CN2378059Y

CN2378059Y - Disposable syringe

Info

Publication number: CN2378059Y
Application number: CN 99212086
Authority: CN
Inventors: 郭伟士
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-21
Filing date: 1999-05-21
Publication date: 2000-05-17
Anticipated expiration: 2009-05-21

Abstract

The utility model relates to a disposable syringe. The utility model is characterized in that a cylinder core is a push rod 2 of which the cross section is provided with a plurality of fins; the medicine liquid pushing surface of a push rod piston 13 is connected with a mastoid 6, and the mastoid 6 is in perfect fit with the inner side of a needle papilla 5 at the lower end of a cylinder body 1 when an injection is finished. The mastoid 6 is provided with elastic outer reverse buckles 3, and the inner side of the needle papilla 5 is provided with corresponding inner reverse buckles 4 which are clamped with the outer reverse buckles 3 on the mastoid 6 when an injection is finished, and therefore, the push rod 2 can be prevented from being pulled out again. The mastoid 6 is provided with a diameter reducing part 10 between reverse buckle devices 3 and the medicine liquid pushing surface of the push rod piston 13, and when the push rod is pulled after an injection, the clamping action of the reverse buckle devices can lead the syringe to be self-locked; if the push rod is forcibly pulled, the mastoid 6 can be broken at the point of the diameter reducing part 10 because of tension, and the syringe is self-destroyed.

Description

Disposable syringe

This utility model belongs to the syringe of medical instruments field, is specifically related to a kind of disposable syringe.

Existing disposable syringe often can't guarantee that structurally user do not reuse it, so some user are reused this kind disposable syringe for the saving funds.Because existing this disposable syringe generally adopts the plastics manufacturing, non-refractory, can't utilize conventional high-temperature sterilization method to carry out disinfection, repeated use can cause the cross infection between the patient, particularly in the area of some comparatively remote areas and economics of underdevelopment, this type of situation happens occasionally, and causes very big harm.Be designed to after disposable use, make the disposable syringe of its self-destruction or self-locking, then can't promote the use of because its complex structure, production cost are high.

The purpose of this utility model be to provide a kind of simple in structure, cost is low, disposable syringe that can self-destruction after disposable use is really thus realized disposable purpose.

Disposable syringe of the present utility model, comprise cylindrical shell, tube core and entry needle, described tube core is the push rod that a plurality of fins are arranged, and it is protruding that the piston face of the promotion medicinal liquid of push rod bottom is connected with breast, when injection finished, the inboard of the needle nipple of breast protruding and cylindrical shell lower end cooperated fully.

The needle nipple of the newborn protruding and cylindrical shell on the push-rod piston is provided with the elasticity back-off device that can engage mutually in the corresponding position, when injecting, push rod does not cooperate fully with cylindrical shell, but separate slightly with cylindrical shell, make the protruding back-off device of push rod breast not engage with the back-off device of cylindrical shell needle nipple, push rod can move freely in cylindrical shell; After aspiration medicinal liquid, injection finished, push rod entered in the cylindrical shell fully, and the newborn protruding and needle nipple of cylindrical shell on the push rod cooperates fully.

Back-off device on breast is protruding engages mutually with the back-off device on the needle nipple, stop push rod to be pulled out once more, protruding the going up of breast has a diameter to dwindle part between back-off device and push rod bottom surface, and under certain pulling force effect, newborn protruding meeting is disconnected from this diameter diminution part office to be two parts.When the needle nipple of the newborn protruding and cylindrical shell on the push rod cooperates fully, as want to overcome the effect of back-off device, outwards spur push rod energetically, the then newborn protruding snap action that is subjected to back-off device, disconnect from reduced, be blocked in the needle nipple, reach the purpose that makes self-destruction after the disposable use of entry needle.

For making disposable syringe of the present utility model reach the purpose of duplicate protection; the push rod top is provided with the back-off device that can engage mutually with cylinder top in the corresponding position; when the end face of push-rod piston promotion medicinal liquid and cylindrical shell bottom surface cooperatively interact; back-off device on the push rod top engages mutually with back-off device on the cylinder top, reaches the effect of duplicate protection.

For preventing that the someone from wanting to reuse injection needles, and the premeditated cylindrical shell that push rod do not pushed fully, promptly, when finishing, injection still leaves a part of medicinal liquid in the cylindrical shell, syringe still can be used for injecting next time, and this utility model is designed to the vertical back-off device of push rod has different distances apart from the push rod top, makes push rod after pushing the interior part distance of cylindrical shell, pull back the snap action that will be subjected to back-off device, and can not retreat.

Syringe of the present utility model, the design of the back-off device that can engage with each other accordingly on back-off device on push-rod piston newborn protruding and the cylindrical shell lower end needle nipple, make this syringe use rear push-rod in cylindrical shell, not pull out once more, the protruding design of going up the reduced part of breast, making has the people to want to reuse syringe and when spurring push rod energetically, the engaging of back-off device makes breast be subjected to pulling force on protruding, and rupture at the reduced place, the syringe self-destruction, really reach disposable purpose, simultaneously owing to back-off device is easy to when producing push rod and cylindrical shell, with push rod and the machine-shaping of cylindrical shell one, technology is simple, and need not increases extra cost, and producing cost is low.That is to say can be with simple technology, and lower production cost reaches real disposable effect.

Below in conjunction with accompanying drawing syringe of the present utility model is described further:

Fig. 1 is the structural representation of syringe of the present utility model when unused state;

Fig. 2 is the status architecture sketch map of syringe after using shown in Figure 1;

Fig. 3 illustrates the cylindrical shell upper end and the structural representation of push rod upper end at the back-off device that can engage with each other of corresponding position setting of this utility model syringe;

As shown in Figure 1, syringe of the present utility model comprises cylindrical shell 1, tube core and entry needle, and wherein the tube core is the push rod 2 that there are a plurality of fins in the cross section, and the piston 13 that push rod 2 promotes medicinal liquid is connected with and needle nipple 5 corresponding breasts protruding 6.Protruding 6 outsides of breast are provided with outer back-off 3, needle nipple 5 inboards back-off 4 in the relevant position is provided with, and after breast protruding 6 entered needle nipple 5 fully, back-off 4 can engage mutually with the outer back-off 3 on breast is protruding in this.Like this, after shot task is finished, because engaging with each other of inside and outside back-off 3,4 makes this push rod 2 can not pull out cylindrical shell 1 once more.Simultaneously newborn protruding 6 of push-rod piston 13 have a diameter to dwindle part 10 between the surface of back-off 3 and piston 13 promotion medicinal liquids outside, and under external force effect necessarily, described breast protruding 6 can rupture at these reduced part 10 places.The fin upper end of push rod 2 is provided with outer back-off 8,8 '; the upper end of cylindrical shell 1 is provided with when push rod 2 pushes cylindrical shell 1 fully the interior back-offs 9 that can engage mutually with outer back-off 8 in corresponding position; push rod 2 can not be pulled out from cylindrical shell 1 once more, thereby reach the effect of duplicate protection.For preventing that some user is for syringe can be reused, medicinal liquid is not all injected to finish, breast protruding 6 is not exclusively entered in the needle nipple 5, thereby do not reach the purpose of self-destruction or self-locking syringe, syringe can be reused, syringe of the present utility model, back-off 8 outside can being provided with more than one at the finger push face different distance place apart from push rod of each fin of push rod, 8 ', in these outer back-offs from the nearest outer back-off 8 of push rod finger push face, when cooperating fully with the cylindrical shell bottom surface, promptly on the surface that push-rod piston 13 promotes medicinal liquids, when breast protruding 6 stretches into needle nipple 5 fully, engage mutually with cylindrical shell 1 vertical interior back-off 9.If user is certain depth in push rod 2 enters cylindrical shell 1, be in the cylindrical shell during still residual certain medicinal liquid, outwards spur push rod 2, the outer back-off 8 of on push rod 2 fins other, can engage with the interior back-off 9 of cylindrical shell 1, anti-throw-out lever is pulled outwardly moving, thereby prevents that user from can reuse for making syringe, and intentional residual a part of medicinal liquid makes not self-locking of syringe or self-destruction when injection finishes.

Fig. 2 illustrates the state of syringe after injection finishes, from the figure as can be seen, because the effect of thrust, the elastic reaction of back-off part outside adding, make the outer back-off 8 of push rod 2 upper ends engage fully with the interior back-off 9 of cylindrical shell upper end, simultaneously the interior back-off 4 of needle nipple 5 engages fully with outer back-off 3 on newborn protruding 6, and the snap action of this two parts back-off makes push rod 2 not pull out once more from cylindrical shell 1.When the people wants to reuse syringe and spurs push rod 2 energetically, since the breast protruding 6 with needle nipple 5 between engage, and engaging between push rod 2 and the cylindrical shell 1, and on breast protruding 6, apply a pulling force, reduced part 10 easily broken on the breast protruding 6 can rupture under the pulling force effect, breast protruding 6 is blocked in the needle nipple 5, and syringe self-destruction like this can't reuse.

In conjunction with Fig. 1 as can be seen, in the syringe of the present utility model, the inclined-plane that cooperatively interacts is made on the surface of the promotion medicinal liquid of cylindrical shell 1 bottom surface and push rod 2 pistons 13, when initial position, breast protruding 6 be located at the groove fit that cylindrical shell 1 bottom surface is different from needle nipple 5 positions, anti-throw-out lever makes syringe without using with regard to self-locking owing to casual rotation pushes cylindrical shell.During use, pulling push rod 2 aspiration medicinal liquids are to required dosage, rotate to an angle, mark line or gauge point on the push rod 2 are aimed at the respective markers line 14 on the cylindrical shell 1, promote push rod 2 like this and enter after the cylindrical shell 1, breast protruding 6 is aimed at needle nipple 5 endoporus, and eliminating cylindrical shell 1 interior air is injected, after injection finished, the cylindrical shell bottom surface cooperated fully with the surface that push-rod piston 13 promotes medicinal liquid.Thisly the bottom surface is designed to the inclined-plane can impels to reaching the injected dose of regulation, and inject again after must being carried out in accordance with regulations rotation, so that final push rod 2 enters in the cylindrical shell 1 fully, that is, the surface of the promotion medicinal liquid of push-rod piston 13 cooperates fully with the bottom surface of cylindrical shell 1.

As shown in Figure 3, other form also can be adopted with the back-off device that cylindrical shell 1 top can engage mutually in push rod 2 tops: push rod 2 each fin have the more than one elasticity back-off device 11 that has near finger push face place, 11 ' extension, have on the flange of cylindrical shell 1 corresponding perforations and accordingly can with the back-off device 11 on the push rod extension, the back-off device 12 of 11 ' engaging, mark line on push rod 2 or gauge point are with after the respective markers line 14 on the cylindrical shell 1 is aimed at, along with pushing of push rod 2, extension on its fin is by back-off device 11, and 11 ' elastic energy enters corresponding perforations 12, in 12 '.When the surface of the promotion medicinal liquid of push-rod piston 13 cooperates fully with cylindrical shell 1 bottom surface, promptly, when breast protruding 6 stretches into needle nipple 5 fully, in the described above projection, the back-off device 11 of the projection that length is the shortest engages mutually with back-off device 12 on cylindrical shell 1 flange, thereby dual anti-throw-out lever is pulled out in cylindrical shell.If user is for syringe can be reused, when for the first time injection finishes in cylindrical shell still residual certain medicinal liquid, syringe can self-locking or self-destruction, when reusing outside pulling push rod 2, other back-off device 11 ' on push rod 2 fins can engage with the back-off device 12 of cylindrical shell 1, and push rod 2 can not be pulled out in cylindrical shell 1.This premeditated purpose that reuses syringe fully of not injecting no longer can realize.The extension of the band back-off device on the described fin also can be made same length, but stretching at each has a plurality of back-off devices also can achieve the above object on the projection, promptly, push rod 2 certain depth in injector cartridge is gone in the Shen just can not outwards spur again, in scope well-known to those skilled in the art, can take various embodiments, make tube core 2 certain depth in pushing cylindrical shell 1 just to retract once more.

When concrete the use, also can make a kind of like this entire package form, that is, entry needle has closely cooperated on the needle nipple 5 of cylindrical shell 1, needle nipple or barrel outer surface are provided with external screw thread or back-off, have the adapter sleeve of corresponding female thread or back-off to be connected with special-purpose injection bottle by one.Described injection bottle can adopt the single injection bottle or the form of double-deck injection bottle up and down, and single injection bottle has only a rubber stopper, promptly near the entry needle place rubber stopper is arranged.Described pair of injection bottle has three rubber stoppers, promptly the injection bottle near the entry needle needle point has two rubber stoppers, injection bottle away from needle point has a rubber stopper, described two injection bottles are stacked mutually, by a plastic wrapper both are linked to each other, this syringe and injection bottle are made the form of entire package, can save the operating time, only need finish aspiration medicinal liquid and can inject.Perhaps also can in cylindrical shell, be furnished with special agent.Be printed in the outer package of this syringe and injection bottle overall package product together: nomenclature of drug, pharmacology, dosage, side effect, date of manufacture, brief descriptions such as drug effect date.

Under the prerequisite that does not exceed this utility model essence and scope, can make all distortion to this utility model.For example, just locked before not using for avoiding syringe, between the handle of tube core and cylindrical shell, the anti-locking cover can be set, be removed during use.The needle nipple 5 of cylindrical shell 1 and push rod 2 newborn protruding 6 between back-off device can adopt the various forms that can engage with each other, this knows to those skilled in the art.

Claims

1. disposable syringe, comprise cylindrical shell (1), tube core and entry needle, described tube core is the push rod (2) that there are a plurality of fins in the cross section, the surface that it is characterized in that push-rod piston (13) the promotion medicinal liquid of push rod (2) is connected with breast protruding (6), breast protruding (6) is finished with the endoporus of the needle nipple (5) of cylindrical shell (1) and is cooperated after injection finishes, the outside of newborn protruding (6) of push-rod piston (13) is provided with back-off device (3), the inboard of needle nipple (5) be provided with in the relevant position after injection finishes can protruding with breast (6) back-off device (3) engage mutually, thereby anti-throw-out lever (2) is pulled out the back-off device (4) of cylindrical shell (1) once more; Described breast protruding (6) is having a reduced part (10) that under certain pulling force effect breast protruding (6) is disconnected between the surface of the promotion medicinal liquid of its back-off device (3) and push-rod piston (13).

2. disposable syringe as claimed in claim 1, the finger push face different distance place apart from push rod (2) that it is characterized in that each fin of described push rod (2) is provided with more than a back-off device (8,8 '), inboard, cylindrical shell (1) upper end have with above-mentioned push rod (2) on back-off device (8, the 8 ') back-off device (9) that can engage mutually.

3. disposable syringe as claimed in claim 1, it is characterized in that having more than one on the fin of push rod (2) and have back-off device (11, the extension of different length 11 '), the corresponding hole that extension can pass when injection process is arranged on the flange of cylindrical shell (1), and can with back-off device (11,11 ') on each extension of described push rod (2) back-off device (12) of engaging mutually.

4. as claim 1,2 or 3 described disposable syringes, it is characterized in that push-rod piston (13) promotes the surface of liquid and the inclined-plane that cooperatively interacts is made in the bottom surface of cylindrical shell (1), syringe is when initial position, the groove fit that is different from needle nipple (5) position on newborn protruding (6) on the push-rod piston (13) and cylindrical shell (1) bottom surface, the mark line (14) that shows injection position is arranged on the cylindrical shell (1), when injection and aligned gauge point of described mark line (14) or mark line are arranged on the push rod (2).

5. as claim 1,2 or 3 described disposable syringes, it is characterized in that the entry needle that closely cooperated on the needle nipple (5) of cylindrical shell (1), cylindrical shell or needle nipple are connected with special-purpose injection bottle by a body, form the integral product of syringe and injection bottle unification, described injection bottle adopts single injection bottle or stacked up and down two injection bottles.

6. disposable syringe as claimed in claim 5 is characterized in that, described stacked two injection bottles up and down interconnect by a plastic sheath and are fixed together.

7. disposable syringe as claimed in claim 5 is characterized in that being printed on brief descriptions such as nomenclature of drug, pharmacology, side effect and factory's name in the outer package of the integral product of syringe and injection bottle unification.