WO1993020896A1 - System for handling and monitoring respiratory waste streams - Google Patents

System for handling and monitoring respiratory waste streams Download PDF

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Publication number
WO1993020896A1
WO1993020896A1 PCT/US1993/003198 US9303198W WO9320896A1 WO 1993020896 A1 WO1993020896 A1 WO 1993020896A1 US 9303198 W US9303198 W US 9303198W WO 9320896 A1 WO9320896 A1 WO 9320896A1
Authority
WO
WIPO (PCT)
Prior art keywords
solids
liquids
filter media
gas
output port
Prior art date
Application number
PCT/US1993/003198
Other languages
French (fr)
Inventor
Lane F. Beard
Daniel I. Disch
John G. Storch
Original Assignee
Criticare Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Criticare Systems, Inc. filed Critical Criticare Systems, Inc.
Publication of WO1993020896A1 publication Critical patent/WO1993020896A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A61M16/0808—Condensation traps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A61B5/097—Devices for facilitating collection of breath or for directing breath into or through measuring devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/106—Filters in a path
    • A61M16/1065—Filters in a path in the expiratory path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/483—Physical analysis of biological material
    • G01N33/497—Physical analysis of biological material of gaseous biological material, e.g. breath
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/75—General characteristics of the apparatus with filters
    • A61M2205/7536—General characteristics of the apparatus with filters allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N2001/2244—Exhaled gas, e.g. alcohol detecting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00—Surgery
    • Y10S128/912—Connections and closures for tubes delivering fluids to or from the body

Definitions

  • the present invention is generally concerned with sampling, handling and disposing of a respiratory waste stream of a patient under medical care. More particularly, the invention is concerned with a respiratory waste system for separating gas from liquids, solids and viscous fluids in a patient's respiratory waste stream.
  • FIGURE 1 A illustrates a system for monitoring and/or handling a patient's expired respiratory stream and FIG- IB shows an enlarged view of a trap device in FIG. 1 A;
  • FIGURE 2 depicts a filter portion of the system shown in FIG. 1A;
  • FIGURE 3 illustrates a cross section taken along line 3-3 in FIG.2;
  • FIGURE 4 depicts a prior art filter element in a system for monitoring and/or handling a patient's respiratory circuit.
  • a system for monitoring and/or handling an expired respiratory stream of a patient is shown generally at 10 in FIG. 1A.
  • the system 10 can include means for providing input fluid to a patient's respiratory circuit or system.
  • Such means can be, for example, an endotracheal tube 12 disposed in the patient's airway.
  • the means can be a cannula 13 and face mask 14 (shown in phantom in FIG. 1) placed over the patient's nose and mouth.
  • a means for providing an output path for expired respiratory waste can be, for example, the endotracheal tube 12 serving both input and output functions or a separate tube 16 can be provided.
  • Other conventional arrangements can also be used to effectuate the input and output functions described above.
  • Means for filtering and handling the expired respiratory waste can be, for example, a filter 18 shown generally in FIG. 1 A and in detail in FIG. 2.
  • the filter 18 includes an input port 20 on a first side 22 of a filter media 24.
  • An example of such a filter media 24 is a porous membrane (e.g.. a Filtertek part number 63160 PTFE filter in a housing) having a pore size of approximately 0.1 to 1.0 microns, although the pore size is not critical to the invention.
  • the filter media 24 functions to allow passage of gas only, being impervious to flow of fluids and solids. Therefore, the filter 18 causes the fluids and solids input through the input port 20 to pass through a first chamber 26 to a first output port 28. These fluids and/or solids are output to a trap device 30 to be described in more detail hereinafter.
  • the gas in the expired respiratory stream is passed through the filter media 24 into a second side 32 having a second chamber 34.
  • a second output port 36 receives the gas and transfers the gas to an analytical unit 38 for analysis.
  • the system 10 can function to modify the fluid input by a gas system 40 to the patient, responsive to the analysis of the expired respiratory stream.
  • the input fluid can include, for example, humidified oxygen and/or oxygen/nitrogen, an anesthetic gas and a gas containing a drug for medical treatment of the patient.
  • the filter 18 further includes a construction of the first side 22 which enables preferential removal of solids and viscous fluids occluding first surface 42 of the filter media 24.
  • first side 22 which enables preferential removal of solids and viscous fluids occluding first surface 42 of the filter media 24.
  • the injected fluid enters the filter 18 through the input port 20 into the first chamber 26.
  • the first chamber 26 has a passageway geometry enabling the pressurized input liquids to preferentially flow across the first surface 42 through at least part of the solids and/or viscous fluids 50 occluding the filter media 24 (see cleared path 52 in FIG. 3).
  • the solids and/or viscous liquids 50 removed are forced to flow out the first output port 28 to the trap device 30. Therefore, the passageway geometry includes the first chamber 26 having an opening which is a disk type shape and having one dimension, such as the thickness perpendicular to the filter media 24, substantially less than the other two dimensions of the first chamber 26.
  • the first chamber 26 can include a restrictive channel opening, such as a nozzle shape or restrictive opening 52 (in phantom in FIG.3), to cause the preferential flow of the injected fluid enabling removal of the occluding solids and/or viscous fluids from the first surface 42.
  • the waste solids, fluids and viscous liquids removed by the injected fluid are output from the first output port 28 through output line 56 to the trap device 30. Operation and use of this trap device 30 is explained in U.S. Pat- No. 4,924,860 which is incorporated by reference herein.
  • An improvement over the invention described in the '860 patent includes a baffle 58 (see FIG. IB) disposed in conduit 60 between separation chamber 62 and sealing filter 64. The baffle 58 prevents inadvertent splashing of the sealing filter 64 which seals upon exposure to sufficient moisture levels indicative of a -full water trap.
  • the system 10 exhibits substantial performance advantages over prior art systems and Table I below illustrates the lifetime for filter devices of the invention compared to currently used prior art devices of the applicant having an operating lifetime of less than about one case hour.

Abstract

A system (10) for handling and disposing of a respiratory waste of a patient. The system (10) includes an output line (12) for receiving expired respiratory waste from the patient, and a filter device (18) for filtering and handling the expired respiratory waste. The filter device (18) includes an input port (20), a first chamber (26), a first output port (28) for liquids and solids, and a second output port (36) for outputting gas passed through the filter device (18).

Description

SYSTEM FOR HANDLING AND MONITORING RESPIRATORY WASTE STREAMS
The present invention is generally concerned with sampling, handling and disposing of a respiratory waste stream of a patient under medical care. More particularly, the invention is concerned with a respiratory waste system for separating gas from liquids, solids and viscous fluids in a patient's respiratory waste stream.
During and after surgical procedures it is important to monitor and/or control a patient's respiratory circuit to insure optimum recovery conditions for the patient. Numerous systems exist to carry out such functionalities, but all such systems suffer from frequent stoppage arising primarily from clogging of the system by mucous, blood and other materials secreted by the patient's respiratory system arising from surgery or from other trauma to the patient's respiratory circuit. Some attempts to alleviate this problem have involved usage of complex, dedicated systems which suffer from the disadvantage that the system must be disinfected after each patient usage. Other attempted solutions involve using disposable components which results in the need to make very frequent changes of the disposable components which are easily clogged by a patient's respiratory waste. These forms of disposable components necessitate frequent manual labor intervention and stoppage of the system monitoring and/or controlling the patient's respiratory circuit.
It is therefore an object of the invention to provide an improved method and apparatus for monitoring and/or controlling a patient's respirator}' circuit.
It is another object of the invention to provide a novel system for handling and disposing of the respiratory waste of a patient.
It is a further object of the invention to provide an improved system and method for filtering gas from liquids, solids and viscous fluids in a patient's expired respiratory stream.
It is an additional object of the invention to provide a novel filter device having a design enabling removal of solids or viscous fluids occluding the filter media.
It is yet another object of the invention to provide an improved system and method for filtering an expired respiratory stream and trapping liquids, solids or viscous fluids present in the expired respiratory stream. Various features of the invention are set forth in the drawings described herein below wherein like elements have like numerals throughout the drawings.
Description of the Drawings
FIGURE 1 A illustrates a system for monitoring and/or handling a patient's expired respiratory stream and FIG- IB shows an enlarged view of a trap device in FIG. 1 A;
FIGURE 2 depicts a filter portion of the system shown in FIG. 1A;
FIGURE 3 illustrates a cross section taken along line 3-3 in FIG.2; and
FIGURE 4 depicts a prior art filter element in a system for monitoring and/or handling a patient's respiratory circuit.
Other objects and advantages of the invention are included in the following detailed description and claims set forth thereafter.
Detailed Description of Preferred Embodiments
A system for monitoring and/or handling an expired respiratory stream of a patient is shown generally at 10 in FIG. 1A. The system 10 can include means for providing input fluid to a patient's respiratory circuit or system. Such means can be, for example, an endotracheal tube 12 disposed in the patient's airway. Alternatively, the means can be a cannula 13 and face mask 14 (shown in phantom in FIG. 1) placed over the patient's nose and mouth. A means for providing an output path for expired respiratory waste can be, for example, the endotracheal tube 12 serving both input and output functions or a separate tube 16 can be provided. Other conventional arrangements can also be used to effectuate the input and output functions described above.
Means for filtering and handling the expired respiratory waste can be, for example, a filter 18 shown generally in FIG. 1 A and in detail in FIG. 2. The filter 18 includes an input port 20 on a first side 22 of a filter media 24. An example of such a filter media 24 is a porous membrane (e.g.. a Filtertek part number 63160 PTFE filter in a housing) having a pore size of approximately 0.1 to 1.0 microns, although the pore size is not critical to the invention. The filter media 24 functions to allow passage of gas only, being impervious to flow of fluids and solids. Therefore, the filter 18 causes the fluids and solids input through the input port 20 to pass through a first chamber 26 to a first output port 28. These fluids and/or solids are output to a trap device 30 to be described in more detail hereinafter.
The gas in the expired respiratory stream is passed through the filter media 24 into a second side 32 having a second chamber 34. A second output port 36 receives the gas and transfers the gas to an analytical unit 38 for analysis. The system 10 can function to modify the fluid input by a gas system 40 to the patient, responsive to the analysis of the expired respiratory stream. The input fluid can include, for example, humidified oxygen and/or oxygen/nitrogen, an anesthetic gas and a gas containing a drug for medical treatment of the patient.
The filter 18 further includes a construction of the first side 22 which enables preferential removal of solids and viscous fluids occluding first surface 42 of the filter media 24. During monitoring and handling of the patient's expired respiratory stream, significant quantities of mucous, blood and other waste secretions are carried into the respiratory stream. Such waste products eventually lead to occlusion or clogging of the filter media 24, blocking flow of the gas through the filter media 24. The system can be reactivated by input of fluid, such as water under pressure, into injection port 44 or by removal of fittings 46 and input into line 48.
The injected fluid enters the filter 18 through the input port 20 into the first chamber 26. The first chamber 26 has a passageway geometry enabling the pressurized input liquids to preferentially flow across the first surface 42 through at least part of the solids and/or viscous fluids 50 occluding the filter media 24 (see cleared path 52 in FIG. 3). The solids and/or viscous liquids 50 removed are forced to flow out the first output port 28 to the trap device 30. Therefore, the passageway geometry includes the first chamber 26 having an opening which is a disk type shape and having one dimension, such as the thickness perpendicular to the filter media 24, substantially less than the other two dimensions of the first chamber 26. In other forms of the invention the first chamber 26 can include a restrictive channel opening, such as a nozzle shape or restrictive opening 52 (in phantom in FIG.3), to cause the preferential flow of the injected fluid enabling removal of the occluding solids and/or viscous fluids from the first surface 42. The waste solids, fluids and viscous liquids removed by the injected fluid are output from the first output port 28 through output line 56 to the trap device 30. Operation and use of this trap device 30 is explained in U.S. Pat- No. 4,924,860 which is incorporated by reference herein. An improvement over the invention described in the '860 patent includes a baffle 58 (see FIG. IB) disposed in conduit 60 between separation chamber 62 and sealing filter 64. The baffle 58 prevents inadvertent splashing of the sealing filter 64 which seals upon exposure to sufficient moisture levels indicative of a -full water trap.
The system 10 exhibits substantial performance advantages over prior art systems and Table I below illustrates the lifetime for filter devices of the invention compared to currently used prior art devices of the applicant having an operating lifetime of less than about one case hour.
TABLE I
Comparison of Case Hour Operation of Prior Art System to Invention Operation Performance
A. A humidified operating room environment using applicant's unit without the invention:
Number of samples: 12
Mean Lifetime: 0.64± .46 case hours
Standard Deviations: -2 -I +1 +2 +3 Number of Samples: 0 8 2 1 1
B. A humidified operating room environment with unit including the invention:
Number of samples: 28
Mean Lifetime: 57.4± 27.7 case hours
Standard Deviations: -3 -2 -1 +1 +2 Number of Samples: 1 3 6 13 5 (This data is believed to include as many as four units which are without the invention and explains some of the data at low performance levels.)
C. An intensive care unit environment including humidification and normally producing mucous output from the patient.
Number of samples: 37
Mean Lifetime: 84.3± 72 continuous hours
Standard Deviations: -2 -1 +1 +2 Number of Samples: 13 2 14 8
While preferred embodiments of the invention have been shown and described, it will be clear to those skilled in the art that various changes and modifications can be made without departing from the invention in its broader aspects as set forth in the claims provided hereinafter.

Claims

1. A system for handling and disposing of respiratory waste of a patient, comprising: means for providing input fluid to a patient's respiratory circuit; means for providing an output path for expired respiratory waste from said patient's respiratory circuit; means for filtering and handling said expired respiratory waste and coupled to said means for providing an output path for expired respiratory waste, said filtering means comprising:
(a) an input port directing expired respiratory waste into a first side of a filter media for separating a gas from liquids, solids and viscous fluids in said expired respiratory waste;
(b) a first chamber on said first side of said filter media;
(c) a first output port for receiving said liquids and solids input on said first side of said filter media;
(d) a second side of said filter media having a second chamber; and
(e) a second output port on said second side of said filter media for outputting said gas through said filter media; said first chamber having a passageway geometry enabling pressurized input liquids to preferentially flow from said input port across the surface of said filter media and through at least part of said solids or viscous fluids occluding said filter mediate flow out said first output port.
2. The system as defined in Claim 1 wherein said input fluid comprises a humidified gas.
3. The system as defined in Claim 1 wherein said pressurized input liquids comprise fluid for flushing said solids and viscous fluids occluding said filter media.
4. The system as defined in Claim 1 wherein said passageway geometry comprises an opening having one dimension substantially less than the other two dimensions characterizing said passageway.
5. ' The system as defined in Claim 1 wherein said passageway comprises a disk shaped opening adjacent said filter media.
6. The system as defined in Claim 5 wherein said disk has a thickness of less than about ten percent of the diameter of said disk.
7. The system as defined in Claim 1 wherein said passageway geometry comprises a restrictive channel opening disposed within said first chamber.
8. The system as defined in Claim 1 further including means coupled to said filtering means for trapping at least one of liquids, solids or viscous fluids received from said filtering means and for outputting said gas received from said filtering means.
9. The system as defined in Claim 1 wherein said pressurized input liquids preferentially flowing across said filter media surface carries said occluding solids and viscous fluids therewith.
10. A system for handling and disposing of respiratory waste of a patient, comprising: means for providing an output path for expired respiratory waste from a patient's respiratory circuit; means for filtering and handling said expired respiratory waste and coupled to said means for providing an output path, said filtering means comprising:
(a) means for separating gas from liquids, solids and viscous fluids in said respiratory waste, including an output port for removal of at least one of liquids, solids and viscous fluids from said filtering means; and
(b) means for causing fluid injected into said patient's respiratory circuit to preferentially flow into said filtering means through at least part of the solids or viscous fluids occluding said filtering means to open a passageway for flow of injected fluid through said filtering means and out said output port.
11. The system as defined in Claim 10 further including means for providing input fluid to a patient's respiratory circuit, said input fluid at least one of humidified gas, an anesthetic containing gas and a gas containing a treatment drug.
12. The system as defined in Claim 10 further including a gas output port for removal of gases passed through said filtering means.
13. The system as defined in Claim 10 further including means coupled to said filtering means for trapping liquids, solids or viscous fluids passing through said output port and for outputting said gas received from said filtering means.
14. The system as defined in Claim 10 wherein said means for separating gas from liquids, solids and viscous fluids comprises a gas/liquid filter barrier.
15. The system as defined in Claim 10 wherein said means for causing preferential flow comprises a narrow passageway between the opening to said filtering means and said liquid output port.
16. The system as defined in Claim 10 wherein said means for separating gas from liquids, solids and viscous fluids comprises:
(a) an input port directing expired respiratory waste into a first side of a filter barrier for separating gas from liquids, solids and viscous fluids;
(b) a first open chamber on said first side of said filter barrier;
(c) a first output port for receiving said liquids, solids or viscous solids on said first side of said filter barrier;
(d) a second side of said filter barrier having a second open chamber; and
(e) a second output port on said second side for outputting said gas passed through said filter media.
17. The system as defined in Claim 16 wherein said passageway geometry comprises an opening having one dimension substantially less than the other two dimensions characterizing said passageway.
18. The system as defined in Claim 17 wherein said passageway comprises a disk shape.
19. A device for filtering liquids, solids and viscous fluids from an expired respiratory waste stream from a patient, comprising: an input port directing expired respiratory waste into a first side of a filter media for separating gas from said liquids, solids or viscous liquids; a first chamber on said first side of said filter media; a first output port for receiving said liquids, solids or viscous liquids on said first side of said filter media; a second side of said filter media having a second open chamber; and a second output port on said second filter media side for receiving said gas passed through said filter media, said first chamber having a geometry forcing injected liquid to preferentially flow from said input port across at least part of the surface of said filter media and said injected liquid clearing and carrying therewith said solids or viscous fluids occluding said filter media to flow out said first output port.
20. The device as defined in Claim 19 wherein said filter media is impervious to liquids, solids and viscous liquids while allowing passage of gases.
21. The device as defined in Claim 19 further including means coupled to said device for filtering for trapping liquids, solids or viscous fluids received from said first output port of said filtering device and for outputting said gas received from said second output port of said filtering device.
22. The device as defined in Claim 19 further including means for providing said injected fluid to the patient for clearing said occluding solids or viscous liquids from said filtering means.
23. A system for analyzing a gas sample of a patient from a patient's expired respiratory stream, comprising: means for providing an output path for the expired respiratory stream from the patient; means coupled to said output path means for sampling at least part of the expired respiratory stream and including means for filtering and handling the expired respiratory stream, comprising:
(a) a filter media for separating the gas sample from liquids, solids and viscous fluids in the expired respiratory stream and including an input port on a first side of said filter media;
(b) a first chamber on said first side of said filter media;
(c) a first output port on said first side of said filter media for receiving the liquids, viscous fluids and solids in the respiratory stream;
(d) a second side of said filter media having an associated second chamber; and
(e) a second output port on said second filter media side for outputting the gas passed through said filter media; said first chamber including means for causing injected liquids to preferentially flow from said input port to said first output port along a path in contact with a surface of said filter media in said first chamber and through at least part of the respiratory stream solids or viscous fluids occluding said filter media to clear a flow path for the gas, the liquids, the viscous fluids and the solids in the expired respiratory stream; and means for performing analysis of the gas output from said second output port.
24. The system as defined in Claim 23 further including means for performing analysis of a least part of the liquids and solids received from said first output port.
25. The system as defined in Claim 23 wherein said means for causing preferential flow of liquids comprises a geometry for said first chamber forming a fluid flow path of least resistance along the surface of said filter media between said first input port and said first output port.
26. The system as defined in Claim 25 wherein said geometry comprises a substantially flat plate like opening for said first chamber.
27. A system for handling and disposing of respiratory waste of a patient, comprising: means for providing an input and an output path for fluid flow to and from a patient's respiratory circuit; means for filtering and handling the fluid flow; and means coupled to said filtering means for trapping at least one of liquids, solids or viscous fluids received from said filtering means and said coupled means for trapping including a baffle disposed between a separation chamber and a water sensitive seal for preventing premature sealing by said water sensitive seal being exposed to water agitation from said separation chamber.
PCT/US1993/003198 1992-04-09 1993-04-06 System for handling and monitoring respiratory waste streams WO1993020896A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/865,978 US5368021A (en) 1992-04-09 1992-04-09 System for handling and monitoring respiratory waste streams
US07/865,978 1992-04-09

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AU (1) AU4046893A (en)
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