Biocompatibility and Toxicology

Biocompatibility & Toxicology

MDTL can assist in the development of data necessary to support the regulatory requirements of the Medical Device industry. ISO 10993 describes the general principles governing the biological evaluation of medical devices within a risk management process.  The ISO 10993 guideline is generally accepted worldwide.

Biological Evaluation According to ISO 10993

MDTL offers biological studies with accredited partner labs according to the matrix of ISO 10993-1 and can also create individual customized testing strategies. Evaluation depends on the category of the medical device in accordance with the nature of the devices' use pattern and the duration of contact.

Bridging Studies

MDTL also conducts bridging studies to determine scientific background for the biological evaluation of a medical device. These studies provide essential information for assessing risks and benefits as well as achieving the ethical conduct of the planned evaluation as required by the animal welfare regulation (i.e. ISO 10993-2). Biocompatibility is evaluated through expert reports based on material and literature data, along with actual study results.

Biocompatibility Tests

Cytotoxicity

  • Growth inhibition
  • Direct cell contact
  • Agar diffusion test
  • Colony forming assay

Hemocompatibility

In vitro assays

  • Static systems
  • Dynamic systems e.g., Chandler system

Biological endpoints

  • Thrombosis
  • Coagulation
  • Platelets
  • Homolysis
  • Complement system

Irritation

  • Dermal irritation
  • Intracutaneous irritation
  • Ocular irritation
  • Oral mucosa irritation test
  • Penile irritation test
  • Rectal irritation test
  • Vaginal irritation test

Functional Implantation Studies

Soft tissue

  • Application systems
  • Breast prostheses
  • Bone
  • Tissue replacement
  • Orthopaedic prostheses
  • Blood
  • Stents

Sensitization

  • Maximization test (Magnusson & Kligman)
  • Closed patch test (Buehler)
  • Local lymph node assay (LLNA)
  •  

Local Tolerance

Histocompatibility

  • Subcutaneous tissue
  • Muscle
  • Bone

Toxicity

  • Single dose toxicity
  • Repeated dose toxicity (subacute, subchronic and chronic)
  • Reproductive toxicity
  • Inhalation toxicity
  • Carcinogenicity in vivo

Genetic Toxicology

  • Genetic Toxicology using Prokaryotics
  • Ames test (OECD 471) Salmonella typhimurium, Escherichia coli
  • Genetic Toxicology using Eukaryotics
  • Chromosomal aberrations (OECD 473): V79 cells or human lymphocytes
  • Mouse lymphoma assay (OECD 476)
  • Hypoxanthine-guanine Phosphoribosyl Transferase assay (HPRT) (OECD 476)
  • Micronucleus assay in vitro (OECD 487)
  • Micronucleus assay in vivo (OECD 474)
  • DNA-repair: UDS assay in vitro / ex vivo (OECD 486): rat primary hepatocyte

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