Child; Trauma; Vacuum sealing drainage; Soft tissue injuries.
儿童，创伤，负压封闭引流，软组织损伤。
Generally use the soft rubber type sealing ring seal, hard seal ring-type metal seal used.
软密封型一般采用橡胶环密封，硬密封型通常采用金属环密封。
It has two form sealing type: soft and hard seal.
密封形式有软密封和硬密封两种。
Objective To investigate the effect of vacuum sealing drainage on severe soft tissue injury treatment.
目的观察负压封闭引流技术对严重软组织损伤的临床疗效。
Adopt union brass sealing piece, have soft hard sealed effect, make better top sealing performance.
采用一体铜制密封件，形成有效软硬密封效果，使上部密封性能更强。
The sealing structure can be divided into soft-seal and hard seal structure.
其密封结构可以分软密封、硬密封结构。
The soft-sealing gate valve is also used as flow adjusting valve.
橡胶闸阀并可做流量调节阀使用。
The soft-sealing gate valve is also used as flow adjusting valve.
橡胶闸阀并可做流量调节阀使用。
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