摘要:
A sheath (10) is composed of a biocompatible material which has a stiffness and moldability for easy deformation by hand or by a guiding or shaping tool. It has a suppleness so it may be molded by its disposition within the body cavity within trauma to the tissues. It has sufficient stiffness and moldability such that it retains a shape which has been imparted to it by a shaping tool when in the body cavity. Once the shaping or forming tool has been removed, the sheath will tend to stay in its molded shape in the body cavity without generating a resilient force or displacement which returns it to its original shape. A medical instrument can than be telescopically disposed through the sheath and correctly delivered within the body cavity according to the molded shape imparted to the sheath by the shaping tool.