Oxygen and anesthesia delivery and monitoring device
Flow control system for anesthesia apparatus
Anesthetic gas control apparatus
Pop-off gas evacuator valve for anesthesia machine
Self-contained jet pump breathing apparatus
Anesthesia ventilating apparatus having a breathing circuit and control loops for anesthetic gas components
Rapid anesthesia emergence system using closed-loop PCO2 control
Method and device for reduction of rebreathing of gas from dead space
Anesthetic-vapor delivery apparatus with an ambient-referenced pressure regulator
ApplicationNo. 730508 filed on 10/11/1996
US Classes:128/204.22, Means for sensing partial pressure, or amount, of component in gas mixture128/203.12, Means for mixing treating agent with respiratory gas128/203.14, Control means responsive to condition other than user's airway pressure128/204.28Bag or bellows included in control mechanism
ExaminersPrimary: Lewis, Aaron J.
Assistant: Srivastava, V.
Attorney, Agent or Firm
International ClassA61M 016/01
AbstractEfficient management of breathing gases and anesthesia is achieved in an anesthesia delivery system which incorporates a flow minimization routine. The breathing circuit is provided with a pop-off valve and a flow sensor for detecting the pop-off flow. The flow rate of fresh gas into the breathing circuit is controlled, preferably via a digital computer, to minimize the amount of gas exhausted from the circuit. A control routine determines the minimal fresh gas flow necessary to maintain appropriate oxygen concentration, anesthetic agent concentration pop-off flow. A minimum value for the fresh gas flow may also be input to the control system. A fresh gas flow boost routine provides quick responses to charges in the user-set oxygen and agent concentrations. A circuit fill routine provides fresh gas to fill the breathing circuit until pop-off flow is sensed.
Field of SearchMeans for sensing partial pressure, or amount, of component in gas mixture
Means for mixing treating agent with respiratory gas
Means for mixing respiratory gas with water vapor and another treating agent
Bag or bellows included in control mechanism
Fluidic control device utilizing Coanda effect or jet impingement to alter fluid flow
Gas stream aspirating medicament from reservoir
Control means responsive to condition other than user's airway pressure