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40-O-(2-hydroxy)ethyl-rapamycin coated stent

a stent and ethyl-rapamycin technology, applied in the field of sustained delivery of 40o-(2-hydroxy) ethyl-rapamycin from a stent, can solve the problems of affecting the delivery of stent, etc., to reduce the release rate of drug, and reduce the effect of drug releas

Inactive Publication Date: 2007-02-08
ABBOTT CARDIOVASCULAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] In yet another aspect of the present invention, a method of treating a polymeric coating on a stent to reduce the rate of release of the drug from the coating is disclosed including exposing the coating to a temperature of a sufficient degree to cause modifications in the structure of the polymer which allows for the reduction of the release rate of the drug through the polymer.
[0014] Also disclosed, in another aspect, is a method of treating a coated stent containing a therapeutic substance to reduce the rate of release of the therapeutic substance from the coating including subjecting the coating to a stimuli so as to change the property of at least a region of the coating such that the change of the property of the region of the coating causes the therapeutic substance to be released more slowly from the region that has the changed property.

Problems solved by technology

A problem associated with the above procedure includes formation of intimal flaps or torn arterial linings, which can collapse and occlude the conduit after the balloon is deflated.
Vasospasms and recoil of the vessel wall also threaten vessel closure.
Yet, restenosis is still a significant clinical problem with rates ranging from 20-40%.
When restenosis does occur in the stented segment, its treatment can be challenging, as clinical options are more limited as compared to lesions that were treated solely with a balloon.
In order to provide an efficacious concentration to the treated site, systemic administration of such medication often produces adverse or even toxic side effects for the patient.
A potential shortcoming of the foregoing method of medicating stents is that the release rate of the therapeutic substance may be too high to provide an efficacious treatment.

Method used

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  • 40-O-(2-hydroxy)ethyl-rapamycin coated stent
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  • 40-O-(2-hydroxy)ethyl-rapamycin coated stent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0090] 35 13 mm PENTA stents (available from Guidant Corporation) were coated by spraying a 2% (w / w) solution of poly(ethylene-co-vinyl alcohol) (44 mole % ethylene) (“EVAL”) in 98% (w / w) dimethylacetamide. The solvent was removed by baking at 140° C. for 2 hours. A solution of 1.9% (w / w) EVAL and 0.7% (w / w) 40-O-(2-hydroxy)ethyl-rapamycin in a mixture of 68.2% (w / w) dimethylacetamide and 29.2% (w / w) ethanol was spray coated onto the stents to a thickness with a target of 175 μg of 40-O-(2-hydroxy)ethyl-rapamycin on each stent. The stents were then baked at 50° C. for 2 hours. A barrier layer was formed by spraying the stents with a 4% (w / w) solution of EVAL in a mixture of 76% (w / w) dimethylacetamide and 20% (w / w) pentane. Another 2 hour bake at 50° C. was performed to remove the solvent.

[0091] A select number of stents were analyzed to compare the target coating formulation with the final coating formulation. The results are as follows: For the primer layer, there was a target dr...

example 2

[0092] A drug-coated stent was placed in a volumetric flask. An appropriate amount of the extraction solvent acetonitrile with 0.02% BHT as protectant was added (e.g., in a 10 ml volumetric flask, with about 9 ml solvent added). The flask was sonicated for a sufficient time to extract all of the drug from the reservoir region. Then, the solution in the flask was filled to mark with the solvent solution. The drug solution was the analyzed by HPLC. The HPLC system consisted of a Waters 2690 system with an analytical pump, a column compartment (set at 40° C.), an auto-sampler, and a 996 PDA detector. The column was an YMC Pro C18 (150 mm×4.6 I.D., 3 μm particle size), maintained at a temperature of 40° C. The mobile phase consisted of 75% acetonitrile and 25% 20 mMolar ammonium acetate. The flow rate was set on 1 ml / min. The HPLC release rate results were quantified by comparing the results with a reference standard. The total drug content of the stent was then calculated.

example 3

[0093] 34 13 mm PENTA stents were coated by spraying a 2% (w / w) solution of EVAL and 98% (w / w) dimethylacetamide. The solvent was removed by baking at 140° C. for 2 hours. A solution of 1.9% (w / w) EVAL and 1.1% (w / w) 40-O-(2-hydroxy)ethyl-rapamycin in a mixture of 67.9% (w / w) dimethylacetamide and 29.1% (w / w) ethanol was spray coated onto the stents to a thickness with a target of 275 μg of 40-O-(2-hydroxy)ethyl-rapamycin on each stent. The stents were then baked at 50° C. for 2 hours. A barrier layer was formed by spraying the stents with a 4% (w / w) solution of EVAL in a mixture of 76% (w / w) dimethylacetamide and 20% (w / w) pentane. Another 2 hour bake at 50° C. was performed to remove the solvent.

[0094] A select number of stents were analyzed to compare the target coating formulation with the final coating formulation. The results are as follows: For the primer layer, there was a target dry weight of 40 μg of polymer, and a measured average dry weight of 43±3 μg of polymer. For th...

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PUM

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Abstract

A method and coating for reducing the release rate of an active agent from an implantable device, such as a stent, is disclosed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to drug eluting implantable devices, one example of which is a stent. More particularly, the invention relates to sustained delivery of 40-O-(2-hydroxy)ethyl-rapamycin from a stent. [0003] 2. Description of the Background [0004] Percutaneous transluminal coronary angioplasty (PTCA) is a procedure for treating heart disease. A catheter assembly having a balloon portion is introduced percutaneously into the cardiovascular system of a patient via the brachial or femoral artery. The catheter assembly is advanced through the coronary vasculature until the balloon portion is positioned across the occlusive lesion. Once in position across the lesion, the balloon is inflated to a predetermined size to remodel the vessel wall. The balloon is then deflated to a smaller profile to allow the catheter to be withdrawn from the patient's vasculature. [0005] A problem associated with the above procedure includ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/06A61L31/00A61F2/84A61L27/54A61L31/16
CPCA61L27/54A61L31/16A61L2300/606A61L2300/602A61L2300/416A61F2250/0067A61F2/844
Inventor HOSSAINY, SYED F.A.STEWART, GORDONWILLIAMS, MARK A.ROYAL, JEFFCONSIGNY, PAUL M.HAPP, DORIE M.SCHEINPFLUG, KURTHU, TY
Owner ABBOTT CARDIOVASCULAR
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