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A disposable syringe with protection against reuse is proved. The syringe includes a cylinder with an injection nozzle and a piston that has a piston section facing the injection nozzle, a piston rod and an actuation section facing away from the piston section, wherein the piston rod has a latching section with a shoulder that is provided in or on the piston rod and runs radially inward, the cylinder has a counter-latching section protruding inward, and the piston has at least one predetermined breaking point in such a way that when the piston rod is introduced into the cylinder the counter-latching section engages behind the shoulder to lock it and counteracts removal the piston rod from the cylinder, and wherein the predetermined breaking point is designed such that it breaks when pulling on the actuation section.

Titel:	DISPOSABLE SYRINGE WITH PROTECTION AGAINST REUSE
Autor/in / Beteiligte Person:	Eccard, Monika
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2010
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20100268160 Publication Date: October 21, 2010 Appl. No: 12/631572 Application Filed: December 04, 2009 Assignees: CET Consulting Engineering Trading Monika Eccard (Kemen, DE) Claim: 1. A disposable syringe with protection against reuse, comprising a cylinder with an injection nozzle and a piston that has a piston section facing the injection nozzle, a piston rod and an actuation section facing away from the piston section, wherein the piston rod has a latching section with a shoulder that is provided in or on the piston rod and runs radially inward, the cylinder has a counter-latching section protruding inward, and the piston has at least one predetermined breaking point in such a way that when the piston rod is introduced into the cylinder the counter-latching section engages behind the shoulder to lock it and counteracts removal the piston rod from the cylinder, and wherein the predetermined breaking point is designed such that it breaks when pulling on the actuation section. Claim: 2. The disposable syringe according to claim 1, characterized in that the counter-latching section rests under pretension against the piston rod during at least most of the insertion path of the piston. Claim: 3. The disposable syringe according to claim 1, characterized in that the latching section rests under pretension against the counter-latching section during a section of the insertion path of the piston, wherein in order to produce the pretension the latching section comprises a chamfer which is bounded by the shoulder on a side facing the actuation section, whereby the chamfer has a length (l1) extending in the axial direction that amounts at least to 1.5 times, preferably at least five times, and more preferred at least ten to twenty times the height (h) of the chamfer extending in the radial direction. Claim: 4. The disposable syringe according to claim 3, characterized in that the length (l1) of the chamfer corresponds to at least one tenth of the length (l2) of the piston rod with the piston section. Claim: 5. The disposable syringe according to claim 3, characterized in that the counter-latching section is provided in a cylinder section that has a larger inside diameter compared to the main cylinder section of the cylinder. Claim: 6. The disposable syringe according to claim 2, characterized in that the counter-latching section is designed to be resilient at least in some sections in the radial direction in order to produce the pretension. Claim: 7. The disposable syringe according to claim 6, characterized in that the counter-latching section comprises at least one flexible tongue, which is designed to be resilient in the radial direction and extends in the axial direction, in order to produce the pretension, said tongue having a partial section protruding radially inward and interacting with the shoulder. Claim: 8. The disposable syringe according to claim 3, characterized in that the latching section and/or the chamfer of the latching section are designed to be resilient in the radial direction and/or in a direction running transversely to the longitudinal direction in order to produce the pretension. Claim: 9. The disposable syringe according to claim 1, characterized in that the predetermined breaking point is located between the piston rod and the actuation section. Claim: 10. The disposable syringe according to claim 1, characterized in that the piston rod and/or the actuation section comprise contact sections interacting with each other and designed separately from the predetermined breaking point in such a way that bending or breaking of the predetermined breaking point is prevented when the piston is pressed in. Claim: 11. The disposable syringe according to claim 10, characterized in that the contact sections have a surface area running approximately or exactly perpendicularly and/or parallel to the center longitudinal axis of the piston. Claim: 12. The disposable syringe according to claim 10, characterized in that the contact sections of the piston rod and the actuation section are both designed conically and run at least substantially parallel to each other. Claim: 13. The disposable syringe according to claim 10, characterized in that contact sections are provided in the area around the predetermined breaking point. Claim: 14. The disposable syringe according to claim 1, characterized in that the piston has at least two predetermined breaking points designed as connection surfaces which are disposed at a distance from each other, preferably within a plane running orthogonal to the center longitudinal axis of the piston. Claim: 15. The disposable syringe according to claim 1, characterized in that the piston has a predetermined breaking point designed as a center connection surface at a center region of a cross-sectional surface of the piston rod, wherein the center connection surface is preferably disposed within the plane running orthogonal to the center longitudinal axis of the piston. Claim: 16. The disposable syringe according to claim 1, characterized in that a distance between the predetermined breaking points amounts to at least half of a radius of the piston rod. Claim: 17. The disposable syringe according to claim 1, characterized in that the piston rod and/or the actuation section at least in some sections of the cross-section are composed of several, preferably four, segments protruding radially in a star shape from the center longitudinal axis. Claim: 18. The disposable syringe according to claim 1, characterized in that the piston section, the piston rod, the actuation section and the latching section are connected to each other in a single piece and/or the cylinder and the counter-latching section are connected to each other in a single piece. Current U.S. Class: 604/110 Current International Class: 61

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DISPOSABLE SYRINGE WITH PROTECTION AGAINST REUSE