Micro-needle array comprising a color change indicator

1. A microneedle array for use with intradermal delivery, comprising a plurality of microneedles on a carrier, wherein the microneedles comprise at least one color change indicator, the microneedles comprising at least one active ingredient and the microneedles comprising at least one polymer made of biodegradable polymers, biocompatible polymers or water-soluble polymers, a color change or color shift indicating a sufficient penetration depth into the stratum corneum, wherein the color change indicator is an integral part of the microneedles, the at least one color change indicator being introduced or incorporated into the microneedles and wherein the color change indicator is a compound selected from chromoionophores or fluoroionophores, the compound being composed of at least one ionophore covalently bound to at least one molecule, which is selected from chromophores and fluorophores.

2. The microneedle array for use according to claim 1 , wherein the color change indicator is added during the production of the microneedles.

3. The microneedle array for use according to claim 2 , wherein the microneedles comprise a medicinal drug.

4. The microneedle array for use according to claim 1 , wherein the chromophores or fluorophores are selected from the neutral, acidic or basic nitrated benzene dyes, neutral, acidic or basic azo dyes, quinone dyes.

5. The microneedle array according to claim 1 , wherein the color change indicator is ink.

6. The microneedle array according to claim 1 , wherein the color change indicator detects endogenous enzymes.

7. The microneedle array for use according to claim 1 , wherein the color change indicator is included in a tip of the microneedles.

8. The microneedle array for use according to claim 1 , wherein the microneedle array comprises fixation means.

9. The microneedle array for use according to claim 1 , wherein the microneedle array is accommodated in a microneedle system and comprises at least one reservoir and/or applicator.

10. The microneedle array for use according to claim 1 , wherein the chromophores or fluorophores are neutral, acidic or basic methines, azomethines, triarylmethane dyes, indoamine dyes, natural dyes, or direct dyes thereof.

11. The microneedle array according to claim 1 , wherein the color change indicator is biosensing ink.

12. The microneedle array according to claim 1 , wherein the color change indicator is configured to detect peroxidases, which do not form part of the epidermis, by means of benzidines or phthalazines.

13. A microneedle array for use with intradermal delivery, comprising a plurality of microneedles on a carrier, wherein the microneedles comprise at least one color change indicator which is a biosensing ink, the microneedles comprising at least one active ingredient and the microneedles comprising at least one polymer made of biodegradable polymers, biocompatible polymers or water-soluble polymers, a color change or color shift indicating a sufficient penetration depth into the stratum corneum, wherein the color change indicator is an integral part of the microneedles, the at least one color change indicator being introduced or incorporated into the microneedles.

14. The microneedle array for use according to claim 13 , wherein the color change indicator is added during the production of the microneedles.

15. A microneedle array for use with intradermal delivery, comprising a plurality of microneedles on a carrier, wherein the microneedles comprise at least one color change indicator, the microneedles comprising at least one active ingredient and the microneedles comprising at least one polymer made of biodegradable polymers, biocompatible polymers or water-soluble polymers, a color change or color shift indicating a sufficient penetration depth into the stratum corneum, wherein the color change indicator is an integral part of the microneedles, the at least one color change indicator being introduced or incorporated into the microneedles and wherein the color change indicator is configured to detect peroxidases, which do not form part of the epidermis, by means of benzidines or phthalazines.