BREAST PUMP Russian patent published in 2018 - IPC A61M1/06 

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment. Breast pump contains a chamber, a membrane and a limiter in the chamber to limit the membrane deformation. Membrane is placed in the chamber for dividing the chamber into the first and a second spaces and is able to deform in the chamber in response to a pressure reduction in the first space to create a pressure reduction in the second space. Membrane can freely deform in the chamber between the neutral state, in which the membrane is spaced from the limiter, and a working state in which a certain reduction in pressure is transferred to the membrane from the first chamber space. Limiter is configured so that the membrane is placed on the limiter to limit the deformation of the membrane in the chamber when the pressure decrease in the second space is equal to or greater than the threshold value, to limit the pressure drop in the second space. Chamber surface in contact with the membrane and / or the surface of the membrane in contact with the chamber has a textured finish of the surface with an average arithmetic mean value of the roughness profile (Ra) between Ra 0.4 mcm and Ra 3.2 mcm, so that the noise level created when the membrane comes into contact with the chamber, moves over it or from it, is minimized. Disclosed is a breast pump system containing a breast pump and a working unit with a vacuum pump.

EFFECT: technical result consists in reduction of operational noise level.

12 cl, 8 dwg