PTFE Artificial Vascular Grafts in Dialysis Access: Current Status and Future Directions

Chronic kidney disease and end-stage renal failure require long-term hemodialysis treatment to maintain patient life, and stable and effective vascular access is the lifeline of hemodialysis patients. Clinically common dialysis access modes include autologous arteriovenous fistula, artificial vascular graft fistula and central venous catheter. For patients with poor autologous vascular conditions, failed autologous fistula plasty, and insufficient superficial vascular resources, PTFE artificial vascular grafts have become the most important and reliable dialysis access material. PTFE dialysis access grafts have the advantages of convenient operation, mature technology, stable blood flow and long service life, and have been widely used in hemodialysis clinical treatment. In-depth analysis of the current clinical application status and future development directions of PTFE dialysis vascular grafts is of great significance to improve the dialysis effect and survival quality of renal failure patients PTFE SHEET.

At present, PTFE artificial vascular grafts have become the mainstream alternative dialysis access in clinical hemodialysis. Compared with polyurethane and other synthetic dialysis vascular grafts, PTFE grafts have excellent mechanical stability, anti-puncture performance and long-term patency performance, which can adapt to repeated dialysis puncture and long-term high-flow blood flushing. Medical-grade PTFE dialysis vascular grafts have standardized diameter specifications and wall thickness design, which can meet the high blood flow requirements of hemodialysis, ensure sufficient dialysis blood volume, and improve dialysis efficiency. After years of clinical promotion, the surgical implantation technology, postoperative maintenance scheme and complication prevention system of PTFE dialysis grafts have been completely mature, and the clinical success rate of primary implantation is extremely high.

In clinical application, PTFE dialysis access grafts also face some unavoidable challenges, including postoperative thrombosis, intimal hyperplasia, puncture site stenosis, infection and pseudoaneurysm formation. Long-term repeated dialysis puncture will cause local vascular wall damage and tissue hyperplasia, leading to anastomotic and puncture site stenosis, which is the main cause of dialysis access failure. In addition, hemodialysis patients are mostly in hypercoagulable and low-immunity state, with high risk of thrombosis and infection after graft implantation. Aiming at these clinical pain points, modified high-performance PTFE dialysis vascular grafts have been continuously launched in recent years, including heparin-coated anticoagulant grafts, antibacterial modified grafts and reinforced anti-puncture grafts, which effectively reduce the incidence of postoperative complications PTFE TUBE.

The future development direction of PTFE dialysis access vascular grafts focuses on high patency, anti-complication, intelligentization and individualized customization. First of all, multi-functional composite modification technology will be further popularized, integrating anticoagulation, anti-inflammation, antibacterial and anti-hyperplasia functions to comprehensively reduce the failure rate of dialysis access. Secondly, gradient structural optimization and bionic mechanical design will solve the problem of anastomotic stenosis caused by compliance mismatch, and improve the long-term unobstructed rate of dialysis grafts. Thirdly, anti-puncture reinforced structure design will be optimized to adapt to long-term repeated dialysis puncture, reduce puncture damage and local hyperplasia, and extend the service life of grafts.

Intelligent dialysis vascular graft is an innovative future development direction. By integrating miniature sensing components or responsive functional layers on the basis of PTFE grafts, real-time monitoring of graft blood flow, intimal hyperplasia degree and inflammatory state can be realized, which can early predict thrombosis and stenosis risk, guide clinical intervention and maintenance, and greatly reduce the incidence of sudden dialysis access failure. In addition, individualized customized PTFE dialysis grafts will be developed for patients with special vascular conditions, realizing personalized vascular access construction and improving the applicability and efficacy of dialysis grafts.

In conclusion, PTFE artificial vascular grafts are the core dialysis access material for hemodialysis patients with poor autologous vascular conditions, with mature clinical application system and stable curative effect. With the continuous progress of material modification, structural optimization and intelligent technology, the comprehensive performance of PTFE dialysis vascular grafts will be further improved, effectively solving the clinical complications of dialysis access, extending the service life of vascular access, and improving the long-term survival quality of end-stage renal disease patients.