Medical Syringe

 
 
1. A syringe comprising: a hollow and elongated handle body having a first opening at a bottom thereof, having second opening at a top thereof, and having at least one manually operable and linear moveable valve operating button at the top thereof; an insert located within the top of the handle body in general alignment with the first opening in the handle body, the insert having an elongated cavity facing the first opening, and having at least one flow channel connecting the elongated cavity to a bottom portion of the insert; an elongated nozzle having one end mounted within the elongated cavity, and having an opposite end extending out of the second opening in the handle body; an elongated valve body mounted within the handle body, the valve body having at least one hose connection at a bottom end thereof, having at least one normally closed and linear movable valve located at a top end thereof, and having at least one, flow channel whose bottom end connects to the hose connection and whose top end connects to the at least one valve, the at least one valve being generally coincident with the bottom portion of the insert; and at least one arcuate-shaped valve actuator rod movably mounted within insert, the at least one actuator rod having a top end associated with the button and having a bottom end associated with the valve, such that manual depression of the at least one button causes linear movement of the button, arcuate movement of the at least one actuator rod, and linear movement of the at least one valve to an open position.

2. The syringe of claim 1 including alignment means associated with the valve body and the handle body for providing positional alignment between the at least one valve and the bottom end of actuator rod.

3. The syringe of claim 1 wherein the handle body extends in a first direction, wherein the nozzle extends in a direction that is generally perpendicular to the first direction, wherein the at least one normally closed valve is movable in the first direction to the open position, and wherein the at least one button is movable in a direction that is inclined to the first direction.

4. The syringe of claim 1 wherein the insert includes at least one semi-circular channel having a top end associated with the at least one button and having a bottom end associated with the at least one valve, and wherein the at least one actuator rod is a semi-circular rod that is movably located within the semi-circular channel.

5. The syringe of claim 4 wherein the semi-circular rod is movable in a semi-circle having a virtual center of rotation that is located in a space that need not include any portion of the syringe.

6. The syringe of claim 5 wherein the virtual center of rotation, the at least one semi-circular channel, and the at least one semi-circular rod are constructed and arranged to provide a predetermined button-force to valve-actuating-force ratio.

7. The syringe of claim 6 including alignment means associated with the valve body and the handle body for providing positional alignment between the at least one valve and the bottom end of actuator rod.

8. The syringe of claim 1 including: at least one tapered bore at the top of the at least one channel and extending in the first direction, the at least one tapered bore having a large diameter portion thereof located adjacent to the top of the at least one channel, and having a small diameter portion thereof that is spaced from the top of the at least one channel; at least one elongated valve stem located in the at least one tapered bore with a top end thereof associated with the bottom end of at least one arcuate-shaped valve actuator rod; a ring-shaped valve seat secured to and surrounding the at least one valve stem, the valve seat having an upper surface and a lower surface; a valve seat O-ring located between the valve seat and the small diameter portion of the at least one tapered bore; a valve O-ring fixed to a bottom end of the at least one valve stem for engagement with the lower portion of the valve seat; and a compression spring having an upper end fixed to the at least one valve stem and having a lower end engaging the upper portion of the valve seat, to thereby provide a normally closed condition of the at least one valve by force-biasing the valve O-ring into engagement with the lower portion of the valve seat.

9. The syringe of claim 8 wherein the insert includes a semi-circular channel having a top end associated with the at least one button and having a bottom end associated with the at least one valve, and wherein the at least one actuator rod is a semi-circular rod that is movably located within the semi-circular channel.

10. The syringe of claim 9 wherein the semi-circular rod is movable in a semi-circle having a virtual center of rotation that is located in a space that need not include portions of the syringe.

11. The syringe of claim 10 wherein the virtual center of rotation, the at least one semi-circular channel, and the at least one semi-circular rod are constructed and arranged to provide a predetermined button-force to valve-actuating-force ratio.

12. The syringe of claim 1 wherein the insert is formed of a relatively heavy-weight metal such as brass, and wherein the handle body is formed of a relatively light-weight metal such as aluminum, to thereby provide a syringe that is optimally weight-balanced for use in the human hand.

13. The syringe of claim 12 wherein the handle body is formed of aluminum, and wherein the aluminum handle body is anodized to provide a desired color.

14. The syringe of claim 13 including alignment means associated with the valve body and the handle body for providing positional alignment between the at least one valve and the bottom end of actuator rod.

15. The syringe of claim 1 including: a removable insert assembly pin extending through a hole in the handle body and a hole in the insert, the insert assembly pin for removably securing the insert within the handle body.

16. The syringe of claim 15 wherein the nozzle is removably secured in the elongated channel by a torsion spring secured to the insert, wherein the nozzle is positioned within the torsion spring such that when no rotational unwinding force is applied to the tension spring its compresses around the nozzle thereby securing the nozzle to the insert.

17. The syringe of claim 16 including: means associated with the nozzle and the handle body for resisting rotation of the nozzle about an axis of the elongated channel.

18. The syringe of claim 1 wherein the nozzle is removably secured in the elongated channel by a torsion spring secured to the insert, wherein the nozzle is positioned within the torsion spring such that when no rotational unwinding force is applied to the tension spring its compresses around the nozzle thereby securing the nozzle to the insert.

19. The syringe of claim 18 including alignment means associated with the valve body and the handle body for providing positional alignment between the at least one valve and the bottom end of actuator rod.

 

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