US3834872A - Tabletop steam sterilizer - Google Patents
Tabletop steam sterilizer Download PDFInfo
- Publication number
- US3834872A US3834872A US00268747A US26874772A US3834872A US 3834872 A US3834872 A US 3834872A US 00268747 A US00268747 A US 00268747A US 26874772 A US26874772 A US 26874772A US 3834872 A US3834872 A US 3834872A
- Authority
- US
- United States
- Prior art keywords
- water
- chamber
- steam
- container
- reservoir
- 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
Links
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Classifications
-
- 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
- A61L2/24—Apparatus using programmed or automatic operation
-
- 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
Definitions
- the container is a plunger chamber wherein a solenoid operated plunger is used to inject water into the sterilizing chamber.
- a solenoid operated plunger is used to inject water into the sterilizing chamber.
- steam exhausts through the plunger chamber into a water reservoir.
- the pressure of steam in the plunger chamber forces the plunger back in a return stroke and heats the chamber.
- Subsequent cooling of the plunger chamber creates a partial vacuum which draws water back into the plunger chamber from the reservoir to fill the chamber for the next cycle of operation.
- steam is exhausted through an ejector having its outlet in the container and its suction leg in a water reservoir, so that water is pulled from the reservoir to condense the steam. This fills the container to overflowing so that the container is filled for the next cycle, the overflow being directed to the reservoir.
- the present invention relates to tabletop steam sterilizers and more particularly to such a sterilizer having automatic refill capabilities, wherein a measured amount of water is introduced into the sterilizer for each cycle of operation.
- Tabletop steam sterilizers are usually self-contained, i.e. they have a water reservoir to eliminate the need for external plumbing connections. Introduction of water into the sterilizing chamber is accomplished simply by manually opening a valve to permit water to drain by gravity from the reservoir and into the chamber. The valve is manually turned off when the operator observes the desired level of water in the chamber. The sterilizing cycle is then started by turning on a heater in the sterilizing chamber to convert the water to steam. At the end of the sterilizing cycle, steam is vented through a condenser coil in the reservoir to permit recycling of the water.
- the cycle of operation is made completely automatic by providing means for introducing preselected amounts of water into the sterilizing chamber at the start of each cycle, the means being refilled automatically from the reservoir at the end of each cycle.
- One embodiment of the present invention may be characterized by a measuring cylinder in the plumbing between the reservoir and sterilizing chamber and a solenoid operated plunger in the cylinder.
- a measuring cylinder in the plumbing between the reservoir and sterilizing chamber and a solenoid operated plunger in the cylinder.
- the solenoid activates the solenoid.
- This causes the plunger to inject the water in the cylinder through valve means and into the sterilizing chamber, where a heater converts the water to steam.
- any suitable temperature and/or pressure sensor operates the valve means so as to exhaust the steam into the reservoir, at least part of the steam first passing through the measuring cylinder.
- the steam in the measuring cylinder forces the plunger back in a return stroke and heats the cylinder. Subsequent cooling of the cylinder creates a partial vacuum to draw water from the reservoir back into the cylinder for the next cycle of operation.
- Another embodiment of the invention is characterized by having a water container of known volume arranged for gravity flow to the sterilizing chamber; means for completely emptying the contents of the container into the sterilizing chamber at the start of each cycle; a water reservoir; and means drawing water from the reservoir to mix with and condense steam vented from the sterilizing chamber at the end of the cycle. Water drawn from the reservoir and condensed steam are discharged directly into the container filling the container to overflowing thereby providing a measured amount of water in the container for the next cycle of operation, the overflow being directed back to the reservoir.
- FIG. 1 is a schematic representation of the sterilizer of the present invention.
- FIG. 2 is a view similar to FIG. 1, showing another embodiment of the invention.
- FIG. 1 shows the tabletop sterilizer of the present invention generally indicated at 10.
- the sterilizer includes a sterilizing chamber 12 having a load/unload opening which may be closed by any suitable door member 14. Within the sterilizing chamber is an electric heating element 16. There may be various shelves or holding means (not shown) within the sterilizing chamber for receiving the articles to be steam sterilized.
- the sterilizer chamber is highly insulated, a portion of which is shown at 18, so that as much heat as possible is retained by the sterilizing chamber.
- Sterilizer 10 also includes a water reservoir 20 which communicates through a pipe 22 with a cylinder 24.
- One end of pipe 22 forms a condenser coil 26 within the reservoir.
- the pipe itself contains a venting orifice 28 for purposes set out hereinbelow.
- Connecting cylinder 24 to the bottom of sterilizing chamber 12 is a pipe 30 which has two branch passages 30A and B, the flow through these branch passages being controlled by a solenoid valve 32 and check valves 34A and 34B.
- Pipe 30 communicates with the bottom of sterilizing chamber 12 through a sump 36.
- a plunger 38 In cylinder 24 is a plunger 38.
- the plunger is operated by a solenoid 40 outside of the cylinder.
- the plunger For purposes of adjusting the stroke of the plunger, the plunger has a threaded stem 42 and an adjustable stop 44.
- the controls for the sterilizer include a start button and switch 46, and a sterilizing chamber pressure/temperature sensor and switch 48.
- the start button and switch 46 controls the operation of solenoid 40 and heater 16 through primary circuit portions 50 and 52 respectively.
- Temperature sensor switch 48 controls the operation of valve solenoid 32 through a secondary circuit portion 54.
- reservoir 20 simply requires that reservoir 20 be kept filled. This can be done periodically, say on a day to day basis, or perhaps at less frequent intervals.
- Chamber 24 is filled, say by manually moving the plunger to the position shown in FIG. 1 or by putting water directly into the sterilizing chamber 12 and running a dummy load. Thereafter plunger chamber 24 will be automatically refilled at the end of each sterilizing cycle, as set out hereinbelow. Assuming the plunger chamber is initially filled with Water, the operation will be described as beginning when articles to be sterilized are placed in sterilizing chamber 12 and door member 14 sealed.
- push button switch 46 is closed. This energizes solenoid valve 32 to move the valve to the position shown in dotted line. Plunger solenoid 4.0 is also activated, which causes the piston 38 to move to the left, as viewed in FIG. 1. In this manner, the contents of cylinder 24 are injected through pipe 30, check valve 34A, branch pipe 30A and sump 36 into the sterilizing chamber. It should be appreciated that closing push button switch 46 also energizes the heating element 16. As the water in the sterilizing chamber is turned to steam, air in the chamber is displaced upwardly and is vented through a bleed orifice and air trap valve 56 at the top of the sterilizing chamber. As the steam pressure is built up in sterilizing chamber 12, steam is prevented from venting through pipe 30 on the one hand by check valve 34A and on the other hand by the position as shown in dotted line of solenoid valve 32.
- the length of the sterilizing cycle in the present invention is determined by the saturated steam temperature within sterilizing chamber 12. However, it should be appreciated that any suitable time or pressure cycle may be used.
- temperature switch 48 is actuated. This opens circuit portion 54 to deenergize solenoid valve 32, allowing the valve to return to the position shown in solid lines in FIG. 1. This allows the steam to vent through sump 36, piping 30, check valve 34B, cylinder 24, bled orifice 28, piping 22 and through condenser 26 back into the reservoir.
- a reduction in pressure together with the retained heat in the sterilizer should cause the vaporization of any condensed moisture in the sterilizer.
- temperature sensor 48 also opens circuit portion 50 to deenergize solenoid 42. With the solenoid deenergized, the steam entering cylinder 24 pushes piston 38 to the right, as viewed in FIG. 1, in a return stroke. The passage of stream through piping 22 is restricted by bleed orifice 28 so that there will be an accumulation of saturated steam in cylinder 24.. The steam accumulating in the cylinder not only moves the piston in a return stroke, but also heats the cylinder.
- cylinder 24 When all of the steam has been exhausted into the reservoir, cylinder 24 will cool, creating a slight vacuum which will draw water back into the cylinder through piping 22 and bleed orifice 28. Since cylinder 24 had contained saturated steam, the condensing of this steam together with the water being drawn into the cylinder by vacuum should completely fill the cylinder with water. In this manner, the cylinder is automatically refilled in preparation for the next cycle of operation.
- any suitable means such as a fan 58 can be provided for this purpose.
- the operation of the fan can be controlled by any suitable means (not shown), such as temperature sensor responsive to the reservoir temperature, or the fan may be connected to circuit portion 50, so that it runs continuously during the sterilizing cycle.
- the venting can be done manually as in an abort situation simply by providing means for opening the push button switch 46.
- an abort situation it is anticipated that the abort would occur before all of the injected water has turned to steam. In this case, the water accumulating on the bottom of the sterilizing chamber 12 and in sump 36 would be forced out by pressure in the sterilizing chamber.
- the sterilizer shown includes a measuring container 60 having a known volume.
- jacent container 60 is a water reservoir and overflow tank 64, the container and tank being separated by a wall or weir member 66. It should be appreciated that the container and tank need not be incorporated into a single vessel as shown, and that if the container and tank are spaced apart, other means may be provided to conduct the overflow from the container to the reservoir/ overflow tank.
- Container 60 is located above the sump 68 of a sterilizing chamber, a portion of the sterilizing chamber being shown at 62.
- a pipe 70 connects the container to the sump for this purpose.
- a second pipe 72 is connected to and communicates with pipe 70 and the inlet of an ejector 74.
- Ejector 74 has its suction leg 76 extending down into reservoir/ overflow tank 64.
- the outlet 78 of the ejector is arranged to discharge into container 60.
- Completing the components of the embodiment shown in FIG. 2 is a three-way solenoid valve 80 controlling the flow through pipes 70 and 72, and a check valve 82 located in pipe 70 for purposes set out hereinbelow.
- FIG. 2 The construction and operation of the embodiment shown in FIG. 2 is simpler than the embodiment shown in FIG. 1, in that the plunger has been eliminated and gravity alone delivers water from the container into the sterilizing chamber.
- container 60 initially must be filled to overflowing. Since the entire contents of container 60 are drained into the sterilizing chamber at the start of each cycle, filling the container to overflowing ensures that the same amount of water is introduced into the sterilizer for each cycle.
- the overflow into reservoir/ overflow tank 64 should be suflicient to cover the inlet of suction 76 and, preferably, should substantially fill this tank.
- any suitable means such as a push button (not shown) may be operated to initiate the cycle.
- solenoid valve 84 When the cycle is started, solenoid valve 84) is moved from the position shown in solid line in FIG. 2 to the position shown in dotted line. This permits all of the water in container 60 to drain through pipe 70 into the sump and sterilizing chamber. A heater in the chamber then converts the water to steam. As pressure builds up in the sterilizing chamber, any flow back through pipe 70 into the container is prevented by check valve 82 and the position of solenoid valve 80.
- solenoid valve 80 is operated and moved to the position shown in solid line in (FIG. 2. With pipe 72 now open, steam is directed from the sterilizing chamber through a portion of pipe 70, pipe 72 and through ejector 74. The passage of steam through the ejector draws water from reservoir/overflow tank 64 through suction 76. The water is mixed with and acts to condense the steam, so that only water is discharged through outlet 78 into container 60.
- container 60 is automatically refilled to provide a measured amount of water for the next sterilizing cycle.
- Tabletop steam sterilizers are usually designed so that the same amount of water will be used in each sterilizing cycle. Accordingly, reservoir 60 can be designed to hold the optimum amount of water and there should be no need to provide means for varying the volume of the measuring container 60. However, it is within the skill of the art to provide the container with an adjustable volume, say by having means to increase or decrease the height of wall 66, or by putting blocks in the container to reduce its volume.
- the present invention provides a tabletop steam sterilizer having means for automatically refilling the sterilizing chamber with a measured amount of water at the beginning of each sterilizing cycle. While preferred embodiments of the invention have been described, it should be appreciated that various modifications are within the skill of the art. For example, all of the separate components shown in FIGS. 1 and 2 are preferably incorporated into a single cabinet or housing (not shown).
- the piping 22 and bleed orifice 28, as shown in FIG. 1, do not have to communicate directly with the cylinder 24. Instead, pipe 22 and bleed orifice 28 may be connected directly to pipe 30, between the cylinder and solenoid valve 32. With this arrangement, only a portion of the steam venting from sterilizing chamber 12 would be introduced into cylinder 24 to move the plunger in a return stroke and heating the cylinder.
- a tabletop steam sterilizer including a sterilizing chamber adapted to receive goods to be sterilized by steam and pressure, heater means for converting water in the sterilizing chamber to steam, a water reservoir separate from the chamber and piping communicating with and extending between the reservoir and sterilizing chamber, the improvement comprising means for injecting a measured amount of water into the chamber, comprising:
- valve means in the portion of piping between said plunger chamber and sterilizing chamber;
- control means operating said piston drive means and said valve means at the start of a sterilizing cycle to permit the injection of water in said plunger chamber into said sterilizing chamber, said control means thereafter, at the end of the sterilizing cycle, operating said valve means to permit at least a portion of the steam in said sterilizing chamber to vent into said plunger for driving said piston in a return stroke;
- a tabletop steam sterilizer having a sterilizing chamber adapted to receive goods to be steam sterilized, a water reservoir, and heater means to convert Water in the sterilizing chamber to steam, the improvement comprising fill means to deliver automatically a measured quantity of water from the reservoir to the sterilizing chamber comprising:
- (d) means driving said plunger in a pumping stroke for injecting substantially all of the water in said pump chamber into said sterilizing chamber;
- means including a valved conduit extending between and communicating with said pump and sterilizing chambers and conduit means in fluid flow communication with said pump chamber and reservoir for venting said sterilizing chamber through said pump chamber and into said reservoir, the pressure of steam venting from said sterilizing chamber and into said reservoir through said pump chamber causing said plunger to move in a return stroke;
- refill means conducting water from said reservoir to said pump chamber at the end of the sterilizing cycle for substantially completely filling said pump chamber.
Landscapes
- 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)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
Description
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00268747A US3834872A (en) | 1972-07-03 | 1972-07-03 | Tabletop steam sterilizer |
AU56083/73A AU468902B2 (en) | 1972-07-03 | 1973-05-24 | Tabletop steam sterilizer |
CA175,221A CA980975A (en) | 1972-07-03 | 1973-06-29 | Table top steam sterilizer |
JP48074465A JPS4943485A (en) | 1972-07-03 | 1973-07-03 | |
DE19732333755 DE2333755A1 (en) | 1972-07-03 | 1973-07-03 | DESKTOP STERILIZER |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00268747A US3834872A (en) | 1972-07-03 | 1972-07-03 | Tabletop steam sterilizer |
Publications (1)
Publication Number | Publication Date |
---|---|
US3834872A true US3834872A (en) | 1974-09-10 |
Family
ID=23024291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00268747A Expired - Lifetime US3834872A (en) | 1972-07-03 | 1972-07-03 | Tabletop steam sterilizer |
Country Status (5)
Country | Link |
---|---|
US (1) | US3834872A (en) |
JP (1) | JPS4943485A (en) |
AU (1) | AU468902B2 (en) |
CA (1) | CA980975A (en) |
DE (1) | DE2333755A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4166096A (en) * | 1978-03-23 | 1979-08-28 | American Sterilizer Company | Biohazard steam sterilizer |
US4259293A (en) * | 1979-11-28 | 1981-03-31 | American Dental Association Health Foundation | Fluorochemical vapor autoclave |
US4891188A (en) * | 1987-05-21 | 1990-01-02 | Mdt Corporation | Unplumbed sterilizer |
WO2000059553A1 (en) * | 1999-04-06 | 2000-10-12 | Scican, A Division Of Lux And Zwingenberger Ltd. | Sterilizer with vacuum-assisted air removal |
JP2021112654A (en) * | 2016-07-22 | 2021-08-05 | 株式会社タカゾノ | Steam sterilizer |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE438965B (en) * | 1975-02-13 | 1985-05-28 | Berol Kemi Ab | FURTHER DEVELOPMENT OF THE SET AS CLAIM 1 OF THE PATENT 7415977-3 FOR DIVISION OF MINERAL WOOLS IN FIBERS AND SOCKS |
JPS52118005A (en) * | 1976-03-31 | 1977-10-04 | Fukubi Kagaku Kogyo Kk | Process for making backing sheets for laminated products |
JPS536601A (en) * | 1976-07-09 | 1978-01-21 | Asahi Ishiwata Kogyo Kk | Asbestos beater sheets |
JPS547464A (en) * | 1977-06-17 | 1979-01-20 | Kuraray Co Ltd | Production of inorganic fiber sheet |
JPS5459795U (en) * | 1977-10-03 | 1979-04-25 | ||
DE3025982C2 (en) * | 1980-07-09 | 1986-10-09 | Aesculap-Werke Ag Vormals Jetter & Scheerer, 7200 Tuttlingen | Sterilization autoclave |
JPS5761686A (en) * | 1980-09-27 | 1982-04-14 | Oriental Asbest | Flexible heat-insulating material |
JPS5721699U (en) * | 1981-03-23 | 1982-02-04 | ||
JPS6054912B2 (en) * | 1981-12-03 | 1985-12-02 | 洋 小泉 | Inorganic sheet for electrical insulation |
DE3617446C1 (en) * | 1986-05-23 | 1987-07-23 | Aesculap Werke Ag | Steam steriliser |
CA2029682C (en) * | 1989-11-24 | 1995-10-10 | Duncan Newman | Method and apparatus for steam sterilization of articles |
JP6461572B2 (en) * | 2014-11-25 | 2019-01-30 | 株式会社タカゾノテクノロジー | Steam sterilizer |
JP6461571B2 (en) * | 2014-11-25 | 2019-01-30 | 株式会社タカゾノテクノロジー | Steam sterilizer |
-
1972
- 1972-07-03 US US00268747A patent/US3834872A/en not_active Expired - Lifetime
-
1973
- 1973-05-24 AU AU56083/73A patent/AU468902B2/en not_active Expired
- 1973-06-29 CA CA175,221A patent/CA980975A/en not_active Expired
- 1973-07-03 DE DE19732333755 patent/DE2333755A1/en active Pending
- 1973-07-03 JP JP48074465A patent/JPS4943485A/ja active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4166096A (en) * | 1978-03-23 | 1979-08-28 | American Sterilizer Company | Biohazard steam sterilizer |
US4259293A (en) * | 1979-11-28 | 1981-03-31 | American Dental Association Health Foundation | Fluorochemical vapor autoclave |
US4891188A (en) * | 1987-05-21 | 1990-01-02 | Mdt Corporation | Unplumbed sterilizer |
WO2000059553A1 (en) * | 1999-04-06 | 2000-10-12 | Scican, A Division Of Lux And Zwingenberger Ltd. | Sterilizer with vacuum-assisted air removal |
US7641852B1 (en) | 1999-04-06 | 2010-01-05 | Scican Ltd. | Sterilizer with vacuum-assisted air removal |
US8795603B2 (en) | 1999-04-06 | 2014-08-05 | Scican, A Division Of Lux And Zwingenberger Ltd. | Cassette for vacuum and steam sterilization apparatus |
JP2021112654A (en) * | 2016-07-22 | 2021-08-05 | 株式会社タカゾノ | Steam sterilizer |
Also Published As
Publication number | Publication date |
---|---|
CA980975A (en) | 1976-01-06 |
JPS4943485A (en) | 1974-04-24 |
AU468902B2 (en) | 1976-01-29 |
DE2333755A1 (en) | 1974-01-24 |
AU5608373A (en) | 1974-11-28 |
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Legal Events
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AS | Assignment |
Owner name: SC ACQUISITION CORP., NO. 1, A NEVADA CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004607/0079 Effective date: 19860711 Owner name: SC ACQUISITION CORP., NO. 1, A NEVADA CORP., STATE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004607/0079 Effective date: 19860711 |
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Owner name: CASTLE COMPANY Free format text: CHANGE OF NAME;ASSIGNOR:SC ACQUISITION CORP. NO. 1;REEL/FRAME:004741/0707 Effective date: 19860725 |
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Owner name: MDT CORPORATION, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CASTLE COMPANY;REEL/FRAME:005036/0117 Effective date: 19890221 Owner name: SANTA BARBARA RESEARCH CENTER, GOLETA, CA., A CA C Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CASTLE COMPANY;REEL/FRAME:005036/0117 Effective date: 19890221 |
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