US3409389A - Method of removing air from goods in preparation for autoclave sterilization - Google Patents

Method of removing air from goods in preparation for autoclave sterilization Download PDF

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Publication number
US3409389A
US3409389A US396929A US39692964A US3409389A US 3409389 A US3409389 A US 3409389A US 396929 A US396929 A US 396929A US 39692964 A US39692964 A US 39692964A US 3409389 A US3409389 A US 3409389A
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US
United States
Prior art keywords
vacuum
sterilization
pressure
autoclave
space
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.)
Expired - Lifetime
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US396929A
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English (en)
Inventor
Bengt A Bjork
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.)
Getinge Mekaniska Verkstads AB
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Getinge Mekaniska Verkstads AB
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Filing date
Publication date
Priority claimed from SE10875/63A external-priority patent/SE309651B/xx
Application filed by Getinge Mekaniska Verkstads AB filed Critical Getinge Mekaniska Verkstads AB
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Publication of US3409389A publication Critical patent/US3409389A/en
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Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/04—Heat
    • A61L2/06—Hot gas
    • A61L2/07—Steam
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/20—Targets to be treated
    • A61L2202/26—Textiles, e.g. towels, beds, cloths

Definitions

  • partial vacuum which is at a lower vacuum than the first vacuum and below atmospheric pressure
  • a third step in which fluidthereafter is evacuated from the-space to reduce the pressure therein toward the first vacuum
  • a fourth step in which steam is subsequently introduced into the space to increase the pressure therein toward theipartial vacuum whieh is at a lower vacuum than the first vacuum and below atmospheric pressure, and evacuating fiuid from the space, during the first portion of each of the second and fourth steps while steam is being introduced into the space to promote removal of air from the goods -to prepare such goods for subsequent sterilization by steam in thespace.
  • The? object of the.invention isto' provide a simple and F reliable method'to remove air from articles'or material during a pretreatment period to prepare such articles or material for subsequent sterilization 'by'steain,
  • the pretreatment period is started by first connecting the interior of the autoclave to a vacuum pump.
  • a vacuum pump When the pressure in the autoclave has been reduced to a first vacuum, steam is introduced into the autoclave to increase the pressure therein to a partial vacuum which is at a lower vacuum than the first vacuum and below atmospheric pressure.
  • the foregoing treatment is repeated one or more times prior to the main or primary sterilization period.
  • the entire pretreatment of the articles or material is carried out below atmospheric pressure between a first vacuum and a lower partial vacuum which, to an essential extent, has promoted removal 3,409,389 ljatented Nov. 5, 1968 "ice of-.air--from articlesand material to prepare them for subsequent sterilization and has contributed to improved sterilization results under ditficult conditions, such as, for example,- the sterilization of tightly-l compressed articles ormaterial; p
  • connection of the vacuum pump to the autoclave is closed or throttled whereby the steam will function to build up the pressure in the autoclave to the aforementioned finalpartial vacuum, afterwhich the connection to the vacuum pump is completely opened again when the pressure in the autoclave is built up to the aforementioned final partial vacuum which is below atmospheric pressure.
  • FIG. 1 diagrammatically shows .tem-
  • FIG. 2 diagrammatically shows temperature conditions as a function of time when the towels undergoing sterilization have been prepared for such sterilization according to a conventional pretreatment known in the prior art which includes three vacuum periods and between these periods positive pressure periods at 0.9
  • FIG. 3 diagrammatically shows temperature conditions as a function of time when the towels undergoing sterilization have been prepared for such sterilization according to a pretreatment method embodying my invention which includes three 80% vacuum periods and between these periods of vacuum having pressure build-up periods in whichthe pressure in the autoclave increases from a first vacuum to a partial vacuum which is at a lower vacuum than the first vacuum and below atmospheric pressure;
  • FIG. 4 diagrammatically shows temperature conditions as a function of time when the towels undergoing sterilization have been prepared for such sterilization according to a pretreatment method embodying my invention which includes the same pulsations given in the preceding example and further includes connecting the vacuum pump to the autoclave during the first portions of the pressure build-up periods and is disconnected from the autoclave when the pressures in the autoclave during the pressure build-up periods have increased about one-half of the'entire pressure increase in the autoclave from'the first vacuum to the partial vacuum which is lower than the first vacuum and below' atmospheric pressure; and FIG. sh'ows'the temperature conditions in the autoclave measured at the different measuring points when the articles are removed from the autoclave.
  • Each of the figures comprises three curves corresponding, in order from left to right, to a measuring point located in the center of the bundle of goods, a measuring point located between the preceding point and the top of the bundlev and a measuring point located above the bundle. From FIGURE 1 it will be evident that the temperature conditions as' a function of time according to this figure, which are encountered during sterilization, givesrise toconsid erable differences between the temperature in the interior of the bundle and the temperature at its surface. The time period, measured from the time I at which the surface of the bundle of autoclave temperature has reached the sterilization temperature of 138 C., to the time II necessary for the temperature in the interior of the bundle to rise to the sterilization temperature takes about 8 minutes.
  • the sterilization data shows that air has been removed effectively from the towels during the pretreatment period to prepare them for subsequent sterilization by steam in the autoclave.
  • this is due to the fact that during the pretreatment period the connection to the vacuum pump remains open when the first vacuum has been produced in the autoclave and steam is being introduced into the autoclave to build up the pressure therein, and subsequently the vacuum pump connection to the autoclave is closed when the pressure in the autoclave reaches the halfway mark between the first vacuum and the partial vacuum at the end of the pressure build-up period.
  • fluid is evacuated from the space or autoclave during the first part of the pressure build-up in the space after the first vacuum has been produced in the space and while steam is being introduced into the space to increase the pressure therein to a partial vacuum which is lower than the first vacuum and below atmospheric pressure.
  • a very important advantage of the invention consists in being able to remove air effectively from material dur- 4 ing a pretreatment period to prepare such material 'for subsequent sterilization. This reduces the period of time during which the material to be sterilized is subjected to sterilization temperature without any likelihood of the 5 interior of the bundle of material not being sterilized due to the rate at which the temperature in the interior of the bundle of material lags behind the temperature at the surface of the bundle.
  • a method of removing'air from goods in a space during, a pretreatment period to prepare such goods for subsequent sterilization by steam in the space comprising thesteps of (a) initially evacuating fluid from the space to reduce the pressure therein to a first vacuum,

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
US396929A 1963-09-16 1964-09-16 Method of removing air from goods in preparation for autoclave sterilization Expired - Lifetime US3409389A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1013063 1963-09-16
SE10875/63A SE309651B (nl) 1963-10-04 1963-10-04

Publications (1)

Publication Number Publication Date
US3409389A true US3409389A (en) 1968-11-05

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ID=26655753

Family Applications (1)

Application Number Title Priority Date Filing Date
US396929A Expired - Lifetime US3409389A (en) 1963-09-16 1964-09-16 Method of removing air from goods in preparation for autoclave sterilization

Country Status (9)

Country Link
US (1) US3409389A (nl)
BE (1) BE653156A (nl)
CH (1) CH439594A (nl)
DE (1) DE1492347B2 (nl)
DK (1) DK116679B (nl)
ES (1) ES304057A1 (nl)
FI (1) FI40311B (nl)
GB (1) GB1072100A (nl)
NL (1) NL144154B (nl)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795483A (en) * 1969-07-07 1974-03-05 Lever Brothers Ltd Method and device for sterilising of containers
DE2844871A1 (de) * 1977-10-17 1979-04-19 Electrolux Ab Verfahren und anordnung zum sterilisieren von gegenstaenden mit formaldehyd
US4164538A (en) * 1977-11-11 1979-08-14 American Sterilizer Company Load conditioning control method for steam sterilization
US4203947A (en) * 1977-11-11 1980-05-20 American Sterilizer Company Load conditioning control apparatus for steam sterilization
US4203943A (en) * 1977-11-11 1980-05-20 American Sterilizer Company Method of biocidal sterilization using cyclic subatmospheric pressure conditioning
EP0015328A1 (en) * 1979-02-08 1980-09-17 American Sterilizer Company Method and apparatus for steam sterilization
US4239731A (en) * 1979-11-21 1980-12-16 American Sterilizer Company Apparatus for biocidal sterilization using cyclic subatmospheric pressure conditioning
US4241010A (en) * 1979-02-06 1980-12-23 American Sterilizer Company Pressure responsive conditioning control gas sterilization
US4294804A (en) * 1979-02-06 1981-10-13 American Sterilizer Company Pressure responsive conditioning control gas sterilization
US4309381A (en) * 1979-11-06 1982-01-05 American Sterilizer Company Establishing and ascertaining desired air removal in steam sterilization
US4335071A (en) * 1980-10-06 1982-06-15 American Sterilizer Company Pressure-vacuum purge cycle
US4372916A (en) * 1979-11-06 1983-02-08 American Sterilizer Company Establishing and ascertaining desired air removal in steam sterilization
US4395383A (en) * 1980-09-19 1983-07-26 Vernitron Corporation Apparatus for controlling temperature below 212 degrees fahrenheit in a sterilizer chamber
US4447394A (en) * 1977-10-17 1984-05-08 Aktiebolaget Electrolux Method for sterilization with formalin
US4687635A (en) * 1984-10-05 1987-08-18 American Sterilizer Company Porous load vapor sterilization cycle
US5424046A (en) * 1992-02-28 1995-06-13 Smith; Benjamin G. Method and apparatus for steam sterilization
US6354019B1 (en) * 1997-05-23 2002-03-12 Becker Preservotec Gmbh Method for drying paper
US20100278688A1 (en) * 2008-11-24 2010-11-04 Damien Tanaka Containerized Medical Waste Treatment System and Related Method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE190849T1 (de) 1993-11-19 2000-04-15 M O Com S R L Sterilisierungsverfahren und anlage für einen dampfautoklav

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778079A (en) * 1925-11-29 1930-10-14 Fribergs Hogvacuumpump Ab Method of drying wet materials
US2132095A (en) * 1937-01-22 1938-10-04 Broughton Geoffrey Method of conditioning fibrous material
GB542544A (en) * 1940-10-21 1942-01-14 British Thomson Houston Co Ltd Improvements relating to high pressure mercury vapour lamps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778079A (en) * 1925-11-29 1930-10-14 Fribergs Hogvacuumpump Ab Method of drying wet materials
US2132095A (en) * 1937-01-22 1938-10-04 Broughton Geoffrey Method of conditioning fibrous material
GB542544A (en) * 1940-10-21 1942-01-14 British Thomson Houston Co Ltd Improvements relating to high pressure mercury vapour lamps

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795483A (en) * 1969-07-07 1974-03-05 Lever Brothers Ltd Method and device for sterilising of containers
DE2844871A1 (de) * 1977-10-17 1979-04-19 Electrolux Ab Verfahren und anordnung zum sterilisieren von gegenstaenden mit formaldehyd
US4447394A (en) * 1977-10-17 1984-05-08 Aktiebolaget Electrolux Method for sterilization with formalin
US4164538A (en) * 1977-11-11 1979-08-14 American Sterilizer Company Load conditioning control method for steam sterilization
US4203947A (en) * 1977-11-11 1980-05-20 American Sterilizer Company Load conditioning control apparatus for steam sterilization
US4203943A (en) * 1977-11-11 1980-05-20 American Sterilizer Company Method of biocidal sterilization using cyclic subatmospheric pressure conditioning
US4294804A (en) * 1979-02-06 1981-10-13 American Sterilizer Company Pressure responsive conditioning control gas sterilization
US4241010A (en) * 1979-02-06 1980-12-23 American Sterilizer Company Pressure responsive conditioning control gas sterilization
EP0015328A1 (en) * 1979-02-08 1980-09-17 American Sterilizer Company Method and apparatus for steam sterilization
US4309381A (en) * 1979-11-06 1982-01-05 American Sterilizer Company Establishing and ascertaining desired air removal in steam sterilization
US4372916A (en) * 1979-11-06 1983-02-08 American Sterilizer Company Establishing and ascertaining desired air removal in steam sterilization
US4239731A (en) * 1979-11-21 1980-12-16 American Sterilizer Company Apparatus for biocidal sterilization using cyclic subatmospheric pressure conditioning
US4395383A (en) * 1980-09-19 1983-07-26 Vernitron Corporation Apparatus for controlling temperature below 212 degrees fahrenheit in a sterilizer chamber
US4335071A (en) * 1980-10-06 1982-06-15 American Sterilizer Company Pressure-vacuum purge cycle
US4687635A (en) * 1984-10-05 1987-08-18 American Sterilizer Company Porous load vapor sterilization cycle
US5424046A (en) * 1992-02-28 1995-06-13 Smith; Benjamin G. Method and apparatus for steam sterilization
US6354019B1 (en) * 1997-05-23 2002-03-12 Becker Preservotec Gmbh Method for drying paper
US20100278688A1 (en) * 2008-11-24 2010-11-04 Damien Tanaka Containerized Medical Waste Treatment System and Related Method

Also Published As

Publication number Publication date
DE1492347B2 (de) 1978-06-29
BE653156A (nl) 1965-01-18
NL144154B (nl) 1974-12-16
DE1492347A1 (de) 1969-12-11
CH439594A (de) 1967-07-15
NL6410716A (nl) 1965-03-17
ES304057A1 (es) 1965-03-01
DK116679B (da) 1970-02-02
FI40311B (nl) 1968-09-02
GB1072100A (en) 1967-06-14

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