WO1999053980A1 - Disposable syringe - Google Patents

Abstract

The disposable syringe comprises a barrel, a piston and a needle. The said piston is a pusher rod that has a section of multiple tabs and has a projection attached to its distal end surface. While the injection operation has been finished, the projection is completely fitted to the inside surface of the needle nozzle. The projection is provided with flexible male hooks which are engaged with the female hooks provided on the inside surface of the needle nozzle after the injection operation has been finished, so as to prevent the rod from being pulled out. The projection is also provided with a narrowed portion between itself and the distal end surface of the piston rod, in order that the engagement of the hooks makes the syringe self-locked upon the pulling outward of the pusher rod after finish injecting. Further pulling of the rod would make the syringe self-destroyed because the projection can be broken at its narrowed portion upon the pulling action.

Description

 Disposable syringe

Technical field

 The present invention relates to a syringe belonging to the field of medical equipment, and more particularly, the present invention relates to a disposable syringe.

Background technique

 The structure of existing disposable syringes often cannot guarantee that users do not reuse them. Some users reuse existing disposable syringes in order to save money. The existing disposable syringes are generally made of plastic and are not resistant. High temperature, can not be disinfected by conventional high temperature disinfection methods, repeated use will lead to cross infection between patients, especially in some more remote areas and economically underdeveloped areas, such cases often occur. Among the existing disposable syringes, there are also disposable syringes designed to be self-destructed or self-locked after a single use, but often their structures are complex and the production cost is high.

Object of the invention

 The purpose of the present invention is to provide a disposable syringe, which can ensure that the cartridge core cannot be pulled again in the barrel after one-time use. If the user pulls vigorously, the syringe will self-destruct, thereby realizing the real The purpose of single use is simple structure and low cost.

Technical solutions

 The disposable syringe of the present invention comprises a barrel, a barrel core and an injection needle. The barrel core is a push pestle with a plurality of fins, and a convex surface is connected to the surface of the piston that pushes the liquid medicine under the push rod. When the injection is completed, the nipple is fully fitted with the inside of the needle nipple at the lower end of the barrel. At the corresponding position, the nipple on the pusher piston and the needle nipple of the cylinder are provided with an elastic inverted buckle device capable of engaging with each other. When the injection is not performed, the push rod does not fully cooperate with the cylinder, but is slightly separated from the cylinder, so that the inverted buckle device of the push rod does not engage with the inverted device of the needle nipple of the cylinder, and the push rod can be Free movement inside the barrel. After pumping the liquid medicine for injection, the plunger completely enters the barrel, and the nipples on the plunger fully cooperate with the needle nipples of the barrel. The inverted buckle device on the nipple and the inverted buckle device on the needle nipple are engaged with each other to prevent the push rod from being again

 1

Confirm Pull out. The breast protrusion has a reduced diameter portion between the buckle device and the bottom surface of the push rod. Under a certain pulling force, the breast protrusion will be broken into two parts from the reduced diameter portion. When the nipple on the push rod is fully matched with the needle nipple of the cylinder, if you want to overcome the effect of the buckle device and pull the push rod strongly outward, the nipple is subject to the engagement of the buckle device and breaks from the reduced diameter Open and blocked inside the needle nipple. The purpose is to make the injection needle self-destruct after one-time use.

 According to another aspect of the present invention, for the purpose of double protection, the top of the push rod and the top of the cylinder are provided with an inverted buckle device at corresponding positions. The push rod piston pushes the end surface of the medicinal solution and the bottom surface of the cylinder. When cooperating with each other, the upside-down device on the top of the push rod and the upside-down device on the top of the cylinder are engaged with each other to achieve the effect of double protection.

 At the same time, according to the present invention, in order to prevent someone from wanting to reuse the disposable injection needle without deliberately pushing the push rod completely into the barrel, that is, a part of the medicinal solution remains in the barrel at the end of the injection, and the syringe can still be used for the next injection The present invention is designed so that the upside-down device at the top of the push rod has a different distance from the top of the push rod, so that after the push rod has been pushed into a part of the barrel, it will be pulled back by the engagement of the upside-down device instead of backward .

Beneficial effect

 According to the syringe of the present invention, the design of the inverted buckle device on the nipple of the pusher plunger and the corresponding inverted buckle device on the needle nipple on the lower end of the barrel makes the push rod cannot be pulled out of the barrel again after using the syringe Out. The design of the diameter reduction part of the breast protrusion makes someone want to repeatedly use the syringe and pull the push rod strongly. The engagement of the buckle device causes the breast protrusion to be pulled and breaks at the reduced diameter. The syringe was self-destructing, and it really achieved the purpose of single use. At the same time, because the buckle device is easy to be integrally processed with the pusher and the cylinder when producing the push rod and the cylinder. The process is simple and does not require additional costs. Low production costs. That is to say, it can achieve the real one-time use effect with simple process and lower production cost.

Brief Introduction

 FIG. 1 is a schematic view of a syringe according to a preferred embodiment of the present invention when it is not in use;

 FIG. 2 is a schematic diagram of a state of the syringe shown in FIG. 1 after use; FIG.

FIG. 3 shows that the upper end of the cylinder and the upper end of the push rod can be engaged with each other at corresponding positions. Another form of flip device;

Preferred embodiment

 As shown in FIG. 1, a syringe according to a preferred embodiment of the present invention includes a barrel body 1, a barrel core, and an injection needle. The core is a push rod 2 with a plurality of fins in section. The plunger 13 that pushes the medicinal solution 13 is connected with a nipple 6 corresponding to the needle nipple 5. In the embodiment shown in FIG. 1, an outer inverted buckle 3 is provided on the outer side of the nipple 6, and an inner inverted buckle 3 is provided on the inner side of the nipple 5 at a corresponding position. The inner buckle 4 is engaged with each other, so that after an injection task is completed, the push rod 2 cannot be pulled out of the cylinder 1 again due to the engagement of the buckle devices 3 and 4 with each other. At the same time, the breast projection 6 of the push rod piston 13 has a reduced diameter portion 10 between the outer inverse buckle 3 and the surface of the piston 13 pushing the medicinal solution. Under a certain external force, the breast projection 6 will break at the reduced diameter portion ^. The upper end of the blade of the pusher 2 is provided with outer buckles 8, 8, and the upper end of the cylinder 1 is provided at a corresponding position. When the push rod 2 is fully pushed into the cylinder 1, the outer buckle 8 can be engaged with each other The inner buckle 9 prevents the push rod 2 from being pulled out of the barrel 1 again, thereby achieving a double protection effect. In order to prevent some users from making the syringe reusable, the drug solution has not been completely injected, so that the breast projection 6 does not completely enter the needle nipple 5, so that the purpose of self-destructing or self-locking the syringe cannot be achieved, and the syringe can be reused. . For this reason, according to a preferred embodiment of the present invention, more than one outer kicks 8, 8 are provided on each wing of the push rod, and these outer kicks are at different distances from the finger pushing surface of the pusher. Among them, the outer buckle 8 closest to the pushing surface of the pusher finger, when the surface of the pusher piston 13 pushing the medicinal solution completely matches the bottom surface of the cylinder, that is, when the nipple 6 fully extends into the needle nipple 5, it is at the top of the cylinder The inner buckle 9 is engaged with each other. If the user 2 pushes the pestle into the cylinder 1 to a certain depth, that is, when a certain amount of medicinal solution remains in the cylinder, the push rod 2 is pulled outward, and the other outer buckles 8 on the wings of the push rod 2 will interact with the cylinder 1 The inner buckle 9 engages to prevent the pusher from pulling outward. This prevents the user from intentionally leaving a portion of the drug solution at the end of the injection to prevent the syringe from being self-locking or self-destructing in order to enable the syringe to be reused.

Fig. 2 shows the state of the syringe after the injection is completed. It can be seen from the figure that due to the action of the thrust force and the elastic effect of the extra buckle portion, the outer buckle 8 on the upper end of the push rod 2 and the inner downside of the cylinder The buckle 9 is fully engaged, while the inner buckle 4 of the nipple 5 and the The outer buckle 3 on the breast projection 6 is completely engaged. The engagement of the two parts of the buckle prevents the push rod 2 from being pulled out of the cylinder 1 again. When someone wants to reuse the syringe and pull the push rod 2 vigorously, due to the engagement between the nipple 6 and the needle nipple 5, and the engagement between the push rod 2 and the barrel 1, the Under a pulling force, the easily reduced diameter portion 10 on the mastoid 6 will break under the action of the pulling force, so that the mastoid 6 is blocked in the needle nipple 5, so that the syringe is self-destructing and cannot be used again. It can be seen from FIG. 1 that, in the preferred embodiment of the present invention, the bottom surface of the cylinder 1 and the surface of the pushing liquid of the plunger 13 of the push rod 2 are made into an inclined surface that cooperates with each other. The bottom surface of the cylinder 1 is different from the groove at the position of the needle nipple 5 to prevent the push rod from being pushed into the cylinder due to inadvertent rotation, so that the syringe locks itself without using. In use, after pulling the push rod 2 to suck the medicinal solution to a certain required dose, rotate it by a certain angle to align the marked line or marked point on the push rod 2 with the corresponding marked line 14 on the cylinder 1, so as to push the push rod After entering the cylinder 1, the nipple 6 is aligned with the inner hole of the needle nipple 5, and the air in the cylinder 1 is excluded for injection. After the injection is completed, the bottom surface of the cylinder is completely matched with the surface of the push rod piston 13 pushing the medicine solution. The design of the bottom surface as an inclined surface can promote the injection to be performed after the rotation is performed in order to achieve the prescribed injection dose, so that the final push rod 2 completely enters the cylinder 1, that is, the pushing liquid of the pusher piston 13 The surface is completely matched with the bottom surface of the cylinder 1.

An inverted buckle device capable of engaging the top end of the push rod 2 and the top end of the cylinder 1 with each other may also adopt other forms, as shown in FIG. 3. Each wing of pusher 2 has more than one protruding part with elastic buckle devices 11, 11, near the pushing surface of the finger. The flange of cylinder 1 has corresponding holes and can be extended with the pusher. Partial buckle devices 11, 11 and snapped buckle devices 12, after the marking line or marking point on the push rod 2 is aligned with the corresponding marking line 14 on the cylinder 1, with the push of the push rod 2 Into, the protruding part of its fins enters into the corresponding holes 12, 12, by means of the elastic energy of the buckle devices 11, 11 ,. When the surface of the push rod piston 13 pushing the medicinal solution completely matches the bottom surface of the cylinder 1, that is, when the breast projection 6 fully extends into the needle nipple 5, the shortest projection of the one or more projections is an inverted buckle The device 11 and the flip device 12 on the flange of the cylinder 1 are engaged with each other, so as to double prevent the push rod from being pulled out of the cylinder. If the user wants to make the syringe reusable, a certain amount of liquid remains in the barrel at the end of the first injection, and the syringe will not self-lock or self-destruct. When used outwards again When the push rod 2 is pulled, other buckle devices 11 on the wings of the push rod 2 will engage with the buckle device 12 of the cylinder 1, and the push rod 2 cannot be pulled out of the cylinder 1. This purpose of deliberately not injecting completely and reusing the syringe can no longer be achieved. The protruding portion with the buckle device on the wing can also be made with the same length, but multiple buckle devices can be achieved on each protruding portion, that is, the pusher 2 is self-extending The syringe barrel cannot be pulled outwards to a certain depth. Within the scope well known to those skilled in the art, various embodiments can be adopted, so that the barrel core 2 cannot be pulled back again after being pushed into the barrel 1 to a certain depth.

 In specific use, it can also be made into an overall packaging form, that is, the needle nipple 5 of the barrel 1 is closely fitted with an injection needle, and the external surface of the needle nipple or the barrel is provided with an external thread or an inverted buckle. There is only one rubber stopper for the special injection bottle connected with the internal thread or inverted connection sleeve, that is, there is a rubber stopper near the injection needle. The double injection bottle has three rubber stoppers, that is, the injection bottle near the needle tip of the injection needle has two rubber stoppers, and the injection bottle far from the needle tip has a rubber stopper. The two injection bottles are stacked on top of each other and connected by a plastic jacket. The syringe and injection bottle are made in the form of a whole package, which can save operation time, and only need to complete the aspiration of the liquid to perform the injection. Alternatively, a special medicine may be provided in the cylinder. The outer package of the product in which the syringe and injection bottle are assembled as a whole is printed with a brief description of the drug name, pharmacology, dosage, side effects, date of manufacture, and date of efficacy.

 Various modifications can be made to the invention without departing from the spirit and scope of the invention. For example, to prevent the syringe from locking up before being used, an anti-lock sleeve can be placed between the handle of the cartridge core and the barrel and removed during use. The reverse buckle device between the needle nipple 5 of the cylinder 1 and the breast projection 6 of the push rod 2 can adopt various forms that can be engaged with each other, which is well known to those skilled in the art.

Claims

 Rights request A disposable syringe comprising a barrel (1), a barrel core, and an injection needle, wherein the barrel core is a push rod (2) with a plurality of fins in a cross section, characterized in that the push rod piston (13) the surface of the pushing liquid is connected with a breast projection (6), and after the injection is completed, the breast projection (6) is completely matched with the inner hole of the needle nipple (5) of the barrel (1); the push rod piston (13) An inverted device (3) is provided on the outer side of the nipple (6) on the upper side of the breast, and an inverted device (3) is provided on the inner side of the needle nipple (5) at a corresponding position to be able to interact with the inverted portion (3) of the nipple (6) after injection. The engaged reverse buckle device (4) prevents the push rod (2) from being pulled out of the barrel (1) again; the breast protrusion (6) is in the pusher of the reverse buckle device (3) and the push rod piston (13) Between the surface of the liquid, there is a reduced diameter portion (10) that breaks the mastoid (6) under a certain tensile force. 2. The disposable syringe according to claim 1, wherein the flap of the push rod (2) has more than one buckle device (8, 8,), and the inner side of the upper end of the barrel (1) is connected with The buckle device (8, 8,) on the push rod (2) can be engaged with each other, and more than one buckle device (8, 8,) of the push rod (2) is separated from The finger pushing surfaces of the putter (2) are at different distances. 3. The disposable syringe according to claim 1, characterized in that the fin of the push rod (2) has more than one protruding part with an inverse buckle device (11, 11,), and the barrel (1) There are corresponding holes on the flange through which the protruding part can pass during the injection process, as well as the inverted buckles (11, 11 ') which can be engaged with each other on the protruding parts of the push rod (2). The buckle device (12), more than one of the protruding parts of the push rod (2) have different lengths, so that the push pestle (2) can't be pulled out again since it reaches a certain depth into the barrel (1). . The disposable syringe according to any one of claims 1 to 3, characterized in that the surface of the push rod piston (13) pushing the liquid and the bottom surface of the cylinder (1) are made into a mating inclined surface, and the syringe is in the initial position At the same time, the projection (6) on the plunger piston (13) and the cylinder (1) The bottom surface is different from the groove at the position of the needle nipple (5). The cylinder (1) has a marking line (14) indicating the injection position, and the pusher (2) has a marking line (14) during injection. Aligned mark points or lines. The disposable syringe according to any one of claims 1 to 3, characterized in that the needle nipple (5) of the barrel (1) is closely fitted with an injection needle, and the barrel or the needle nipple is assisted by a set of body and special The ampoule bottles are connected to form an integrated product of a syringe and an ampoule bottle. The ampoule bottle may be a single ampoule bottle or a double ampoule bottle stacked on top of each other. 6. The disposable syringe according to claim 5, wherein the two vial bottles stacked one above the other are connected and fixed to each other through a plastic sleeve. 7. The disposable syringe according to claim 5, characterized in that a brief description of the drug name, pharmacology, side effects, and factory name is printed on the outer package of the integrated product in which the syringe and the injection bottle are integrated.