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US 7,458,142 B2Granted
Method for producing a cannula used specially for a spinal anaesthesia
OwnerHans Haindlinventor
Life of this patent
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Abstract
Method of producing a cannula used specially for a spinal anesthesia. The cannula is provided with a rigid tube whose distal end comprises a zone or region which gradually tapers in the direction of a puncture or insertion point and a lateral exit orifice or aperture embodied therein. The deformation or bending of an angular zone makes it possible to produce the puncture point and the exit orifice in one stage.
Claims6
A method of fabricating a spinal anesthesia cannula, the method comprising:
- a) providing a rigid cannula tube including a 5 cylinder over its entire length;
- b) forming a tapering conical region from the cylindrical cannula tube by tapering the cylindrical cannula tube at a distal end;
- c) chamfering the distal end of the cannula tube on only one side right to its distal end to produce a chamfered region;
- d) producing edges in the chamfered region during the chamfering of the distal end;
- and
- e) bending the edges together to form and define a substantially conical envelope configured so that the edges touch each other at an outermost distal edge of the chamfered region and thus form an insertion point, but in a region there behind the edges are spaced from each other and thus form an outlet aperture of the cannula adjacent the insertion point.
3 more elements
Dependencies are inferred from the claim text.