Patent ID: 8679144
Filing Date: 2014-03-25
Classification: A61B

Abstract:
1. A puncture needle cartridge for detachably mounting on a puncturing device body to form a puncturing device, the puncture needle cartridge comprising: a needle body having a puncturing portion and a pair of engaging portions, each of the engaging portions having a tapered inclined surface; a casing for housing the needle body, the casing having a pair of flexible members, and the casing having openings that are respectively formed in front of and behind the needle body; the needle body being mounted to be movable between a retracted position, wherein a tip of the puncturing portion is retracted in the casing, and an extended position, wherein the tip of the puncturing portion is projected outward from the casing, by receiving a pressing force from the puncturing device body, wherein the pair of flexible members are on opposite sides of the needle body to bias the needle body from the extended position towards the retracted position, a first end of each flexible member being fixed to an inner surface of the casing, and a second end of each flexible member being configured to slide in contact with a corresponding engaging portion, wherein a circular arc shaped abutment portion formed at a tip of each flexible member contacts a corresponding engaging portion from among the pair of engaging portions, the corresponding engaging portion being linear in plan view, wherein the second end of each flexible member is engaged with the needle body, and wherein each flexible member is curved to project backward.