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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Published on: September 30, 2014

Does bipolar electrocoagulation time affect vessel weld strength?

J D Harrison1, D L Morris

  • 1Department of Surgery, Queen's Medical Centre, Nottingham.

Gut
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

Longer coagulation times significantly increase bipolar electrocoagulation vessel weld strength for effective endoscopic haemostasis. This finding is crucial for optimizing the clinical utility of bipolar electrocoagulators in treating bleeding ulcers.

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Area of Science:

  • Gastroenterology
  • Surgical Technology
  • Biomedical Engineering

Background:

  • The efficacy of bipolar electrocoagulation for achieving haemostasis in bleeding ulcers remains debated.
  • Optimizing haemostatic device performance requires understanding the impact of procedural parameters.

Purpose of the Study:

  • To investigate the relationship between coagulation time and vessel weld strength using a bipolar electrocoagulator.
  • To determine the effect of varying coagulation durations on the haemostatic capacity of endoscopic probes.

Main Methods:

  • Standard 10F endoscopic haemostatic probes were used to create welds in vessels of defined diameters.
  • Coagulation times of two and 20 seconds were applied, and intravascular temperatures were measured.
  • Vessel weld strength was quantified and analyzed in relation to coagulation time and vessel diameter.

Main Results:

  • Vessel weld strength was substantially greater (approximately double) at 20 seconds compared to two seconds of coagulation.
  • Increased weld strength was observed across all tested vessel diameters at the longer coagulation time.
  • A consistent decrease in weld strength was noted as vessel diameter increased, irrespective of coagulation duration.

Conclusions:

  • Vessel weld strength is directly influenced by the duration of bipolar electrocoagulation.
  • Future comparative studies should utilize extended coagulation times and report them to maximize the clinical value of bipolar electrocoagulators.
  • Optimizing coagulation time is essential for enhancing haemostatic effectiveness in endoscopic procedures.