Expandable medical device with beneficial agent matrix formed by a multi solvent system
First Claim
1. An implantable medical device comprising:
- an implantable device body having a plurality of openings;
at least one base layer contained in the plurality of openings comprising a first polymer material that is soluble in a first solvent; and
at least one therapeutic layer contained in the plurality of openings comprising a first therapeutic agent and a second polymer material both of which are soluble in a common second solvent in which the first polymer material is substantially insoluble.
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Accused Products
Abstract
A multi solvent drug delivery matrix formation method is used to place layers into a reservoir in a stent in a stepwise manner to achieve extended delivery of water soluble, sensitive, or difficult to deliver drugs. The multi solvent matrix formation method allows the formation of a drug reservoir with a layered morphology in which the mixing between layers is limited to allow the different layers to perform different functions in controlling drug delivery. A stent having a drug delivery matrix includes a first beneficial agent layer affixed to the stent by depositing a first solution of a first polymer and a first solvent, and a second beneficial agent layer affixed to the first beneficial agent layer by depositing a second solution of a second polymer and a second solvent. The second solvent is selected so that the first polymer is substantially insoluble in the second solvent to prevent degradation of the first polymer during deposition of the second polymer. A therapeutic agent is provided in the first beneficial agent layer or the second beneficial agent layer to form a drug delivery matrix.
189 Citations
74 Claims
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1. An implantable medical device comprising:
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an implantable device body having a plurality of openings;
at least one base layer contained in the plurality of openings comprising a first polymer material that is soluble in a first solvent; and
at least one therapeutic layer contained in the plurality of openings comprising a first therapeutic agent and a second polymer material both of which are soluble in a common second solvent in which the first polymer material is substantially insoluble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An implantable medical device comprising:
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an implantable device body having a plurality of openings;
at least one therapeutic agent layer contained in the plurality of openings, wherein the therapeutic agent layer is formed with a first polymer, a first solvent, and a first therapeutic agent; and
at least one cap layer contained in the plurality of openings adjacent the at least one therapeutic agent layer, the at least one cap layer is formed with a second polymer and a second solvent, wherein the first therapeutic agent is at most marginally soluble in the second solvent. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of loading an implantable medical device with a controlled release polymer drug matrix:
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depositing a first solution of a first polymer, a first therapeutic agent, and a first solvent in which the first polymer and the first therapeutic agent are both soluble;
evaporating the first solvent;
depositing a second solution of a second polymer, and a second solvent in which the second polymer is soluble, wherein the first therapeutic agent is substantially insoluble in the second solvent; and
evaporating the second solvent. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of loading an implantable medical device with a controlled release polymer drug matrix:
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depositing a first solution of a first polymer and a first solvent in which the first polymer is soluble;
evaporating the first solvent;
depositing a second solution of a second polymer, a first therapeutic agent, and a second solvent in which the second polymer and the first therapeutic agent are both soluble, wherein the first polymer is substantially insoluble in the second solvent; and
evaporating the second solvent. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A method of loading an implantable medical device with a controlled release polymer drug matrix in a plurality of layers:
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creating a first layer by delivering a first solution of a first polymer and a first solvent and evaporating the first solvent;
creating a second layer by delivering a second solution of a second polymer and a second solvent, wherein the second solvent does not significantly dissolve the first layer; and
providing a therapeutic agent in at least one of the first and second layers. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61)
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62. An implantable stent comprising:
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an expandable stent body;
a first beneficial agent layer affixed to the stent by depositing a first solution comprising a first polymer and a first solvent, wherein the first polymer is soluble in the first solvent;
a second beneficial agent layer affixed to the first beneficial agent layer by depositing a second solution comprising a second polymer and a second solvent, wherein the second polymer is soluble in the second solvent and the first polymer is substantially insoluble in the second solvent; and
a therapeutic agent provided in the first beneficial agent layer or the second beneficial agent layer, wherein the therapeutic agent is soluble in the first or second solvent. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70)
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71. An implantable medical device comprising:
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an implantable device body having a plurality of openings;
at least two hydrophobic layers of matrix material in the openings; and
at least one hydrophilic therapeutic agent layer in the openings positioned between the hydrophobic layers.
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72. A method of loading an implantable medical device with a controlled release polymer drug matrix in a plurality of layers:
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creating a base layer by delivering a first solution of a first polymer and a first solvent and evaporating the first solvent;
annealing the base layer;
creating a therapeutic agent layer by delivering a second solution of a second polymer, a therapeutic agent, and a second solvent. - View Dependent Claims (73, 74)
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Specification