The genotoxicity test battery includes:

• test for gene mutation in bacteria by direct application or using device extracts as test item on 4 strains of Salmonella Thyphimurium and 1 strain of Escherichia Coli
• in vitro test for evaluation of chromosomal damage in mammalian cells. Chinese Hamster Ovary (CHO) or Chinese Hamster lung (V79) cells are generally used.
• in vitro Mouse Lymphoma Assay, modified for medical devices
• micronucleous test in rodents.

Effects on the first and second generation are assessed, taking into consideration the applicability to medical devices (route of application, extraction, exposure).

According to nature of test item one or more of the following tests can be chosen:

• extract test
•  direct contact test
•  indirect contact test.

Cytotoxicity can be measured by different methods that address different end-points:

• cell damage
• cell growth
• cell metabolism

Established cell lines from recognised repositories are suggested. The following cell lines are normally used:

• NCTC clone 929
•  Balb/3T3 clone A31
• MRC-5
• WI-38
• Vero
• BHK-21
• V-79

Implant studies are used to assess the local pathological effects on living tissues, as well as duration of the implant. Rodents are used in our facility.
Our scientists can help the customers to design an expanded study plan that includes the evaluation of both local and systemic effects to address the end-points of single- and repeated-dose toxicity studies.
The following route of application can be managed at our facility: intraarticular, intramuscular, intradermal, subcutaneous, intraosseous. Other routes, more relevant for human use, can be selected.

Skin irritation is performed in vitro, with the Reconstructed Human Epidermidis (RHE) model

Sensitization tests estimate the potential for contact sensitization by medical devices and their extracts.
The test method available at Galileo Research is the Local Lymph Node Assay (LLNA) that is internationally accepted as an alternative to the Guinea Pig Maximization test, in view of animal welfare considerations.

Absorbable medical devices that are intended to be implanted for longer than 30 days and can release potentially toxic substances during body contact, have to undergo specifically designed degradation studies. The assessment of degradation should consider the anatomical location and the biological environment. In vitro test systems that simulate the conditions of the clinical application should be developed and scientifically justified.
Galileo Research is able to plan and conduct in vitro or in vivo studies specifically designed for your device, developing models that take into account all processes that influence biodegradation (biochemical, mechanical,…), and also measuring leachables and degradation products.

Systemic toxicity studies are used to estimate the potential dangerous effects of the device when leachables and degradation products are absorbed systemically after single or repeated exposures (acute, subacute, subchronic, chronic toxicities). Protocol design for systemic toxicity studies is a critical phase and, according to ISO standards, it can be expanded in order to include implantation study and to determine systemic and local effects.

Toxicokinetic evaluations to determine the presence of leachables, degradation products and their metabolites can also be included in such protocols. Analytical methods have to be validated within the study plan.

Assessment of immunosuppression and/or immunostimulation can be included in the same studies, to get the first non-functional indications of such effects. More specific immune function assays can then be applied.