Retractable sheath devices, systems, and methods
First Claim
1. A medical device comprising:
- an inflation port in fluid communication with a lumen of an expandable member, the expandable member having an uninflated diameter and being configured to expand to an inflated diameter;
a coating comprising a therapeutic agent disposed on the expandable member, wherein the therapeutic agent is complexed or sequestered by one or more solubilizing agents; and
a retractable outer sheath having a permeable microstructure comprising micropores, the retractable outer sheath disposed around the expandable member and over the coating;
wherein when the expandable member is exposed to a fluid while the expandable member is at the uninflated diameter, the micropores are configured to permit at least partial replacement of air within the micropores with the fluid so as to allow for the fluid to pass through the retractable outer sheath and hydrate the coating so as to form solubilized particles of the therapeutic agent, and restrict release of the solubilized particles through the retractable outer sheath to limit unintended transfer of the therapeutic agent, andwherein inflation of the expandable member causes expansion of the micropores and exposes at least a portion of the hydrated coating, releasing the solubilized particles through the micropores.
1 Assignment
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Accused Products
Abstract
The invention is directed to delivery medical devices that enable consistent “on-demand” delivery of therapeutic agents to a vessel. The medical device of the current invention comprises retractable sheath comprising neckable elements. The medical device of the current invention comprises an expandable member, a hydrophilic coating comprising at least one therapeutic agent about the expandable member or structural layer and a retractable outer sheath with a selectively permeable microstructure. The design and methods disclosed herein ensures that therapeutic agent delivery occurs essentially only during retraction of the outer sheath, minimizing coating and/or therapeutic agent loss to the bloodstream and providing controlled delivery to the treatment site.
110 Citations
22 Claims
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1. A medical device comprising:
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an inflation port in fluid communication with a lumen of an expandable member, the expandable member having an uninflated diameter and being configured to expand to an inflated diameter; a coating comprising a therapeutic agent disposed on the expandable member, wherein the therapeutic agent is complexed or sequestered by one or more solubilizing agents; and a retractable outer sheath having a permeable microstructure comprising micropores, the retractable outer sheath disposed around the expandable member and over the coating; wherein when the expandable member is exposed to a fluid while the expandable member is at the uninflated diameter, the micropores are configured to permit at least partial replacement of air within the micropores with the fluid so as to allow for the fluid to pass through the retractable outer sheath and hydrate the coating so as to form solubilized particles of the therapeutic agent, and restrict release of the solubilized particles through the retractable outer sheath to limit unintended transfer of the therapeutic agent, and wherein inflation of the expandable member causes expansion of the micropores and exposes at least a portion of the hydrated coating, releasing the solubilized particles through the micropores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A medical device comprising:
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an inflation port in fluid communication with a lumen of an expandable member, the expandable member having an uninflated diameter and being configured to expand to an inflated diameter; a coating comprising a therapeutic agent disposed on the expandable member, and a retractable outer sheath having a permeable microstructure comprising micropores, the retractable outer sheath disposed around the expandable member and over the coating; wherein when the expandable member is exposed to a fluid while the expandable member is at the uninflated diameter, the micropores are configured to permit at least partial replacement of air within the micropores with the fluid so as to allow for the fluid to pass through the retractable outer sheath and hydrate the coating so as to form solubilized particles of the therapeutic agent and restrict release of the solubilized particles through the retractable outer, and wherein when the expandable member is at a treatment site, the inflation port is configured to inflate and expand the expandable member to the inflated diameter, which causes the expansion of the micropores and exposes at least a portion of the hydrated coating, releasing the solubilized particles through the micropores.
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Specification