Stents having biodegradable layers
First Claim
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1. A method of preparing a laminate coronary stent comprising:
- a. providing a stent framework having a plurality of struts, each strut having a luminal, abluminal and side wall surfaces;
b. depositing a plurality of bioabsorbable polymer layers on the luminal, abluminal and side wall surfaces of each strut of said stent framework to form said laminate coronary stent;
c. depositing at least one active agent in crystalline form; and
d. sintering the stent after each polymer layer is deposited;
wherein said plurality of layers forms a coating on the stent framework, the coating consisting essentially of the bioabsorbable polymer and the active agent in crystalline form, and wherein at least one internal layer comprises the active agent; and
wherein the stent framework has a thickness of about 50% or less of a thickness of the laminate coronary stent.
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Abstract
A method for preparing a laminate coronary stent comprising: providing a stent framework; and depositing a plurality of layers on said stent framework to form said laminate coronary stent; wherein at least one of said layers comprises a bioabsorbable polymer.
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Citations
16 Claims
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1. A method of preparing a laminate coronary stent comprising:
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a. providing a stent framework having a plurality of struts, each strut having a luminal, abluminal and side wall surfaces; b. depositing a plurality of bioabsorbable polymer layers on the luminal, abluminal and side wall surfaces of each strut of said stent framework to form said laminate coronary stent; c. depositing at least one active agent in crystalline form; and d. sintering the stent after each polymer layer is deposited; wherein said plurality of layers forms a coating on the stent framework, the coating consisting essentially of the bioabsorbable polymer and the active agent in crystalline form, and wherein at least one internal layer comprises the active agent; and wherein the stent framework has a thickness of about 50% or less of a thickness of the laminate coronary stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of preparing a laminate coronary stent comprising:
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a. providing a stent framework having a plurality of struts, each strut having a luminal, abluminal and side wall surfaces; b. depositing a plurality of layers on the luminal, abluminal and side wall surfaces of each strut of said stent framework to form a coating, wherein forming the coating comprises the following steps; i. discharging a crystalline pharmaceutical agent or an active biological agent in dry powder form through a first orifice; ii. forming a supercritical or near supercritical fluid solution comprising at least one supercritical fluid solvent and a first polymer and discharging said supercritical or near supercritical fluid solution through said first orifice or through a second orifice under conditions sufficient to form solid particles of the first polymer; iii. depositing the first polymer and the pharmaceutical agent or the active biological agent particles onto said framework, wherein an electrical potential is maintained between the framework and the first polymer and the pharmaceutical agent or the active biological agent particles; iv. sintering the first polymer under conditions that do not substantially modify the morphology of the pharmaceutical agent or the activity of the biological agent; V. forming a supercritical or near supercritical fluid solution comprising at least one supercritical fluid solvent and a second polymer and discharging said supercritical or near supercritical fluid solution through said first orifice or through a second orifice under conditions sufficient to form solid particles of the second polymer; iii. depositing the second polymer onto said framework, wherein an electrical potential is maintained between the framework and the second polymer and the pharmaceutical agent or the active biological agent particles; iv. sintering the second polymer under conditions that do not substantially modify the morphology of the pharmaceutical agent or the activity of the biological agent; wherein the coating consists essentially of the first and second polymers and the pharmaceutical agent or the active biological agent, and wherein at least one internal layer comprises at least one pharmaceutical agent and/or active biological agent; and the stent framework has a thickness of about 50% or less of a thickness of the laminate coronary stent. - View Dependent Claims (16)
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Specification