Hypodermic non-reusable syringes without voluntary intervention of the user
First Claim
1. An autodiscardable hypodermic syringe with preset piston stroke limitation, comprising:
- an elongated cylinder having an opened end and an opposite substantially closed end;
an external tubular mouthpiece having a conduit for the coupling of a needle to said substantially closed end;
a piston being slidably received in said cylinder;
a rod for sliding said piston being selectively connected to said piston, an end of said rod remote from said piston projecting beyond said open end of said cylinder, said piston being selectively connected to said rod through a coupling and uncoupling mechanism, said coupling and uncoupling mechanism comprises a narrow body that projects from the internal end of the rod and has a passage coincident with a central axis of said rod, said passage extends from side to side of said narrow body and defines a descending section, that in its middle part has a deviation disposed outward of the descending section and of said narrow body;
said piston being provided with a cavity for housing said narrow body and a hook in said passage being displacable from said descending section and through the deviation outward from the passage during the expulsion movement; and
retention means for retaining said rod in said cylinder being provided within the cylinder of the syringe in an area that permits the normal operation of the piston and rod.
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Accused Products
Abstract
An autodiscardable hypodermic syringe having a preset piston stroke limitation includes an elongated cylinder having an opened end an opposite substantially closed end. A conduit of an external tubular mouth piece for coupling with the needle is connected to the substantially closed end of the cylinder. A piston is slidably received within the cylinder. A rod for sliding the piston is selectively connected to the piston. An end of the rod remote from the piston projects beyond the open end of the cylinder. The piston is selectively connected to the rod through a coupling and uncoupling mechanism. The coupling and uncoupling mechanism includes a narrow body that projects from the internal end of the rod and has a passage coincident with a central axis of the rod. The passage extends from side to side of the narrow body and defines a descending section that in its middle part has a deviation disposed outward of the descending section and of the narrow body. The piston is provided with a cavity to house the narrow body. The piston is also provided with a hook disposed within the passage that is capable of being displaced from the descending section and outward through the deviation during expulsion movements respectfully. Additionally, the syringe includes a retention device for retaining the rod in the cylinder that is provided within the cylinder of the syringe in an area that does not impede with the normal operation of the piston and rod.
56 Citations
10 Claims
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1. An autodiscardable hypodermic syringe with preset piston stroke limitation, comprising:
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an elongated cylinder having an opened end and an opposite substantially closed end; an external tubular mouthpiece having a conduit for the coupling of a needle to said substantially closed end; a piston being slidably received in said cylinder; a rod for sliding said piston being selectively connected to said piston, an end of said rod remote from said piston projecting beyond said open end of said cylinder, said piston being selectively connected to said rod through a coupling and uncoupling mechanism, said coupling and uncoupling mechanism comprises a narrow body that projects from the internal end of the rod and has a passage coincident with a central axis of said rod, said passage extends from side to side of said narrow body and defines a descending section, that in its middle part has a deviation disposed outward of the descending section and of said narrow body; said piston being provided with a cavity for housing said narrow body and a hook in said passage being displacable from said descending section and through the deviation outward from the passage during the expulsion movement; and retention means for retaining said rod in said cylinder being provided within the cylinder of the syringe in an area that permits the normal operation of the piston and rod. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification