Delivery system comprising means for controlling internal pressure
First Claim
1. An improved delivery system for administering a beneficial agent to an environment of use, the delivery system comprising:
- i) a wall that surrounds a lumen, the wall comprising in at least a part a semipermeable composition,ii) a thermo-responsive composition in the lumen that forms a dispensable formulation at the temperature of the environment of use,iii) a beneficial agent mixed with the thermo-responsive composition,iv) an expandable driving member in the lumen for displacing the thermo-responsive composition from the delivery system, andv) an exit opening in the wall that communicates with the lumen;
wherein, the improvement comprises;
a) a viscosity-inducing amount of an inert viscosity-inducing agent in the thermo-responsive composition for increasing the viscosity of the thermo-responsive composition, andb) a pressure-inducing exit member in the exit opening in the wall for increasing the pressure inside the lumen, the exit member having from 1 to exit ports or passageways;
wherein the delivery system when in operation develops an internal pressure such that the pressure differential generated by the thermo-responsive composition and the exit member is greater than 1.5 psi.
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Abstract
The present invention is directed to an improvement in a delivery system, the system comprising a wall that surrounds an internal lumen or compartment which contains a thermo-responsive beneficial agent formulation, an expandable driving member and an optional density member, and having an exit opening, and wherein the improvement comprises a) a viscosity-inducing amount of an inert viscosity-inducing agent in the thermo-responsive beneficial agent composition for increasing the viscosity of the beneficial agent composition, and/or b) a pressure-inducing exit member in the exit opening in the wall for increasing the pressure inside the lumen.
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Citations
29 Claims
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1. An improved delivery system for administering a beneficial agent to an environment of use, the delivery system comprising:
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i) a wall that surrounds a lumen, the wall comprising in at least a part a semipermeable composition, ii) a thermo-responsive composition in the lumen that forms a dispensable formulation at the temperature of the environment of use, iii) a beneficial agent mixed with the thermo-responsive composition, iv) an expandable driving member in the lumen for displacing the thermo-responsive composition from the delivery system, and v) an exit opening in the wall that communicates with the lumen; wherein, the improvement comprises; a) a viscosity-inducing amount of an inert viscosity-inducing agent in the thermo-responsive composition for increasing the viscosity of the thermo-responsive composition, and b) a pressure-inducing exit member in the exit opening in the wall for increasing the pressure inside the lumen, the exit member having from 1 to exit ports or passageways;
wherein the delivery system when in operation develops an internal pressure such that the pressure differential generated by the thermo-responsive composition and the exit member is greater than 1.5 psi. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An improved delivery system for administering a beneficial agent to an environment of use, the delivery system comprising:
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i) a wall that surrounds a lumen, ii) a thermo-responsive composition in the lumen, iii) a beneficial agent mixed with the thermo-responsive composition, iv) an expandable driving member in the lumen for displacing the thermo-responsive composition from the dispenser, and v) an exit opening in the wall that communicates with the lumen; wherein, the improvement comprises; a) a viscosity-inducing amount of an inert viscosity-inducing agent mixed into the thermo-responsive composition for increasing the viscosity of the thermo-responsive composition to increase the internal pressure of the dispenser;
wherein the delivery system when in operation develops an internal pressure such that the pressure differential generated by the thermo-responsive composition and the exit opening is greater than 1.5 psi. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An improved delivery system for administering a beneficial agent to an environment of use, the delivery system comprising:
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i) a wall that surrounds a lumen, ii) a thermo-responsive composition in the lumen, iii) a beneficial agent mixed with the thermo-responsive composition, iv) an expandable driving member in the lumen for displacing the thermo-responsive composition from the dispenser, and v) an exit opening in the wall that communicates with the lumen; wherein, the improvement comprises; a) a pressure-inducing exit member in the exit opening in the wall for increasing the pressure inside the lumen, the exit member having from 1 to 200 exit ports or passageways;
wherein the delivery system when in operation develops an internal pressure such that the pressure differential generated by the thermo-responsive composition and the exit member is greater than 1.5 psi. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification