RABS: A Flexible and Effective Solution for Aseptic Processing

Introduction

RABS stands for Restricted Access Barrier Systems, which are a type of sterile processing environment for non-sterile and sterile manufacturing. RABS are built inside ISO 5-7 clean rooms and provide ISO 5 unidirectional air inside the barrier to prevent contamination. RABS can be open or closed, depending on whether they allow human intervention or not. RABS are used for products that require aseptic manufacturing, such as parenteral products and certain implantable devices. RABS are different from isolators, which provide complete physical separation and quantifiable decontamination methods. RABS have some advantages over conventional clean rooms, such as higher capital costs, lower operating costs, and better toxic containment. [1][2]

Pharmaceutical companies over a decade have adopted various isolation technologies that provide a physical barrier between the production area and the operator environment. The two most common isolation technologies are restricted access barrier systems (RABS) and isolators. In this article, we will focus on RABS and explain what they are, how they work, and what are their advantages and disadvantages compared to isolators.

What are RABS?

Aseptic processing is a technique that aims to prevent microbial contamination of pharmaceutical products, such as injectables, vaccines, or sterile liquids. Aseptic processing requires a high level of control over the environment, the equipment, and the personnel involved in the production process. One of the challenges of aseptic processing is to reduce or eliminate human interventions in the critical zone, where the product is exposed to the environment. Human interventions are a major source of pollution and can compromise the quality and safety of the product.

RABS are a type of barrier system that separates the production area from the operator environment by using a rigid machine enclosure, safety-locked doors and ports with gloves. RABS provide a class A environment (ISO 5) to the critical area by using unidirectional air flow systems (also known as laminar flow) that filter the air through high efficiency filters. RABS can be divided into two categories: active and passive. Active RABS have dedicated air handling equipment that controls the air flow and pressure inside the barrier, while passive RABS are sealed to the existing ceiling of a class B cleanroom (ISO 7) and rely on the cleanroom air supply.

RABS are designed to minimize human interventions in the critical zone by using glove ports to access all areas of the enclosure during operations. However, RABS are not completely sealed and allow some degree of operator interaction, such as opening doors for material transfer or maintenance. Therefore, RABS require a high level of operator training and discipline, as well as strict adherence to standard operating procedures (SOPs) and good manufacturing practices (GMPs).

RABS are usually cleaned and decontaminated manually, using disinfectants and wipes. However, some RABS can also be combined with automated room biodecontamination systems, such as hydrogen peroxide vapor (HPV) or chlorine dioxide gas (CD), that can sterilize the entire barrier and the surrounding area.

What are the advantages and disadvantages of RABS compared to isolators?

Isolators are another type of barrier system that provide a complete separation of the production area and the operator environment by using a fully sealed enclosure with no openings or doors. Isolators are equipped with a fully reproducible and validatable system for biodecontamination, usually based on HPV, and an air handling unit that ensures temperature and pressure control inside the barrier. Isolators can operate in a class C cleanroom (ISO 8) or even outside a cleanroom, as they do not depend on the external air supply.

Isolators offer the highest level of sterility assurance and protection for the product and the environment, as they eliminate the risk of human contamination and ingress of external air. Isolators also reduce the running costs associated with gowning, environmental monitoring, cleaning, and disinfection. However, isolators also have some drawbacks, such as higher investment costs, longer setup and changeover times, lower flexibility and adaptability, and more complex maintenance and validation.

The table below summarizes the main advantages and disadvantages of RABS and isolators:

Conclusion

RABS are a viable and valuable option for aseptic processing, as they provide a physical barrier that protects the product from the environment and reduces human interventions in the critical zone. RABS are suitable for existing clean rooms that need to upgrade their filling quality and for applications that demand higher flexibility and adaptability. RABS can be implemented with minimal modifications and costs, and can accommodate different types of products and formats. RABS can also be combined with automated biodecontamination systems that can enhance the sterility and safety of the process. However, RABS also require a high level of operator training and discipline, as well as strict adherence to SOPs and GMPs, to ensure the proper operation and quality of the system.

RABS are not the only isolation technology available for aseptic processing, and they have to be compared and contrasted with isolators, which offer a higher level of sterility assurance and protection, but also entail higher investment costs, longer setup times, and lower flexibility. The choice between RABS and isolators depends on the specific product and process requirements, as well as the risk assessment and the feasibility study. Therefore, it is important to consult with a reliable and experienced RABS or isolator supplier that can provide customized solutions, technical support, and validation services.

Reference

(1) RABS vs Isolators: Understanding the differences – Esco Pharma. https://www.escopharma.com/news/rabs-vs-isolators-understanding-the-differences.

(2) What Are Restricted Access Barrier Systems (RABS)?. https://ethidelabs.com/what-are-restricted-access-barrier-systems-rabs/.

(3) RABS: restricted access barrier system for aseptic processing … – Comecer. https://www.comecer.com/rabs-restricted-access-barrier-systems-for-aseptic-processing-pharmaceutical-products/.

(4) RABS – Restricted Access Barriers System in Pharma 2023. https://flairpharma.com/rabs-restricted-access-barriers-system/.

(5) What Are Restricted Access Barrier Systems (RABS)?. https://ethidelabs.com/what-are-restricted-access-barrier-systems-rabs/.

(6) RABS, isolators and the track-and-trace trend – Cleanroom technology. https://www.cleanroomtechnology.com/rabs-isolators-and-the-track-and-trace-trend-155339.

About the author: Kossi Molley, PMP., LSSBB., Chemist