Diffusion barrier layer for implantable devices
First Claim
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1. A stent, comprising a coating containing particles, wherein the particles are configured to remain in the coating during the release of an active ingredient to reduce a rate of release of the active ingredient from the coating after the stent is implanted in a passageway.
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Abstract
A diffusion barrier for an implantable device, such as a stent, carrying a therapeutic or bioactive substance is disclosed. The diffusion barrier reduces the rate at which the therapeutic or bioactive substance is released from the device. The diffusion barrier can be made from a polymeric material impregnated with particles.
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Citations
35 Claims
- 1. A stent, comprising a coating containing particles, wherein the particles are configured to remain in the coating during the release of an active ingredient to reduce a rate of release of the active ingredient from the coating after the stent is implanted in a passageway.
- 21. A coating for a prosthesis comprising an agent and inorganic particles for reducing the rate at which the agent travels through the coating subsequent to the implantation of the prosthesis in a human body.
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27. A stent having a coating comprising:
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a first region including a polymer containing an active ingredient; and
a second region overlaying at least a portion of the first region, wherein the second region comprises particles adapted to prolong the residence time of the active ingredient at the site of implantation of the stent. - View Dependent Claims (28, 29, 30, 31)
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32. A stent having a coating comprising:
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(a) a first layer including at least one polymer and at least one active ingredient; and
(b) a barrier layer overlaying at least a portion of the first layer, the barrier layer comprising (i) particles adapted to reduce the rate of release of the active ingredient from the first layer after insertion of the stent into a biological lumen, and (ii) a first region and a second region, wherein the first region of the barrier layer has a greater particle volume fraction as compared to the second region of the barrier layer. - View Dependent Claims (33, 34, 35)
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Specification