Systems and methods for expression of breast milk

1. An apparatus for expression of breast milk from a breast, the apparatus comprising:

a breast shield assembly comprising a breast interface and an actuatable assembly interface fluidly coupled with a tube, the breast interface configured to engage the breast and the actuatable assembly interface configured to removably couple to an actuatable assembly,

wherein the breast shield assembly comprises an enclosed fluid reservoir extending between the breast interface and the actuatable assembly interface, the fluid reservoir physically separated from the breast milk expressed from the breast and filled with a driving fluid comprising a liquid, and

wherein the breast shield assembly comprises a fill port configured to allow addition or removal of the driving fluid to or from the fluid reservoir,

a fill port plug configured to removably couple to the fill port so as to form a fluid-tight seal between the fill port plug and the fill port, wherein the fill port plug comprises a cover portion and a plug portion, the cover portion configured to extend over the fill port along an outer surface of the breast interface or the actuatable assembly interface, and the plug portion configured to fit through the fill port, wherein the cover portion has an outer diameter that is greater than a diameter of the fill port, wherein the plug portion comprises an intermediate portion sized to fit snugly within the fill port and form a fluid-tight seal against an inner wall of the fill port, and an annular lip having an outer diameter that is greater than an outer diameter of the intermediate portion and greater than the diameter of the fill port, wherein an inner surface of the plug portion defines a recessed central region surrounded by the annular lip, the recessed central region configured to allow the annular lip to flex radially outwards in response to inward pull forces exerted on the fill port plug.

2. An apparatus as in claim 1 , wherein the fluid reservoir comprises a first reservoir at the breast interface and a second reservoir at the actuatable assembly interface, the first reservoir and the second reservoir in fluid communication with one another via the tube.

3. An apparatus as in claim 1 , wherein the breast interface comprises the fill port.

4. An apparatus as in claim 3 , wherein the breast interface is shaped to form a first opening to receive the breast therethrough, a second opening to couple to a collection container, a third opening to couple to the tube, and a fourth opening defining the fill port.

5. An apparatus as in claim 4 , wherein the fill port is positioned at a portion of the breast interface that protrudes maximally in any one direction.

6. An apparatus as in claim 1 , wherein the actuatable assembly interface comprises the fill port.

7. An apparatus as in claim 1 , wherein the breast shield assembly comprises two or more fill ports, and wherein the breast interface comprises at least one of the two or more fill ports, and the actuatable assembly interface comprises at least one of the two or more fill ports.

8. An apparatus as in claim 1 , wherein the fill port plug is tethered to the breast shield assembly.

9. An apparatus as in claim 1 , wherein the fill port plug comprises a flexible material.

10. An apparatus as in claim 1 , further comprising an antimicrobial component in contact with the driving fluid, the antimicrobial component configured to reduce microbial growth in the driving fluid.

11. An apparatus as in claim 10 , wherein the antimicrobial component comprises a copper alloy, copper, brass, bronze, silver, an antimicrobial polymer, polymeric biocides, or a combination thereof.

12. An apparatus as in claim 10 , wherein the antimicrobial component is coupled to an inner surface of the tube.