INJECTION DEVICE
First Claim
1. A injection device comprising:
- a needle assembly comprising a cannula and a luer connector engageable with a distal end of a syringe, said cannula having a rounded distal tip and an outlet spaced apart from said tip, and said luer connector comprising a hub with a distal end supporting said cannula and a proximal end mateable with the syringe distal end;
a cavity, defined by a stepped interior surface of the hub, effective to prevent detachment of said hub from the syringe distal end during ejection of a viscous fluid from the cannula outlet when the hub is engaged to the syringe distal end; and
external threads disposed on an exterior surface of said hub enabling mating engagement between the hub and the syringe distal end.
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Accused Products
Abstract
An injection device includes a syringe having a body with a piston disposed therein with an open end along with a viscous fluid disposed in the body for injection by the piston. A needle assembly is provided which includes a cannula, for example a blunt tipped cannula, having a luer connection engageable with the syringe distal end with the luer connector including a hub. Mating engagement is provided by way of internal threads at the syringe distal end and external treads of a hub with a pitch sufficient to prevent detachment of the hub from the syringe distal end during ejection of the viscous fluid. In addition, a stepped cavity, disposed in the hub, further prevents detachment of the hub from the syringe distal end during ejection of the viscous fluid.
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Citations
20 Claims
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1. A injection device comprising:
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a needle assembly comprising a cannula and a luer connector engageable with a distal end of a syringe, said cannula having a rounded distal tip and an outlet spaced apart from said tip, and said luer connector comprising a hub with a distal end supporting said cannula and a proximal end mateable with the syringe distal end; a cavity, defined by a stepped interior surface of the hub, effective to prevent detachment of said hub from the syringe distal end during ejection of a viscous fluid from the cannula outlet when the hub is engaged to the syringe distal end; and external threads disposed on an exterior surface of said hub enabling mating engagement between the hub and the syringe distal end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An injection device comprising:
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a syringe having a body with a piston disposed therein and a distal end; a needle assembly comprising a cannula and a luer connector engageable with the syringe distal end, said cannula having a rounded distal tip and an outlet spaced apart from said tip, and said luer connector comprising a hub with a distal end supporting said cannula and a proximal end mateable with the syringe distal end; a cavity, defined by a stepped interior surface of the hub, effective to prevent detachment of said hub from the syringe distal end during ejection of a viscous fluid from the cannula outlet when the hub is engaged to the syringe distal end; and external threads disposed on an exterior surface of said hub enabling mating engagement between the hub and the syringe distal end. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification