Spinal marker needle

Details Spinal marker needle Spinal marker needle

1990-12-26

1993-03-23

Green, Randall L.

Surgery

Truss

Pad

604117, 604116, 604182, 604201, 604232, 604272, A61M 502, A61M 500

Patent

active

051955261

ABSTRACT:
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.

REFERENCES:
patent: 2590895 (1952-04-01), Scarpellino
patent: 4197846 (1986-04-01), Bucalo
patent: 4774948 (1988-10-01), Markham
patent: 4834704 (1989-05-01), Reinicke
patent: 4940458 (1990-07-01), Cohn
patent: 4985019 (1991-01-01), Michelson

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