Preloaded automatic disposable syringe
First Claim
1. A disposable, subcutaneous injection syringe which comprises:
- a. a cylindrical housing having an outer diameter greater than its length and having a central, cylindrical well, a first aperture in its bottom wall and a second aperture in its top wall;
b. a cylinder having an outer diameter to be received in said cylindrical well of said housing and received therein for sliding movement between said apertures, a through bore in the bottom wall of said cylinder and a hypodermic needle permanently mounted therein, and a piston slidably received in said cylinder;
c. a dispenser carriage mounted in said housing and moveable therein through an axial distance less than said outer diameter of said cylinder, between retracted and extended positions;
d. a trigger button carried on said carriage and projecting through said second aperture;
e. means coupling said piston to said carriage;
f. cylinder retraction means within said housing to maintain said needle withdrawn in said housing;
g. a single actuator spring received within said housing and bearing against said cylinder to extend said needle through said first aperture in the bottom wall of said housing;
h. a single detent, which engages said carriage in its retracted position and restrains its movement in said housing; and
i. a sterile seal cover extending across said first aperture.
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Accused Products
Abstract
There is disclosed a precharged disposable syringe consisting of a housing having a central aperture through which extends an actuator button to contact an internal piston mounted over a medication ampoule contained in the housing. The ampoule includes a dependent hypodermic needle and the ampoule is slightively mounted in the housing for movement between a recessed position where it is totally contained and supported within the housing and an extended position with the dependent needle projecting out of the housing. An actuator spring is located in the housing and is compressed and biased to move the piston and the ampoule into the projected position. Medication is discharged by the mechanically coupled actuator button and piston. The actuator button and piston is locked for safety with a dent and plastic ring.
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Citations
22 Claims
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1. A disposable, subcutaneous injection syringe which comprises:
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a. a cylindrical housing having an outer diameter greater than its length and having a central, cylindrical well, a first aperture in its bottom wall and a second aperture in its top wall; b. a cylinder having an outer diameter to be received in said cylindrical well of said housing and received therein for sliding movement between said apertures, a through bore in the bottom wall of said cylinder and a hypodermic needle permanently mounted therein, and a piston slidably received in said cylinder; c. a dispenser carriage mounted in said housing and moveable therein through an axial distance less than said outer diameter of said cylinder, between retracted and extended positions; d. a trigger button carried on said carriage and projecting through said second aperture; e. means coupling said piston to said carriage; f. cylinder retraction means within said housing to maintain said needle withdrawn in said housing; g. a single actuator spring received within said housing and bearing against said cylinder to extend said needle through said first aperture in the bottom wall of said housing; h. a single detent, which engages said carriage in its retracted position and restrains its movement in said housing; and i. a sterile seal cover extending across said first aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A disposable, subcutaneous injection syringe which comprises:
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a. a housing having a first aperture in its bottom wall and a second aperture in its top wall; b. a cylinder received in said housing mounted in said housing for sliding movement between said apertures, a through bore in the bottom wall of said cylinder and a hypodermic needle permanently mounted therein, and a piston slidably received in said cylinder; c. a dispenser carriage mounted in said housing and moveable therein between retracted and extended positions; d. a trigger button carried on said carriage and projecting through said second aperture; e. means coupling said piston to said carriage; f. cylinder retraction means within said housing to maintain said needle withdrawn in said housing; g. an actuator spring received within said housing and bearing against said cylinder to extend said needle through said first aperture in the bottom wall of said housing; h. a detent engaging said carriage in its retracted position and restraining its movement in said housing; i. a sterile seal cover extending across said first aperture; and j. an annular chamber within said housing, and an internal passageway communicating between said annular chamber and said cylinder, above said piston. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification