. Drainage can be (1) serous (clear and thin; may be present in a healthy, healing wound), (2) serosanguineous (containing blood; may also be present in a healthy, healing wound), (3) sanguineous (primarily blood), or (4) purulent (thick, white, and pus-like; may be. Wound Drains Closed Wound Drain System A closed wound drain system has mechanisms in place to prevent the interaction between the wound/exudate and the external environ-ment. Flat drains are available with or without a trocar. . Point the top of the bulb away from you and remove the stopper.

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. . Step 1. Abstract.

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