GB2600741A - Air-purifying respirator cartridge - Google Patents

Air-purifying respirator cartridge Download PDF

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Publication number
GB2600741A
GB2600741A GB2017602.0A GB202017602A GB2600741A GB 2600741 A GB2600741 A GB 2600741A GB 202017602 A GB202017602 A GB 202017602A GB 2600741 A GB2600741 A GB 2600741A
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GB
United Kingdom
Prior art keywords
cartridge
compartment
inlet
outlet
respirator
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB2017602.0A
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GB202017602D0 (en
GB2600741B (en
Inventor
Akhter Mughal Humayun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SILICON CPV PLC
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SILICON CPV PLC
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Application filed by SILICON CPV PLC filed Critical SILICON CPV PLC
Priority to GB2017602.0A priority Critical patent/GB2600741B/en
Publication of GB202017602D0 publication Critical patent/GB202017602D0/en
Publication of GB2600741A publication Critical patent/GB2600741A/en
Application granted granted Critical
Publication of GB2600741B publication Critical patent/GB2600741B/en
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00—Filters for breathing-protection purposes
    • A62B23/02—Filters for breathing-protection purposes for respirators
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B19/00—Cartridges with absorbing substances for respiratory apparatus
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/006—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort with pumps for forced ventilation
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00—Respiratory apparatus
    • A62B7/10—Respiratory apparatus with filter elements

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Pulmonology (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

An air filter for an air-purifying respirator, the cartridge10 comprising a housing 12 having an intake compartment 14 and an exhaust compartment 24, where the intake compartment 14 comprises an inlet 16 for receiving incoming air from the surrounding environment. A filter medium 18 for filtering the incoming air, and an outlet 20 for providing the filtered incoming air to the respirator. Wherein the exhaust compartment 24 comprises and inlet 26 for received exhaled air from the respirator, a filter medium 28 for filtering the exhaled air, and an outlet 30 for discharging the filtered exhaled air to the surrounding environment.

Description

AIR-PURIFYING RESPIRATOR CARTRIDGE
The present invention relates to an air filter cartridge for an air-purifying respirator, to a filtration unit comprising the air filter cartridge, and to an air-purifying respirator comprising the filtration unit.
Respirators are intended to protect the wearer of the respirator from breathing in harmful airborne contaminates (e.g. dust particles, toxic aerosols and gases, viruses, bacteria, etc.), which may be present in the environment surrounding the wearer. Air-purifying respirators typically comprise a filter medium for filtering incoming air, with the filtered incoming air then being provided to the wearer. In contrast to the incoming air, air-purifying respirators typically rely on the escape of the wearer's exhaled air from the periphery of the respirator or else comprise an unfiltered one-way valve for expelling the wearer's exhaled air to the surrounding environment. However, these arrangements mean that others will not be protected from any airborne contaminants (e.g. viruses, bacteria, etc.) breathed out by the wearer of the respirator.
In many cases, air-purifying respirators are intended to be used for a limited period of time and then discarded. In other cases, the filter medium of the air-purifying respirator may be replaced periodically so as to extend the usable lifetime of the respirator. In these other cases, the filter medium can be provided as a replaceable sheet of material which is insertable into the respirator so as to filter the incoming air. However, prior to and during insertion, such sheets are susceptible to contamination, for example upon contact with unclean surfaces. Alternatively, the filter medium can be provided within a -2 -replaceable air filter cartridge which is connected onto the respirator so as to filter the incoming air. However, such cartridges tend to be bulky and can be cumbersome to replace.
It is desired to provide improvements relating to air filter cartridges for air-purifying respirators.
Thus, according to an aspect of the present invention there is provided an air filter cartridge for an air-purifying respirator, the cartridge comprising a housing having an intake compartment and an exhaust compartment, wherein the intake compartment comprises an inlet for receiving incoming air from the /0 surrounding environment, a filter medium for filtering the incoming air, and an outlet for providing the filtered incoming air to the respirator, and wherein the exhaust compartment comprises an inlet for receiving exhaled air from the respirator, a filter medium for filtering the exhaled air, and an outlet for discharging the filtered exhaled air to the surrounding environment.
As will be appreciated, by providing intake and exhaust compartments both having filter media, the cartridge of the present invention is able both to filter the incoming air so as to protect the wearer from airborne contaminates in the surrounding environment and to filter the outgoing air so as to protect others from airborne contaminants breathed out by the wearer. Furthermore, by providing the intake and exhaust compartments within the same housing, the filter media for both the incoming air and the outgoing air is protected from contamination by contact and can be replaced simultaneously, and thus quickly and conveniently, by replacement of a single replaceable cartridge. -3 -
In embodiments, the intake compartment and the exhaust compartment may be fluidly isolated from one another within the housing, for example by an internal wall of the housing. These embodiments can help to avoid the immediate recirculation of air from the exhaust compartment back to the intake compartment within the housing. The intake compartment and the exhaust compartment may be arranged side-by-side within the housing. These embodiments can provide for a more compact cartridge.
In embodiments, the inlet of the intake compartment may be adjacent to and/or substantially orthogonal to and/or substantially non-coplanar with the /0 outlet of the intake compartment. The direction of airflow into the inlet of the intake compartment may be substantially orthogonal to the direction of airflow out of the outlet of the intake compartment. Similarly, the inlet of the exhaust compartment may be adjacent to and/or substantially orthogonal to and/or substantially non-coplanar with the outlet of the exhaust compartment. The direction of airflow into the inlet of the exhaust compartment may be substantially orthogonal to the direction of airflow out of the outlet of the exhaust compartment. These embodiments can help to provide a more tortuous route through, and thus increase the efficiency of, the filter media.
In embodiments, the outlet of the intake compartment may be adjacent to and/or substantially parallel to and/or substantially coplanar with the inlet of the exhaust compartment. The direction of airflow out of the outlet of the intake compartment may be substantially opposite to and/or substantially parallel to the direction of airflow into the inlet of the exhaust compartment. These -4 -embodiments can help to provide for a more compact interface between the cartridge and the respirator.
In embodiments, the inlet of the intake compartment may be distal from and/or substantially parallel to and/or substantially non-coplanar with the outlet 5 of the exhaust compartment. The direction of airflow into the inlet of the intake compartment may be substantially the same as and/or substantially parallel to the direction of airflow out of the outlet of the exhaust compartment. These embodiments can help to reduce or avoid the immediate recirculation of air from the outlet of the exhaust compartment back to the inlet of the intake /0 compartment external to the housing.
In embodiments, the filter medium of the intake compartment and/or the filter medium of the exhaust compartment may comprise a mechanical (particulate) filter, a chemical (gas) filter, and/or a combined mechanical-chemical filter. The filter medium of the intake compartment may be distinct from the filter medium of the exhaust compartment. The filter medium of the intake compartment may or may not be of the same construction and/or composition as the filter medium of the exhaust compartment. For example, the same construction and/or composition may be used for convenience or different constructions and/or compositions may be used to provide different filtering and/or airflow characteristics for the incoming and outgoing air.
In embodiments, the inlet of the intake compartment, the outlet of the intake compartment, the inlet of the exhaust compartment, and/or the outlet of the exhaust compartment may each be a distinct inlet/outlet. The inlet of the intake compartment, the outlet of the intake compartment, the inlet of the -5 -exhaust compartment, and/or the outlet of the exhaust compartment may each have (e.g. a distinct set of) one or more grills and/or meshes. The one or more grills and/or meshes may allow the passage of air into or out of the compartment whilst retaining the filter medium within the compartment.
In embodiments, the outlet of the intake compartment may be surrounded by a seal. Similarly, the inlet of the exhaust compartment may be surrounded by a seal. These embodiments can help to maintain a substantially airtight interface between the cartridge and the respirator. The seal surrounding the outlet of the intake compartment may be distinct from the seal surrounding /0 the inlet of the exhaust compartment. The seal surrounding the outlet of the intake compartment may not surround the inlet of the exhaust compartment and/or the seal surrounding the inlet of the exhaust compartment may not surround the outlet of the intake compartment. These embodiments can help to isolate the filtered incoming air from the exhaled air.
According to another aspect of the present invention, there is provided a filtration unit comprising an air filter cartridge as described herein in any aspect or embodiment, the cartridge being removably receivable on and/or in the filtration unit, the filtration unit further comprising a cartridge inlet for receiving the filtered incoming air from the cartridge, a respirator outlet for providing the filtered incoming air to the respirator, a respirator inlet for receiving the exhaled air from the respirator, and a cartridge outlet for providing the exhaled air to the cartridge.
In embodiments, the outlet of the intake compartment may be aligned with the cartridge inlet of the filtration unit and/or the inlet of the exhaust -6 -compartment may be aligned with the cartridge outlet of the filtration unit. The cartridge inlet may be adjacent to and/or substantially parallel to and/or substantially coplanar with the cartridge outlet. The direction of airflow into the cartridge inlet may be substantially opposite to and/or substantially parallel to the direction of airflow out of the cartridge outlet. Again, these embodiments can help to provide a more compact interface between the cartridge and the respirator.
In embodiments, the filtration unit may comprise a casing having a cartridge compartment for removably receiving the cartridge therein. The /0 filtration unit may comprise a removable cover for the cartridge (e.g. for the cartridge compartment). The cover may have an inlet (e.g. one or more grills and/or meshes) which corresponds (e.g. in location and/or size and/or shape) to the inlet of the intake compartment of the cartridge. Similarly, the cover may have an outlet (e.g. one or more grills and/or meshes) which correspond (e.g. in location and/or size and/or shape) to the outlet of the exhaust compartment of the cartridge. These embodiments can allow the passage of air into and/or out of the cartridge through the cover. The cartridge and/or cover may be removably secured in place with respect to the filtration unit with one or more mechanical fasteners, such as clips and/or screws. The mechanical fasteners may be releasable by operation of a lever. Where the cover comprises an inlet and/or outlet (e.g. one or more grills and/or meshes) and the one or more mechanical fasteners comprise one or more clips, the inlet and/or outlet (e.g. one or more grills and/or meshes) may serve the dual function of allowing the -7 -passage of air through the cover and clipping the cover on to the one or more clips.
In embodiments, the cartridge and/or filtration unit may be for a powered air-purifying respirator (PAPR). In these embodiments, the filtration unit may comprise an intake airflow generator (e.g. fan and/or impeller) for generating a flow of air from the cartridge inlet to the respirator outlet. The filtration unit may also or instead comprise an exhaust airflow generator (e.g. fan and/or impeller) for generating a flow of air from the respirator inlet to the cartridge outlet. The filtration unit may comprise an intake conduit between the cartridge inlet and the respirator outlet. The intake airflow generator may be located in the intake conduit. Similarly, the filtration unit may comprise an exhaust conduit between the respirator inlet and the cartridge outlet. The exhaust airflow generator may be located in the exhaust conduit. The intake conduit may be fluidly isolated from the exhaust conduit along the length of the conduits. The intake conduit may be distinct from the exhaust conduit. The intake airflow generator may be distinct from the exhaust airflow generator. These embodiments can help to isolate the filtered incoming air from the exhaled air. The filtration unit may comprise a motor for operating the intake airflow generator and/or exhaust airflow generator. The filtration unit may comprise a power supply, such as a battery, for powering the (e.g. motor of the) intake airflow generator and/or exhaust airflow generator. The power supply may be replaceable and/or rechargeable.
In embodiments, the filtration unit may comprise a control panel for controlling the operation of the filtration unit. The control panel may comprise
- -
one or more of an on-off switch, a flowrate selector and/or one or more operational mode (e.g. flowrate) indicators, for example in the form of one or more LEDs.
In embodiments, the filtration unit may be wearable. The filtration unit may comprise a mounting structure for mounting the filtration unit to the wearer.
The mounting structure may be for mounting the filtration unit to the wearer's waist, for example via a belt. For example, the mounting structure may comprise one or more belt loops and/or clips.
According to another aspect of the present invention, there is provided a respirator comprising a filtration unit as described herein in any aspect or embodiment, the respirator further comprising a face covering, the face covering comprising a unit inlet for receiving filtered incoming air from the filtration unit and providing the filtered incoming air to the wearer of the respirator, and a unit outlet for receiving exhaled air from the wearer and providing the exhaled air to the filtration unit.
In embodiments, the face covering may comprise a hood (e.g. for covering the entire head of the wearer), full face mask (e.g. for covering the eyes, nose and mouth of the wearer) or half face mask (e.g. for covering the nose and mouth of the wearer). A forward-facing side of the face covering may have a visually transparent window. The unit inlet and/or unit outlet may be located at a rearward-facing side of the face covering. These embodiments can help to provide the wearer with an unobstructed forward view.
In embodiments, the unit inlet of the respirator may be fluidly connected to the respirator outlet of the filtration unit by an intake tube (e.g. hose). -9 -
Similarly, the unit outlet of the respirator may be fluidly connected to the respirator inlet of the filtration unit by an exhaust tube (e.g. hose). The intake tube may be fluidly isolated from the exhaust tube along the length of the tubes. The intake tube may be distinct from the exhaust tube. These embodiments can help to isolate the filtered incoming air from the exhaled air.
By way of example only, embodiments of the present invention will now be described in detail with reference being made to the accompanying drawings in which: Figure 1 is a front perspective view of a cartridge according to an /0 embodiment of the present invention; Figure 2 is a rear perspective view of the cartridge of Figure 1; Figure 3 is a rear perspective view of a filtration unit comprising the cartridge of Figures 1 and 2 when disassembled; Figure 4 is a rear perspective view of the filtration unit of Figure 3 when 15 assembled; Figure 5 is a front perspective view of a respirator hood for use with the filtration unit of Figures 3 and 4; and Figure 6 is a rear perspective view of the respirator hood of Figure 5. Figures 1 and 2 show an air filter cartridge 10 for a powered air-purifying 20 respirator (PAPR). The cartridge 10 comprises a housing 12 having an air intake compartment 14. The intake compartment 14 comprises an inlet 16 in the form of a grill for receiving incoming air from the surrounding environment. The intake compartment 14 further comprises a filter medium 18 housed therein for filtering the incoming air received via the inlet 16. The intake compartment 14 -10 -further comprises an outlet 20 in the form of a grill for providing the filtered incoming air to the respirator. The inlet 16 is adjacent and orthogonal to the outlet 20 such that the direction of airflow into the inlet 16 is orthogonal to the direction of airflow out of the outlet 20 as indicated with the white arrows. The 5 outlet 20 of the intake compartment 14 is surrounded by a seal 22 for maintaining an airtight interface between the cartridge 10 and the respirator. The cartridge 10 further has an air exhaust compartment 24. The exhaust compartment 24 comprises an inlet 26 in the form of a grill for receiving exhaled air from the respirator. The exhaust compartment 24 further comprises a filter medium 28 housed therein for filtering the exhaled air received via the inlet 26. The exhaust compartment 24 further comprises an outlet 30 in the form of a grill for discharging the filtered exhaled air to the surrounding environment. The inlet 26 is adjacent and orthogonal to the outlet 30 such that the direction of airflow into the inlet 26 is orthogonal to the direction of airflow out of the outlet 30 as indicated with the black arrows. The inlet 26 of the exhaust compartment 24 is also surrounded by a seal 32 for maintaining an airtight interface between the cartridge 10 and the respirator.
As is shown, the intake compartment 14 and the exhaust compartment 24 are arranged side-by-side within the housing 12, but the intake compartment 14 and the exhaust compartment 24 are fluidly isolated from one another within the housing 12 by an internal wall 34. The outlet 20 of the intake compartment 14 is adjacent to and is coplanar with the inlet 26 of the exhaust compartment 24 such that the direction of airflow out of the outlet 20 of the intake compartment 14 is opposite and parallel to the direction of airflow into the inlet 26 of the exhaust compartment 24. This provides a compact interface between the cartridge 10 and the respirator. In contrast, the inlet 16 of the intake compartment 14 is distal to and non-coplanar with the outlet 30 of the exhaust compartment 24 such that the direction of airflow into the inlet 16 of the intake 5 compartment 14 is the same as and parallel to the direction of airflow out of the outlet 30 of the exhaust compartment 24. This reduces or avoids the immediate recirculation of air from the outlet 30 of the exhaust compartment 24 back to the inlet 16 of the intake compartment 14 external to the housing 12. In this embodiment, the filter media 18, 28 are mechanical filter media for filtering out 10 particulate contaminates, but other filter media can be used in other embodiments.
Figures 3 and 4 show a filtration unit 36 comprising the cartridge 10. The filtration unit 36 comprises a casing 38 having a cartridge compartment 39 for removably receiving the cartridge 10. The casing 38 comprises a cartridge inlet 40 for receiving the filtered incoming air from the cartridge 10 and a respirator outlet 42 for providing the filtered incoming air to the respirator via an intake tube 44. The cartridge inlet 40 is fluidly connected to the respirator outlet 42 via an intake conduit (not visible) within the casing 38. An intake airflow generator in the form of a motor-driven fan (not visible) is located in the intake conduit.
The casing 38 further comprises a respirator inlet 46 for receiving exhaled air from the respirator via an exhaust tube 48 and a cartridge outlet 50 for providing the exhaled air to the cartridge 10. The respirator inlet 46 is fluidly connected to the cartridge outlet 50 via an exhaust conduit (not visible) within the casing 38. An exhaust airflow generator in the form of a motor-driven fan (not visible) is also located in the exhaust conduit. The cartridge inlet 40 is adjacent to and coplanar with the cartridge outlet 50 such that the direction of airflow into the cartridge inlet 40 is opposite and parallel to the direction of airflow out of the cartridge outlet 50. Again, this provides a compact interface between the cartridge 10 and the respirator.
The filtration unit 36 further comprises a removable cover 52 for the cartridge compartment 39. The cover 52 has grills 54, 56 which correspond in location, size and shape to the inlet 16 of the intake compartment 14 of the cartridge 10 and the outlet 30 of the exhaust compartment 24 of the cartridge /0 10, respectively. The cover 52, and thus cartridge 10, are removably secured in place with respect to the filtration unit 36 via mechanical fasteners 58 in the form of clips which engage with the grills 54, 56. The mechanical fasteners 58 are releasable by operation of a lever 59. The filtration unit 36 further comprises a power supply (not visible) in the form of a rechargeable battery for powering the airflow generators. The filtration unit 36 further comprises a control panel 60 for controlling the operation of the filtration unit 36. The control panel 60 comprises an on-off switch, a flowrate selector and operational mode indicators in the form of LEDs. The filtration unit 36 further comprises mounting structures 61 in the form of belt loops which allow the filtration unit 36 to be mounted to the wearer's waist via a belt (not shown).
Figures 5 and 6 show a face covering 62 in the form of a respirator hood 64 for use with the filtration unit 36. The forward-facing side of the hood 64 has a visually transparent window 66 to allow the wearer to see out of the hood 64. The rearward-facing side of the hood 64 has a unit inlet 68 that receives filtered incoming air from the filtration unit 36 via the intake tube 44 and that provides the filtered incoming air to the wearer of the respirator. The rearward-facing side of the hood 64 also has a unit outlet 70 that receives exhaled air from the wearer and that provides the exhaled air to the filtration unit 36 via the exhaust tube 48.

Claims (25)

  1. CLAIMS1. An air filter cartridge for an air-purifying respirator, the cartridge comprising a housing having an intake compartment and an exhaust compartment, wherein the intake compartment comprises an inlet for receiving incoming air from the surrounding environment, a filter medium for filtering the incoming air, and an outlet for providing the filtered incoming air to the respirator, and wherein the exhaust compartment comprises an inlet for receiving exhaled air from the respirator, a filter medium for filtering the exhaled air, and an outlet for discharging the filtered exhaled air to the surrounding /0 environment.
  2. 2. A cartridge as claimed in claim 1, wherein the intake compartment and the exhaust compartment are fluidly isolated from one another within the housing.
  3. 3. A cartridge as claimed in claim 1 or 2, wherein the intake compartment and the exhaust compartment are arranged side-by-side within the housing.
  4. 4. A cartridge as claimed in claim 1, 2 or 3, wherein the inlet of the intake compartment is adjacent to and/or substantially orthogonal to and/or substantially non-coplanar with the outlet of the intake compartment.
  5. 5. A cartridge as claimed in any one of the preceding claims, wherein the inlet of the exhaust compartment is adjacent to and/or substantially orthogonal to and/or substantially non-coplanar with the outlet of the exhaust compartment.
  6. 6. A cartridge as claimed in any one of the preceding claims, wherein the outlet of the intake compartment is adjacent to and/or substantially parallel to and/or substantially coplanar with the inlet of the exhaust compartment.
  7. 7.A cartridge as claimed in any one of the preceding claims, wherein the inlet of the intake compartment is distal from and/or substantially parallel to and/or substantially non-coplanar with the outlet of the exhaust compartment
  8. 8. A cartridge as claimed in any one of the preceding claims, wherein the filter medium of the intake compartment and/or the filter medium of the exhaust compartment comprises a mechanical filter.
  9. 9. A cartridge as claimed in any one of the preceding claims, wherein the filter medium of the intake compartment and/or the filter medium of the exhaust compartment comprises a chemical filter.
  10. 10. A cartridge as claimed in any one of the preceding claims, wherein the filter medium of the intake compartment is distinct from the filter medium of the exhaust compartment.
  11. 11. A cartridge as claimed in any one of the preceding claims, wherein the outlet of the intake compartment is surrounded by a seal and/or wherein the inlet of the exhaust compartment is surrounded by a seal.
  12. 12 A cartridge as claimed in claim 11, wherein the seal surrounding the outlet of the intake compartment is distinct from the seal surrounding the inlet of the exhaust compartment.
  13. 13. A cartridge as claimed in claim 11 or 12, wherein the seal surrounding the outlet of the intake compartment does not surround the inlet of the exhaust compartment and/or wherein the seal surrounding the inlet of the exhaust compartment does not surround the outlet of the intake compartment.
  14. 14. A filtration unit comprising an air filter cartridge as claimed in any one of the preceding claims, the cartridge being removably receivable on and/or in the filtration unit, the filtration unit further comprising a cartridge inlet for receiving the filtered incoming air from the cartridge, a respirator outlet for providing the filtered incoming air to the respirator, a respirator inlet for receiving the exhaled air from the respirator, and a cartridge outlet for providing the exhaled air to the cartridge.
  15. 15. A filtration unit as claimed in claim 14, wherein the outlet of the intake compartment is aligned with the cartridge inlet of the filtration unit and/or wherein the inlet of the exhaust compartment is aligned with the cartridge outlet of the filtration unit./0
  16. 16. A filtration unit as claimed in claim 14 or 15, wherein the filtration unit comprises a casing having a cartridge compartment for removably receiving the cartridge therein.
  17. 17. A filtration unit as claimed in claim 14, 15 or 16, wherein the filtration unit comprises a removable cover for the cartridge.
  18. 18. A filtration unit as claimed in claim 17, wherein the cover has an inlet which corresponds to the inlet of the intake compartment of the cartridge.
  19. 19. A filtration unit as claimed in claim 17 or 18, wherein the cover has an outlet which corresponds to the outlet of the exhaust compartment of the cartridge.
  20. 20. A filtration unit as claimed in any one of claims 14-19, wherein the cartridge is removably secured in place with respect to the filtration unit with one or more mechanical fasteners.
  21. 21. A filtration unit as claimed in any one of claims 14-20, wherein the filtration unit comprises an intake airflow generator for generating a flow of air from the cartridge inlet to the respirator outlet and/or wherein the filtration unit comprises an exhaust airflow generator for generating a flow of air from the respirator inlet to the cartridge outlet.
  22. 22. A respirator comprising a filtration unit as claimed in any one of claims 14-21, the respirator further comprising a face covering, the face covering comprising a unit inlet for receiving filtered incoming air from the filtration unit and providing the filtered incoming air to the wearer of the respirator, and a unit outlet for receiving exhaled air from the wearer and providing the exhaled air to the filtration unit.fio
  23. 23. A respirator as claimed in claim 22, wherein the face covering comprises a hood, full face mask or half face mask.
  24. 24. A respirator as claimed in claim 22 or 23, wherein the unit inlet and/or unit outlet is located at a rearward-facing side of the face covering.
  25. 25. A respirator as claimed in claim 22, 23 or 24, wherein the unit inlet of the respirator is fluidly connected to the respirator outlet of the filtration unit by an intake tube and/or wherein the unit outlet of the respirator is fluidly connected to the respirator inlet of the filtration unit by an exhaust tube.
GB2017602.0A 2020-11-06 2020-11-06 Air-purifying respirator cartridge Active GB2600741B (en)

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Application Number Priority Date Filing Date Title
GB2017602.0A GB2600741B (en) 2020-11-06 2020-11-06 Air-purifying respirator cartridge

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Application Number Priority Date Filing Date Title
GB2017602.0A GB2600741B (en) 2020-11-06 2020-11-06 Air-purifying respirator cartridge

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GB202017602D0 GB202017602D0 (en) 2020-12-23
GB2600741A true GB2600741A (en) 2022-05-11
GB2600741B GB2600741B (en) 2023-02-08

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009225A (en) * 1989-11-30 1991-04-23 Boehringer Mannheim Corporation Personal ventilating system
US5042474A (en) * 1990-04-16 1991-08-27 Williamson Ian M Self-contained clean room respiration system with breathed air exhausting
US20080245364A1 (en) * 2007-04-03 2008-10-09 Keith Patterson Filtering respirator with nasal and oral separation
DE102018100473A1 (en) * 2018-01-10 2019-07-11 Fischer Planning Ltd. Respiratory protection device
CN111111038A (en) * 2020-03-09 2020-05-08 代福民 Convenient double-air valve double-channel deep gas mask

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5009225A (en) * 1989-11-30 1991-04-23 Boehringer Mannheim Corporation Personal ventilating system
US5042474A (en) * 1990-04-16 1991-08-27 Williamson Ian M Self-contained clean room respiration system with breathed air exhausting
US20080245364A1 (en) * 2007-04-03 2008-10-09 Keith Patterson Filtering respirator with nasal and oral separation
DE102018100473A1 (en) * 2018-01-10 2019-07-11 Fischer Planning Ltd. Respiratory protection device
CN111111038A (en) * 2020-03-09 2020-05-08 代福民 Convenient double-air valve double-channel deep gas mask

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GB2600741B (en) 2023-02-08

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