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Infusion systems (100) and related methods involving a catheter hub (102) and a male Luer connector (106) or a male closing cap (180) connectable to the catheter hub (102). The catheter hub (102) can be part of a catheter assembly (340) with a needle (342) and needle hub (344) and can include a valve (252), a valve opener (254), and a needle guard (366). The male Luer connector (106) can include a collar (108) that is fixed or rotatable relative to a male Luer tip (110). The collar (108) can have a conically shaped body. The catheter hub (102) can have a body having two centerlines that are angled to one another, or the male Luer connector (106) can have a body having two centerlines that are angled to another, or both the catheter hub (102) and the male Luer connector (106) each can have a body having two centerlines that are angled to one another. A support feature (146) can support the male Luer connector (106).

A bearing structure for a shielded electric pump includes: a rotating shaft (2) that rotates integrally with the rotor (12) of a motor unit (11); bearings (3a, 3b) that are embedded in a housing-side bearing housing (32a, 32b) provided in the pump unit (31) via an elastic thin plate (33), supporting the rotating shaft (2) in a vertical direction for free rotation; and bearing-supported members (4a, 4b) that are axially fixed between the rotor (12) of the motor unit (11) and the bearings (3a, 3b). The rotating shaft (2) is axially supported by bearings (3a, 3b) to be rotatable; and the impellers (6a, 6b) rotate integrally with the rotating shaft (2), and in a shielded electric pump (8) in which a portion of the liquid transported due to the rotation of the impellers (6a, 6b) flows between the rotating shaft (2) and the bearings (3a, 3b), an elastic reaction force is imparted axially when the bearings (3a, 3b) are pushed by the bearing-supported members (4a, 4b) to the side opposite to the rotor (12).