INFUSION APPARATUS

A gas trap apparatus (100) is for medical fluids, such as in infusion systems. The apparatus has a chamber (101), an inlet (103) to the bubble entrapment chamber with multiple of inlet ports (104, 105), and an outlet with at least one outlet port (110). The ports and the chamber are arranged to allow mixing of gases from the different fluids and which are trapped in the chamber. The inlet ports merge at a confluence space and the chamber comprises a diffuser with apertures (107) around an inflow tube for inflow of fluids into the chamber with a lateral dimensional component. Where the inlet ports (104, 105) have a diameter in the range of 1.5 mm to 8.0 mm, and the distance between an upper end of a confluence space between the ports (104, 105) and the diffuser apertures (107) is no more than 20 mm. This promotes turbulence as the fluids mix, and this turbulence continues through the diffuser, thereby enhancing bubble formation and hence migration of the gas as bubbles away from the outlet, towards an upper end of the chamber in use.