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 a fluid is carried away from the patient via a hose line, in particular for an extracorporeal blood treatment apparatus A. The device according to the invention for detecting moisture is constituted as a two-dimensionally extending fabric to be placed on the patients skin, which comprises an electrically conductive structure as a moisture sensor. The device is characterised in that the two-dimensionally extending fabric is a textile two-dimensionally extending fabric, which is constituted both by non-conductive warp and weft threads as well as conductive warp and weft threads 50, 60. The conductive and non-conductive warp and weft threads are disposed in such a way that the electrically conductive structure is created. A defined electrically conductive structure is produced in the woven fabric through spatial separation of the warp and weft threads. A decisive advantage in the use of both conductive warp threads and conductive weft threads lies in the fact that an electrically conductive structure can be constituted, which comprises sections running in different directions. A moisture sensor exhibiting a particularly high degree of sensitivity can be created with such a structure. The electrically conductive structure is preferably terminated with a terminating resistor R, which is preferably not a component part of device 40 for detecting moisture, but rather a connection part for the device, so that production is simplified.本發明關於一種偵測濕氣的裝置(40),該裝置(40)係與監測進入病患之通路的裝置(B)併用,且該裝置(B)係用於一種經軟管管線使流體饋入病患體內及/或自病患體內輸出流體之設備(特別是體外血液處理之設備(A)。本發明之偵測濕氣的裝置係建構成可設置於病患皮膚上的二維延展性織物,且該二維延展性織物包含導電結構以作為濕氣感測器。該裝置之特徵為該二維延展性織物係一種二維延展性紡織織物,其由非導電的經線和緯線以及導電的經線(50)和緯線(60)兩者構成。導電和非導電的經線及緯線係經配置而得以創造出導電結構。藉著使經線及緯線空間性地分隔而於該編織織物中產生經界定之導電結構。同時使用導電經線及導電緯線的決定性優點在於能夠構成包含於不同方向延伸之區段的導電結構。使用此種結構能創造出展現特別高感測度的濕氣感測器。該導電結構較佳係終止於端接電
