CN2724733Y

CN2724733Y - Back-drawing type safety syringe

Info

Publication number: CN2724733Y
Application number: CN 200420092408
Authority: CN
Inventors: 史昭华
Original assignee: Hengwang Biochemical Science & Technology Co Ltd
Current assignee: Hengwang Biochemical Science & Technology Co Ltd
Priority date: 2004-09-15
Filing date: 2004-09-15
Publication date: 2005-09-14
Anticipated expiration: 2014-09-15

Abstract

The utility model relates to a back-drawing type safety injector, comprising a needle, a syringe and a plunger. Wherein, the bottom of the needle is provided with a first engagement portion, a needle socket is formed on the syringe, and the injection space is formed under the syringe. The needle is combined with the needle socket through predetermined binding force. The plunger can be pushed into the injection space in the syringe from the direction under the syringe. Wherein, the piston adopts the elasticity material and has hollow containing space. The piston is made into a shape which is easy to be compressed under stress and returns. So the piston is pushed upwards in the injection space of the syringe until the top face of the piston contacts the top of the inner wall of the injection space and the first engagement portion is not combined with the second engagement portion in the condition. When force is applied above the default value, the piston is compressed to deform to a certain extent. When the second engagement portion protrudes upwards and is far away from the top face of the piston, the second engagement portion starts combining with the first engagement portion. So the needle can break away from the needle socket and is pulled back to the interior of the syringe.

Description

Haulback safety syringe

Technical field

This utility model relates to a kind of safety injector of syringe needle to syringe inside of pulling back, particularly a kind of safety injector that is provided with force-applied compression and answer, rubber-like piston, this telescopic elastic piston can be pushed to contact syringe injection space top inwall, and in the time of can after injection, pulling back syringe needle, help syringe needle to break away from the fixed position, the bonded action of this syringe needle and plunger can be finished outside patient, can not increase the misery of sufferer, be applicable to the structure of various haulback safety syringes.

Background technology

Syringe or syringe that present subcutaneous injection is used have been widely used in medical field, usually syringe for once use, with after promptly lose, not only convenient and healthy but also can avoid disease to infect by syringe needle, accidentally just medical personnel be may stab yet depleted syringe is exposed to outer syringe needle, wound or communicate illness produced; If discarded syringe is not dealt carefully with, arbitrarily to throw aside in environment, sharp-pointed syringe needle also can be stabbed other people; For the environmental protection personnel that handle Biohazard Waste, also may be being injured of discarded syringe needle, the generation of haulback safety syringe is hereat arranged then, can syringe needle be hidden in the syringe with using syringe needle later to be returned in the syringe, and reduce the volume of syringe.

Traditional haulback safety syringe as shown in figure 11, one syringe A front end forms a syringe needle socket A1, this syringe needle socket A1 can fix for a syringe needle B, this syringe needle B comprises the needle stand B1 that a bottom is provided with the first convergence part B2, and a plunger C who comprises push rod C1 and piston C2 can be pushed by the rear of syringe A, this piston C2 end face is provided with one second convergence part C3, for avoiding the first convergence part B2 before syringe uses, not combine unintentionally with the second convergence part C3, usually can reserve a space d between the two, and in the latter end process of medicament injection, need again with push rod C1 before the strength, the first convergence part B2 is combined with the second convergence part C3, so during push rod C1 post-tensioning, the syringe needle B that has needle body can be drawn in the syringe A, can safely syringe be abandoned.The pull back needle body automatic retracting type safety injector of mechanism and active device of default spring is also arranged on the market, after injection finishes, force in active device, its syringe needle can be returned in the syringe by the default spring mechanism that pulls back; Yet for combining unintentionally before avoiding push rod and syringe needle using, still leave a space between this injector push-rod front end and syringe needle before the injection, cause the extraction of medicament to have a margin of error.Therefore above-mentioned syringe still has following shortcoming:

1, traditional syringe is before using, and the inboard end face of its piston-top surface and syringe is reserved a gap, is not intended to combination before use to avoid two convergence parts, yet this gap but causes medical personnel's extraction amount when extracting medicament inaccurate.

2, no matter commonly use the syringe of manual haulback type or automatic haulback type, in the latter end process of injection, for piston being shifted onto the end medicament is released fully, and overcome to reach and be connected bonded resistance or for activating the syringe needle mechanism that pulls back automatically, need apply a suitable strength in push rod, this strength will cause the pain of sufferer.

Summary of the invention

Main purpose of the present utility model is providing a kind of haulback safety syringe that is provided with force-applied compression and answer, rubber-like piston, can help or the syringe needle of semi-automatically pulling back to syringe inside, easy and simple to handle, use laborsavingly, and be fit to be used in the automatic haulback type syringe of the default mechanism that pulls back.

Of the present utility model time a purpose can allow piston-top surface shift the haulback safety syringe that the end touches top, needle cylinder injection space inwall onto when a kind of the injection is provided, and the mechanism that pulls back of un-activation still, so that the injector before using accurately the zero graduation from syringe begin to draw medicament, reach good pharmaceutical quantities control.

A purpose more of the present utility model is providing a kind of piston can be pushed into contact syringe injection space top inwall, the interface components above needle stand and piston as yet not in conjunction with the time, medicament can be injected away fully; Making can be after extracting needle body, again in by the external application of force of injector, with plunger in the syringe cylinder and the bonded haulback safety syringe of syringe needle, to avoid pulling back the action increase by injector's pain sense.

Above-mentioned purpose of the present utility model is to realize like this, a kind of haulback safety syringe includes a syringe needle, a syringe and a plunger, wherein this syringe needle bottom is provided with one first convergence part, the syringe top forms a syringe needle socket, and the below then is an injection space, and syringe needle is incorporated on the syringe needle socket with a predetermined adhesion, this plunger can be by the injection space that advances below the syringe in syringe, wherein this piston is an elastic material, have between hollow appearance, and for being subjected to force compresses and regressive shape easily.

By this, piston is pushed upwardly in the injection space of syringe, inwall top until piston-top surface contact injection space, and first convergence part is not combined as yet in this situation with second convergence part, and, can make piston crimp to a certain degree, and second convergence part is projected upwards with away from the end face of piston the time when applying a strength to default value when above, second convergence part beginning combines with first convergence part, is drawn back into syringe inside person and make syringe needle can break away from the syringe needle socket.

In addition, this utility model provides several specific embodiments, disclose the different shape and the structure of enforceable piston, make the restoring force of this piston resilience by compression easily can overcome the fixing and bonding force of syringe needle and syringe, for second convergence part of piston nose, also provide several enforceable examples again.

For the ease of more deep understanding being arranged, this utility model is elaborated below by instantiation to this utility model.

Description of drawings

Fig. 1 is the schematic perspective view of the haulback safety syringe of this utility model embodiment;

Fig. 2 is the generalized section of the haulback safety syringe of this utility model embodiment;

Fig. 2 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 2;

Fig. 2 B is that the piston-top surface of this utility model haulback safety syringe contacts the still undeformed local enlarged diagram of piston with the spatial inwall of needle cylinder injection top;

Fig. 3 is the bonded generalized section in first convergence part and second convergence part of the haulback safety syringe of this utility model embodiment;

Fig. 3 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 3;

Fig. 4 is that the syringe needle of the haulback safety syringe of this utility model embodiment is drawn in the generalized section in the injector syringe;

Fig. 5 is the generalized section of the piston that is stacked into of the discoid elastomer of the haulback safety syringe of this utility model embodiment;

Fig. 5 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 5;

Fig. 6 is the generalized section of piston of middle constriction of the haulback safety syringe of this utility model embodiment;

Fig. 6 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 6;

Fig. 7 is the generalized section of surperficial helicoid piston of the haulback safety syringe of this utility model embodiment;

Fig. 7 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 7;

Fig. 8 is the generalized section that the hook portion front end of the haulback safety syringe of this utility model embodiment partly protrudes in piston-top surface;

Fig. 8 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 8;

Fig. 9 is the generalized section that the hook portion of the haulback safety syringe of this utility model embodiment is placed in internal piston fully;

Fig. 9 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 9;

Figure 10 is that the needle body of haulback safety syringe of this utility model embodiment and needle stand are to rotate the generalized section of bonded compound mode;

Figure 10 A is the local amplification profile sketch map of the haulback safety syringe of Figure 10;

Figure 11 is the generalized section of traditional haulback safety syringe.

Description of reference numerals: 40 syringe needles; 41 needle bodies; 42 needle stands; 43 sour jujubes (first convergence part) of pulling; 44 adaptors; 50 syringes; 51 syringe needle sockets; 52 injection space; The inwall top of 521 injection space; 60 plungers; 61,61a, 61b, 61c piston; 62 push rods; 63 piston boits; 64 hook portions (second convergence part); 65 spring assemblies; 611 piston-top surfaces; Between 612 hollows are held.

The specific embodiment

See also Fig. 1, Fig. 2 and Fig. 2 A, haulback safety syringe of the present utility model comprises a syringe needle 40, one syringe 50 and a plunger 60, wherein this syringe needle 40 includes a needle body 41 and at least for needle body 41 fixed needle stands 42, one first convergence part (sour jujube of pulling) 43 is established in these needle stand 42 bottoms, first convergence part that is made of at least one sour jujube 43 of pulling is an embodiment of convergence part, these sour jujube 43 1 ends of pulling are fixedly arranged on needle stand 42 bottom inside walls, one end is unsettled to be barb-like that opening dwindles towards the top, the pull central part hollow of sour jujube 43, be communicated with needle stand 42 and needle body 41, form the medicament passage.

Plunger 60 can be advanced the injection space 52 of syringe 50 by the below of syringe 50, one shaft-like push rod 62 is located at this plunger 60 belows, plunger 60 front end central authorities establish a piston boit 63, one scalable rubber-like piston 61 is sheathed on this piston boit 63, this piston 61 is elastic materials, have a hollow hold between 612, and be set as and be subjected to force compresses and regressive shape easily, piston boit 63 tops formation one protrudes in second convergence part 64 of piston 61 end faces, one embodiment of this second convergence part is cone shape hook portion 64, and the bottom of this hook portion 64 contacts with piston 61 end faces.

Shown in Fig. 1, Fig. 2 and Fig. 2 A, one embodiment of this piston 61 is formed by the elastomer storehouse of two opposed circular cone shapes, elastomeric circumferential edges and syringe 50 inwalls fit tightly, when doctor or nurse will extract medicament, piston-top surface 611 can be pushed to the inwall top 521 of contact syringe injection space, this moment, first convergence part 43 did not combine (please join Fig. 2 B) as yet with second convergence part 64, so can begin to draw medicament from the zero graduation of syringe.When injection medicament, push push rod 62 the inwall top 521 of injection space to forward, contact with the inwall top 521 of injection space up to piston-top surface 611, medicament all is pushed out outside the syringe 50, and this moment, first convergence part 43 did not combine as yet with second convergence part 64.After so injection is finished, injection needle 40 can be shifted out external by the injector, again with a strength with push rod 62 forward impelling, make the distortion that also is squeezed of the piston 61 of elastic compression, first convergence part 43 combines with second convergence part 64 simultaneously, shown in Fig. 3 and Fig. 3 A, after discharging strength, the restoring force of piston 61 can help to overcome the strength that combines of syringe needle 40 and syringe needle socket 51, therefore this restoring force will help syringe needle 40 to pull back toward syringe 50 inside, this moment, the injector was as long as pull out push rod 62 gently backward, can semi-automatically syringe needle 40 be pulled back and make in the injection space 52 that is hidden in syringe 50 fully, as shown in Figure 4, depleted syringe needle is not exposed to outside the syringe, reach the effect of safety syringe-drum.

The structural configuration of piston also can be designed to the piston 61a by at least two discoid elastomer storehouses except Fig. 1 is represented, shown in Fig. 5 and Fig. 5 A; Also can be designed to the elastomeric piston 61b of column of constriction in the middle of, shown in Fig. 6 and Fig. 6 A; Or be designed to the piston 61c of surface for the column of screw thread, shown in Fig. 7 and Fig. 7 A; Certainly the piston form that constituted of other similar column or other body, as long as but have piston be compressed after the character of resilience, the restoring force of this piston can overcome the bed knife of syringe needle and syringe needle socket, all should be considered as not breaking away from the category of this utility model spirit.

In addition, except that aforesaid hook portion 64 for to protrude in the design of piston 61 end faces, also can cooperate the demand of making or using and the setting of diverse location is arranged, push rod 62 before all can reaching and make the purpose of the hook portion 64 and first convergence part 43, as Fig. 8, shown in Figure 9, these hook portion 64 front ends partly protrude in piston 61 end faces, between all the other hollows that partly then are placed in piston 61 inside of hook portion 64 are held in 612, or this hook portion 64 hollow of being placed in piston 61 inside fully hold between in 612 (promptly being coated) by piston, make after applying a strength and making piston crimp, hook portion 64 can upwards pass piston and away from the end face of piston, and combines with first convergence part 43.So no matter the position of hook portion 64 is for being exposed to piston 61 outer (as shown in Figure 2) fully, partly being exposed to piston 61 outer (shown in Fig. 8 A) or be coated on piston interior (shown in Fig. 9 A) fully, in case after applying a strength and making piston crimp, hook portion 64 all can upwards pass piston 61 and away from the end face of piston 61, and combines smoothly with first convergence part 43.

During enforcement, compressible and regressive elastic piston device of the present utility model, also be applicable to and be preset with the pull back automatic haulback type safety syringe-drum (not being shown among the figure) of mechanism and active device of syringe needle, its effect is as follows: the injection space that is pushed into syringe when piston, when piston-top surface contacts with the inboard end face of injection space, the active device un-activation still mechanism that pulls back, need apply a strength and make piston crimp, the device that triggers the activation begins, make the mechanism action of pulling back, and make syringe needle be returned to syringe inside by default restoring force.

In addition, the possible embodiment of first convergence part of the present utility model and the second convergence part structural design can be and variously works in coordination, combinable shape and size, even the shape of the two is also interchangeable with effect, can reach the linking effect equally, all fields for this reason those of ordinary skill can local correction or variation, but all should be considered as the practical range of haulback safety syringe of the present utility model first convergence part and second convergence part.

See also Figure 10 again, syringe needle 41 of the present utility model also can comprise an adaptor 44 (Adapter), mat adaptor 44 is incorporated into syringe 50 tops,

needle body

41 and 42 inside that are incorporated into adaptor 44 of needle stand, and needle body 41 removably is incorporated on the adaptor 44 with needle stand 42, first convergence part 43 then is formed at the bottom of adaptor 44, therefore, drawing between liquid medicine and the injection, replaceable needle body 41, make needle body 41 and needle stand 42 ' the rotatable combination (Lure Lock), or make needle body 41 ' and needle stand 42 ' directly chimeric (LureSlip), Figure 10 only is the rotatable bonded embodiment of needle body and needle stand, and other difformity all can be applicable to semi-automatic haulback type safety syringe-drum of the present utility model with the syringe needle and the needle body of different combinations.

The structure that the utility model discloses can be applicable to the various pulling type syringes of medical field, has the following advantages:

1, the restoring force of the stressed resilience of piston of haulback safety syringe of the present utility model can overcome syringe needle With the adhesion of syringe, make the operator of injection needle tube can be semi-automatic effortlessly with injection needle toward syringe Inside retracts.

2, haulback safety syringe of the present utility model is suitable for after parenteral solution is all released syringe, with pin Head is extracted outside the patient, again plunger and syringe needle is given combination, and the linking action of avoiding pulling back is executed in addition The strength that adds causes the pain of sufferer or uncomfortable.

3, want to make syringe needle to be combined with plunger and must apply a suitable strength, before the design of this strength can be avoided using Or improperly combination in the transportation, cause the inefficacy of syringe.

4, before haulback safety syringe of the present utility model was not yet injected, piston-top surface can be shifted the end onto and touch Inwall top to the needle cylinder injection space makes syringe in sufficient exhaust, or carves from zero of syringe accurately Degree begins to draw medicament, reaches good pharmaceutical quantities control.

In sum, the utility model really can accomplish the end in view, and a kind of haulback safety syringe is provided, It is simple, easy to use that it forms member, has the value that industry is utilized.

Claims

1, a kind of haulback safety syringe is characterized in that comprising:

One syringe needle comprises needle body and needle stand at least, and needle body is fixed on the needle stand, and the bottom of syringe needle is provided with one first convergence part;

One syringe, its top forms a syringe needle socket, and the below is an injection space, and syringe needle is incorporated on the syringe needle socket with a predetermined adhesion; And

One plunger, can by syringe below advance injection space in syringe, the front end of plunger be provided with one can with bonded second convergence part, first convergence part and a piston, wherein this piston is an elastic material, have between hollow appearance, and for can be subjected to force compresses and regressive shape easily;

Wherein, piston is pushed upwardly in the injection space of syringe, inwall top until piston-top surface contact injection space, and first convergence part is not combined as yet in this situation with second convergence part, and, can make piston crimp to a certain degree, and second convergence part is projected upwards with away from the end face of piston the time when applying a strength to default value when above, second convergence part beginning combines with first convergence part, is drawn back into syringe inside and make syringe needle can break away from the syringe needle socket.

2, haulback safety syringe as claimed in claim 1 is characterized in that, first convergence part of syringe needle is at least one sour jujube of pulling of being located at the bottom, and second convergence part of plunger is one to protrude in the hook portion of piston-top surface, and the bottom of this hook portion contacts with piston-top surface.

3, haulback safety syringe as claimed in claim 1, it is characterized in that, first convergence part of syringe needle is at least one sour jujube of pulling of being located at the bottom, and second convergence part of plunger is the hook portion that a front end partly protrudes in piston-top surface, and all the other partly are placed in the inside of piston this hook portion.

4, haulback safety syringe as claimed in claim 1, it is characterized in that, first convergence part of syringe needle is at least one sour jujube of pulling of being located at the bottom, and second convergence part of plunger is a hook portion, in between the hollow that this hook portion is placed in internal piston is held, when applying a strength to default value when above, hook portion upwards passes piston and leaves the end face of piston, and combines with first convergence part.

5, haulback safety syringe as claimed in claim 1 is characterized in that, is piston-shapedly formed by the two opposed frustums of a cone.

6, haulback safety syringe as claimed in claim 1 is characterized in that, piston-shaped is to be formed by at least two discoid institute storehouses.

7, haulback safety syringe as claimed in claim 1 is characterized in that, piston-shaped is the cylindric of a middle constriction.

8, haulback safety syringe as claimed in claim 1 is characterized in that, piston-shaped is that a surface is the cylindric of spiral.

9, haulback safety syringe as claimed in claim 1, it is characterized in that, syringe needle also comprises an adaptor, be incorporated into the syringe top by this adaptor, needle body and needle stand are incorporated into the inside of adaptor, and needle body and needle stand removably are incorporated on the adaptor, and first convergence part is formed at the bottom of adaptor.