What is true of steam-flush pressure-pulse sterilizers?

Steam-flush pressure-pulse sterilizers operate without the need for a vacuum. This type of sterilization method uses steam under pressure, which allows for the rapid heating of materials inside the chamber. By not requiring a vacuum, these sterilizers can be more effective for certain materials that may be adversely affected by a vacuum process, such as those containing liquids or delicate instruments.

The main distinction of steam-flush pressure-pulse sterilizers lies in their ability to effectively sterilize devices and surfaces through direct steam contact, utilizing the pressure generated by steam to enhance the process. This characteristic is crucial for ensuring that all surfaces of the items being sterilized are reached and effectively sterilized without the complications associated with vacuum requirements, which can create additional handling and operational challenges.

Other options wouldn't be suitable in this context because steam-flush pressure-pulse sterilizers are not limited to just liquids, meaning they can process a variety of items, and while they do operate under pressure, they do not necessarily utilize the high pressure seen in other forms of sterilization that depend on a vacuum system to displace air. Thus, the ability to function without vacuum is a significant advantage of this sterilization method.