CARAT I is intended for ventilation of patients which are not completely dependent on mechanical ventilation. The device is suitable for ventilation of adults as well as of children with a tidal volume of 50 ml and higher. CARAT I has been designed specifically for use in home care but is also applicable for use in hospitals. Ventilation is either pressure controlled or volume controlled and is ensured by setting one of the ventilation modes listed below: - PCV – Pressure Controlled Ventilation or Pressure Controlled Assisted Ventilation - PSV – Pressure Supported Ventilation - SIMV – Synchronous Intermittent Mandatory Ventilation - VCV – Volume Controlled Ventilation or Volume Controlled Assisted Ventilation Both invasive ventilation (e.g. via tracheostoma) and non-invasive ventilation (via a ventilation mask) are possible. CARAT I provides the technical features required for operation with a single line patient circuit. The system can be connected to a low-pressure gas source for ventilation with an increased oxygen concentration. In addition, it is also possible to combine CARAT I with a humidifier. CARAT I is a medical device and may only be used if prescribed by a physician and under a physician’s responsibility.