Microneedle structure and biodegradable microneedle thereof
A microneedle structure and a biodegradable microneedle thereof are provided. The biodegradable microneedle defining a central axis includes a first step portion and a second step portion that is taperedly extending from the first step portion along the central axis. The biodegradable microneedle ha...
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Format: | Patent |
Sprache: | eng |
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