Abstract: A medical connector includes a tubular male connector unit, an engaging unit arranged on an outer side of the male connector unit in a radial direction of the male connector unit, at least a part of the engaging unit being elastically deformable inward in the radial direction, a locking unit movable between a first position and a second position in which at least a part of the engaging unit is elastically deformed inward in the radial direction relative to the first position, and a blocking mechanism configured to block the locking unit from moving from the first position to the second position in a predetermined state.

Abstract: A medical connector includes a medical device connection portion communication passage defined by a housing and a valve body to guide a fluid from a first medical device connection portion to a second medical device connection portion. In the medical connector, a male connector inserted into the a connector connection portion presses a head portion of the valve body while contracting and deforming a body portion, and a fluid is guided from the male connector connection portion to the medical device connection portion communication passage, through a gap formed between the head portion and the housing.

Abstract: A method includes: providing an assembly including: an inner needle, an inner needle hub, a catheter, a catheter hub, a catheter operation member, and a support member; puncturing a blood vessel of a patient with the inner needle and the catheter, while the support member is at a first position in which the support member supports the catheter; advancing the catheter operation member relative to the needle hub such that the catheter advances in the blood vessel, such that a part of the support member is caused to deform relative to the needle hub as the support member moves from the first position to a second position in which the support member does not support the catheter, and such that the catheter hub detaches from the needle hub; and retracting the inner needle hub and the inner needle relative to the catheter hub and the catheter.