| http://www.w3.org/ns/prov#value | - The combination of claim 5 in which the cannula is a radiopaque vinyl plastic and the catheter is at least partially radiopaque. t t t Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2024982 *19 Dec 193417 Dec 1935Harry C ScottSurgical instrumentUS2688329 *19 Mar 19537 Sep 1954American Cystoscope Makers IncCatheterUS2701559 *2 Aug 19518 Feb 1955Cooper William AApparatus for
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