Is the bd infusion connector positive pressure or negative pressure?

Positive pressure.

1. The positive pressure connector can prevent air from the bd infusion connector from entering the body and reduce the risk of air embolism. Negative pressure fittings can allow air to enter the body, increasing the risk of air embolism.

2. The positive pressure connector can maintain pressure when using the bd infusion connector, making the infusion smoother. Negative pressure joints require manual operation to control the pressure and are cumbersome to use. Hence the positive pressure.