Patent ID: 8469985

Claim:
A puncture instrument comprising: a case; a needle assembly movably disposed in the case and comprising a needle having a sharp needle tip and a hub holding the needle; at least one arm having a first junction at one end thereof, joined to the hub by the first junction, and inclined from the first junction toward a proximal end of the case in an initial state; a support rod joined to the arm by a second junction at another end of the arm, extending from the second junction toward a distal end of the case, and having a distal end to be fixed to the case; and an abutting member movably disposed in the case, the needle assembly being movably held by the abutting member, the abutting member having an abutting portion for abutment against the skin, a distal end opening formed in the abutting portion for protruding the needle tip therethrough, and a fulcrum member disposed on an opposite side to the distal end opening, wherein when the abutting member is moved toward the proximal end of the case, the needle tip is protruded from the distal end opening, and the fulcrum member abuts against the arm to cause the arm to turn about the fulcrum member, thereby causing the arm to be inclined from the first junction toward the distal end of the case, and thereby to move the needle assembly toward the proximal end of the case to house the needle tip in the abutting member.