1. A device for delivering therapeutic fluid to a patient at an injection site, comprising: a casing having a first reservoir for containing therapeutic fluid and a second reservoir for containing therapeutic substance； an injector for administering therapeutic fluid at the injection site； therapeutic element configured to administer therapeutic substance to the injection site shortly before, during and / or after the injection of the therapeutic fluid； moreover, the administered therapeutic substance is intended to improve Nia at least one pharmacokinetic and / or pharmacodynamic properties of the administered therapeutic zhidkosti.2. The device according to claim 1, wherein the injector comprises a syringe, or a needleless syringe, or a pen-injector, or any combination of these elements. The device according to claim 1, in which the second reservoir and the first reservoir before injection are located in one casing. The device according to claim 1, in which the second tank is an integral part of the casing. The device according to claim 1, in which the second tank is made with the possibility of removal from the casing, as well as with the possibility of changing, replacing and / or adding to the casing. The device according to claim 1, wherein said therapeutic fluid contains insulin, or an insulin analog, or an insulin simulator, or any combination of these substances. The device according to claim 6, further comprising a sensor for detecting and measuring glucose level in the patient’s body. The device according to claim 7, in which the therapeutic element is configured to introduce a dosage of a therapeutic substance based on the measured glucose level in the patient’s body. Device1. Устройство для доставки терапевтической жидкости пациенту на участке инъекции, содержащее:кожух, имеющий первый резервуар для содержания терапевтической жидкости и второй резервуар для содержания терапевтического вещества；инъектор для введения терапевтической жидкости на участке ин
