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US 4,227,620 AGranted
Specimen collecting tube
AssigneeBecton, Dickinson and Company
InventorHugh T. Conway
Life of this patent
Estimating the term…
Abstract
A specimen collection tube for liquids such as blood having an internal surface adapted to mate with the bottom of a stopper is provided. By necking in the tube wall at a point which is generally coincident with an appropriately formed taper at the stopper bottom, blood or additives will not be entrapped at the junction. Slots or other openings which may be provided along the outside of the stopper wall are sealed off from the inside of the tube by the necked in portion.
Claims4
A specimen collection receptacle for liquids such as blood comprising:
- a tubular body having a closed end and an open end and a circumferential protruding portion extending interiorly from the tubular body between said closed and open ends, said protruding portion being formed by a necked-in part of the tubular body so that the interiorly protruding portion has a surface facing the open end angled toward the closed end;
- and a stopper sealing the open end of the tubular body, said stopper having a tapered bottom resting upon the protruding surface such that a smooth transition is formed between the exterior surface of said stopper and the interior surface of the tubular body.
Dependencies are inferred from the claim text.