US 4,216,776 AGranted

Disposable aortic perforator

AssigneeThoratec Laboratories Corporation

InventorsDavid E. Downie, Robert J. Harvey, John R. Rueff

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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 circumferential 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 a blunt outside corner that is a non-cutting edge. An elongated tube is telescoped over the stem and is slidable a predetermined distance, about one-third of an inch, on the stem. The tube has an interior, circumferential cylindrical or tube surface of a second predetermined diameter about 0.0002 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 substantially at a right angle and forms a blunt inside corner that is a non-cutting edge. A cross bar normal to the axis engages the stem and preferably 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.

Claims8

Dependent claims

A disposable aortic perforator comprising an elongated stem having 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, circumferential cylindrical disc surface of a first predetermined diameter;
means defining a near surface on said disc normal to said axis and meeting said cylindrical disc surface substantially at a right angle forming an outside corner supportive of a length of adventitia disposed substantially in a right-angle configuration abutting against said near surface and said disc surface;
an axial shank connecting said disc and said far end of said stem;
and elongated tube telescoped over and axially movable on said stem, said tube having an interior, circumferential cylindrical tube surface disposed to telescope over said exterior cylindrical disc and of a second predetermined diameter slightly larger than said first predetermined diameter and defining an annular clearance space of predetermined radial dimension at least as great as the thickness of a length of said adventitia disposed between said interior tube surface and said exterior disc surface;
means defining an annular surface on said far end of said tube normal to said axis and meeting said interior tube surface surface substantially at a right angle and forming an inside corner supportive of said length of adventitia disposed substantially in a right-angle configuration abutting against said annular surface and said interior tube surface;
a cross bar normal to said axis, means for fixing said cross bar in said stem;
a spring for urging said tube axially away from said disc;
and means for limiting axial movement of said tube relative to said stem.

5 more elements

Dependencies are inferred from the claim text.