An adapter for a breast shield (1) of a breast pump for expressing human breast milk comprises a chamber (280) with a first opening (282) which leads to the breast shield (1) and a second opening (283) which is remote from the breast shield. The adapter (2) additionally comprises a flexible media separating diaphragm (4) which is received in the chamber (280) and separates the chamber (280) into a pump-side region and a breast-shield-side region. The chamber (280) tapers toward the opening (282) on the breast shield side. The chamber (280) comprises the form of a spherical calotte which is cut off in its tapering region. The media separating diaphragm (4) also comprises substantially the form of a flattened spherical calotte with an even top surface (411), wherein the even top surface (411) of the media separating diaphragm (4) faces the opening (282) of the chamber (280) on the breast shield side. The adapter according to the invention enables a minimum pressure drop over the media separating diaphragm and ensures reliable resetting into its original form.一種用於使用於吸出人類母乳之一吸乳泵之一乳房護罩(1)的轉接器包含具有導向該乳房護罩(1)之一第一開口(282)之一腔室(280)及遠離該乳房護罩之一第二開口(283)。該轉接器(2)另外包含一可撓性媒介分離隔膜(4)，該可撓性媒介分離隔膜容納於該腔室(280)中且將該腔室(280)分離成一泵側區域及一乳房護罩側區域。該腔室(280)朝向該乳房護罩側上之該開口(282)逐漸變窄。該腔室(280)包含在其逐漸變窄區域中被切斷之一球面帽狀的形狀。該媒介分離隔膜(4)實質上亦包含具有一平坦頂部表面(411)之一扁平球面帽狀之形狀，其中該媒介分離隔膜(4)之該平坦頂部表面(411)面向該乳房護罩側上之該腔室(280)之該開口(282)。根據本發明之該轉接器實現了該媒介分離隔膜上之一最小壓降且確保可靠地重置為其原始形狀。
