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  • New designs of ventricular catheters for hydrocephalus by 3-D computational fluid dynamics

    Final Number:
    177

    Authors:
    MARCELO GALARZA MD MSC; Angel Gimenez; Olga Pellicer; Juan Valero; Jose M Amigo

    Study Design:
    Laboratory Investigation

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2014 Annual Meeting

    Introduction: Based on a landmark study by Lin et al. of the two-dimensional flow in ventricular catheters (VC) via computational fluid dynamics (CFD), we studied in a previous paper the three-dimensional flow patterns of five commercially available VC. We calculated that most of the total fluid mass flows through the catheter’s most proximal holes. In this paper we design five VC prototypes with equalized flow characteristics.

    Methods: We study five prototypes of VC by means of CFD in three-dimensional (3-D) automated models and compare the fluid-mechanical results with our previous study of currently in use VC. The general procedure for the development of a CFD model calls for transforming the physical dimensions of the system to be studied into a virtual wire-frame model which provides the coordinates for the virtual space of a CFD mesh. The incompressible Navier-Stokes equations, a system of strongly coupled, nonlinear, partial differential conservation equations governing the motion of the flow field, are then solved numerically.

    Results: By varying the number of drainage holes and the ratio hole/segment, whether with a simple or tapered hole type, we obtained improved flow characteristics in five prototypes of VC. In particular, we equalized the flow pattern through the different hole segments of the new VC prototypes, as disclosed by 3-D CFD.

    Conclusions: New catheter designs with variable hole diameter, number of holes, and ratio hole/segment along the catheter allow the fluid to enter the catheter more uniformly along its length, thus reducing the chance of its becoming occluded.

    Patient Care: New development of ventricular catheter for the treatment of hydrocephalus

    Learning Objectives: Describe the importance of 3D simulation in neurosurgical designs

    References:

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