Patent ID: 9220838
Filing Date: 2015-12-29
Classification: A61M

Abstract:
1. A puncture device comprising: a hollow needle possessing both a tip portion configured to puncture a living body and an elastic portion; a fixing portion fixed to a part of the hollow needle so that the part of the hollow needle is a fixed part of the hollow needle, the fixed part of the hollow needle being positioned on a side of the elastic portion opposite the tip portion so that the elastic portion is located axially between the tip portion and the fixed part; a sheath portion covering a part of or entirety of the hollow needle from the fixed part to the tip portion, the sheath portion including a plastically deformable elongating member, one end of the sheath portion being located closer to the fixing portion than the tip portion and being fixed to the hollow needle without any gap between an outer periphery of the hollow needle and an inner periphery of the sheath portion; a holding portion holding the hollow needle and the sheath portion in an integrated manner, the holding portion being positioned between the tip portion of the hollow needle and the plastically deformable elongating member; a holding release mechanism that releases the holding of the holding portion between the hollow needle and the sheath portion after the tip portion of the hollow needle and the sheath portion are punctured into the living body by moving the holding portion in a direction causing the elastic portion to extend; and wherein the sheath portion elongates and is held in an elongated condition when the holding portion moves by the holding release mechanism, or when the holding of the hollow needle using the holding portion in an integrated manner is released, and the elastic portion contracts.