It is provided a medical apparatus for supplying a medication fluid into an organism and for detecting a substance of the organism, the medical apparatus comprising: a casing (101, 201, 301, 401, 501, 601) having a chamber (143, 243,343,443) for accommodating the medication fluid (133, 233, 333, 433) and having an opening (145, 245, 246, 345, 445) in fluid communication with the chamber a cannula (103, 203, 303, 403) having a lumen (161, 261, 361, 461) being in fluid communication with the chamber an insertion needle (105, 205) having a receptacle, wherein at least a portion of the insertion needle is removably arrangeable within the lumen of the cannula a sensor system (107, 207, 307) for detecting the substance of the organism, wherein the receptacle of the insertion needle is configured to removably at least partially receive the sensor system and a seal (153, 253, 353, 453), wherein the seal is adapted to annularly sealingly surround the insertion needle when the insertion needle is arranged in the opening, wherein the seal is adapted to annularly sealingly surround a portion (139, 239, 339, 439) of the sensor system when the insertion needle is removed from the opening and the portion (139, 239, 339, 439) of the sensor system is arranged in the opening.Linvention concerne un appareil médical pour introduire un fluide de médication dans un organisme et pour détecter une substance de lorganisme, lappareil médical comprenant : une enveloppe (101, 201, 301, 401, 501, 601) présentant une chambre (143, 243, 343, 443) pour recevoir le fluide de médication (133, 233, 333, 433) et ayant une ouverture (145, 245, 246, 345, 445) en communication fluidique avec la chambre une canule (103, 203, 303, 403) ayant une lumière (161, 261, 361, 461) qui est en communication fluidique avec la chambre une aiguille dintroduction (105, 205) ayant un réceptacle, au moins une partie de laiguille dintroduction pouvant être disposée de façon amovible à lintérieur de la lumière de la canu
