Crush recoverable polymer scaffolds
First Claim
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1. A method making a medical device, comprising:
- (a) providing a polymeric tube;
(b) changing at least one of the mechanical properties of the tube;
(c) cutting a pattern into the tube by a laser process, wherein the pattern includes;
(i) a set of rings including a proximal end ring, a distal end ring opposing the proximal end ring, and middle rings positioned between the end rings, wherein each ring is associated with its direct neighboring ring by links, and wherein at least one pair of neighboring middle rings can be delineated, via corresponding links there between, into closed cells comprising a W- or a general W-shaped zone included within the closed cells;
(ii) at least one of the links being a marker link, the marker link having a first part-cylindrical protrusion off a first side wall of the marker link for holding a first marker and a second part-cylindrical protrusion off a second, opposite side wall of the marker link for holding a second marker, wherein the first and second protrusions are symmetrically aligned off of the marker link and are not longitudinally off-set from one another off of the marker link; and
(iii) wherein the polymeric tube is cut by the laser such that the set of rings and links are shaped to have a minimum crimped diameter such that in the minimum crimped diameter, a pair of rings, between which the marker link resides, do not make contact with a bulging perimeter of the first and second protrusions; and
(d) placing the first and second markers in the protrusions and forming a stent;
(e) crimping the stent to a crimped diameter on a section of a catheter delivery assembly, wherein the crimping includes heating the polymeric stent to a target temperature, such that the pair of rings, between which the marker link resides, do not make contact with the bulging perimeter of the first and second protrusions in the crimped diameter, whereby a medical device comprising the stent and catheter is produced.
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Abstract
A method of manufacturing a stent is disclosed. The stent includes a minimum crimped diameter such that in the minimum crimped diameter, a pair of stent rings, between which marker support structures reside, do not make contact with the marker support structures. The crimped profile of the stent of the present invention can be as small as the crimped profile of a same stent but without the marker support structures.
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Citations
57 Claims
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1. A method making a medical device, comprising:
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(a) providing a polymeric tube; (b) changing at least one of the mechanical properties of the tube; (c) cutting a pattern into the tube by a laser process, wherein the pattern includes; (i) a set of rings including a proximal end ring, a distal end ring opposing the proximal end ring, and middle rings positioned between the end rings, wherein each ring is associated with its direct neighboring ring by links, and wherein at least one pair of neighboring middle rings can be delineated, via corresponding links there between, into closed cells comprising a W- or a general W-shaped zone included within the closed cells; (ii) at least one of the links being a marker link, the marker link having a first part-cylindrical protrusion off a first side wall of the marker link for holding a first marker and a second part-cylindrical protrusion off a second, opposite side wall of the marker link for holding a second marker, wherein the first and second protrusions are symmetrically aligned off of the marker link and are not longitudinally off-set from one another off of the marker link; and (iii) wherein the polymeric tube is cut by the laser such that the set of rings and links are shaped to have a minimum crimped diameter such that in the minimum crimped diameter, a pair of rings, between which the marker link resides, do not make contact with a bulging perimeter of the first and second protrusions; and (d) placing the first and second markers in the protrusions and forming a stent; (e) crimping the stent to a crimped diameter on a section of a catheter delivery assembly, wherein the crimping includes heating the polymeric stent to a target temperature, such that the pair of rings, between which the marker link resides, do not make contact with the bulging perimeter of the first and second protrusions in the crimped diameter, whereby a medical device comprising the stent and catheter is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A method of making a medical device, comprising:
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(a) providing a polymeric tube; (b) changing at least one of the mechanical properties of the tube; (c) cutting a pattern into the tube by a laser process, wherein the pattern includes; (i) a set of rings forming an open tubular body, the rings including struts that fold towards and unfold away from each other at crowns, (ii) a plurality of links, wherein each ring is associated with a neighboring ring by links, and (iii) at least one of the links positioned between a first ring and a second ring being designated as a marker link, the marker link running parallel to a longitudinal axis of the tubular body, the marker link having a first quasi-cylindrical overhang off of a first side of the marker link for holding a first marker and a second quasi-cylindrical overhang off of a second, opposite side of the marker link for holding a second marker, (d) placing the first marker in the first overhang and the second marker in the second overhang and forming a stent, wherein the first marker and second marker are positioned at a distance in a circumferential arrangement with respect to each other such that the first marker at least partially extends out from the first side of the marker link and the second marker at least partially extends out from the second side of the marker link, wherein the position of the first overhang from the first side of the maker link mirrors the position of the second overhang from the second opposite side of the marker link such that the overhangs are not longitudinally offset from each other, and (e) crimping the stent on a balloon of a catheter at an elevated temperature, such that in a crimped configuration the pair of first and second rings adjoining the marker link do not make contact with the first and second marker overhangs, and wherein the first overhang and second overhang including the first and second markers are arranged circumferentially off of the marker link and spaced from the first and second rings such that a crimped profile of the stent is the same as the crimped profile of a same stent but without the first and second overhangs. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57)
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Specification