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Related Experiment Videos

Flow dynamics through spinal needles

M G Serpell1, W M Gray

  • 1Department of Anaesthesia, Western Infirmary, Glasgow, UK.

Anaesthesia
|March 1, 1997
PubMed
Summary
This summary is machine-generated.

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Different spinal needles create distinct dye flow patterns during injection. Whitacre needles produce angled, directional streams, while Quincke needles yield straight, undeviated flow, impacting fluid dynamics in medical procedures.

Area of Science:

  • Neurosurgery
  • Fluid Dynamics
  • Medical Device Engineering

Background:

  • Understanding fluid dynamics during spinal procedures is crucial for accurate medication delivery.
  • Spinal needles vary in design, potentially influencing injection patterns and outcomes.
  • Previous research has not fully characterized flow patterns of different spinal needle types.

Purpose of the Study:

  • To investigate and compare the flow patterns of liquid dye injected through commonly used spinal needles.
  • To analyze how needle design (Whitacre vs. Quincke) affects dye dispersion and track formation.
  • To evaluate dye behavior when encountering an obstruction, simulating the spinal cord.

Main Methods:

  • Active injection of liquid dye into a fluid medium using five different spinal needles.

Related Experiment Videos

  • Observation of flow patterns at various flow rates.
  • Interposition of a perspex plate to simulate the spinal cord and assess dye dispersion.

    • Main Results:

    • Whitacre-type needles generated directional, angled dye streams, forming tracks at intermediate flow rates.
    • Quincke needles produced a consistently undeviated dye stream without track formation.
    • Dye dispersion was unidirectional from Whitacre needles and bidirectional from Quincke needles when encountering the plate.
    • At slower rates, dye formed a film on the plate; at faster rates, it dispersed turbulently for both needle types.

    Conclusions:

    • Spinal needle design significantly influences fluid dynamics and dye dispersion patterns.
    • Whitacre needles offer directional injection, potentially beneficial for targeted delivery.
    • Quincke needles provide a more central, undeviated flow, relevant for different applications.
    • These findings have implications for optimizing spinal injection techniques and device selection.