Implantable therapeutic device
First Claim
1. An ophthalmic drug delivery system comprising:
- an extended release device configured to be implanted in an eye, the device comprising;
a reservoir having a reservoir volume; and
a rigid porous structure coupled to the reservoir and having a release rate index (RRI)=PA/FL, where P is porosity corresponding to the percentage of void space of channels extending within the rigid porous structure, A is area, F is channel parameter, and L is thickness, the rigid porous structure having a plurality of irregularly shaped channels, the porous structure located at the outlet of the reservoir and tuned to release a predetermined rate profile of a drug formulation from the reservoir through the plurality of channels and into the eye to treat the eye for an extended period of time; and
a drug formulation contained in and delivered by the extended release device, wherein the drug formulation comprises a drug having a concentration in a solution volume and a given half-life upon bolus injection of the solution volume into an eye,wherein the extended release device is tuned to the drug formulation by selecting a value for at least one of the group consisting of;
the concentration, the reservoir volume, and the RRI, to achieve an effective half-life in the eye when the drug formulation is delivered by the implantable extended release device,wherein the effective half-life is longer than the given half-life; and
wherein the porosity P is between about 3% to about 70%, area A is between about 0.37 mm2 to about 16 mm2, channel parameter F is within a range of about 1.2 to 5.0 times the thickness of the porous structure, and thickness L is between about 0.029″
to about 0.049″
.
2 Assignments
0 Petitions
Accused Products
Abstract
A therapeutic device to release a therapeutic agent comprises a porous structure coupled to a container comprising a reservoir. The reservoir comprises a volume sized to release therapeutic amounts of the therapeutic agent for an extended time when coupled to the porous structure and implanted in the patient. The porous structure may comprise a first side coupled to the reservoir and a second side to couple to the patient to release the therapeutic agent. The length of the channels extending from the first side to the second side may comprise an effective length greater than a distance across the porous structure from the first side to the second side. The therapeutic device may comprise a penetrable barrier to inject therapeutic agent into the device when implanted in the patient.
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Citations
21 Claims
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1. An ophthalmic drug delivery system comprising:
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an extended release device configured to be implanted in an eye, the device comprising; a reservoir having a reservoir volume; and a rigid porous structure coupled to the reservoir and having a release rate index (RRI)=PA/FL, where P is porosity corresponding to the percentage of void space of channels extending within the rigid porous structure, A is area, F is channel parameter, and L is thickness, the rigid porous structure having a plurality of irregularly shaped channels, the porous structure located at the outlet of the reservoir and tuned to release a predetermined rate profile of a drug formulation from the reservoir through the plurality of channels and into the eye to treat the eye for an extended period of time; and a drug formulation contained in and delivered by the extended release device, wherein the drug formulation comprises a drug having a concentration in a solution volume and a given half-life upon bolus injection of the solution volume into an eye, wherein the extended release device is tuned to the drug formulation by selecting a value for at least one of the group consisting of;
the concentration, the reservoir volume, and the RRI, to achieve an effective half-life in the eye when the drug formulation is delivered by the implantable extended release device,wherein the effective half-life is longer than the given half-life; and wherein the porosity P is between about 3% to about 70%, area A is between about 0.37 mm2 to about 16 mm2, channel parameter F is within a range of about 1.2 to 5.0 times the thickness of the porous structure, and thickness L is between about 0.029″
to about 0.049″
. - 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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Specification