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US 5,222,502 AGranted
Blood collecting needle
AssigneeTerumo Kabushiki Kaisha
InventorKatsutoshi Kurose
Life of this patent
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Abstract
A blood collecting needle including a hollow cannula, both ends of which are sharp tips, and a hub for supporting the center portion thereof. The hub includes a sheath which is formed of an elastic body and fixedly mounted on the hub and which surrounds the cannula in a liquid sealed state projecting from the back section of the hub. The hub also includes an air passage connecting the space between the sheath and the cannula with outside air. Flashback can be reliably confirmed, for example, when the tip of the cannula pierces an intravenous vein.
Claims11
A blood collecting needle, comprising:
- a substantially cylindrical hub;
- a cannula extending from both ends of the hub in an axial direction of the hub, said cannula having sharp tips and an internal path that is continuous;
- and
- a cylindrical elastic sheath having a bottom fitted into the hub in a liquid sealed state in such a manner as to surround one of the extending ends of the cannula
- wherein the hub comprises:
- an axial communicating passage into which the cannula is inserted and fixed;
- an air passage connecting the internal cavity of the cylindrical elastic sheath with the outside atmosphere;
- a permeable filter, fixedly mounted on an outside mouth section of the air passage, having a small hole for permitting gases but not liquids to pass;
- and
- an air room having only one opening connected to a portion of the air passage.
7 more elements
Dependencies are inferred from the claim text.