Operative surgery . d, unlessgreat caution be exercised in the use. The diameters of these instrumentsvary from one half inch to two inches and a half. Circular craniotomy witha trephine of small caliber is commonly practiced for relief of depressed frac-ture of the cranium and epidural haemorrhage. The large sizes are used inoperations for brain tumors. Craniotomy for Fracture of the Skull.—Circular craniotomy is commonlypracticed for this injury. The field of operation is prepared by cutting thehair short, scrubbing and disinfecting the scalp, and shaving it for a consid-erable distance arou
Operative surgery . d, unlessgreat caution be exercised in the use. The diameters of these instrumentsvary from one half inch to two inches and a half. Circular craniotomy witha trephine of small caliber is commonly practiced for relief of depressed frac-ture of the cranium and epidural haemorrhage. The large sizes are used inoperations for brain tumors. Craniotomy for Fracture of the Skull.—Circular craniotomy is commonlypracticed for this injury. The field of operation is prepared by cutting thehair short, scrubbing and disinfecting the scalp, and shaving it for a consid-erable distance around the seat of the injury. The patient is anesthetizedif not completely unconscious, preferably with chloroform, as it causes lesscerebral excitement. However, the choice of an anesthetic is a matter ofopinion. The head is conveniently raised and supported by a firm pillow. The Operation of Circular Craniotomy (Trephining),—With a scalpel(Fig. 265, a) make an oval incision of the scalp, through sound tissue if 1. (
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