CN202982813U - Push rod pullback position limit structure of syringe - Google Patents
Push rod pullback position limit structure of syringe Download PDFInfo
- Publication number
- CN202982813U CN202982813U CN 201220574503 CN201220574503U CN202982813U CN 202982813 U CN202982813 U CN 202982813U CN 201220574503 CN201220574503 CN 201220574503 CN 201220574503 U CN201220574503 U CN 201220574503U CN 202982813 U CN202982813 U CN 202982813U
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- CN
- China
- Prior art keywords
- push rod
- locating part
- cylindrical shell
- limiting structure
- position limiting
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- Expired - Fee Related
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Abstract
The utility model discloses a push rod pullback position limit structure of a syringe, and solves the problems that an existing self-destruction syringe is large in operation danger and inconvenient to operate when performs a self-destruction operation. The technical scheme includes that the syringe comprises a barrel and a push rod, the inner end portion of the push rod is inserted into the barrel, and the outer end portion of the push rod is located on the outer side of the barrel. The push rod pullback position limit structure of the syringe is characterized by comprising an annular position limit piece arranged on the inner side of an opening of the barrel, wherein the position limit piece and the barrel are fixed relative to the axial direction, the push rod passes through the position limit piece, a clamping piece is arranged on the inner side of the position limit piece, and a position limit body clamped with the clamping piece is arranged on the inner end side of the push rod.
Description
Technical field
This utility model relates to a kind of disposable medical plastic injector, relates in particular to a kind of being used for the size of pulling back of push rod is carried out spacing position limiting structure after syringe is finished using.
Background technology
At medical instruments field, injector for medical purpose is all generally disposable.For preventing bad medical institutions reusing disposable syringe, be provided with self-distruction structure on some syringes, namely along its circumferential arrangement, gap arranged on push rod, this syringe is after finishing using, push rod is pulled back outside syringe, and can be push rod from the opening position switch out.
As Chinese utility model patent (publication number: disclose a kind of self-destruction syringe of retractable needle CN201578701U), belonged to technical field of medical instruments.It has solved the problem that existing self-destruction syringe injection effect is poor, assembly difficulty is large, production cost is high.it comprises the injection rod in injection tube and injection tube, be provided with an energy in the front end of injection tube and syringe needle be fixed thereon and have the needle holder of liquid-through hole, be provided with between needle holder and injection tube and can prevent that needle holder axially breaks away from forward the prelocalization mechanism of injection tube, has the bar head that injection rod and needle holder can be linked together at the front end of injection rod, be provided with the rear detent mechanism that can prevent that needle holder from axially moving backward between needle holder rear end and injection tube, be connected with needle holder when injection rod and injection rod when axially moving backward, rear detent mechanism can lose efficacy under the tilting action power of injection rod, and then injection rod drive needle holder is axially moved backward.This utility model job stability is high, and is easy to use, smooth and easy, rapid operation.
In the syringe of this structure, because the oral area of cylindrical shell is open, be not provided for pulling back of push rod carried out spacing structure, when pulling back push rod, if firmly excessive, can pull out the cylindrical shell outside to needle holder fully, so dangerous when this has increased the self-destruction operation on the one hand if will realize self-destruction on the other hand, needs again the inner end of push rod to be inserted in cylindrical shell, difficulty when this has increased syringe self-destruction operation has been brought inconvenience to user.
Summary of the invention
For overcoming defects, this utility model technical issues that need to address: a kind of injector push-rod position limiting structure of pulling back is provided, this position limiting structure can effectively carry out spacing to the push rod of pulling back, the danger in the time of can effectively reducing syringe self-destruction operation facilitates the self-destruction operation of syringe.
For solveing the technical problem, the technical solution of the utility model: a kind of injector push-rod position limiting structure of pulling back, described syringe comprises cylindrical shell and push rod, and the inner end of push rod is plugged in cylindrical shell, and the outer end is positioned at outside cylindrical shell, it is characterized in that, comprise the locating part of being located at cylindrical shell oral area interior annular, fixing to axial between locating part and cylindrical shell, push rod passes locating part, the locating part inboard is provided with shackle member, in push rod distolateral be provided with for the shackle member limit body of clamping mutually.Push rod after certain size of pulling back out, the limit body on distolateral in push rod can with locating part on shackle member be connected together mutually, continued to pull back and limit push rod, so as not to make push rod fully and cylindrical shell be separated.
As preferably, the locating part outer peripheral face is provided with the convex body of annular, and the corresponding position on internal circumference surface in barrel is provided with the groove of annular, and convex body is connected in groove.By the clamping between convex body and groove, can effectively realize the axial stability between locating part and cylindrical shell, simple and reliable for structure.
As preferably, the surface of convex body is convex globoidal, and the bottom surface of groove is cancave cambered surface.This conveniently is assembled to locating part in cylindrical shell.
As preferably, coordinate for step surface between the wall body of distolateral and cylindrical shell in locating part.By the cooperation of step surface, can be effectively position for the position of locating part in cylindrical shell.
As preferably, described shackle member is some claws that are connected as a single entity with locating part, and these claws are distributed on the inner peripheral surface of locating part ringwise, and they are oblique stretches to the interior distolateral of locating part.The oblique claw that stretches out be convenient to push rod on the clamping of limit body phase, and these claws can not hinder push rod and be inserted in cylindrical shell, facilitate the assembling of syringe.
As preferably, described limit body is in the form of annular discs, and itself and push rod are that homogeneous material is one-body molded.Discoid limit body can stably realize with above-mentioned claw between clamping coordinate.
As preferably, the distolateral gap that is provided with in push rod, gap is corresponding with distance and the distance between shackle member inner end and cylindrical shell oral area between limit body.These two distances are corresponding, refer to that the difference between them is little, preferably equate, thereby are convenient to from opening position switch out push rod.
As preferably, the outer rim of locating part outer end is provided with the bulge loop that is connected as a single entity with it, is provided with heavy hole in the oral area outer rim of cylindrical shell, and bulge loop is positioned at heavy hole.Be plugged in heavy hole by bulge loop, can limit on the one hand the rigging position between locating part and cylindrical shell, also can deviate from by the tight fit between bulge loop and heavy hole on the other hand the reliability when having improved syringe self-destruction operation in cylindrical shell and limit locating part.
Therefore, the beneficial effects of the utility model: described locating part is set by the oral area inboard at cylindrical shell, can effectively limit push rod reaches the cylindrical shell outside when pulling back size, push rod can not be deviate from cylindrical shell fully, has reduced syringe dangerous when self-destruction operates.And setting position that can be by gap on push rod is selected, and the speed when improving syringe self-destruction operation.
Description of drawings
Fig. 1 is the longitudinal sectional view with this position limiting structure syringe.
Fig. 2 is the state diagram when operating with the self-destruction of this position limiting structure syringe.
Fig. 3 is the A section enlarged drawing in Fig. 2.
The specific embodiment
This utility model injector push-rod pull back position limiting structure be applied in can be type self-destroyed syringe on, the structure of syringe comprises cylindrical shell 1 and push rod 2, the inner end of push rod 2 is plugged in cylindrical shell 1, the outer end is positioned at the outside of cylindrical shell 1.The main part of this position limiting structure is the locating part 3 of annular, and locating part 3 is arranged on the oral area inboard of cylindrical shell 1, and is fixing to axial between locating part 3 and cylindrical shell 1.Be provided with limit body 5 on push rod 2 interior distolateral, inboard at locating part 3 is provided with shackle member, push rod 2 is when being pulled back, follow push rod 2 when moving to the shackle member position until limit body 5, shackle member is by being connected on limit body 5, continued to pull out and limit push rod 2, the inner end of push rod 2 rests in cylindrical shell 1.
For realizing fixing to axial between locating part 3 and cylindrical shell 1, coordinate for step surface between the wall body of the inner end of locating part 3 and cylindrical shell 1; The outer peripheral face of locating part 3 is provided with the convex body 7 of the annular that is connected as a single entity with it, and on cylindrical shell 1 inner peripheral surface, the corresponding position is provided with the groove of annular, and convex body 7 is connected in groove; The oral area outer rim place of cylindrical shell 1 is provided with the heavy hole of annular, and the outer rim place of locating part 3 outer ends is provided with the bulge loop 8 that is connected as a single entity with it, and bulge loop 8 is positioned at heavy hole, and the oral area of cylindrical shell 1 is concordant with the outer end of locating part 3.For ease of locating part 3 is assembled in cylindrical shell 1, the surface of convex body 7 is convex globoidal, and the bottom surface of groove is cancave cambered surface.
The inboard set shackle member of locating part 3 are some claws 6, and claw 6 is that homogeneous material is one-body molded with locating part 3, and these claws 6 are distributed on the inner peripheral surface of locating part 3 ringwise, and claw 6 is towards the inner skew back of locating part 3 to stretching out.
Limit body 5 is in the form of annular discs, and limit body 5 is that homogeneous material is one-body molded with push rod 2.Push rod 2 is provided with the gap 4 of " V " shape, and the distance between gap 4 and limit body 5 and limit body 5 generally equate with distance between cylindrical shell 1 oral area.
Claims (8)
1. injector push-rod position limiting structure of pulling back, described syringe comprises cylindrical shell and push rod, the inner end of push rod is plugged in cylindrical shell, the outer end is positioned at outside cylindrical shell, it is characterized in that, comprises the locating part of being located at cylindrical shell oral area interior annular, fixing to axial between locating part and cylindrical shell, push rod passes locating part, and the locating part inboard is provided with shackle member, in push rod distolateral be provided with for the shackle member limit body of clamping mutually.
2. the injector push-rod according to claim 1 position limiting structure of pulling back, is characterized in that, the locating part outer peripheral face is provided with the convex body of annular, and the corresponding position on internal circumference surface in barrel is provided with the groove of annular, and convex body is connected in groove.
3. the injector push-rod according to claim 2 position limiting structure of pulling back, is characterized in that, the surface of convex body is convex globoidal, and the bottom surface of groove is cancave cambered surface.
4. the injector push-rod according to claim 2 position limiting structure of pulling back, is characterized in that, coordinates for step surface between the wall body of distolateral and cylindrical shell in locating part.
5. the injector push-rod according to claim 1 position limiting structure of pulling back, it is characterized in that, described shackle member is the claws that some and locating part are connected as a single entity, and these claws are distributed on the inner peripheral surface of locating part ringwise, and they are oblique stretches to the interior distolateral of locating part.
6. according to claim 1,2,3, the 4 or 5 described injector push-rods position limiting structure of pulling back, it is characterized in that, described limit body is in the form of annular discs, itself and push rod are that homogeneous material is one-body molded.
7. the injector push-rod according to claim 6 position limiting structure of pulling back, is characterized in that, the distolateral gap that is provided with in push rod, and gap is corresponding with distance and the distance between shackle member inner end and cylindrical shell oral area between limit body.
8. according to claim 1,2,3, the 4 or 5 described injector push-rods position limiting structure of pulling back, it is characterized in that, the outer rim of locating part outer end is provided with the bulge loop that is connected as a single entity with it, is provided with heavy hole in the oral area outer rim of cylindrical shell, bulge loop is positioned at heavy hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220574503 CN202982813U (en) | 2012-11-02 | 2012-11-02 | Push rod pullback position limit structure of syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220574503 CN202982813U (en) | 2012-11-02 | 2012-11-02 | Push rod pullback position limit structure of syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202982813U true CN202982813U (en) | 2013-06-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220574503 Expired - Fee Related CN202982813U (en) | 2012-11-02 | 2012-11-02 | Push rod pullback position limit structure of syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202982813U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107174698A (en) * | 2017-05-03 | 2017-09-19 | 贝普医疗科技有限公司 | A kind of injector for medical purpose |
-
2012
- 2012-11-02 CN CN 201220574503 patent/CN202982813U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107174698A (en) * | 2017-05-03 | 2017-09-19 | 贝普医疗科技有限公司 | A kind of injector for medical purpose |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20191102 |