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Micropunch grafting for healing of refractory chronic venous leg ulcers
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作者 Aya Mohamed Samy Mostafa Abd El-Halim Ahmed Hassan El-Sabbagh 《Chinese Journal of Plastic and Reconstructive Surgery》 2022年第4期166-170,共5页
Background: Chronic venous ulcers are a serious problem for both patients and physicians. The CEAP classification(clinical manifestations(C), etiologic factors(E), anatomic distribution of disease(A), and underlying p... Background: Chronic venous ulcers are a serious problem for both patients and physicians. The CEAP classification(clinical manifestations(C), etiologic factors(E), anatomic distribution of disease(A), and underlying pathophysiologic findings(P)) for chronic venous disorders(CVD) was developed in 1994. Published papers on CVD use all or part of the CEAP. Micropunch grafts, which are a variation of skin grafts, have been used with great success in plastic surgery for both esthetic and reconstructive purposes. This study aimed to assess the outcomes of micropunch grafting in the treatment of chronic refractory venous ulcers.Methods: Patients with chronic venous ulcers who did not respond to conservative treatment for more than 6months were included in the study. All patients underwent ulcer coverage by micropunch skin grafts using a micrometer. The patients were discharged on the same day as the surgery. Micropunch skin grafts were manually counted per square centimeter intraoperatively and during follow-up using Dermlite DermatoschopeTM II Pro HR.Patient satisfaction was assessed by using a questionnaire.Results: Twenty patients underwent the surgery. Most of the patients were middle-aged males. The ulcers were predominantly small-and medium-sized. The mean operation time was 167.00 ± 86.01 min. After 6 months, the survival rate of the planted micrografts was 84%. Three ulcers had graft loss and two patients had an infection at the ulcer site, which was managed conservatively. The patients were followed-up for 14 months.Conclusion: Micropunch grafting is a useful and convenient method for the treatment of difficult venous ulcers and can be performed on an outpatient basis. 展开更多
关键词 Venous ulcer micropunch grafting
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T2紫铜复杂异形零件渐进微冲裁工艺研究
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作者 郭思宇 马晓光 赵敬伟 《塑性工程学报》 CAS CSCD 北大核心 2024年第9期54-59,共6页
为探究厚度为0.2 mm的介观尺度T2紫铜复杂异形成形件的渐进微冲裁工艺,通过金相腐蚀和拉伸试验获得T2紫铜薄带的微观组织及力学性能,分别利用传统微冲裁工艺与渐进微冲裁工艺制备复杂异形零件,并通过三维激光电镜和扫描电镜对成形件的... 为探究厚度为0.2 mm的介观尺度T2紫铜复杂异形成形件的渐进微冲裁工艺,通过金相腐蚀和拉伸试验获得T2紫铜薄带的微观组织及力学性能,分别利用传统微冲裁工艺与渐进微冲裁工艺制备复杂异形零件,并通过三维激光电镜和扫描电镜对成形件的整体形貌和冲裁断口形貌进行了观测分析。结果表明,渐进微冲裁成形技术与传统微冲裁工艺相比,成形件的尺寸精度和形状精度较高,该工艺可显著降低传统微冲裁工艺中的冲裁件断面圆角带面积,改善撕裂带形貌与光亮带的表面光洁度,获得更好的冲裁断面质量。 展开更多
关键词 铜薄带 渐进微冲裁 复杂异形件 成形质量
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双层串联微穿孔板消声器的设计与试验 被引量:14
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作者 侯献军 田翠翠 +1 位作者 刘志恩 颜伏伍 《机械科学与技术》 CSCD 北大核心 2010年第8期1094-1096,共3页
针对某抽气泵排气噪声从高于80dB(A)降低到72dB(A)以下的要求,应用微穿孔板吸声体理论,设计双层串联微穿孔板消声器,并制作样件进行试验。结果表明安装消声器后,最大噪声值不超过67dB(A)。且在1000Hz~2500Hz频段,噪声下降尤为明显,消... 针对某抽气泵排气噪声从高于80dB(A)降低到72dB(A)以下的要求,应用微穿孔板吸声体理论,设计双层串联微穿孔板消声器,并制作样件进行试验。结果表明安装消声器后,最大噪声值不超过67dB(A)。且在1000Hz~2500Hz频段,噪声下降尤为明显,消声量达到了10dB(A)~20dB(A),满足了设计的目标,验证了理论与实际的一致性。 展开更多
关键词 双层串联微穿孔板 消声器 设计 试验
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微穿孔板消声器的检测与实验 被引量:4
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作者 林来豫 孙凯 肖秋生 《暖通空调》 北大核心 2009年第1期15-19,共5页
指出了当前通风空调工程中使用的微穿孔板消声器由于缺乏质量监管而存在消声效果差的问题,介绍了消声器的检测方法。通过实测证实了单层微穿孔板消声器的消声量太小,必须停止使用。双层微穿孔板消声器的实测消声量也小于手册中给出的数... 指出了当前通风空调工程中使用的微穿孔板消声器由于缺乏质量监管而存在消声效果差的问题,介绍了消声器的检测方法。通过实测证实了单层微穿孔板消声器的消声量太小,必须停止使用。双层微穿孔板消声器的实测消声量也小于手册中给出的数值,工程设计中应适当增加其有效长度才能满足消声量要求。 展开更多
关键词 微穿孔板 消声器 消声量 检测
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