Comprehensive Study Guide to Desincrustation: Principles, Protocol, and Safety

Definition and Overview of Desincrustation

• Definition: Desincrustation is an electrotherapy procedure utilizing a specialized electrical apparatus designed to rid the skin of deep-seated impurities, cellular debris, and excess sebum accumulated on the surface and within the stratum corneum (couche cornée).

• Core Mechanism: The treatment operates through a chemical process of saponification, combining galvanic direct current with an alkaline chemical reaction to dissolve and emulsify fatty deposits (sébum).

• Physical-Chemical Basis: The application of a continuous galvanic current causes the electrolysis of an alkaline salt solution, producing sodium hydroxide (soda), which chemically transforms solid fatty acids into soluble soap.

Technical Specifications and Equipment Description

• Main Generator Unit: A housing cabinet containing an alternating current (AC) power source, which is rectified into direct continuous current (DC) by means of semiconductor diodes.

• Voltage Step-Down: An internal electrical transformer decreases the operating electrical potential to a safe maximum threshold of $60\,V$.

• Power Control: Features an integrated ON/OFF (marche/arrêt) power switch.

• Intensity Potentiometer: An adjustable rotary potentiometer allowing progressive, millimeter-level regulation of current output.

• Terminal Connectors:

  • Positive Terminal: Marked in red ($+$ pole).

  • Negative Terminal: Marked in black ($-$ pole).

• Conductor Wiring: Color-coded leads consisting of one blue wire and one black wire to establish polarity.

• Electrodes:

  • Active Electrode (Working Electrode): A negative swab-holding electrode (porte-tampon) fitted with a cotton pad or specialized sponge sleeve designed to make direct contact with the treated facial zones.

  • Passive Electrode (Indifferent Electrode): A positive metallic ground electrode designed to be held firmly in the client's hand to complete the electrical circuit.

Chemical and Physical Principles of Operation

• Dual Phenomenon: Under the influence of the direct galvanic current, two distinct chemical and physical phenomena occur concurrently:

  • Electrolysis: When the negative active electrode is covered with a sponge impregnated with a sodium chloride ($NaCl$) solution, electrolysis occurs at the negative pole, yielding sodium hydroxide (soda, or soude).

  • Saponification Reaction: The newly formed alkaline soda ($NaOH$) at the active electrode immediately reacts with the acidic sebum present on the cutaneous surface, triggering saponification:     $\text{Sebum} + \text{Soda} \rightarrow \text{Soap} + \text{Alcohol}$     $\text{Sébum} + \text{soude} = \text{savon} + \text{alcool}$

• Emulsification: The chemical transformation converts solid, pore-clogging sebum into an easily washable, water-soluble soap emulsion.

Electrolyte Composition and Preparation

• Definition of Electrolyte: The chemical ionic solution or compound formulated to undergo electrolytic breakdown under the electrical current.

• Acceptable Solutes:

  • Sodium chloride ($NaCl$), commonly referred to as table salt.

  • Sodium carbonate ($Na_2CO_3$ or $CO_3Na_2$).

• Standard In-House Preparation:

  • Water volume: $1\,l$ ($1\,dm^3$) of purified water.

  • Salt mass: Add between $3\,g$ and $6\,g$ of salt ($NaCl$).

  • Blend thoroughly until the solute is completely dissolved.

• Commercial Formulations: Ready-to-use, standardized electrolyte solutions formulated and distributed by specialized aesthetic laboratories.

• Application: The prepared electrolyte solution is used exclusively to thoroughly soak the cotton or sponge sheath attached to the active negative electrode.

Step-by-Step Operating Procedure

• Pre-Check Connections and Polarities:

  • Verify that the active swab-holding electrode is correctly attached to the negative terminal ($-$ pole).

  • Verify that the passive indifferent electrode is correctly plugged into the positive terminal ($+$ pole).

  • Confirm that the power switch is in the OFF position ($0$).

  • Ensure the intensity potentiometer is turned down completely to zero ($0$).

• Electrolyte Loading:

  • Dispense a small volume of electrolyte solution into a sanitized dish (coupelle).

  • Fully immerse the electrode sponge or cotton pad into the solution.

  • Wring out excess liquid thoroughly to prevent dripping, and secure the saturated pad onto the head of the active electrode.

• Client Setup and Circuit Closure:

  • Hand the positive indifferent electrode to the client, instructing them to maintain a firm, constant grip throughout the entire procedure.

  • Place the active negative electrode firmly in direct physical contact with the client's skin before engaging current flow.

• Current Activation and Intensity Calibration:

  • Switch the power switch to the ON position.

  • Continuously watch the needle on the milliampere meter (milli-ampèremètre).

  • Rotate the intensity potentiometer slowly, smoothly, and progressively to introduce current.

  • Monitor the client's verbal feedback and comfort: the client must feel only faint prickling or tingling sensations (légers picotements), indicating that the cutaneous sensitivity threshold (seuil de sensibilité) has been attained.

  • Stop advancing current intensity as soon as prickling is perceived; under no circumstances should the current exceed $3\,mA$.

• Execution of Desincrustation:

  • Hold the handle of the active electrode lightly with the fingertips.

  • Move the electrode across the target treatment zones using continuous, slow, circular passes.

  • Maintain light, steady surface pressure, ensuring continuous contact with the skin surface without lifting the electrode.

  • Continuously observe the client's comfort and keep track of the milliampere meter needle, which must remain calm, steady, and stable.

• Deactivation and Post-Treatment Steps:

  • At the conclusion of the treatment pass, rotate the potentiometer progressively back to zero ($0$) and switch the unit OFF before lifting the active electrode away from the skin surface.

  • Retrieve the passive indifferent electrode from the client's hand.

  • Cleanse and rinse the treated skin thoroughly using a cotton pad saturated with skin lotion to eliminate all saponified sebum, soap residues, and alkaline deposits.

Clinical Precautions and Safety Guidelines

• Integrity of the Cutaneous Barrier: The treated skin area must be entirely intact and free of open wounds, cuts, abrasions, scratches, or active dermatoses, as electrical current naturally concentrates around skin breaks, leading to electrical and chemical burns.

• Metal Precautions:

  • Ensure the client is comfortably positioned and has no contact with external metallic furnishings or structural metal components.

  • Require the removal of all personal metallic adornments, jewelry, rings, and bracelets prior to activating current.

• Dental Proximity Caveat: Avoid lingering excessively over identical spots or in close proximity to dental crowns, metal bridges, or fillings, which can produce an unpleasant metallic taste in the mouth due to galvanic micro-current transmission.

• Prior Skin Preparation: Conduct a thorough preliminary skin cleansing prior to initiating the desincrustation protocol.

• Sponge Maintenance and Handling:

  • Confirm that the applicator sponge is of premium quality, intact, and well-wrung out before treatment.

  • Clean and wash sponges thoroughly immediately after every individual client application.

• Dynamic Movement Rule: Never leave the active swab-holding electrode stationary or motionless on the skin surface, and never remove it abruptly while electrical current is active.

Indications, Treatment Sequence, and Physiological Effects

• Chemical Action and Primary Effects:

  • Generation of localized sodium hydroxide followed by chemical saponification of fatty substances.

  • Produces deep pore desincrustation, follicular clearance, and thorough skin purification.

• Physical Action and Primary Effects:

  • Delivery of direct galvanic electrical energy.

  • Triggers biological cellular stimulation and localized vasodilation (vasodilatation), promoting vascular exchange and tissue softening.

• Treatment Sequence within Facial Protocols:

  • Applied strictly following preliminary makeup removal (démaquillage) or mechanical exfoliation (gommage).

  • Applied directly prior to manual comedone extraction, optimizing sebum softening to facilitate extraction.

Contraindications and Equipment Maintenance

• Absolute Contraindications:

  • Individuals with implanted cardiac pacemakers or internal medical electronic devices.

  • Individuals suffering from evolutive or progressive pathologies (such as active cancer, tuberculosis, or HIV/AIDS).

  • Highly sensitive or reactive skin types presenting vascular anomalies, such as couperose, rosacea, or circulatory disorders.

• Sanitization and Maintenance Protocol:

  • Wash all sponges, cotton fixtures, and electrode metal heads thoroughly with warm water and soap after every client.

  • Apply an approved disinfectant across all reusable contact electrodes and accessories.

  • Store all components clean, dry, and shielded from dust contamination between treatment sessions.