The medical aspiration tool (1) is provided with: an outer tube (2) with a cylindrical body (21), a connecting section (22), and a flange (24) a gasket (4) that is held inside the outer tube and a gasket-operating member (3), which is attached to the gasket. The medical aspiration tool (1) is provided with a movement-restricting member (5), which is fitted on the flange (24) of the outer tube (2) and is for restricting the movement of the gasket-operating member (3) towards the tip. The gasket-operating member (3) is provided with: a body (30), which extends a specified length in the axial direction and can be inserted into the outer tube (2) a gasket-mounting section (33) that extends forward from the tip of the body and a grip (32), which is provided on the back end of the body (30) and cannot be inserted into the outer tube. The movement-restricting member (5) comprises a section that is fitted on the flange (24) and a protruding section (52) that covers a portion of the opening of the back end of the outer tube (2). The body (30) of the gasket-operating member (3) is provided with: during-rotation contacting sections that contact the protruding section (52) of the movement-restricting member (5) during rotation of the gasket-operating member (3) and protruding section-passing sections, which are provided on the tip of the body (30) and are capable of passing through the protruding section of the movement-restricting member.La présente invention concerne un outil (1) daspiration médicale comprenant : un tube externe (2) avec un corps cylindrique (21), une section de raccordement (22) et une collerette (24) un joint détanchéité (4) qui est retenu à lintérieur du tube externe et un élément (3) dactionnement de joint détanchéité, qui est fixé au joint détanchéité. Loutil (1) daspiration médicale comprend un élément (5) de restriction de déplacement, qui est adapté sur la collerette (24) du tube externe (2) et est destiné à restreindre le déplacement de lélément (3
