| http://www.w3.org/ns/prov#value | - Examples of suitable materials include thermosetting compositions such as epoxy glass composites and thermoplastics such as polyesters, polycarbonates and rigidized PVC. Although the rigid sheath of the present invention may be sterilized for reuse, an advantage of the rigid sheath is that it can be made relatively inexpensively and can, therefore, be economically disposed of after a single use, t
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