Injection device
First Claim
1. An injection device for delivering a dermal filler, the device comprising:
- a syringe having (i) a body with a piston disposed therein and (ii) an open distal end portion including a tapered syringe cone;
a needle assembly comprising a cannula and a luer connector engageable with the syringe open distal end portion, said luer connector comprising a hub having an inner bore, the inner bore comprising a proximal retention section, a stepped section, and a cannula retention section, the proximal retention section being mateable with the syringe open distal end portion, the stepped section being smaller in diameter than the proximal retention section and being disposed intermediate the proximal retention section and the cannula retention section, the inner bore having a stepped section surface wherealong the inner bore decreases in diameter to a proximal end of a cannula retention surface of the cannula retention section, the inner bore not increasing in diameter from the proximal retention section to a distal end of the cannula retention section, the cannula retention section having a constant diameter, the cannula retention surface being mated against an outer surface of the cannula to secure the cannula within the cannula retention section; and
internal threads disposed in the syringe open distal end portion and external threads disposed on said hub enabling mating engagement between the hub and the syringe open distal end portion;
said hub having an inside surface of the proximal retention section comprising a wall correspondingly tapered to said tapered syringe cone and that includes a step extending normal to the wall, the step being spaced apart from a distal-most surface of the tapered syringe cone in a distal direction when the hub and the syringe cone are maximally seated thereby reducing dead space within the proximal retention section for preventing detachment of the hub from the tapered syringe cone during injection of a dermal filler contained in the syringe body.
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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 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 threads 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
26 Claims
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1. An injection device for delivering a dermal filler, the device comprising:
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a syringe having (i) a body with a piston disposed therein and (ii) an open distal end portion including a tapered syringe cone; a needle assembly comprising a cannula and a luer connector engageable with the syringe open distal end portion, said luer connector comprising a hub having an inner bore, the inner bore comprising a proximal retention section, a stepped section, and a cannula retention section, the proximal retention section being mateable with the syringe open distal end portion, the stepped section being smaller in diameter than the proximal retention section and being disposed intermediate the proximal retention section and the cannula retention section, the inner bore having a stepped section surface wherealong the inner bore decreases in diameter to a proximal end of a cannula retention surface of the cannula retention section, the inner bore not increasing in diameter from the proximal retention section to a distal end of the cannula retention section, the cannula retention section having a constant diameter, the cannula retention surface being mated against an outer surface of the cannula to secure the cannula within the cannula retention section; and internal threads disposed in the syringe open distal end portion and external threads disposed on said hub enabling mating engagement between the hub and the syringe open distal end portion; said hub having an inside surface of the proximal retention section comprising a wall correspondingly tapered to said tapered syringe cone and that includes a step extending normal to the wall, the step being spaced apart from a distal-most surface of the tapered syringe cone in a distal direction when the hub and the syringe cone are maximally seated thereby reducing dead space within the proximal retention section for preventing detachment of the hub from the tapered syringe cone during injection of a dermal filler contained in the syringe body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A needle assembly for an injection device for facilitating delivery of a dermal filler, the assembly comprising:
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a needle hub comprising an inner bore and a longitudinal axis, the inner bore having a proximal retention section, an intermediate section, and a cannula retention section, the proximal retention section having a tapered inner surface and a proximal step whereat the inner bore decreases in diameter to the intermediate section, the proximal step being formed by an intersection of a wall surface of the proximal retention section and an inner surface of the intermediate section, the wall surface of the proximal retention section extending perpendicular relative to the longitudinal axis, the intermediate section having a cannula step whereat the inner bore decreases in diameter to a proximal end of the cannula retention section, the proximal step being interposed between the tapered inner surface and the cannula step, the inner bore not increasing in diameter from the proximal retention section to a distal end of the cannula retention section, the cannula retention section having a constant diameter, the cannula step being formed by an intersection of a wall surface of the intermediate section and a cannula engagement surface of the cannula retention section; and a cannula having a proximal portion seated against the cannula retention section; wherein the proximal retention section and the intermediate section, when coupled with a distal end portion of a syringe, collectively reduce dead space within the inner bore for preventing detachment of the hub from the syringe during an injection procedure. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A needle assembly for an injection device for facilitating delivery of a dermal filler, the assembly consisting essentially of:
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a needle hub comprising an inner bore and a longitudinal axis, the inner bore having a proximal retention section, an intermediate section, and a cannula retention section, the proximal retention section having a tapered inner surface and a proximal step whereat the inner bore decreases in diameter to the intermediate section, the proximal step being formed by an intersection of a wall surface of the proximal retention section and an inner surface of the intermediate section, the wall surface of the proximal retention section extending perpendicular relative to the longitudinal axis, the intermediate section having a cannula step whereat the inner bore decreases in diameter to a proximal end of the cannula retention section, the proximal step being interposed between the tapered inner surface and the cannula step, the inner bore not increasing in diameter from the proximal retention section to a distal end of the cannula retention section, the cannula retention section having a constant diameter, the cannula step being formed by an intersection of a wall surface of the intermediate section and a cannula engagement surface of the cannula retention section; and a cannula having a proximal portion seated against the cannula retention section; wherein the proximal retention section and the intermediate section, when coupled with a distal end portion of a syringe, collectively reduce dead space within the inner bore for preventing detachment of the hub from the syringe during an injection procedure.
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Specification