Needle-free infusion joints can be divided into positive pressure joints, negative pressure joints and balanced pressure joints according to their functions. This involves the direction of the liquid in the device.
Needleless infusion fittings are often associated with the word "pressure"; in fact, no pressure or external force is applied to the liquid as it flows.
The key is only the direction of liquid movement in the infusion connector and the catheter connected to it.
This is closely related to the operation methods of nurses in clinical use.
A positive pressure needleless infusion connector prevents blood from remaining in the catheter after the device is removed. When the infusion set is separated from the nipple and the connector after the infusion, instantaneous positive pressure can be generated, and the liquid in the connecting tube is automatically advanced forward, so that the cavity of the indwelling needle is filled with liquid.
Positive pressure fittings generate a disposable positive pressure when the infusion set or syringe is removed.
Positive disposable pressure can only prevent blood from remaining in the catheter after the device is removed. It only works when the infusion device or syringe is removed.
The amount of return blood in the catheter lumen depends on many factors, such as the size of the catheter lumen, the thickness of the vein, the venous blood pressure, and changes in chest pressure due to coughing, vomiting or sneezing.
Experimental method: Use red ink to replace the liquid during infusion for easy observation. Connect the positive pressure infusion connector to the catheter, use the syringe to suck the colored liquid and inject it into the catheter. After disconnecting the syringe from the infusion connector without clamping the tube clamp, the liquid will move forward instantly. This is a one-time positive pressure. The effect produced by the joint. After disconnection, the tube clamp must also be closed to ensure that blood is not returned by external forces.
Then the same can be obtained for the negative pressure joint, that is, the moment the connection is disconnected, the liquid moves in the opposite direction to the positive pressure joint, that is, the liquid flows back.
Experimental method: Use red ink to replace the 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 from the infusion connector without clamping the tube clamp, the liquid instantly returns, which is commonly known as "blood return" in clinical practice. .
Yuhuan Shengjiu Mould Co., Ltd. has many years of experience in the production of needleless connectors for medical applications. Provides safe, fast, and simple needle-free injection field products for Needleless Injection Site . Welcome to buy: https://www.medicalmould.net/product/
Needleless infusion fittings are often associated with the word "pressure"; in fact, no pressure or external force is applied to the liquid as it flows.
The key is only the direction of liquid movement in the infusion connector and the catheter connected to it.
This is closely related to the operation methods of nurses in clinical use.
A positive pressure needleless infusion connector prevents blood from remaining in the catheter after the device is removed. When the infusion set is separated from the nipple and the connector after the infusion, instantaneous positive pressure can be generated, and the liquid in the connecting tube is automatically advanced forward, so that the cavity of the indwelling needle is filled with liquid.
Positive pressure fittings generate a disposable positive pressure when the infusion set or syringe is removed.
Positive disposable pressure can only prevent blood from remaining in the catheter after the device is removed. It only works when the infusion device or syringe is removed.
The amount of return blood in the catheter lumen depends on many factors, such as the size of the catheter lumen, the thickness of the vein, the venous blood pressure, and changes in chest pressure due to coughing, vomiting or sneezing.
Experimental method: Use red ink to replace the liquid during infusion for easy observation. Connect the positive pressure infusion connector to the catheter, use the syringe to suck the colored liquid and inject it into the catheter. After disconnecting the syringe from the infusion connector without clamping the tube clamp, the liquid will move forward instantly. This is a one-time positive pressure. The effect produced by the joint. After disconnection, the tube clamp must also be closed to ensure that blood is not returned by external forces.
Then the same can be obtained for the negative pressure joint, that is, the moment the connection is disconnected, the liquid moves in the opposite direction to the positive pressure joint, that is, the liquid flows back.
Experimental method: Use red ink to replace the 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 from the infusion connector without clamping the tube clamp, the liquid instantly returns, which is commonly known as "blood return" in clinical practice. .
Yuhuan Shengjiu Mould Co., Ltd. has many years of experience in the production of needleless connectors for medical applications. Provides safe, fast, and simple needle-free injection field products for Needleless Injection Site . Welcome to buy: https://www.medicalmould.net/product/
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