The barrel is open at both ends to receive a plunger at the plunger end and a needle at the opposite end.
2
柱塞 在完全压下的位置将针头座子从针筒的端部释放，真空将针头座子和 针头推入空心柱塞。
The plunger in the fully depressed position releases the needle carrier from the end of the barrel and the vacuum pulls the needle carrier and needle into the hollow plunger.
3
这样在针头就位于针筒内，不易被针头所刺伤，造成感染。
Accordingly, the syringe needle is arranged in the syringe, a user is not prone to be stabbed and infected.
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