The invention relates to a device (40) for detecting moisture for use with a device (B) for monitoring an access to a patient for an apparatus with which a fluid is fed to a patient and/or carried away from a patient via a hose line, in particular for monitoring the vascular access in an extracorporeal blood treatment in which a patient's blood is carried away from the patient via an arterial hose line 5 which has an arterial puncture cannula 6, and is fed back again to the patient via a venous hose line 7 which has a venous puncture cannula 8. The device according to the invention for detecting moisture is constituted as a cover 22 made of a flexible material to be placed on the patient's skin, said cover having an upper side 22A facing away from the patient's skin and an underside 22B facing the patient's skin. The cover (pad) comprises a cutout 23 for the passage of fluid, in particular blood, and a moisture sensor 28 with contact elements 28D, 28E for the connection thereof. Moisture sensor 28 can detect blood which gets through cutout 23 onto the surface of pad 22. The device according to the invention is characterised in that cover 22 is not permeable to liquid at underside 22A.本發明有關一水分檢測設備(40)，用於與監視對病人的進接之裝置(B)一起使用，特別是用於監視體外血治療中之血管進接之裝置，而用於一流體能以其經由軟管被餵入至病人及/或帶離病人之設備，其中病人之血液經由一具有動脈穿刺插管(6)之動脈軟管(5)被帶離該病人，且經由一具有靜脈穿刺插管(8)之靜脈軟管(7)被再次回傳至該病人。根據本發明之水分檢測設備被製成為一蓋子(22)，該蓋子由將被放置在該病人的皮膚上之彈性材料所製成，該蓋子具有一面朝遠離該病人之皮膚的上側面(22A)與一面朝該病人之皮膚的底側(22B)。該蓋子(墊片)包括一供流體、特別是血液之通過的切口(23)、及一具有用於連接該水分感測器之接觸元件(28D、28E)的水分感測器(28)。水分感測器(28)能檢測通過該切口(23)至該墊片(22)的表面上之血液。根據本發明之裝置的特徵為該蓋子(22)在底側(22A)係不能滲透液體的。
