Pre-filled syringe
First Claim
Patent Images
1. An apparatus for a one time injection of a liquid injectant comprising:
- a hollow cylindrical casing having a first open end and a second opposite end;
a barrel for holding said injectant, said barrel disposed at a first end to slide through said first open end of said casing from a remote pre-injection position to a forward injection position and back again;
means coupled to said barrel for ejecting said injectant;
a hollow needle disposed within said casing and having an opening at each end thereof;
means for extending said needle through said casing second end and placing said needle in fluid communication with said injectant when said barrel moves from said remote pre-injection position to said forward injection position and for retracting said needle through said casing second end into said casing when said barrel moves back again to said pre-injection position; and
means for blocking automatically said needle from extending through said casing second end after said needle has been retracted.
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Abstract
A pre-filled syringe is provided with a retractile needle. The needle end of a syringe is enclosed in a sterile chamber within a casing sealed by a cap with a break-off tip. The barrel of the syringe is movable within the casing from a remote pre-injection position to a forward injection position and back again. When the barrel is moved forward a first end of the needle passes through the opening of the cap and then the opposite end comes in contact with the injectant. When the barrel is withdrawn to a pre-injection position, the needle is retracted within the casing and is prevented from re-entering the opening in the cap.
84 Citations
30 Claims
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1. An apparatus for a one time injection of a liquid injectant comprising:
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a hollow cylindrical casing having a first open end and a second opposite end; a barrel for holding said injectant, said barrel disposed at a first end to slide through said first open end of said casing from a remote pre-injection position to a forward injection position and back again; means coupled to said barrel for ejecting said injectant; a hollow needle disposed within said casing and having an opening at each end thereof; means for extending said needle through said casing second end and placing said needle in fluid communication with said injectant when said barrel moves from said remote pre-injection position to said forward injection position and for retracting said needle through said casing second end into said casing when said barrel moves back again to said pre-injection position; and means for blocking automatically said needle from extending through said casing second end after said needle has been retracted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification