Preloaded automatic disposable syringe
First Claim
1. An automatic syringe comprising:
- a. a one-piece body with a cylindrical inside wall and having an injection end and an actuator end;
b. an injection end wall permanently secured to said injection end of said body and having a cylindrical well on its inside surface which extends coaxially within said body forming an open interior annulus within said body;
c. a medication-containing ampoule bearing an injection needle and slidably received within said well;
d. a piston slidably received within said ampoule;
e. a actuator end wall having a through aperture and permanently secured to the actuator end of said body;
f. an actuator carriage having an inner end received against said piston and having its opposite end extending through said aperture and exteriorly of said body, and having an annular flange with a downwardly dependent integral cylindrical skirt with an annular lip extending radially outwardly and bearing against the inside wall of said body and slidably received within said annulus; and
a compression spring captured between said annular flange and said actuator end wall.
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Accused Products
Abstract
The invention is a pre-charged, disposable syringe capable of use by patients. The syringe has a housing with a cover having a central aperture which receives an actuator button. The actuator button extends to an internal piston which is mounted over a medication ampoule. The ampoule has a dependent hypodermic needle which is slidably received in the housing and moves between recessed and projected positions. In its recessed position, the ampoule is totally contained within the housing, and in its projected position, the hypodermic needle projects from the housing. The housing contains an actuator spring, which is compressed and biased to move the piston and the ampoule into its projected position. The medication is discharged from the ampoule by the mechanically coupled piston, or by the release of air from an internal air pressure chamber. The actuator button is locked for safety with a detent and plastic ring or a trigger safety stylet and is covered with a protective, removable cap to prevent accidental or unintended injection of the medication.
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Citations
20 Claims
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1. An automatic syringe comprising:
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a. a one-piece body with a cylindrical inside wall and having an injection end and an actuator end; b. an injection end wall permanently secured to said injection end of said body and having a cylindrical well on its inside surface which extends coaxially within said body forming an open interior annulus within said body; c. a medication-containing ampoule bearing an injection needle and slidably received within said well; d. a piston slidably received within said ampoule; e. a actuator end wall having a through aperture and permanently secured to the actuator end of said body; f. an actuator carriage having an inner end received against said piston and having its opposite end extending through said aperture and exteriorly of said body, and having an annular flange with a downwardly dependent integral cylindrical skirt with an annular lip extending radially outwardly and bearing against the inside wall of said body and slidably received within said annulus; and a compression spring captured between said annular flange and said actuator end wall. - View Dependent Claims (2, 3, 4, 8, 10, 11)
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5. In an automatic syringe in which an ampoule having a medication-containing chamber with
a. a hypodermic needle in open communication therewith is slidably received within an outer housing having an actuator end wall and an opposite, medication injection end wall, a needle passage in said medication injection end wall, a membrane seal on said injection end wall covering said needle passage, with said chamber being moveable between a fully retracted position and an extended position wherein said needle projects through said needle passage of said housing a sufficient distance for subcutaneous injections, and is biased by an actuator spring into its extended position, which spring is retained in a compressed state by a detent having a detent release member supported at said actuator end wall externally of said housing, and wherein said ampoule contains a slidably received piston to effect discharge of its contents, the improvement comprising: -
b. an inner cylindrical wall, integral with, and in the interior of, said housing extending from said medication injection end wall and slidably receiving said ampoule and being of a lesser diameter than said housing to form a first annulus with the outer wall of said housing; c. an aperture in said actuator end wall; d. a one-piece actuator carriage having a central boss with its upper end extending through said aperture in said actuator end wall, exteriorly of said housing with said boss bearing an integral detent element cooperative with said detent releasing member, and at least one integral projection on its lower end which bears directly against said piston and an integral circular flange axially located between said boss and said projection with a downwardly dependent, integral cylindrical skirt having a diameter permitting its slidable reception within said first annulus and forming a second annulus with the wall of said housing, said skirt also having at its lower end an integral annular lip extending radially outwardly into contact with the inner wall of said housing; and e. said actuator spring being received within said second annulus and biased between said actuator end wall of said housing and said lip. - View Dependent Claims (6, 7, 9, 12)
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13. An automatic syringe which comprises:
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a. a syringe body having an outer wall and a medication injection end wall, a needle passage in said medication injection end wall, and a membrane seal on said injection end wall covering said needle passage; b. a medication-containing retractable ampoule with a needle, said ampoule slidably received within said syringe body; c. an ejection mechanism within said syringe body and having a detent located and operable externally of said body to release said mechanism and advance said ampoule and needle and project said needle exteriorly of said body; and d. a protective sheet material overlying said membrane seal and bonded thereto by a peelable, pressure sensitive adhesive. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An automatic syringe which comprises:
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a. a syringe body having an actuator end wall with an aperture; b. a medication-containing retractable ampoule with a needle, said ampoule slidably received within said syringe body; c. an ejection mechanism within said syringe body to advance said ampoule and needle and project said needle exteriorly of said body including a piston slidably received within said body and having an upper end extending through said aperture, a groove in said upper end; and d. a detent comprising a lever arm which is pivotally mounted on a longitudinally axially disposed axis on the outside of said actuator end wall and is moveable between a detenting position seated in said groove and a releasing position removed from said groove.
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Specification