A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/113
A61B 17/32 (2006.01) B26F 1/32 (2006.01) A61B 17/11 (2006.01)
Patent
CA 1129292
ABSTRACT A disposable aortic perforator has an elongated stem with an exterior stem surface circular-cylindrical about a longitudinal axis and extending between a far end and a near end. A coaxial disc having an exterior circum- ferential cylindrical disc surface of a first predetermined diameter is separated from the remainder of the stem by an intervening groove leaving an axial shank therebetween. The coaxial disc has a near surface on said disc normal to the axis and meeting the disc peripheral surface substantially at a right angle to form an abrupt outside corner. An elongated tube is telescoped over the stem and is slidable a predetermined distance, about one-third of an inch, in the stem. The tube has an interior, circumferential cylindrical or tube surface of a second predetermined diameter about .0002 inches larger than the first predetermined diameter of the stem. An annular surface at the far end of the tube and normal to the axis meets the interior tube surface sub- stantially at a right angle and forms an abrupt inside corner. A cross bar normal to the axis engages the stem and prefer- ably is disposed in a jacket slidable on or with respect to the tube. A spring is interposed between the stem and the tube for urging the tube axially away from the disc, the motion being limited by interengagement of slots in the tube with the cross bar.
316145
Downie David E.
Harvey Robert J.
Rueff John R.
Smart & Biggar
Thoratec Laboratories Corporation
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