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建筑工地上,有些工人因工作需要,常常需要长时间地站立作业,尤其是站立负重作业,如不注意防护,容易导致下肢静脉曲张。下肢静脉分深、浅两组。深静脉位于肌间隙,浅静脉位于皮下。深、浅静脉之间有交通支沟通。深、浅静脉及交通支中都有瓣膜,其作用如单向的阀门,只许血流从下向上,从浅静脉向深静脉流动。人在站立时,作用力可使下肢静脉的血柱变直、延长,静脉内压力增大:长时间站立作业,会使下
On the construction site, some workers often need to stand for a long time due to work needs, especially standing weight-bearing work. If they do not pay attention to protection, they easily lead to varicose veins of the lower extremities. Lower extremity veins deep, shallow two groups. Deep vein located in the interosseous, superficial vein located in the skin. Between the deep and superficial veins have traffic communication. Deep, superficial veins and traffic branch has a valve, its role as one-way valve, only from the bottom of the blood flow, from the superficial vein to the deep vein flow. When standing, the force can straighten the blood vessels of the lower extremity veins, prolongation, increased pressure in the veins: standing for a long time, will make the next