US 5,076,267 AGranted

Closed circuit breathing device with pressure sensing means

AssigneeDragerwerk Aktiengesellschaft

InventorAdalbert Pasternack

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Abstract

A circulation respirator is capable of excess-pressure operation with a compressed gas source and an auxiliary pressure arrangement which brings about an increase in the pressure in the respiratory circulation. The apparatus includes measuring circuit connected to a pressure sensor for controlling the auxiliary pressure arrangement. Excess pressure is maintained in the respiratory circulation independently of the respiratory phase. The sensor is arranged as pressure sensor in the respiratory circulation only if the pressure falls below a preset positive nominal value of the pressure in the respiratory circulation. A method of operating a respirator system which includes a respirator bag connected through an inhalation duct to a patients respirator gas connector to the respirator bag comprising sensing the pressure in a pressurized respiratory gas connection to the inhalation duct, and connecting an additional pressurized gas to the inhalation duct when the pressure in the said gas connection falls below a predetermined pressure.

Claims12

Dependent claims

A circulation respirator, comprising:

a user's respiratory gas connection for establishing a respiratory circulation having an inhalation duct and an exhalation duct;
a compressed gas source connected to said inhalation duct;
a compressible respiratory gas reserve connected to each of said inhalation and exhalation ducts, said compressible respiratory gas reserve is formed in a respirator bag;
auxiliary pressure means connected to said compressible respiratory gas reserve for increasing the gas pressure in the respiratory circulation, said auxiliary pressure means includes a cylinder-piston unit with first and second pressurizable cylinder chambers each being connected to a compressed gas duct via a first and second switch valve, respectively, said cylinder-piston unit acting on said respirator bag to alter the respiratory circulation gas pressure;
pressure sensor means for sensing the respiratory circulation gas pressure;
and,
measuring circuit means connected to said switch valves to alternately open said first and second switch valve for, independently of the users respiratory cycle, controlling the operation of said auxiliary pressure means to activate said auxiliary pressure means when the respiratory circulation gas pressure falls below a preset position nominal pressure value.

4 more elements

Dependencies are inferred from the claim text.