Chongqing Shanwaishan Science & Technology Co., Ltd was established in 2001 and located In Chongqing, China. It is a high-tech enterprise which specializes in blood purification equipment design, manufacture, sales and technical service. Now it has become the largest and most advanced blood purification manufacturing enterprise in China. SWS has owned independent knowledge rights. It is the only one blood purification technical center in China, drafted and established 3 items of national standard and 3 items of industry standard in China blood purification field. SWS company has already passed CMD (ISO13485: 2003) quality system certificate, SFDA certificate and CE certificate. It has been appraised as the excellent enterprise of standardized management by national standards commission. In China, Our company has owned the largest national blood purification project research center. We have developed the first continuous blood purification system (CRRT), online hemodiafiltration equipment and predominate the production of core technology in blood purification equipment. Now we have developed 8 types products of three systems which including the hemoperfusion equipment, continuous blood purification system (CRRT) and hemodialysis equipment. And the famous hemodialysis system has 3 different types which include SWS-4000, SWS-4000A and SWS-4000B.