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An electrical breast pump may include a permanently unobstructed continuous passageway across the diaphragm and a rolling diaphragm that is movable between a vent orientation and a vacuum orientation, or a vent piston configured to actuate a closure between a vent orientation and a vacuum orientatio

An electrical breast pump may include a permanently unobstructed continuous passageway across the diaphragm and a rolling diaphragm that is movable between a vent orientation and a vacuum orientation, or a vent piston configured to actuate a closure between a vent orientation and a vacuum orientation so that a pressure chamber is selectively in direct communication with atmospheric pressure.

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1. A breast pump assembly comprising: a housing assembly including a piston housing and a drive housing having an opening in direct communication with atmospheric pressure;a piston assembly including a vent piston and a drive piston, the vent piston having a top wall and a channel defined by the top

1. A breast pump assembly comprising: a housing assembly including a piston housing and a drive housing having an opening in direct communication with atmospheric pressure;a piston assembly including a vent piston and a drive piston, the vent piston having a top wall and a channel defined by the top wall, a side wall and a center post where a vent is defined to extend through the side wall in communication with the channel, the drive piston having a top wall with a vent passage defined therethrough;a rolling diaphragm including an outer end, an outer margin disposed adjacent the outer end, where both of the outer end and outer margin are sealingly captured between the piston housing and the drive housing, an inner end, and an inner margin disposed adjacent the inner end, where the inner margin is sealingly captured between the vent piston and the drive piston to cooperatively define a pressure chamber between the diaphragm, piston housing and vent piston; anda permanently unobstructed continuous passageway across the diaphragm that is disposed at atmospheric pressure defined by the vent in direct communication with the channel, the channel in direct communication with a portion of the inner end that is spaced from the center post, and the vent passage in direct communication with the inner end portion and the opening, wherein the diaphragm is movable between a vacuum orientation and a vent orientation in response to cyclic movement of the piston assembly, such that the vacuum orientation is defined when an outer opening of the vent is sealed by the diaphragm, and the vent orientation is defined when the outer opening of the vent is uncovered by the diaphragm so that the pressure chamber is in direct communication with atmospheric pressure via the permanently unobstructed continuous passageway across the diaphragm, and wherein the diaphragm is disposed in the vent orientation between 15% and 60% of each cycle of the piston assembly. 2. The breast pump assembly of claim 1, wherein the portion is the entirety of the inner end. 3. The breast pump assembly of claim 1, wherein the portion is defined by the inner end having a crenelated contour. 4. The breast pump assembly of claim 2, wherein a plurality of ribs extend from the center post to engage the inner end. 5. The breast pump assembly of claim 1, wherein the center post has a recess formed over a section adjacent the inner end. 6. The breast pump assembly of claim 1, wherein the vent piston includes a projection extending from the side wall into contact with the drive piston such that the portion engages the projection. 7. The breast pump assembly of claim 2, wherein the vent piston includes a projection extending from the side wall into contact with the drive piston such that the inner edge engages the projection. 8. The breast pump assembly of claim 1, wherein the drive piston includes an extension that projects from the top wall into contact with the vent piston such that the portion engages the extension. 9. The breast pump assembly of claim 2, wherein the drive piston includes an extension that projects from the top wall into contact with the vent piston such that the inner edge engages the extension. 10. The breast pump assembly of claim 1, wherein an insert is disposed between the drive piston and the vent piston such that the portion engages the insert. 11. The breast pump assembly of claim 2, wherein the an insert is disposed between the drive piston and the vent piston such that the inner edge engages the insert.