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Needleless Injection Site -How To Use Needleless Connector

  • August 17, 2020 3:41 AM EDT

    Needleless infusion connectors can be divided into positive pressure connectors, negative pressure connectors and balanced pressure connectors according to their functions. This involves the direction of the liquid in the device.

     

    Needleless infusion connectors are often associated with the word "pressure"; in fact, when the liquid flows, no pressure or external force is applied to it.

    The key lies in the movement direction of the liquid in the infusion connector and the pipe connected to it.

    This is closely related to the operation technique of nurses during clinical use.

     

    The positive pressure needleless infusion connector can prevent blood from remaining in the catheter after the device is removed. After the infusion is completed, when the nipple of the infusion set is separated from the joint, an instant positive pressure can be generated, which automatically pushes the liquid in the connecting tube forward, so that the cavity of the indwelling needle is filled with liquid.

    The positive pressure connector generates a one-time positive pressure when the infusion device or syringe is removed.

    One-time positive pressure can only prevent blood from remaining in the catheter after the device is removed, and it will only work when the infusion device or syringe is removed.

    The amount of blood returning in the catheter lumen depends on many factors, such as catheter lumen size, vein thickness, venous blood pressure, and changes in chest pressure caused by coughing, vomiting, or sneezing.

    Experimental method: Use red ink instead of liquid during infusion for easy observation. Connect the positive pressure infusion connector to the catheter, suck the colored liquid with a syringe, and inject it into the catheter, disconnect the syringe from the infusion connector without clamping the tube clamp, and the liquid moves forward instantly. This is a one-time positive pressure The effect of the joint. After the connection is disconnected, the sealing tube clamp should also be clamped to ensure that it is not affected by external force to cause blood backflow.

    In the same way, the negative pressure joint can be obtained, that is, at the moment of disconnection, the direction of liquid movement is opposite to that of the positive pressure joint, that is, the liquid returns.

    Experimental method: Use red ink instead of liquid during infusion for easy observation. Connect the positive pressure infusion connector to the catheter, suck the colored liquid with a syringe, and inject it into the catheter. After disconnecting the syringe and the infusion connector without clamping the tube clamp, the liquid will flow back instantly, which is commonly known as "blood return" in clinical practice. .

    Have you noticed that before disconnecting the tube clamp, the liquid in the catheter does not flow back. This is the method of positive pressure tube sealing.

    Therefore, when the negative pressure joint is used, the liquid can be pushed out by the correct positive pressure method of clamping the pipe clamp.

    Regardless of the positive pressure and negative pressure connectors, follow the manufacturer's instructions to clamp the catheter and finally disconnect the syringe or infusion set in the correct order. The sequence of flushing, clamping and disconnecting the syringe depends on the type of connector.

     

    -Positive pressure connector: After flushing the catheter, disconnect the syringe or infusion set from the connector, and then clamp the sealing clamp;

     

    -Negative pressure connector: During the process of flushing the catheter, clamp the sealing tube clamp to maintain positive pressure, and then disconnect the syringe or infusion set.

     

    Standardizing the type of needleless infusion connector can reduce the risk of confusion and improve the results of use.


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