Microneedle using bioabsorbable metal

Abstract

The present invention includes: a substrate portion; a needle portion provided at the substrate portion and protruding from the substrate portion to be inserted into skin; and a perforated portion provided at a junction between the needle portion and the substrate portion, wherein either of the substrate portion and the needle portion is made of the bioabsorbable metal.

1 . A microneedle using a bioabsorbable metal, the microneedle comprising:
 a substrate portion;   a needle portion provided at the substrate portion and protruding from the substrate portion to be inserted into skin; and   a perforated portion provided at a junction between the needle portion and the substrate portion,   wherein either of the substrate portion and the needle portion is made of the bioabsorbable metal.   
     
     
         2 . The microneedle of  claim 1 , wherein when the substrate portion is removed from the skin, the needle portion is separated from the substrate portion and thus remains in the skin. 
     
     
         3 . The microneedle of  claim 2 , wherein the needle portion includes:
 a needle cutout formed in the substrate portion;   a needle first portion connected at a first end thereof to the substrate portion while being received in the needle cutout; and   a needle second portion received in the needle cutout while being connected at a first end thereof with a second end of the needle first portion.   
     
     
         4 . The microneedle of  claim 3 , wherein the needle second portion is formed in a shape such that a width thereof gradually decreases from the first end to a second end thereof, the first end being larger than the needle first portion in width so as to have a barb formed thereat. 
     
     
         5 . The microneedle of  claim 4 , wherein when the substrate portion which has been in contact with the skin is removed from the skin, the barb becomes caught in subcutaneous tissue such that the first and needle second portions are embedded in the subcutaneous tissue. 
     
     
         6 . The microneedle of  claim 3 , wherein the perforated portion includes:
 multiple perforations provided at the first end of the needle first portion to be arranged along a transverse direction of the needle first portion at predetermined intervals.   
     
     
         7 . The microneedle of  claim 6 , wherein the perforated portion further includes:
 a notch, wherein   the notch is formed at the first end of the needle first portion to be positioned at opposite corners of the needle first portion in a width direction thereof, respective notches communicating with the needle cutout.   
     
     
         8 . The microneedle of  claim 3 , wherein either of the needle first portion and the needle second portion is provided with multiple drug carrying recesses formed on a peripheral surface thereof to be arranged along the peripheral surface of either of the needle first portion and the needle second portion. 
     
     
         9 . The microneedle of  claim 8 , wherein the drug carrying recesses are further provided on either of an upper surface and a lower surface of either of the needle first portion and the needle second portion. 
     
     
         10 . The microneedle of  claim 1 , wherein the bioabsorbable metal includes at least one of magnesium, calcium, zinc, and iron.