History ● Formed in 1960s Used to treat poliomyelitis at that time (catgut implantation) ● From 1960s 1970s,more than 10 published papers were about poliomyelitisHistory Formed in 1960s Used to treat poliomyelitis at that time (catgut implantation) From 1960s – 1970s, more than 10 published papers were about poliomyelitis