Device for supplying a respiratory gas
The invention relates to a device for supplying a respiratory gas to a patient within the scope of the diagnosis and/or the treatment of sleep-related breathing disorders. The invention especially relates to a CPAP appliance comprising self-optimising dual level pressure regulation. According to the invention, the device for supplying a respiratory gas comprises an electronic signal processing device for generating a pressure control signal (p) on the basis of indicative signals ( 5 ) relating to the breathing activity and/or the physiological state of a person. The signal processing device ( 1 ) comprises a signal inputting device and an extraction device ( 2 ) for generating data field entries ( 3 ) according to predefined signal analysis procedures. A pressure signal generator ( 4 ) is provided for generating the pressure control signal (p), taking into account determined data field entries ( 3 ) which are at least selected by the extraction device ( 2 ).
1. Apparatus for supplying a respiratory gas to a patient comprising:
an electronic signal processing device to generate a pressure control signal based on signals indicative of the patient's breathing activity and physiological state, the signal processing device comprising a signal input device and an extraction device to generate data field entries in accordance with predetermined signal analysis procedures;
a pressure signal generator to generate the pressure control signal, wherein the pressure signal generator is configured to independently generate the pressure control signal based on at least some data field entries indicative of respiration phase and physiological state; and
a respiration phase coordinator to generate respiration phase data, wherein the respiration phase coordinator is configured to recognize respiration phase in conjunction with threshold consideration, wherein the threshold value is changeable with increasing distance with respect to an amount of time since the previous respiration phase change.
2. Apparatus as set forth in claim 1 wherein the respiration phase coordinator is configured to change the threshold value such that change-over sensitivity increases.
3. Apparatus for supplying a respiratory gas to a patient comprising:
an electronic signal processing device to generate a pressure control signal based on signals indicative of the patient's breathing activity and physiological state, the signal processing device comprising a signal input device and an extraction device to generate data field entries in accordance with predetermined signal analysis procedures;
a pressure signal generator to generate the pressure control signal, wherein the pressure signal generator is configured to independently generate the pressure control signal based on at least some data field entries indicative of respiration phase and physiological state; and
a respiration phase coordinator to generate respiration phase data, wherein the respiration phase coordinator and the pressure signal generator are operatively interlinked such that the distance between the inspiration pressure and the expiration pressure is reduced when blurred respiration phase recognition occurs.