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US 5,290,267 AGranted
Hypodermic needle
AssigneeFresenius AG
InventorMichael Zimmermann
Life of this patent
Estimating the term…
Abstract
The invention concerns a cannula comprising a cannula tube with a preferably rigid upper section, an end section which is bent laterally and a hook-shaped curved section which has in its concave side a tangentially inward ground lumen opening. The lumen opening has a sharply inwardly directed rear edge. This results in the advantage that during piercing of natural and synthetic walls the cutting of plugs from the material to be perforated is avoided.
Claims9
A cannula comprising:
- a cannula tube having a lumen therethrough, said cannula tube having an upper section at least a portion of which lies on a longitudinal axis of the cannula tube, an end section connected with the upper section and laterally disposed at an acute angle to the longitudinal axis of the cannula tube, and a hook-shaped curved section connected with the end section, the curved section terminating in a piercing part with a lumen opening therein, the lumen opening being tangentially ground into a concave side of the curved section and having, near the end section, a rear edge directed inwardly into the curved section.
Dependencies are inferred from the claim text.