Robotics in aseptic manufacturing: what Annex 1 expects

What does Annex 1 say about robotics?

The revised Annex 1, Manufacture of Sterile Medicinal Products, was published in August 2022 and came into operation on 25 August 2023, with one provision on lyophilizer loading following a year later. Section 2.1 says that the use of appropriate technologies, giving restricted access barrier systems (RABS), isolators, robotic systems, rapid or alternative methods and continuous monitoring systems as examples, should be considered to increase the protection of the product from potential extraneous sources of contamination.

The annex treats barrier technology as the expected direction. It describes RABS and isolators as beneficial in assuring the required conditions and minimizing microbial contamination from direct human interventions in the critical zone, and asks that alternative approaches be justified.

How do barrier and robotic systems compare?

Each step along this range reduces how often a person reaches into the zone where sterile product is exposed. A gloveless robotic isolator removes the glove ports altogether: format parts, components and filled units are handled by the robot, and the enclosure stays closed from decontamination to the end of the batch.

What changes for contamination control?

• The contamination control strategy has to cover the robot itself: surfaces that can be cleaned and decontaminated, materials compatible with vaporized hydrogen peroxide, and particles generated by its movement.
• Robot paths are designed so the arm does not pass over open containers and disturb first air.
• Environmental monitoring continues. With no operator present, sampling plates and probes have to be placed and removed by the robot or by design.
• Aseptic process simulation covers the routine robot operations and the interventions that remain, such as fault recovery.
• Fault handling is defined in advance: which stoppages the robot recovers from, which require the enclosure to be opened, and what happens to the product exposed at that moment.

How are the robot and its software validated?

A filling robot is equipment and a computerised system at once. Its qualification covers the mechanical side, and its software, recipes and vision systems fall under Annex 11 in the EU and the equivalent expectations elsewhere. A risk-based approach fits well: a recipe parameter that sets fill volume or stopper placement is high risk and gets scripted testing, while a screen that only displays status does not.

Where machine vision or machine learning is added, for example to inspect containers or guide the arm, the model needs its own evidence: a defined intended use, test data kept apart from training data, and control over changes.

What does the quality unit decide?

• Batch disposition stays with the quality unit. A robotic line produces more data per batch and the same decision.
• Excursions and alarms are reviewed by people, with the assessment recorded.
• Changes to recipes, paths and software go through change control with an impact assessment.
• The data the line generates, from particle counts to torque curves, is reviewed for trends, which is where early signals of drift appear.