| 摘要 |
For a single outlet vascular catheterism device a set of couplings are provided for the coupling of the elastic curved sleeve (7) on the cannula (2) of vascular catheter and on the serum cannula (10) in the opposite side, with three options of mechanical junctions as demonstrated according to the drawings and figures 4, 5, 6 and 7. Flat rings (4), compressed metal tubes (12) and plastic tubes (13) are used, superposing over the elastic curved sleeve (7). Gathered to two more options of sheltering device of the puncturing guiding needle, one is used by hand strength by holding the saliented wings in the front upper part of the device, that is helpful for the extraction of the puncturing guiding needle, as described in the figures 8, 9, 10, 11 and 12. The other sheltering device is automatic because of the articulation of the spiral spring, when the lock of the device is in operation, the puncturing guiding needle and the respective base is sheltered in the interior part of the spiral spring. This device is very advanced compared to conventional intravenous catheters that has the gauge close and open for total outgoing of the blood or a manual connection with the cannula's extensions of medicinal sera or the connection of lateral dosimeters in this delicate and improper area. Even though, the best option is in the device now presented, where the absence of blood extravasation problem is sure and keep the needle of the puncturing guiding needle safe through the automatic retraction. This device holds ideal set of connections that belongs to the most rigorous safe norms, avoiding thus possible accidents.
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