A needle-less fluid injection device, including, a nozzle head with an injection hole for accepting a dose of fluid to be injected into the skin of a patient, a fluid capsule that is connected to said nozzle head and provides the nozzle head with one or more doses of fluid for injection, an injection head for mounting the fluid capsule and the nozzle head; including a first mechanism for releasing a dose of fluid from the fluid capsule to the nozzle and a second mechanism for injecting the dose of fluid from the nozzle into the skin of a patient.