Method of making a variable surface area stent
First Claim
1. A method of manufacturing a stent, the stent including a tubular body including a plurality of struts, the struts defining a first end segment of the body, an opposing second end segment of the body, and a middle segment of the body between the first and second end segments, the method comprising:
- performing a roughening process on the plurality of struts; and
followed bydepositing a therapeutic agent on the body so that the first or second end segment has a lesser amount or concentration of the agent than the middle segment as a result of a difference in surface roughness, the difference present between struts of the first or second end segment as compared to struts of the middle segment.
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Abstract
A stent of variable surface area as determined by stent struts. The stent can have a variable surface area per unit length which accommodates a therapeutic agent. A patterned distribution of therapeutic agent can be provided throughout the stent. The stent can have an increased level of therapeutic agent near an end of the stent. A decreased level of therapeutic agent can be provided near an end of one embodiment of a stent. Indentations can be provided at the surface of the stent with therapeutic agent disposed therein. The stent can be cut with struts of variable thickness to provide the variable stent surface area.
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Citations
17 Claims
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1. A method of manufacturing a stent, the stent including a tubular body including a plurality of struts, the struts defining a first end segment of the body, an opposing second end segment of the body, and a middle segment of the body between the first and second end segments, the method comprising:
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performing a roughening process on the plurality of struts; and
followed bydepositing a therapeutic agent on the body so that the first or second end segment has a lesser amount or concentration of the agent than the middle segment as a result of a difference in surface roughness, the difference present between struts of the first or second end segment as compared to struts of the middle segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a stent, the stent including a tubular body including a plurality of struts, the struts defining a first end segment of the body, an opposing second end segment of the body, and a middle segment of the body between the first and second end segments, the method comprising:
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masking the first or second end segment with a protective layer;
followed byetching the middle segment to increase the surface area of the middle segment;
followed byremoving the protective layer; and
followed bydepositing a therapeutic agent on the body so that the first or second end segment has a lesser amount or concentration of the agent than the middle segment as a result of the etching, the difference present between struts of the first or second end segment as compared to struts of the middle segment. - View Dependent Claims (10, 11, 15)
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12. A method of manufacturing a stent, the stent including a tubular body including a plurality of struts, the struts defining a first end segment of the body, an opposing second end segment of the body, and a middle segment of the body between the first and second end segments, the method comprising:
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removing material from the plurality of struts to form indentations in the plurality of struts, the indentations in struts of the middle segment having a greater volume than indentations in struts of the first or second end segment; and
followed bydepositing a therapeutic agent on the body so that the first or second end segment has a lesser amount or concentration of the agent than the middle segment as a result of a difference in the volume of the indentations. - View Dependent Claims (13, 14, 16, 17)
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Specification