A seal assembly establishes sealing engagement with a plurality of differently dimensioned instruments passing through a trocar. The seal assembly is a caged seal assembly movably disposed within the trocar and includes at least two seal segments disposable into and out of a sealing orientation relative to the instrument. A cage structure of the seal assembly includes at least two cage segments each connected to a seal segment, a biasing assembly connected to the cage structure and disposed and structured to normally bias the seal segments into sealing orientation.
