Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-10-22
1992-03-31
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604274, A61M 500
Patent
active
051003902
ABSTRACT:
A needle hereafter referred to as a metal cannula is of thin-walled construction and designed with a solid noncutting pencil point possessing a tip with an elliptical side port located not more than 1 (one) cannula Outer Diameter (O.D.) length from the tip and via a hollow internal channel the axial length of the cannula is capable of guiding an inserted catheter through the cannula for projection laterally out of the cannula for subsequent indwelling placement of the introduced catheter upon removal of the cannula. The sideport is placed on the angled surface of the developing point so that it coincides with the angle of the pencil point. The elliptical sideport has a machined and polished rounded internal edge intersecting with the external surface. The construction of the cannula combining a large diameter with a pencil point and the location of an opening at the tip permits safe introduction of a spinal catheter into the subarachnoid space with minimum damage to tissues or membranes by either the cannula or a catheter exiting the sideport. The cannula is fitted with an obturator which coincides with the shape of the internal lumen of the cannula where the obturator tip curves upward to occlude the opening of the cannula sideport. The cannula of the present invention has application to subarachnoid and epidural regional anesthesia and pain management procedures. The present invention is designed preferably as a large gauge needle (17-21 gauge) so that it will accept insertion of a large flexible catheter (20 to 22 gauge in diameter) for indwelling placement.
REFERENCES:
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Butler Roberta C.
Lubeck Norma A.
Lubeck Norma A.
Rosenbaum C. Fred
Smith Chalin
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