What type of material are SIR Spheres primarily made from?

SIR Spheres are primarily made from a unique type of resin that falls into the category of polymeric materials. This is a subtype of plastic known for its biocompatibility and ability to deliver targeted radiation therapy effectively. The material used facilitates a consistent release of radiation while minimizing damage to surrounding healthy tissues, thus enhancing the efficacy of therapy for liver tumors.

The choice of a polymeric material over metals, ceramics, or glass is significant for ensuring the spheres can be effectively used in a vascular environment, as their size and surface properties have been optimized for safe and efficient delivery into the bloodstream. This design is crucial because it allows for the spheres to be injected through a catheter into hepatic arteries, where they can lodge within tumors and release radiation locally.

Understanding the material composition of medical devices like SIR Spheres is essential, as it directly impacts their functionality, safety, and interaction with biological tissues.