Focusing on internal functions, there are two categories that can distinguish pinless connectors: simple and complex. Simple pinless connectors account for most of the pinless connectors.
The simple needle-free device contains no moving internal parts. On the other hand, a complex connector not only contains the movement of internal moving parts, but also depends on the movement of internal moving parts to successfully move the fluid.
The movement of the fluid is to characterize the needleless connector. Manufacturers often describe the motion of fluids as positive, negative, or neutral. Negative movement is where blood is drawn back into the catheter. Forward motion means keeping a small amount of fluid and then pushing it into the catheter when disconnected. Neutral motion prevents fluid from moving into the catheter.
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