| http://www.w3.org/ns/prov#value | - A means for delivering the external retention member to desired position over said hollow flexible tube, having a leading end, a second end and a lumen opened at both ends of the means, can be constructed in any shape and configuration provided that at least at one of its end, such as a leading end, the means will be non-collapsible enough to provide, when positioned through said bore of the exter
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