Respirator

摘要

A respirator for use in replacing or assisting the respiratory function in patients in whom spontaneous respiration is either absent or insufficient is described. The respirator includes a respirator conduit having a down-stream end which is attachable to a proximal end of a patient tube 3. A respiratory gas line 6 is connected to a downstream section of the conduit and opens into the conduit at a first location adjacent but upstream of the downstream end 4. An axially extending driving gas jet nozzle 11 is provided at a location which is at least one tidal volume upstream from the patient attachment 4, where the respiratory fresh gas is supplied. The driving gas from the driving jet 11 simply controls the tidal volume like a pneumatic piston and drives the respiratory gas accumulated in the conduit 5 from the supply of the continuous flow of the respiratory gas. The driving gas from jet 11 does not take part in the pulmonary gas exchange. Ventilation of any patient at any frequency and tidal volume is possible with this new respirator, safely, with any chosen low pressure conditioned and humidified respiratory gas including volatile anaesthetic vapors. In its simplest form the respirator can be described as a slave driving jet placed in the wide tube of a T piece, one tidal volume distal to the patient attachment where the respiratory gas is supplied through the narrow limb of the T-piece.