Patent ID: 7261559

Claim:
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.