摘要:
The invention is directed to eluting medical devices that enable consistent "on-demand" delivery of therapeutic agents to a vessel. 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 an outer sheath with a variably permeable microstructure. The design and methods disclosed herein ensures that therapeutic agent delivery occurs essentially only during expansion of the expandable member, minimizing coating and/or therapeutic agent loss to the bloodstream and providing controlled delivery to the treatment site.
摘要:
Methods and apparatus are disclosed for filling a therapeutic substance or drug within a hollow wire that forms a stent. The stent is placed within a chamber housing a fluid drug formulation. During filling, the chamber is maintained at or near the vapor-liquid equilibrium of the solvent of the fluid drug formulation. To fill the stent, a portion of the stent is placed into contact with the fluid drug formulation until a lumenal space defined by the hollow wire is filled with the fluid drug formulation via capillary action. After filling is complete, the stent is retracted such that the stent is no longer in contact with the fluid drug formulation. The solvent vapor pressure within the chamber is reduced to evaporate a solvent of the fluid drug formulation. A wicking means may control transfer of the fluid drug formulation into the stent.
摘要:
A medical device comprising a surface coated by at least two coating regions comprising a therapeutic agent is disclosed. These coating regions allow for the release of the therapeutic agent over different time periods.
摘要:
Ein Stent (10) mit einem rohrförmigen, an seinen Stirnseiten offenen Grundkörper (14), dessen Umlaufswandung (16) zumindest bereichsweise mit einem Beschichtungssystem (26) aus einem oder mehreren polymeren Trägern und wenigstens zwei pharmakologisch wirksamen Substanzen bedeckt ist, wobei die Substanzen nach Implantation des Stents (10) in den menschlichen oder tierischen Körper in das umgebende Gewebe freigesetzt wird, ist dadurch gekennzeichnet, dass die Konzentration der wenigstens zwei pharmakologischen Substanzen in Längsrichtung des Stents (10) derart vorgegeben ist, dass die Substanz eine in Abhängigkeit von den in der Applikation zu erwartenden pathophysiolgischen und/oder rheologischen Verhältnissen vorgegebene, in Längsrichtung des Stents (10) lokal unterschiedliche Elutionscharakteristik aufweist.
摘要:
Abstract: Apparati and methods are provided for the delivery of molecules to a site via a carrier fluid. The apparati include microchip devices whcih have reservoirs containing the molecules for release. The apparati and methods provide for active orpassive controlled relase of the molecules. Preferred embodiments include systems for intravenous administration of drugs, wherein drug molecules are released from the microchip devices into a carrier fluid ex vivo, such as a saline solution, forming a drug/saline solution mixture which is then delivered to a patient intravenously.
摘要:
Apparati and methods are provided for the delivery of molecules to a site via a carrier fluid. The apparati include microchip devices whcih have reservoirs containing the molecules for release. The apparati and methods provide for active or passive controlled relase of the molecules. Preferred embodiments include systems for intravenous administration of drugs, wherein drug molecules are released from the microchip devices into a carrier fluid ex vivo, such as a saline solution, forming a drug/saline solution mixture which is then delivered to a patient intravenously.