In the field of medical cosmetology, intense pulsed light (IPL, commonly known as photorejuvenation) has become a common photoelectric treatment project in medical cosmetology institutions due to its wide treatment range and low trauma. In clinical operations, it is necessary to accurately master parameter settings and endpoint reaction judgments to ensure efficacy and safety. This article systematically sorts out the key points of clinical application of intense pulsed light from the dimensions of technical principles, parameter selection, and operating specifications.

• Laser: monochromatic narrow spectrum light (such as 532nm, 755nm), highly concentrated energy, targeting specific target tissues (such as melanin, hemoglobin).

• Intense pulsed light: Broad-spectrum composite light (wavelength 400-1200nm), through the filter to select specific bands, to achieve multi-effect treatment (such as freckle removal, redness removal, skin rejuvenation).

Based on selective photothermal effect: Target tissues (such as melanin, hemoglobin) absorb the corresponding wavelength of light energy and convert it into heat energy, resulting in selective destruction, while the surrounding normal tissues have a low absorption rate and a lower risk of damage.

PRINCIPLES AND MECHANISMS

Core treatment parameters and endpoint response judgment

Parameter strategy (reference range):

Dark skin (Fitzpatrick IV-V type): Energy 15-23J/cm², pulse width 3.0-6.0ms, 2-3 pulses;

Light skin (I-III type): Energy 18-25J/cm², pulse width can be shortened to 2.5-4.0ms;

Sensitive area (eye area/forehead): Energy reduced by 1-2J/cm².

End point reaction:

Basic skin rejuvenation: slight warming of the skin;

Pigmentation treatment: temporary deepening of spots, mild edema around;

Vascular treatment: superficial blood vessels are blurred or lightened.

Treatment course recommendation: 3-5 treatments are required, with an interval of 3-4 weeks. Combining sunscreen and moisturizing can enhance long-term effects.

2、Pigmentary lesions (freckles, solar lentigo, etc.)

Indications and limitations:

Freckles, solar lentigo: Most patients can improve;

Café au lait spots: Some patients are effective;

Chloasma: Need to be combined with oral tranexamic acid, using low-energy mode (end point is local mild erythema).

Parameter adjustment:

Shallow skin lesions: pulse width 3.5-4.0ms, energy 14-17J/cm²;

Deep skin lesions: pulse width 4.0-4.5ms, energy reduced by 10%-15%.

3、Hair removal treatment

Technical points:

Wavelength selection: 615/640nm for superficial hair (such as lip hair), 695/755nm for deep hair (such as leg hair);

Hair growth cycle: Treatment is required during the growth period (hair length 2-3mm), with an interval of 4-6 weeks.

End point reaction: slight erythema around the hair follicles, occasionally curly hair.

4、Vascular diseases and inflammatory skin problems

• Vascular lesions (red blood streaks, vascular nevus):

Filter selection: 560nm priority, pulse width 3.0-4.5ms;

End point reaction: blood vessels turn gray or close temporarily.

• Acne/rosacea:

Energy limit: 15-18J/cm², endpoint is mild redness of the lesion (to avoid worsening inflammation).

Light spot test: Test at the jaw angle or preauricular area (similar to the skin color of the treatment area), and continue treatment after observing for 15 minutes without purpura or blisters.

Contraindications: photosensitivity diseases, pregnancy/lactation period, skin infection, recent history of sun exposure (within 4 weeks).

Energy adjustment principle: Start from low energy and gradually increase, with the skin slightly red (non-sensitive skin) or no erythema (dark skin) as the safety threshold.

Zoning operation skills:

Sequence: irradiate from the periphery to the center, from bottom to top, with 10%-20% overlap of light spots;

Bony protrusions (zygomatic bones/forehead): energy reduction of 1-2J/cm²;

Vascular treatment: use the cooling system to pre-cool for 3-5 seconds.

Immediate care: ice compress for 10-15 minutes, avoid high temperature stimulation (hot water/steam sauna) within 24 hours.

Adverse reaction tips:

Common: temporary erythema (dissipates in 1-3 days), pigmentation (5-15%);

Rare: blisters (improper operation), scars (dark skin or high energy risk).

Repair suggestions: use medical dressings to moisturize for 72 hours after surgery and avoid irritating skin care products.

CLINICAL SUMMARY

Clinical Summary and Risk Warning

Efficacy Management: Most problems require 3-5 treatments, and individual differences are large. Patients should be informed of reasonable expectations in advance.

Core principles:

Parameter matching: Dynamically adjust energy and pulse width according to skin color and skin lesion type;

Risk control: It is better to be low than high to avoid overtreatment and adverse reactions.

Contraindications: Patients with scar constitution and immunodeficiency need to be carefully evaluated.

The core founding team of Suzhou Foremed Legend Medical Technology Co., Ltd. comes from well-known universities at home and abroad such as Peking University. Foremed Legend focuses on the design, research and development and application of high-end medical beauty optoelectronic equipment based on compliance and product strength. It is committed to becoming a leading enterprise in the field of high-end medical beauty optoelectronic equipment, a provider of integrated diagnosis and treatment intelligent solutions, and a pioneer of medical beauty data integration platform.

Through the development of a series of underlying key technologies, Foremed Legend has independently developed a number of high-end medical devices, including picosecond laser therapy devices, long pulse laser therapy devices, intense pulsed light therapy devices, photoacoustic imaging skin detection devices, and cold air therapy devices. It continues to deepen the research and development of core product technologies, and use better technical solutions to benefit the vast number of beauty seekers.

Adhering to the principle of technology for good, Foremed Legend will work with industry and ecological partners to bring more safe and effective medical beauty optoelectronic equipment and integrated diagnosis and treatment solutions to the global medical beauty market.