Abstract: A breast pump shaped at least in part to fit inside a bra and comprising a housing including an aggregate, a breast shield element including a nipple tunnel adapted to receive a nipple, and a milk container adapted to contain a predetermined amount of expressed milk, wherein the breast shield element and the milk container are detachable from the housing. The present invention proposes an aggregate including a piston adapted to reciprocate within the housing, which piston moves the membrane. In the method expressed milk flows from a nipple chamber, which when the breast shield element is laid against a breast is defined in the nipple tunnel between a free end of the nipple tunnel and the breast, through the milk outlet valve into the pumping chamber and from the pumping chamber through the container valve into the milk chamber.

Abstract: A breast pump shaped at least in part to fit inside a bra and comprising a housing including an aggregate, a breast shield element including a nipple tunnel adapted to receive a nipple, and a milk container adapted to contain a predetermined amount of expressed milk, wherein the breast shield element and the milk container are detachable from the housing. The present invention proposes an aggregate including a piston adapted to reciprocate within the housing, which piston moves the membrane. In the method expressed milk flows from a nipple chamber, which when the breast shield element is laid against a breast is defined in the nipple tunnel between a free end of the nipple tunnel and the breast, through the milk outlet valve into the pumping chamber and from the pumping chamber through the container valve into the milk chamber.