Abstract: An aspect of the present invention relates to a medical-insert guide (1) including a cylindrical component (2). The cylindrical component (2) is configured to be indwelled in a body from a nose or a mouth to an inside of a gastrointestinal tract, and has an inner cavity into which a medical insert can be removably inserted. A portion (23) of the cylindrical component (2) positioned at least at a pharynx and an upper esophageal sphincter when the cylindrical component is indwelled in the body, and an insertion-side front end portion (24) of the cylindrical component (2) each have flexibility that allows the cross-sectional shape of the portion to be deformed into a flat shape by pharynx pressure or esophageal pressure when the cylindrical component is indwelled in the body, or each preliminarily have a flat cross-sectional shape, and each have kink resistance.

Abstract: A double male connector (1) includes a first male luer (10) on one end and a second male luer (20) on the other end. The first male luer (10) and the second male luer (20) are in communication with each other. An outer circumferential surface of the first male luer (10) constitutes a first tapered surface (12) whose outer diameter decreases toward a leading end of the first male luer, and an outer circumferential surface of the second male luer (20) constitutes a second tapered surface (22) whose outer diameter decreases toward a leading end of the second male luer. A tubular portion (15) surrounds the first male luer (10). A female screw (16) is formed on an inner circumferential surface of the tubular portion (15).