Medical device manufacturers face strict regulatory requirements when selecting materials for products that come into direct or indirect contact with the human body. Among the most important considerations is biocompatibility, which helps ensure that materials perform safely without causing harmful biological responses. For adhesives used in medical devices, compliance with ISO 10993 is often a critical requirement.

Whether bonding catheters, wearable sensors, diagnostic equipment, or implantable components, understanding ISO 10993 can help engineers select adhesives that support regulatory approval while delivering reliable performance.

What is ISO 10993?

Iso 10993 picture1

ISO 10993 is an internationally recognized series of standards for evaluating the biological safety of medical devices. Rather than certifying individual materials, the standard establishes testing methods that assess how a finished medical device interacts with the human body based on its intended use.

Because adhesives often become an integral part of a finished medical device, manufacturers frequently seek adhesive products that have been tested to relevant portions of ISO 10993. This testing provides valuable information during the device validation process and can reduce the amount of additional biological testing required.

The specific tests required depend on several factors, including:

Type of body contact
Duration of contact
Whether the device contacts skin, tissue, blood, or bone
Whether the device is temporary or permanently implanted

Common ISO 10993 Tests for Adhesives

Not every adhesive requires every test within the ISO 10993 series. The most commonly referenced evaluations for medical adhesives include:

Cytotoxicity (ISO 10993-5)

Cytotoxicity testing evaluates whether an adhesive causes toxic effects on cultured cells. This is often considered the first biological screening test for materials intended for medical use.

Citotoxycity test

Sensitization (ISO 10993-10)

Sensitization testing determines whether repeated exposure to the adhesive could trigger an allergic reaction in patients.

Irritation Testing (ISO 10993-23)

This testing evaluates whether the adhesive causes localized irritation when it comes into contact with skin or other tissues.

Systemic Toxicity

Depending on the intended application, testing may evaluate whether chemicals released from the adhesive could produce harmful effects throughout the body.

Additional Testing

Implantable devices or long-term contact applications may require further evaluations such as:

Genotoxicity
Hemocompatibility
Implantation studies
Chemical characterization
Material-mediated pyrogenicity

The testing strategy is determined through a biological risk assessment based on the device’s intended clinical use.

Why Adhesive Selection Matters

Selecting an adhesive that has already undergone ISO 10993 testing can significantly streamline product development. While adhesive testing alone does not eliminate the need to evaluate the complete medical device, it provides valuable supporting data for regulatory submissions.

Medical-grade adhesives are designed to provide more than just biocompatibility. They must also maintain consistent mechanical and environmental performance throughout the device’s service life.

Engineers often require adhesives that provide:

High bond strength
Low shrinkage during cure
Excellent chemical resistance
Sterilization compatibility
Low outgassing
Reliable long-term durability

Balancing these performance characteristics with biological safety is essential for successful medical device design.

Types of ISO 10993-Tested Adhesives

Several adhesive chemistries are commonly available with ISO 10993 testing.

Epoxy adhesives provide exceptional mechanical strength, chemical resistance, and dimensional stability, making them suitable for diagnostic equipment, surgical instruments, and electronic medical devices.

UV-curable adhesives offer extremely fast curing speeds, making them ideal for high-volume production of disposable medical devices, optical assemblies, and catheter bonding.

Silicone adhesives provide flexibility, excellent temperature resistance, and soft bonding characteristics that are well suited for wearable and implantable devices.

Urethane adhesives offer toughness and flexibility for applications that experience vibration or repeated mechanical stress.

The optimal adhesive depends on the application’s performance requirements, manufacturing process, and regulatory considerations.

Beyond ISO 10993

Although ISO 10993 is one of the most recognized standards for biological evaluation, medical device manufacturers should also consider additional regulatory requirements. These may include USP Class VI testing, sterilization compatibility, FDA regulations, and quality systems such as ISO 13485.

Working with an adhesive supplier experienced in medical applications can help simplify material selection and provide the technical documentation needed during product development.

Final Thoughts

ISO 10993 plays a vital role in the development of safe and effective medical devices. Choosing adhesives that have been evaluated according to relevant portions of the standard helps manufacturers reduce development risk while supporting regulatory compliance.

When selecting a medical adhesive, engineers should evaluate not only biocompatibility data but also mechanical performance, environmental resistance, sterilization compatibility, and manufacturing requirements. By considering both regulatory and engineering factors early in the design process, manufacturers can improve product reliability and accelerate the path to commercialization.

ISO 10993 Adhesives: Understanding Biocompatibility Requirements for Medical Device Bonding