The hoffrichter carat ii ventilator machine is intended for continuous or intermittent ventilation of patients. the device is suitable for ventilation of adults as well as of children with a tidal volume of 50 ml and higher. carat iihas 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 tracheostomy)and non-invasive ventilation (via a ventilation mask) are possible. carat ii provides the technical features required for operation with a single line patient circuit or a double line patient circuit as necessary. 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 ii with a humidifier. carat ii is a medical device and may only be used if prescribed by a physician and under a physician’s responsibility.