| 摘要 |
A radiographically opaque spinal marker needle having a lower portion consisting of a small bore hollow needle and an upper portion having a larger outside diameter. An intermediate penetration restriction member fixed to and surrounding the marker needle at a point proximate the junction of the upper portion and the lower portion limits the depth of penetration of the hollow needle into the patient or tissue, provides stability, and forms a large observable mass on an X-ray. In an alternative embodiment the larger upper bore portion is in the form of a syringe and includes a prefilled ampule of dye within the syringe for injection into the patient by a plunger assembly. The upper portion may be separable from the lower portion at a point above the pentration restriction member.
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