CN103285457B - Air compression core bar structure of self-destroying syringe - Google Patents
Air compression core bar structure of self-destroying syringe Download PDFInfo
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- CN103285457B CN103285457B CN201310202712.7A CN201310202712A CN103285457B CN 103285457 B CN103285457 B CN 103285457B CN 201310202712 A CN201310202712 A CN 201310202712A CN 103285457 B CN103285457 B CN 103285457B
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- core bar
- rod
- internal core
- endoporus
- wall
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Abstract
The invention discloses an air compression core bar structure of a self-destroying syringe. The air compression core bar structure comprises a core bar. The core bar comprises an outer core bar and an inner core bar, and the inner core bar is divided into a head, a connecting portion and a tail; the head of the inner core bar is hermetically and fittingly connected with the front end of an inner hole of the outer core bar; the outer diameter of the connecting portion of the inner core bar is smaller than that of the tail of the inner core bar, and a stress boss is formed at a joint of the connecting portion and the tail of the inner core bar; a sealing ring is hermetically connected to the outer wall of the tail of the inner core bar in a sleeved manner, and the outer wall of the sealing ring is hermetically connected with the wall of the inner hole of the outer core bar, so that a sealed air cavity is formed in a section of the stress boss and corresponds to the inner hole of the outer core bar, the sealing ring can be driven by an inner push rod to forwardly slide to squeeze the air cavity, and the inner push rod is abutted to the lower end surface of the sealing ring; the diameter of an inner hole of the inner push rod is larger than the maximum outer diameter of the inner core bar. The air compression core bar structure has the advantages that the inner core bar of the core bar in the design can be quickly retracted under a high-pressure effect realized by means of air compression, the air compression core bar structure is simple and is convenient to assemble, and contamination of liquid medicine is fundamentally precluded.
Description
Technical field
The present invention relates to self-destroyed syringe, particularly the air compression type core bar structure of self-destroyed syringe.
Background technology
For the consideration avoiding the medical hidden danger such as cross infection, self-destruction syringe is widely used.At present, self-destruction syringe type is on the market a lot, and wherein one adopts inside and outside two core bar structure, and this syringe is when self-destruction, and internal core rod drives needle tip retracts on needle stand and needle stand in the middle of the endoporus of outer core bar, realizes the self-destruction of syringe with this.But in above structure, the retraction of internal core rod is all realized by the promotion of flexible member, not only accessory is many, cost is high, assembles also more difficult simultaneously, and what most importantly flexible member generally adopted is metal spring, and the easy oxidation and rusting of metal spring, once the sealing between inside and outside core bar goes wrong, will liquid medicine contamination be caused, and then bring certain potential safety hazard.
Summary of the invention
For the problems referred to above, the present invention devises a kind of air compression type core bar structure of self-destroyed syringe, the High Pressure that this core bar utilizes air compressing to produce is to realize the snapback of internal core rod, and not only structure is simple, easy to assembly, has fundamentally stopped the generation of liquid medicine contamination phenomenon simultaneously.
For the problems referred to above, the present invention realizes by the following technical solutions:
An air compression type core bar structure for self-destroyed syringe, comprises core bar, and described core bar is made up of outer core bar and internal core rod, it is characterized in that: described internal core rod is divided into head, connecting portion and afterbody three part; Wherein internal core rod head outer diameter is minimum and be connected with the endoporus forward end seal of outer core bar; The external diameter of described internal core rod connecting portion is less than the external diameter of afterbody and forms a stress boss in both junctions; Described internal core rod afterbody outer wall sealing shroud is ined succession a sealing ring, the outer wall of sealing ring and the inner hole wall of outer core bar are tightly connected and make the outer core bar endoporus section corresponding to described stress boss form a confined air air cavity, and the inner push-rod that described sealing ring can hold in its lower surface extrudes described air chamber towards front slide under driving and produces the compressed air that internal core rod can be driven to bounce back; The endoporus aperture of described inner push-rod is greater than the maximum outside diameter of internal core rod.
Further, above-mentioned internal core rod head be provided with the intermediate incline that can coordinate with outer core bar endoporus forward end seal between connecting portion.
Further, the top of above-mentioned internal core rod head is provided with the draw-in groove or block tongue that can be connected with needle stand.
Further, be provided with between the endoporus of above-mentioned outer core bar and the outer wall of inner push-rod and engage position constraint structure, when the restraining forces of this engaging position constraint structure is greater than injector to inject, before core bar, push away the counteracting force be subject to.
Further, above-mentioned engaging position constraint structure comprises slot and engaging protrusion, and slot and engaging protrusion select one be arranged on the inner hole wall of outer core bar and the outer wall of inner push-rod.
Further, the bottom of above-mentioned inner push-rod is provided with pressing board.
Further, be convexly equipped with locking projection bottom the endoporus of above-mentioned inner push-rod, locking projection can with the shoulder hole tight fit being positioned at internal core rod bottom.
In an initial condition, the head of internal core rod and the endoporus forward end seal of outer core bar are connected, internal core rod afterbody outer wall is tightly connected by the endoporus of sealing ring and outer core bar, and then makes the outer core bar endoporus section at internal core rod stress boss place form an airtight air chamber.
When injecting, the pressing board pinning inner push-rod afterbody promotes forward, because pushing away the counteracting force be subject to before core bar when outer core bar and the restraining forces of the engaging position constraint structure between inner push-rod are greater than injector to inject, now inner push-rod mutually externally core bar do not move, inside and outside for drive core bar together synchronously reach is carried out injection operation, this process is until injection is complete, and now the draw-in groove of internal core rod head or block tongue realize being connected together with needle stand.
Then inner push-rod is pressed further, make the constraint release of outer core bar and the engaging position constraint structure between inner push-rod, and press inner push-rod further, band dynamic seal ring relative internal core rod afterbody outer wall forward slip, and make airtight air chamber volume reduce and make the air pressure in it sharply increase, this process is until the air pressure in confined air air cavity is enough large, the air pressure active force acted on internal core rod stress boss is made to be greater than frictional force between internal core rod afterbody outer wall and sealing ring, now internal core rod will be pushed and quick rear bullet, drive needle stand and needle point fast together with in be reduced to inner push-rod endoporus bottom, and make the latch protrusion bottom the shoulder hole of internal core rod bottom and inner push-rod endoporus realize the locked of close-fitting, complete effective self-destruction of syringe.
Core bar of the present invention eliminates elastic element structure, and the High Pressure utilizing air compressing to produce is to realize the snapback of internal core rod, and not only structure is simple, easy to assembly, has fundamentally stopped the generation of liquid medicine contamination phenomenon simultaneously.
Accompanying drawing explanation
Fig. 1, structural representation of the present invention;
The structural representation of Fig. 2, the outer core bar of the present invention;
The structural representation of Fig. 3, internal core rod of the present invention;
The structural representation of Fig. 4, inner push-rod of the present invention;
Fig. 5, inner push-rod of the present invention promote the structural representation that the relative internal core rod of sealing ring is slided;
Structural representation after Fig. 6, self-destruction of the present invention.
Detailed description of the invention
As illustrated in fig. 1 and 2, a kind of air compression type core bar structure of self-destroyed syringe, comprises core bar, and described core bar is made up of outer core bar 1 and internal core rod 2.
As shown in Figure 3, described internal core rod 2 is divided into head 21, connecting portion 22 and isometrical afterbody 23 3 part.
Wherein internal core rod head 21 external diameter is minimum and be connected with endoporus 11 forward end seal of outer core bar 1.The top of internal core rod head 21 is provided with the draw-in groove 211 that can be connected with needle stand, also can be set as block tongue structure as required in practice.The head 21 of described internal core rod be provided with the intermediate incline 212 that can coordinate with outer core bar endoporus 11 forward end seal between connecting portion 22, effectively strengthen the connection sealing energy between internal core rod head 21 and outer core bar endoporus 11 front end with this.
The external diameter of described internal core rod connecting portion 22 is less than the external diameter of afterbody 23 and forms a stress boss 231 in both junctions.
Described internal core rod afterbody 23 outer wall sealing shroud is ined succession a sealing ring 3, the outer wall of sealing ring 3 and the inner hole wall of outer core bar 1 are tightly connected and make the outer core bar endoporus 11 sections corresponding to described stress boss 231 form a confined air air cavity 4, and the inner push-rod 5 that described sealing ring 3 can hold in its lower surface extrudes described air chamber 4 towards front slide under driving and produces the compressed air that internal core rod 2 can be driven to bounce back.
As shown in figs. 1 and 4, endoporus 51 aperture of described inner push-rod 5 is greater than the maximum outside diameter of internal core rod 2.The bottom of inner push-rod 5 is provided with pressing board 52.Be convexly equipped with locking projection 511 bottom the endoporus 51 of inner push-rod 5, locking projection 511 can with shoulder hole 24 tight fit being positioned at internal core rod 2 bottom.
Be provided with between the endoporus 11 of described outer core bar 1 and the outer wall of inner push-rod 5 and engage position constraint structure 6, when the restraining forces of this engaging position constraint structure 6 is greater than injector to inject, before core bar, push away the counteracting force be subject to.In the present embodiment, engaging position constraint structure 6 comprises slot 61 and engaging protrusion 62, and wherein engaging protrusion 62 is arranged on the inner hole wall of outer core bar 1, and slot 61 is arranged on the outer wall of inner push-rod 5, in practice, slot 61 and engaging protrusion 62 also interchangeable setting.
In an initial condition, as shown in Figure 1, the head 21 of internal core rod 2 is connected with endoporus 11 forward end seal of outer core bar 1, internal core rod afterbody 23 outer wall is tightly connected by the endoporus 11 of sealing ring 3 with outer core bar 1, and then makes the outer core bar endoporus 11 sections at internal core rod stress boss 231 place form an airtight air chamber 4.
When injecting, the pressing board 52 pinning inner push-rod 5 afterbody promotes forward, because pushing away the counteracting force be subject to before core bar when outer core bar 1 and the restraining forces of the engaging position constraint structure 6 between inner push-rod 5 are greater than injector to inject, now the mutually external core bar 1 of inner push-rod 5 does not move, inside and outside for drive core bar 1,2 together synchronous reach is carried out injection operation, this process is until injection is complete, and now the draw-in groove 211 of internal core rod head 21 or block tongue realize being connected together with needle stand.
Extract after syringe needle leaves human body medical personnel, then inner push-rod 5 is pressed further, make the constraint release of outer core bar 1 and the engaging position constraint structure 6 between inner push-rod 5, and press inner push-rod 5 further, promote sealing ring 3 internal core rod afterbody 23 outer wall forward slip relatively, its structure as shown in Figure 5, airtight air chamber 4 volume is made to reduce and make the air pressure in it sharply increase, this process is until the air pressure in confined air air cavity 4 is enough large, the air pressure active force acted on internal core rod stress boss 231 is made to be greater than frictional force between internal core rod afterbody 23 outer wall and sealing ring 3, or this process is until sealing ring 3 slides into connecting portion 22 from the afterbody 23 of internal core rod, the active force that now pressure-air acts on stress boss 231 will promote internal core rod 2 fast after bullet, drive needle stand 7 and needle point 8 fast together with in be reduced to inner push-rod 5 endoporus 51 bottom, and make the shoulder hole 24 of internal core rod bottom realize the locked of close-fitting with the latch protrusion 511 bottom inner push-rod endoporus 51, complete effective self-destruction of syringe, its structure as shown in Figure 6.
Core bar of the present invention eliminates elastic element structure, and the High Pressure utilizing air compressing to produce is to realize the snapback of internal core rod 2, and not only structure is simple, easy to assembly, has fundamentally stopped the generation of liquid medicine contamination phenomenon simultaneously.
The above, it is only better embodiment of the present invention, not any pro forma restriction is done to invention, every according to know-why of the present invention to any simple modification made for any of the above embodiments, equivalent variations or modification, still belong in the scope of technical solution of the present invention.
Claims (7)
1. an air compression type core bar structure for self-destroyed syringe, comprises core bar, and described core bar is made up of outer core bar and internal core rod, it is characterized in that: described internal core rod is divided into head, connecting portion and afterbody three part; Wherein internal core rod head outer diameter is minimum and be connected with the endoporus forward end seal of outer core bar; The external diameter of described internal core rod connecting portion is less than the external diameter of afterbody and forms a stress boss in both junctions; Described internal core rod afterbody outer wall sealing shroud is ined succession a sealing ring, the outer wall of sealing ring and the inner hole wall of outer core bar are tightly connected and make the outer core bar endoporus section corresponding to described stress boss form a confined air air cavity, and the inner push-rod that described sealing ring can hold in its lower surface extrudes described air chamber towards front slide under driving and produces the compressed air that internal core rod can be driven to bounce back; The endoporus aperture of described inner push-rod is greater than the maximum outside diameter of internal core rod.
2. core bar structure as claimed in claim 1, is characterized in that: the head of described internal core rod be provided with the intermediate incline that can coordinate with outer core bar endoporus forward end seal between connecting portion.
3. core bar structure as claimed in claim 1 or 2, is characterized in that: the top of described internal core rod head is provided with the draw-in groove or block tongue that can be connected with needle stand.
4. core bar structure as claimed in claim 1, it is characterized in that: be provided with between the endoporus of described outer core bar and the outer wall of inner push-rod and engage position constraint structure, when the restraining forces of this engaging position constraint structure is greater than injector to inject, before core bar, push away the counteracting force be subject to.
5. core bar structure as claimed in claim 4, is characterized in that: described engaging position constraint structure comprises slot and engaging protrusion, and slot and engaging protrusion select one be arranged on the inner hole wall of outer core bar and the outer wall of inner push-rod.
6. the core bar structure as described in the arbitrary claim of claim 1,4,5, is characterized in that: the bottom of described inner push-rod is provided with pressing board.
7. core bar structure as claimed in claim 6, it is characterized in that: be convexly equipped with locking projection bottom the endoporus of described inner push-rod, locking projection can with the shoulder hole tight fit being positioned at internal core rod bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310202712.7A CN103285457B (en) | 2013-05-28 | 2013-05-28 | Air compression core bar structure of self-destroying syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310202712.7A CN103285457B (en) | 2013-05-28 | 2013-05-28 | Air compression core bar structure of self-destroying syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103285457A CN103285457A (en) | 2013-09-11 |
| CN103285457B true CN103285457B (en) | 2015-04-15 |
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| CN201310202712.7A Expired - Fee Related CN103285457B (en) | 2013-05-28 | 2013-05-28 | Air compression core bar structure of self-destroying syringe |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104027874A (en) * | 2014-06-19 | 2014-09-10 | 杨育和 | Retractable type safe injection syringe with changeable needle |
| CN109701115A (en) * | 2018-11-30 | 2019-05-03 | 衡刚 | A kind of automatic self-destruction syringe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203244652U (en) * | 2013-05-28 | 2013-10-23 | 江波 | Air compression type core rod structure of self-destruction injector |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2224630Y (en) * | 1994-10-26 | 1996-04-17 | 周正龙 | Automatic air-pressure syringe |
| WO2006063377A1 (en) * | 2004-12-14 | 2006-06-22 | Global Medisafe Holdings Pty Limited | Extendable auto retractable medical syringe |
| MX2007011237A (en) * | 2005-03-14 | 2008-01-21 | Global Medisafe Holdings Ltd | Auto retractable syringe. |
| JP5599394B2 (en) * | 2008-07-17 | 2014-10-01 | メディガード・リミテッド | Retractable syringe |
| CN102698346A (en) * | 2012-06-30 | 2012-10-03 | 蔡根顺 | Air-pressure-type retraction self-destruction syringe |
| CN103083767A (en) * | 2013-02-21 | 2013-05-08 | 张亚平 | Improved-type positive-pressure-retraction-type safe injector |
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2013
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203244652U (en) * | 2013-05-28 | 2013-10-23 | 江波 | Air compression type core rod structure of self-destruction injector |
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| CN103285457A (en) | 2013-09-11 |
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Granted publication date: 20150415 Termination date: 20200528 |