CN2684846Y - Back pulling safety syringe - Google Patents
Back pulling safety syringe Download PDFInfo
- Publication number
- CN2684846Y CN2684846Y CN 200320104347 CN200320104347U CN2684846Y CN 2684846 Y CN2684846 Y CN 2684846Y CN 200320104347 CN200320104347 CN 200320104347 CN 200320104347 U CN200320104347 U CN 200320104347U CN 2684846 Y CN2684846 Y CN 2684846Y
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- CN
- China
- Prior art keywords
- syringe
- piston
- needle
- plunger
- syringe needle
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a back pulling safety injector, comprising a needle, a syringe and a plunger. Wherein, the bottom of the needle is provided with a first engagement portion, and the front end of the plunger is provided with a telescopic piston with elasticity. A second engagement portion which can be combined with the first engagement portion is arranged on the upper end of the piston. The telescopic piston with elasticity can be pushed to the inner wall of the top end which can contact with the injection space of the syringe. When force is applied to make the first engagement portion combined with the second engagement portion, the restoring force can be used to help the needle overcome the binding force fixed by the needle base. The back pulling safety syringe has a plurality of shapes and constructions of the piston which are suitable for enforcement, and can be used in various back pulling injectors.
Description
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 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 the victim 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.
Known haulback safety syringe as shown in figure 10, 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, when injection finish after, 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.In addition,, avoid using that push rod combines with the improper of syringe needle in preceding or the transportation, will cause the inefficacy of syringe if safety injector does not have one to stop mechanism.Therefore above-mentioned syringe still has following shortcoming:
1, known 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 provides 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.
An of the present utility model purpose provides a kind of piston-top surface that allows and shifts the haulback safety syringe that the end touches top, needle cylinder injection space inwall onto, can make the injector before using fully with the syringe aerofluxus, and the zero graduation from syringe begins to draw medicament accurately, reaches good pharmaceutical quantities control.
A purpose more of the present utility model provides 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.
For reaching above-mentioned utility model purpose, the designed haulback safety syringe of this utility model includes a syringe needle, a syringe and a plunger, and wherein this syringe needle comprises a needle body and for the fixed needle stand of needle body, and this needle stand 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 to be incorporated on the syringe needle socket with a predetermined adhesion.Plunger can be by the injection space in the syringe below propelling syringe, the front end of plunger is provided with a force-applied compression and answer, rubber-like piston, the upper end of piston be provided with one can with bonded second convergence part, first convergence part, be pushed into the injection space of syringe when piston, when piston-top surface contacts with the inboard end face of injection space, first convergence part does not combine as yet with second convergence part, make piston crimp when applying a strength, begin to make first convergence part to combine, be drawn back into syringe inside and make syringe needle break away from the syringe needle socket with second convergence part.
This utility model provides four specific embodiments again, discloses the different shape and the structure of enforceable piston, makes the restoring force of this piston resilience by compression can overcome the fixing and bonding force of syringe needle and syringe.
For ease of more deep understanding being arranged, with instantiation this utility model is elaborated below in conjunction with accompanying drawing 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 of the piston that is provided with spring assembly of the haulback safety syringe of this utility model embodiment;
Fig. 8 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 8 figure;
Fig. 9 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;
Fig. 9 A is the local amplification profile sketch map of the haulback safety syringe of Fig. 9;
Figure 10 is the generalized section of known haulback safety syringe.
Description of reference numerals: 40: syringe needle; 41,41 ': needle body; 42,42 ': needle stand; 43: the sour jujube of pulling (first convergence part); 50: syringe; 51: the syringe needle socket; 52: injection space; 60: plunger; 61,61a, 61b, 61c: piston; 62: push rod; 63: piston boit; 64: hook portion (second convergence part); 65: spring assembly; 611: piston-top surface; 521: the inwall top of injection space.
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 for needle body 41 fixed needle stands 42, one first convergence part 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 channel.
Shown in Fig. 1, Fig. 2 and Fig. 2 A, one embodiment of this piston 61 is that the elastomer storehouse of two opposed circular cone shapes forms, 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 except Fig. 1 represented, also can be designed to piston 61a, shown in Fig. 5 and Fig. 5 A by at least two discoid elastomer storehouses; 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; And in order to strengthen the resilience strength of piston, syringe is had widely to be used, can be in above-mentioned piston 61,61a, 61b, the 61c central interior is axially established a spring assembly 65, shown in Fig. 8 and Fig. 8 A, the piston form that other similar column or other body constituted certainly, 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.
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, wherein this active device can be located at syringe needle and plunger front end one of them, this mechanism that pulls back can be located at syringe needle that active device do not install and plunger front end one of them, after active device activated the mechanism that pulls back, this syringe needle mechanism that can automatically be pulled back retracted and enters syringe inside.Its operating principle 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 this areas possess ordinary skill person 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 Fig. 9 again, when implementing, needle body 41 ' also can be designed to movable combination and the combination of dismantling with needle stand 42 ', to draw 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 (Lure Slip), Fig. 9 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, and has following advantage:
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 in syringe Section 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 applies in addition Strength cause 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 To the inwall top in needle cylinder injection space, make syringe in sufficient exhaust, or accurately from the zero graduation of syringe Begin to draw medicament, reach good pharmaceutical quantities control.
Claims (12)
1, a kind of haulback safety syringe is characterized in that comprising:
One syringe needle, its bottom 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 advances injection space in syringe by syringe below, and the front end of plunger is provided with a piston, the upper end of piston be provided with one can with bonded second convergence part, first convergence part, wherein piston is telescopic elastic device, is subjected to force compresses and answer.
2, haulback safety syringe as claimed in claim 1 is characterized in that, piston is formed by the elastomer storehouse of two opposed circular cone shapes.
3, haulback safety syringe as claimed in claim 1 is characterized in that, piston is formed by at least two discoid elastomer storehouses.
4, haulback safety syringe as claimed in claim 1 is characterized in that, piston is the column elastomer of a middle constriction.
5, haulback safety syringe as claimed in claim 1 is characterized in that, piston is that a surface is the column elastomer of spiral.
6, haulback safety syringe as claimed in claim 1 is characterized in that, the compressed restoring force of piston is greater than the predetermined adhesion of syringe needle and syringe needle socket.
7, haulback safety syringe as claimed in claim 1 is characterized in that, internal piston central authorities are axially arranged with a spring assembly.
8, haulback safety syringe as claimed in claim 1, it is characterized in that, first convergence part of this 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 is to be contact condition with piston-top surface.
9, haulback safety syringe as claimed in claim 1 is characterized in that, this syringe needle comprises a needle body and a needle stand, and this needle body secure bond is on needle stand.
10, haulback safety syringe as claimed in claim 1 is characterized in that, this syringe needle comprises a needle body and a needle stand, and this needle body can be incorporated on the needle stand with changeing.
11, haulback safety syringe as claimed in claim 1 is characterized in that, hook portion is located at a piston boit front end, and this piston boit is located at the front end of plunger, for the support of piston.
12, a kind of haulback safety syringe is characterized in that comprising:
One syringe needle;
One syringe, its 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;
One plunger, by the injection space that advances below the syringe in syringe, the front end of plunger is provided with a piston, and wherein piston is telescopic elastic device, is subjected to force compresses and answer;
One active device, be located at syringe needle and plunger front end one of them; And
One mechanism that pulls back, be located at syringe needle that this active device do not install and plunger front end one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104347 CN2684846Y (en) | 2003-11-18 | 2003-11-18 | Back pulling safety syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104347 CN2684846Y (en) | 2003-11-18 | 2003-11-18 | Back pulling safety syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2684846Y true CN2684846Y (en) | 2005-03-16 |
Family
ID=34661546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320104347 Expired - Fee Related CN2684846Y (en) | 2003-11-18 | 2003-11-18 | Back pulling safety syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2684846Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081346A1 (en) * | 2008-12-30 | 2010-07-22 | Lin Zuoqian | Low residue safety self-destroying syringe |
-
2003
- 2003-11-18 CN CN 200320104347 patent/CN2684846Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010081346A1 (en) * | 2008-12-30 | 2010-07-22 | Lin Zuoqian | Low residue safety self-destroying syringe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050316 Termination date: 20111118 |