Breast pump and breast pump valve assembly

A breast pump valve assembly comprising:

• a variable volume second chamber defined between a first one-way valve and a second one-way valve, wherein the first one-way valve is configured to allow flow of fluid into the second chamber and the second one-way valve is configured to allow flow of fluid out of the second chamber,
• a third valve is configured to provide a selectively openable fluid flow path between the second chamber and an ambient atmosphere;
• and
• a displacement member configured for varying the volume of the second chamber, wherein the displacement member is configured such that a first movement of the displacement member to increase the volume of the second chamber thereby draws fluid into the second chamber through the first one-way valve;
• wherein the third valve is configured to be selectively opened in response to a second movement of the displacement member, thereby directing fluid from the chamber through the third valve.

A breast pump comprising:

• a first chamber and a vacuum port for fluidly connecting the first chamber to a negative pressure source;
• a breast receiving part, a fluid collection container, and a fluid flow path extending between the breast receiving part and the fluid collection container;
• a second chamber defined between a first one-way valve and a second one-way valve in the fluid flow path, wherein the first one-way valve is configured to allow flow of fluid from the breast receiving part into the second chamber, and the second one-way valve is configured to allow flow of fluid from the second chamber to the fluid collection container,
• a fluid flow path between the second chamber and an ambient atmosphere, the fluid flow path comprising a selectively openable third valve;
• and
• a displacement member fluidly separating the first chamber and the second chamber, wherein the displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member to thereby increase the volume of the second chamber and draw fluid from the breast receiving part through the first one-way valve into the second chamber wherein the displacement member is configured such that, increase of pressure in the first chamber towards atmospheric pressure causes a second movement of the displacement member to thereby decrease the volume of the second chamber;
• and
• wherein the third valve is configured to be selectively openable in response to the second movement of the displacement member, thereby directing fluid from the second chamber through the third valve.