Introduction of medical peristaltic pump catheter assembly

Structural composition

Catheter body: usually made of polymer materials such as silicone, polyurethane, and fluororubber. It has good flexibility, wear resistance, corrosion resistance, and biocompatibility to ensure that it will not cause harm to the human body when transporting fluids such as liquid medicine and blood, nor will it be corroded by the fluid or affect the properties of the fluid. Its inner diameter and wall thickness have various specifications according to different usage scenarios and flow requirements, such as inner diameters ranging from 1mm to 10mm.

Connecting parts: including various connectors, buckles, etc., used to connect the catheter body with other medical equipment such as peristaltic pumps, syringes, infusion bottles, nebulizers, etc., to ensure a firm connection and good sealing to prevent fluid leakage. For example, the Luer connector can be divided into a Luer inner connector and a Luer outer connector, which can be closely matched with the corresponding equipment.

Fixing device: such as a tube clamp, a holder, etc., used to fix the catheter to the peristaltic pump to prevent the catheter from shifting, shaking or falling off during the operation of the peristaltic pump, and to ensure that the peristaltic pump's extrusion and delivery of the catheter is stable. Some tube clamps are made of elastic materials and can adapt to catheters of different diameters.

Working Principle

The medical peristaltic pump drives the roller to rotate through the motor to alternately squeeze and release the catheter. When the roller squeezes the catheter, the liquid in the catheter is pushed forward; after the roller leaves, the catheter returns to its original state due to its own elasticity, forming a negative pressure in the catheter, thereby sucking in the upstream liquid, and so on. The cycle is repeated to achieve directional flow of the liquid, and the flow rate and flow rate can be accurately controlled.

Performance Requirements

Accuracy requirements: It is necessary to meet the requirements for fluid delivery accuracy in different medical scenarios. For example, in the delivery of chemotherapy drugs, accurate flow control is crucial, and the error is usually controlled within ±5% to ensure the accuracy of the patient's medication dosage.

Corrosion resistance: It must be able to withstand corrosion from various liquid medicines, blood, disinfectants, etc., to ensure that the performance of the catheter does not change during long-term use, and that cracks and ruptures will not occur due to corrosion.

Biocompatibility: When in contact with human tissues, blood, etc., it will not cause adverse reactions such as allergies, inflammation, coagulation, etc., and it complies with relevant biosafety standards, such as ISO 10993 biocompatibility test standards.

Sealing: Each connection part of the catheter assembly must have good sealing to prevent liquid leakage, avoid drug waste, environmental pollution, and harm to patients.

Application areas

Drug delivery: used for intravenous infusion, enteral nutrition delivery, chemotherapy drug injection, etc., can accurately control the delivery speed and dosage of drugs, ensure that the drugs are delivered to the patient on time and in the right amount, and improve the treatment effect.

Blood processing: In the process of hemodialysis, plasma separation, etc., it is used to transport blood and dialysate. The catheter assembly is required to have good biocompatibility and anticoagulant properties to ensure the safety and stability of blood during the delivery process.

Laboratory application: In medical laboratories, it is used to mix, separate and transport various liquid samples, such as cell culture fluid, reagents, etc., which helps to improve the accuracy and repeatability of experiments.