Cassette for receiving aspirated fluids

Abstract

A cassette for collection of fluids in a fluid aspirating system which may be reusable after sterilization. The cassette includes vacuum aperture and an aspiration port along the top wall of the cassette. Aspiration tubing is connected to the aspiration port at one end and is seated within an upstanding retainer at the proximal edge of the top wall at the opposite end. Internally, the cassette includes structures to increase flow impedance so that liquid is not drawn into the vacuum port when the fluid level rises. In addition, a pivot mechanism is disposed about a pivot hub within the chamber. A float is disposed on the pivot mechanism at a radius from the pivot hub for intercepting the vacuum port as aspirated fluid fills the chamber. As the fluid level rises, a light path is intercepted by the float to terminate aspiration. However, the float also mates with the vacuum port to close off the flow path. Thus, the system prevents overfilling of the container if the optical detector fails. So that filling of the cassette can be anticipated, a float space containing a second float is located along the proximal edge of the cassette. Finally, the bottom wall section includes a sterilization port which allows a cleaning system to inject a presterilizing fluid through the interior of the cassette to thereby cleanse all parts of the unit.