Preliminary Evaluation of a Novel Intraparenchymal Capacitive Intracranial Pressure Monitor

K Aquilina, M Thoresen, E Chakkarapani, IK Pople, HB Coakham, RJ Edwards

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)


Background. Intracranial pressure (ICP) monitors are currently based on fluid-filled, strain-gauge or fibreoptic technology. Capacitive sensors have minimal zero drift and energy requirements, allowing long-term implantation and telemetric interrogation; their application to neurosurgery has only rarely been reported. Objective. Preliminary in vitro and in vivo evaluation of a capacitive telemetric implantable ICP monitor. Methods. (a) 5 devices were tested in air and saline-filled pressure chambers; long-term capacitance–pressure curves were obtained; (b) devices implanted in a gel phantom and in a piglet were placed in a 3 Tesla magnetic resonance (MR) scanner to evaluate MR compatibility; (c) 5 devices were implanted in a piglet neonatal hydrocephalus model; output was compared to ICP obtained through fluid-filled transduction and a strain-gauge ICP monitor. Results. (a) Capacitance–pressure relationship was constant over 3 weeks suggesting minimal zero drift during this period; (b) there were no temperature changes around the 3 monitor. Signal loss at the sensor was minimal in phantom and piglet; (c) over 114 000 measurements, difference between mean capacitive ICP and fluid-transduced ICP was 1.8 +/- 1.42 mmHg. Correlation between ICP from capacitive sensor and fluid-filled transducer (r=0.97, p
Translated title of the contributionPreliminary Evaluation of a Novel Intraparenchymal Capacitive Intracranial Pressure Monitor
Original languageEnglish
Pages (from-to)e-pub
Number of pages9
JournalJournal of Neurosurgery
Publication statusPublished - 2011

Bibliographical note

Other: e-pub 27 May 2011


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