Sutureless rabbit bladder mucosa patch graft urethroplasty using diode laser and solder

Area of Science:

• Urology
• Biomaterials Science
• Surgical Innovation

Background:

• Urethroplasty complications like fistula and strictures are common with conventional sutured anastomoses.
• Novel techniques are needed to improve repair strength, speed, and reduce adverse outcomes.

Purpose of the Study:

• To evaluate the efficacy of bladder mucosa patch graft urethroplasty using diode laser welding and albumin-based solder.
• To compare laser-assisted repair with traditional sutured closure for large urethral defects.

Main Methods:

• Bladder mucosa grafts were used to repair large proximal urethral defects in rabbits.
• Repairs were performed using diode laser activation of albumin-based solder or conventional 7-zero polydiaxanone sutures.
• Leak pressure, repair time, urethroscopy, radiography, and histology were assessed postoperatively.

Main Results:

• Laser repair was significantly faster (13.8 min vs. 24.0 min) and had 4x higher initial leak pressures than sutured repair.
• Early retrograde urethrograms showed no fistula or extravasation in the laser group versus 2/5 in controls at 7 days.
• At 21 days, laser repairs had smooth urethras, while controls showed mucosal proliferation; histology confirmed graft viability at 6 weeks.

Conclusions:

• Diode laser welding with albumin-based solder provides a robust and effective method for bladder mucosa patch graft urethroplasty.
• This technique presents an attractive alternative to conventional sutured repairs, minimizing complications.
• The laser-assisted approach demonstrates superior strength and reduced adverse events in urethral reconstruction.