Surgery – Truss – Pad
Patent
1990-10-30
1992-02-25
Hindenburg, Max
Surgery
Truss
Pad
128766, A61B 500
Patent
active
050904205
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an equipment for blood sample collection, i.e. an equipment comprising a hypodermic needle and a needle holder, which also includes a receiver cylinder for an evacuated vial. This vial has a perforatable end cap which at the insertion of the vial into the holder is perforated by an interior needle therein, such that hereby a suction connection is established between the specimen vial and the outer sampling needle. In so doing the collection of blood will be supported by the vacuum in the specimen vial, such that advantageously essentially thinner sampling needles than in the conventional, so-called open systems may be used.
When using such a closed system it is customary that in connection with the said holder a needle is used having a holding piece which can be connected to a stub on the holder and which has a two-sided protruding needle which is pointed at both ends and constitutes both the sampling needle and the associated inner needle in the holder for cooperation with the specimen vial. However, various problems are connected with this simple design, among others that the twin needles concerned are dangerous to handle. They are also problematic in those cases where it is relevant to fill more vials from one and the same insertion of the sampling needle, as in the intermediary periods blood may freely seep from the needle. This, however, is sought counteracted by using a resilient lining tube on the inner needle, this tube in its free state covering an outer, radial outlet opening in the needle, while the tube is axially pressed together for exposure of this opening by insertion of the needle through the end cap of the specimen vial, but the corresponding closing of the opening at the withdrawal of the vial is not fully effective.
DESCRIPTION OF THE PRIOR ART
According to the U.S. Pat. Nos. 4,166,450 and 4,312,362 sampling devices have been contrived where a separation is introduced between the outer, fixed or loose sampling needle and the inwardly projecting needle for connection to the vial, in that an intermediate chamber is provided with transparent walls, which are claimed to provide a visual indication that the sampling needle upon insertion has hit a blood vein such that connecting the vial may wait until it has been ascertained that the sampling will succeed. This may well cut back on certain abortive sampling attempts and a futile use of a number of vials, but in practice this problem is not abundant.
It is more significant that at the same time the environmental problem regarding use of double projecting needles is solved, viz. by the inner needle of the holder constituting a separate portion which both before and after use is situated connected to and protected by the surrounding holder, which does not appear to be recognized previously as a particular advantage on its own.
Comparing the said patent specifications it has been found natural that in the said discontinuous connection between the inner and outer needle, special valve portions may be used instead of the said resilient covering tube over the inner needle. One of the specifications (4,312,362) discloses that a valve slide is brought to uncovering a hole at the side of the inner end of the interior needle in response to the vacuum which is applied by the connection of the vial, but this construction will hereby be limited to a one-off use for filling of a single vial only, as no means are present for resetting the valve slide.
In the other of the said USA Patent specifications, viz. U.S. Pat. No. 4,166,450, an application of an inner needle is proposed, which is limited displaceable in a tight guide in such a manner that at the insertion of the vial into the holder, it is caused to be moved forward to perforating a thin separator diaphram adjacent an antechamber, which is connected to the rear end of the sampling needle, prior to the opposite end of same needle by the insertion of the vial penetrating the thicker end cap of the vial. This necessitates that the thus di
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patent: 4418703 (1983-12-01), Hoch et al.
patent: 4436098 (1984-03-01), Kaufman
patent: 4445896 (1984-05-01), Gianturco
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