Injector capable of retracting needle automatically

Abstract

The invention belongs to the field of medical injector, and specially relates to an injector capable of retracting the needle automatically, which comprises a needle barrel, a needle, a push-rod handle and a push-rod body. A piston sealed with an inner wall of the needle barrel is sleeved on the outer circumference at the upper end of the push-rod handle. The push-rod handle is provided on the lower end. The push rod is in a hollow structure. An annular convex shoulder converging inwards is formed on the upper end of the push-rod body. A chuck is disposed on the annular convex shoulder. A blind hole with an opening upward is arranged in the middle of the upper portion of the chuck. An annular concave slot is provided in the middle of the chuck and disposed in the inner cavity of the push-rod body. A spring capable for completely pulling the chuck into the inner cavity of the push-rod body is disposed in the inner cavity of the push-rod body. When the push-rod body is pushed to the bottom of the matched injector needle barrel, the needle of the injector abuts against the chuck, and the upper portion of the chuck is inserted into an end portion of the needle far away from a tip of the needle. The invention is simple in structure, convenient for use, low in cost, easy for large scale production, and suitable for the injector capable of retracting the needle automatically.

Description

Technical field: [0001] The invention belongs to the technical field of medical syringes, in particular to a syringe that can automatically retract a needle. Background technique: [0002] At present, the medical level of various countries is improving day by day, and people pay more and more attention to the hygiene of medical supplies. For a long time, there have been cases of infection in the process of medical treatment. Whether it is medical staff or patients, the transmission route is nothing more than direct infection or indirect infection. Among them, most of the indirect infection is due to the The use of medical equipment is not clean, such as: incomplete disinfection, or reusing items that should be discarded, etc. Take syringes as an example: syringes are one of the most frequently used medical equipment in clinical practice. For medical devices that are in direct contact with patients, the most traditional form of syringe is to be reused after being sterilized ...

AI Technical Summary

Problems solved by technology

For a long time, there have been cases of infection in the process of medical treatment. Whether it is medical staff or patients, the transmission route is nothing more than direct infection or indirect infection. Among them, most of the indirect infection is due to the The use of medical equipment is not clean, such as: incomplete disinfection, or reusing items that should be discarded, etc. Take syringes as an example: syringes are one of the most frequently used medical equipment in clinical practice. For medical devices that are in direct contact with patients, the most traditional form of syringe is to be reused after being sterilized after use. However, if there is a lack of disinfection, it will lead to improper infection of patients. Therefore, this syringe has been used Restricted use or phased out; in response to the above problems, a disposable syringe has appeared, which will be discarded after one use, but if it is not thoroughly disposed of, it will create conditions for criminals and lead to reuse For example, some medical units discard the needle part after using it for the patient, and continue to use the syringe part. This is a very dangerous behavior. Although the syringe part does not directly contact the patient, due to the injection process, However, the patient's blood may flow back into the syringe, which may also bring germs into the syringe. When the next patient wants to use the same syringe to inject medicine, the germs may enter this patient along with the medicine. In the body of the patient, it has caused a great hidden danger of infection to the patient, causing damage to the patient's own rights and interests, and even endangering the life of the patient. Moreover, when this type of syringe is discarded after use, there is no protective treatment, which may easily injure the medical staff or others by mistake. Cleaning staff, etc., causing another undue infection and hazard

Now, the retractable self-destructing syringes developed for disposable syringes on the market all bring great difficulties to processing due to complex or unreasonable structures, so they cannot be mass-produced and cannot meet the needs of one-time use; at the same time The springs of retractable self-destructing syringes that appear on the market are all designed on the barrel and needle of the syringe, which is very easy to contaminate the parts in contact with the liquid medicine, affecting the safety of use

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