Laser power outputs following repeated use.

PurposeTo evaluate the laser power stability of the SubCyclo probe for micropulse transscleral cyclophotocoagulation after repeated use.Materials and methodsThis experimental study involved 6 new probes. Each probe was connected to the SubCyclo mode (2,000 mW power, 31.3% duty cycle, and 100 seconds duration) of the Vitra 810 laser delivery system (Quantel Medical, France). Laser power measurements were taken using a calibrated laser power meter (Nova, Ophir Optronics Solutions, Israel) every 10 seconds from 10 to 90 seconds during each of the 40 cycles. Intra-rater reliability was assessed using intraclass correlation (ICC). A linear mixed model for repeated measures and pairwise comparisons with Bonferroni adjustment were used for the analysis.ResultsThe mean (SD) power outputs of all probes for the first cycle and all cycles were 421.9 (19.7) mW and 436.7 (16.1) mW, respectively. During the first cycle, the mean (SD) laser power gradually decreased from 444.3 (13.4) mW at 10 seconds to 407.3 (17.0) mW at 90 seconds (Fig 3). For all cycles, the power was 446.0 (13.6) mW at 10 seconds and gradually declined to 426.8 (21.0) mW at 90 seconds. Pairwise comparisons revealed significant differences in mean laser power outputs after 16 cycles of repeated use compared to the first cycle. The ICC estimate (95% CI) for intra-rater reliability was 0.96 (0.89, 0.99).ConclusionsThe SubCyclo probe maintains stable laser power outputs throughout repeated use for up to 16 cycles, with a significant increase observed after 16 cycles.**研究目的**：评估用于微脉冲经巩膜睫状体光凝术（micropulse transscleral cyclophotocoagulation）的SubCyclo探头（SubCyclo probe）在重复使用后的激光功率稳定性。 **材料与方法**：本实验研究共纳入6支全新SubCyclo探头。将每支探头连接至法国Quantel Medical公司的Vitra 810激光传输系统（Vitra 810 laser delivery system）的SubCyclo模式，该模式参数设置为：功率2000 mW、占空比31.3%、作用时长100秒。在40个循环周期的每个周期内，于10至90秒的时间范围内，每10秒使用一台校准激光功率计（以色列Ophir Optronics Solutions公司Nova型号）采集激光功率数据。采用组内相关系数（ICC）评估评分者内部信度，分析过程采用重复测量线性混合模型结合邦费罗尼校正的两两比较方法。 **结果**：所有探头在首个循环周期及全部循环周期的平均（标准差）功率输出分别为421.9（19.7）mW与436.7（16.1）mW。在首个循环周期内，平均（标准差）激光功率从10秒时的444.3（13.4）mW逐渐下降至90秒时的407.3（17.0）mW（图3）。在全部循环周期中，10秒时的平均功率为446.0（13.6）mW，并逐渐下降至90秒时的426.8（21.0）mW。两两比较结果显示，重复使用16个循环后，探头的平均激光功率输出与首个循环周期相比存在显著差异。评分者内部信度的组内相关系数估计值（95%置信区间）为0.96（0.89，0.99）。 **结论**：SubCyclo探头在重复使用至多16个循环周期的过程中可维持稳定的激光功率输出，且在16个循环后功率输出出现显著升高。