초록 ▼

A low-oxygen alarm regulator assembly including a pair of diaphragms (40, 44) to which oxygen and nitrous oxide pressures are applied, and a displaceable intermediate member (46), the diaphragms having areas inversely proportional to desired flow rate percentages, to maintain the intermediate member

A low-oxygen alarm regulator assembly including a pair of diaphragms (40, 44) to which oxygen and nitrous oxide pressures are applied, and a displaceable intermediate member (46), the diaphragms having areas inversely proportional to desired flow rate percentages, to maintain the intermediate member in a neutral position if the desired flow ratio is maintained. The intermediate member actuates an alarm if the desired percentage flow of oxygen is not attained. In regulator operation, the assembly employs a valve (10) which is actuated with the alarm to apply an independent flow of oxygen to the oxygen diaphragm and thereby bypass an oxygen flow control valve and maintain a guaranteed oxygen flow ratio. The regulator action can be overriden by operation of a pneumatic switch (98a), which includes various safeguards to preclude inadvertent operation. A variable nitrous oxide flow restrictor 20 compensates for non-linearity in the pressure-flow characteristic for nitrous oxide at very low flows. Also disclosed are an embodiment of the regulator assembly responsive to the ratio between the flow rate of oxygen and the combined flow rates of two other gases and a ventilator alarm for detecting blockages as well as breaks in a patient breathing system is also disclosed.

대표청구항 ▼

An oxygen regulator and alarm system for use in conjunction with a gas anesthesia machine, said system comprising: a regulator assembly having a first chamber, a first diaphragm serving as a wall of said first chamber, a second chamber, a second diaphragm serving as a wall of said second chamber, an

An oxygen regulator and alarm system for use in conjunction with a gas anesthesia machine, said system comprising: a regulator assembly having a first chamber, a first diaphragm serving as a wall of said first chamber, a second chamber, a second diaphragm serving as a wall of said second chamber, an intermediate member disposed between and in contact with said first and second diaphragms and movable therewith, and an alarm switch operable by movement of said intermediate member; an oxygen flow restrictor connected between a flow controllable oxygen supply and a common outlet; an anesthesia gas flow restrictor connected between a flow controllable supply of anesthesia gas and the common outlet; an oxygen pressure line between the supply side of said oxygen flow restrictor and said first chamber; an anesthesia gas pressure line between the supply side of said anesthesia gas flow restrictor and said second chamber; and an oxygen bypass line for connecting said first chamber directly to a supply of oxygen; wherein the area of said diaphragm is greater than the area of said second diaphragm by a factor suffucient to provide equal pressure forces on said diaphragms when the percentage flow rate of oxygen is at a desired safety level; and wherein said regulator assembly further includes a regulator valve for controlling the flow of oxygen into said first chamber from said oxygen bypass line, in response to movement of said intermediate member, whereby a too low percentage of oxygen causes said regulator valve to open, increasing the oxygen pressure in said first chamber and supplying additional oxygen to the common outlet through said oxygen bypass line, said first chamber and said oxygen pressure line.