Pressure hypodermic syringe
First Claim
1. A pressure hypodermic syringe for jet injection of variable doses of liquid medication in the intradermal, subcutaneous or intramuscular tissues of persons or animals, characterized by having a nozzle containing a minute front orifice through which the medication dose is expelled in jet form, an injection piston displaceable forward and backward respectively for aspiration and injection of the medication dose, a transparent graded cylinder to hold the desired dose each time and which can withstand the internal pressure generated as the piston presses the liquid toward the front orifice, sealing rings at both ends of said cylinder to prevent leakage of said liquid, said nozzle and front orifice forming a forward unit, said piston and spring comprising elements of a back unit, and one each of said sealing rings respectively tightly secured between the ends of said cylinder and said forward and back units, a spring which is depressed at a given pressure before each aspiration, and decompressed in a single movement, causing the piston to be promptly impelled forward to inject the medication dose through the front orifice, a screw which, when turned forward, causes the spring to compress, and when turned backward becomes coupled to the back end of the piston, pulling it backward and causing aspiration of the medication dose into the transparent graded cylinder, and a shot button that when activated uncouples the back end of the piston from the screw, causing sudden decompression of the spring which in turn forces the piston to impel the medication dose toward the front orifice, such that the syringe comprising all the above components can simultaneously inject variable doses of the medication dispensed in jet form, while allowing for visual dose adjustment at each aspiration through the changing of the position of the forward face of the piston as it is displaced inside the transparent graded cylinder, thereby allowing the user to visualize at once and each time the entire graded scale, the entire medication dose inside the cylinder, and the front end of the piston.
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Accused Products
Abstract
A pressure hypodermic syringe designed to inject liquid medication includes the feature of simultaneously utilizing a pressure injection system and of comprising basically the two elements that characterize each and every syringe using conventional hypodermic needles, that is, a transparent graded cylinder where the desired medication dose is inserted, and a piston for intake and injection of the dose by displacing itself inside the transparent graded cylinder. The present invention is characterized by being the only hypodermic injection device to dispense with the use of needles while at the same time retaining the simplicity and safely qualities of conventional syringes, since the user may visually set the desired dose for injection and check for the presence of air bubbles before each injection.
119 Citations
9 Claims
- 1. A pressure hypodermic syringe for jet injection of variable doses of liquid medication in the intradermal, subcutaneous or intramuscular tissues of persons or animals, characterized by having a nozzle containing a minute front orifice through which the medication dose is expelled in jet form, an injection piston displaceable forward and backward respectively for aspiration and injection of the medication dose, a transparent graded cylinder to hold the desired dose each time and which can withstand the internal pressure generated as the piston presses the liquid toward the front orifice, sealing rings at both ends of said cylinder to prevent leakage of said liquid, said nozzle and front orifice forming a forward unit, said piston and spring comprising elements of a back unit, and one each of said sealing rings respectively tightly secured between the ends of said cylinder and said forward and back units, a spring which is depressed at a given pressure before each aspiration, and decompressed in a single movement, causing the piston to be promptly impelled forward to inject the medication dose through the front orifice, a screw which, when turned forward, causes the spring to compress, and when turned backward becomes coupled to the back end of the piston, pulling it backward and causing aspiration of the medication dose into the transparent graded cylinder, and a shot button that when activated uncouples the back end of the piston from the screw, causing sudden decompression of the spring which in turn forces the piston to impel the medication dose toward the front orifice, such that the syringe comprising all the above components can simultaneously inject variable doses of the medication dispensed in jet form, while allowing for visual dose adjustment at each aspiration through the changing of the position of the forward face of the piston as it is displaced inside the transparent graded cylinder, thereby allowing the user to visualize at once and each time the entire graded scale, the entire medication dose inside the cylinder, and the front end of the piston.
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8. A pressure hypodermic syringe for jet injection of variable doses of liquid medication in the intradermal, subcutaneous or intramuscular tissues of persons or animals, comprising:
- a forward unit including a nozzle containing a minute front orifice through which the medication dose is expelled in jet form, said forward unit provided with a holder for a medication vial and an intake needle with one end insertable in said vial and the other end coupled to a valve also located in the forward unit, a transparent injection cylinder rearwardly of said nozzle, an injection piston displaceable backward and forward out of and into said transparent injection cylinder respectively for aspiration and injection of the medication dose, a spring compressed at a given pressure before each aspiration, said valve opening automatically by suction created as said injection piston starts its backward motion causing aspiration of the liquid, means operable to suddenly decompress said compressed spring to promptly impel said piston forward to inject the medication dose within said transparent injection cylinder through said front orifice, and said valve closing automatically as a result of the compression of the liquid when the latter is pushed forward by the injection motion of said piston.
- View Dependent Claims (9)
Specification