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Claims for Patent: 8,246,980

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Claims for Patent: 8,246,980

Title:Transdermal delivery system
Abstract: An improved transdermal delivery system (TDS) comprises a self-adhesive matrix comprising a solid or semi-solid semi-permeable polymer which contains an amine-functional drug in its free base form as a multitude of microreservoirs within the matrix. The self-adhesive matrix is highly permeable to the free base of the amine-functional drug and is impermeable to the protonated form of the amine-functional drug.
Inventor(s): Schacht; Dietrich Wilhelm (Koln, DE), Hannay; Mike (Wachtberg-Villiprott, DE), Wolff; Hans-Michael (Monheim, DE)
Assignee: UCB Pharma GmbH (Monheim, DE)
Application Number:10/627,990
Patent Claims: 1. A transdermal delivery system (TDS) comprising a self-adhesive matrix containing a self-adhesive polymer and microreservoirs containing an amine-functional drug in free base form selected from the group consisting of fentanyl and oxybutynin, wherein the microreservoirs are within the self-adhesive matrix and have a maximum diameter less than the thickness of the self-adhesive matrix; and wherein the self-adhesive matrix is permeable to the amine-functional drug in free base form, and the self-adhesive matrix is substantially impermeable to the amine functional drug in protonated form.

2. The TDS of claim 1, wherein the mean diameter of the microreservoirs is in the range of 0.5 to 20 .mu.m.

3. The TDS of claim 1, wherein the self-adhesive matrix is free of silica particles that can absorb salts of the amine functional drug at the TDS/skin interface.

4. The TDS of claim 1, wherein the self-adhesive matrix comprises a silicone pressure sensitive adhesive.

5. The TDS of claim 1, wherein the self-adhesive matrix comprises two or more silicone pressure sensitive adhesives.

6. The TDS of claim 5, wherein the silicone pressure sensitive adhesive is a blend of a high tack silicone pressure sensitive adhesive comprising polysiloxane with a resin and a medium tack silicone pressure sensitive adhesive comprising polysiloxane with a resin.

7. The TDS of claim 1, wherein the microreservoirs further contain at least one crystallization inhibitor comprising soluble polyvinylpyrrolidone, a copolymer of polyvinylpyrrolidone and vinyl acetate, polyethylene glycol, polypropylene glycol, glycerol, a fatty acid ester of glycerol and/or a copolymer of ethylene and vinyl acetate.

8. The TDS of claim 7, wherein the at least one crystallization inhibitor comprises soluble polyvinylpyrrolidone.

9. The TDS of claim 1, wherein the self-adhesive matrix contains 10.sup.3 to 10.sup.9 microreservoirs per cm.sup.2 of the surface of the matrix.

10. The TDS of claim 1, wherein the maximum diameter of the microreservoirs is not greater than 35 .mu.m.

11. The TDS of claim 1, further comprising a protective foil or sheet to be removed prior to use.

12. The TDS of claim 1, further comprising a backing layer.

13. The TDS of claim 12, wherein the backing layer is inert to the components of the matrix.

14. The TDS of claim 1, wherein the self-adhesive matrix comprises a solid or semisolid semi-permeable polymer.

15. The TDS of claim 1, wherein the self-adhesive matrix contains 10.sup.6 to 10.sup.9 microreservoirs per cm.sup.2 of the surface of the matrix.

16. The TDS of claim 1, further comprising a backing layer being inert to the component of the matrix, and a protective foil or sheet to be removed prior to use, wherein the matrix contains 10.sup.3 to 10.sup.9 microreservoirs per cm.sup.2 of the surface of the matrix, and wherein the maximum diameter of the microreservoirs is less than the thickness of the matrix and is not greater than 35 .mu.m.

17. A transdermal delivery system (TDS) comprising a self-adhesive matrix containing a self-adhesive polymer and microreservoirs containing an amine-functional drug in free base form selected from the group consisting of aminotetralin compounds, wherein the microreservoirs are within the self-adhesive matrix and have a maximum diameter less than the thickness of the self-adhesive matrix; and wherein the self-adhesive matrix is permeable to the amine-functional drug in free base form, and the self-adhesive matrix is substantially impermeable to the amine functional drug in protonated form.
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