Contracting rod syringe

Abstract

With references of a picture 2 and a picture 3, when a contracting rod syringe is pushed to the bottom, the other end of a stabbing rod 4 is backed up to be inserted into an inner cavity of a needle base 3. A top spring ring 14 presses spring top teeth 15 to contract toward the axle-center direction simultaneously, the spring energy of a spring 6 is released, and a press handle 21 is pushed to a tail hole 10 to be hooked and stumbled by tail hole teeth 11. Simultaneously, a core rod 2 is contracted backward to drive the needle base 3 and a needle tube 9 to be released from an inner cavity of an inner conical head 20 of an outer sleeve 1 and to be pushed into the outer sleeve 1. If the core rod 2 is pulled again, a retaining ring 21 is contacted with blocking teeth 17 so that the retaining ring 21 cannot be released, the contracting rod syringe cannot be used again, and the needle tube is protected at the first time after being used.

Description

Technical field: [0001] The invention relates to a medical injector, especially a retractable rod injector after injection is completed. Background technique: [0002] Various types of medical syringes commonly used at present achieve the effect of suction by pushing and pulling. However, after fulfilling the intended use requirements, there is the possibility of cross-contamination and reuse after disposal; it also includes the trouble of disposal; especially the needle tubes that come into contact with human blood, if accidentally punctured, there is obviously the possibility of infection. Although there are already safe syringes for needle retraction, the structure is not reasonable, and many designs do not consider the material properties and manufacturing characteristics of plastics, which increases the requirements for dimensional accuracy of plastic manufacturing processes and increases manufacturing troubles. Assembly also cannot be fully mechanized; especially smal...

AI Technical Summary

Problems solved by technology

However, after the expected use requirements are fulfilled, there is the possibility of cross-contamination and reuse after disposal; it also includes the trouble of disposal; especially the needle tubes that come into contact with human blood, if accidentally punctured, there is obviously the possibility of infection

Although there are already safe syringes for needle retraction, the structure is not reasonable, and many designs do not consider the material properties and manufacturing characteristics of plastics, which increases the requirements for dimensional accuracy of plastic manufacturing processes and increases manufacturing troubles. Assembly also cannot be fully mechanized; especially small gauge syringes cannot be retracted automatically

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