Evaluating Systemic Impact

While local biocompatibility tests focus on the point of contact, Systemic Toxicity (ISO 10993-11) and Pyrogen Testing evaluate the potential adverse effects that may occur when substances from a medical device enter the systemic circulation and affect various organ systems.
 

1. Systemic Toxicity Testing

This evaluation identifies potential hazards resulting from the absorption and distribution of chemical constituents throughout the body.

• Acute Systemic Toxicity: Assesses immediate adverse effects (e.g., behavioral changes, tremors, or lethargy) within 24 hours of a single exposure.

• Sub-acute/Sub-chronic/Chronic Toxicity: Investigates the cumulative effects of repeated or long-term exposure on major organs like the liver, kidneys, and spleen, often involving clinical chemistry and hematology analysis.
   

2. Pyrogenicity Testing

A pyrogen is any substance that induces a febrile (fever) response. For devices in contact with blood or cerebrospinal fluid, ensuring they are "non-pyrogenic" is a critical safety requirement.

• Types of Pyrogens: These can be Endotoxins (derived from gram-negative bacteria) or Material-mediated pyrogens (chemicals inherent to the device material).

• Test Methodology: The Rabbit Pyrogen Test remains a standard for detecting overall pyrogenic responses. However, specialized tests like the LAL (Limulus Amebocyte Lysate) and MAT (Monocyte Activation Test) are increasingly used to quantify endotoxin levels and reduce animal usage.
  
  
  
  Click to Pay