Irrigation syringe

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues, and a manually operable valve in fluid communication with said liquid inlet and said discharge opening of said handpiece for controlling the flow of liquid from said discharge opening, said manually operable valve comprising a flexible tube which constitutes at least a portion of the flow path between said liquid inlet of said handpiece and said discharge opening of said handpiece, and a plurality of bearings which cooperate to engage said flexible tube to reduce the cross-sectional flow area thereof and restrict flow therethrough, at least one of said bearings being movable away from said flexible tube to allow the same to flex and assume a large cross-sectional flow area.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues,
• said pressure regulator unit further including a reservoir chamber in fluid communication with said supply chamber, and a flow restrictive fluid connection providing said fluid communication between said supply and said reservoir chambers.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues,
• said pressure regulator unit further including a temperature indicator mounted thereon for indicating the temperature of liquid in said pressure regulator unit.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues,
• said pressure regulator unit further including a pressure indicator mounted thereon for indicating the pressure of liquid in said pressure regulator unit.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• said pressure relief outlet including a plurality of check valves, each check valve having an inlet side and an outlet side, said outlet side of each of said check valves being in communication with the ambient atmosphere, each check valve having a predetermined opening pressure, and a flow selector valve for providing a fluid passageway between said liquid in said pressure regulator unit and said inlet side of a selected one of said check valves, whereby an operator can choose a desired liquid pressure for said syringe.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues:
• said flow limiting orifice having a diameter less than or equal to about 0.15 inches.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet, said liquid inlet having a flow limiting orifice, said pressure relief outlet being in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet having a check valve which opens to allow liquid to flow from said pressure relief outlet when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• a reservoir chamber in fluid communication with said supply chamber;
• said supply chamber and said reservoir chamber being defined by inner and outer concentric tubes having a space therebetween, said inner concentric tube having an internal volume defining said supply chamber, said space between said inner and outer concentric tubes comprising an annular volume defining a reservoir chamber having said liquid outlet.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet having a flow limiting orifice opening to said supply chamber, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermined value;
• said check valve having a first flow area, said flow limiting orifice having a second flow area which is less than said first flow area of said check valve such that said pressure regulator unit provides a generally steady flow of pressure regulated liquid from said liquid outlet;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• and
• at least one temperature indicator on said syringe to indicate the temperature of liquid within said syringe.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• and
• at least one temperature indicator on said syringe to indicate the temperature of liquid within said syringe;
• said pressure regulator unit further including a reservoir chamber in fluid communication with said supply chamber, and a flow restrictive fluid connection providing said fluid communication between said supply and said reservoir chambers;
• said liquid outlet connected to said reservoir chamber.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• and
• at least one temperature indicator on said syringe to indicate the temperature of liquid within said syringe, said temperature indicator being on said pressure regulator unit.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• at least one temperature indicator on said syringe to indicate the temperature of liquid within said syringe;
• and
• a pressure indicator on at least one of said pressure regulator unit and said handpiece for indicating the pressure of liquid in said syringe.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermine value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• and
• at least one pressure indicator on said syringe to indicate the pressure of water in said syringe.

An irrigation syringe, comprising:

• a handpiece;
• a pressure regulator unit including a supply chamber having a liquid inlet, a liquid outlet in fluid communication with said supply chamber and adapted to supply liquid to said handpiece, and a pressure relief outlet in fluid communication with said supply chamber and adapted to release liquid from said pressure regulator unit, said pressure relief outlet including a check valve which opens to allow liquid to flow therefrom when pressure in said supply chamber exceeds a predetermined value;
• said handpiece having a liquid inlet in fluid communication with said liquid outlet of said pressure regulator unit, and a discharge opening from which pressure regulated liquid from said liquid inlet of said handpiece issues;
• and
• at least one temperature indicator on said syringe to indicate the temperature of liquid within said syringe;
• said pressure regulator unit further including a reservoir chamber in fluid communication with said supply chamber, said supply chamber and said reservoir chamber being defined by a pair of inner and outer concentric tubes having a space therebetween, said inner concentric tube having an internal volume defining said supply chamber, said space between said inner and outer concentric tubes comprising an annular volume defining a reservoir chamber having said liquid outlet.