Heat treatment apparatus for inactivating viruses in blood products includes a series of tubing coils with connectors at the opposite ends of the series for connecting the tubing to a blood product source and a blood product destination. In the optical fiber branch cable of the invention, in a middle of a multi-core optical fiber cable 2 of a trunk line, a branch portion 11 is disposed. The chamber is located between first and second layers of material. Following this, each of the element pattern types is corrected so as to prevent a plasma micro-loading effect. The epoxy resin composition of the invention and a molded product are halogen-free and antimony-free and are excellent in flame retardancy. Attached to the upper end of each rotating post is a perpendicularly aligned handle bracket.