Patent ID: 7029454

Claim:
A breast pump including a collection container, a milk expressing member attachable to said collection container, and a negative pressure source configured to produce a negative pressure such that a pressure is periodically pulsated at constant intervals between said negative pressure and atmospheric pressure; said milk expressing member is provided at an end thereof with a teat cup, at an opposite end thereof with a connector plug to said negative pressure source, and between said teat cup and said connector plug with a passageway to said collection container; a partition plate is arranged in said passageway to divide said milk expressing member into a space communicated to said teat cup and a space communicated to said connector plug; and a teat cup liner is replaceably fitted in said teat cup, wherein said teat cup liner is dimensioned to be brought into contact with an areola and nipple of a breast and has such flexibility and resiliency that said teat cup liner undergoes a deformation toward said teat cup when exposed to said negative pressure but restores to an initial shape thereof when exposed to said atmospheric pressure.