Insertion of new PEP composite foam into drainage tube<BR>The drainage tube and the new PEP composite foam material were covered on various wounds.<BR>Covering the wound with biological semipermeable membrane<BR>Cut off the built-in drainage tube and leak it out of the semipermeable membrane<BR>Connecting the drain tube and suction cup<BR>Connect negative pressure source and negative pressure machine<BR>Forming a complete negative pressure sealing system<BR>
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