Patent ID: 7632253
Filing Date: 2009-12-15
Classification: A61M

Abstract:
1. An injection needle to be attached to a liquid injection port formed on the distal end of a liquid container that contains insulin solution or dental drug as a liquid, comprising: a puncturing needle part having a puncturing part capable of puncturing a body, a portion of said puncturing part having an outer diameter which continuously or stepwise reduces towards the distal end; a liquid introducing needle part capable of communicating with the inside of a liquid container, said puncturing needle part and said liquid introducing needle part constituting a single needle body, said puncturing needle part having an intermediate part formed between said puncturing part and said liquid introducing needle part and connecting them smoothly by changing its diameter continuously; and a housing that supports said puncturing needle part and said liquid introducing needle part in such a way as to allow the liquid to flow between the two needle parts, the housing including a bottom wall wherein; said puncturing part has an inner diameter in the range of 0.05 mm-0.15 mm; said puncturing needle part has a length extending distally from a distally facing surface of the bottom wall of the housing that is in a range of 0.2 mm-15 mm; said liquid introducing needle part has a larger outer diameter than at least the vicinity of the distal end of said puncturing part; the distal end of said puncturing part possessing an outer diameter in the range of 0.10 mm-0.254 mm; and the liquid introducing needle part extending proximally from a proximally facing surface of the bottom wall; a cutting edge is formed at the end of said liquid introducing needle part for penetrating through an elastic member that is provided to seal the liquid injection port.