What makes EPTFE non-degradable by the human body?

• A. Lack of oxygen exposure
• B. Body has no enzyme to break down C-F bond
• C. Its large molecular size
• D. It is chemically inert

Answer: (B)

The reason that ePTFE (expanded polytetrafluoroethylene) is considered non-degradable by the human body primarily relates to the absence of enzymes capable of breaking down the carbon-fluorine (C-F) bonds that are integral to its structure. These C-F bonds are exceptionally strong and stable, making them resistant to chemical degradation.

The human body utilizes various enzymes to metabolize and break down many types of biomolecules; however, it lacks the necessary enzymatic pathways to effectively interact with or cleave the strong carbon-fluorine bonds present in ePTFE. This absence of enzymatic activity leads to the persistence of ePTFE in the body when implanted, as it does not undergo degradation like many synthetic or biological materials.

While other factors may contribute to the overall inert nature of ePTFE, such as its large molecular size and chemical inertness, the key point regarding non-degradability directly stems from the inability of the human body to enzymatically process the material.