A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/83
A61M 5/00 (2006.01) A61B 5/15 (2006.01) A61M 5/34 (2006.01)
Patent
CA 1166538
Abstract of Disclosure: A blood extraction device has a cylindrical extraction tube with a piston movable in an air-tight manner within the tube. A closure cap carries a projection at the front end of the tube and a tubular guide sleeve which can be pushed onto the extraction tube. At its front end, the guide sleeve carries a double cannula having front and rear ends provided with respective cutting edges. A closure plug, puncturable by the rear end of the double-ended cannula, is arranged in the projection. In operation the front end of the cannula is inserted into a vein and the guide sleeve is moved onto the projection so that the rear end of the cannula punctures first of all a thin hose and then the closure plug. One or more retaining lugs provided on the side wall of the projec- tion cooperate with one or more axial slots provided in the guide sleeve to prevent rotation of the rear cutting edge of the cannula relative to the rubber hose and the closure plug as it moves through these components which could otherwise destroy the self-sealing properties of these components that are required on removal of the cannula. After the cannula has penetrated the closure plug, the guide sleeve can be rotated relative to the projection so that the retaining lug or lugs enter into lateral recesses at the front ends of the slots thus preventing axial separation of the guide sleeve and the extraction tube. In this position the resilience of the rubber hose acts to secure the twist actuated locking mechanism formed by the retaining lugs and the recesses at the ends of the axial slots.
393413
Swabey Ogilvy Renault
Walter Sarstedt Kunststoff-Spritzgusswerk
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