Skip to main content
Log in

Measurement of the effect of an enclosed volume of air on the compressibility of a simulated cranial cavity

  • Published:
Medical and biological engineering Aims and scope Submit manuscript

Abstract

The ability of an air sac placed in the intrancranial fluid spaces to absorb pressure pulses across the brain has been demonstrated by means of a mechanical model of the cranial cavity.

A two-fold pressure reduction occurred when 20 ml of air at atmospheric pressure was placed in the cranial cavity (simulated). A progressive decrease in effectiveness with increasing volume was noted, 50 ml being the effective maximum value.

Sommaire

On a démontré à l'aide d'un modèle mécanique de la cavité crânienne qu'un sac d'air situé dans les espaces du fluide intercrânien est capable d'absorber les pulsations de pression sur tout le cerveau. Une réduction de moitié de la pression fut observée lorsque 20 ml d'air à la pression atmosphérique était introduit dans la cavité crânienne (simulation). Une diminution progressive de l'efficacité fut notée avec l'augmentation du volume, l'efficacité maximum étant située à 50 ml.

Zusammenfassung

An einem mechanischen Modell des Hirnhohlraums wurde gezeigt, inwiefern ein Luftsack, der in die im Innern des Schädels gelegenen, mit Flüssigkeit ausgefüllten Räume eingesetzt nachdem 20 ml Luft mit atmosphärischem Druck in den kranialen Hohlraum (simuliert) gegeben wurden. Bei wachsendem Volumen war eine progressive Abnahme in der Leistungsfähigkeit zu verzeichnen, wobei 50 ml den effektiven Maximalwert darstellten.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

Abbreviations

D :

Et 3/12(1−σ2)

E :

Young's modulus

h :

deflection

K T :

bulk modulus at constant temperature

m :

mass

P :

pressure

r :

radius

t :

diaphragm thickness

T :

temperature

v :

volume

w :

load per unit area

γ:

ratio of specific heats

ρ:

density (=m/v)

σ:

Poisson's ratio

a :

atmospheric

c :

critical

f :

final

i :

injected

r :

resting

References

  • Lewer Allen, K. (1971) A study of the pressure of the cerebrospinal fluid in man by remote monitoring through the skull. CSIR Symposium on Biotelemetry, Pretoria.

  • Morley, A. (1943)Strength of materials. Longmans, 9th edn., 459.

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Bunt, E.A., Pastoll, G., Smoleniec, J. et al. Measurement of the effect of an enclosed volume of air on the compressibility of a simulated cranial cavity. Med. & biol. Engng. 14, 316–320 (1976). https://doi.org/10.1007/BF02478128

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02478128

Keywords

Navigation