Surgery – Truss – Pad
Patent
1988-01-14
1989-07-04
Howell, Kyle L.
Surgery
Truss
Pad
604205, 604239, 604264, A61B 500
Patent
active
048440892
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improved needle for multiple vacuum blood sample devices, of the type that pointed at both opposite ends to form two needles, fitted with relative covering elements, the first of which is designed to be introduced into the epidermis and vein, the second to be introduced into the closing stopper of a test tube, the needle in addition featuring, in what is substantially its central portion, an element for joining and retaining the covering element, and a threaded body, designed to engage in a corresponding hole centred in a test-tube carrying cylinder fitted with horizontally disposed tangs at either side to be gripped by the index and middle fingers of the user's hand.
As is well known in medical technique, blood samples for tests are taken using common syringes fitted with a hollow needle that draws the blood out of the vein.
Simple as these operations might seem when carried out by an expert, it is occasionally not so easy to introduce the needle without passing right through the vein, this making it necessary for the operation to be carried out again from the start.
The above happens as a result of the fact that the syringe will always take up a certain amount of space, obliging the operator to effect the injection and, above all, introduction into the vein, with a certain angle of incidence relative to the surface of the epidermis.
Syringes also exist that have an offset, or eccentric point for attachment needle: in such cases it is easier for the blood to be drawn out, but it can only be transferred to the test tube after the syringe has been withdrawn from the vein. However, more than one test will often be carried out, and it is thus necessary for several samples to be taken and divided between a similar number of test tubes. This forces one to use notably large syringes in order to take the necessary quantity of blood in one operation, and subsequently fill the single test tubes.
The problem of the angle of incidence of the needle, and that of taking multiple blood samples, are both solved by the use of a device composed of a test tube carrying cylinder, known as a holder, designed to receive vacuum test tubes, of a first needle, held at one end by a small pipe featuring two flexible diametrical tangs enabling it to be gripped by hand, and of a second needle, which can be connected to the other end of the small pipe by means of a LUER cone, and its point inserted in static fashion within the test tube holder. This second needle is fitted with a rubber cap that covers it. The test tubes are closed under vacuum with rubber stoppers that are less thick in their centre portion in order to facilitate their being pierced by the second needle. Using this device, it is possible to introduce the first needle into the vein, practically parallel to it, inasmuch as the space taken up by its diameter is almost negligible. It is then sufficient to place a test tube in the test tube carrying cylinder, pressing its stopper against the second needle which pierces it through the central zone of reduced thickness.
The full test can subsequently be replaced with another one without any problems, since the blood is retained by the cap of the second needle, which re-extends, completely covering the second needle, once the filled test tube has been removed.
A device constructed in this way reveals itself to be very practical in terms of ease of use, but has the disadvantage that there is a notable waste of valuable material -viz, the two needles, the LUER cone and small pipe, for every blood sample taken.
The greatest disadvantage, however, consists in the fact that the blood has to follow a long route from the vein to the test tube, with the possibility of minute clots being formed; these influence the results of the tests, above all in coagulationrelated tests such as the Quick time.
To eliminate these disadvantages, and above all that of the possible formation of small blod clots, consideration has been given to the use of double needles, that is to say,
REFERENCES:
patent: 3326206 (1967-06-01), Barr, Sr. et al.
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patent: 3494352 (1970-02-01), Russo et al.
patent: 3520292 (1970-07-01), Barr
patent: 4150666 (1979-04-01), Brush
patent: 4409990 (1983-10-01), Mileikowsky
patent: 4444203 (1984-04-01), Engelman
Howell Kyle L.
Sykes Angela D.
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