Syringe delivery system for dispensing a dental composite or other highly viscous material
First Claim
1. A syringe delivery system for dispensing a viscous material through a syringe opening comprising:
- a syringe barrel having an outer gripping surface that is at least partially exposed during use, a hollow inner chamber for holding therein a viscous material to be delivered, and a delivery opening at a delivery end of said syringe barrel in communication with said hollow inner chamber;
a threaded nut attached to or forming part of said syringe barrel;
a plunger including a threaded shaft that threadably engages said threaded nut and which is at least partially disposed within said hollow inner chamber of said syringe barrel for selective advancement within, and dispensing of a viscous material from, said hollow inner chamber through the delivery opening;
a plunger gripping member in gripping communication with said plunger comprised of a hollow sheath that is rotatable relative to the syringe barrel and which encloses said threaded shaft of said plunger and a portion of said outer gripping surface of said syringe barrel, said hollow sheath enclosing a portion of said outer surface of said syringe barrel as said plunger is advanced within said hollow inner chamber; and
a dynamic seal comprised of a flexible elastomer material integrally formed on an inner surface of said hollow sheath that engages said outer surface of said syringe barrel, said dynamic seal remaining fixed relative to said hollow sheath and rotating relative to said syringe barrel as the sheath and barrel are rotated relative to each other, said dynamic seal remaining in contact with said outer surface of said syringe barrel to thereby maintain a seal between said hollow sheath and said outer surface of said syringe barrel so as to prevent entrance or contamination by foreign matter.
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Accused Products
Abstract
A syringe delivery system for dispensing a highly viscous material through a syringe delivery opening. The system includes a syringe barrel having a delivery opening, a plunger including a threaded shaft that threadably engages the syringe barrel for selectively dispensing a viscous material through the delivery opening, and a plunger gripping member in gripping communication with the plunger that includes means for sealing the threaded shaft of the plunger so as to prevent contamination by foreign matter. According to one embodiment, a sheath may be included that covers the threaded shaft of the plunger so as to hide the plunger beneath the sheath. The sheath provides a sealed environment for the threaded shaft so as to prevent entrance or contamination by foreign matter.
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Citations
25 Claims
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1. A syringe delivery system for dispensing a viscous material through a syringe opening comprising:
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a syringe barrel having an outer gripping surface that is at least partially exposed during use, a hollow inner chamber for holding therein a viscous material to be delivered, and a delivery opening at a delivery end of said syringe barrel in communication with said hollow inner chamber; a threaded nut attached to or forming part of said syringe barrel; a plunger including a threaded shaft that threadably engages said threaded nut and which is at least partially disposed within said hollow inner chamber of said syringe barrel for selective advancement within, and dispensing of a viscous material from, said hollow inner chamber through the delivery opening; a plunger gripping member in gripping communication with said plunger comprised of a hollow sheath that is rotatable relative to the syringe barrel and which encloses said threaded shaft of said plunger and a portion of said outer gripping surface of said syringe barrel, said hollow sheath enclosing a portion of said outer surface of said syringe barrel as said plunger is advanced within said hollow inner chamber; and a dynamic seal comprised of a flexible elastomer material integrally formed on an inner surface of said hollow sheath that engages said outer surface of said syringe barrel, said dynamic seal remaining fixed relative to said hollow sheath and rotating relative to said syringe barrel as the sheath and barrel are rotated relative to each other, said dynamic seal remaining in contact with said outer surface of said syringe barrel to thereby maintain a seal between said hollow sheath and said outer surface of said syringe barrel so as to prevent entrance or contamination by foreign matter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A syringe delivery system for dispensing a viscous material through a syringe opening comprising:
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a syringe barrel having an outer gripping surface that is at least partially exposed during use, a hollow inner chamber for holding therein a viscous material to be delivered, a delivery opening at a delivery end of said syringe barrel in communication with said hollow inner chamber, and a cylindrical distal end opposite said delivery end; a threaded nut attached to or forming part of said syringe barrel; a plunger including a threaded shaft that threadably engages said threaded nut and which is at least partially disposed within said hollow inner chamber of said syringe barrel for selective advancement within, and dispensing of a viscous material from, said hollow inner chamber through the delivery opening; a plunger gripping member in gripping communication with said plunger comprised of a hollow sheath that is rotatable relative to the syringe barrel and which encloses said threaded shaft of said plunger and said cylindrical distal end of said syringe barrel so as to shield said plunger and said cylindrical distal end within said hollow sheath, said hollow sheath enclosing a portion of said cylindrical distal end of said syringe barrel as said plunger is advanced within said hollow inner chamber; and a dynamic seal comprised of a flexible elastomer positioned so as to rotate relative to said sheath or said syringe barrel as the sheath and barrel are rotated relative to each other, said dynamic seal remaining in contact with said sheath and said outer surface of said syringe barrel to thereby maintain a seal between said hollow sheath and said outer surface of said syringe barrel and thereby prevent entrance or contamination by foreign matter, said sheath being enlarged in cross section relative to a cross-section of said syringe barrel so as to facilitate relative rotation of said sheath and said syringe barrel; wherein said sheath provides a protective environment for said threaded shaft. - View Dependent Claims (21, 22, 23)
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24. A syringe delivery system for dispensing a viscous material through a syringe opening comprising:
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a syringe barrel having a delivery opening; a plunger including a threaded shaft that threadably engages said syringe barrel for selective dispensing of a viscous material through the delivery opening; and a plunger gripping member in gripping communication with said plunger that includes a sheath that covers said threaded shaft of said plunger so as to shield said plunger beneath said sheath; wherein said sheath includes at least one level indicator window and said threaded shaft includes at least one level indicator tab that rides within at least one groove formed on an inside surface of said sheath, said at least one groove being adjacent to said level indicator window. - View Dependent Claims (25)
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Specification