16-04-2015 дата публикации
Номер: US20150105693A1
A disposable sterile retracting blood taking needle consists of an end cover, a protective sleeve, a needle guard, a needle, a needle hub, a core rod. An outer sleeve, a piston, a sheath and a blood taking needle. The piston is arranged in a clamping groove of the core rod; the outer sleeve is sleeved on the core rod and the piston; the piston and the outer sleeve are in interference fit; inner holes of the needle, the needle hub, the core rod and the blood taking needle are communicated; the core rod and the outer sleeve are made of transparent materials; blood backflow is judged by blood flowing in a passage in the core rod; and after blood taking is completed, a medical worker presses a blood taking position of the blood taking needle with one hand, presses the outer sleeve with a finger of the other hand and pulls the needle guard to move back with other fingers of the other hand, so that a snap ring of the core rod enters a slot of the outer sleeve and is locked, and the blood taking needle is hidden in a cylinder of the outer sleeve, and thus the aim of safety is fulfilled. 1. A disposable sterile retracting safe blood taking needle , which consists of an end cover , a protective sleeve , a needle guard , a needle , a needle hub , a core rod , an outer sleeve , a piston , a sheath and a blood taking needle , wherein the blood taking needle is arranged in a pinhole , glue is applied in a glue hole to tighten the connection between the blood taking needle and the core rod; a column is arranged in a cylinder of the piston , the two end faces of the piston are limited by an groove end face and another groove end face , the fit between the cylinder and the column is an interference fit; the piston is arranged in the front of the cylinder , the fit between a lug ring of the piston and the cylinder is an interference fit , the core rod is arranged inside the cylinder , the fit between the core rod and the outer sleeve is a transition fit , the fit between a snap ring ...
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