Patent ID: 8162883
Filing Date: 2012-04-24
Classification: A61M

Abstract:
1. A puncture needle assembly comprising: a needle tube having a sharp needle point at a distal end thereof; a body including a tubular body section in which the needle tube is partially inserted, a hub to which a base end portion of the needle tube is fixed and which is provided at a base end portion of the tubular body section, and an elastic deformable section provided on a distal end side relative to the base end portion of the tubular body section; a protector supported on the body so as to be capable of moving along an axial direction of the needle tube between a first position at which the protector covers at least the needle point of the needle tube, and a second position at which the needle point is exposed and which is on a base end side relative to the first position, the protector having an engaging section engaging with the elastic deformable section when the protector is in the first position; an engagement preventing member which, when the protector moves from the first position to the second position, makes contact with the engaging section to exhibit an engagement preventing function, and which permits the engaging section to move past the elastic deformable section without engaging with the elastic deformable section; and biasing means biasing the protector in a direction from the second position toward the first position, wherein the protector is biased by a biasing force of the biasing means to move to the first position when the protector is pushed to move from the first position to the second position against the biasing force of the biasing means and then pushing thereof is released, and when it is attempted to thereafter move the protector in the first position toward the second position, the engagement preventing function of the engagement preventing member is not exhibited and the engaging section engages with the elastic deformable section, thereby preventing the protector from moving toward the second position side, wherein the engagement preventing member is mounted on the protector, and when the protector moves from the first position to the second position, the engagement preventing member moves together with the protector so as to move past the elastic deformable section, and wherein when the protector is in the first position, a distal portion of the elastic deformable section is located at an intermediate portion of the engagement preventing member, in a condition where the engagement preventing member is mounted on the protector.