What are the two types of lead insulators recognized in pacing?

The two types of lead insulators recognized in pacing are silicone and polyurethane. Silicone is widely used due to its biocompatibility, flexibility, and durability, which make it suitable for medical applications within the body. It provides an effective barrier against bodily fluids and helps maintain the integrity of the pacing lead over time.

Polyurethane is another commonly used insulator that offers high tensile strength, enhanced resistance to abrasion, and superior flexibility compared to other materials. It is also more resistant to the degradation that can occur over time within the biological environment. The combination of these two materials in pacing leads helps ensure that the leads can function effectively over an extended period while minimizing complications such as lead insulation failure or degradation.