US4883051A — Disposable breathing system and components

Claim 1

Independent Claim 392 words

An anesthesia system comprising: anesthesia machine means connected to an external gas source to receive gas therefrom, and connected to continuously supply a preselected mixture of gas, said anesthesia machine means have means to mix the gas received into said preselected mixture of gas; a disposable breathing circuit interconnectable between said anesthesia machine means and a patient, said disposable breathing circuit having: first connector means for connection to said anesthesia machine means to receive said preselected mixture of gas therefrom, second connector means for connection to said patient to supply and receive respiratory gas, reservoir means connected for receiving, storing and supplying said preselected mixture of gas and for receiving, storing and supplying said respiratory gas and for adding said preselected mixture of gas thereto, tube means interconnected between said first connector means, second connector means and said reservoir means to communicate said respiratory gas from said patient to said reservoir means upon expiration of gas from said patient and from said reservoir means to said patient upon inspiration of gas to said patient, and to communicate said preselected mixture of gas from said anesthesia machine means to said reservoir means, actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a collapsed first position in which said preselected mixture of gas and respiratory gas therewithin are supplied from said reservoir means to the patient via said tube means and an expanded second position in which the respiratory gas is expelled from the patient via said tube means and to receive said preselected mixture of gas via said tube means from said anesthesia machine means; excessive gas pressure relief means in communication with said respiratory gas and said preselected mixture of gas during all but the time said gases are being supplied from said reservoir means to the patient; and means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means with the respiratory gas and the preselected mixture of gas during supply of said gases to the patient; and ventilation machine means for generating inspiration signals and expiration signals in accordance with a preselected pattern and removably connected to said actuator means to supply said inspiration signals and expiration signals thereto for urging said reservoir means between said first and second positions respectively.

Claim 2

Dependent Claim 392 words

An anesthesia system comprising: anesthesia machine means connected to an external gas source to receive gas therefrom, and connected to continuously supply a preselected mixture of gas, said anesthesia machine means have means to mix the gas received into said preselected mixture of gas; a disposable breathing circuit interconnectable between said anesthesia machine means and a patient, said disposable breathing circuit having: first connector means for connection to said anesthesia machine means to receive said preselected mixture of gas therefrom, second connector means for connection to said patient to supply and receive respiratory gas, reservoir means connected for receiving, storing and supplying said preselected mixture of gas and for receiving, storing and supplying said respiratory gas and for adding said preselected mixture of gas thereto, tube means interconnected between said first connector means, second connector means and said reservoir means to communicate said respiratory gas from said patient to said reservoir means upon expiration of gas from said patient and from said reservoir means to said patient upon inspiration of gas to said patient, and to communicate said preselected mixture of gas from said anesthesia machine means to said reservoir means, actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a collapsed first position in which said preselected mixture of gas and respiratory gas therewithin are supplied from said reservoir means to the patient via said tube means and an expanded second position in which the respiratory gas is expelled from the patient via said tube means and to receive said preselected mixture of gas via said tube means from said anesthesia machine means; excessive gas pressure relief means in communication with said respiratory gas and said preselected mixture of gas during all but the time said gases are being supplied from said reservoir means to the patient; and means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means with the respiratory gas and the preselected mixture of gas during supply of said gases to the patient; and ventilation machine means for generating inspiration signals and expiration signals in accordance with a preselected pattern and removably connected to said actuator means to supply said inspiration signals and expiration signals thereto for urging said reservoir means between said first and second positions respectively.

Claim 3

Dependent Claim 33 words

The anesthesia system of claim 1 wherein said reservoir means is a respiration bag which is formed to collapse upon receipt of said inspiration signals and expand upon receipt of said expiration signals.

Claim 4

Dependent Claim 75 words

The anesthesia system of claim 2 wherein said actuator means includes an actuation container formed of a substantially inelastic material, wherein said respiration bag is sealably positioned within said actuation container, and wherein said inspiration signals are a positive pressure signal to urge said respiration bag to said first collapsed position and said expiration signals are the absence of positive pressure signals so that said respiration bag may be urged to said second expanded position.

Claim 5

Dependent Claim 38 words

The anesthesia system of claim 3 wherein said actuation container is a rigid container with sides, one of which is manually and slidably movable toward the interior of said rigid container to contact and collapse said respiration bag.

Claim 6

Dependent Claim 32 words

The anesthesia system of claim 2 wherein said actuator means includes an actuator bag formed of a gas impermeable and substantially inelastic flexible material to be manually collapsible about said respiration bag.

Claim 7

Dependent Claim 46 words

The anesthesia system of claim 5 wherein said disposable breathing circuit further includes absorber means interconnected to receive the respiratory gas from the patient and to supply the respiratory gas to said respiration bag, said absorber means operating to remove carbon dioxide from the respiratory gas.

Claim 8

Dependent Claim 154 words

The anesthesia system of claim 6 wherein said second connector is a Y connector having a first leg for connection to the patient, a second leg for transmission of the respiratory gas, and a third leg for receipt of the respiratory gas, wherein said tube means includes a first branch interconnected between said second leg and said absorber means, a second branch interconnected between said first branch and said anesthesia machine means, a third branch interconnected between said absorber means and said respiration bag, and a fourth branch interconnected between said third branch and said third leg, said first branch further including a one-way valve positioned and operative for communicating respiratory gas from the patient and inhibiting the flow of gas therethrough to the patient, and said fourth branch further including a one-way valve positioned and operative for communicating respiratory gas to the patient and inhibiting the flow of respiratory gas from the patient.

Claim 9

Dependent Claim 40 words

The anesthesia system of claim 7 wherein said second branch includes a third one-way valve interconnected for communicating the preselected mixture of gas therethrough from said anesthesia machine means and inhibiting the flow of gas to said anesthesia machine means.

Claim 10

Dependent Claim 32 words

The anesthesia system of claim 8 wherein said fourth branch includes oxygen sensor means interconnected to sense oxygen concentration of the respiratory gas and generate signals reflective thereof to a remote indicator.

Claim 11

Dependent Claim 44 words

The anesthesia system of claim 9 wherein the anesthesia machine means receives a supply of oxygen and gas anesthetic from the external source, includes means to adjustably mix the oxygen and gas anesthetic and to supply same at a pressure preselected to cause flow.

Claim 12

Dependent Claim 98 words

The anesthesia system of claim 10 wherein the ventilator machine means is connected to an external source of gas and includes: power supply means to supply power; valve means interconnected to receive gas from the external source of gas for opening and closing in accordance with open and close signals to supply and to restrict the flow of the gas; signal generation means to generate open and close signals in accordance with a preselected pattern; and output means connected to said valve means and to said actuator means to communicate the gas as said inspiration and expiration signals.

Claim 13

Dependent Claim 201 words

The anesthesia system of claim 5 wherein said actuator means further includes a valve to interconnect said respiration bag with said tube means and to interconnect said actuator bag to said ventilation machine means, said valve having: a valve body; a first port formed in said valve body for connection to said tube means to communicate gas therebetween; respiration bag connection means associated with said valve body for sealed connection of said respiration bag thereto; a second port formed in said valve body positioned and connected to said respiration bag to communicate gas therebetween a channel formed in said valve body to intercommunicate gas between said first port and said second port; actuator connection means associated with said valve body for sealed connection of said actuator bag for intermittently actuating said respiratory bag; third port means formed in said valve body for interconnection to said ventilation machine means; fourth port means formed in said valve body positioned and connected to said actuator bag to communicate inspiration and expiration signals thereto from said ventilation machine means; and second channel means formed in said valve body to intercommunicate said expiration and inspiration signals between said third port means and said fourth port means.

Claim 14

Dependent Claim 42 words

The anesthesia system of claim 12 wherein the excessive gas pressure relief means includes vent means formed and positioned to vent gas from said first channel to outside the said valve body when the pressure of the gas exceeds a preselected pressure.

Claim 15

Dependent Claim 64 words

The anesthesia system of claim 13 wherein said vent means includes a third channel having a first and second portion formed in said valve body, wherein said respiration bag has a vent portion sealably positioned in said channel between said first and second portion, said respiration bag being deformable at said preselected pressure to communicate gas from said first portion to said second portion.

Claim 16

Dependent Claim 83 words

The anesthesia system of claim 13 wherein the means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means includes a slide gate positioned in said first channel and movable from a first, normal position in which gas is communicated into said channel, to a second position to preclude gas from communication into said third channel during flow of gases in the first channel from the reservoir to the patient.

Claim 17

Dependent Claim 91 words

The anesthesia system of claim 15 further including a first pressure sensing means formed and positioned within said valve body to sense pressure in said first channel between said first port and said slide gate, and a second pressure sensing means positioned and formed in said valve body to sense pressure in said first channel between said second port and said slide gate, whereby the flow rate of gases through the first channel may be determined based on the difference in pressure measured by the first and second pressure sensing means.

Claim 18

Dependent Claim 124 words

The anesthesia system of claim 2 wherein said ventilation machine means includes: first connector means for connection to an external source of pressurized gas at a supply pressure; pressure regulator means connected to receive the pressurized gas from said first connector means and to supply regulated gas, said pressure regulator means having means to control the pressure of the pressurized gas to be regulated gas at pressures at and below the supply pressure, as selected by the user; signal valve means connected to receive the regulated gas and to open and close in accordance with a preselected pattern to supply said inspiration signals when open and expiration signals when closed; and second connector means for connecting the signal valve means to said actuator means.

Claim 19

Dependent Claim 107 words

The anesthesia system of claim 17 wherein said ventilation machine means further includes: mixing means interconnected to receive the regulated gas from said signal valve means, said mixing means having means to receive gas from a second source and mix the gas from said second source with the regulated gas to form signal gas; and check and vent means connected to receive and communicate the signal gas from said mixing means to said second connector means, to inhibit the flow of gas from said second connector means into said mixing means to the vent gas from said second connector means when said signal valve means is closed.

Claim 20

Dependent Claim 66 words

The anesthesia system of claim 18 wherein said pressure regulator means is electrically controlled and wherein said signal valve means is an electrical solenoid valve, wherein said ventilation machine means includes sensing means to sense pressure parameters, input means to select desired parameters and output means to supply control signals to said pressure regulator and electrical solenoid valve for operation thereof as selected by the user.

Claim 21

Dependent Claim 276 words

A disposable breathing circuit comprising: first connector means for connection to a continuous supply of breathable gas; second connector means for connection to a patient to supply and receive respiratory gas; reservoir means connected for receiving, storing and supply the breathable gas and for receiving, storing and supplying the respiratory gas and for adding the breathable gas therewith; tube means interconnected between said first connector means, said second connector means, and said reservoir means to communicate the respiratory gas from the patient and to said reservoir means and from said reservoir means to the patient, and to communicate the breathable gas from said first connector means to said reservoir means; actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a first collapsed position in which the breathable gas and respiratory gas therewithin are supplied from said reservoir to the patient via said tube means, and a second expanded position to receive the respiratory gas from the patient via said tube means and to receive the breathable gas via said tube means from said first connector means, said actuator means being connected to an external source of inspiration and expiration signals to urge said reservoir means between said first and second positions respectively; low pressure relief means in communication with the respiratory and the breathable gases during all but the time the gases are being supplied from the reservoir means to the patient; and means operated by the flow of gases from the reservoir means to the patient for blocking communication of the low pressure relief means with the respiratory and breathable gases during supply of the gases to the patient.

Claim 22

Dependent Claim 276 words

A disposable breathing circuit comprising: first connector means for connection to a continuous supply of breathable gas; second connector means for connection to a patient to supply and receive respiratory gas; reservoir means connected for receiving, storing and supply the breathable gas and for receiving, storing and supplying the respiratory gas and for adding the breathable gas therewith; tube means interconnected between said first connector means, said second connector means, and said reservoir means to communicate the respiratory gas from the patient and to said reservoir means and from said reservoir means to the patient, and to communicate the breathable gas from said first connector means to said reservoir means; actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a first collapsed position in which the breathable gas and respiratory gas therewithin are supplied from said reservoir to the patient via said tube means, and a second expanded position to receive the respiratory gas from the patient via said tube means and to receive the breathable gas via said tube means from said first connector means, said actuator means being connected to an external source of inspiration and expiration signals to urge said reservoir means between said first and second positions respectively; low pressure relief means in communication with the respiratory and the breathable gases during all but the time the gases are being supplied from the reservoir means to the patient; and means operated by the flow of gases from the reservoir means to the patient for blocking communication of the low pressure relief means with the respiratory and breathable gases during supply of the gases to the patient.

Claim 23

Dependent Claim 34 words

The disposable breathing circuit of claim 20 wherein said reservoir means is a respiration bag which is formed to collapse upon receipt of said inspiration signals and expand upon receipt of said expiration signals.

Claim 24

Dependent Claim 74 words

The disposable breathing circuit of claim 21 wherein said actuator means includes an actuation container formed of a substantially inelastic material, wherein said respiration bag is positioned within said actuation container, and wherein said inspiration signals are a positive pressure signal to urge said respiration bag to said first collapsed position and said expiration signals are the absence of pressure signals so that said respiration bag may be urged to said second expanded position.

Claim 25

Dependent Claim 39 words

The disposable breathing circuit of claim 22 wherein said actuation container is a rigid container w sides, one of which is manually and slidably movable toward the interior of said rigid container to contact and collapse said respiration bag.

Claim 26

Dependent Claim 29 words

The disposable breathing circuit of claim 21 wherein said actuator means includes a bag formed of a gas impermeable flexible material to be manually collapsible about said respiration bag.

Claim 27

Dependent Claim 41 words

The disposable breathing circuit of claim 24 further including absorber means interconnected to receive respiratory gas from the patient and to supply the respiratory gas to said respiration bag, said absorber means operating to remove carbon dioxide from the respiratory gas.

Claim 28

Dependent Claim 153 words

The disposable breathing circuit of claim 25 wherein said second connector is a Y connector having a first leg for connection to the patient, a second leg for transmission of respiratory gas, and a third leg for receipt of respiratory gas, wherein the tube means includes a first branch interconnected between said second leg and said absorber means, a second branch interconnected between said first branch and said first connector means, a third branch interconnected between said absorber means and said respiration bag, and a fourth branch interconnected between said third branch and said third leg, said first branch further including a one-way valve positioned and operative for communicating respiratory gas from the patient and inhibiting the flow of gas therethrough to the patient, and said fourth branch further including a one-way valve positioned and operative for communicating respiratory gas to the patient and inhibiting the flow of respiratory gas from the patient.

Claim 29

Dependent Claim 40 words

The disposable breathing circuit of claim 26 wherein said second branch includes a third one-way valve interconnected for communicating the anesthetic gas therethrough from said first connector means and inhibiting the flow of anesthetic gas to said first connector means.

Claim 30

Dependent Claim 28 words

The disposable breathing circuit of claim 27 wherein said fourth branch includes oxygen sensor means to sense oxygen concentration and generate signals reflective thereof to a remote indicator.

Claim 31

Dependent Claim 202 words

The disposable breathing circuit of claim 20 wherein said actuator means further includes a valve to interconnect said respiration bag with said tube means and to interconnect said actuator bag to said ventilation machine means, said valve having: a valve body; a first port formed in said valve body for connection to said tube means to communicate gas therebetween; respiration bag connection means associated with said valve body for sealed connection of said respiration bag thereto; a second port formed in said valve body positioned and connected to said respiration bag to communicate gas therebetween; a channel formed in said valve body to intercommunicate gas between said first port and said second port; actuator connection means associated with said valve body for sealed connection of said actuator bag for intermittently actuating said respiratory bag; third port means formed in said valve body for interconnection to said ventilation machine means; fourth port means formed in said valve body positioned and connected to said actuator bag to communicate inspiration and expiration signals thereto from said ventilation machine means; and second channel means formed in said valve body to intercommunicate said expiration and inspiration signals between said third port means and said fourth port means.

Claim 32

Dependent Claim 43 words

The disposable breathing circuit of claim 29 wherein the excessive gas pressure relief means includes vent means formed and positioned to vent gas from said first channel to outside the said valve body when the pressure of the gas exceeds a preselected pressure.

Claim 33

Dependent Claim 65 words

The disposable breathing circuit of claim 30 wherein said vent means includes a third channel having a first and second portion formed in said valve body, wherein said respiration bag has a vent portion sealably positioned in said channel between said first and second portion, said respiration bag being deformable at said preselected pressure to communicate gas from said first portion to said second portion.

Claim 34

Dependent Claim 84 words

The disposable breathing circuit of claim 30 wherein the means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means includes a slide gate positioned in said first channel and movable from a first, normal position in which gas is communicated into said channel, to a second position to preclude gas from communication into said third channel during flow of gases in the first channel from the reservoir to the patient.

Claim 35

Dependent Claim 92 words

The disposable breathing circuit of claim 32 further including a first pressure sensing means formed and positioned within said valve body to sense pressure in said first channel between said first port and said slide gate, and a second pressure sensing means positioned and formed in said valve body to sense pressure in said first channel between said second port and said slide gate, whereby the flow rate of gases through the first channel may be determined based on the difference in pressure measured by the first and second pressure sensing means.

Claim 36

Dependent Claim 284 words

A transport ventilation system comprising: a disposable breathing circuit having: connector means for connection to a patient to supply and receive respiratory gas, reservoir means connected to receive, store and supply said respiratory gas, tube means connected to said connector means and said reservoir means to communicate the respiratory gas between the patient and said reservoir means, supply means selectively adapted to said tube means and reservoir means to supply a breathable gas from an external source, exhaust means interconnected in said tube means to exhaust respiratory gas from the patient, actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a first collapsed position in which the breathable gas and the respiratory gas therewithin are supplied from said reservoir to the patient via said tube means, and a second expanded position to exhaust the respiratory gas from the patient via said connector means, said tube means, and said exhaust means and to receive said breathable gas via said tube means from said supply means; excessive gas pressure relief means in communication with the respiratory and the breathable gases during all but the time the gases are being supplied from the reservoir means to the patient; means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means with the respiratory and breathable gases during supply of the gases to the patient; and ventilation machine means for generating inspiration signals and expiration signals in accordance with a preselected pattern and removably connectable to said actuator means to supply said inspiration signals and expiration signals thereto for urging said reservoir means between said first and second positions respectively.

Claim 37

Dependent Claim 284 words

A transport ventilation system comprising: a disposable breathing circuit having: connector means for connection to a patient to supply and receive respiratory gas, reservoir means connected to receive, store and supply said respiratory gas, tube means connected to said connector means and said reservoir means to communicate the respiratory gas between the patient and said reservoir means, supply means selectively adapted to said tube means and reservoir means to supply a breathable gas from an external source, exhaust means interconnected in said tube means to exhaust respiratory gas from the patient, actuator means positioned operatively proximate to said reservoir means to urge said reservoir means between a first collapsed position in which the breathable gas and the respiratory gas therewithin are supplied from said reservoir to the patient via said tube means, and a second expanded position to exhaust the respiratory gas from the patient via said connector means, said tube means, and said exhaust means and to receive said breathable gas via said tube means from said supply means; excessive gas pressure relief means in communication with the respiratory and the breathable gases during all but the time the gases are being supplied from the reservoir means to the patient; means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means with the respiratory and breathable gases during supply of the gases to the patient; and ventilation machine means for generating inspiration signals and expiration signals in accordance with a preselected pattern and removably connectable to said actuator means to supply said inspiration signals and expiration signals thereto for urging said reservoir means between said first and second positions respectively.

Claim 38

Dependent Claim 34 words

The transport ventilation system of claim 34 wherein said reservoir means is a respiration bag which is formed to collapse upon receipt of said inspiration signals and expand upon receipt of said expiration signals.

Claim 39

Dependent Claim 30 words

The transport ventilation system of claim 35 wherein said actuator means includes an actuator bag formed of a gas impermeable flexible material to be manually collapsible about said respiration bag.

Claim 40

Dependent Claim 97 words

The transport ventilation system of claim 36 wherein said connector is a Y connector having a first leg for connection to the patient, a second leg for connection to said exhaust means, and a third leg for receipt of respiratory gas, wherein the tube means includes a first branch interconnected between said second leg and said exhaust means, a second branch interconnected between said third leg and said respiration bag; said second branch further including a one-way valve positioned and operative for communicating respiratory gas to said patient and precluding communication of gas therethrough from the patient.

Claim 41

Dependent Claim 23 words

The transport ventilation system of claim 36 wherein said supply means includes an inlet one-way valve interconnected to supply air at atmospheric pressure.

Claim 42

Dependent Claim 42 words

The transport ventilation system of claim 36 wherein said supply means is a poppet valve structure positioned on said respiratory bag and extending through said actuator bag to supply air to said respiratory bag in operation between said first and second positions.

Claim 43

Dependent Claim 26 words

The transport ventilation system of claim 36 wherein said supply means includes a blender machine interconnected into said tube means to supply breathable gas under pressure.

Claim 44

Dependent Claim 99 words

The transport ventilation system of claim 40 wherein said exhaust means is a two-way valve having a first port connected to the patient to receive and supply respiratory gas, a second port open to the atmosphere to exhaust respiratory gas and a third port connected to said respiration bag via said tube means, said two-way valve being operable between a first position interconnecting said first port and said second port and a second position interconnecting said first port with said third port, said two-way valve moving between said first and second positions upon expiration and inspiration of the patient.

Claim 45

Dependent Claim 170 words

The transport ventilation system of claim 41 wherein said actuator means further includes: a valve body; a first port formed in said valve body connectable to a breathing circuit to communicate gas therebetween; a respiration bag connector associated with said valve body for sealed connection of a respiration bag thereto; a second port formed in said valve body positioned and connected to said respiration bag to communicate gas therebetween; a channel formed in said valve body to intercommunicate gas between said first port and said second port; actuator connection means associated with said valve body for sealed connection thereto of actuator means for intermittently actuating said respiratory bag; third port means formed in said valve body for interconnection to an external source of actuation signals; fourth port means formed in aid valve body positioned and connectable to said actuator means to communicate said actuation signals thereto; and second channel means formed in said valve body to intercommunicate said actuation signals between said third port means and said fourth port means.

Claim 46

Dependent Claim 124 words

The transport means of claim 42 wherein said ventilation machine means includes: first connector means for connection to an external source of pressurized gas at a supply pressure; pressure regulator means connected to receive the pressurized gas from said first connector means and to supply regulated gas, said pressure regulator means having means to control the pressure of the pressurized gas to be regulated gas at pressures at and below the supply pressure, as selected by the user; signal valve means connected to receive the regulated gas and to open and close in accordance with a preselected pattern to supply said inspiration signals when open and expiration signals when closed; and second connector means for connecting the signal valve means to said actuator means.

Claim 47

Dependent Claim 108 words

The transport ventilation system of claim 43 wherein said ventilation machine means further includes: mixing means interconnected to receive the regulated gas from said signal valve means, said mixing means having means to receive gas from a second source and mix the gas from said second source with the regulated gas to form signal gas; and check and vent means connected to receive and communicate the signal gas from said mixing means to said second connector means, to inhibit the flow of gas from said second connector means into said mixing means to the vent gas from said second connector means when said signal valve means is closed.

Claim 48

Dependent Claim 43 words

The transport ventilation system of claim 42 wherein the excessive gas pressure relief means includes vent means formed and positioned to vent gas from said first channel to outside the said valve body when the pressure of the gas exceeds a preselected pressure.

Claim 49

Dependent Claim 65 words

The transport ventilation system of claim 45 wherein said vent means includes a third channel having a first and second portion formed in said valve body, wherein said respiration bag has a vent portion sealably positioned in said channel between said first and second portion, said respiration bag being deformable at said preselected pressure to communicate gas from said first portion to said second portion.

Claim 50

Dependent Claim 84 words

The transport ventilation system of claim 45 wherein the means operated by the flow of gases from the reservoir means to the patient for blocking communication of the excessive gas pressure relief means includes a slide gate positioned in said first channel and movable from a first, normal position in which gas is communicated into said channel, to a second position to preclude gas from communication into said third channel during flow of gases in the first channel from the reservoir to the patient.

Claim 51

Dependent Claim 92 words

The transport ventilation system of claim 47 further including a first pressure sensing means formed and positioned within said valve body to sense pressure in said first channel between said first port and said slide gate, and a second pressure sensing means positioned and formed in said valve body to sense pressure in said first channel between said second port and said slide gate, whereby the flow rate of gases through the first channel may be determined based on the difference in pressure measured by the first and second pressure sensing means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-11-27	1993-05-29	1993-11-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-11-27	1997-05-29	1997-11-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-11-27	2001-05-29	2001-11-28	$7700.00	Window Closed / Lapsed

Disposable breathing system and components

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