Microneedle device
First Claim
1. A microneedle device comprising a microneedle array provided with microneedles made from polylactic acid having a weight average molecular weight of 40,000 or more, wherein at least a part of the microneedle array is coated with a carrier containing a physiologically active ingredient and the viscosity of the carrier is 100 cps to 100000 cps;
- and wherein the weight average molecular weight is a weight average molecular weight after sterilization by electron-beam or gamma-ray irradiation.
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Accused Products
Abstract
Provided is a microneedle device where a coating agent has been applied to microneedles having a biodegradable resin. It has been found that the application of the coating agent to microneedles of a biodegradable resin having a predetermined strength allows the microneedles to have excellent performance. Further, with regard to the coating agent, a predetermined type and amount thereof are also useful to demonstrate performance. Accordingly, when a microneedle device 1 is arranged so that at least a part of a microneedle array 2 provided with microneedles 3 made from polylactic acid having a weight average molecular weight of 40,000 or more is coated with a carrier containing physiologically active ingredients, it is possible to attain excellent migration characteristics of the physiologically active ingredients to a living body.
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Citations
7 Claims
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1. A microneedle device comprising a microneedle array provided with microneedles made from polylactic acid having a weight average molecular weight of 40,000 or more, wherein at least a part of the microneedle array is coated with a carrier containing a physiologically active ingredient and the viscosity of the carrier is 100 cps to 100000 cps;
- and wherein the weight average molecular weight is a weight average molecular weight after sterilization by electron-beam or gamma-ray irradiation.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification