Application of the coplanar principle to dynamic epidural pressure measurements.
The application of the coplanar principle to dynamic epidural pressure measurements was investigated in vitro. The authors used a coplanar pressure-displacement transducer, commonly employed to measure the viscoelastic properties of brain tissue in vivo. The present studies were performed using canine dura and a specially constructed fluid-filled chamber. The accuracy of the technique was assessed by comparing the pressure in the chamber recorded by the coplanar transducer to the pressure measured by a transducer directly vented to the chamber. The results show that the coplanar principle remained valid for dynamic measurements with the transducer under a variety of conditions.
D004824:Epidural Space; D006801:Humans; D007427:Intracranial Pressure; D008991:Monitoring, Physiologic / Q000295:instrumentation; D014159:Transducers