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Kidney Week

Abstract: FR-PO479

The Magnetic Snare Endovascular Catheter System for Central Venous Stenosis

Session Information

  • Dialysis: Vascular Access
    November 03, 2023 | Location: Exhibit Hall, Pennsylvania Convention Center
    Abstract Time: 10:00 AM - 12:00 PM

Category: Dialysis

  • 803 Dialysis: Vascular Access

Authors

  • Owen, Jonathan G., University of New Mexico Health Sciences Center, Albuquerque, New Mexico, United States
  • Bender, Alex, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, United States
Background

Central venous stenosis (CVS) is a common complication in patients with End Stage Kidney Disease undergoing hemodialysis, and most commonly occurs after exposure to tunneled dialysis catheters. CVS can lead to vascular access failure and can become life threatening. Sharp needle recanalization is an option for revascularization when a lesion can be approached bi-directionally, i.e. from the femoral vein and the internal jugular vein, however this procedure carries a high-risk of mediastinal perforation, which can be rapidly fatal. A novel two catheter system, the Magnetic Snare Endovascular Catheter (patent pending PCT/US23/62960), utilizing magnets to approximate either end of the stenosis has recently been developed to address this problem and improve safety of the revascularization procedure.

Methods

Mechanical engineering students at the University of New Mexico were recruited to develop an initial prototype of the catheter system. After initial success, one of the graduates was retained for further work and development of additional working prototypes.

Results

Three distinct prototype catheter systems have been developed for further testing. The first prototype utilizes a neodymium to neodymium magnetic tip and would traverse a central stenosis using thermal or radiofrequency energy. The second catheter design utilized a broad-based neodymium magnet on one catheter, and a needle fashioned from neodymium on the opposite catheter. The final prototype consists of a powerful electromagnetic tip that would be used to attract conventional steel needles and guidewires from the opposing side.

Conclusion

The Magnetic Snare Endovascular Catheter system is a promising new technology to improve safety of central venous stenosis revascularization. Three working prototypes are now developed for additional testing.

Figure 1: Proof of concept using a pig heart model

Funding

  • Private Foundation Support