Views:1 Author:Site Editor Publish Time: 2021-07-31 Origin:Site
After use, the needle can be retracted into the needle cylinder or cylindrical push rod to realize the safety protection function of the needle tip. This is the largest type of safety syringe at present, and its structure is relatively simple, and the production cost is relatively low. However, there are many parts in contact with the liquid medicine, and the friction and squeezing between the relevant parts that realize the safety function activation often occur in the liquid medicine. Therefore, how to reduce the "static" and "moving" pollution of the liquid medicine? One of the key issues that should be solved in the design and manufacture of such safety syringes.
The syringe manufacturer said that this type of safety syringe is divided into two types: "manual" and "automatic":
Manual retractable safety syringe: After injection, the needle is connected to the push rod as a whole, and the rod is manually pulled back, that is, the needle will be pulled into the barrel, thus realizing the safety protection of the pillow. In order to prevent the needle from sticking out of the barrel again, the needle deflection or two-way locking scheme is generally adopted. The latter has higher protection stability. Due to the low manufacturing cost of this type of safety syringe, it will become the main product in the low-end market of safety syringes, and it will also be the main variety for the promotion of safety syringes in developing countries. Taiwan has a number of patents and products for this type of safety syringe.
Automatic retractable safety syringe: At the end of the injection, the safety mechanism is activated, so that the needle will quickly fall back into the hollow plunger under the action of the pre-compressed spring. This type of syringe is the simplest to use and operate, but the production cost is relatively high due to the relatively complex structure and high precision of parts. In addition, its relationship with clinical use requirements is a two-way adaptation process.