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US 5,176,640 AGranted
Hypodermic injection syringe provided with a plunger able to retract and contain the hypodermic needle after use
OwnerGaetano Nacci, Carla Nacci Tagliaferriinventors
Life of this patent
Estimating the term…
Abstract
A syringe is provided with an engagement device which at the end of the plunger travel becomes connected to the hypodermic needle and to a pneumatic actuator, preferably of vacuum type, arranged to cause the needle to enter an appropriate chamber in the plunger after use.
Claims17
A hypodermic injection syringe comprising:
- a generally cylindrical body;
- a plunger slidable within said body, the plunger being provided with a hollow shaft defining an inner chamber;
- one of a hollow needle and cannula;
- first shearable means for connecting the one of a hollow needle and metal cannula to the body;
- an engagement device connected to the plunger;
- second means for connecting the engagement device to the plunger, the second means shearing under a determined load in response to an end of travel of said plunger, the engagement device becoming operationally connected to the one of a hollow needle and cannula at the end of travel of said plunger;
- and
- a pneumatic actuator for drawing the one of a hollow needle and cannula into said chamber in the shaft of the plunger in response to shearing of the second means when the plunger reaches the end of travel.
5 more elements
Dependencies are inferred from the claim text.