Piston for injector
A technology for syringes and pistons, which is applied in the field of pistons for medical syringes. It can solve the problems of reduced contact area between the sealing ring and the syringe sleeve, and reduced sealing performance, so as to avoid the reduction of sealing performance, prevent blood return, and enhance the use safety.
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[0012] like Figure 1-Figure 3 As shown, a piston for a syringe includes a piston top 1 and a piston main body 2, the piston main body 2 is a hollow cylinder with an opening at the bottom, the lower part of the hollow cylinder can be connected with the push rod of the syringe, and the upper part of the hollow cylinder is connected with the piston top 1. A piston shrinking cavity 21 is formed, and a sealing ring is provided outside the piston body. As a preferred method, three sealing rings are provided on the outer surface of the piston body. The first sealing ring 23 is located at the lowermost end of the piston body 2, and the third sealing ring is the top sealing Ring 25, the second sealing ring 24 is located between the first sealing ring 25 and the third sealing ring 23, the distance between the first sealing ring 23 and the sealing ring 25 at the top of the piston body is 1 / 2-3 / 4, the piston body 2 is a hollow cylinder There is a piston thread 22 inside the body. The pis...
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