Document Detail

Chronic measurement of epidural pressure with an induction-powered oscillator transducer.
MedLine Citation:
PMID:  1255235     Owner:  NLM     Status:  MEDLINE    
An induction-powered oscillator transducer (IPOT) was designed for the chronic measurement of epidural pressure. The transducer was completely implantable so all pressure measurements were made through the intact skin. The IPOT had a linear pressure range from -50 to +200 cm H2O, was sensitive to 1 mm H2O and had a zero drift of less than 1 mm H2O/day under full load. Zero drift was minimized by using a hermetically-sealed metal bellows transducing element which was chemically treated to prevent corrosion and creep. The correlation between epidural pressure and intraventricular pressure was determined during the first 24 hours after implantation in six dogs. Epidural pressure was found to be a linear function of intraventricular fluid pressure. Epidural pressure and intraventricular pressure were essential equal provided the epidural wedge pressure was minimized by proper insertion of the transducer. The correlation between epidural pressure and intraventricular pressure was determined after chronic implantation in five dogs. Epidural pressure was a linear function of intraventricular pressure in the chronically implanted dogs, but epidural pressure was not equal to intraventricular pressure. After chronic implantation, the epidural pressure transducer was not responsive to changes in intraventricular pressure because of mechanical changes in the dura. The dura became stiff and non-compliant. Maximum correlation between epidural pressure and intraventricular fluid pressure in chronic implantations will depend on judicious material selection and mechanical design at the transducer-dura interface.
H G Rylander; H L Taylor; J P Wissinger; J L Story
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of neurosurgery     Volume:  44     ISSN:  0022-3085     ISO Abbreviation:  J. Neurosurg.     Publication Date:  1976 Apr 
Date Detail:
Created Date:  1976-05-25     Completed Date:  1976-05-25     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0253357     Medline TA:  J Neurosurg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  465-78     Citation Subset:  AIM; IM; S    
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MeSH Terms
Cerebral Ventricles / physiology
Electrodes, Implanted
Electronics, Medical*
Intracranial Pressure*
Monitoring, Physiologic / instrumentation*
Subarachnoid Space / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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