MXPA98009133A - Seguri syringe - Google Patents

Abstract

A safety syringe that has a barrel (1), a piston with a piston body (2) and a piston head (3), and a protective cover (4) that carries formations that couple the piston. A fluid path extends through the head (3) and the body (2), and the body (2) is located to extend within the cover (4) and to be coupled by the formations that couple the piston, with the head (3) outside the cover (4) and connected and in fluid communication with the body (2). The barrel (1) is slidable on the head (3) and the cover (4) in a discharge position to release the formations that couple the piston and tighten the discharge piston to remove the piston essentially released from the cover to a position closed safely in relation to the cover

Description

SAFETY SYRINGE FIELD OF THE INVENTION This invention relates to a safety syringe.

BACKGROUND OF THE INVENTION With the "increased risk" of infections-for • needle injuries, there is a demand for a syringe that can be used and disposed of in a manner that reduces the risk of this injury. "" OBJECTIVE OF THE INVENTION One objective of this invention is to provide "a safety syringe.

SUMMARY OF THE INVENTION In accordance with this invention, a syringe is provided which consists of: a generally tubular protective cover carrying formations that engage a plunger or piston and having a needle end and an opposite posterior end; An émbo-which includes an elongated body of the plunger and a "plunger head, there being a fluid access passage through the head and longitudinally-through the body, the piston body being operatively locatable to extend within - of the cover and being coupled by the formations that engage with the plunger, with the head of the plunger "outside" the cover and connected to-and in fluid communication with the plunger body; A cylinder or barrel which is slidable in a discharge stroke during use on the head of the operatively located piston and the cover to a discharge position, whereby the coupling formations of the piston are released, and tightens the released piston, the cylinder being slidable in the opposite direction from the unloading position to remove the plunger substantially released from the cover to a locked, secure position relative to the cover. Preferably, in a first embodiment of the invention, the plunger body has a front end and a rear end, with fasteners or front and rear fasteners on the plunger, and the cover has stops at its rear end, the plunger fasteners and the stops are arranged to allow the plunger body to be inserted into the cover with the rear fasteners "in engagement with the cover bumpers and immobilizing the plunger body against the recoil-of and insertion to the cover, in this orientation rotational with the cover, and being further arranged to allow the_ movement of the cylinder to its discharged position to release the rear fasteners of the plunger, and to allow the front fasteners of the plunger to engage the stops with the movement of the plunger body. " to the immobilized, secure position, provided on the cover with a first and second half-key or keyway "axial, having the rimer - half-key "one way" in cut designed to guide a fastener ^ that rotates in this during "use toward the second half-keyhole, and the second half-key having rugged edges designed to" "prevent rotational movement of a fastener in this one - during use. In addition, each of the first and second keyhole means are a pair of keyholes "that" -single in the diametrically opposite direction, with the pairs located at 90 ° to each other in transverse orientation of the cover. Each keyhole of a pair has an antagonizing stop or transverse fastener, the fastening stop of the first keyhole pair being - located beyond "the interior of the cover that the fastener-stop" of the "second pair" of keyholes. Preferably, the front plunger fasteners of the plunger body form sliding guides of the keyhole, and have opposing gripper formations, with a front formation which can slide over the stops only in a forward direction, and a formation The rear fasteners of the plunger body may have opposing fastening formations, a front fastening assembly being slidable over the stops with the insert in the cover, and a subsequent formation which makes contact with the fasteners. stop with the stops when the piston body slides towards the cover., the subsequent formation of the posterior fasteners of the plunger have the form to cooperate with the head of the plunger, with the movement of the head of the plunger with the cylinder at the end of a stroke "discharge during use, to decouple the formation of the plunger back fastener from its stop.otherwise, the coupling formations of the plunger in the cover may include fins or tabs arranged to engage the slots in the plunger.Preferably, these fins are part of the wall of the plunger. cover and project axially towards the rear from a hinge end at the needle end of the cover, the free ends being engageable by the end of the cylinder at the end of a discharge stroke to form the hinge of the fins towards outside and outside the coupling with the slots.

In addition, the slots are carried in diametrically opposed plunger hooks extending in the direction of the axis from the plunger body at a front end thereof, and are deformable inwardly in a resilient manner. The cover can have the same configuration of the keyhole. For this purpose, the cover can have a first and second axial keyhole means, the first keyhole means having a transverse shape designed to guide a fastener that rotates therein during use towards the second keyhole means, and the second half keyhole having edges cranks designed to prevent the rotary movement of a fastener therein during use, each keyhole means having a transverse stop at the rear end of the cover, and in which the hooks form keyway sliding guides, arranged to allow the insertion of the piston body towards the first keyhole means with the slots of the coupling engaged in the stop of the first keyhole means, and to allow the rotation of the piston body in this location to guide the hooks towards the second keyhole means, free of the stop of the second keyhole means in a direction of insertion of the plunger body towards the cover, and in addition to The separation of the piston body with the hooks in the second keyhole means is to a position where the slots of the coupling engage with the stop in the second keyhole means to immobilize the plunger body against insertion and separation. It is also envisaged that the plunger head be integrated with the plunger body. Another feature of the invention provides that the plunger be separated from the plunger body and be connectable with the plunger body to form the plunger.

BRIEF DESCRIPTION OF THE DRAWINGS The embodiments of the invention are described below only by way of example, and with reference to the accompanying drawings, in which: Figure 1 is a sectional longitudinal side view of a cylinder and piston head according to with the invention; Figure 2 is a sectional longitudinal side view of a plunger body and a cover according to the invention; Figure 3 is a sectional longitudinal side view like that of Figure 2, but rotated 90 ° about the axis of the cover and the body of the plunger; Figure 4 is an isometric view partially cut away of the head of the plunger connected to the plunger body inserted in the cover; Figure 5 is an isometric view of the trailing end of the plunger body; Figure 6 is an isometric view of the front end of the plunger body; Figure 7 is an isometric view of the rear entrance to the roof; Figure 8 is an isometric view of two longitudinal halves of the rear end of the cover cut out and opened for explanatory purposes; Figure 9 is a view of the front part of the plunger body inserted in the cover in a packed position; Figure 10 is a side, longitudinal, sectioned view of the plunger body and cover after a quarter relative rotation of the plunger body within the cover from the packed position; Figure 11 is an isometric view of the configuration of the embodiment of Figure 10; Figure 12- is a side view of the plunger body fully inserted into the sheath in a reinforced position; Figure 13 is a partially sectioned isometric view of the rear part of the piston body in the position of Figure 12; Fig. 14 is a view of the syringe assembled with "the cylinder and the plunger head connected to the cover and the plunger body in a loaded state;" Fig. 15 is a side view of the syringe shown in the figure; 14 after a discharge stroke Figure 16 is a longitudinal side view of the syringe with the cylinder in a fully immobilized, non-immobilized position; Figure 17 is a longitudinal side view of the cylinder of the jig with the cylinder removed to a secure position, Figure 18 is an isometric view partially sectioned from the front of the body of the plunger. of the cover with the syringe in the safety position, as shown in figure 17; Figure 18 is a longitudinal side view and a section of a cylinder of an alternative embodiment of the invention; Figure 20 is a longitudinal section of a plunger body and integrated plunger head of the alternative embodiment; Figure 21 is a sectional longitudinal view of a pod of the alternative embodiment; Figure 22 is a partially sectioned isometric view of the interaction between the front end of a plunger body, the cover and the plunger cylinder in the alternative embodiment; Figure 23 ~ is an isometric view of the configuration of Figure 22 showing the release action of the fins.

DETAILED DESCRIPTION OF THE DRAWINGS WITH REFERENCE TO THE DRAWINGS Referring to Figures 1 to 3, a drug delivery system is in the form of a syringe having a cylinder (1), a plunger with an elongated plunger body ( 2) and a plunger head (3), and a cover (4).

The cylinder is tubular with a closed rear end (5) and an open front end or needle (6), and preferably is made of glass. A retainer may alternatively be provided for closing the trailing end, allowing the use of a simple length of the glass tube for the cylinder. With reference to figures 1 and 4, the head of the piston (3) is made of elastomeric material and is reciprocable inside the cylinder. It has integrated front and rear sealing rings (7) and (8) around it at each axial end, and a blind axial conduit (9) extending towards a rear axial end (10) within a projection. conical "(11). The projection extends beyond the front sealing ring (7) where the end of the projection (12) forms an integrated plug for the blind end of the conduit. The front sealing ring carries an annular flange extending radially inwardly (13) opposite recesses (13a) are provided to allow an action of torsional suspension - when the piston is located in its operative position. The body of the plunger (21) (figures 2, 3 and 6) has a central hypodermic needle (14) running along its length, extending from a front end or the needle (15) to, into, a rear end opposite (16). At the rear end (16) is shown in greater detail in figures 4 and 5. This is tubular, open at the rear and surrounds the rear needle at (17) as it extends into the tubular space (18). On diametrically opposite sides of the rear, tubular end are posterior plunger fasteners, with hinges (20) and (21). The fasteners are within the tubular wall, and extend in the direction of the axis from the hinges to their rear ends, to be resiliently pivotable towards and away from the tubular space (18), each fastener has two projecting ramp hooks outwards, separated, with a hitch (23) at its free end and a ramp (24) at its hinge end. The slopes (25) of the ramp hooks bear opposite directions to each other, and the shoulders (26) opposite each other. Positioned at 90 ° for the fasteners (20) and (21) on the outer side of the rear end of the plunger body, are the diametrically opposed side stops (30). On the outer side of the trailing edge are the diametrically opposed lugs (27) arranged to cooperate with the recesses (13a) of the plunger head. The front end of the plunger body is shown in greater detail in Figure 6. The diametrically opposed pairs of harpoon-holding formations 32 extend outwardly from the plunger body. Each pair (32) has a fastener (33) extending from the acute body and "axially towards the rear end of the plunger body, and a fastener (34) similarly extends toward the front of the body in the same plane as it engages , in the form of the opposite tabs The ends of the fasteners of a pair are short of each other with a space (35) between them.

With reference to figures 2, 3, 7 and "8, the cover (4) is shown, this has a rear end (38) and a front end or the end (39). (Figures 7 and 8") is divided into four quarters by two pairs of axial keyholes in coupling. Each keyhole of a pair (40) is joined at its axial sides by the edges extending inwardly and towards each other in the form of a dovetail groove. These keyholes have transverse stops (41) that run from the edge (42) to the edge (42) at the height of the edges, just inside the back end. In addition to these stops, the keyholes run along the uninterrupted deck, and are known as the "long" keyholes. The other pair of keyholes (44), have no jagged edges. Each keyhole extends smoothly in the cross section, from and to the height of the axial edges (42) to a central depth equal to the depth of the long keyholes. The second keyholes each have a transverse stop (45) that extends arched through them at the height of the edges (42). The stops (45) are placed inwardly of the stops (41) from the rear end of the plunger body. The smooth transverse shape of the second keyhole pair provides a cam action in use, and these keyholes are referred to as "cam" keyholes.

The cover has two handles for the fingers (48) established diagonally opposite each other, which extend from the front end (39) of the cover outwards. During use, the syringe is provided in a packed state as illustrated in Figures 1 to 3. This position is obtained by preloading the cylinder (1) with a necessary fluid, and inserting the head of the plunger (3) therein to act as a check A wrap or other suitable seal may be provided for the purposes of maintaining sterility. The plunger body (2) is inserted into the cover at the inlet end thereof. This is done by aligning the plunger body to slide the tabs (32) down the cam keyholes causing the front tabs (33J to be held on the stop (45) and the rear tabs (34) to be locked behind it. The piston body in this rotational orientation is immobilized in the position, the needle is completely contained within the cover and is protected .. To use the syringe, the plunger body is rotated a quarter of a turn (figure 10). Both series of harpoons (33) and (34) are pressed radially by the shape of the cam surface of the cam keyholes.As the tabs align with the long keyholes at the end of the quarter turn, they resiliently clamp towards They are arranged in order to make the rear tongue (34) clamp out in the keyhole beyond the top of the long keyhole. n Figure 11 in more detail. Now the plunger body can be freely slid towards the cover with the needle coming out from the front end of the cover. As shown in Figure 12, the plunger body slides to the front latch (23) of the fasteners (20) in the rear fastener at the end of the plunger body on the transverse stops of the cam keyhole (45) . The plunger is oriented so that the rear plunger clips (25) are at 90 ° for the front harpoon hooks (32). In this position, the lateral stops (30) of the rear end of the plunger make butt contact with the stops (41) of the long keyhole, with the rear ramp hitch (24) outside the cover. The piston body is now immobilized inside the cover against another insertion, and removal. The cylinder and plunger head, forming a pre-packaged dosage of specific fluid, is now inserted over the plunger head and cover. This causes the rear end of the needle (16) to pierce the end (12) of the projection and enter the conduit (9), thereby forming a complete conduit from the rear end of the plunger head, through the needle and the body of the plunger, to the free end of the needle that comes out of the cover. It will be appreciated that at least a portion of the head of the plunger having reciprocating movement within the cylinder must remain outside the cover, to avoid the need for intermediate seals, and a tightening mechanism for removing the plunger. This position is shown in figure 14. Another pressing of the cylinder on the plunger, with the finger resting on the finger handles (48) causes a discharge of fluid in the plunger through the head of the plunger and out of the needle . In the fully depressed position, the rear end of the cylinder ace abuts the plunger head, (figure 15). In order to unlock the plunger head and the piston body, the cylinder is further depressed to make the front protrusions of the plunger head (13) slide further on the rear end of the plunger body (24). This is shown in Figure 16, and in detail in Figure 4. With the head of the piston contained within the cylinder, it can not extend outwardly away from the ramp hooks (20) and in the flange of the plunger head ( 13) runs on the slope of the ramp hitch (24), thus pushing it inward, and moving in ramp hitch (23) from its position engaged on the stop (45) .The cylinder is now removed from the cover, taking the head of the plunger and "the piston .with this low" The friction force - the lattice holders (33) and (34) ~ slide into the "long" keyhole until they engage in the upper part at the "rear end" of the cover. Figure 18, the rear harpoon clips (34) are secured in the stops (41) of the long keyhole, and the harpoon clips (33) and (34) are coupled against the stops (41). The plunger is now immobil in the position in the long keyholes, with the stops (41) engaged in the space (35) between the harpoon clips, this can not be removed, nor "inserted", and any rotation is suppressed by the dovetail edges (42) of the long keyhole. The cylinder can also be slid just outside the piston body if desired, but the needle is inside the cover to be completely contained in it, and safe from any accidental contact. With reference to figures 19 to 23, an alternative modality is shown. A cylinder (51) is substantially similar to the cylinder of the first embodiment of figures 18, except that it has a "central rod (52) extending downward from a rear end" (53) passing to an end " front (54) of the cylinder. The front edges of the cylinder (55) are bevelled down towards the center of the cylinder. A "plunger (60) (FIG. 20) has an integrated plunger head (61), reciprocable inside the cylinder, and an elongate body (62) that ends in a needle that is adjusted (63) to receive a conventional hypodermic needle. The series of diametrically opposed fasteners (64) are provided at the front end adjacent to the needle attachment (63) An axial conduit (65) passes through the plunger from the head to the end of the needle. The conduit has the shape to receive the rod of the cylinder * when the cylinder slides on the piston from the head end.The "cover (70) has a" rear end (71) and the same - configuration (72) of the keyholes as described with reference to the first embodiment.The cover is tubular with handles for the fingers (73) and differs from the first mode "in that. "This has fins (74) in the form of harpoon fins, located in diametrically opposed positions to each other.This mode works substantially in the same way as the first mode, except with the plunger head. integrated (71) fasteners (74) in the "piston" body and the fins (74) in the cover are used to unlock the plunger. The latches on the plunger body (64) are movable resiliently inward, and each has a centrally located recess (66) therein. Fins (74) are part of the cover wall, and are hinged at the front end (75) with an outgoing ramp hitch (76). The slope of the ramp faces the rear so that, with the plunger in the cylinder, the fastener (74) can move under the cover in an arm movement and engage the fastener (74) in this recess ( 66). The cylinder can now be removed leaving behind the plunger, secured by the fasteners (74). This allows the fluid to be drawn into the cylinder through the needle. The fasteners (74) with the cylinder, and with the push of the fasteners (74) the fasteners (74) protrude - slightly outwardly on the surface of the cover. The fluid is discharged by pressing the cylinder on the plunger. In this discharge stroke, the beveled front end of the fins of the cylinder holds (74) the protruding sheath and lifts them out of engagement with the plunger holders (64). This position is shown in detail in Figure 23. The plunger is now held inside the rail by the frictional force, and can be removed with the cylinder-to a secure position within the cover. The recesses 66 of the fasteners (64) engage with the transverse stops of the long keyhole, immobilizing the plunger. During use, the syringe is assembled by inserting the plunger, located completely inside the cylinder, (60) ~ in the cover (70). This is done by inserting the clips (64) into the cam keyhole, pulling them to align them in the long keyholes, and sliding the cylinder and plunger all the way to the cover. The hooks (64) are bent inward to engage the fasteners (74), since the cylinder runs on the fasteners (74) and contains them with a hinge movement towards the outside.

This is shown in greater detail with reference to Figure 22.

Claims (15)

1. A syringe consisting of: a generally tubular protective cover (4; 10) carrying a plunger which engages the formations (41, 45) and having a needle end (39) and an opposite posterior end (38); a piston (2, 3; 60) including an elongated piston body (2) and a piston head (3), having a fluid conduit (14) through the head (3) and longitudinally through the body (2), the piston body being operatively locatable in "" its operative position to extend within the cover (4; 70) and to be attached by the coupling formations with the plunger (41, 45), with the head of the plunger - (3) outside the cover (4; 70) and connected to and in fluid communication with the plunger body (2); A cylinder (1; 55) which is slidable in a discharge stroke during use on the outside of the head of the operatively located piston (3) and along the cover (4; 70) to a discharge position, so as to release the coupling formations with the plunger hereby (41, 45), and tighten the released plunger (2, 3), the cylinder (1; 55) being oppositely slidable from the discharge position to remove the released plunger (2, 3) substantially from the cover (4; 70) to a secure, immobilized position relative to the cover (4; 70), characterized the cylinder (1) has the shape and dimension to be slidable on the outside of the protective cover (4; 70).

The syringe as recited in claim 1, wherein the plunger body (2) has a front end and a rear end, and front and rear plunger fasteners (33, 34 &_ 20", 21) in it, and the cover (4) has the stops (41, 45) at its rear end, the fasteners and stops of the plunger (20, 21, 33, 34, 41, 45) being arranged to allow the body of the plunger (2) is inserted to the cover (4) with the rear fasteners of the plunger (20, 21) in engagement with the stops of the cover (41, 45) and immobilizing the body of the plunger (2) against the recoil of and the insertion to the cover (4), in this rotational orientation with the cover (4) and being further arranged to allow the movement of the cylinder (1) to its discharged position to release the posterior fasteners of the plunger (20, 21) and stop "allowing the front fasteners of the plunger (33, 34) to engage the stops (41, 4.5) with the movement of the body of l plunger (2) to the immobilized, safe position.

The syringe as mentioned in claim 2, wherein the cover (4) has the first and second axial keyhole means (44, 40) the first keyhole means (44) having a transverse shape designed to guide a fastener that it rotates therein in use towards the second keyhole means (40), and the second keyhole means (40) having edges of splices designed to prevent the rotary movement of a fastener therein during use.

The syringe as mentioned in claim 3, wherein the first and second keyhole means are formed by the respective pairs of keyholes in diametrically opposite engagement (44, 40), with the pairs located at 90 ° to each other in orientation cross section of the cover (4).

5. The syringe as recited in claim 4, wherein each keyhole of a pair has a transverse fastener stop, the fastener stop (45) of the first keyhole pair being located more towards the inside of the cover than the stopper of fastener (41) of the second pair "keyhole

6. The syringe as mentioned in claim 5, in which the front fasteners of the plunger (33, 34) of the plunger body (2) form sliding guides of the keyhole , and have opposing fastener formations, a front formation being able to slide over the stops only in a forward direction, and a subsequent formation that can slide only over the stops in a reverse direction.

7. The syringe, as mentioned in claim 6, in which the posterior fasteners "of the plunger (20, 21) of the plunger body (2) have opposite gripper formations, a front gripper formation being slidable on the stops in the insert towards the cover, and a subsequent formation that makes butt contact with the stops when the plunger body (2) slides towards the cover (4) 8.

The syringe, as mentioned in claim 7, in which the training The rear fasteners of the plunger (20, 21) have the shape to cooperate with the head of the plunger (3) with the movement of the head of the plunger (3) with the cylinder (1) at the end of a stroke of the piston (3). discharge in use, for decoupling the front formation of the piston back fastener from its stop in use 9.

The syringe, as mentioned in claim 1, in which the formations that engage with the plunger in the cover (70). ) include fins with harpoon (74) arranged to couple the grooves (66) in the plunger (60).

The syringe, as mentioned in claim 9, wherein the fins (74) are part of the cover wall and project axially rearwardly from a hinge portion of the cover (70) at the end of the cover. cover needle (70), cover (70) having the free ends (75) engageable by the end (54) of the cylinder (55) at the end of a discharge stroke to realize the hinge movement of the fins ( 74) out and out of the coupling with the slots (66")

11. The syringe, as mentioned in the claim 10, in which the slots (66) are carried in diametrically opposed plunger hooks (64) extending in the direction of the axis from the plunger body (62) to the front end thereof, and are resiliently deformable inwards .

12. The syringe as mentioned in the claim 11, in which the cover (70) has the first and second axial keyhole means, the first keyhole means having a transverse shape designed to guide a fastener by rotating in this toward the second keyhole means, and the second keyhole means having rugged edges designed to prevent rotational movement of a fastener therein during use, each keyhole means having a transverse stop at the rear end of the cover (70), and in which the hooks (6"4) form sliding guides of the keyway, arranged to allow the insertion of the plunger body (62) towards the first keyhole means with the slots of the catch (66) engaged in the stop of the first keyhole means, and to allow the rotation of the plunger body (62) in this location for guiding the hooks (64) towards the second keyhole means, releasing the stopper ^ the second keyhole means in a direction of insertion of the plunger body towards the cover (70) and further to allow the separation of the plunger body (62) with the hooks (64) in the second keyhole means to a position where the slots of the hooks (66) engage the stop in the second keyhole means for immobilizing the plunger body (62) against insertion and separation.

The syringe as mentioned in any one of the preceding claims, in which the head of the plunger (3) is integrated with the body of the plunger (2).

The syringe as mentioned in any of claims 1 to 12, in which the head of the plunger (3) separates from the body of the plunger (2) and is connectable with the body of the plunger (2) to form the plunger .

15. The syringe, according to any one of the preceding claims, the protective cover (4) and the body the plunger (2) being operably locatable one in relation to the other before use in a packed state in which the end of the elongated body of the plunger (2) remote from the end of the head of the plunger engages in the formation that engages the plunger (41, 45), the fluid conduit being formed by a hypodermic needle (14) which runs to all the way through the body of the plunger (2) with its front end (15) extending -out of the body of the plunger (2) and contained inside and protected by the cover (4), and with its rear end (15) contained inside and protected by the plunger body (2).