Once used syringe incapable of being reused

Abstract

The disposable injector capable of preventing is from rusing is technically characterized by that on the through hole of syringe a receiving hole is formed, and a blocking head is placed at correspondent position of through hole of syringe, when the pushing shaft is used to drive plunger piston and make it downwards move, the end face of bottom end of plunger piston can be used for pressing the blocking head until the blocking head is entered into the receiving hole, and at the same time the through hole can be completely closed so as to make said injector has no the function for conveying injection.

Description

Technical field: [0001] The invention relates to a syringe, especially a disposable syringe. Background technique: [0002] Syringes are commonly used medical equipment. In order to avoid cross-infection and other diseases that may occur during use of syringes, disposable syringes are now widely used. However, disposable syringes still have the problem of being reused intentionally or unintentionally. , which is extremely harmful. So there are various technical solutions to prevent disposable syringes from being reused: [0003] British patent GB-A-2015883, the push shaft and the plunger of this scheme are detachably connected, and an accessory is stretched near the bottom of the syringe, and the needle is installed at the bottom of the syringe. When in use, the plunger is on the push shaft. Push it down to the bottom of the syringe, and after a while, the protruding accessory will engage with the plunger; when it is used again, when the push shaft is pulled back from the ...

AI Technical Summary

Problems solved by technology

[0004] European patent EP-A-00229017 adopts a structure in which the forming head plunger and a set of flexible deformable fingertips of the corresponding shaft are engaged. When the plunger is pushed downward by the shaft, the forming head of the plunger will be deformed or broken. Engaged flexible fingertips, with which the fingertips are no longer engaged with the plunger, so that the plunger can no longer be pulled back from the bottom of the barrel to withdraw a new syringe, thereby preventing its re-use, however, the above-mentioned shaped tip plunger The structure of a set of fingers and a set of fingertips is very complicated, the manufacturing process requirements are also high, and its meshing work is not reliable

[0005] For this reason, Chinese patent ZL91100934.5 has suggested another improved scheme, and this scheme is to protrude a forming part toward the needle cylinder on the bottom wall of the syringe, and this forming part can be firmly connected with one and its complementary position. The movable part (plunger or push shaft) engages with the shaped part on the opposite surface. The patent has several engagement structure schemes, the common feature of which is that the fixed part (such as a syringe or needle) engages the movable part (plunger or push shaft), After the movable parts are engaged, they can no longer move, so that the syringe will fail. Therefore, it is necessary to ensure reliable and firm engagement. Therefore, the corresponding structure must be strengthened or the structure must be complicated, and its manufacturing process requirements are also high, and its cost is also high. greatly increased

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