High yield strength: The core competitiveness of free extrusion PTFE lining technology

In the field of medical devices, the design and material selection of catheters are crucial for the success rate of surgeries and patient safety, especially in vascular interventional therapy. Besides flexibility and pushability, catheters must also have sufficient strength to resist external forces and prevent deformation or damage during operation.

Ptfe-lined tubes, due to their unique physical and chemical properties, have become one of the preferred materials for medical catheter design. Especially under the application of free extrusion technology, the yield force of PTFE-lined tubes has been significantly enhanced, bringing revolutionary improvements to the performance and reliability of medical catheters.

Yield force refers to the maximum stress that a material can withstand before undergoing plastic deformation under the action of an external force. Yield force is an important mechanical performance index, which is related to the stability and reliability of the conduit during use. A higher yield strength means that the material can withstand greater stress without plastic failure, and has better strength and rigidity.

                                                                                                     Free extrusion process: Molecular orientation and yield force

For PTFE-lined tubes, the yield force is not only related to the properties of the material itself, but also deeply influenced by the manufacturing process.

The common manufacturing processes of ultra-thin-walled PTFE inner lining tubes at present include: casting process, free extrusion process, and mandrel extrusion process. Different production methods will result in different molecular arrangements of the original fibers, and then produce PTFE inner lining tubes with different yield forces.

                                                                                                                                  How to improve yield strength

Production process: The free extrusion process is selected. As mentioned above, due to the directional arrangement of molecular chains, PTFE inner lining tubes produced by the free extrusion process usually have a higher yield force. This means that in medical device applications, especially when the catheter needs to withstand greater force or navigate through complex paths, choosing PTFE-lined tubes with free extrusion technology will have higher performance advantages.

Thanks to its outstanding extrusion process, the MatrixLiner® freely extruded PTFE inner lining tubes of Jemite's Jemite Jiacheng have excellent performance. Their yield strength, tensile strength, and tensile force per unit area can reach the same level as those of well-known foreign brands in the same industry.

                                                                                           Customized solutions: The perfect balance between wall thickness and yield force

In addition to the material and manufacturing process, the wall thickness of PTFE lined tubes is also one of the factors affecting the yield force. The relationship between wall thickness and yield force is not a simple direct proportional one. Generally speaking, as a material with a low elastic modulus, PTFE can enhance its load-bearing capacity by increasing the wall thickness, but it will not lead to a proportional increase in yield force. In addition, an overly thick wall thickness may cause the catheter to become overly rigid, affecting its flexibility and operability.

Therefore, it is necessary to enhance the yield force of the conduit without significantly increasing its stiffness by optimizing the wall thickness and other design parameters of the conduit (such as outer diameter, length, etc.).
Jiemeijiacheng MatrixLiner® freely extruded PTFE inner lining tubes can be designed and customized according to the specific requirements of customers, ensuring that PTFE inner lining tubes of different wall thicknesses all achieve the expected yield force. From special dimensions to specific performance, our technical team can closely cooperate with customers to develop the most suitable products.