A method for an aseptic assembly of a multi-component medical device , in particular a skin-mountable sensor device, comprising the steps of a) providing a first component of the medical device in a first container and a second component of the medical device in a second container , wherein each of the separated containers comprises a ruptureable portion , b) sterilizing the first component in the first container using a first sterilization technique and sterilizing the second component in the second container using a second sterilization technique, c) joining the first and second container while arranging the ruptureable portions in an overlapping configuration which is aseptically sealed against the surroundings, wherein at least one of the first and second containers has an adhesive portion , and wherein the containers are adhered to each other using the adhesive portion , d) transferring one of the components through the ruptureable portions and aseptically assembling the components to form the medical device as a sterile package, characterised in that the first and second sterilization techniques are different from each other and are selected from the group consisting of: - gas sterilization, preferably using ethylene oxide gas, - irradiation sterilization, preferably using an electron beam, - thermal sterilization, wherein at least one of the first and second containers has a flexible wall , wherein at least one of the first and second components is manipulated through the flexible wall to form the medical device . a) providing a first component of the medical device in a first container and a second component of the medical device in a second container , wherein each of the separated containers comprises a ruptureable portion , b) sterilizing the first component in the first container using a first sterilization technique and sterilizing the second component in the second container using a second sterilization technique, c) joining the first and second container while arranging the ruptureable portions in an overlapping configuration which is aseptically sealed against the surroundings, wherein at least one of the first and second containers has an adhesive portion , and wherein the containers are adhered to each other using the adhesive portion , d) transferring one of the components through the ruptureable portions and aseptically assembling the components to form the medical device as a sterile package, characterised in that the first and second sterilization techniques are different from each other and are selected from the group consisting of: - gas sterilization, preferably using ethylene oxide gas, - irradiation sterilization, preferably using an electron beam, - thermal sterilization, wherein at least one of the first and second containers has a flexible wall , wherein at least one of the first and second components is manipulated through the flexible wall to form the medical device . - gas sterilization, preferably using ethylene oxide gas, - irradiation sterilization, preferably using an electron beam, - thermal sterilization, wherein at least one of the first and second containers has a flexible wall , wherein at least one of the first and second components is manipulated through the flexible wall to form the medical device . <EOS>