Patent ID: 8936447
Filing Date: 2015-01-20
Classification: A61M

Abstract:
1. A cassette comprising: an interface element having a first position and a second position and a slot that is oriented perpendicular to a direction of linear motion of the interface element between the first and second positions; the interface element configured to be driven from the first position to the second position and back to the first position by unidirectional rotary motion of a driving element comprising an axis of rotation and a drive pin that is parallel to and offset from the axis of rotation and disposed within the slot such that the drive pin slides along a portion of the slot as the driving element rotates; a first and a second pumping chamber each having a volume and each coupled to the interface element such that the volume of the first pumping chamber is increasing while the volume of the second pumping chamber is decreasing as the interface element moves from the first position to the second position and the volume of the first pumping chamber is decreasing while the volume of the second pumping chamber is increasing as the interface element moves from the second position to the first position; an intake port and a delivery port; a first and a second inlet valve coupled between the intake port and the respective pumping chambers; and a first and a second outlet valve coupled between the respective pumping chambers and the delivery port, wherein the inlet valves and the outlet valves are configured to be actuated via one or more elements disposed on an actuator-facing surface of the cassette and to provide a continuous flow between the intake port and the delivery port.