TST Control Helix Process Challenge Device

The TST Control™ Helix Process Challenge Device is used to verify steam penetration in steam sterilizers in accordance with ISO . The device has been developed and validated for use in Type B autoclaves and is used as a standardized test to ensure effective air removal and steam penetration during the sterilization process.

The test is based on a helical design that simulates hollow instruments (hollow load), creating one of the most demanding sterilization conditions. To achieve a passing result, steam must penetrate the entire system and reach the chemical indicator located at the end of the lumen.

The unit is operated in an otherwise empty chamber with a cycle for wrapped instruments at 134 °C for up to 3.5 minutes. After the cycle is complete, the indicator is read visually. A uniform color change indicates proper steam penetration, while deviations suggest residual air or insufficient process performance.

This product is intended for daily routine monitoring and is used as a supplement to other sterilization controls. The device comes with single-use chemical indicators, which should be replaced after a maximum of 250 uses to ensure reliable results.

Incorrect use, such as combining the indicator with indicators other than those intended, may produce misleading results and should be avoided.

Features

• Simulates hollow loads for a realistic process challenge
• Verifies steam penetration and air removal in accordance with ISO
• Standard test method for Type B autoclaves
• Clear visual indication via a chemical indicator
• Comes with single-use indicators for reliable result assessment
• Specified service life of up to 250 uses
• Suitable for routine daily monitoring of sterilization processes