Application of a therapeutic substance to a tissue location using an expandable medical device
First Claim
1. A radially expandable porous delivery device having a shaped form, comprising:
- a porous body constructed of fluoropolymer material, the fluoropolymer material having a microstructure of nodes interconnected by fibrils, the nodes having an internodal distance of about 10 μ
m to about 30 μ
m and oriented to create spaces between the nodes forming channels extending from an inner surface to an outer surface of the porous delivery device through which a fluid can flow;
a non-polymeric therapeutic coating disposed on the outer surface of the porous delivery device having a dynamic affinity for the delivery device as well as a targeted tissue location, such that the coating remains on the device during positioning of the delivery device;
an inflation fluid conduit disposed in the delivery device configured to supply an inflation fluid sufficient to provide an inflation fluid force to expand the porous body from a reduced diameter collapsed configuration to a pre-defined increased diameter expanded configuration;
wherein the microstructure of nodes interconnected by fibrils has a pre-determined porosity configured in part on fluid flow characteristics of the inflation fluid to cause the inflation fluid to weep through the channels at a rate substantially independent of the inflation fluid force; and
wherein the therapeutic coating is configured to release from the porous body upon action of the inflation fluid weeping through the porous body.
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Accused Products
Abstract
A non-polymeric or biological coating applied to radially expandable medical delivery device provides uniform drug distribution and permeation of the coating and any therapeutic agents mixed therewith into a targeted treatment area within the body. The delivery device is expanded using the pressure of an inflation fluid. After expanding the delivery device to a pre-determined size and shape, the inflation fluid weeps through the porous surface of the delivery device. The coating releases the delivery device and floats on the inflation fluid until bonding to the tissue due to its affinity for the tissue. Once the coating bonds or affixes to the tissue, through an absorption mechanism by the tissue cells of the coating material, the coating and any therapeutics contained therein are delivered to the tissue. The fluid can contain a therapeutic agent, or can be otherwise biocompatible and/or inert.
163 Citations
31 Claims
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1. A radially expandable porous delivery device having a shaped form, comprising:
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a porous body constructed of fluoropolymer material, the fluoropolymer material having a microstructure of nodes interconnected by fibrils, the nodes having an internodal distance of about 10 μ
m to about 30 μ
m and oriented to create spaces between the nodes forming channels extending from an inner surface to an outer surface of the porous delivery device through which a fluid can flow;a non-polymeric therapeutic coating disposed on the outer surface of the porous delivery device having a dynamic affinity for the delivery device as well as a targeted tissue location, such that the coating remains on the device during positioning of the delivery device; an inflation fluid conduit disposed in the delivery device configured to supply an inflation fluid sufficient to provide an inflation fluid force to expand the porous body from a reduced diameter collapsed configuration to a pre-defined increased diameter expanded configuration; wherein the microstructure of nodes interconnected by fibrils has a pre-determined porosity configured in part on fluid flow characteristics of the inflation fluid to cause the inflation fluid to weep through the channels at a rate substantially independent of the inflation fluid force; and wherein the therapeutic coating is configured to release from the porous body upon action of the inflation fluid weeping through the porous body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of applying a non-polymeric therapeutic coating to a targeted tissue location, comprising:
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obtaining a collapsible porous delivery device, the device formed of a collapsible and inflatable structure with porous walls adapted to inflate to a pre-determined maximum size and shape upon introduction of an inflation fluid into the device; applying the non-polymeric therapeutic coating to the delivery device, wherein the therapeutic coating has a dynamic affinity for the delivery device as well as a targeted tissue location, such that the coating remains on the device during positioning of the delivery device; positioning the delivery device proximal to a targeted tissue location within a patient; introducing the inflation fluid to the delivery device inflating the delivery device to the pre-determined maximum size and shape; and weeping the inflation fluid through the porous walls of the delivery device and introducing the inflation fluid between the delivery device and the therapeutic coating, thus initiating transfer and transferring at least a substantial portion of the therapeutic coating from the delivery device to the substantial portion of the targeted tissue location; wherein the substantial portion of the therapeutic coating contacts the targeted tissue location. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification