@article{oai:nagoya.repo.nii.ac.jp:00016534,
 author = {WATANABE, KAZUYUKI},
 issue = {2},
 journal = {Nagoya Journal of Medical Science},
 month = {Sep},
 note = {The intracranial pressure is one of the important vital signs in the field of clinical neurology and neurosurgery. The author reports about the newly designed device which measures the intracranial pressure continuously and directly in the closed system with a pressure transducer using a semi-conductor strain gage which was developed by Igarashi of Toyota Central Research and Development Laboratories, Inc. The pressure transducer is a small disc of 5 mm in diameter and 1.5 mm in thickness. Its output power is 0.24 mV to the pressure of 100mmH2O, and it is recorded after amplifying. Using the device, it is possible to measure the absolute value of intracranial pressure and to record the plethysmograph of the brain surface. The satisfactory results have been obtained in the animal as well as in clinical measurements of intracranial pressure. In clinical measurement, two kinds of plethysmograph were observed: one is the wave caused by respiration and the other is the wave caused by pulsation. The changes of these waves have important physiological significances. On the other hand, the absolute intracranial pressure also changed very quickly and largely by coughing, forced respiration, or the other changes of the condition of the measuring subject. The author has also described that, in the near future, it will become practical to measure the intracranial pressure by telemetering using this device.},
 pages = {207--242},
 title = {A New Method for Direct and Continuous Recording of the Brain Tension and the Cerebral Plethysmograph},
 volume = {31},
 year = {1968}
}