having an expandable member;
providing a stent, comprising:
i. 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;
ii. each cylindrical ring having a plurality of first peaks and second peaks, each of the peaks having a height, the second peaks being shorter than the first peaks;
iii. at least one undulating link attaching each cylindrical ring to an adjacent cylindrical ring, the undulating links having a curved portion and a pair of straight portions which extend transverse to the stent longitudinal axis;
iv. each undulating link having a first arm and a second arm, the first arm and the second arm being straight and parallel to the longitudinal axis of the stent and being circumferentially offset from the second peak;
mounting the stent over the expandable member; and
compressing the stent into contact with the expandable member so that as the stent is compressed to the first delivery diameter, the pair of straight portions remain transverse to the stent longitudinal axis and the undulating link moves into longitudinal alignment with the second peak.
2. The method of claim 1 , wherein after compressing the stent into contact with the expandable member, the straight portions of the undulating link are transverse to the second peak.
3. The method of claim 1 , wherein prior to compressing the stent into contact with the expandable member, the curved portion of the undulating link is longitudinally offset relative to the second peak.