Fluid delivery apparatus
A fluid delivery device is disclosed. The fluid delivery device comprises a first driven element, a second driven element and a drive shaft rotatable about a rotational axis. The first driven element can be driven by the drive shaft when it rotates in a first rotational direction and not driven by the drive shaft when it rotates in a second rotational direction opposite to the first rotational direction. The second driven element can be driven by the drive shaft when it rotates in the second rotational direction and not driven by the drive shaft when it rotates in the first rotational direction. The first and second driven elements each have one of: a pump for pumping fluid, and a fluid path selector for selectively directing fluid between a selector port and one or more of a plurality of communication ports of the fluid path selector.
1 . A fluid delivery device comprising:
a first driven element;
a second driven element; and
a drive shaft,
the drive shaft being configured to be rotatably driven about a rotational axis,
the first driven element being configured to be driven by the drive shaft when the drive shaft rotates in a first rotational direction and not driven by the drive shaft when the drive shaft rotates in a second rotational direction opposite to the first rotational direction,
the second driven element configured to be driven by the drive shaft when the drive shaft rotates in the second rotational direction and not driven by the drive shaft when the drive shaft rotates in the first rotational direction,
wherein the first driven element and the second driven element each comprise one of:
a pump for pumping a fluid through the fluid delivery device, and
a fluid path selector for selectively directing fluid between a selector port and one or more of a plurality of communication ports of the fluid path selector,
wherein the second driven element comprises the fluid path selector.
2 . The fluid delivery device of claim 1 , wherein the fluid delivery device comprises a housing that supports the first driven element, the second driven element and the drive shaft.
3 . The fluid delivery device of claim 2 , wherein the fluid delivery device comprises a bearing configured to support the drive shaft in the housing, the bearing being located at a position along the rotational axis between the first driven element and the second driven element.
4 . The fluid delivery device of claim 1 , wherein at least one of the first driven element and the second driven element is driven by the drive shaft via a one-way drive transfer device.
5 . The fluid delivery device of claim 1 , wherein the first driven element comprises the pump.
6 . The fluid delivery device of claim 5 , wherein the pump is a peristaltic pump comprising a peristaltic tube, the peristaltic tube being disposed in a plane perpendicular to the rotational axis.
7 . The fluid delivery device of claim 1 , wherein the selector port and the plurality of communication ports of the fluid path selector are provided in fixed relation to a housing portion of the fluid delivery device.
8 . The fluid delivery device of claim 1 , wherein the plurality of communication ports comprises a first communication port and a second communication port, and wherein the fluid path selector comprises a moveable member configured to move relative to the plurality of communication ports between a first position configured to prevent fluid communication between the selector port and the second communication port, and a second position configured to prevent fluid communication between the selector port and the first communication port.
9 . The fluid delivery device of claim 8 , wherein the moveable member has a third position configured to provide fluid communication between the selector port and both the first communication port and the second communication port.
10 . The fluid delivery device of claim 8 , wherein the moveable member comprises a selection surface configured to interface with the plurality of communication ports, wherein the selection surface comprises:
an axial recess configured to align with the selector port; and
a radially-extending recess configured to selectively align with at least one of the plurality of communication ports.
11 . The fluid delivery device of claim 10 , wherein the radially-extending recess comprises a first channel and a second channel, wherein the first channel is configured to align with the first communication port and the second channel is configured to align with the second communication port.
12 . The fluid delivery device according to claim 1 , wherein the fluid delivery device comprises a motor configured to drive the drive shaft, and wherein the first driven element is disposed along the rotational axis between the motor and the second driven element.
13 . The fluid delivery device of claim 1 , wherein the first driven element comprises the pump and the second driven element comprises the fluid path selector, and wherein the fluid delivery device comprises a connecting channel configured to fluidly connect the pump and the selector port of the fluid path selector, such that the pump is operable to pump fluid between the selector port and the selected one or more of the plurality of communication ports.
14 . The fluid delivery device of claim 13 , wherein the connecting channel is, at least partially, external to the fluid delivery device.