KR20100087076A - Safety syringe with plunger locking means - Google Patents

Abstract

 It relates to a safety syringe (11). The safety syringe has a retractable needle device 14/15 coupled thereto, which includes a barrel 12, a plunger 13 and a needle assembly. When the needle has been used once, the needle is drawn into the barrel of the syringe by engagement between the needle assembly and the end of the plunger once the injection is complete. A preferred locking means 28 in the form of a locking bush is provided in the body of the syringe to engage the plunger when it is drawn after the needle has been used, so that the syringe can no longer be used.

Description

Safety syringe with plunger locking means {SAFETY SYRINGE WITH PLUNGER LOCKING MEANS}

The present invention provides a safety syringe with a retractable needle for use by a doctor or dentist or for personal medicine administration to prevent medical, surgical or other needle operators from being damaged by the needle after using the syringe. It is about. In particular, it relates to locking means for holding a plunger at the position where the needle is attached and the needle is retracted.

For medical practitioners who use needles in a typical work environment, the risk of infection and the possibility of infection from HIV or hepatitis B virus is well known.

Furthermore, if a needle once used is reused in an unsterilised form, the person who habitually administers the drug to him or her is in contact with certain viruses, or indeed other contact viruses, and develops a severe risk. .

Many proposals have focused on reducing the number of injuries called needle stick injuries, and various attempts have been made to provide a safety system for handling needles used once. There are defects.

Many solutions to the aforementioned problems provide for the purpose of retractable needles. One of the major drawbacks in many of the various proposals is that with a retracted needle, although safe at first, the syringe does not provide a means to prevent further access to the needle. In other words, the plunger may be pressed again to retract the needle from the barrel of the syringe, or as with other cases, the plunger may be withdrawn from the syringe barrel, thereby allowing access to the needle. .

It is an object of the present invention to solve some or all of the above mentioned disadvantages to some extent or at least ameliorate them by using a retractable surgical needle in order to permanently store a surgical needle once used in a substantially safe manner. Provide a syringe. In particular, the present invention provides for the purpose of a positive locking facility to prevent the syringe with the withdrawn needle from being used again or withdrawn when the syringe with the withdrawn needle can be secured. do. The present invention provides an alternative means for handling the needle of the syringe used to prevent the occurrence of a sudden injury due to unwanted contact with the exposed needle of the syringe used at least once.

Although the following descriptions generally refer to conventionally sized syringes, the present invention is not so limited, and the referenced syringe may be used to handle any other needle / syringe combination or needle alone, including suitably adapted slimline syringes. It is meant as, and the present invention can be usefully applied.

According to the present invention there is provided a safety syringe with a retractable needle device coupled to a syringe, the syringe comprising a barrel, a plunger, and a needle assembly, where the needle is used once Upon completion, the needle is drawn into the barrel of the syringe by engagement between the needle assembly and the end of the plunger, and when the needle is drawn after being used, the locking means is in the form of a ring to engage the plunger. It is provided on the back of the body, so that the syringe cannot be used again. This is because the plunger cannot be pressed down again by the reaction of the needle or is removed together from the barrel of the syringe to prevent access to the needle; And the fitting of the ring to the plunger is facilitated by the plunger comprising two parts which are connected after the ring is fitted therein.

Preferably, a region of weakness is provided in the plunger, which is located on the shaft of the plunger in the vicinity extending from the distal end of the syringe body when fully drawn out such that the needle is drawn into the syringe body and the plunger is After engaging the locking means, the plunger is destroyed so that it cannot be pressed again, or it is easily removed by holding the plunger and applying force to further assist the syringe in not being used again.

While it has been demonstrated in the present invention to be improved by the possibility that the plunger can be destroyed, it will be understood that the extra steps and the user should be recognized as negligible. Therefore, the present invention provides a locking means that can be of sufficient resistance to prevent the plunger from being pressed or removed so that breaking of the plunger is not a problem. In other words, even when the plunger is destroyed, it can be appreciated in the present invention that the syringe is not intentionally or even accidentally reused, for example when placed on a table.

The fitting of the bush or ring to the plunger is achieved by having a two part plunger, where the two parts are fitted after the ring is fitted against the shank of the plunger. Various means by which this can be achieved include the tab of the thumb having the distal end of the plunger separated until the shank or ring or bush of two parts of the plunger can be fitted together after the ring has been positioned in one part. .

The bush or ring may be varied such that the bush or ring engages the needle and engages the plunger when drawn out into the barrel of the syringe, including but not limited to twisting or pulling the plunger through or into the bush as in the above case. Use one of the methods. In such bushes where twisting motion is desired, the bush may be a twist-lock bush or a threaded bush, or a luer-lock type bush Can be. Alternatively, in embodiments where pull motion is desired, the bush may be a pull-lock bush or a snaplock bush. Examples of such bushes are shown in the accompanying drawings, which are discussed below in connection with the description of each drawing.

Thus, in the embodiment described above, the bush is pressed into the barrel when the plunger is inserted / inserted during manufacture. Various locking methods can also be used to hold the bush in the barrel. Any combination of locking mechanisms that hold the plunger of the locking bush may be combined with one of such means in which the bush itself is held in the barrel of the syringe.

It will be appreciated that many other means that the bush can be used to lock the plunger are used, which can be considered within the scope of the invention.

Further, preferably, a vertical or longitudinal projection in the end of the barrel into which the bush is inserted is provided so that the bush is twisted, especially when a split bush is used or when a torsional motion is required to lock the plunger of the bush. Prevents turning.

The plunger itself has a flange around the distal end of the plunger to prevent the plunger from being pulled straight through the locking means. In this way, the syringe is safe in that it does not render the plunger unusable against being pressed again, but also prevents the plunger with the attached needle from being removed together. In this way, when the plunger is submerged in the bush, neither the plunger nor the bush itself is withdrawn, otherwise it can be withdrawn into the barrel and then accessed with a needle located in the barrel.

Thus, preferably the locking of the plunger in the bush is provided by a flange located on the plunger, preferably directly above the piston region of the plunger, thereby allowing the plunger to be locked against the bottom of the bush. This prevents the plunger from being drawn out entirely.

As mentioned above, by providing a break point in the plunger, this can also prevent or at least minimize the possibility of more tampering, in particular removal by force or excessive force trying to return into the barrel. To prevent plunger access.

Thus, for example, one preferred embodiment utilizes a torsion locking feature that includes corresponding threaded regions in the barrel of the syringe and on the plunger, such that the plunger is withdrawn and locked in place by screwing the plunger after injection. Engage with the wealth

Alternatively, the locking means is characterized by a torsion locking feature comprising a torsion locking bush having helix grooves within them positioned in the barrel of the syringe and corresponding lugs positioned on the plunger to engage in the spiral grooves. Provided, by plunging the plunger after injection, the plunger with the attached needle is withdrawn and locked in place to engage lugs in the corresponding spiral grooves.

Again, alternatively, the locking means is provided with a torsion locking feature comprising a torsion locking bush having lugs positioned on the plunger to engage in helical grooves and helical grooves within them located in the barrel of the syringe, thereby providing a plunger after injection. The plunger is pulled out and locked in place to allow lugs to move through the spiral grooves and pass completely through the bush.

In this embodiment, the permanent locking device is provided in the form of a ramp and other protruding forms to prevent lugs from returning through the grooves of the bush, thus plunging the bush into the barrel of the syringe. To prevent passing back through.

However, more preferably, it can be seen that the locking bush with a simple flange arrangement can be easily produced and effective. In this arrangement, the flange around the inner periphery of the bush allows the corresponding flange on the plunger to pass in one direction, but prevents their restoration due to the shape of the flanges. As mentioned above, in combination with an additional flange on the plunger, it prevents the plunger from falling out directly through the bush, which provides an effective locking against movement in the other direction.

Instead of a flange around the entire inner periphery of the bush, it can be seen that the pair of fingers function more effectively. The movement of the fingers to allow the first flange of the plunger to pass can be achieved by shaping the inner region of the barrel, so that the fingers can bend backwards as the flange of the plunger passes and the restoring force (if the first flange passes) Snap back due to resilience.

Although many of the following descriptions refer to a particular safety syringe with a retractable needle having certain features, it will be understood that the torsion locking mechanism can be used using a syringe with any type of retractable needle device. Can be.

For example, it can be seen that the present invention applies to one broad embodiment of providing a syringe, which provides a syringe with a retractable needle device coupled to the syringe, the needle being available in a known manner. And in order to function as a syringe combination, the needle is securely enclosed within the body of the syringe in the first storage position before use, and the needle and syringe combination are useful in a known manner in the second storage position at the use position. In a safety syringe, which extends from the body of the syringe to function, and then the needle is pulled back into the body of the syringe so that the needle is restored to the first storage position if the needle is used, the syringe comprises a body and a plunger, the plunger Positioned in the body of the syringe to hold the needle in the syringe body in a first storage position And means associated with their ends contained within the body of the syringe to releasably engage the boss of the needle, wherein the body of the syringe is capable of releasing the needle boss at the second storage position of the use position. Having means located at their ends facing the plunger extending from the body to keep it securely so that the needle extends from the syringe body and the plunger is used to receive a needle boss that engages the end of the syringe body; The plunger may not be engaged from the needle boss so that the plunger is withdrawn and thus fluid is received into the syringe and then used to inject the same fluid to the patient in a known manner; When the injection is complete and the needle is withdrawn from the patient, the plunger is again engaged to engage with the needle boss and withdrawn to release the needle boss from the distal end of the syringe body, so that the needle is drawn once again into the body of the syringe and the needle is plunger Remains attached to the end of; If the needle is retracted after use, a locking means is provided in the body of the syringe in the form of a ring to engage the plunger so that the syringe can be removed together from the barrel of the syringe or the plunger cannot be pressed down again in response to the needle. Can no longer be used to prevent access to The fitting of the ring to the plunger is facilitated by the plunger comprising two parts which are connected after the ring is fitted therein.

Alternatively, the present invention can be seen in another obvious embodiment of the application, for example providing a disposable retractable safety syringe with a retractable needle, where the safety syringe is slidably fitted to the hollow barrel, the barrel. , An actuator mechanism positioned in front of the plunger, and an actuator mechanism positioned in front of the barrel and adjustable through an open end in front of the hollow barrel, the actuator mechanism engaging and injecting a stem supporting the needle hub, and an actuator With the needle being positioned on the distal end of the plunger so that it is retracted with the needle upon completion, the stem of the actuator being hollow, with at least one flexible finger member, at the point where the actuator is located in the barrel, An inner flange on the barrel and a corresponding flange on the actuator mechanism, each having The flanges are shaped with inclined surfaces on one side and orthogonal surfaces on the other side, so that when the plunger is pressed, the flange of the actuator mechanism is opposed to the corresponding inner flange of the barrel by opposing orthogonal surfaces So that normal use of the actuator will not be removed from the barrel when the piston is pressed during injection under normal use conditions, and only minimal force is required to have a stem of the plunger engaged with the actuator, The locking means is provided on the body of the syringe in the form of a ring or bush so as to engage the plunger after the needle has been used and retracted after it has been used, so that the syringe cannot be pressed down again by the reaction of the needle or No longer used to remove needles from the barrel of the syringe so they are not accessible by the needle Cannot be; The fitting of the ring to the plunger is facilitated by the plunger comprising two parts which are connected after the ring is fitted therein.

Again, the plunger engages the locking bush and, preferably, snapped off at the point of break, making the syringe safe and more unusable.

As such, the present invention has particular advantages in that the needle can be safely retracted after use as well as locked in place by means of a locking bush.

The breaking of the plunger also not only makes it impossible for the syringe to be used continuously, but also means for causing the needle to come back or extend out of the syringe body, whether accidentally or intentionally interferes and also occupies a small space in the "shape" container. This provides additional safety in that it is absent.

The invention will be understood more from the non-limiting description of the preferred embodiments, wherein:
1 is a cross-sectional view of one embodiment of the invention using a locking bush according to the first aspect of the invention wherein a snap locking bush is used to hold the plunger after use;
FIG. 2 is a cross-sectional view of the plunger used in the embodiment of FIG. 1, in the form of a cap, showing a thumb tab that fits into the shank of the plunger,
3 is a cross-sectional view of the shank of the plunger and the separated separate tab for thumb;
4 is a cross-sectional view of the end of the barrel of FIG. 3 with the locking bush fitted;
5 is a cross-sectional view of a preferred embodiment of the locking bush for use of the syringe and its components, as shown in FIGS.
6 is a plan view of the locking bush of FIG.
7 and 8 are two perspective views of the bush of FIG. 5,
9 is a cross-sectional view after the end of the plunger and the bush of the previous figure are engaged.

Referring generally to the drawings, a syringe according to one aspect of the present invention is shown by reference numeral 11, wherein the syringe is a syringe body or barrel 12, a slidable plunger 13 in the syringe body or barrel and And a needle 14. The needle 14 has a hub 15. The plunger 13 is shown more clearly in FIGS. 2 and 3, which are tabs for the thumb in the form of a stem 44 and a cap located on the stem portion 44. (thumb tab) 43.

The needle hub 15 is positioned by an interference fit of the actuator 16 that fits within the distal end of the barrel 12.

The needle 14 is protected by the cover 21 prior to use.

When the plunger 13 is in contact with the needle hub 15 at the distal end of the injection, the clip means 22 is positioned in the needle hub 15 to engage with the distal end of the plunger 13.

Upon entering the syringe body 12, the plunger 13 has a piston region 26 around the lower periphery of the plunger that seals against the interior of the syringe body 12. The plunger 13 has a tab 24 for the thumb that fits on a plunger stem, such as a cap, as shown in FIGS. 2 and 3.

A break groove or weaker region 27 is provided at a suitable position on the plunger 13 so that after the needle 14 is drawn into the barrel of the syringe 12, that is, as described below. Can be destroyed after use together.

The locking bush or ring 28 is located in the rear or upper region of the barrel 12. The bush is first fitted on the shaft or stem 44 of the plunger 13 during assembly, and the tab 24 for the thumb is snapped on the shaft 44, for example in FIGS. 2 to FIG. It is held in place by suitable means, using mechanical means such as the snap lock device shown in 3, or adhesive or welding means.

Detailed views of the locking bush 28, and the relevant parts of the syringe 11 pertaining to the use of the syringe, are shown in detail in FIGS. 4 to 9.

5 to 8, the locking bush 28 has a flange 30 positioned around its periphery, and the pair of fingers 31 is a circumference located near the distal region of the plunger 13. It is up to the bush 28 to conform to the corresponding circumferential groove region 32 located between the flanges 33 and 34. The flange 33 and the fingers 31 are moderately inclined on one side to facilitate passage, but the surfaces on the other side are effectively parallel to each other to prevent restoration.

Referring again to FIG. 4, similarly, the profile of the interior region 35 at the end of the barrel 12 is the groove in which the flange 30 is positioned to engage with the appropriate incline needed to assist the accessory. By showing, it is shown that the ease of fitting and the holding of the bush 28 in the barrel are particularly possible. In particular, when the recess 37 is in place, the recess 37 is provided behind the fingers 31 of the bush 28 (shown in FIG. 1), so that the fingers 31 are The distal end of the plunger 13 can be deformed as it engages with it.

When fitted to the barrel 12, a flange 38 is also positioned around the periphery of the bush to strengthen the bush and aid in the alignment of the bush 28. In essence, when the plunger is fully drawn into the bush or ring and a force is applied thereon, the flange 38 stops the bush twisting, popping out.

In particular, the first flange 33 can pass by pushing the fingers 31 into the recess 37 so that the region of the plunger 13 passes the fingers 31 of the bush 28. The second flange 34 has a diameter larger than the diameter of the flange 33 to prevent the fingers 31 from passing through, so that when the fingers 31 engage the groove 36, the plunger 13 Lock). The plunger 13 may not be pulled through the bush 28 by the flange 34 or pressed again by the flange 33.

Thus, in use, after the injection is completed, the plunger 13 is pushed in to engage the needle hub 15. The plunger 13 engaged with the needle 14 is then drawn in, whereby the needle 14 is withdrawn into the barrel 12, after which the plunger 13 is fully pulled back to the flanges 33 and 34. Engaged with the locking bush 28 and preventing the plunger from moving in either direction when the fingers 31 engage the grooves 36 positioned between them.

Thereafter, the plunger 13 breaks at the breaking point 27. As the plunger 13 becomes unusable and the needle 14 is drawn into the body 12 of the syringe 11, it becomes totally unusable and thus can be safely placed.

10 to 12, three alternative embodiments are shown showing two partial plunger arrangements. In FIG. 10, the stem of the plunger 13 is divided into two components 41 and 42, and the thumb tab 43 of FIGS. 11 and 12 is prior to assembly, ie in some cases bush or ring. Prior to being assembled to fit on the stem portion of this plunger, it is separated from the stem 44, which parts are connected after the ring or bush is fitted. Next, the plunger is fitted to the barrel and the bush or ring is locked in place. Alternatively, as in this case, the portion 41 or 44 is fixed to the barrel during assembly, the ring or bush is adapted to it, and then the position 42 or 43 is adapted to the portion 41 or 44, respectively. Lose.

Those skilled in the art will recognize that many modifications and variations can be made to the embodiments set forth herein without departing from the technical scope and scope of the invention.

Throughout this application, the term “comprise” and its derivatives may have an inclusive rather than an exclusive meaning, unless the context otherwise requires.

The invention described herein has the utility of providing an alternative means for a safe syringe with a retractable needle device that makes the plunger locked and broken after injection, making it unusable.

Claims (24)

A safety syringe with a retractable needle device coupled to a syringe,
The syringe comprises a barrel, a plunger, and a needle assembly,
When the needle is used once, the needle is drawn into the barrel of the syringe by engagement between the needle assembly and the end of the plunger once the injection is complete,
Once the needle has been used and retracted, a locking means is provided on the back of the body of the syringe in the form of a ring or bush so that it engages with the plunger, the needle / syringe being pushed down again by the reaction of the needle. Cannot be used anymore, or removed together from the syringe barrel to prevent access to the needle,
The accessory of the ring to the plunger is facilitated by a plunger comprising two parts which are connected after the ring is fitted therein. The method of claim 1,
A weak area is provided in the plunger, which is located on the shaft of the plunger in the vicinity extending from the distal end of the syringe body when fully drawn out such that the needle is drawn into the body of the syringe and the plunger is engaged with the locking means. And then the plunger is destroyed such that it is impossible for the syringe to be used again. The method according to claim 1 or 2,
And the bush is pressed into the barrel after the plunger is inserted. The method according to any one of claims 1 to 3,
A suitable locking mechanism for holding the plunger in the locking bush is connected with suitable means by which the bush itself is held in the barrel of the syringe. The method according to any one of claims 1 to 4,
A safety syringe, characterized in that a vertical or vertical projection is provided in the end of the barrel into which the bush is inserted, thereby preventing the bush from twisting. The method according to any one of claims 1 to 5,
And the plunger has a flange around the distal end of the plunger to prevent the plunger from being pulled straight through the locking means. The method according to claim 6,
The plunger can be locked against the bottom of the bush and prevents the plunger from being pulled out entirely. The method according to any one of claims 1 to 7,
And the bush utilizes torsion or pull of the plunger through or into the bush. The method of claim 8,
Wherein said bush is a torsion-lock bush and said torsion is provided by a threaded bush or a luer-lock bush. The method according to claim 8 or 9,
The syringe utilizes a torsion locking feature that includes corresponding threaded regions within the barrel of the syringe and on the plunger, such that the plunger is withdrawn and locked in place to engage the corresponding threaded portions by twisting the plunger after injection. Safety syringe, characterized in that. The method according to claim 8 or 9,
The syringe uses locking means in the form of a torsion locking feature comprising spiral grooves therein located in the barrel of the syringe, and corresponding lugs positioned on the plunger for engagement in the spiral grooves, after injection. Wherein the plunger is withdrawn and locked in place to engage the lugs in the corresponding spiral grooves. The method according to claim 8 or 9,
The locking means is provided with a torsion locking feature comprising helical grooves within them located in the barrel of the syringe and lugs positioned on the plunger for engagement in the helical grooves, thereby allowing the plunger to A safety syringe, drawn out and locked in place to allow the lugs to move through the corresponding spiral grooves and pass completely through the bush. The method according to claim 8 or 9,
The locking means is provided by a bush having two spiral grooves coinciding with the two lugs on the plunger, the two spiral grooves engaging the two spiral grooves when the plunger is retracted and And locking the plunger (13) as the plunger is twisted. The method according to claim 8 or 9,
The locking means is in the form of a bush having a thread, and as the plunger is retracted and the thread engages with the corresponding thread on the plunger, rotation stops at the arrival of a shoulder in the bush, and at the same time And the flange on the piston is locked on the bottom of the threaded bush. The method according to any one of claims 1 to 7,
And the bush is a full-lock bush or a snap-lock bush. The method of claim 15,
The locking means has an inclined or other protruding shape to prevent the lugs from being restored through the grooves of the bush, thereby preventing the plunger from passing back through the bush into the barrel of the syringe. Safety syringe. 17. The method of claim 16,
The flange is located around the inner periphery of the bush to allow the corresponding flange on the plunger to pass in one direction, but due to the shape of the flanges to prevent their restoration and in combination with the additional flange on the plunger described above. A safety syringe, preventing the plunger from being immediately pulled out through a bush that provides an effective lock against movement in the other direction. 17. The method of claim 16,
Hind pairs of fingers are interlocked with the first flange of the plunger by the shape of the flanges and the shape of the inner region of the barrel in an inclined arrangement such that the fingers pass as the flange of the plunger passes. And the back is bent back by the restoring force when the first flange is passed. 17. The method of claim 16,
The locking bush has a locking taper and step therein, tapered locking fingers by extending them to penetrate the plunger as it enters through a snap-lock tapered flange. An interlocking snap-lock bush, the tapered fingers snap back around the plunger taper, and one of the two steps is locked on the plunger and the other is locked on top of the fingers in the bush, so that the plunger Safety syringe, characterized in that it is impossible to be pushed down or otherwise pulled. The needle is securely enclosed in the body of the syringe in the first storage position prior to use, in the second position of the use position the needle extends from the body of the syringe to function as a useful needle and syringe combination in a known manner, A safety syringe according to claim 1, wherein the needle is retracted into the body of the syringe such that the needle is returned to the first storage position if the needle is used. ,
The syringe comprises a body and a plunger;
The plunger has means associated with their ends contained in the body of the syringe to releasably engage the boss of the needle positioned on the syringe body to maintain the needle in the syringe body in the first storage position,
The body of the syringe has means located at their distal ends facing the plunger extending from the body releasably holding the needle boss in the second position of the use position such that the needle extends from the syringe body and the plunger is Used to receive the needle boss in engagement with the distal end of the syringe body;
The plunger may then not engage from the needle boss so that the plunger is withdrawn and thereby the body fluid is received into the syringe and then used to inject the patient in the same manner in a known manner;
When the injection is complete and the needle is withdrawn from the patient, the plunger is engaged to engage the needle boss once again and withdrawn so that the needle boss is released from the distal end of the syringe body so that the needle is inserted into the body of the syringe. Once retracted, the needle remains attached to the distal end of the plunger,
When the needle is retracted after use, a locking means is provided on the body of the syringe in the form of a ring to engage the plunger, such that the syringe cannot be pressed down again by the reaction of the needle or of the syringe. Can no longer be used to remove together from the barrel to prevent access to the needle; And
The accessory of the ring or bush on the plunger is facilitated by a plunger comprising two parts which are connected after the ring is fitted therein. The method of claim 20,
Two portions of the plunger comprising a stem and a separate tab for the thumb. A disposable retractable safety syringe with a retractable needle, which can be fitted through a hollow barrel, a plunger slidably fitted to the barrel, a piston fitted in front of the plunger, and an open end positioned in front of the barrel and in front of the hollow barrel. A syringe comprising an actuator mechanism, wherein
The actuator mechanism has a stem supporting a needle hub and means positioned on the distal end of the plunger to engage the actuator and allow it to be retracted with the needle when injection is complete,
The stem of the actuator is hollow and has at least one flexible finger member, and at the point where the actuator is located in the barrel, there is an inner flange on the barrel and a corresponding flange on the actuator mechanism, each flange being inclined on one side. Shaped to surfaces, and to right angles on the other side, when the plunger is depressed, the flange of the actuator mechanism is locked against the corresponding inner flange of the barrel by the opposing orthogonal surfaces so that the Normal use of the actuator will not be removed from the barrel when the piston is pressed during injection under normal use conditions,
Only minimal force is required to have the stem of the plunger engaged with the actuator, reducing the inconvenience of use,
When the needle is retracted after use, a locking means is provided in the body of the syringe in the form of a ring or bush so as to engage the plunger, such that the plunger cannot be pressed down again by the reaction of the needle or Can no longer be used to remove together from the syringe barrel and prevent access to the needle;
The accessory of the ring to the plunger is facilitated by a plunger comprising two parts which are connected after the ring is fitted therein. The method according to any one of claims 20 to 22,
And after the plunger engages the locking bush, it breaks at the point of destruction to secure the syringe and prevent it from being used anymore. Safety syringe, characterized in that it has locking means for locking its plunger after use to substantially prevent the use of the syringe as described herein in connection with the figures.

Images