Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-12-22
2000-04-25
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604111, 604218, A61M 500
Patent
active
060538929
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hypodermic syringe head with a tamper-evident closure for a syringe barrel, which has a barrel neck that is provided with an axial fluid outlet conduit and a circumferential bead for anchoring the hypodermic syringe head, having an injection cannula, which is mounted in a cannula carrier from which it protrudes on both axial ends and which is disposed in a cannula carrier guide so as to be movable relative thereto, and a cannula guard cap which is adjoined, via a rated breaking point, by an anchoring element that solidly holds the cannula carrier guide and can be affixed with elastic deformation to the circumferential bead of the barrel neck, and the cannula guard cap has axially extending ribs on its inside circumference which engage corresponding ribs of the cannula carrier for rotationally driving it.
2. Description of the Prior Art
One such hypodermic syringe head is intended to close so-called ready-to-use syringes, that is, syringes that are filled with a liquid medication and packed in sterile form, with an injection cannula, and are sold ready for use. It is understood that these ready-to-use syringes are provided with a tamper-evident closure, which makes it possible to see whether the syringe is still filled with the original contents and is still sterile. The hypodermic syringe head is intended to protect the cannula adequately so that upon final mounting of the syringe head on the syringe barrel, no damage to or contamination of the cannula can occur. For the sake of mass production, a simple construction of the hypodermic syringe is also necessary.
In one hypodermic syringe head of the type defined at the outset above, the problem also arises that if the guard cap is unintentionally twisted the wrong direction relative to the anchoring element, the rated breaking point will indeed break but the cannula will now be forced through the sealing disk and put into communication with the medication contained in the syringe barrel.
SUMMARY OF THE INVENTION
The object of the invention is to create a hypodermic syringe head which in conjunction with conventional syringe barrels forms a ready-to-use syringe that can not only be constructed simply and under sterile conditions and provided with a tamper-evident closure, but also in which provisions are taken to prevent mistakes in use with the deleterious effects described.
The subject of the invention is a hypodermic syringe head with a tamper-evident closure for a syringe barrel, which has a barrel neck that is provided with an axial fluid outlet conduit and a circumferential bead for anchoring the hypodermic syringe head, having an injection cannula, which is mounted in a cannula carrier from which it protrudes on both axial ends and which is disposed in a cannula carrier guide so as to be movable relative thereto, and a cannula guard cap which is adjoined, via a rated breaking point, by an anchoring element that solidly holds the cannula carrier guide and can be affixed with elastic deformation to the circumferential bead of the barrel neck, and the cannula guard cap has axially extending ribs on its inside circumference which engage corresponding ribs of the cannula carrier for rotationally driving it, wherein embodied on the circumference of the cannula carrier are two axially symmetrical guide grooves for a guide peg, provided in the interior of the cannula carrier guide, which extend with a predetermined inclination substantially in a V and open into one another on their end oriented toward the sealing disk, and the guide peg, in the unactuated state of the hypodermic syringe head, engages the orifice region, oriented toward the sealing disk, of the guide grooves and upon a rotation of the cannula guard cap in each of the two directions of rotation slides relative to one of the two guide grooves, destroying the rated breaking point, so that the cannula carrier is rotated and moved together with the cannula relative to the sealing disk, wherein an axial introduction
REFERENCES:
patent: 3333682 (1967-08-01), Burke
patent: 4820275 (1989-04-01), Haber et al.
patent: 5250037 (1993-10-01), Bitdinger
Becton Dickinson France S.A.
Yasko John D.
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