WO1996014883A1 - Procede et appareil de sterilisation de dechets biologiques - Google Patents

Procede et appareil de sterilisation de dechets biologiques Download PDF

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Publication number
WO1996014883A1
WO1996014883A1 PCT/US1994/013123 US9413123W WO9614883A1 WO 1996014883 A1 WO1996014883 A1 WO 1996014883A1 US 9413123 W US9413123 W US 9413123W WO 9614883 A1 WO9614883 A1 WO 9614883A1
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WO
WIPO (PCT)
Prior art keywords
chamber
particles
preheating
sterilization
valve
Prior art date
Application number
PCT/US1994/013123
Other languages
English (en)
Inventor
James A. Buehler
Lynnford William Claypoole
Original Assignee
Sterile Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US07/677,999 priority Critical patent/US5364589A/en
Priority claimed from US07/677,999 external-priority patent/US5364589A/en
Application filed by Sterile Systems, Inc. filed Critical Sterile Systems, Inc.
Priority to PCT/US1994/013123 priority patent/WO1996014883A1/fr
Publication of WO1996014883A1 publication Critical patent/WO1996014883A1/fr

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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
    • A61L11/00—Methods specially adapted for refuse

Definitions

  • This invention relates to a method and apparatus for sterilizing biological waste and, in particular, to a system for sterilizing contaminated medical products and byproducts.
  • Incinerators are usually unsightly and expensive. Moreover, they tend to pollute the environment. Medical waste is a particular problem for incinerators because such waste typically comprises about 30% - 35% plastic. When such material is burned, a variety of hazardous gases are emitted. As a result, incinerators are often subjected to burdensome governmental regulations relating to emissions, safety, zoning, and permitting. Emissions may be severely restricted, for example, to five hundred pounds of waste burned per hour. Alternatively, for handling larger amounts of waste, expensive, scrubbing may be required. All medical waste incinerators must employ afterburners, which greatly increase fuel usage. In short, the expense, inefficiency and regulation of incinerators makes their use impractical in most situations.
  • Sterilizing chemicals present their own set of problems. Ethylene oxide is dangerously explosive and poisonous. Formaldehyde is flammable and toxic. Chemicals also can be difficult to test and transport. And, like incinerators they are typically subjected to close monitoring and extensive government regulation.
  • This invention results from a realization that improved sterilization of biological waste may be accomplished by preheating the waste with steam prior to the final steam sterilization process.
  • This invention results from the further realization that even small amounts of biological waste may be sterilized effectively and efficiently by first chopping or shredding the waste to improve heat transfer, then preheating the chopped waste particles and finally introducing those particles in a gradual, controlled manner into a steam sterilization chamber, where the sterilization process is completed.
  • This invention features a method of sterilizing biological waste material.
  • the waste material is introduced into a shredder mechanism to chop the material into particles of reduced size. Those particles are then transmitted into a preheating chamber and steam is introduced into the chamber to preheat the particles to at least 140 degrees Fahrenheit.
  • a selected amount of the preheated particles are continuously transmitted to a sterilization chamber and steam is introduced into the sterilization chamber to heat the preheated particles to at least 248 degrees Fahrenheit. This heating is conducted for a sufficient duration such that the particles are sterilized.
  • the particles are preheated to at least 140 degrees Fahrenheit, but no greater than 210 degrees Fahrenheit.
  • the preheated particles are preferably heated in the sterilization chamber to no greater than 330 degrees Fahrenheit.
  • the preheated particles may be heated to 248 degrees F for a duration of from 30 minutes to 40 minutes, to 330 degrees Fahrenheit for a duration of 10 minutes to 15 minutes, and to intermediate temperatures for respective durations between 10 minutes and 40 minutes.
  • the method may further include selectively transmitting the heated particles to a compactor and compacting those particles therein.
  • the chopped particles may be conveyed through and dispersed in the preheating chamber as the steam is introduced thereto.
  • the preheated particles may be conveyed through and dispersed in the sterilization chamber as steam is introduced thereto. 5
  • This invention also features an apparatus for sterilizing biological waste material.
  • the apparatus includes a shredder mechanism and means for introducing the waste into the shredder mechanism to chop the waste into particles of reduced size.
  • Second transmittal means are employed for continuously transmitting a selected amount of the preheated particles from the preheating chamber to the sterilization chamber.
  • Means are provided for introducing steam into the sterilization chamber to heat the preheated particles to at least 248 degrees Fahrenheit for a sufficient duration such that the particles are sterilized.
  • a particle compactor is employed and third transmittal means are used for transmitting the sterilized particles to the compactor, wherein the particles are compacted.
  • the means for introducing may include a feed hopper connected to the shredder mechanism.
  • the apparatus may also include purge means that comprise means for introducing steam into the feed hopper to kill bacteria therein after the waste material has been introduced to the shredder mechanism.
  • the first transmittal means may include a storage chamber disposed between the shredder mechanism and the preheating chamber.
  • a first valve may selectively transmit the chopped particles from the shredder mechanism to the storage chamber and a second valve may selectively transmit the chopped particles from the storage chamber to the preheating chamber.
  • the second transmittal means may include a valve assembly for continuously transmitting a selected amount of preheated particles from the preheating chamber to the sterilization chamber.
  • the third transmittal means may include a valve apparatus for selectively transmitting the sterilized particles from the sterilization chamber to the compactor.
  • a jacket is preferably formed about the preheating chamber and means may be provided for introducing steam into the jacket to heat the exterior surface of the preheating chamber.
  • a jacket may be formed about the sterilization chamber and means may be provided for introducing steam into that jacket to heat the exterior surface of the sterilization chamber.
  • a preheating conveyer may be employed to convey the particles through the preheating chamber from the first transmittal means to the second transmittal means.
  • the preheating conveyer may include means for dispersing the particles as the particles are conveyed through the preheating chamber.
  • a sterilization conveyer may be utilized for conveying the preheated particles through the sterilization chamber from the second transmittal means to the third transmittal means.
  • the sterilization conveyer may include means for dispersing the particles as the particles are conveyed through the sterilization chamber.
  • FIG. 1 is a diagram of a method for sterilizing biological waste according to this invention
  • FIG. 2 is an elevational, partly schematic view of an apparatus for sterilizing biological waste according to this invention
  • FIG. 3 is a schematic view of a first star valve for transmitting chopped waste particles from the shredder mechanism to the storage chamber
  • RG. 4 is a schematic view of a second star valve for transmitting chopped particles from the storage chamber to the preheating chamber in a controlled manner
  • RG. 5 is a schematic view of a third star valve for continuously transmitting preheated waste particles from the preheating chamber to the sterilizing chamber;
  • RG. 6 is a schematic view of a fourth star valve for transmitting sterilized waste particles from the sterilizing chamber to the compactor.
  • RG. 7 is a diagram of a controller for automatically operating the apparatus of RG. 2.
  • RG. 1 a method of sterilizing and disposing of biological waste 10.
  • biological waste may comprise bandages, gauze, disposable gloves and garments, syringes and needles, materials of glass and other medical byproducts commonly designated as "red bag waste”.
  • Other types of biological waste may also be successfully processed.
  • the waste is introduced into a shredder or chopper mechanism 12, where it is chopped into fine particles, preferably having a size which is smaller than 2" in any dimension.
  • the chopped particles are then delivered to a preheating chamber 14. Therein, the particles are preheated to a temperature of at least 140 degrees Fahrenheit, and preferably approximately 165 degrees Fahrenheit, by steam 15 that is introduced into the chamber.
  • the particles are preheated and it is believed that pasteurization occurs, whereby a substantial portion of the vegetative cells are killed.
  • the particular duration of preheating step is arbitrary and not a limitation of this invention.
  • the particular time duration and temperature are selected to achieve an optimally efficient operation. For example, at a preheating temperature of 165 degrees the 8 particles are preferably heated for a duration of approximately 15 minutes. It is believed that in this time approximately 90% of the vegetative bacterial cells are destroyed.
  • the temperature be kept below 210 degrees Fahrenheit and the preheating be performed for no longer than 20 minutes. At times and temperatures above these levels, the additional bacteria that are destroyed typically do not justify the increased energy requirements.
  • This preheating step is improved considerably because the particles are shredded or chopped prior to the preheating step. This increases the surface area of the waste and permits heat to be transferred much more effectively through the biological waste as it is preheated, so that vegetative bacterial extermination is enhanced.
  • the preheated particles are delivered to a sterilization chamber 16 wherein they are heated by steam 17 to a temperature of at least 248 degrees Fahrenheit (120 degrees Centigrade). Again, the particles enhance the heat transfer and significantly improve the sterilization process.
  • the particles are heated in chamber 16 for a period of 30 minutes, although the precise duration is not a limitation of this invention. Nonetheless, the steam sterilization of the particles continues for a sufficient time such that the remaining biological contaminants are killed and the particles are thereby sterilized. If the sterilization process is conducted at a temperature higher than 248 degrees Fahrenheit, a time commensurately less than 30 minutes may be required. For example, if a temperature of 266 degrees Fahrenheit (130 degrees
  • Centigrade Centigrade
  • a duration of 15 minutes is typically sufficient to exterminate most of the spores and remaining bacteria.
  • the longest practical duration for the sterilization process is approximately 40 minutes and the highest practical temperature at which the sterilization process may be operated is 330 degrees Fahrenheit. Within these time and temperature limits, the precise temperature and time duration of the sterilization process are selected to achieve a desired level of bacterial extermination.
  • This level can be tested through the use of conventional bacterial test strips.
  • Shredder mechanism 12 includes a conventional shredder or chopper device 34 and a feed hopper 36 for introducing material 10 into shredder 34.
  • a lid 38 is pivotably secured to hopper 36 for selectively covering and uncovering the entrance thereof.
  • a source of purge steam 37 is connected to hopper 36. This steam serves to decontaminate the hopper following the chopping operation, as described more fully below.
  • Preheating chamber 14 includes an elongate, generally cylindrical enclosure.
  • An inlet 40 interconnects chamber 14 with the source of preheating steam 15.
  • An outlet 42 at opposite end of chamber 14 discharges preheating steam from the interior of the chamber.
  • free-flowing steam may be provided through chamber 14.
  • Chamber 14 houses a conventional screw conveyer.
  • a jacket 44 is wrapped about the exterior surface of chamber 14. Jacket 44 includes an inlet 46 and an outlet 48 for conducting steam and condensate respectively into and out of the jacket. This jacket operates to maintain the temperature in the preheating chamber in the manner described more fully below.
  • Rrst transmittal means 50 are provided between the shredder mechanism 12 and the preheating chamber 14. More particularly, the first transmittal means include a storage chamber 52 and a first valve 54, shown alone in RG. 3, for selectively transmitting material from the shredder device 34 to the storage chamber 52.
  • first valve 54 comprises a conventional star valve having preferably four identical compartments 51, 53, 55 and 57.
  • the valve 54, and any of the other valves described below may include an alternative number of compartments.
  • the valve is operated in a known manner under the direction of a microprocessor (described below) or otherwise such that it rotates in the direction of arrow 59.
  • Each of the compartments 51 - 57 is communicably aligned once during each rotation with a discharge portion 282 of shredder 34 and an inlet portion 83 of storage chamber 52.
  • a second valve 56 shown alone in RG. 4, is located at the opposite lower end of storage chamber 52 for selectively transmitting material from the storage chamber to the preheating chamber 14.
  • Second valve 56 comprises a four compartment star valve having compartments 61, 63, 65 and 67. Valve 56 is likewise controlled by a microprocessor or other control means to rotate in the direction of arrow 69.
  • Sterilization chamber 16, RG. 2 has an inlet 60 that interconnects the chamber with a source of sterilizing steam 19.
  • An outlet 62 discharges the sterilizing steam from chamber 16, such that free-flowing steam may be provided through chamber 16.
  • the sterilizing chamber may comprise various types of conventional mechanisms for moving waste material through and dispersing that material in the sterilization chamber.
  • the sterilization chamber may include a conventional paddle-type conveyer or a conventional helical or screw-type conveyer. Alternatively, various other types of conveyers may be utilized.
  • a jacket 64 is disposed about the outer surface of sterilization chamber 16. Jacket 64 includes an inlet 66 and an outlet 68 for respectively introducing steam into and removing steam from the jacket.
  • the jacket is preferably maintained at a pressure of about 20 - 25 psig such that the exterior surface of the sterilizing chamber is held at a desired temperature.
  • Each of the compartments 61 - 67 communicably aligns once each rotation with discharge chute 73 of storage chamber 52 and inlet 75 of preheating chamber 14.
  • Sterilization chamber 16 is selectively connected to preheating chamber 14 by second transmittal means 70, shown alone in RG. 5.
  • the second transmittal means 70 includes a star valve assembly 72 having five identical compartments 74, 76, 78, 80 and 82.
  • the second transmittal means 70 also includes a discharge chute 84 depending from preheating chamber 14 and an inlet section 86 formed in sterilization chamber 16.
  • Valve 72 is rotatable in the direction of arrows 88 by a controller or otherwise. During each rotation, each of the compartments 74 - 82 is communicably aligned with the discharge chute 84 and the inlet section 86. Additionally, a vacuum port 90 and a steam injection port 92 are engaged with valve 72 such that during each rotation of the valve each of the compartments communicates with each of the ports 90 and 92.
  • Third transmittal means 74 includes a fourth star valve 94, which has five identical compartments 96, 98, 100, 102 and 103. Valve 94 is driven, again typically by a controller, in the direction of arrow 104.
  • the third transmittal means also includes a discharge chute 106 depending from sterilization chamber 16 and an inlet section 108 formed into compactor 18. During each rotation of valve 94, each of the compartments
  • each of the compartments is communicably aligned with a vacuum outlet 110 and a pressurizing port 112.
  • apparatus 30 operates to sterilize biological waste in the following manner.
  • Hopper cover 38 is opened to the position shown in phantom and red bag waste 10 is introduced into the feed hopper 36.
  • the hopper channels the waste into shredder device 34, which shreds or chops the waste material into particles of reduced size.
  • a screen 280 having openings of a predetermined size is disposed in or below the shredder so that only fine particles of waste are discharged from shredder device 34. More particularly, screen 280 blocks passage of particles that are more than
  • the screen openings are 1/4" by 1/4", so that particles larger than 1/4" are not discharged. As shown most clearly in RGS. 2 and 3, chopped particles P fall through discharge chute 282 of shredder device 34 and into the compartments 51, 53,
  • valve 54 continues to rotate in the direction of arrow 59 and, as each compartment aligns with section 83, the particles P are discharged from the compartment in the direction of arrow 118 into section 83 of storage chamber 52. This process continues until the waste 10 is completely shredded or chopped. At that point, the shredder is shut off and valve 54 is stopped. As a result, the valve is closed and the chopped particles are not allowed to re-enter the shredder device 34; rather they remain securely within the storage chamber 52.
  • valve 56 When valve 56 is in an "off" condition, it does not operate and therefore seals the bottom of storage chamber 52 so that particulate waste material P collects in the chamber.
  • the waste is not transmitted into preheating chamber 14 unless and until the chamber is sufficiently heated. This is accomplished by introducing steam 15, RG. 2, at a pressure of approximately 15 psig into chamber 14 through inlet 40.
  • the steam is discharged through outlet 42 and is free-flowing.
  • the internal temperature of the preheating chamber is raised in this manner to at least 140 degrees Fahrenheit, and preferably at least 165 degrees Fahrenheit, and the pressure is maintained slightly above zero psig so that free flowing steam is provided through the preheating chamber.
  • valve 56 When these conditions are sensed, valve 56 is operated in the manner shown in RG. 4.
  • Chopped particles P fall in the direction of arrow 129 through chute 73 of storage chamber 52 and into the revolving compartments 61, 63, 65 and 67.
  • a pile of waste 130 collects in each compartment and as each compartment aligns with inlet 75, the particles P are deposited in the direction of arrow 132 through the inlet 75 and into preheating chamber 14.
  • the valve continues to rotate until the emptied compartment returns to communicable alignment with discharge chute 73 in order to receive additional particles from the storage chamber.
  • the conveyer housed by preheating chamber 14 is operated to drive the chopped particles through the chamber in the direction of arrow 136, RG. 2 such that the particles are heated by the steam. More particularly, the screw conveyer moves the particles helically through the chamber.
  • the particles are tumbled and dispersed so that heat transfer is increased.
  • the particles are driven to the upper end of chamber 14 and upon reaching that end they may be returned to the opposite lower end of the conveyer by a suitable baffling apparatus.
  • the particles are heated by the free-flowing steam to at least 140 degrees Fahrenheit and preferably 165 degrees
  • star valve 72 During the preheating period, star valve 72, RGS. 2 and 5, remains in an "off" condition so that access from chamber 14 to sterilizing chamber 16 is blocked and all of the chopped particles remain in chamber 14 for the desired preheating duration.
  • valve 72 is driven in the direction of arrows 82.
  • Each successive compartment 74, 76, 78, 80 and 82 communicably engages discharge chute 84 to receive particles P, as well as steam and air from the preheating chamber 14. This material falls, in the direction of arrow 140, into the aligned compartment and the particles form a pile 142 therein.
  • compartment 76 The compartment then rotates into communicable engagement with vacuum port 90. As exhibited by compartment 76, vacuum 90 draws a vacuum in the engaged compartment thereby removing the air and steam from the compartment. This step is performed to maintain the desired temperature in chamber 16. If the air from the preheating chamber is introduced into the sterilizing chamber, where the pressure is 15 psig, that air will have a temperature of only 224.6 degrees Fahrenheit, which is significantly below the required sterilization temperature of 248 degrees Fahrenheit.
  • each compartment is next engaged with pressurizing port 92.
  • Steam 150 at 15 psig is introduced through port 92 into the compartment so that the compartment is pressurized.
  • the particles P and attendant steam are deposited in the direction of arrows 152 through inlet 86 into sterilization chamber 16. Without the addition of steam 150, the vacuum drawn in the compartment would tend to hold the pile 142 of particles P in the compartment as it engages the inlet 86.
  • valve 72 continues to rotate in the direction of 88 so that the compartment previously aligned with inlet 86 is in the position of compartment 82. Finally, the compartment is rotated to the position of compartment 74, in substantial alignment with discharge chute 84 from preheating chamber 14, so that additional preheated particles may be collected.
  • the preheated particles are conveyed through and dispersed in chamber 16 by an appropriate conveyer. As previously described, this may comprise a paddle-type or screw- type conveyer. As the particles are conveyed and dispersed, free-flowing sterilizing steam 19 is introduced into chamber 16 through inlet 60 and discharged therefrom through inlet 62. This steam heats the particles in the chamber to at least 248 degrees Fahrenheit and maintains the pressure inside the chamber at 15 psig. Once again, steam is introduced through jacket 64 to heat the exterior of the sterilization chamber and maintain the sterilizing temperature within the chamber. The particles are driven in the direction of arrow 164 through the chamber.
  • an appropriate conveyer As previously described, this may comprise a paddle-type or screw- type conveyer.
  • free-flowing sterilizing steam 19 is introduced into chamber 16 through inlet 60 and discharged therefrom through inlet 62. This steam heats the particles in the chamber to at least 248 degrees Fahrenheit and maintains the pressure inside the chamber at 15 psig.
  • steam is introduced through jacket 64 to
  • a suitable baffle may be constructed by those skilled in the art, such that when the particles reach the right hand of the sterilization chamber their direction is reversed.
  • the particles continue to be driven through the conveyer and heated to at least 248 degrees Fahrenheit for a desired duration. As stated above, when the minimum temperature is employed, this duration should be for at least 30 minutes. The sterilizing period may be reduced if higher temperatures are utilized.
  • valve 74, RGS. 2 and 6 remains in an "off" condition so that access between sterilization chamber 16 and compactor 18 is blocked.
  • valve 74 is started and driven rotatably in the direction of arrow 104.
  • compartments 96, 98, 100, 102 and 103 are successively aligned with discharge chute 106 from chamber 16.
  • the valve 94 continues to rotate until the compartment reaches the position of compartment 98. At this point the compartment is engaged with vacuum port 110 and a vacuum is drawn on the compartment. As a result, the remaining steam is removed from the compartment and a pile of sterilized particles 172 remains.
  • the compartment then rotates to the position of compartment 100, and air 113 is introduced into the compartment through port 112 in the direction of arrows 174 such that the compartment is pressurized.
  • air 113 is introduced into the compartment through port 112 in the direction of arrows 174 such that the compartment is pressurized.
  • the valve continues to rotate and 17 the compartment reaches the position of compartment 102, particles P fall through the inlet 108 into compactor 18, RG. 2.
  • the sterilized particles are compacted therein and are removed and disposed of in a conventional manner.
  • the effectiveness of the preheating and sterilizing steps may be tested by employing a known spore sample containing a predetermined amount of bacterial spores of a known heat resistant species. This sample is introduced, such as through an entrance in the storage chamber and is allowed to run through the preheating and sterilizing chambers. At the completion of these stages the sample is investigated and the percentage of bacteria destroyed is determined. If increased sterilization is required, the times and temperatures of the respective stages may be adjusted accordingly.
  • the apparatus 30 shown in RG. 2 may be either manually or automatically controlled.
  • a controller 200 may be utilized to automatically control operation of the system.
  • Controller 200 may comprise a conventional microprocessor or alternative means known to those skilled in the art.
  • the controller receives inputs from shredder 34. When the shredder is "on” the controller maintains first valve 54 in an open condition so that chopped particles fall into the storage chamber. When shredder 34 is turned off the controller responds by closing valve 54 and initiating the introduction of purge steam 37 into the feed hopper.
  • the controller receives preheat temperature and pressure inputs and a jacket pressure input from sensors 202, 204 and 206, respectively.
  • second valve 56 is operated, as described above, to transmit chopped particles into chamber 14 for preheating.
  • the controller directs steam 15 into the preheating chamber so that the required parameters are maintained. If the steam pressure in preheat jacket 44 is insufficient the controller 200 directs additional steam into the 18 jacket. If cool spots develop in the preheat chamber, such cool spots are typically detected by sensor 202 and as a result, controller 200 stops valve 56 so that the transmission of chopped particles into the preheated is blocked until the required temperature level is regained. Controller 200 likewise provides an output to control the preheat conveyer 208. If the temperature inside preheat chamber 14 is insufficient, the conveyer is stopped until a sufficient temperature is reached. The controller is also programmed with the required time duration for the preheating stage. At the completion of this period, preheat steam 15 and preheat conveyer 208 are stopped and valve 56 is closed.
  • a second group of temperature and pressure sensors 210, 212 and 214 are provided for the sterilization chamber. Each provides an input to controller 200. At or about the completion of the preheating stage, the controller initiates introduction of sterilizing steam 19 into chamber 16 and commences operation of sterilizer conveyer 216. The controller also commences operation of third star valve 72 so that preheated particles are transmitted to the sterilization chamber. The sterilizing process is then continued for a preprogrammed duration. Again, if the temperature or pressure parameters for sterilization chamber 16 fall below their required levels, the controller 200 may either halt the operation of valve 72 and conveyer 216 or increase the level of either the sterilizing steam 19 or the jacket steam 64. During the sterilizing stage, the controller also provides outputs to control the vacuum 89 drawn on valve 72 and the steam 150 subsequently introduced into the valve.
  • valve 72 is stopped to block access between the preheating chamber and the sterilization chamber.
  • Fourth star valve 74 is now operated so that sterilized particles are transmitted from the sterilization 19 chamber to compactor 18.
  • the controller instructs the compactor to perform its operation.
  • the controller also provides inputs to vacuum apparatus 111, which draws a vacuum on each successive compartment of valve 74, and pressure source 113, which subsequently pressurizes the evacuated compartment.

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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)
  • Processing Of Solid Wastes (AREA)

Abstract

Un appareil (30) de stérilisation de déchets biologiques est décrit. Les déchets sont introduits dans un mécanisme de déchiquetage (34) qui les réduit en petites particules, lesquelles sont transférées vers une chambre de préchauffage (14). De la vapeur (15) est introduite dans la chambre et préchauffe les particules jusqu'à une température d'au moins 140 degrés Fahrenheit. Une quantité choisie d'articles préchauffés est transférée en continu dans une chambre de stérilisation (16) et de la vapeur (17) introduite dans ladite chambre pour chauffer les particules préchauffées jusqu'à une température d'au moins 248 degrés Fahrenheit, et ce, suffisamment longtemps pour que les particules soient stérilisées.
PCT/US1994/013123 1991-04-01 1994-11-14 Procede et appareil de sterilisation de dechets biologiques WO1996014883A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/677,999 US5364589A (en) 1991-04-01 1991-04-01 Method and apparatus for sterilizing biological waste
PCT/US1994/013123 WO1996014883A1 (fr) 1991-04-01 1994-11-14 Procede et appareil de sterilisation de dechets biologiques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/677,999 US5364589A (en) 1991-04-01 1991-04-01 Method and apparatus for sterilizing biological waste
PCT/US1994/013123 WO1996014883A1 (fr) 1991-04-01 1994-11-14 Procede et appareil de sterilisation de dechets biologiques

Publications (1)

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WO1996014883A1 true WO1996014883A1 (fr) 1996-05-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1767228A2 (fr) * 2000-10-10 2007-03-28 Medivac Technology PTY Limited Mécanisme de déchiquetage de déchet
CN102018989A (zh) * 2010-10-19 2011-04-20 山东新华医用环保设备有限公司 医疗废物旋转灭菌器
IT201900008013A1 (it) * 2019-06-05 2019-09-05 Ompeco S R L Dispositivo e procedimento per la normalizzazione e sterilizzazione di materiali solidi misti contenenti frazioni organiche

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5048766A (en) * 1990-05-25 1991-09-17 Gaylor Michael J Apparatus and method for converting infectious waste to non-infectious waste

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5048766A (en) * 1990-05-25 1991-09-17 Gaylor Michael J Apparatus and method for converting infectious waste to non-infectious waste

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1767228A2 (fr) * 2000-10-10 2007-03-28 Medivac Technology PTY Limited Mécanisme de déchiquetage de déchet
EP1767228A3 (fr) * 2000-10-10 2007-09-19 Medivac Technology PTY Limited Mécanisme de déchiquetage de déchet
CN102018989A (zh) * 2010-10-19 2011-04-20 山东新华医用环保设备有限公司 医疗废物旋转灭菌器
IT201900008013A1 (it) * 2019-06-05 2019-09-05 Ompeco S R L Dispositivo e procedimento per la normalizzazione e sterilizzazione di materiali solidi misti contenenti frazioni organiche

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