| http://www.w3.org/ns/prov#value | - The introducer, in its simplest form, can consist of a hollow needle-like device (optionally fitted with an internal removable obturator or trocar to prevent clogging during initial insertion, depending on its shape and other functions) or a combination of a simple exterior cannula that fits around a trocar, with the result being essentially the same: placement of a hollow tube (the needle or exte
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