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Acta Neurochirurgica

, Volume 160, Issue 7, pp 1305–1309 | Cite as

Suction forces generated by passive bile bag drainage on a model of post-subdural hematoma evacuation

  • Steven O. Tenny
  • William E. Thorell
Original Article - Brain Injury
  • 87 Downloads

Abstract

Background

Passive drainage systems are commonly used after subdural hematoma evacuation but there is a dearth of published data regarding the suction forces created. We set out to quantify the suction forces generated by a passive drainage system.

Method

We created a model of passive drainage after subdural hematoma evacuation. We measured the maximum suction force generated with a bile bag drain for both empty drain tubing and fluid-filled drain tube causing a siphoning effect. We took measurements at varying heights of the bile bag to analyze if bile bag height changed suction forces generated.

Results

An empty bile bag with no fluid in the drainage tube connected to a rigid, fluid-filled model creates minimal suction force of 0.9 mmHg (95% CI 0.64–1.16 mmHg). When fluid fills the drain tubing, a siphoning effect is created and can generate suction forces ranging from 18.7 to 30.6 mmHg depending on the relative position of the bile bag and filled amount of the bile bag. The suction forces generated are statistically different if the bile bag is 50 cm below, level with or 50 cm above the experimental model.

Conclusion

Passive bile bag drainage does not generate significant suction on a fluid-filled rigid model if the drain tubing is empty. If fluid fills the drain tubing then siphoning occurs and can increase the suction force of a passive bile bag drainage system to levels comparable to partially filled Jackson-Pratt bulb drainage.

Keywords

Suction force Drain Subdural hematoma Bile bag 

Abbreviations

PTFE

polytetrafluoroethylene

JP

Jackson-Pratt

Notes

Funding

The Lyal G. Leibrock, MD Chair of Neurosurgery Fund provided financial support in the form of unrestricted money to purchase the supplies and equipment used in this research project. The sponsor had no role in the design or conduct of this research.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Neurosurgery, Department of SurgeryUniversity of Nebraska Medical CenterOmahaUSA

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