布隆 | Central Venous & PICC Catheter Extrusion Line

一. Product Overview of Central Venous Catheters and Peripherally Inserted Central Catheters

Central venous catheters are important products in the field of interventional vascular consumables. Among them, the peripherally inserted central catheter (PICC) is a long-term infusion technique in which the catheter is inserted through a vein in the arm and its tip is positioned in the superior vena cava or a large thoracic vein. PICC catheters are soft and have good biocompatibility; they can remain indwelling in the body for a long period, with a maximum indwelling time of up to one year.

The main uses of PICC catheters include long-term drug infusion, oncologic chemotherapy, parenteral nutrition support, and long-term anti-infective therapy. Drug administration through a PICC can effectively protect superficial upper limb vessels from injury caused by irritating medicinal solutions. Because blood flow in the large thoracic veins is greater, drugs are diluted more rapidly, significantly reducing the risk of drug-induced irritation to small veins.

According to structural differences, central venous catheters can be classified as single-lumen, double-lumen, and triple-lumen catheters. Among these, double-lumen catheters used as central venous catheters for blood purification are currently widely used in clinical practice. Central venous catheters can also be used for central venous pressure measurement, intravenous infusion, hemodialysis, and the establishment of reliable infusion access.

Blesson Central Venous & PICC Catheter Extrusion Line

二. Core System Configuration of the Blesson Central Venous Catheter and PICC Extrusion Production Line

The Blesson central venous catheter and PICC extrusion production line is specifically developed and designed for high-precision extrusion molding of medical central venous catheters. It is compatible with PVC, TPU, PEBAX, and other medical-grade polymers and strictly complies with medical clean manufacturing standards. It integrates high-precision drive, sizing, 牵引, cutting, and closed-loop synchronized control technologies. It features high cleanliness, 稳定运行, and excellent molding precision, and can meet the stringent production requirements of central venous catheters for diameter accuracy, outer wall smoothness, and roundness. It is suitable for large-scale, stable production of central venous catheters in various specifications, including single-lumen and multi-lumen types.

（1）Blesson Main Machine Control and Direct-Drive Transmission System

• Control Unit: The entire Blesson machine is equipped with a Siemens touch control system and a high-definition industrial touchscreen. It supports production parameter presets, storage of multiple process recipes, real-time monitoring of operating status, and fault self-diagnosis. The operation is intuitive and convenient, enabling rapid switching of production parameters for catheters of different specifications and meeting the flexible production needs of multiple categories of medical catheters.
• Transmission Unit: The Blesson extruder adopts a maintenance-free motor-gearbox direct-drive transmission structure, eliminating traditional belt transmission. This fundamentally removes the risks of transmission dust and oil mist volatilization, meeting the dust-free production requirements of medical cleanrooms. It also provides higher transmission efficiency and lower operating noise. The fully maintenance-free design reduces equipment operation and maintenance costs and reduces unplanned production downtime.

（2）Blesson Medical-Grade Sizing and Cooling System

• Tank Structure: The Blesson sizing water bath is integrally bend-formed from SUS304 medical-grade stainless steel, with no spliced dead corners and easy cleaning and disinfection, fully complying with the hygiene control standards of medical production. It is equipped with a fully sealed glass cover to isolate external dust and microbial contamination, ensuring a clean closed-loop environment during sizing.
• Sizing Process: Blesson provides customers with a medical purified water supply pump, and purified water is used for cooling throughout the process, preventing impurities from adhering to the inner and outer walls of the catheter and reducing the risk of biological contamination. Combined with micro-negative-pressure water-ring sizing technology, it ensures uniform circumferential cooling force on the catheter. An air-ring drying device enables rapid, water-stain-free drying of the catheter surface. The entire system adopts a closed-loop water circulation design, with no water overflow, which maintains a clean workshop environment while stably controlling the cooling water temperature, fully ensuring the consistency and stability of catheter roundness dimensions.

（3）Blesson High-Precision Haul-Off and Conveying System

• The Blesson haul-off machine adopts a dedicated medical catheter haul-off structure, enabling long-term uniform and stable conveying, with no slipping and low noise during operation, and excellent line speed control accuracy. The clamping mechanism features a flexible adaptive design, with uniform and controllable clamping force that does not damage the outer wall of the catheter while ensuring stable conveying tension. This provides fundamental support for subsequent fixed-length cutting and diameter consistency, making it suitable for continuous and stable production of long central venous catheters.

（4）Blesson Precision Cutting System

• Structural Configuration: The Blesson cutting machine uses a lightweight aluminum alloy blade arm paired with a dedicated medical catheter blade sleeve. The blade arm has low motion inertia and fast response, and the blade sleeve can accommodate central venous catheters of different diameters, ensuring a stable and precise cutting process.
• Performance Characteristics: The cut edge is smooth and flat, with no burrs or flashes, and no subsequent secondary grinding is required, avoiding the risk of debris at the catheter port and meeting the port quality requirements of medical catheters. Cutting length and production count can be freely set and precisely controlled through the control system, meeting the fixed-length production needs of catheters of different specifications while facilitating production batch management and output statistics.

（5）Blesson Fully Closed-Loop Servo Synchronized Control System

• The main machine and the entire haul-off unit adopt fully closed-loop servo synchronized control. The system can collect real-time operating parameters at the extrusion end, such as extrusion pressure, melt temperature, and output rate. The haul-off speed adaptively synchronizes with the extrusion conditions in real time. It automatically offsets diameter deviations caused by ambient temperature fluctuations, voltage fluctuations, and minor differences in raw material properties, ultimately achieving a high standard of tube outer diameter accuracy up to ±0.03 mm. This fully meets the quality control requirements for high-precision medical devices such as central venous catheters, ensuring batch consistency and product qualification rate.

The entire Blesson production line, from clean design and molding precision to operational stability, is developed around the production needs of medical catheters. It complies with relevant regulatory requirements for medical device production and combines production efficiency with finished product quality. It can stably output central venous catheters that meet clinical use standards and is a highly adaptable solution for medical precision catheter extrusion production. Blesson can provide customized services according to different customer needs.