Infusion and transfusion apparatus probe - has wedge-section vent valve with tapering portion closing opening

摘要

The probe has a liquid passage and a venting passage with an opening to atmosphere, closed by a valve of elastic material opening in the venting direction. The valve (9) consists of a wedge-section piece, bearing against the opening (5) with its tapering portion (14) under its inherent tension. The tapering portion can extend upwards, and the vent passage (2) can end below the opening closed by the valve, which can be cylindrical, with a sealing ring (10) separating the liquid chamber (4) from the air chamber. The valve can also have a thickened external annular portion (19).