Prototype of Brain Retraction Monitoring System : Pressure Receiver of Air Packed Type

Abstract

Brain retraction is a necessary and important proceduse for skull base surgery, but excessive and prolonged pressure during the operation can cause serious postoperative complications. In fact, because it is almost imposible to gauge the retracting pressure during an operation, a practical means by which to measure it is essential. In response to this need, the authors have invented a pressure receiver called a "pressure receiver of air packed type"to measure retracting pressure. This air packed pressure receiver is inexpensive, easy to make, and easily fits onto almost all types of retractors. Facilitating its use during sensitive manipulation is its use of air as a medium to indicate pressure. Because it uses air instead of water, no calibration or readjustment subsequent to each movement of the retractor is needed. Furthermore, we developed a calibration test especially for the pressure receiver, which has proven its accuracy. The polyester of the pressure receiver is 0.035mm thich, and when injected with air the inflated pressure receiver still measures only 1mm, so as not to impede surgical procedures. Finally practical unobtrusive and precise measurement of retracting pressure under clinical conditions is possible.