Some aspects of measuring intracranial pressure.

The problem of measurement of intracranial pressure in the epidural space is discussed in the light of the authors' own experience. Three forms of transducers have been used consecutively: (1) a capsular form which slides into the epidural space, (2) a screw-shaped form, fixed firmly in a burr hole and (3) a cylindrical tape, designed to be fixed in a burr hole with the aid of a protective socket. The zero point may be adjusted during measurement. The merits and disadvantages of these three types of transducer, as well as the practical problems connected with their use are discussed.