|Publication number||US20050054987 A1|
|Application number||US 10/971,602|
|Publication date||Mar 10, 2005|
|Filing date||Oct 21, 2004|
|Priority date||Mar 10, 1997|
|Also published as||CA2305585A1, DE69809578D1, DE69809578T2, EP1019123A1, EP1019123B1, US6159184, US6344032, US7041085, US20020045864, US20050033242, WO1999017823A1|
|Publication number||10971602, 971602, US 2005/0054987 A1, US 2005/054987 A1, US 20050054987 A1, US 20050054987A1, US 2005054987 A1, US 2005054987A1, US-A1-20050054987, US-A1-2005054987, US2005/0054987A1, US2005/054987A1, US20050054987 A1, US20050054987A1, US2005054987 A1, US2005054987A1|
|Inventors||Anthony Perez, John Firth, David Mitchell|
|Original Assignee||Safety Syringes, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (52), Referenced by (17), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of application Ser. No. 10/023,587, filed Dec. 17, 2001, which is a continuation of co-pending application Ser. No. 09/634,689, now U.S. Pat. No. 6,344,032, filed Aug. 8, 2000, which is a continuation of application Ser. No. 08/942,938 filed on Oct. 2, 1997, now U.S. Pat. No. 6,159,184, which is a continuation-in-part of application Ser. No. 08/814,199, filed Mar. 10, 1997, now U.S. Pat. No. 6,171,283, all of which are fully incorporated herein by reference.
The present invention relates generally to syringes, and more particularly to an improved syringe guard for a unit dose cartridge or pre-filled syringe and including a shield for covering the needle thereof after medication is dispensed from the syringe.
Medication is often dispensed using a unit dose medical cartridge, such as an ampule, vial or syringe, and a syringe holder, injector or adapter. The cartridge typically has a barrel with a needle at one end and a plunger at the other end. Such cartridges are often referred to as “pre-filled syringes” because they contain a specific dosage or volume of medication when they are initially provided, as compared to conventional syringes which are furnished empty and filled by the user prior to use. Alternatively, the medical cartridge may include a rubber stopper instead of a needle, or may include a piston rather than a plunger on the other end. The syringe adapter is typically a hollow body adapted to hold the cartridge, including a plunger to engage and move the piston in the cartridge.
Because of the threat of communicable diseases, a number of syringes and adapters have been developed to prevent accidental needle sticks or inadvertent reuse of needle devices. Many of these devices, however, are not easy to use or are complicated to manufacture, resulting in less effective disposable syringe devices.
For example, U.S. Pat. No. 5,569,211 discloses a syringe that allows the needle of the syringe to be withdrawn into the barrel of the syringe after medication is dispensed from it. This device, however, is a specially designed substitute for a conventional syringe, and cannot be used to hold commercially available pre-filled syringes.
U.S. Pat. No. 5,522,812 discloses a complicated syringe shield device for holding a conventional cartridge not having its own needle. The device has a number of complicated parts, including a cylindrical body, a double needle assembly, a cylindrical shield, a special collar piece allowing the shield to be drawn over the needle and locked, and a plunger assembly, resulting in a device that is potentially difficult and expensive to manufacture. The device also requires two hands to operate, one to hold the body, and one to rotate the shield into the locked position, which may be inconvenient to the medical professional using the device.
Another consideration with unit dose cartridges and pre-filled syringes is that they are often made from glass, particularly for holding certain vaccines or biotech drugs where concern about micro-organisms or other contaminants is most critical. Glass cartridges and pre-filled syringes are very fragile and often break during transportation or use. Some existing adapters may not adequately protect the syringe contained therein from such risks. Others provide greater protection for the cartridge, but may obstruct the professional's view of the syringe when the device is being used, hampering monitoring of the medication being delivered.
Therefore, there is a need for an improved safety syringe which is inexpensive and simple to manufacture.
In addition, there is a need for a safety syringe guarding mechanism which provides improved protection for the cartridge or pre-filled syringe therein, but allows effective observation of the syringe and the medication being dispensed.
The present invention is directed to a guard or adapter for a medical cartridge, such as a unit dose cartridge or pre-filled syringe, that is used to inject medication or other drugs into a patient. Generally, the guard comprises two parts, namely a housing or body for receiving and holding the cartridge, and a protective case or shield slidably attached to the body. In addition, for a cartridge provided without its own plunger, an embodiment of the guard includes a finger grip plug that is attached to the body and a plunger connectable to the piston of the cartridge. The various parts are generally molded from a suitable plastic, such as polypropylene, K-Resin® (synthetic resinous polymers of butadiene and styrene), or polycarbonate, having a clear finish.
The body generally includes two elongate rails or similar structures defining a substantially rectangular shape, having a cavity therein adapted to receive a medical cartridge or a pre-filled syringe. The body has an open proximal end communicating with the cavity, a distal end with an opening through it, and possibly a collar molded to the distal end. The body may also include a plurality of tabs or ribs extending along a portion of the cavity adapted to engage the barrel of a cartridge received therein.
The protective case or shield is a tubular member adapted to slidably fit on the body, having open proximal and distal ends. One or more elongate windows are formed in the shield, allowing observation of the cartridge or pre-filled syringe held within the body. One or more windows, preferably the same windows used for viewing the cartridge, also cooperate with a stop tab or tabs molded on the body, thereby limiting the relative sliding relationship of the shield and the body. In addition, the shield includes a set of detents, preferably comprising a pair of detent arms and protruding detents molded into the proximal end of the shield. The detents cooperate with one or more sets of detent pockets molded into the body to lock the shield in relation to the body.
The shield is generally provided pre-assembled on the body, preferably by inserting the body into the shield until the stop tabs on the body communicate with the elongate windows on the shield. The shield may then slide in relation to the body between a proximal or unguarded position and a distal or guarded position, defined by the length of the windows in the shield. The guard is generally provided with the shield in the proximal or unguarded position, wherein the stop tabs abut the distal edges of the windows. Alternatively, the proximal travel of the shield may be limited by the detent arms abutting a finger grip on the body. In the unguarded position, the detents on the shield preferably engage a set of proximal detent pockets on the body, holding the shield in relation to the body.
Generally, after the cartridge or pre-filled syringe in the guard has been used to deliver its medication, the shield is moved distally until it reaches the guarded position. In the guarded position, the stop tabs on the body abut the proximal edges of the windows, preventing further distal movement. As the shield is moved, the detents on the shield leave the proximal detent pockets, preferably because of sloping edges on the proximal detent pockets, and slide along the body until they enter a set of distal detent pockets when the shield reaches the guarded position. The distal detent pockets may have blunt or oblique proximal edges, which prevent the shield from being returned proximally, and thereby substantially lock the shield in the guarded position for disposal. Preferably, the proximal edges of the detent pockets are inclined at an angle corresponding substantially to the proximal edges of the detents to maximize bearing surface engagement therebetween.
In a first preferred embodiment, the guard has only two parts, namely a body and a shield, which are pre-assembled in the unguarded position ready to receive a cartridge. In this embodiment, the body includes a finger grip integrally molded onto its proximal end, preferably defining a “T” shape, having locking detents formed on the finger grip. A cartridge, preferably and typically a conventional unit dose pre-filled syringe including a needle and needle cover on its distal end and a plunger and flange on its proximal end, is inserted into the proximal end of the body until it is fully encapsulated within the cavity. Once fully inserted, the proximal end of the pre-filled syringe engages the locking detents on the finger grip, substantially permanently locking the pre-filled syringe into the guard. Once locked into the guard, the needle and its cover on the pre-filled syringe extend at least partially through the distal openings in the body and shield and preferably beyond their distal ends.
After medication is dispensed, the shield is slid into the guarded position, using one or two hands, preferably only requiring one hand. During use, the index and middle fingers are generally placed on the finger grip adjacent the shield, while the thumb directs the plunger on the pre-filled syringe. To move the shield, the free hand may be used to slide the shield, or the thumb and ring finger of the same hand may be moved to the finger grip to hold the body. The index and middle fingers may hold the sides of the shield and move it distally, thereby sliding the shield until it is locked in the guarded position.
In a second preferred embodiment, the guard includes an attachable finger grip plug and a plunger, in addition to the body and shield. The plunger, with or without a thumb ring, a button plunger, or a “T” handle on one end, is attachable to the piston of a conventional unit dose cartridge. The finger grip plug may include a finger grip thereon, such as a pair of wings or an octagonal flange. The finger grip plug and the proximal end of the body include cooperating members for locking the finger grip section to the body and preventing the cartridge within the body from moving substantially axially. Preferably, the finger grip plug has locking detents thereon, and the proximal end of the body includes an annular-shaped collar having tapered pockets therein adapted to receive the locking detents.
The body and shield are generally provided pre-assembled in the unguarded position, as previously described, with the finger grip plug and plunger furnished separately. A cartridge, preferably a unit dose glass cartridge having a needle and needle cover on its distal end and a piston in its proximal end, is inserted into the proximal end of the body until it is fully encapsulated within the cavity. Once fully inserted, the finger grip plug is attached to the body, by aligning the locking detents on the finger grip section with the tapered pockets in the collar. The locking detents are inserted into the pockets until they engage, substantially permanently and/or releasably enclosing the cavity and encapsulating the cartridge therein. In addition, the detents on the finger grip plug may substantially engage the proximal end of the cartridge, thereby preventing the needle on the cartridge from withdrawing proximally into the body during use.
In addition, the plunger may include a radially extending detent or tab that is compressed when the plunger is directed into the finger grip plug. The tab resiliently returns to its extended position once the plunger is fully inserted into the finger grip plug, thereby preventing the plunger from being removed therefrom.
Once the guard, cartridge and-finger grip plug are assembled, the needle and needle cap on the cartridge extend through the distal ends of the shield and body. The plunger is attached to the piston in the cartridge, such as by a threaded bore on the distal end of the plunger which is adapted to screw into a threaded nipple on the piston. The device is then ready to be used to deliver medication to a patient. After medication is dispensed, the shield is slid into the guarded position, as with the first embodiment, with one or two hands.
In additional preferred embodiments, the syringe guard includes a body and a sliding shield similar to that described above, for holding a unit dose pre-filled syringe having its own plunger. In particular, the guard includes a mechanism on the proximal end of the body, preferably on or within the finger grip, for substantially permanently (or releasably under certain conditions) securing the syringe within the guard and substantially preventing distal and/or proximal movement of the syringe received therein. More preferably, the locking mechanism requires the syringe to be inserted into the guard in a predetermined orientation, thereby facilitating viewing of a label or the like on the cartridge through the windows in the guard.
For example, the mechanism may include a clip or ring for clasping the finger grip and the proximal flange of the syringe together. Preferably, a pair of clips are provided which slide over and engage the distal and proximal surfaces respectively of the finger grip and the flange of the syringe.
Alternatively, the body may include an annular member within the open end thereof for creating an interference fit with the barrel of the syringe inserted into the guard. Preferably, an annular ring extends radially into the cavity, thereby frictionally engaging an enlarged proximal end of the syringe directed into the cavity to prevent removal of the syringe.
In a further alternative, the finger grip has a substantially rectangular shape including a recess in the proximal end for receiving the flange or the proximal end of the pre-filled syringe. One or more tabs or detents extend into the recess from one or more walls of the finger grip for engaging the flange of the syringe to secure it within the guard.
Alternatively, the finger grip may include a latch or cover for enclosing the recess once a syringe is inserted therein, the latch preferably being attached to the finger grip by a hinge along a wall defining the recess. Once the flange of the syringe is directed into the recess, the latch is closed, preferably engaging a tab within the recess to prevent the latch from coming loose and releasing the syringe. The latch also preferably includes an aperture for accommodating a plunger of the syringe received within the body.
In a final preferred embodiment, the syringe guard is adapted to receive relatively small cartridges or pre-filled syringes, for example a 0.5 mL unit dose pre-filled syringe including a rigid nose shield or needle cap having a diameter larger than the barrel of the syringe. The guard includes a body having a mechanism in its proximal end for lockably engaging the proximal end of the pre-filled syringe received therein, such as those described above. In addition, the body includes one or more semi-rigid members, for example pairs of tabs or longitudinal ribs, extending along the cavity for engaging the barrel of the syringe. The body may also include one or more lead-in ribs at or near the proximal end of the cavity for guiding the pre-filled syringe during insertion. When the syringe is inserted into the body, the cap engages the tabs as it enters the cavity. The tabs are forced radially out to allow the cap to pass through the cavity. Once the cap extends beyond the proximal end of the body, the tabs resiliently return to abut or engage the wall of the barrel, thereby preventing substantial lateral movement of the syringe within the body during use. The tabs also preferably prevent the rails of the guard body from being compressed after use to prevent inadvertent release of the cooperating locking detents on the shield and body.
As will be understood, the present invention provides an improved guard for medical cartridges or pre-filled syringes that may include as few as two parts, but generally has no more than four parts. The device may be used for a wide variety of conventional prepackaged medications or drugs, such as anesthesia, anti-thrombotic drugs, biological drugs or vaccines, for use within the medical and/or dental fields, where the cartridge or pre-filled syringe is generally disposed of after a single use. Because the device is relatively simple, the parts may be provided in standard configurations. For example, a single shield design may be provided that fits on a variety of bodies for receiving cartridges or pre-filled syringes made by different manufacturers. In addition, the distal openings in the body and/or the shield may be provided in a plurality of sizes to accommodate a variety of needle caps, luer adapters and the like. Thus, the guard may be more easily mass produced, reducing manufacturing costs, and thereby providing a more competitively priced disposable syringe guard.
In addition, the rectangular configuration of the present device provides improved rigidity, thereby affording greater protection to the cartridge held in the guard. Although the cartridge or pre-filled syringe is fully encapsulated within the guard, the windows in the guard allow the medical or dental professional to effectively monitor the cartridge or pre-filled syringe and the medication being delivered.
Finally, the slidable shield and cooperating detents allow the user to operate the guard using only one hand, thereby allowing their other hand to be free to perform other necessary tasks, such as restraining a young patient or providing improved access to the target region for the needle. Once the shield is locked in the guarded position, the device may be disposed of safely if used properly, substantially eliminating concerns that the needle may become exposed and cause an accidental stick.
Accordingly, it is a principal object of the present invention to provide an improved unit dose syringe device that is easy to manufacture and convenient to use.
It is also an object to provide an improved syringe guard that affords improved protection for a cartridge or pre-filled syringe encapsulated therein but still allows effective monitoring of the medication being dispensed.
Other objects and features of the present invention will become apparent from consideration of the following description taken in conjunction with the accompanying drawings.
For a better understanding of the invention, and to show how it may be carried into effect, reference will be made, by way of example, to the accompanying drawings, in which:
Turning to the drawings,
In addition, the body 20 has a substantially rigid collar 32 on the distal end 24, and a finger grip 50 on the proximal end 22, both attached to or preferably integrally molded onto the body 20. Alternatively, instead of comprising side rails 28, the body 20 may comprise a substantially rectangular body having four side walls (not shown).
The two side rails 28 generally have a “C” shape and define a cavity 26 in the body 20, the cavity 26 extending axially from the proximal end 22 to the distal end 24 of the body 20. The inside surface 30 of the rails 28 is preferably concave, conforming substantially to the outer diameter of a standard unit dose pre-filled syringe. Alternatively, if the side rails 28 have a flat or “C” channel inside surface 30, guide rails (not shown) or the like may be provided on the inside surface 30 to direct the pre-filled syringe 90 (
As shown in
The distal end 24 may include an expandable “collet” (not shown) defined by a plurality of longitudinal slots extending proximally a short distance from the distal end 24. The collet may have a diameter smaller than that of the syringe barrel, hub or needle cap as desired, thereby allowing the distal end 24 to be resiliently expanded to substantially engage the syringe received therein. In a further alternative, the opening 34 in the distal end 24 may have a sufficiently large diameter to freely allow the distal end of the pre-filled syringe to extend therethrough, the pre-filled syringe being locked substantially within the body exclusively by a locking mechanism on the proximal end 22 or finger grip 50 of the body 20, as described more particularly below, and not by a collar on the distal end 24.
The side rails 28 define two elongate openings or windows 36 extending longitudinally between the finger grip 50 and the distal end 24, allowing observation of the pre-filled syringe held in the body 20. Alternatively, if a four-walled body is provided, an elongate opening or window may be integrally formed in one or more of the side walls, preferably in two walls on opposite sides of the body 20. The body 20 also includes one or more stop tabs 38 attached or molded directly to the body 20. Preferably, stop tabs 38 are molded onto the body 20 on two opposite sides of the distal end 24 of the body 20.
The body 20 also includes one or more sets of detent pockets, preferably having a set of proximal detent pockets 40 adjacent the finger grip 50, and a set of distal detent pockets 42 at a more distal location on the body 20. The detent pockets lock the relative movement between the shield 60 and body 20, as is explained more fully below.
Turning now to
The detents 71 preferably have shapes corresponding substantially to the shapes of the detent pockets 40, 42 in the body 20. The proximal edges 71 b are blunt or preferably oblique to engage the proximal surfaces 40 b or 42 b as described below and to maximize bearing surface area, particularly to stabilize a shorter guard 10. In addition, the detent arms 70 may include indents 170 for controlling the flexural strength of the detent arms 70 as the arms 70 vary in size and thickness in embodiments adapted to accommodate a variety of syringes.
At least one wall 61 a, preferably the two opposite walls 61 a, includes an elongate opening or window 64 therethrough. The window 64 allows observation of the pre-filled syringe received in the body 20, and also provides a traveling slot for the stop tab 38 on the body 20. The window 64 has a proximal edge 66 and a distal edge 68 defined by the wall 61 a which limit the relative movement of the shield 60 to the body 20, as will be explained more fully below. Alternatively, the window 64 may be divided by a cross-member (not shown) molded into the wall 61 a which extends transversely across the window 64 if it is desired to further limit the movement of the shield 60.
Optionally, the side walls 61 a, 61 b may include wings, a ring or similar finger holds (not shown) extending radially from the shield 60 to ease movement of the shield 60 in relation to the body 20. In addition, the side walls 61 a, 61 b may provide a flat surface onto which a label may be applied, for example to identify the drug or other fluid contained within the pre-filled syringe 90 received within the guard 10, or an embossed pattern may be molded, possibly including a name or a logo.
Together, the stop tab 38 and window 64 allow the shield 60 to slidably move in relation to the body 20, but substantially define the limits of that relative movement. The shield 60 may slide proximally and distally until the stop tab 38 abuts a distal edge 68 and a proximal edge 66, respectively, of the window 64. Specifically, when the stop tab 38 engages the distal edge 68 of the window 64, as shown in
Turning again to
The distal end 94 of the pre-filled syringe 90 is inserted into the recess 51 of the finger grip 50 and the open proximal end 22 of the body 20. The pre-filled syringe 90 enters the cavity 26 and progresses distally until the distal end 94 of the pre-filled syringe 90 becomes coextensive with and/or directly engages the distal end 24 of the body 20. The distal end 94 of the pre-filled syringe 90 may simply abut the distal end 24 of the body 20, or alternatively the distal end 94 may partially enter the opening 34 and engage the collar 32, thereby providing additional protection from lateral movement of the pre-filled syringe 90 (
As the pre-filled syringe 90 becomes fully encapsulated within the cavity 26, the flange 96 on the proximal end 93 of the pre-filled syringe 90 contacts the locking detents 58 on the finger grip 50. The locking detents 58 have tapered proximal edges 58 a, allowing the pre-filled syringe 90 to be directed further distally, the flange 96 moving the locking detents 58 aside and entering the slot 57. As is shown in
Although the pre-filled syringe 90 is considered substantially permanently encapsulated within the guard 10, the material of the finger grip 50 may have sufficient flexibility to allow a tool (not shown) to move the detents 58 to allow the pre-filled syringe 90 to be removed from the body 20. Preferably, the tool applies a distal force to each of the proximal edges 56a of the outer surface 56, causing the lateral surfaces 55 and detents 58 to expand outward to release the flange 96. Alternatively, the tool may engage the lateral surfaces 55 directly and force them outward to release the flange 96 from the slots 57.
Thus, if an incorrect pre-filled syringe 90 is inserted into the guard 10 during factory assembly, it may be released from the guard 10 without damaging the guard 10 and/or the pre-filled syringe 90, thereby allowing both to be reused. This may be particularly important for pre-filled glass syringes for which the flange 96 is often structurally the weakest point of the pre-filled syringe 90. Thus, a pre-filled glass syringe 90 may be releasably encapsulated within the guard 10, allowing removal of the syringe 90 under certain controlled conditions. The finger grip 50, however, is sufficiently rigid that, during normal use for example by a medical professional, the pre-filled syringe 90 will not be removable from the guard 10.
In addition, the generally rectangular-shaped flange 96 may establish a preferred orientation for the pre-filled syringe 90 to be received in the guard 10. Preferably, the shape of the flange 96 allows the pre-filled syringe 90 to be received within the slots 57 only in an orientation that allows the label 92 a to be visible through the window 64 of the guard 10 during use (see
The opening 65 is generally circular and has a diameter larger than that of the syringe barrel 92 and/or hub 94, and may be provided with a variety of diameters or configurations to facilitate use of the pre-filled syringe 90.. For example, the diameter of the opening 65 may be sufficiently large to allow a luer adapter (not shown) or other alternative distal tip to be provided on the pre-filled syringe 90 or to be attached to the hub 94 during use. Most preferably, however, the opening 65 has a diameter sufficiently small to minimize the risk of accidental sticks, for example to prevent a finger from being directed into the shield 60 after use.
The pre-filled syringe 90 encapsulated within the guard 10 may then be used in a conventional manner to deliver the medication in the barrel 92. The medical professional typically holds the pre-filled syringe by placing his or her index finger on a finger ledge 54, his or her middle finger on the other finger ledge 54, and his or her thumb on the end 99 of the plunger 98. The cover (not shown) is removed, the needle 95 is inserted into the patient, and the medication is delivered by directing the plunger 98 distally with the thumb. As can be seen from
After the medication is dispensed, the needle 95 is withdrawn from the patient, and the self-shielding feature of the guard 10 is engaged. The user holds the body 20, typically by placing his ring finger on the gripping surface 56 adjacent his middle finger, and moving his thumb from the plunger 98 to the other gripping surface 56. The index and middle fingers, already adjacent the side walls 61 b of the shield 60, grip the walls 61 b and are moved distally, thereby sliding the shield 60 distally until it reaches the guarded position, shown in
Because the cooperating detents 71 and detent pockets 40 hold the shield 60 in the unguarded position, force must be applied to move the shield 60 distally. As previously discussed, the detents 71 have sloping distal edges 71 a and blunt or oblique proximal edges 71 b (
As shown in
As can be seen from
Turning now to
The two side rails 28 have concave inside surfaces 30 conforming substantially to the outer diameter of a standard unit dose cartridge (not shown in
Turning now to
The two opposite walls 61 a each include elongate windows 64 a, 64 b which allow observation of the cartridge in the body 20. The distal window 64 a also provides a traveling slot for the stop tab 38 on the body 20. Each window 64 a has a proximal edge 66 defined by a cross-member 164 and a distal edge 68 defined by the wall 61 a. The windows 64 a and the stop tabs 38 together limit the relative movement of the body 20 and the shield 60, as previously described.
Referring now to
In addition, the plunger 120 may also include a one-way locking member that allows the plunger 120 to be substantially permanently inserted into the finger grip plug 130. Preferably, as shown in
The pre-assembled body 20 and shield 60 are then ready to receive a cartridge, such as the conventional unit dose glass cartridges 190 a and 190 b shown in
Turning again to
Preferably, when the finger grip plug 130 is locked onto the body 20, the cartridge 190 is simultaneously encapsulated within the cavity 26 (
In addition, the body 20 may be used to encapsulate a cartridge 190 that is substantially shorter than the length of the body 20 but has a similar diameter to that of the cavity 26. As shown in
The tabs 240 are ramped distally inward, thereby allowing the hub 94 to be directed distally past the tabs 240, forcing the tabs 240 slightly outward. Once the hub 94 extends beyond the tabs 240, the tabs 240 resiliently snap back inward, the blunt distal edge 240 b engaging the blunt proximal edge 94 a of the hub 94. Thus, the opening 34 substantially prevents distal movement of the cartridge 190, while the tabs 240 prevent proximal movement.
Alternatively, the cavity 26 may include one or more tabs, annular ridges or similar retaining detents (not shown) at predetermined locations in the body 20 corresponding to the length of one or more short cartridges. When the cartridge 190 is directed into the body 20, the smooth-walled barrel 92 passes freely over the tab or ridge, preferably facilitated by a ramped proximal edge thereof. When the cartridge 190 is fully inserted into the body 20, the needle 95 should extend beyond the distal end 24 and the proximal end 93 should be engaged by a blunt distal edge of the tab or ridge, thereby preventing the cartridge 190 from withdrawing proximally into body 20 during use.
As shown in
The tab 220 includes a ramped distal surface 220 b which allows it to be forced inward when the distal end 126 of the plunger 120 is directed into the passage 140. Once the tab 220 passes distally beyond the lip 142, it resiliently returns to its outward extended position. If the plunger 120 is drawn proximally, the blunt proximal edge 220 a abuts the lip 142, thereby preventing the plunger 120 from being pulled out of the finger grip plug 130. In addition, the plunger shaft 122 may have a cross-section similar in size to the passage, preventing the fingers 138 from being forced radially inward and thereby further securing the finger grip plug 130 to the body 20 of the syringe guard 10.
After the medication is dispensed, the needle 95 is withdrawn from the patient, and the self-shielding feature of the guard 10 is engaged, similar to the procedure described previously. As the shield 60 is moved distally, the detents 70 leave the proximal detent pockets 40. When the shield reaches the guarded position, the detents 71 enter the distal detent pockets 42, locking the shield 60.
Turning now to
The syringe guard 10 also includes a finger grip 150 and a detachable clip or ring 160 for securing the pre-filled syringe 90 to the proximal end 22 of the syringe guard 10. The finger grip 150 includes a pair of wings 152 having a distal surface 154 and a proximal surface 156. Preferably, the wings 152 have a shape substantially similar to the flange 96 on the proximal end 93 of the syringe 90. The clip 160 preferably includes a pair of similarly or identically shaped members, defining a “C” cross-section. The clip 160 includes a cavity 162 having a shape for substantially engaging the finger grip 150 and the flange 96, and includes an aperture 164 for accommodating the plunger (not shown) of the pre-filled syringe 90, the cavity 162 and aperture 164 together defining a plurality of substantially rigid retaining fingers 166.
During use, the pre-filled syringe 90 is introduced into the cavity 26 within the body 20 until the distal edge 96 a of the flange 96 abuts the proximal surface 156 of the finger grip 150, and the needle 95 extends beyond the distal end 24 of the body 20. A clip 160 is then directed over the flange 96 and each finger grip wing 152, the retaining fingers 166 substantially engaging the respective proximal and distal surfaces 93 b, 154.
Thus, the clips 160 prevent the pre-filled syringe 90 from moving axially (i.e. distally and/or proximally) within the guard 10. In addition, the clips 160 may be sufficiently rigid to prevent the proximal end 94 of the pre-filled syringe 90 from moving substantially laterally during use, thereby possibly eliminating the need for a retaining collar on the proximal end of the body 20. In addition, the apertures 164 on the clips 160 allow the plunger (not shown) to be freely directed distally and/or proximally to dispense medication as desired without substantial interference by the clips 160. In addition, the clips 160 and/or the surfaces 93 a, 154 may include cooperating tabs and pockets (not shown) for locking the clips 160, although the clips 160 may be sufficiently retained by friction and/or force fitting them into place.
Alternatively, a detachable ring or clip (not shown) may be provided instead of the pair of clips 160. The ring may be a single hinged piece, with a plurality of retaining fingers or having a recessed perimeter, that may be wrapped around the plunger to engage the finger grip 150 and the flange 96.
Turning now to
Preferably, the annular ring 174 defines a diameter slightly smaller than the outer diameter of the proximal hub 192 of the syringe 90. Alternatively, the annular ring 174 may define a diameter slightly smaller than the barrel 92 itself, or the ring may define an intermittent annular shape (not shown).
A pre-filled syringe 90 may be directed into the cavity 26, the proximal hub 192 engaging the annular ring 174. This creates an interference or frictional fit between the annular ring 174 and the proximal hub 192, thereby substantially retaining the pre-filled syringe 90 within the body 20.
In addition, the finger grip 250 preferably has a substantially rectangular shape corresponding to the generally rectangular shape of the flange 96 on the conventional unit dose pre-filled syringe 90. Thus, the flange 96 may be securely received within a recess 251 within the finger grip 250, thereby preventing the pre-filled syringe 90 from being rotated along its longitudinal axis when encapsulated within the body 20, for example to facilitate observation of a label (not shown) on the barrel-92 through the window 64.
Preferably, a pair of tabs 258 are integrally formed along the opposite substantially flat walls, for example along outer gripping surfaces s 256, extending into the recess 251 (
During use, a pre-filled syringe 90 may be introduced into the body 20 until the flange 96 begins to enter the recess 251 defined by the finger grip 250. The flange 96 engages the ramped proximal surfaces 258 a of the tabs 258, forcing the tabs 258 radially outward until the flange 96 substantially enters the recess 251. The tabs 258 then resiliently return radially in, the blunt distal surfaces 258 b of the tabs 258 substantially engaging the proximal end 93 of the pre-filled syringe 90, thereby substantially preventing the pre-filled syringe 90 from withdrawing proximally from the body 20. Preferably, the pre-filled syringe 90 includes an enlarged proximal hub (see
Alternatively, as shown in
A pre-filled syringe 90 may be directed into the body 20 until the flange 96 substantially enters the recess 251 and abuts the lower surface 254 a. The latch 260 may then be folded along the hinge 261 until it enters the recess 251. The ramped edge 266 a forces the tab 266 radially outward, thereby allowing the latch 260 to enter the recess 251. The blunt distal edge 266 b then engages the fingers 264, thereby substantially enclosing the recess 251 and preventing the pre-filled syringe 90 from moving proximally from the guard 10 during use.
In a final preferred embodiment, shown in
Generally, the guard 10 includes a body 20 having a locking mechanism in its proximal end for lockably engaging the proximal end 93 and/or flange 96 of the pre-filled syringe 90 received therein, such as the locking mechanisms described above. Preferably, the locking mechanism is sufficiently rigid such that the pre-filled syringe 90 may be substantially retained within the cavity 26 to prevent axial and/or lateral movement without requiring a collar on the distal end 24 of the body 20. For example, the finger grip 50 may include a plurality of locking detents 58 partially defining a slot 57, as shown in
Alternatively, the ribs 29 may be substantially rigid and the rails 28 themselves may be sufficiently flexible to deform outward as the needle protector cap 97 engages the ribs 29 to allow the cap 97 to pass distally through the cavity 26. In such an embodiment, however, the pre-filled syringe 90 may have to be inserted into the body 20 prior to directing the shield 50 thereon, or the shield 50 may have to be sufficiently flexible and resilient to accommodate the expansion of the rails.
Once the needle protector cap 97 extends beyond the distal end 24 of the body 20, the ribs 29 resiliently return to abut or engage the barrel 92 of the pre-filled syringe 90, thereby preventing substantial lateral movement of the pre-filled syringe 90 within the guard 10 during use.
More preferably, the ribs 29 preferably engage the barrel 92 to enhance the rigidity of the body 20, that is, to prevent the rails 28 from being deflected inward which may release the shield 60 from the guarded position. For example, as can be seen in
Although the rails 28 are substantially rigid, they may be slightly compressible because of the space between the rails 28 and the barrel 92, which may allow inadvertent release of the detents 71 from the pockets 42 and undesired proximal movement of the shield 60. The ribs 29 provide additional rigidity, for example by substantially engaging the barrel 92, to prevent compression of the rails 28 and thereby improve the safety feature of the shield 60 and cooperating detents 71 and pockets 42.
Alternatively, as shown in
The deflectable, resilient nature of the frame 230 facilitates the insertion of the pre-filled syringe 90 being received in the body 20. The arms 228 on the frame 230 may be deflected outward to accommodate the needle protector cap 97, but resiliently return to engage the barrel 92 with the ribs 229, thereby providing additional rigidity for the rails 28, as described above.
While the invention is susceptible to various modifications, and alternative forms, specific examples thereof have been shown in the drawings and are herein described in detail. It should be understood, however, that the invention is not to be limited to the particular forms or methods disclosed, but to the contrary, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the appended claims.
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|International Classification||A61M5/31, A61M5/315, A61M5/32|
|Cooperative Classification||A61M5/3202, A61M5/3129, A61M5/3271, A61M2005/3247, A61M2005/3139, A61M2005/31508|