Patent ID: 9693803
Date: 2017-07-04
CPC Classifications: A61B

Claim:
1. A puncture needle that is used with an endoscope having a channel through which a medical instrument is inserted and a bending section configured to bend the medical instrument in the channel, the puncture needle being configured to be inserted through the channel as the medical instrument, the puncture needle comprising: a flexible sheath having a longitudinal axis and deformed to be bent by the bending section; a flexible needle tube having a needle tip section and an opening section formed in the needle tip section, and movable in the sheath with respect to the sheath; a stylet having a distal end surface that is configured to advance and retreat in the needle tube along the longitudinal axis of the sheath, and to protrude from and withdraw into the needle tube, and that is configured to be positioned with respect to the needle tube in a state in which the distal end surface protrudes from the opening section of the needle tube; a manipulation section attached to the sheath and configured to advance and retract the needle tube with respect to the sheath; and a positioning mechanism installed at the manipulation section and configured to hold the stylet with respect to the needle tube at a position at which the distal end surface of the stylet protrudes from the opening section of the needle tube, wherein, in a state in which the puncture needle for the endoscope is disposed in the channel, when the distal end surface of the stylet is pressed from an inner surface of the sheath bent by the bending section, a needle tip of the needle tube is moved away from an inner surface of the sheath in a state in which the distal end surface of the stylet is positioned by the positioning mechanism with respect to the needle tube.