Abstract: A threaded syringe provides a mechanism by which a clinician can deliver a viscous fluid through a relatively small lumen and can obtain tactile or audible feedback of delivery. The threaded syringe allows for delivery of more viscous fluids with less force and/or allows for more controlled delivery. The syringe includes a syringe barrel and a sliding member positioned on the proximal end of the syringe barrel. The sliding member has a first threaded hole and a second hole. The sliding member is slidable on the syringe barrel between a first position at which the first threaded hole is aligned with the syringe barrel for precise delivery of a material from the syringe and a second position at which the second hole is aligned with the syringe barrel for filling of the syringe or to stop bleed out.

Abstract: A threaded syringe provides a mechanism by which a clinician can deliver a viscous fluid through a relatively small lumen and can obtain tactile or audible feedback of delivery. The threaded syringe allows for delivery of more viscous fluids with less force and/or allows for more controlled delivery. The syringe includes a syringe barrel and a sliding member positioned on the proximal end of the syringe barrel. The sliding member has a first threaded hole and a second hole. The sliding member is slidable on the syringe barrel between a first position at which the first threaded hole is aligned with the syringe barrel for precise delivery of a material from the syringe and a second position at which the second hole is aligned with the syringe barrel for filling of the syringe or to stop bleed out.

Abstract: An interface needle is used for connecting a syringe to a catheter to create a blunt interface between two or more liquids being delivered through the catheter. The interface needle is particularly useful for creating a blunt interface between a biocompatible solvent and a liquid embolic composition which is delivered to the body for treatment of various conditions including aneurysms. A system for liquid delivery with a blunt liquid interface includes a catheter or other cannula, an interface needle, and a syringe. The interface needle includes a tube extending from a distal end which delivers liquid to a lumen of the catheter bypassing a reservoir in the catheter hub to create the blunt liquid interface. One embodiment of the interface needle controls an injection pressure of high viscosity liquids.