Electrophysical factors influencing endoscopic sphincterotomy

Area of Science:

• Medical Devices
• Surgical Technology
• Electrosurgery

Background:

• Analog computer techniques were employed to quantify electrosurgical power during sphincterotomy.
• Measurements were conducted in both experimental settings and clinical patient cases.

Purpose of the Study:

• To measure electrosurgical power during sphincterotomy.
• To evaluate the impact of different waveforms (CUT, COAG, BLEND) on cutting efficiency and hemostasis.
• To identify factors influencing electrosurgical cutting performance.

Main Methods:

• Electrosurgical power, total energy, and transient power changes were measured during sphincterotomy in pigs and human post-mortem samples.
• The influence of waveform on hemostasis was assessed using canine mesenteric arteries.
• Factors such as wire contact length, power settings, force, and wire diameter were manipulated and analyzed.

Main Results:

• Cutting efficiency increased linearly with power, and halving wire contact length reduced the energy needed to initiate cutting.
• The CUT waveform was less effective at lower power settings compared to BLEND, while COAG required higher power for cutting initiation.
• BLEND demonstrated better hemostasis than CUT, and COAG provided superior hemostasis but poorer cutting performance.

Conclusions:

• Shortening wire contact length aids cutting initiation at suboptimal settings; increasing power may be necessary if cutting fails.
• BLEND waveform offers improved hemostasis over CUT, while COAG provides the best hemostasis at the expense of cutting efficacy.
• Clinical sphincterotomy cutting efficiency is suboptimal and presents opportunities for improvement through optimized electrosurgical techniques.