Anesthesia rebreathing system
First Claim
1. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
- a single use structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port;
a reusable 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 single use portion including;
patient airway communication means;
elongated breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said single use portion fresh gas interface port;
overflow means having a first end coupled to said breathing tube means and a second end coupled to said single use portion patient overflow interface port; and
patient breathing reservoir means having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
said reusable portion including;
patient valve means having an inlet port coupled to said reusable portion patient overflow interface port; and
control means for establishing the level of pressure at said inlet port for opening said patient valve means;
said control means including;
container means;
means in communication with said container means for varying the pressure therein;
means mounting said patient breathing reservoir means in said container means whereby pressure variations therein will produce corresponding variations in said reservoir means;
said means for detachably connecting said connector body means and said mounting structure means including latching means for automatically latching said connector body means to said mounting structure means when said connector body means is seated on said mounting structure means to functionally mate said fresh gas interface ports to one another and said patient overflow ports to one another;
selectively actuatable unlatching means, said unlatching means being the sole means for unlatching said latching means; and
sensing means for indicating when said connector body means is seated on said mounting structure means.
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Accused Products
Abstract
An anesthesia rebreathing system including a single use structural portion and a reusable structural portion configured so as to be readily latched together to automatically couple respective fresh gas interface ports and patient overflow ports. The single use portion includes a patient bag which is mounted in a closed rigid container in the reusable portion. Gas pressure in the container is controlled by an anesthetist squeezing an outside bag or by a mechanical vertilator, as determined by the setting of a user operable control knob subassembly, which also functions to establish gas pressure and volume in both the patient circuit and the control circuit.
169 Citations
102 Claims
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1. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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a single use structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port; a reusable 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 single use portion including; patient airway communication means; elongated breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said single use portion fresh gas interface port; overflow means having a first end coupled to said breathing tube means and a second end coupled to said single use portion patient overflow interface port; and patient breathing reservoir means having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
said reusable portion including;patient valve means having an inlet port coupled to said reusable portion patient overflow interface port; and control means for establishing the level of pressure at said inlet port for opening said patient valve means; said control means including; container means; means in communication with said container means for varying the pressure therein; means mounting said patient breathing reservoir means in said container means whereby pressure variations therein will produce corresponding variations in said reservoir means; said means for detachably connecting said connector body means and said mounting structure means including latching means for automatically latching said connector body means to said mounting structure means when said connector body means is seated on said mounting structure means to functionally mate said fresh gas interface ports to one another and said patient overflow ports to one another; selectively actuatable unlatching means, said unlatching means being the sole means for unlatching said latching means; and sensing means for indicating when said connector body means is seated on said mounting structure means. - View Dependent Claims (2, 3)
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4. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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a single use structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port; a reusable 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 single use portion including; patient airway communication means; elongated breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said single use portion fresh gas interface port; overflow means communicating said patient airway communication means to said single use portion patient overflow interface port; and patient breathing reservoir means having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
said reusable portion including;patient valve means having an inlet port coupled to said reusable portion patient overflow interface port; and control means for establishing the level of pressure at said inlet port for opening said patient valve means; said control means including; container means; means in communication with said container means for varying the pressure therein; means mounting said patient breathing reservoir means in said container means whereby pressure variations therein will produce corresponding variations in said reservoir means; said means for detachably connecting said connector body means and said mounting structure means including latching means for automatically latching said connector body means to said mounting structure means when said connector body means is seated on said mounting structure means to functionally mate said fresh gas interface ports to one another and said patient overflow ports to one another; selectively actuatable unlatching means, said unlatching means being the sole means for unlatching said latching means; said selectively actuatable unlatching means including means for ejecting said connector body means from said mounting structure means.
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5. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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a single use structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port; a reusable 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 single use portion including;patient airway communication means; elongated breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said single use portion fresh gas interface port; overflow means having a first end coupled to said breathing tube means and a second end coupled to said single use portion patient overflow interface port; and patient breathing reservoir means having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
said reusable portion including;patient valve means having an inlet port coupled to said reusable portion patient overflow interface port; and control means for establishing the level of pressure at said inlet port for opening said patient valve means; said control means including; container means; means in communication with said container means for varying the pressure therein; means mounting said patient breathing reservoir means in said container means whereby pressure variations therein will produce corresponding variations in said reservoir means; and
whereinsaid means for detachably connecting said connector body means and said mounting structure means includes mating means on said connector body means dimensioned to be seated on said mounting structure for mating operatively (1) said fresh gas interface ports to one anotehr to permit gas flow therebetween and (2) said patient overflow ports to one another to permit gas flow therebetween; means for sensing whether said connector body means is seated on said mounting structure; and means for permitting gas flow out of said mounting structure means fresh gas interface port only when said connector body means is seated. - View Dependent Claims (6, 7, 8)
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9. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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patient breathing means defining a fresh gas inlet port; fresh gas control means defining a fresh gas outlet port; mating means for detachably mating said patient breathing means and said fresh gas control means with said inlet and outlet ports in communication; and means for permitting gas flow from said outlet port only when said patient breathing means and said fresh gas control means are mated together; said means for permitting gas flow including sensor means for sensing when said patient breathing means and said fresh gas control means are mated together; and means including valve means responsive to said sensor means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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patient breathing means defining a fresh gas inlet port; fresh gas control means defining a fresh gas outlet port; mating means for detachably mating said patient breathing means and said fresh gas control means with said inlet and outlet ports in communication; said mating means comprising latching means for latching said patient breathing means and said fresh gas control means to one another in response to relative movement therebetween; selectively actuatable unlatching means, said unlatching means being the sole means for unlatching said latching means; sensor means for sensing whether said patient breathing means and said fresh gas control means are mated together; and means including valve means responsive to said sensor means for coupling said fresh gas supply means to said fresh gas outlet port only when said patient breathing means and said fresh gas control means are mated together. - View Dependent Claims (22, 23, 24)
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25. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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breathing tube means including a patient airway communication means and a connector body means defining a fresh gas inlet port and a monitoring outlet port; mounting means defining a fresh gas outlet port and a monitoring inlet port; said connector body means being configured to mate with said mounting means to concurrently establish communication between said fresh gas inlet and fresh gas outlet ports and said monitoring outlet and monitoring inlet ports mating latching means carried by said mounting means and said connector body means for engaging in response to said connector body means being mated to said mounting means; and monitoring tube means extending through said breathing tube means for coupling said monitoring outlet port to said patient airway communication means. - View Dependent Claims (26, 27)
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28. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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patient breathing means defining a fresh gas inlet port; fresh gas control means defining a fresh gas outlet port; mating means for detachably mating said patient breathing means and said fresh gas control means with said inlet and outlet ports in communication; control member means mounted for movement between an off position for preventing gas flow from said outlet port to said inlet port and a ventilating position for allowing gas flow from said outlet port to said inlet port; locking means for normally locking said control member means against movement from said off position to said ventilating position; and sensor means responsive to said patient breathing means and said fresh gas control means being mated together for disabling said locking means to permit movement of said control member means to said ventilating position.
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29. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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patient breathing means defining a fresh gas inlet port; fresh gas control means defining a fresh gas outlet port; mating means for detachably mating said patient breathing means and said fresh gas control means with said inlet and outlet ports in communication; control member means mounted for movement between an off position for preventing gas flow from said outlet port to said inlet port and a ventilating position for allowing gas flow from said outlet port to said inlet port; and sensor means for permitting gas flow from said outlet port to said inlet port only when said patient breathing means and said fresh gas control means are mated together; including means for latching said patient breathing means and said fresh gas control means to one another; and unlatching means selectively operable only when said control member means defines said off position for unlatching said patient breathing means and said fresh gas control means.
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30. Patient circuit means suitable for use with an anesthesia control apparatus having a fresh gas outlet port, and a latch member and inclined surface member each mounted for linear reciprocal movement, said patient circuit means comprising:
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patient airway communication means; a connector body defining a fresh gas inlet port, a breathing tube port, and passageway means communicating said fresh gas inlet and said breathing tube ports; breathing tube means connecting said breathing tube port to said patient airway communication means; said connector body including latching means for latching said connector body to said anesthesia control apparatus with said fresh gas inlet port aligned with said fresh gas outlet port, said latching means including a depending member defining a receptacle for accommodating said latch member mounted on said anesthesia control apparatus; said depending member further defining a terminal surface for engaging said latch member to move it linearly in a first direction when said connector body is moved in a second direction perpendicular to said first direction; said depending member further defining a ramp surface engagable by said linearly moveable inclined surface on said anesthesia control apparatus for ejecting said connector body from said control apparatus. - View Dependent Claims (31, 32)
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33. Patient circuit means for use with an anesthesia control apparatus having a fresh gas outlet port, said circuit means comprising:
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patient airway communication means; patient breathing reservoir means adapted to communicate with said fresh gas outlet port; elongated breathing tube means having an open first end coupled to said patient airway communication means, an open second end coupled to said patient breathing reservoir means, and an overflow port located proximate to said first end; elongated overflow tube means having an open first end coupled to said overflow port and an open second end adapted to communicate with an overflow valve means; one way expiratory valve means in said breathing tube means located between said overflow port and said second end for permitting gas flow only in a direction from said overflow port to said second end; inspiratory tube means having an open first end coupled to said patient breathing reservoir means and an open second end coupled to said breathing tube means between the first end thereof and said expiratory valve means; said inspiratory tube means including one way inspiratory valve means for permitting gas flow only in a direction from said first to said second end of said inspiratory tube means. - View Dependent Claims (34, 35, 36, 37)
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38. Patient circuit means for use with an anesthesia control apparatus having a mounting means defining a fresh gas port and a monitoring port, said circuit means comprising:
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patient airway communication means; connector body means including a mating portion defining a fresh gas interface port and a monitoring interface port, said mating portion being configured to mate with said mounting means to concurrently establish communication of said fresh gas ports to one another and said monitoring ports to one another; mating latching means carried by said mounting means and said mating portion for engaging in response to said mating portion means being mated to said mounting means; said connector body means further including a breathing tube port coupled internally through said connector body means to said fresh gas interface port; breathing tube means coupling said patient airway communication means to said breathing tube port; and monitoring tube means extending substantially coextensive with said breathing tube means for coupling said patient airway communication means to said monitoring interface port. - View Dependent Claims (39, 40, 41, 42)
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43. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means, a second port coupled to said patient reservoir means, and a third port coupled to said fresh gas supply means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; and (2) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accomodating said patient reservoir means; and (b) means for varying the pressure in said container means to produce corresponding pressure variations in said patient reservoir means, said pressure varying means comprising; (b1) working gas source means for supplying gas to said container means; (b2) manual means including outside bag means communicating with said container means, adapted to be squeezed by a user, for producing pressure changes in said container means; (b3) non-manual means for producing pressure changes; (b4) user operable selector means for selectively coupling either said manual means or said non-manual means to said container; (b5) overflow means for venting excess working gas from said outside bag and container means, said overflow means including user operable variable means for variably controlling gas flow through said overflow means; (b6) said user operable selector means and said user operable variable flow means includes a common manually operable control member. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first end, said first and having a first port coupled to said patient airway communication means, a second port coupled to said patient reservoir means, a second end having a port coupled to said fresh gas supply means, and an overflow port located proximate to said first end; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (f) one way expiratory valve means in said breathing tube means located between the overflow port and second end thereof for permitting gas flow therein only in a direction from said breathing tube means overflow port to the second end thereof; and (2) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accommodating said patient reservoir means; (b) outside bag means coupled to said container means and adapted to be squeezed by a user therein to produce corresponding pressure variations in said patient reservoir means; (c) control means for selectively defining either a first automatic bag mode or a second manual bag mode; (d) working gas source means; (e) means opeable during said manual bag mode for supplying working gas from said working gas source means to said outside bag means and container means; and (f) user opeable variable overflow means operable during said manual bag mode for variably venting excess working gas from said outside bag means and container means. - View Dependent Claims (61, 62)
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63. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means, a second port coupled to said patient reservoir means, and a third port coupled to said fresh gas supply means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; and (2) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accommodating said patient reservoir means; and (b) means for varying the pressure in said container means to produce corresponding pressure variations in said patient reservoir means, said pressure varying means comprising; (b1) manual means, including outside bag means adapted to be squeezed by a user, for producing pressure changes; (b2) nonmanual means for producing pressure changes; (b3) user operable selector means for selectively coupling either said manual means or said nonmanual means to said container means; (b4) bias means having inlet and outlet ports; (b5) means communicating said bias means inlet port with the pressure in said container means and wherein (b6) said bias means allows gas flow out of said container means only when the pressure therein exceeds a predetermined bias said predetermined bias creating a positive end expiratory pressure on said patent reservoir means. - View Dependent Claims (64, 65)
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66. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means, a second port coupled to said patient reservoir means, and a third port coupled to said fresh gas supply means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (2) a high pressure gas source; and (3) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accommodating said patient reservoir means; (b) outside bag means coupled to said container means and adapted to be squeezed by a user to produce pressure variations in said patient reservoir means; (c) fill means actuatable for supplying gas from said high pressure gas source to said container means; (d) dump means actuatable for venting gas from said container means; and (e) user operable control means for concurrently actuating said fill means and said dump means, said user operable control means comprising a single selectively operable control member. - View Dependent Claims (67, 68, 69, 70)
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71. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means, a second port coupled to said fresh gas supply means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (2) a high pressure gas source; and (3) control circuit means for producing said control pressure, said control circuit means including; (a) container means coupled to said patient valve means outlet port for accommodating said patient reservoir means; (b) outside bag means coupled to said container means and adapted to be squeezed by a user to produce pressure variations in said patient reservoir means; (c) fill means actuatable for supplying gas from said high pressure gas source to said patient circuit means; (d) dump means actuatable for venting gas from said container means; and (e) user operable control means for concurrently actuating said fill means and said dump means, said user operable control means comprising a single selectively operable control member. - View Dependent Claims (72)
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73. In an anesthesia system including:
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(1) patient circuit means comprising; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said patient reservoir means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (2) a gas source; and (3) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accommodating said patient reservoir means; and (b) outside bag means adapted to be squeezed by a user coupled to said container means for producing pressure variations in said patient reservoir means, the improvement comprising; fill means actuatable for supplying gas from said gas source to said container means; dump means actuatable for venting gas from said container means; a unitary control member mounted for movement between a rest position and an actuated position; and means responsive to said control member moving to said actuated position for actuating both said fill means and said dump means. - View Dependent Claims (74, 75)
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76. In an anesthesia system including:
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(1) patient circuit means comprising; (a) patient airway communication means; (b) patient reservoir means; (c) breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said patient reservoir means; (d) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a control pressure; (e) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (2) a gas source; and (3) control circuit means for producing said control pressure, said control circuit means including; (a) container means for accommodating said patient reservoir means; (b) manual means adapted to be squeezed by a user for producing pressure variations; and (c) nonmanual means for producing pressure variations;
the improvement comprising;a single control member mounted for rotational movement between a first manual position and a second nonmanual position; means responsive to said control member defining said manual position for coupling said manual means to said container means for producing pressure variations therein; variable overflow means coupled to said manual means for variably venting gas therefrom; said control member being capable of limited rotational movement when in said manual position for varying said overflow means; and means responsive to said control member defining said nonmanual position for coupling said nonmanual means to said container means for producing pressure variations therein. - View Dependent Claims (77, 78)
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79. Patient circuit means for use in an anesthesia system for delivering fresh anesthesia gas to a patient'"'"'s airway, said patient circuit means including:
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elongated breathing tube means having a first end adapted to communicate with the patient'"'"'s airway and a second end adapted to communicate with a source of fresh anesthesia gas, said breathing tube means further including an overflow port located proximate to said first end; elongated overflow tube means, substantially coextensive with said breathing tube means, having open first and second ends, said first end being coupled to said overflow port; patient overflow valve means coupled to said overflow tube means second end for permitting gas flow in said overflow tube means only in a direction from the first to the second end thereof; means mounting said overflow valve means in close proximity to said elongated breathing tube means second end; one way expiratory valve means in said breathing tube means located between the overflow port and second end thereof for permitting gas flow therein only in a direction from said breathing tube means overflow port to the second end thereof; inspiratory tube means having an open first end coupled to said breathing tube means between said overflow port and second end thereof and an open second end coupled to said breathing tube means proximate to the first end thereof; said inspiratory tube means including one way inspiratory valve means for permitting gas flow only in a direction from said first to said second end of said inspiratory tube means. - View Dependent Claims (80)
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81. A method of operating an anesthesia delivery system comprised of a patient circuit portion and a control circuit portion including the concurrent steps of:
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supplying high pressure gas to flush said patient circuit portion and fill said control circuit portion; and venting said control circuit portion through a bias means for establishing a predetermined gas volume and pressure therein. - View Dependent Claims (82, 83, 84, 85, 86, 87)
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88. A method of operating an anesthesia delivery system including a patient circuit portion comprising the steps of:
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selectively supplying high pressure gas to said patient circuit portion while concurrently venting said patient circuit portion through a bias means for establishing a predetermined gas volume and pressure in said patient circuit portion; and initiating said venting earlier than said supplying of high pressure gas - View Dependent Claims (89, 90, 91, 92)
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93. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system comprising:
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(1) patient circuit means including; (a) patient airway communication means; (b) breathing tube means having a first port coupled to said patient airway communication means, a second port coupled to said fresh gas supply means; (c) patient valve means including means for communicating inlet and outlet ports in response to pressure at said inlet port exceeding a reference pressure; (d) overflow passageway means having a first end coupled to said breathing tube means and a second end coupled to said patient valve means inlet port; (2) a high pressure gas source; (3) fill means actuatable for supplying gas from said high pressure gas source to said patient circuit means; (4) dump means actuatable for venting gas from said patient circuit means; and (5) user operable control means for concurrently actuating said fill means and said dump means, said user operable control means comprising a single selectively operable control member. - View Dependent Claims (94, 95, 96, 97, 98)
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99. An anesthesia system for coupling a fresh gas supply means to a patient'"'"'s airway, said system including:
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a single use structural portion including connector body means defining a fresh gas interface port and a patient overflow interface port; a reusable 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 single use portion including; patient airway communication means; elongated breathing tube means having a first port coupled to said patient airway communication means and a second port coupled to said single use portion fresh gas interface port; overflow means communicating said patient airway communication means to said single use portion patient overflow interface port; and patient breathing reservoir means having an entrance opening coupled to said breathing tube means proximate to the second port thereof;
said reusable portion including;patient valve means having an inlet port coupled to said reusable portion patient overflow interface port for venting gas from said single use portion; and control means for controlling the opening of said patient valve means; said control means including; container means; means in communication with said container means for varying the pressure therein; means mounting said patient breathing reservoir means in said container means whereby pressure variations therein will produce corresponding variations in said reservoir means; and expiratory pressure regulator means for venting gas from said patient valve means only when the pressure in said single use portion exceeds a first positive threshold level and for passing gas displaced from said container means only when the pressure therein exceeds said first positive threshold level to thus establish a positive end expiratory pressure against which a patient can breathe. - View Dependent Claims (100)
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101. 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:
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a constant volume container means for accommodating said variable volume reservoir means; exit path means for passing gas displaced from said container means; and bias means for establishing a positive end expiratory pressure against which a patient breathes, said bias means defining a positive threshold pressure only above which said valve means vents gas from said patient circuit and said exit path means passes gas from said container means. - View Dependent Claims (102)
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Specification