• R K Baumgarten.
• Department of Anesthesia and Pain Management, Henry Ford Hospital, Detroit, MI 48202, USA.
• Reg Anesth. 1995 May 1;20(3):234-8.

Background And ObjectivesThe needle bevel has an important effect on the path that the needle takes as it traverses tissue. Many anesthesiologists, especially trainees, are unaware of the magnitude of this effect. There is a need for a model, constructed from readily available materials, that can be used to demonstrate the bevel effect and to assess various strategies for accurately advancing the needle.MethodsStyrofoam blocks were prepared. The following needles were studied: 25-gauge Quincke, 22-gauge Quincke, 18-gauge Quincke, 24-gauge Sprotte, 25-gauge Whitacre, 22-gauge Tuohy, and 17-gauge Tuohy. The effect of bevel orientation on deflection from midline was measured. Representative results were photographed.ResultsThe bevel has a significant effect on the path of Quincke and Tuohy needles. The deflection is more pronounced for thinner needles. Pencil-point needles show much less deflection than Quincke needles.ConclusionsStyrofoam blocks provide a model for teaching the basics of spinal and epidural anesthesia. By utilizing styrofoam the trainee can master needle control and gauge the effect of bevel orientation.

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