Nd:YAG laser-welded canine arteriovenous anastomoses

Area of Science:

• Vascular Surgery
• Biomedical Engineering
• Laser Medicine

Background:

• Arteriovenous fistulas are crucial for hemodialysis access.
• Laser welding offers a potential alternative to traditional suturing techniques for vascular anastomosis.
• Developing minimally invasive and effective methods for fistula creation is an ongoing area of research.

Purpose of the Study:

• To evaluate the feasibility of using a 1.32-microns wavelength Nd:YAG laser welding technique for creating femoral arteriovenous fistulas in a canine model.
• To assess the immediate patency and histological outcomes of laser-welded anastomoses.

Main Methods:

• Femoral arteriovenous fistulas were created in six dogs using Nd:YAG laser welding.
• Stay sutures were used for vessel apposition, and laser energy was delivered via fiber optic.
• Computer-controlled software managed laser energy delivery with specific fluence parameters.
• Vessel patency was maintained for 1-2 hours post-procedure before tissue harvesting for histological examination.

Main Results:

• Successful formation of ten femoral arteriovenous fistulas was achieved.
• No thrombosis or delayed anastomotic failures were observed in the initial post-welding period.
• Histological examination showed good wall apposition, adherence, and mild thermal injury at some anastomoses.

Conclusions:

• The 1.32-microns Nd:YAG laser welding technique is a viable method for creating large vessel arteriovenous fistulas in canines.
• This laser welding approach shows promise for vascular anastomosis, potentially reducing complications associated with traditional suturing.
• Further investigation is warranted to explore long-term outcomes and clinical applicability.