New declotting catheters for arterio-venous shunts

Area of Science:

• Vascular Surgery
• Nephrology
• Biomedical Engineering

Background:

• Clotting in arteriovenous (A-V) shunts is a significant complication for hemodialysis patients.
• Existing declotting methods like balloon embolectomy are often unsuccessful, leading to repeat surgical revisions.
• Frequent shunt revisions compromise vascular access sites, impacting dialysis adequacy.

Purpose of the Study:

• To introduce novel stainless steel instruments designed for declotting A-V shunts.
• To evaluate the efficacy of these new instruments in removing vascular obstructions.
• To reduce the frequency of surgical shunt revisions and prolong shunt lifespan.

Main Methods:

• Development and application of three specific stainless steel instruments: Expanding Mesh, Helix, and Rotating Cutter.
• Targeting common obstruction sites: shunt tips and anastomosis.
• Utilizing instruments to dislodge organized clots, cut fibrin flaps, and enlarge vessel lumens.

Main Results:

• The novel instruments successfully removed vascular obstructions in A-V shunts.
• Successful declotting occurred at critical sites, including shunt tips and anastomosis.
• Prolonged shunt lifespan was achieved, leading to a decrease in necessary surgical revisions.

Conclusions:

• New stainless steel instruments offer an effective solution for declotting A-V shunts.
• These devices can successfully manage common obstruction sites, improving shunt patency.
• The use of these instruments reduces the need for surgical intervention, preserving vascular access for hemodialysis.