How does a self-aspirating syringe operate?

How does a self-aspirating syringe operate?

• A. When let off pressure it aspirates
• B. It aspirates continuously
• C. It aspirates only with rotation
• D. It never aspirates unless activated manually

Answer: (A)

The mechanism tested is how a self-aspirating syringe creates suction. In this design, the syringe has a built-in mechanism that generates negative pressure when you release pressure on the plunger. As you ease off the plunger after injecting, the internal valve/spring system pulls back slightly, drawing tissue fluid or blood into the syringe if the needle is in a vessel. That means aspiration happens automatically when you let go of the plunger, not while you’re actively pressing, and it isn’t a matter of rotating the syringe or requiring manual activation each time. So, the best description is that it aspirates when the pressure is released.

The mechanism tested is how a self-aspirating syringe creates suction. In this design, the syringe has a built-in mechanism that generates negative pressure when you release pressure on the plunger. As you ease off the plunger after injecting, the internal valve/spring system pulls back slightly, drawing tissue fluid or blood into the syringe if the needle is in a vessel. That means aspiration happens automatically when you let go of the plunger, not while you’re actively pressing, and it isn’t a matter of rotating the syringe or requiring manual activation each time. So, the best description is that it aspirates when the pressure is released.