System comprising a reusable disposable for usage within a medical treatment process by a corresponding medical apparatus, the reusable disposable comprising • first memory means (MEM 1) for storing predetermined data, whereby the first memory means are programmed during production of the reusable disposable, whereby the first memory means (MEM 1) are secured against fraudulent alteration after production, • second memory means (MEM 2) for storing patient data identifying a patient, whereby the second memory means are adapted to be changed only once, • wherein the reusable disposable is adapted to provide the patient data from the second memory means (MEM 2) for comparing with data identifying a currently treated patient, whereby usage of the reusable disposable is only allowed when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient, and • whereby the first memory means (MEM 1) comprise data selected from a group comprising maximum number of usages, maximum run time, best before date for checking whether the reusable disposable has reached end of usage, respectively whether a treatment would consume more than the maximum usage, to inhibit such usage the system further comprising said Medical apparatus for usage of reusable disposable, the medical apparatus comprising • means for reading data from first memory means (MEM 1) of said reusable disposable, • means for reading from second memory means (MEM 2) of said reusable disposable, • means for inputting for receiving patient data of a currently treated patient, • whereby usage of the reusable disposable is only allowed when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient, • whereby usage of the reusable disposable is only allowed when the reusable disposable has not reached end of usage, respectively a treatment would consume not more than the maximum usage, whereby within the system said medical apparatus and/or said reusable disposable comprise a means for identifying a match of data, whereby in case of a match, said means allow actuation of operational elements within the reusable disposable 1, whereby within the system re-usage is allowed by the disposable 1 and/or the machine A, within which the disposable 1 is used, when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient. • first memory means (MEM 1) for storing predetermined data, whereby the first memory means are programmed during production of the reusable disposable, whereby the first memory means (MEM 1) are secured against fraudulent alteration after production, • second memory means (MEM 2) for storing patient data identifying a patient, whereby the second memory means are adapted to be changed only once, • wherein the reusable disposable is adapted to provide the patient data from the second memory means (MEM 2) for comparing with data identifying a currently treated patient, whereby usage of the reusable disposable is only allowed when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient, and • whereby the first memory means (MEM 1) comprise data selected from a group comprising maximum number of usages, maximum run time, best before date for checking whether the reusable disposable has reached end of usage, respectively whether a treatment would consume more than the maximum usage, to inhibit such usage • means for reading data from first memory means (MEM 1) of said reusable disposable, • means for reading from second memory means (MEM 2) of said reusable disposable, • means for inputting for receiving patient data of a currently treated patient, • whereby usage of the reusable disposable is only allowed when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient, • whereby usage of the reusable disposable is only allowed when the reusable disposable has not reached end of usage, respectively a treatment would consume not more than the maximum usage, whereby within the system said medical apparatus and/or said reusable disposable comprise a means for identifying a match of data, whereby in case of a match, said means allow actuation of operational elements within the reusable disposable 1, whereby within the system re-usage is allowed by the disposable 1 and/or the machine A, within which the disposable 1 is used, when patient data from the second memory means (MEM 2) match to data identifying a currently treated patient.