The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 1987
Filed:
May. 15, 1985
Geoffrey S Martin, Mississauga, CA;
Vas-Cath of Canada Limited, Mississauga, CA;
Abstract
A dual lumen cannula for use in haemodialysis has an improved leading end to facilitate insertion and an improved coupling for connection to blood extraction and return tubes. The improved leading end has a conical tip centered on the longitudinal axis of the cannula and, in the leading end, the extraction lumen is blanked off by using an insert to prevent blood flow downstream of the extraction lumen, and to minimize blood stagnation and damage. The improved coupling is generally Y-shaped and the extraction and return lumens of the cannula terminate in conical shaped ends which receive extraction and return tubes with similar shaped ends. The ends of the extraction and return tubes have minimal thickness so that when inserted the interior surfaces of the cannula lumens and the tubes merge smoothly to minimize blood impact problems. Methods of manufacturing the tip and a Y-shaped connecting piece for connecting the dual lumen cannula to tubing are also described.