Anesthesia rebreathing system
OwnerMelvyn L. Henkin, Jordan M. Labyinventors
Life of this patent
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Abstract
An anesthesia gas delivery system including a patient circuit implemented primarily by a detachable structural portion and a control system implemented primarily by a permanent structural portion. The patient circuit includes a variable volume patient reservoir and a patient overflow tube. The control system includes a subsystem for preventing gas flow out of the overflow tube until the patient reservoir is full except when a pediatric breathing circuit is being used.
Claims21
An anesthesia gas delivery system including:
- a patient airway communication device;
- a breathing tube having a first port coupled to said patient airway communication device and a second port comprising a fresh gas inlet port;
- an overflow tube having a first port coupled to said breathing tube and a second port comprising a patient overflow port;
- a variable volume patient reservoir having an entrance opening coupled to said breathing tube proximate to the second port thereof;
- a patient overflow valve having an inlet port coupled to said patient overflow port;
- and
- a control subsystem including a valve closure device for maintaining said patient overflow valve closed at all times except when said patient reservoir is full, said subsystem including a sensing device responsive to said patient reservoir being full for disabling said valve closure device.
An anesthesia system for coupling a fresh gas supply means to a patient's airway, said system including:
- a detachable structural portion including a connector body defining a fresh gas interface port and a patient overflow interface port;
- a permanent structural portion including a mounting structure defining a fresh gas interface port and a patient overflow interface port;
- said connector body being configured to detachably seat on said mounting structure with said fresh gas interface ports communicating with one another and said patient overflow interface ports communicating with one another;
- said detachable portion including:
- a patient airway communication device;
- a breathing tube having a first port coupled to said patient airway communication device and a second port coupled to said connector body fresh gas interface port;
- an overflow tube having a first end coupled to said breathing tube and a second end coupled to said patient overflow interface port;
- and
- a variable volume patient reservoir having an entrance opening coupled to said breathing tube proximate to the second port thereof;
- said permanent portion including:
- a patient overflow valve having an inlet port coupled to said permanent portion patient overflow interface port;
- and
- a control subsystem including a valve closure device for maintaining said patient overflow valve closed at all times except when said reservoir is full, said subsystem including a sensing device responsive to said patient reservoir being full for disabling said valve closure device.
An anesthesia system for coupling a fresh gas supply means to a patient's airway, said system including:
- a detachable structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port;
- a permanent structural portion including mounting structure means defining a fresh gas interface port and a patient overflow interface port;
- means for detachably connecting said connector body means and said mounting structure means for communicating said fresh gas interface ports to one another and said patient overflow interface ports to one another;
- said detachable portion including:
- patient airway communication means;
- breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said detachable portion fresh gas interface port;
- overflow tube means having a first end coupled to said breathing tube means and a second end coupled to said detachable portion patient overflow interface port;
- and
- a patient breathing bag having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
- said permanent portion including:
- a patient overflow valve having an inlet port coupled to said detachable portion patient overflow interface port;
- and
- control means for establishing the level of pressure at said inlet port for opening said patient overflow valve means;
- said control means including:
- a rigid container;
- means in communication with said container for varying the pressure therein;
- means mounting said patient breathing bag in said container whereby pressure variations therein will produce corresponding variations in said patient breathing bag;
- and
- a control subsystem including a valve closure device for maintaining said patient overflow valve closed at all times except when said patient breathing bag is full volume, said subsystem including a sensing device responsive to said patient breathing bag being full for disabling said valve closure device.
In an anesthesia system including a patient circuit for coupling a fresh gas supply to a patient's airway wherein said patient circuit includes valve means for venting gas from the patient circuit and a variable volume reservoir means for alternately (1) receiving gas during patient exhalation and (2) supplying stored gas during patient inhalation, the improvement comprising:
- a constant volume container means for accommodating said variable volume reservoir means;
- exit path means for passing gas displaced from said container means;
- first bias means for establishing a positive end expiratory pressure against which a patient breathes, said first bias means defining a first positive threshold pressure only above which said exit path means passes gas from said container means;
- and
- second bias means incorporated in series with said valve means for establishing a second positive end expiratory pressure.
Dependencies are inferred from the claim text.