There is a constant need for negative baric pressure suction apparatus in neurosurgical practice. This drainge unit should be able to drain fluid into a sterile and closed reservoir. We have studied a technique employing the Wangensteen suction apparatus for postoperative drainage in craniotomy patients particularly patients with subdural hematomas and patients having possibility of subgaleal hematomas. The advantages of this technique are; 1) Local postoperative complications such as hematoma, secondary infections and skin flap necrosis are reduced. 2) This technique leads to decrease in healing time. 3) Bulky bandages and redressing can be avoided. 4) It is a simple, economic and readily available technique. 5) The study of the suctions inside the transparent tubes gives good informations about the local situation in the wound.