Focusing on internal functions, there are two categories to distinguish pinless connectors: simple and complex. Simple pinless connectors account for the majority of pinless connectors.
Simple needle-free devices do not contain moving internal parts. On the other hand, a complex connector not only involves the movement of internal moving parts, but also depends on the movement of internal moving parts to allow the fluid to move successfully.
The movement of the fluid is the characteristic of the evaluation of the needleless connector. Manufacturers usually describe fluid movement as positive, negative, or neutral. Negative movement is where blood is drawn back into the catheter. Forward movement means holding 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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