Objective: To explore the effect and safety of fractional 1565 nm laser on white striae gravidarum (SG) in abdomen and observe the influencing factors of treatment effect. Methods: Thirty-six patients, aged 24-39 years old, were randomly divided into two groups(group A, n=16, group B, n=20): patients in group A underwent two passes of laser treatment: striae were locally scanned at moderate level energy(35 mJ/μb) with high density(300 dot/cm²), and high level energy (45 mJ/μb)with low density(150 dot/cm²)was adopted for the whole area.Group B received one pass of treatment at moderate energy with high density 35 mJ/μb, 300 dot/cm²). All patients received three laser treatments at a 6 weeks interval. Improvement of SG appearance was assessed by blinded reviewers, 3 months after the last treatment, using a percentage category scale. Meanwhile, patients satisfaction was evaluated. The impact of skin aging on laser treatment was evaluated. Patient satisfaction scores and side effects were evaluated. Results: All patients completed the overall trial. The average improvement of scores was 1.69±0.95, which contributed to a fairly good response rate of 88.89%. The patients satisfactory and very satisfactory rate was 58.3%(21/36). There was no significant difference in improvement score between group A(1.88±0.89) and group B(1.55±1.00) (P< 0.01). The operation duration of group B was shorter than group A, (29.6±4.9)min vs.(53.7±5.5)min, P<0.05. There was a moderate negative correlation between aging and laser treatment effect (r=-0.553). The abnormal color of skin(erythema and post-inflammatory hyperpigmentation) in group A lasted longer than group B, (9.17±4.03)d vs. (6.73±2.29)d, P<0.05.The pain score during treatment was tolerable, with the score of 2.61±0.76. Conclusions The treatment with fractional 1565 nm laser can improve the appearance of SG. It is more timesaving when the entire implicated area treated by one pass at moderate level energy with high density. Skin aging will discount the effect.

Photoelectric and ultrasonic technology rapid development has brought more choices for facial rejuvenation, but its prosperous clinical application forms a sharp contrast with its weak theoretical based research. Moreover, there is still no consensus on how to standardize the short-term and long-term effects of skin rejuvenation for different energy sources. This paper summarizes the application and progress of photoelectric and ultrasonic technology in facial rejuvenation in recent years, with emphasis on its characteristics and combination with other non-surgical treatments. Combining a variety of non-surgical treatments to maximize efficacy and balance the related risks is the direction of future development.

Objective To investigate the effect and safety of hair removal via subcutaneous route with IPL in expanded flap.Methods A total of 14 experimental zones were established in two healthy Guizhou mini-pigs with dark hair and white skin.All these skin zones were allocated in seven groups:group 1-6 underwent skin soft tissue expansion(stage Ⅰ:implantation of expander,stage Ⅱ:removal of expander).The subcutaneous tissue in group 1 received IPL irradiation of common level during stage Ⅰ and Ⅱ of skin expansion,group 2 received irradiation of high level during stage Ⅰ,group 4 received irradiation of common level during stage Ⅱ,group 5 received irradiation of high level during stage Ⅱ,group 6 received irradiation of low level during stage Ⅰ and Ⅱ as well as flap trim during stage Ⅱ,group 3 received no irradiation,and the skin in group 7 received irradiation of common level through epidermal route during stage Ⅰ and Ⅱ.Treatments were conducted using a contact tip with IPL(λ =650-950 nm) radiant exposures of different fluencies (common level 18 J/cm2,high level 22 J/cm2,and low level 15 J/cm2) with single pulsed duration of 50 ms.The temperature of tissue surface was determined by infrared thermograph.The microcirculation of expansion flap was determined with PeriFlux System.Digital images were taken for the calculation of hair density count by software Image J.Results The temperature of tissue surface received IPL irradiation decreased soon within 2 minutes.The microcirculation of skin expansion flap in group 1,2,3,6 were all restrained,which began to restore within 4 hour post operation.The hair density in group 1 was the lowest with hair removal rate of 79.17％ ± 2.81％,which was higher than the others significantly(P ＜ 0.05).The hair removal rate in group 6 was 72.95％ ± 13.10％.The hair removal rates in group 4 and 5 were lower than 40％.The hair removal rates in group 7 was 67.38％ ± 7.10％.Conclusions IPL irradiation via subcutaneous route may restrain microcirculation of expansion flap transiently,which was reversible.The hair removal rates can reach above 80％ over 6 months post treatment.It indicates that IPL irradiation via subcutaneous route might be a safe and effective hair removal methods,which may be more effective when it is initiated before the implantation of skin expander

Objective To investigate the effect and safety of hair removal via subcutaneous route with IPL in expanded flap.Methods A total of 14 experimental zones were established in two healthy Guizhou mini-pigs with dark hair and white skin.All these skin zones were allocated in seven groups:group 1-6 underwent skin soft tissue expansion(stage Ⅰ:implantation of expander,stage Ⅱ:removal of expander).The subcutaneous tissue in group 1 received IPL irradiation of common level during stage Ⅰ and Ⅱ of skin expansion,group 2 received irradiation of high level during stage Ⅰ,group 4 received irradiation of common level during stage Ⅱ,group 5 received irradiation of high level during stage Ⅱ,group 6 received irradiation of low level during stage Ⅰ and Ⅱ as well as flap trim during stage Ⅱ,group 3 received no irradiation,and the skin in group 7 received irradiation of common level through epidermal route during stage Ⅰ and Ⅱ.Treatments were conducted using a contact tip with IPL(λ =650-950 nm) radiant exposures of different fluencies (common level 18 J/cm2,high level 22 J/cm2,and low level 15 J/cm2) with single pulsed duration of 50 ms.The temperature of tissue surface was determined by infrared thermograph.The microcirculation of expansion flap was determined with PeriFlux System.Digital images were taken for the calculation of hair density count by software Image J.Results The temperature of tissue surface received IPL irradiation decreased soon within 2 minutes.The microcirculation of skin expansion flap in group 1,2,3,6 were all restrained,which began to restore within 4 hour post operation.The hair density in group 1 was the lowest with hair removal rate of 79.17％ ± 2.81％,which was higher than the others significantly(P ＜ 0.05).The hair removal rate in group 6 was 72.95％ ± 13.10％.The hair removal rates in group 4 and 5 were lower than 40％.The hair removal rates in group 7 was 67.38％ ± 7.10％.Conclusions IPL irradiation via subcutaneous route may restrain microcirculation of expansion flap transiently,which was reversible.The hair removal rates can reach above 80％ over 6 months post treatment.It indicates that IPL irradiation via subcutaneous route might be a safe and effective hair removal methods,which may be more effective when it is initiated before the implantation of skin expander

Photoelectric treatment includes laser, intense pulsed light (IPL) and radiofrequency(RF)treatment. For many years, the development of photoelectric technology has focused on skin rejuvenation, and its key is to stimulate the regeneration and remodeling of skin collagen. In this paper, the related factors affecting collagen metabolism are described, and the short-term and long-term effects of IPL, laser and RF at different frequencies and intensities on promoting the collagen regeneration and rearrangement are analyzed and summarized.

With the continuous improvement and development of light therapy, treatment methods based on light energy have been widely used clinically. The effect of light on hair growth, depending on the wavelength, pulse width, and energy level, can lead to a bidirectional action of inhibition or promotion. Based on the literatures, this review summarizes the mechanisms of inhibitory/promoting effects of various light therapies on hair growth and focuses on the characteristics of different therapies, aiming to provide reference for clinical work and basic research in the future.

Various intrinsic and extrinsic factors contribute to facial aging, primarily manifesting in the skin and soft tissues. As aesthetic standards continue to rise, there is an increasing demand for facial rejuvenation. Photoelectric and ultrasonic technology utilizes energy conversion to thermally affect tissues, improving sagging and laxity in the skin and soft tissues through controlled thermal injury that induces beneficial heat effects. This technique has gained popularity due to its rapid, effective, and minimally invasive nature. To achieve optimal result without experiencing excessively harmful thermal effects, it is crucial to properly manage tissue thermal damage. The mechanisms of action for photoelectric and ultrasonic devices used in facial rejuvenation are summarized in this work, along with the effects of heat and thermal injury at various temperatures on tissue cells and molecular biochemistry. Factors influencing thermal effects are also discussed, aiming to optimize treatment parameters and guide safe and effective anti-aging therapies.

Objective To investigate the effect and safety of depilation with intense pulsed light ( IPL) in congenital microtia patients , and observe the impact factors of hair removal .Methods The hairy skin was treated with M22 system using a filter of 695 -1200 nm.Treatments were conducted using a contact probe with a window of 15 cm ×35 mm or 8 cm ×15 mm at a radiant exposures of 16-18 J/cm2 with three pulses(pulse duration:3.5 ms, delay duration:80 ms).Digital photograph was taken for the calculation of hair density with IPP software before treatments .Satisfaction index of hair removal ranked as follows:poor(percent reduction <25％), mild(25％ -50％), good(50％ -75％) and excellent ( >75％) .The hair removal effects was compared between different operation occasions ( skin expansion or non-skin expansion), and different ages(children or adults).Meanwhile, the side effects of IPL were observed.Results A total of 103 cases, aging from 6 to 24 years old with a median age of 9 years old, were included in our follow up project three months later after ear reconstruction .Seventy three cases initiated their hair removal during skin expansion period , and 29 cases initiated during non-expansion period.The reduction of hair density of one session treatment during skin expansion is much higher than that in non-skin expansion (32.4 ±7.1/cm2 vs 23.5 ±7.6/cm2, t=6.007,P=0).Children acchieved more satisfiedresult than those above 15 ages(χ2 =14.721, P=0.002).Instant pain was the main side effect, which was more profound in children with a rarely high pain score of 5.76 ±1.356.There were 4 cases of epifolliculitis , 3 cases of vesiculation .No expander exposure was found in this study .Conclusions Hair removal with intense pulsed light is a safe and effective photo-epilation during all the stages of ear reconstruction .The treatment initiated during skin expansion acchieved betterresult .The effect of hair removal with IPL in children is superior to adults .

With the continuous improvement and development of light therapy, treatment methods based on light energy have been widely used clinically. The effect of light on hair growth, depending on the wavelength, pulse width, and energy level, can lead to a bidirectional action of inhibition or promotion. Based on the literatures, this review summarizes the mechanisms of inhibitory/promoting effects of various light therapies on hair growth and focuses on the characteristics of different therapies, aiming to provide reference for clinical work and basic research in the future.

Various intrinsic and extrinsic factors contribute to facial aging, primarily manifesting in the skin and soft tissues. As aesthetic standards continue to rise, there is an increasing demand for facial rejuvenation. Photoelectric and ultrasonic technology utilizes energy conversion to thermally affect tissues, improving sagging and laxity in the skin and soft tissues through controlled thermal injury that induces beneficial heat effects. This technique has gained popularity due to its rapid, effective, and minimally invasive nature. To achieve optimal result without experiencing excessively harmful thermal effects, it is crucial to properly manage tissue thermal damage. The mechanisms of action for photoelectric and ultrasonic devices used in facial rejuvenation are summarized in this work, along with the effects of heat and thermal injury at various temperatures on tissue cells and molecular biochemistry. Factors influencing thermal effects are also discussed, aiming to optimize treatment parameters and guide safe and effective anti-aging therapies.