The sterilization process of the medical sterilizer uses vaporized hydrogen peroxide
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Summary: The second sterilization process uses vaporized hydrogen peroxide. Before being converted to steam in the sterilization chamber, this hydrogen peroxide is stored as a liquid in a reservoir. During use, the liquid sterilant is sprayed from the reservoir into the system to kill microorganisms on the equipment. This application uses a pressure sensor to measure the pressure exerted by the liquid in the sterilant reservoir on the pressure sensor itself, thus indicating the hydrogen peroxide level.
Sterilization of medical equipment is one of the most important processes in healthcare. It eliminates all living microorganisms on medical and dental equipment, including bacteria, spores, viruses, and fungi, ensuring the safety and reusability of these devices. While various sterilization methods exist, hydrogen peroxide is widely used in healthcare facilities, hospitals, and dental clinics due to its effectiveness, safety, and affordability. Below, we explore two hydrogen peroxide sterilization techniques and how to select the right pressure sensor for sterilization equipment based on sensor technical parameters and operational characteristics.
Two different sterilization processes utilize hydrogen peroxide. Each requires different measurement equipment to ensure proper operation. The first process, plasma sterilization, uses a capacitive vacuum pressure gauge to measure the process pressure during the sterilization cycle. Medical devices, including scalpels and catheters, dental equipment, and other devices with grooves and channels, are placed in the sterilizer chamber. The chamber is then sealed, and a vacuum is created. Hydrogen peroxide sterilant from a pre-packaged container is injected into the chamber. Upon vaporization, the sterilant interacts with the surfaces of the medical/dental devices, causing a pressure increase; the pressure then decreases again, creating plasma. The free radicals of the hydrogen peroxide interact with and kill microorganisms. Afterward, the hydrogen peroxide decomposes, leaving only water vapor and oxygen. Medical devices can be used immediately after sterilization or stored.
To ensure effective sterilization, a specific base pressure is needed within the sterilizer chamber when generating plasma. A capacitive vacuum pressure gauge is installed on the sterilizer to monitor and/or control chamber pressure, maintaining proper pressure at all stages. When choosing a vacuum pressure gauge for your application, partner with a supplier offering a range of products: different full-scale pressure ranges from 10 to 1000 Torr, reading accuracy of ±0.5% (with ±0.25% accuracy as an option, if available), and a negligible temperature coefficient within a temperature compensation range of 0°C to 50°C.
The second sterilization process uses vaporized hydrogen peroxide, stored in liquid form in a reservoir before being converted to steam within the sterilization chamber. During use, the liquid sterilant from the reservoir is sprayed into the system to kill microorganisms on the equipment. This application employs a gauge pressure sensor to measure the pressure exerted by the liquid sterilant in the reservoir, indicating the hydrogen peroxide level.
This sterilization process works as follows: The pressure sensor is mounted at the bottom of the sterilant reservoir. The weight of the sterilant exerts pressure on the sensor. Ventilation tubes within the sensor's rear cable allow the sensor to measure pressure relative to local atmospheric pressure (gauge measurement). As the sterilant is consumed, the weight (pressure) decreases, and the output signal sent by the sensor to the redundant monitoring system also decreases accordingly. The sensor then alerts sterilization technicians to low reservoir levels. When the sensor reading is 0 PSIG, the reservoir is empty.
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