SE542510C2 - Ventilation system for operating room - Google Patents

Ventilation system for operating room

Info

Publication number
SE542510C2
SE542510C2 SE1851211A SE1851211A SE542510C2 SE 542510 C2 SE542510 C2 SE 542510C2 SE 1851211 A SE1851211 A SE 1851211A SE 1851211 A SE1851211 A SE 1851211A SE 542510 C2 SE542510 C2 SE 542510C2
Authority
SE
Sweden
Prior art keywords
unit
exhausting
operating room
air
ventilation system
Prior art date
Application number
SE1851211A
Other languages
Swedish (sv)
Other versions
SE1851211A1 (en
Inventor
Anders Rehn
Bengt Cederlund
Original Assignee
Eir Clinical Ab
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 Eir Clinical Ab filed Critical Eir Clinical Ab
Priority to SE1851211A priority Critical patent/SE542510C2/en
Priority to EP19789878.6A priority patent/EP3860544A1/en
Priority to PCT/EP2019/076908 priority patent/WO2020070285A1/en
Publication of SE1851211A1 publication Critical patent/SE1851211A1/en
Publication of SE542510C2 publication Critical patent/SE542510C2/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G10/00—Treatment rooms or enclosures for medical purposes
    • A61G10/02—Treatment rooms or enclosures for medical purposes with artificial climate; with means to maintain a desired pressure, e.g. for germ-free rooms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G10/00—Treatment rooms or enclosures for medical purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A61G13/108—Means providing sterile air at a surgical operation table or area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G10/00—Treatment rooms or enclosures for medical purposes
    • A61G10/04—Oxygen tents ; Oxygen hoods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G12/00—Accommodation for nursing, e.g. in hospitals, not covered by groups A61G1/00 - A61G11/00, e.g. trolleys for transport of medicaments or food; Prescription lists
    • A61G12/002—Supply appliances, e.g. columns for gas, fluid, electricity supply
    • A61G12/004—Supply appliances, e.g. columns for gas, fluid, electricity supply mounted on the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Pulmonology (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Surgery (AREA)
  • Combustion & Propulsion (AREA)
  • Ventilation (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

The present invention relates to a ventilation system for an operating room. The operating room comprising a surgical Area (1), where the patient and surgical personnel (SI) are positioned during surgery, an anesthetics Area (3), where the anesthetics personnel (S3) are positioned during surgery, and a door (8) to an outside of the operating room. The ventilation system comprises a plurality of first exhausting units (6) positioned in the proximity of at least two corners of the operating room, and a second exhausting unit (7) positioned with its center point (7c) at least 2 meters above a floor level and within 3 meters from a center point (8c) of an upper frame of the door (8). The second exhausting unit (7) is configured to exhaust more air per time unit than any one of the first exhausting units (6) individually.

Description

Ventilation system for operating roomTechnical field The present invention relates to a ventilation system for an operating room.
Background At a hospital, operations are carried out in an operating room, where surgical operations arecarried out in a sterile environment. An operating room (also known as an operating theater,or operating suite) may be a rectangular or square room, which can be divided into four areas: Area 1, Surgical Area: ln this area surgery is carried out and many people per square meter arepresent. The staff is in sterile clothing and there are sterile instruments.
Area 2, Instrument Area: ln this area, sterile instruments are present on designated tables andstaff is coming and going.
Area 3, Anesthetic Area: ln this area, many people per square meter from the anesthetic staffare present. This area has lower hygiene requirements compared to Areas 1 and 2.
Area 4, Other Area: ln this area, staff is coming and going. This may be an area for passagebetween the operating room and the corridor and a working space for staff in non-sterileclothing.
The four areas are illustrated in figure 1. lt has long been known that one of the key factors to prevent surgical site infections is use ofair having a low concentration of viable bacteria. With the increasing occurrence of antibiotic-resistant bacteria that cause surgical site infections, reliance on antibiotic prophylaxis cannotcontinue. Thus, ventilation of the operating room must be as efficient as possible. Today, therisk for infection after a surgery is partly related to the concentration of Colony Forming Unit(CFU) in the air around the surgical Area 1 and the instrument Area 2. CFU/m3 is a measurefor the number of bacteria and other infectants (microbes, viruses, etc.) present in the air.
CFU are introduced to the air partly from staff in the operating room and from air flowing intothe operating room, e.g.when doors are opened to adjoining areas. Such adjoining areas arefor example corridors or other rooms with lower requirement for air quality in terms ofCFU/m3. CFU/m3 in an operating room depends, among others, on the number of people inthe operating room, what clothes they wear, the ventilation system used and quality of aircoming in through door openings.
A ventilation system supplies clean air to the operating room. For example, the ventilationsystem supplies clean air to the operating room from the ceiling of the operating room. Theventilation system also exhausts air from the operating room. The manner in which this isdone affects the efficiency of the ventilation and thus the concentration of viable infectantsin the operating room.
The requirement of clean air is highest around the operative Area 1, where surgery isperformed and around the instrumental Area 2, where the sterile surgical equipment is present. Personnel in the Operating room work primarily in two areas: the surgical Area 1 andthe anesthetic Area 3. Air in the room flows between the four Areas. Air may flow betweenthe Areas non-directionally or unidirectionally. The direction of the flow depends amongothers on the device used for input of air and the device(s) used for exhausting air. ln otherwords, the type of ventilation system used in an operating room highly influences the flow ofair between the different Areas.
Air supply can be designed to be an air-mixing system or an air-displacement system. An aimof a mixing ventilation system is to dilute contaminated air by reducing the CFU/m3.
An aim of a displacement ventilation system is to displace contaminated air by pushing cleanair into the area. ln an operation room, high air flows displacement systems are used to createpiston ventilation, such as Laminar Air Flow ceilings (LAF-ceilings). ln LAF-ceiling, air isdistributed as a unidirectional flow with micro-turbulence. The systems are also known asUnidirectional Flow systems.
LAF-ceiling area is commonly used in operation rooms. ln LAF-ceiling, air is supplied from theceiling over the operating table and exhausted at a high and low location in all four corners ofthe operating room. Exhausting units are configured to exhaust equal amount of air per timeunit in each corner, i.e. 25% of the total amount of exhausted air is exhausted in each corner.This is called symmetric exhaust according to DIN-standard. Usually, 1/4 of the exhaustingunits are positioned in the proximity of the ceiling of the operating room and 3/4 of theexhausting units are positioned in the proximity of the floor of the operating room. The lowerpositioned exhaust units exhaust about 75% of the air and the higher positioned exhaust unitsexhaust about 25% ofthe air. The system provides for a very low CFU presence in the surgicalArea (< 3 CFU/m3) and around the instrumental Area 2. However, the known systems are notable to achieve equal CFU/m3 level throughout the room. The concentration of CFU is alwayshigher in the proximity of staff and/or an open door compared to other Areas in the room.Besides, the flow of air from the LAF-ceiling prevents an accumulation of CFU in the surgicalArea. But, this air flow can be disrupted by movement of the staff present in the room, whichin turn reduces the protective effect of the air supply on the surgical Area.
A mixing ventilation system will not be able to achieve equal CFU levels in the whole room.The concentration of CFU will be higher in proximity of staff or an open door.
There is a need to increase the cleanliness of operating rooms, to reduce CFU/m3, minimizethe spread of CFU and to reduce the risk of infections for the patients, such as surgical siteinfections.
Summary lt is an aim ofthe present invention to at least pa rtly overcome the above-mentioned problem,and to provide an improved ventilation system for an operating room.
An aim of the invention is to increase the efficiency of the ventilation and reduce theconcentration of viable bacteria in the operating room.
This aim is achieved by the system as defined in claim 1. .fimcrdlng t .n ewh., širr* n* f” e dlxk, “r , tïhe system comprises a ventilation systemfor an operating room. The operating room comprising a surgical Area where the patient andsurgical personnel are positioned during surgery, an anesthetics Area where the anestheticspersonnel are positioned during surgery, and a door to an outside ofthe operating room. Theventilation system comprises a plurality of first exhausting units positioned in the proximity ofat least two corners of the operating room, and a second exhausting unit positioned with itscenter point at least 2 meters above floor level and within 3 meters from a center point of anupper frame of the door. The second exhausting unit is configured to exhaust more air per time unit than any one of the first exhausting units individually.
An asymmetric air outlet construction is provided to reduce the risk of spreading air with lowquality (i.e. > 3 CFU/m3) to the surgical Area and instrument Area, e.g. from the anesthesiaArea or when a door is opened. An air outlet, i.e. the second exhausting unit, with adominating part ofthe total air exhaust is positioned in closeness ofthe door. With dominatingpart is meant that the second exhausting unit exhaust more air per time unit than each of theother exhausting units, i.e. the first exhausting units, individually.
For a mixing ventilation system with a high airflow, an air outlet construction with a highdegree of asymmetry will create a mass effect that will affect directions of air movements inthe whole room. This will reduce CFU/m3 in Area 1.
The system provides a high ventilation efficiency by positioning a domination part of the airexhaust in an area with a higher concentration of CFU in the air (e.g. 5 or more CFU/m3).
According to some aspects, the second exhausting unit is configured to exhaust more or equalto 25% of the total room air exhaust per time unit. The amount of exhaust of air from thesecond exhausting unit depends on the number of first exhausting units and also on thenumber of times the door opens to the outside of the operating room and the number ofpeople in the room. According to some aspects, the opening of the door automaticallyincreases the exhaust rate of the second exhausting unit. According to some aspects, thesecond exhausting unit is configured to exhaust more or equal to 33% of the total room airexhaust per time unit.
According to some aspects, the second exhausting unit is positioned in or on the ceiling of theoperating room. The location of the second exhausting unit will depend on the set up of theoperating room and the space available for positioning a second exhausting unit. Preferably,the second exhausting unit is positioned in or on the ceiling. lt may be that the layout of theoperating room is such that there is no room forthe second exhausting unit in or on the ceiling,in which case the second unit can be positioned in or on a wall.
According to some aspects, the second exhausting unit comprises more than one exhaustingunit. lt may be more efficient, and/or more cost effective to arrange more than one secondexhausting units next to each other.
According to some aspects, the second exhausting unit is positioned with its center pointwithin 2 meters from a center point of an upperframe ofthe door. Depending on the size andlayout of the room, the distance between the center point of the second exhausting unit andthe center point of the upper frame of the door can be adapted. ln a small operating room,the distance may for example be one meter or even shorter than one meter.
Brief description of the drawings The invention will now be explained more closely by the description of different embodimentsof the invention and with reference to the appended figures.
Fig. 1 shows a top view of an example set up of an operating room with the four Areas.Fig. 2 shows a side view of an example set up of an operating room.
Fig. 3 shows a diagram indicating the air quality requirements versus CFU load in the differentAreas of the operating room.
Fig. 4 shows an top view of an operating room with the exhausting units and indicating amaximum distance between the centre ofthe door and the centre point ofthe second exhaustunit. The bottom part shows a side view of a cut out at line X of the middle part of the room.
Fig. 5a, 5b, 5c shows a top view of the same room as figure 1 indicating the air qualityrequirements versus CFU load in the different Areas of the operating room. The bottom partsshow a side view ofthe same rooms. .
Detailed description Aspects of the present disclosure will be described more fully hereinafter with reference tothe accompanying drawings. The system disclosed herein can, however, be realized in manydifferent forms and should not be construed as being limited to the aspects set forth herein.Like numbers in the drawings refer to like elements throughout.
The terminology used herein is for the purpose of describing particular aspects of thedisclosure only and is not intended to limit the invention. As used herein, the singular forms”a”, ”an” and ”the” are intended to include the plural forms as well, unless the context clearlyindicates otherwise. Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
Figures 1 and 2 shows an operating room. The room may be square or rectangular with atleast one door positioned in at least one wall, The room can be divided into four Areas: Area 1, Surgical Area: ln this area surgery is performed and many people per square meter arepresent. The staff S1 is in sterile clothing and there are sterile instruments.
Area 2, Instrument Area: ln this area there are sterile instruments 10 on designated tables,separate to the surgical area.
Area 3, Anesthetic Area: Anesthesia staff S3 working area. Also, in this area, there are manypeople per square meter. This area has lower hygiene requirements compared to Area 1 and2 because it is not so closely associated with the surgical site of the patient.
Area 4, Other Area: ln this are there is staff S4 coming and going and no instruments arepresent. This is an area for passage between the operating room and the corridor. This is alsoa working space for staff in non-sterile clothing.
Figure 3 shows a diagram indicating the air quality requirements versus CFU load in thedifferent Areas of the operating room. ln Area 4, the Other Area, there are few people andthe air quality requirements are low since the patient 5 is not near this area. ln Area 3, theAnaesthesia Area 3, there are more people per m2 than in Area 4 but the air qualityrequirements are about the same. ln Area 2, the Instrument Area, the air quality requirementsare high but the CFU load is normally low enough not to cause a problem for the required airquality. The low CFU load is mainly due to a reduced number of people per m2 in the Area. lnArea 1, the Surgical Area, the air quality requirements are high while the CFU load is increasedcompared to Area 4. One reason is the presence of many people per m2 in this Area 1. ThisArea puts high demand on the ventilation system in the room.
The ventilation system comprises a plurality of first exhausting units 6 positioned in theproximity of at least two corners of the operating room and a second exhausting unit 7. Thesecond unit has a center point 7c and is positioned at least 2 meters above floor level. Thesecond exhausting unit is positioned within 3 meters from a center point 8c of an upper frameof the door 8. The second exhausting unit 7 is configured to exhaust more air per time unitthan any one of the first exhausting units 6 individually. Thus, the second exhausting unit 7may be an air outlet with the dominating air exhaust, positioned in or on the ceiling or in oron a wall, g 2 meter from the floor and with its center point 5 3 m from the center ofthe upperframe of the door. Depending on the size and layout of the room, the distance between thecenter point 7c ofthe second exhausting unit 7 and the center point 8c ofthe upper frame ofthe door 8 can be adapted. ln a small operating room, the distance may be for example 1.5meters, 1 meter or even less than 1 meter.
The second exhausting unit is, for example, positioned in or on the ceiling of the operatingroom. The location ofthe second exhausting unit 7 will depend on the set up of the operatingroom and the place available for positioning the second exhausting unit. Preferably, thesecond exhausting unit is positioned in or on the ceiling, but it may be that the layout of theoperating room is such that there is no room for the second exhausting unit in or on the ceilingand it is then positioned in or on a wall. The limitations of it being positioned with its centerpoint at least 2 meters above floor level and within 3 meters from a center point of an upperframe of the door also applies when the second exhausting unit is positioned in or on theceiling.
To improve efficiency, and/or cost effectiveness, more than one second exhausting units maybe used. These second units may be positioned in proximity or next to or attached to each other. According to some aspects, the second exhausting unit comprises more than oneexhausting unit.
Figure 4 illustrates an operating room from above. The bottom part of the figure illustrates acut through at line X of the top part so that the same room can be seen from a side view. lnthe bottom part is illustrated that the clean air is added to the room by the ventilation system.This clean air can be added from the ceiling above the operating table in Surgical Area 1. lnother words, the operating room has at least one air supply unit 9, which supplies clean air tothe operating room. According to some aspects, the at least one air supply unit 9 is positionedin or on the ceiling of the operating room in Area 1. ln another aspect, the at least one airsupply unit is positioned in or on the ceiling ofthe operating room directly above the operationtable. ln figure 1, 2 and 4 is shown that first exhausting units 6 of the ventilation system arearranged/ disposed, located, placed/positioned in the proximity of the four corners. ln thebottom part of figure 4, the first exhausting units are present in the proximity of the ceilingand in the proximity of the floor. A second exhausting unit is positioned in the proximity ofthe door 8, which closes an opening between the operating room and the outside of theoperating room, for example a corridor. The second exhausting unit 7 is configured to exhaustmore amount of air per time unit than the first exhausting units individually. Preferably, thesecond exhausting unit 7 is positioned in the proximity of, or in, or on, the ceiling of theoperating room, preferably in the ceiling.
An asymmetric air outlet construction 7 is used to reduce the risk of spreading air with lowquality (> 4 CFU/m3) to the Surgical Area 1 and Instrument Area 2. An air outlet, i.e., the secondexhausting unit 7, with a dominating part of the total air exhaust, is positioned in closeness ofthe door 8. The second exhausting unit is preferably positioned in association with AnesthesiaArea 3, such that air from this Area 3 does not flow to Area 1 or 2. lf the door is located asshown in figure 1 and 4, i.e. in the same side ofthe operating room as the Anesthesia Area 3,the second exhausting unit can be positioned with its center point 7c between the door 8 andthe Anesthesia Area 3. The second exhausting unit is for example positioned in the ceiling orin a wall near the ceiling, with its center point positioned between the Anesthesia Area 3 andthe door 8. With dominating part is meant that the second exhausting unit 7 exhausts moreair per time unit than each ofthe first exhausting units 6, individually. lf a second exhaust system is used in combination with mixing ventilation will affect the airmovements in the whole room and thus improve air quality in the surgical area (Area 1.) The system provides a high ventilation efficiency by positioning a dominating part of the airexhaust in an area with a high concentration of CFU (>3.5/m3) in the air.
As previously mentioned and according to some aspects, the second exhausting unit isconfigured to exhaust more or equal to 25%, or between 24 and 50%, of the total room airexhaust per time unit. The amount of exhaust of air per time unit from the second exhaustingunit relative to the total amount of exhaust from the first and second units together, depends, for example, on the number of first exhausting units, on the number of times that the dooropens, the number of staff S in the room and the like. According to some aspects, the openingofthe door automatically increases the exhaust rate ofthe second exhausting unit. Accordingto other aspects, the exhaust of the first and/or second exhausting units is increased, whenthe CFU level raises above a predetermined value. ln other words, opening of the door mayautomatically trigger the exhaust rate of the first and/or second exhaust unit to increase for apredetermined amount of time. For example, the exhaust rate of the second exhausting unitis 25% of the total air exhaust from the room per time unit and when the door in opened, theexhaust rate is increased to 33% for a specified amount of time. The specified predeterminedamount of time is for example any time between 15 seconds to 3 minutes. For example, 1minute or 2 minutes. According to some aspects, the second exhausting unit is configured toexhaust more or equal to 33%, or between 25 and 40%, ofthe total room air exhaust per timeunit.
For example, the second exhausting unit may be arranged to exhaust about 32% of the totalamount of exhausted air, and the first exhausting units may be arranged to exhaust about 17%of the total amount of exhausted air in each of the four corners. This is a so called asymmetricexhaust air. Asymmetric air flow improves air flow in the room, especially the flow of airaround objects and persons in the room, thereby reducing the risk for accumulation ofbacteria and the like around such objects.
An example ventilation system will now be described with an example. An operating room setup approximately according to figure 1 has 8 first exhausting units 6; two in each corner. Onetop first exhausting unit is positioned high in the wall, in the proximity of the ceiling, and onebottom first exhausting unit is positioned low in the wall, in the proximity of the floor. ln eachcorner, the first exhausting units evacuate about 17% of the total amount of air evacuatedfrom the room per time unit so that the total amount of air evacuated per time unit by all ofthe first exhausting units is about 68%. ln each corner, the top first exhausting unit exhaustsabout 33% of the 17% and the bottom first exhausting unit exhausts about 67% of the 17%.The second exhausting unit 7 is positioned in the ceiling with its center point 7c within 3meters from a center point 8c of an upper frame of the door 8. ln this example, it is positionedwith its center point 2 meters from the center point of the upper frame ofthe door. The ceilingof the example operating room is 2.7 meters high, therefore, the second exhausting unit ispositioned 2.7 meters above the floor.
Figure 5 illustrates the effect of the ventilation system ofthe invention. The upper part of thefigure illustrates an operating room from above. The bottom part of the figure illustrates aside view of the same room. On the left, figures 5a illustrates the effect obtained with a DIN-standard ventilation system as used today. lt is obvious from figure 5a that the amount ofCFU/m3 is highest in Areas 1 and 3 and less in Areas 2 and 4. Figure 5b illustrates that theCFU/m3 is reduced in all Areas 1 to 4 using the ventilation system of the invention. Figure 5cillustrates the effect of a system, wherein the second exhausting unit 7 is positioned low behind Area 3. lt is obvious from figure 5c that the CFU/m3 is higher compared to figure 5b,where the second exhausting unit 7 is position high up in the ceiling.
Reference list 1. Area 1 7. Second exhausting unit 2. Area 2 7c. Center point of second exhausting unit3. Area 3 8. Door 4. Area 4 8c. Center point of door 5. Patient 9. Air supply unit 6. First exhausting unit 10. Instruments S. Staff/personnel/people, S1 surgical staff,S3 anesthetic staff, S4 other staff

Claims (1)

1. m A ventilation system for an Operating room, the Operating room comprising a surgicalArea (1), where the patient and surgical personnel (S1) are positioned during surgery,an anesthetics Area (3), where the anesthetics personnel (S3) are positioned duringsurgery, and a door (8) to an outside of the operating room, wherein the ventilationsystem comprises a p|ura|ity of first exhausting units (6) positioned in the proximity ofat least two corners of the operating room, and a second exhausting unit (7) positionedwith its center point (7c) at least 2 meters above a floor level and within 3 meters froma center point (8c) of an upper frame of the door (8), wherein the second exhaustingunit (7) is configured to exhaust more air per time unit than any one of the firstexhausting units (6) individually. The ventilation system according to claim 1, wherein the second exhausting unit (7) isconfigured to exhaust more or equal to 25% of the total room air exhaust per timeunit. The ventilation system according to claim 1 or 2, wherein the second exhausting unit(7) is configured to exhaust more or equal to 33% of the total room air exhaust pertime unit. The ventilation system according to claim 3, wherein, in each corner, the firstexhausting units (6) evacuate about 17% of the total amount of air evacuated from theroom per time unit so that the total amount of air evacuated per time unit by all of thefirst exhausting units (6) is about 68%. The ventilation system according to any preceding claim, wherein the secondexhausting unit (7) is positioned in or on a ceiling of the operating room. The ventilation system according to any preceding claim, wherein the secondexhausting unit (7) comprises more than one exhausting unit. The ventilation system according to any preceding claim, wherein the secondexhausting unit (7) is positioned with its center point (7c) within 2 meters from thecenter point (8c) ofthe upper frame of the door (8). The ventilation system according to any preceding claim, which further comprises atleast one air supply unit (9), which supplies clean air to the operating room.
SE1851211A 2018-10-05 2018-10-05 Ventilation system for operating room SE542510C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE1851211A SE542510C2 (en) 2018-10-05 2018-10-05 Ventilation system for operating room
EP19789878.6A EP3860544A1 (en) 2018-10-05 2019-10-04 Ventilation system for operating room
PCT/EP2019/076908 WO2020070285A1 (en) 2018-10-05 2019-10-04 Ventilation system for operating room

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1851211A SE542510C2 (en) 2018-10-05 2018-10-05 Ventilation system for operating room

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Publication Number Publication Date
SE1851211A1 SE1851211A1 (en) 2020-04-06
SE542510C2 true SE542510C2 (en) 2020-05-26

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SE (1) SE542510C2 (en)
WO (1) WO2020070285A1 (en)

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