Dual diameter needle with a smooth transition

Details Dual diameter needle with a smooth transition Dual diameter needle with a smooth transition

A - Human Necessities

61

M

A61M 5/32 (2006.01) A61M 25/06 (2006.01)

Patent

CA 2051273

A needle cooperates with a tip cover that coaxially fits about the needle and slides axially relative thereto. A thin walled tube of the needle has a shank portion extending from the proximal end toward the distal end and a tip portion extending from the distal end toward the proximal end. The tip portion has a diameter that is larger than the diameter of the shank portion. The needle includes a transition zone between the shank and tip portions wherein the axial distance of the transition zone is about an order of magnitude greater than the difference in the diameters of the tip and shank portions. The tip portion includes a bevel extending from the distal end toward the transition zone as a sharpened edge to ease insertion. The cover includes a bearing and a tip protecting part. The bearing is sized to coaxially fit about the shank portion and slide axially relative thereto. The difference in the diameters of the tip and shank portions is such that the bearing can not slide distally over the transition zone. The cover is positioned on the needle to locate the tip protecting part over the sharpened edge when the bearing is at the transition zone. The transition zone is shaped frusto conically and is located - between the shank and tip portions. The frusto conical shape is at angle relative to the axis of the needle due to a difference in the first and second diameters thus providing a diametrical imperceptible change.

Une aiguille s'insère dans un étui de pointe qui s'ajuste coaxialement autour de l'aiguille et glisse axialement relativement à cette dernière. Un tube à mince paroi de l'aiguille comporte un corps se prolongeant de l'extrémité proximale vers l'extrémité distale, et une pointe se prolongeant de l'extrémité distale vers l'extrémité proximale. Le diamètre de la pointe est plus grand que celui du corps. L'aiguille comprend une section de transition, entre le corps et la pointe, dont la distance axiale est environ un ordre de grandeur plus grande que la différence entre les diamètres de la pointe et du corps. La pointe comporte un biseau, comme bord tranchant, se prolongeant de l'extrémité distale vers la section de transition pour faciliter la pénétration de l'aiguille. L'étui comprend un coussinet et une partie protégeant la pointe. Le coussinet est dimensionné pour s'ajuster coaxialement autour du corps et glisser axialement relativement à ce dernier. La différence entre les diamètres de la pointe et du corps est telle que le coussinet ne peut pas glisser distalement le long de la section de transition. L'aiguille est insérée dans l'étui de façon à placer la partie protégeant la pointe par-dessus le bord tranchant lorsque le coussinet est à la section de transition. Cette section de transition, de forme tronconique, se trouve entre le corps et la pointe. La forme tronconique est inclinée relativement à l'axe de l'aiguille en raison de la différence entre les premier et second diamètres, ce qui permet d'obtenir un changement diamétral imperceptible.

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