B. Braun Melsungen Ag

Hans Haindl

One side wall of a rigid needle tube is provided at its front end with a curved bending directed towards the opposite, axial side wall and has a lumen opening formed therein. The lumen opening is provided with a rear inner cutting edge and a front punctuating portion which comprises a lancet-shaped tip having a facet grinding. The tip is arranged in a zone defined by two imaginary lines extending respectively from the inner surface and the outer surface of the axial side wall beyond the rear cutting edge of the lumen opening. When using the needle, no material is punched out of the material to be perforated.

Needle

A safety cap having radial projections which comprise a slide flank inclined in the peripheral direction relative to the longitudinal axis of the sleeve of the safety cap. The slide flanks are engaged by the longitudinal wings of the cannula hub, which wings fit tightly to the inner wall surface between the radial projections. Subject to the orientation of the peripherally inclined slide flank of each radial projection, the rotation of the safety cap loosely put together with the cannula hub causes a clamping lock in one direction or the other of the safety cap and the cannula hub by a mutual blocking of the radial projections and the longtiudinal wings, on the one hand, or an axial displacement of the safety cap from the cannula hub on the other hand. By a keying effect of the longitudinal wing of the cannula hub sliding over the oblique slide flank, the adhesion between the longitudinal wings and the inner wall surface is cancelled without a tractive effect endangering the connection of syringe cone and cannula hub, and the cannula is ready for use.

Safety cap

A retentive catheter having a cannula tube through which medications may be injected into a patient. A mandrin may be left in the retentive catheter during the injection. The medication is injected through an injection port and flows through a fluid channel between the mandrin and the cannula tube and is discharged from the cannula tube through a valve. The valve may be of the nonreturn type. The mandril tip prevents blood components from entering into the cannula tube. The protection against contamination is increased because the mandrin need not be removed from a proposed injection.

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Melsungen, Germany

Hans Haindl