Medical safety injector

Abstract

A medical safety injector comprises an injection needle assembly, an automatic needle tip recycling device and an injector. The medical safety injector is characterized in that a draw bar, a spring and a front plug are serially connected rotationally and are mounted in an inner cavity of a push rod, the front plug is fastened in an inner hole at the front end of the push rod, and the draw bar penetrates through a side seam of the push rod and is suspended in a slit of a side wall of a handle of an outer barrel. During injection, the push rod is pressed to drive the front plug to move, so that the spring can be lengthened; after the injection is completed, the push rod is pressed again, the annular wall of the front end of the push rod drives a damping ring to move forwards, an embedded needle base is released, an expansion portion of the front plug is simultaneously embedded with an annular bump of an inner hole of the needle base, the front plug under pressure is released from a limitation effect of the inner hole at the front end of the push rod, the spring retracts to drive the front plug, the needle base and the needle tip to return the inner cavity of the push rod, and an injection needle is completely shielded and cannot be released or exposed due to the fact that the total length of the draw bar, the spring, the front plug, the needle base and a needle tube is smaller than the length of the inner cavity of the push rod; as a dovetail narrow portion of a slit at the rear end of the push rod penetrates through a transverse bump of the draw bar, the push rod is limited at the corresponding position and cannot be pulled out again; and the needle base is destroyed, so that the injector is prevented from being reused. Owing to the fact that the needle base is structurally separated from the automatic needle tip recycling device, the injection needle of the medical safety injector can be replaced as needed before the medical safety injector is used, so that the medical safety injector brings convenience for clinical use.

Description

(1) Technical field [0001] The invention relates to a medical device, in particular to a medical safety injector used for puncturing human tissue and administering medicine to the tissue or extracting tissue samples after puncturing. (two), background technology [0002] Since the emergence of plastic disposable sterile syringes in the 1940s, because they cannot be restricted from being reused, a large number of blood-borne diseases have spread, especially AIDS, hepatitis C, and hepatitis B; 1994 The World Health Organization (WHO) advocated the use of "single-use self-destructing syringes", and technicians and companies have done a lot of exploration on how to prevent and prohibit the reuse of syringes; however, due to the fundamental cause of the spread of blood-borne diseases The reason is that the injection needle punctures or punctures medical staff and patients (cross-use injection needles) during the medical process, not the syringe itself; therefore, WHO re-proposed ...

AI Technical Summary

Problems solved by technology

[0006] 2. The method of automatically recovering the injection needle by the spring: the structure that the spring is set on the periphery of the needle seat (the mainstream spring front scheme at home and abroad) makes the recovery device and the (injection needle) needle seat an integrated structure. Once the syringe leaves the factory, it will The needle cannot be replaced again, and the requirements for the injection needle are also different in different clinical use environments, which brings inconvenience to the user; in addition: since the injection needle cannot be replaced, this syringe cannot be used in an emergency such as a first aid environment When collecting blood samples, it is easy to draw blood due to the existence of the blood coagulation mechanism, but when transferring the samples to the test tube, the blood has already activated the coagulation mechanism. A large number of broken blood cells make the test results biased and distorted

[0007] Chinese patent: CN92109192.3 announced "a safety syringe for one-time use". Its technical feature is the structure of recovering needles that are separated from the needle seat by a compression spring. Engagement to achieve the locking of the syringe push rod and the activation of the safety feature. Now, the scheme has not been well implemented, because the elastic piston is mainly a seal, and it is really difficult for it to undertake the fitting trigger and limit fixing. The inventor has not been able to realize it well

[0008] Chinese patent: CN200710031083.0 (and related similar technical solutions) discloses a method in which a front plug is provided at the front end of the inner cavity of the push rod and a compression spring is placed on the outer surface. The basic technical features are the same as the above, with certain improvements, and the needle can be replaced , but the disadvantage is that the needle tip edge cannot be fixed, and it is in any state

[0010] At present, there is no technical solution for medical safety syringes that can completely solve the above-mentioned deficiencies at home and abroad.

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