Adapter with media separating diaphragm for a breast shield

A media separating diaphragm of an adapter for a breast shield of a breast pump for expressing human breast milk, wherein the breast shield is one of holdable in the adapter or integrally connected in one piece to said adapter,

• wherein the adapter comprises a suction connection for connection to a vacuum pump and a milk connection for connection to a milk collecting container,
• wherein the adapter comprises a chamber from which the suction connection and a milk outlet opening lead,
• wherein the chamber additionally comprises an opening on the breast shield side which leads to the breast shield having a first diameter and an opening which is remote from the breast shield having a second diameter,
• and wherein the adapter additionally comprises a flexible media separating diaphragm which is received in the chamber and separates the chamber into a pump-side region and a breast-shield-side region for the purposes of transmitting a negative pressure generated by the vacuum pump into the breast shield and for the purposes of protecting against contamination of the vacuum pump,
• wherein the chamber tapers toward the opening on the breast shield side
• wherein the chamber comprises the form of a spherical calotte which has been cut off in its tapering region,
• wherein the media separating diaphragm comprises substantially the form of a flattened spherical calotte with an even top surface and
• wherein the even top surface of the media separating diaphragm faces the opening of the chamber on the breast shield side.