Reversible gel-forming composition for sustained delivery of bio-affecting substances, and method of use
First Claim
1. A reversibly gelling composition for sustained delivery of a therapeutic or diagnostic agent, said composition exhibiting a reversible increase in viscosity in response to variation in pH over a pre-determined range, said composition comprising an aqueous solution including about 0.01% to 10.0% (w/w) of at least one pharmaceutically acceptable pH-responsive gelling polymer and about 0.01% to 20.0% (w/w) of at least one other pharmaceutically acceptable thermally nonresponsive polymer.
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Abstract
Reversibly gel-forming compositions for sustained delivery of bio-affecting substances are disclosed. The compositions exhibit significant changes in viscosity in response to changes in pH. The compositions contain relatively low concentrations of a stable combination of at least one pH-responsive gelling polymer and at least one other thermally nonresponsive polymer. The compositions are preferably formulated to include one or more therapeutic or diagnostic agents for administration as a liquid that will gel in situ or for topical application as a pre-formed gel.
104 Citations
22 Claims
- 1. A reversibly gelling composition for sustained delivery of a therapeutic or diagnostic agent, said composition exhibiting a reversible increase in viscosity in response to variation in pH over a pre-determined range, said composition comprising an aqueous solution including about 0.01% to 10.0% (w/w) of at least one pharmaceutically acceptable pH-responsive gelling polymer and about 0.01% to 20.0% (w/w) of at least one other pharmaceutically acceptable thermally nonresponsive polymer.
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16. A pharmaceutical composition that includes:
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a) a pH-responsive reversibly gelling delivery vehicle comprising an aqueous solution including about 0.01% to 10.0% (w/w) of at least one pharmaceutically acceptable pH-responsive gelling polymer and about 0.01% to 20.0% (w/w) of at least one other pharmaceutically acceptable thermally nonresponsive polymer; and b) an effective amount of a therapeutic or diagnostic agent. - View Dependent Claims (17, 18, 19, 20)
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- 21. A method for sustained delivery of a therapeutic or diagnostic agent to a patient, said method comprising administering to said patient a pharmaceutical composition that includes an effective amount of said therapeutic or diagnostic agent, disposed within a pH-responsive reversibly gelling delivery vehicle comprising an aqueous solution including about 0.01% to 10.0% (w/w) of at least one pharmaceutically acceptable pH-responsive gelling polymer and about 0.01% to 20.0% (w/w) of at least one other pharmaceutically acceptable thermally nonresponsive polymer.
Specification