Self-locking safety syringe

Claim 2

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed; and means for preventing misalignment of the needle guard in relationship to the casing, said means comprising at least one outwardly extending runner mounted on an outer surface of the needle guard and at least one elongated groove formed in an interior wall of the casing, the groove being sized and shaped to receive the runner in slidable engagement therein.

Claim 3

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed; means for limiting outward movement of the needle guard in relationship to the casing; and wherein said limiting means comprises an outwardly extending annular shoulder formed on the needle guard and an inwardly extending shoulder formed in the casing, said shoulders abutting each other, when the needle guard is moved to its most outwardly extending position in relation to the casing.

Claim 4

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed; means for limiting outward movement of the needle guard in relationship to the casing; and wherein said limiting means comprises an outwardly extending annular shoulder formed on the needle guard and an inwardly extending shoulder formed in the casing, said shoulders abutting each other, when the needle guard is moved to its most outwardly extending position in relation to the casing.

Claim 5

The device of claim 2, wherein said shoulder of the needle guard and the shoulder of the casing extend at a matching inclined angle in relation to a longitudinal axis of the device.

Claim 6

The device of claim 3, wherein said needle guard has a first, nose portion, a second, middle portion, and a third, inner portion, and wherein said shoulder is formed at a line of attachment of the middle portion to the inner portion.

Claim 7

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed; wherein said casing has a first open end, through which the needle guard extends, and a second, partially closed end, and wherein an enlarged diameter flange is mounted on the second end, said flange being provided with a central opening which is sized and shaped to receive the syringe barrel therethrough, the syringe barrel having a syringe piston on its innermost end, and an end plate on its outermost end, said end plate engaging the flange in a fixed engagement; and wherein said flange is provided with a first recessed groove, which is sized and shaped to receive the end plate in a locking engagement therein.

Claim 8

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed; wherein said casing has a first open end, through which the needle guard extends, and a second, partially closed end, and wherein an enlarged diameter flange is mounted on the second end, said flange being provided with a central opening which is sized and shaped to receive the syringe barrel therethrough, the syringe barrel having a syringe piston on its innermost end, and an end plate on its outermost end, said end plate engaging the flange in a fixed engagement; and wherein said flange is provided with a first recessed groove, which is sized and shaped to receive the end plate in a locking engagement therein.

Claim 9

The device of claim 5, further comprising a sealing plate adapted to cover the end plate locked within the flange.

Claim 10

The device of claim 6, wherein said flange is provided with a second groove which is sized and shaped to receive the sealing plate in a locking engagement therein.

Claim 11

The device of claim 7, wherein said sealing plate is provided with a plurality of transversely extending pins, and said flange is provided with a plurality of matching openings to receive the pins in a fixed engagement therewith, thereby securely attaching the sealing plate to the flange.

Claim 12

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed, said tension spring means comprising a coil spring mounted in circumferential relationship about the syringe barrel; and wherein an outwardly extending shoulder is formed on the needle guard, said shoulder being provided with an inner groove, and wherein one end of the coil spring is received in said annular groove.

Claim 13

A self-locking safety syringe device, comprising: an elongated tubular casing; a syringe barrel having a needle assembly affixed thereto, said syringe barrel being securely attached to one end of the casing; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, exposing the needle assembly; a resilient depressible means for locking the needle guard in the first position, said locking means being carried by the needle guard; a tension spring means continuously urging the needle guard to the first position, thereby preventing accidental movement of the needle guard into the second position even after the locking means have been depressed, said tension spring means comprising a coil spring mounted in circumferential relationship about the syringe barrel; and wherein an outwardly extending shoulder is formed on the needle guard, said shoulder being provided with an inner groove, and wherein one end of the coil spring is received in said annular groove.

Claim 14

The device of claim 9, wherein one end of the casing is partially closed with a transverse flange, said flange having an inner surface and an outer surface.

Claim 15

The device of claim 10, wherein a second end of the coil spring urges against the inner surface of the transverse flange.

Claim 16

A safety guard device for a syringe needle, comprising: an elongated tubular casing having a first open end and a second, partially closed end, and wherein a transverse flange is fixedly attached to the second end of the casing, said transverse flange having a central opening extending therethrough, said opening being adapted for receiving a syringe barrel in co-axial engagement, said syringe barrel having a needle assembly attached to one of its ends and an end plate secured to its other end, said end plate fixedly engaging the transverse flange; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, away from the needle assembly, said needle guard having a first, nose portion, a second, middle portion, and a third, inner portion, and wherein an outwardly extending shoulder is formed at a line of attachment of the middle portion to the inner portion, said shoulder being provided with an annular groove; a resilient depressible locking means for locking the needle guard in the first position, said locking means being carried by the needle guard, said locking means comprising a pair of depressible locking tabs fixedly attached to the needle guard and extending outwardly through corresponding aligned openings formed in the casing; a tension spring means continuously urging the needle guard into the first position, thereby preventing accidental movement of the needle guard into the second position, even after the locking means have been depressed; means for preventing misalignment of the needle guard in relationship to the casing, said means comprising at least one outwardly extending runner mounted on an outer surface of the needle guard and at least one elongated groove formed in an interior wall of the casing, the groove being sized and shaped to receive the runner in slidable engagement therein.

Claim 17

A safety guard device for a syringe needle, comprising: an elongated tubular casing having a first open end and a second, partially closed end, and wherein a transverse flange is fixedly attached to the second end of the casing, said transverse flange having a central opening extending therethrough, said opening being adapted for receiving a syringe barrel in co-axial engagement, said syringe barrel having a needle assembly attached to one of its ends and an end plate secured to its other end, said end plate fixedly engaging the transverse flange; an elongated hollow needle guard telescopically co-axially engaged with the casing, said needle guard being movable between a first position, substantially covering the needle assembly and a second, retracted position, away from the needle assembly, said needle guard having a first, nose portion, a second, middle portion, and a third, inner portion, and wherein an outwardly extending shoulder is formed at a line of attachment of the middle portion to the inner portion, said shoulder being provided with an annular groove; a resilient depressible locking means for locking the needle guard in the first position, said locking means being carried by the needle guard, said locking means comprising a pair of depressible locking tabs fixedly attached to the needle guard and extending outwardly through corresponding aligned openings formed in the casing; a tension spring means continuously urging the needle guard into the first position, thereby preventing accidental movement of the needle guard into the second position, even after the locking means have been depressed; means for preventing misalignment of the needle guard in relationship to the casing, said means comprising at least one outwardly extending runner mounted on an outer surface of the needle guard and at least one elongated groove formed in an interior wall of the casing, the groove being sized and shaped to receive the runner in slidable engagement therein.

Claim 18

The device of claim 12, wherein an inwardly extending shoulder is formed in the casing, said shoulder abutting the outwardly extending shoulder of the needle guard to limit outward movement of the needle guard in relationship to the casing.

Claim 19

The device of claim 13, wherein said shoulder of the needle guard and the shoulder of the casing extend at an inclined angle in relation to a longitudinal axis of the device.

Claim 20

The device of claim 12, wherein said tension spring means comprises a coil spring mounted in circumferential relationship about the syringe barrel.

Claim 21

The device of claim 8, wherein one end of the coil spring is received in an annular groove formed in the outwardly extending shoulder of the needle guard, while the second end of the coil spring urges against an inner surface of the transverse flange attached to the casing.

Claim 22

The device of claim 12, wherein said flange is provided with a first recessed groove adapted to receive the end plate in a fixed engagement thereto.

Claim 23

The device of claim 17, further comprising a sealing plate for covering the end plate locked within the first groove.

Claim 24

The device of claim 18, wherein said flange is provided with a second recessed groove sized and shaped to receive the sealing plate in a locking engagement therein.

Claim 25

The device of claim 18, wherein said end plate is provided with a plurality of transverse pins, and said flange is provided with a plurality of matching openings, said pins being adapted for a fixed engagement within said openings.