Views: 0 Author: JINCHEN/JINGCHENG Publish Time: 2026-02-27 Origin: JINCHEN/JINGCHENG
In the field of neurointerventional diagnosis and treatment, accuracy and safety are the core considerations in device design. Due to the complex intracranial vascular pathways and slender lumens, strict requirements are placed on the mechanical properties, inner cavity space and surface characteristics of interventional catheters. Ptfe-lined tubes, with their unique material properties and structural advantages, have become a key technology to solve the performance bottleneck of neurointerventional catheters and have demonstrated irreplaceable application value in a variety of specialized instruments.
Mechanical performance optimization: The core support for ensuring precise operation
In neurointerventional surgery, the catheter needs to be pushed over long distances and precisely positioned in tortuous blood vessels, which requires extremely high axial load transmission capacity of the material. The PTFE-lined tube, with its high yield strength characteristic, effectively reduces plastic deformation during the pushing process, ensuring that the thrust is efficiently transmitted to the far end. For instance, in complex surgical procedures such as close-mesh stent implantation, the stable mechanical performance of the inner lining tube can achieve precise release of the stent and avoid positioning deviations caused by catheter deformation. Meanwhile, its high tensile strength design can withstand tensile stress during repeated operations, especially suitable for thin-walled instruments such as 5F/6F guiding catheters - these catheters need to accommodate various interventional instruments, with a wall thickness of only 0.3-0.5mm. The PTFE-lined tube can significantly enhance the anti-fracture ability, prevent delamination risks, and ensure surgical safety.
Structural innovation: Breaking through the balance problem between inner cavity space and passability
The tortuous and narrowed characteristics of intracranial blood vessels require that the catheter maximize the internal cavity space under a limited outer diameter. The high plasticity of PTFE material enables it to extrude ultra-thin film layers with a wall thickness as low as 50μm, and to construct a double-layer structure of "lubricating inner lining + supporting outer layer" in composite conduits. Take the distal nerve access catheter as an example. Through the thin-walled design of the PTFE-lined tube, the inner diameter can be expanded to 2.2-2.8mm while maintaining an outer diameter of 2.7-3.3mm, providing ample operating space for microguide wires, coils and other instruments, while improving vascular compliance and reducing the risk of endothelial injury. This structural innovation is particularly important in the treatment of small vessel lesions such as the basilar artery, enabling the catheter to pass through narrow paths while ensuring the efficiency of instrument delivery.
Surface characteristicupgrade: A key breakthrough in reducing operational resistance
The frictional resistance of neurointerventional devices directly affects the operation feel and the duration of the surgery. The hydrophobic surface of the PTFE-lined tube has an extremely low coefficient of friction (0.05-0.1), which can significantly reduce the adhesion force between the guide wire, balloon and the inner wall of the tube. In intracranial aneurysm embolization, the PTFE inner lining layer within the microcatheter can enhance the permeability of the guide wire at the bifurcation of acute Angle vessels, especially suitable for complex anatomical sites such as anterior communicating arteries, enabling doctors to more precisely adjust the position of the microcatheter tip. Clinical data show that catheters lined with PTFE have a 30% to 40% lower resistance to instrument retraction compared to traditional catheters, effectively reducing mechanical damage to vascular endothelium and shortening the operation time by 15% to 20%.
Durability design: A reliable guarantee for complex working conditions
For devices such as suction tubes that need to withstand negative pressure suction, the fatigue resistance of PTFE-lined tubes plays a crucial role. Its stable mechanical strength can prevent the collapse of the tube cavity under negative pressure, especially when aspirating large-load thrombus, it can maintain the structural integrity of the head end and prevent the decrease in aspiration efficiency caused by deformation. This durability design is also applicable to devices with repeated push-pull operations, such as thrombection stent catheters. After ten thousand cycles of testing, the performance degradation rate of PTFE-lined tubes is less than 5%, significantly better than that of traditional polyethylene lined materials (with a degradation rate exceeding 20%), providing a material-level guarantee for the reliability of long-term implanted devices. With the development of neurointerventional technology towards precision and minimally invasive techniques, PTFE-lined tubes are continuously breaking through performance boundaries through material modification and structural innovation. From the fine shaping of distal access to the ultra-micro control of aneurysm embolization, this technology not only addresses the performance pain points of existing devices but also opens up new possibilities for the treatment of complex vascular lesions. When materials science and interventional medicine are deeply integrated, PTFE-lined tubes are becoming an important technical bridge for the neurointerventional field to move from "feasible" to "precise", building more reliable instrument support for the cerebrovascular health of thousands of patients.
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