Autoclave
An autoclave is a machine used to carry out industrial and scientific processes requiring elevated temperature and pressure in relation to ambient pressure/temperature. Autoclaves are used in medical applications to perform sterilization and in the chemical industry to cure coatings and vulcanize rubber and for hydrothermal synthesis. Industrial autoclaves are used in industrial applications, especially in the manufacturing of composites.
 Cutaway illustration of a jacketed rectangular-chamber autoclave | |
| Uses | Sterilization |
|---|---|
| Inventor | Charles Chamberland |
| Related items | Waste autoclave |
Many autoclaves are used to sterilize equipment and supplies by subjecting them to pressurized saturated steam at 121 °C (250 °F) for around 15–20 minutes depending on the size of the load and the contents.[1] The autoclave was invented by Charles Chamberland in 1879,[2] although a precursor known as the steam digester was created by Denis Papin in 1679.[3] The name comes from Greek auto-, ultimately meaning self, and Latin clavis meaning key, thus a self-locking device.[4]
Uses
Sterilization autoclaves are widely used in microbiology, medicine, podiatry, tattooing, body piercing, veterinary medicine, mycology, funerary practice, dentistry, and prosthetics fabrication. They vary in size and function depending on the media to be sterilized and are sometimes called retort in the chemical and food industries.
Typical loads include laboratory glassware, other equipment and waste, surgical instruments, and medical waste.[5][6]
A notable recent and increasingly popular application of autoclaves is the pre-disposal treatment and sterilization of waste material, such as pathogenic hospital waste. Machines in this category largely operate under the same principles as conventional autoclaves in that they are able to neutralize potentially infectious agents by using pressurized steam and superheated water. A new generation of waste converters is capable of achieving the same effect without a pressure vessel to sterilize culture media, rubber material, gowns, dressings, gloves, etc. It is particularly useful for materials which cannot withstand the higher temperature of a hot air oven.[7]
Autoclaves are also widely used to cure composites, especially for melding multiple layers without any voids that would decrease material strength, and in the vulcanization of rubber.[8] The high heat and pressure that autoclaves generate help to ensure that the best possible physical properties are repeatable. Manufacturers of spars for sailboats have autoclaves well over 50 feet (15 m) long and 10 feet (3 m) wide, and some autoclaves in the aerospace industry are large enough to hold whole airplane fuselages made of layered composites.[9]
Other types of autoclaves are used to grow crystals under high temperatures and pressures. Synthetic quartz crystals used in the electronics industry are grown in autoclaves. Packing of parachutes for specialist applications may be performed under vacuum in an autoclave, which allows the chutes to be warmed and inserted into their packs at the smallest volume.
Air removal
It is very important to ensure that all of the trapped air is removed from the autoclave before activation, as trapped air is a very poor medium for achieving sterility. Steam at 134 °C (273 °F) can achieve a desired level of sterility in three minutes, in contrast to hot air at 160 °C (320 °F), which can take two hours to achieve the same sterility.[10]
Methods of air removal include:
Downward displacement (or gravity-type): As steam enters the chamber, it fills the upper areas first as it is less dense than air. This process compresses the air to the bottom, forcing it out through a drain which often contains a temperature sensor. Only when air evacuation is complete does the discharge stop. Flow is usually controlled by a steam trap or a solenoid valve, but bleed holes are sometimes used. As the steam and air mix, it is also possible to force out the mixture from locations in the chamber other than the bottom.
Steam pulsing: air dilution by using a series of steam pulses, in which the chamber is alternately pressurized and then depressurized to near atmospheric pressure.
Vacuum pumps: a vacuum pump sucks air or air/steam mixtures from the chamber.
Superatmospheric cycles: achieved with a vacuum pump. It starts with a vacuum followed by a steam pulse followed by a vacuum followed by a steam pulse. The number of pulses depends on the particular autoclave and cycle chosen.
Subatmospheric cycles: similar to the superatmospheric cycles, but chamber pressure never exceeds atmospheric pressure until they pressurize up to the sterilizing temperature.
In medicine
A medical autoclave is a device that uses steam to sterilize equipment and other objects. This means that all bacteria, viruses, fungi, and spores are inactivated. However, prions, such as those associated with Creutzfeldt–Jakob disease, and some toxins released by certain bacteria, such as Cereulide, may not be destroyed by autoclaving at the typical 134 °C for three minutes or 121 °C for 15 minutes. Although a wide range of archaea species, including Geogemma barosii, can survive and even reproduce at temperatures above 121 °C, none of them are known to be infectious or otherwise pose a health risk to humans; in fact, their biochemistry is so different from our own and their multiplication rate is so slow that microbiologists need not worry about them.
Autoclaves are found in many medical settings, laboratories, and other places that need to ensure the sterility of an object. Many procedures today employ single-use items rather than sterilizable, reusable items. This first happened with hypodermic needles, but today many surgical instruments (such as forceps, needle holders, and scalpel handles) are commonly single-use rather than reusable items (see waste autoclave). Autoclaves are of particular importance in poorer countries due to the much greater amount of equipment that is re-used. Providing stove-top or solar autoclaves to rural medical centers has been the subject of several proposed medical aid missions.
Because damp heat is used, heat-labile products (such as some plastics) cannot be sterilized this way or they will melt. Paper and other products that may be damaged by steam must also be sterilized another way. In all autoclaves, items should always be separated to allow the steam to penetrate the load evenly.
Autoclaving is often used to sterilize medical waste prior to disposal in the standard municipal solid waste stream. This application has become more common as an alternative to incineration due to environmental and health concerns raised because of the combustion by-products emitted by incinerators, especially from the small units which were commonly operated at individual hospitals. Incineration or a similar thermal oxidation process is still generally mandated for pathological waste and other very toxic or infectious medical waste.
In dentistry, autoclaves provide sterilization of dental instruments.
In most of the industrialized world medical-grade autoclaves are regulated medical devices. Many medical-grade autoclaves are therefore limited to running regulator-approved cycles. Because they are optimized for continuous hospital use, they favor rectangular designs, require demanding maintenance regimens, and are costly to operate. (A properly calibrated medical-grade autoclave uses thousands of gallons of water each day, independent of task, with correspondingly high electric power consumption.)
In research
Most medical-grade autoclaves are inappropriate for research tasks. General-use non-medical (often called "research-grade") autoclaves are increasingly used in a wide range of education, research, and industrial settings (including biomedical research) where efficiency, ease-of-use, and flexibility are at a premium. Research-grade autoclaves may be configured for "pass-through" operation. This makes it possible to maintain absolute isolation between "clean" and potentially contaminated work areas. Pass-through research autoclaves are especially important in BSL-3 or BSL-4 facilities.
Research-grade autoclaves—which are not approved for use in sterilizing instruments that will be directly used on humans—are primarily designed for efficiency, flexibility, and ease-of-use. They display a wide range of designs and sizes, and are frequently tailored to their use and load type. Common variations include either a cylindrical or square pressure chamber, air- or water-cooling systems, and vertically or horizontally opening chamber doors (which may be electrically or manually powered).
In 2016, the Office of Sustainability at the University of California, Riverside (UCR) conducted a study of autoclave efficiency in their genomics and entomology research labs, tracking several units' power and water consumption. They found that, even when functioning within intended parameters, the medical-grade autoclaves used in their research labs were each consuming 700 gallons of water and 90 kWh of electricity per cycle (1,134MWh of electricity and 8.8 million gallons of water total). UCR's research-grade autoclaves performed the same tasks with equal effectiveness, but used 83% less energy and 97% less water.[11]
Quality assurance
There are physical, chemical, and biological indicators that can be used to ensure that an autoclave reaches the correct temperature for the correct amount of time. If a non-treated or improperly treated item can be confused for a treated item, then there is the risk that they will become mixed up, which, in some areas such as surgery, is critical.
Chemical indicators on medical packaging and autoclave tape change color once the correct conditions have been met, indicating that the object inside the package, or under the tape, has been appropriately processed. Autoclave tape is only a marker that steam and heat have activated the dye. The marker on the tape does not indicate complete sterility. A more difficult challenge device, named the Bowie-Dick device after its inventors, is also used to verify a full cycle. This contains a full sheet of chemical indicator placed in the center of a stack of paper. It is designed specifically to prove that the process achieved full temperature and time required for a normal minimum cycle of 134 °C for 3.5–4 minutes.
To prove sterility, biological indicators are used. Biological indicators contain spores of a heat-resistant bacterium, Geobacillus stearothermophilus. If the autoclave does not reach the right temperature, the spores will germinate when incubated and their metabolism will change the color of a pH-sensitive chemical. Some physical indicators consist of an alloy designed to melt only after being subjected to a given temperature for the relevant holding time. If the alloy melts, the change will be visible.
Some computer-controlled autoclaves use an F0 (F-nought) value to control the sterilization cycle. F0 values are set for the number of minutes of sterilization equivalent to 121 °C (250 °F) at 100 kPa (15 psi) above atmospheric pressure for 15 minutes. Since exact temperature control is difficult, the temperature is monitored, and the sterilization time adjusted accordingly.
Additional images
Stovetop autoclaves, also known as pressure cooker—the simplest of autoclaves
The machine on the right is an autoclave used for processing substantial quantities of laboratory equipment prior to reuse, and infectious material prior to disposal. (The machines on the left and in the middle are washing machines.)
Horizontal high-capacity autoclave with cylindrical chamber
Illustration of a cylindrical-chamber pass-through autoclave
References
- Black, Jacquelyn (1993). Microbiology. Prentice Hall. p. 334.
- "Chronological reference marks - Charles Chamberland (1851–1908)". Pasteur Institute. Archived from the original on 2006-12-19. Retrieved 2007-01-19.
- Hugo WB (July 1991). "A brief history of heat and chemical preservation and disinfection". J. Appl. Bacteriol. 71 (1): 9–18. doi:10.1111/j.1365-2672.1991.tb04657.x. PMID 1894581.
- "Online Etymology Dictionary". Etymonline.com. Retrieved 2012-06-04.
- "Sterilization Cycles". Consolidated Machine Corporation. Retrieved 2009-06-30.
- "Sterilization of liquids, solids, waste in disposal bags and hazardous biological substances". Retrieved 2017-04-20.
- Seymour Stanton Block (2001). Disinfection, Sterilization, and Preservation. Lippincott Williams & Wilkins. ISBN 978-0-683-30740-5. Retrieved 19 January 2013.
- R. B. Simpson (2002). Rubber Basics. iSmithers Rapra Publishing. p. 161. ISBN 978-1-85957-307-5. Retrieved 19 January 2013.
- "A new approach to making airplane parts, minus the massive infrastructure: Carbon nanotube film produces aerospace-grade composites with no need for huge ovens or autoclaves". ScienceDaily. Retrieved 2020-01-13.
- Australian/New Zealand Standard™—Office-based health care facilities—Reprocessing of reusable medical and surgical instruments and equipment, and maintenance of the associated environment
- Faugeroux, Delphine; Wells, Barbra (November–December 2016). "Laboratory autoclaves: a case study" (PDF). Laboratory Design. 20 (6): 10–12. Retrieved May 24, 2017.
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