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Steam sterilization

Steam sterilization is carried out using saturated steam, usually at a temperature of 134 ° C.

The formation of stains as a result of "molting" chemical indicators

A large number of chemical indicators in one batch of sterilized can lead to the formation of stains on the instruments, especially during direct contact. This concerns, first of all, silverware or with a silver-plated surface.

Ensure steam quality in accordance with EN 285!

In the case of the use of certified steam sterilization processes in accordance with ISO 17665, EN 554 (for German DIN 58946 part 6) with appropriate documentation indicating the required parameters, such as pressure, temperature and the content of inert gases in the steam, you can refuse the use of chemical and biological indicators to control the batch to be processed, if three parameters important from a process point of view are continuously monitored. The steam must not contain any foreign particles that may interfere with the sterilization process and damage the instruments and the sterilizer.

Substance / Property Condensate

Silicates (SiO2) <0.1 mg / l

Iron <0.1 mg / l

Cadmium <0.005 mg / L

Lead <0.05 mg / L

Heavy metals in the sediment except iron, cadmium and lead <0.1 mg / l

Chlorides (CI-) <0.1 mg / l

Phosphates (P2O5) <0.1 mg / l

Conductivity (at 25 ° C) <3 μS / cm

PH value (acidity) 5 to Appearance colorless, transparent, without sediment

Hardness I (alkaline earth ions) <0.02 mmol / l

Note: Condensate sampling method is given in 22.4.

Source: EN 285, edition 2 The high content of bicarbonate in drinking water leads to an increased content of inert gases in the steam used for sterilization and impairs sterilization results.

Risk of corrosion due to residual moisture / moisture

Moisture in containers may cause rusting of the instrument. Often the cause of poor, inadequate drying is improper loading, as well as the use of poorly usable nonwoven fabric for drying.

Permissible values ​​for the content and concentration of various substances in boiled water and condensate should not exceed the values ​​given in Table B.1 of EN 285. Otherwise, rust particles, for example, from the steam supply system can cause corrosion, and excessive silicic acid can cause discoloration of tools.

Condensate contamination of the steam supply system of sterilizers defined in the supply line of the sterilizer

Usually, heavy mesh trays should be installed at the bottom so that a large part of the condensate can immediately drain. In the case of sterilization units (30x30x60 cm) weighing more than 10 kg (according to EN 868), special drying measures should be checked when checking the suitability. The permissible level of residual moisture content in practice should be considered as individual water droplets (not pools), drying out within 15 minutes. There may be stains. Measures to prevent residual moisture / moisture can be agreed with the manufacturer of the sterilizer.

As a rule, dental instruments can be sterilized in the same way as surgical instruments.
If you need additional special processing, the following rules apply:

¦ Rotary tools (cutters and burs) can be steam sterilized.

¦ Tips should be steam sterilized at 134 ° C due to a shorter holding time.

¦ To sterilize turbines, refer to the manufacturer's instructions.

¦ Dental mirrors can be sterilized with steam, but over time they become dull due to moisture penetration and as a result of different thermal expansion of materials.

All engine systems can be steam sterilized at 134 ° C. The instructions should be guided by the manufacturer, for example, fixation during sterilization.

Compressed air hoses during sterilization must be protected against compression and fracture. They should be laid in trays so that their bending radii are not less than acceptable values.

Limited durability and performance due to cracks / kinks

When sterilizing battery-powered systems, it is imperative that you follow the manufacturer's instructions when handling battery. Prolonged exposure to temperature on batteries noticeably reduces their charge state.

Instruments for minimally invasive surgery, rigid endoscopes, fiber optic cables, HF instruments can usually be sterilized similarly to surgical instruments. Autoclavable optical systems are best sterilized at 134 ° C than at 121 ° C, since at the same time they are exposed to a lower temperature load. Alternatively, you can perform H2O2 peroxide-plasma sterilization, with the temperature load completely eliminated. To prevent damage, optical devices during sterilization should be laid in accordance with the manufacturer's instructions.

Flexible endoscopes cannot be steam sterilized due to low resistance to heat. If necessary, their sterilization should be applied low-temperature sterilization. However, endoscopic instruments (clamps, catheters, etc.) can be steam sterilized.

Tools made of elastic materials (with or without a balloon), such as silicone and natural rubber (rubber or latex), can be steam sterilized. It is better to sterilize them at 134 ° C, since this requires less sterilization time. However, thermoplastic or plastic products can be steam sterilized only if allowed by the manufacturer.

When autoclaving tools made of elastic materials, all cavities (convex parts of masks, cylinders) must be in the open state to avoid damage due to pressure difference.

Cavity, closed valves, before sterilization must be completely free from water and air with a syringe.

The working parts of the respiratory systems can be sterilized with steam at a temperature not higher than 134 ° C. Cavities should be opened so as not to damage the valves.

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Steam sterilization

  1. Instruction No. 154.021.98 PI on the use of single-use sterilization indicators IS-120, IS-132, IS-160, IS-180 for monitoring the parameters of operating modes of steam and air sterilizers
    AGREED NIIID Director Academician of the Russian Academy of Medical Sciences MG Shandala, 01/07/99. APPROVED: Head of the Department of State Sanitary and Epidemiological Surveillance of the Ministry of Health of Russia A.A. Monisov 07/18/99. control parameters parameters (temperature, time) of steam and air sterilizers. The use of indicators allows you to detect non-compliance with the sterilization regime, due to technical failure of sterilizers,
  2. Guidelines for the control of sterilization using sterilization indicators IS-120, IS-132, IS-160, IS-180 of the Scientific-Production Company "VINAR"
    APPROVED Head of the Department of Prevention Ministry of the R.I. KHALITOV Healthcare of the Russian Federation dated 11.06.93 No. 11-8 / 03-54 General Provisions These Guidelines are intended for all health care workers performing work related to the decontamination and sterilization of medical instruments and medical devices, as well as
  3. Guidelines for monitoring the operation of steam and air sterilizers
    APPROVED Head of the Main Epidemiological Department of the USSR Ministry of Health M.I. NARKEVICH dated 28.02.91 No. 15 / 6-5 (Extracts) General Provisions The methodological guidelines are intended for personnel of disinfection and sanitary-epidemiological stations, as well as personnel of treatment-and-prophylactic institutions (MPI) monitoring the operation of steam and air sterilizers.
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