Blood extraction device
First Claim
1. A blood extraction device comprising a sample tubule (12) which is hermetically sealed at its rear end, a cannula (11), a front end (11'"'"') of which can be inserted into the vein (16) of a patient, an inner tube (14) extending into the interior of the sample tubule (12) and sealingly adjoining a rear end (11") of the cannula (11), so that the rear end (11") of the cannula (11) is in flow communication with the interior of the sample tubule (12), a front end of the sample tubule (12) being closed and including an air vent (13, 13'"'"', 13", 23);
- the inner tube (14) having an internal cross-section which is greater than an internal cross-section of the cannula (11) and sufficiently small so that during the taking of blood a continuous blood column (15) flows from the rear end (11") of the cannula (11) into the inner tube (14) while being retained inside the inner tube in all positions of the sample tubule (12) relative to the direction of gravity at least for as long as the cannula (11) is inserted into the vein (16);
the inner tube (14) further extending into a region of the sample tubule (12) at the rear end thereof; and
a cover (20) mounted on the front of the sample tubule (12), the inner tube (14) passing centrally through a bore (10) in the cover, an end of the inner tube proximate the cannula carrying a mounting element (17) projecting forwardly beyond the cover (20), and a rear end of the inner tube (14) extending to the vicinity of the rear end of the sample tubule (12).
1 Assignment
0 Petitions
Accused Products
Abstract
A blood extraction device has a cannula (11) the front end of which can be stuck into the vein of a patient and the rear end (11") of which stands in flow communication with the interior of a sample tubule (12) which is hermetically closed at its rear end (12") and is closed at its front end, apart from an air vent (13, 13'"'"'). An inner tube (14) extending into the interior of the sample tubule (12) sealingly adjoins the rear end (11'"'"') of the cannula (11) and has an internal cross-section such that during the taking of blood a continuous blood column (15) is pressed from the rear end (11") of the cannula (11) into the internal tube (14) and does not break away in any position of the sample tubule (12) relative to the direction of gravity, i.e. even when the tubule is arranged beneath the cannula (12), at least so long as the cannula (11) is inserted in the vein (16).
22 Citations
17 Claims
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1. A blood extraction device comprising a sample tubule (12) which is hermetically sealed at its rear end, a cannula (11), a front end (11'"'"') of which can be inserted into the vein (16) of a patient, an inner tube (14) extending into the interior of the sample tubule (12) and sealingly adjoining a rear end (11") of the cannula (11), so that the rear end (11") of the cannula (11) is in flow communication with the interior of the sample tubule (12), a front end of the sample tubule (12) being closed and including an air vent (13, 13'"'"', 13", 23);
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the inner tube (14) having an internal cross-section which is greater than an internal cross-section of the cannula (11) and sufficiently small so that during the taking of blood a continuous blood column (15) flows from the rear end (11") of the cannula (11) into the inner tube (14) while being retained inside the inner tube in all positions of the sample tubule (12) relative to the direction of gravity at least for as long as the cannula (11) is inserted into the vein (16); the inner tube (14) further extending into a region of the sample tubule (12) at the rear end thereof; and a cover (20) mounted on the front of the sample tubule (12), the inner tube (14) passing centrally through a bore (10) in the cover, an end of the inner tube proximate the cannula carrying a mounting element (17) projecting forwardly beyond the cover (20), and a rear end of the inner tube (14) extending to the vicinity of the rear end of the sample tubule (12). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification