Development of blood extracting microneedle for blood multidiagnostic chip

Abstract

Blood extracting Microneedle has been studied for minimally invasive and rapid blood tests. However, in practical use of solid micro needles, the risk is concerned that microneedle can be easily broken due to the load of puncture and that of remaining broken needle in the subcutaneous. To solve the risk, this research has developed a blood extracting microneedle using biodegradable polymer. In this research, instead of the conventional hollow needle, we proposed the porous polymer needles to absorb blood. For the development of porous needles, experiments were conducted to determine suitable porosity. As a result, 60% or more of porosity is suitable for blood extracting and its minimum extracting speed is 1.75 μl/min.