CN100408120C - Changeable needle structure of needle retraction type injector, and said injector - Google Patents
Changeable needle structure of needle retraction type injector, and said injector Download PDFInfo
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- CN100408120C CN100408120C CNB2006100671603A CN200610067160A CN100408120C CN 100408120 C CN100408120 C CN 100408120C CN B2006100671603 A CNB2006100671603 A CN B2006100671603A CN 200610067160 A CN200610067160 A CN 200610067160A CN 100408120 C CN100408120 C CN 100408120C
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Abstract
The present invention provides a changeable needle structure of a needle retraction type injector, which comprises a needle (1), a needle seat (2), a needle seat sleeve barrel (3), a spring (4) and a sealing ring (5), wherein the needle seat sleeve barrel (3) comprises a first sleeve barrel (301) and a second sleeve barrel (302), when assembled, the first sleeve barrel is connected with the second sleeve barrel into integration; structure which can be fixedly connected with the front end of the injector in a releasable mode is arranged on the first sleeve barrel (301) and the second sleeve barrel (302), and the needle seat (2) is arranged in the needle seat sleeve barrel (3); the needle (1) is fixed to the needle seat (2), and the sealing ring (5) is sheathed on a groove (202) of the back end of the needle seat (2); the spring (4) is sheathed on the needle seat (2). The present invention also provides a needle retraction type injector with changeable needle structure. The needle structure and the needle retraction type injector can separately assemble the needle part and a needle cylinder part, and can assemble the needle part and the needle cylinder part into a whole. The needle is changed to use by users according to using requirements.
Description
Technical field
The present invention relates to a kind of medical apparatus and instruments, particularly relate to a kind of changeable type needle head structure and needle retraction type syringe that is used for the needle retraction type syringe.
Background technology
In medical field, syringe often is a large amount of medical apparatus and instruments that use.If syringe is reused, be easy to cause the cross infection of disease, the harm public health between different patients.Be repeated to use for fear of syringe, Chinese ZL01221139.7 utility model patent has proposed a kind of safety self-destructing disposable syringe that can make syringe needle retract syringes inside after injection finishes.This technical scheme is by being fixed on syringe needle in the needle stand that is equipped with spring, when injection finishes, syringe needle rebounds under the effect of spring in the push rod of hollow, thereby realize the self-destruction of syringe and avoid reusing, and eliminated because of the injection back syringe needle that finishes and be exposed to the risk that the accident of stabbing is caused in the outside.
But in above-mentioned technical scheme, the syringe needle of needle retraction type syringe must be one with the syringe part fixed installation when assembling, and after the assembling, the syringe needle part can not be changed, make the user in use can't select suitable syringe needle or syringe as required for use, assembling is used voluntarily again, perhaps changes syringe needle as required, thereby has caused the inconvenience of using.
Summary of the invention
The object of the present invention is to provide a kind of needle retraction type syringe that is used for the changeable type needle head structure of needle retraction type syringe and the changeable type needle head structure is housed, to make things convenient for the user in use to select suitable syringe needle or syringe as required for use, assembling is used voluntarily again, perhaps changes syringe needle as required and uses.
For achieving the above object, the invention provides a kind of changeable type needle head structure that is used for the needle retraction type syringe, comprise syringe needle 1, needle stand 2, needle stand sleeve 3, spring 4 and sealing ring 5; Described needle stand sleeve 3 comprises one first sleeve 301 and one second sleeve 302, the front end closure of described first sleeve 301 also is provided with pin hole, the rear end inwall of described second sleeve 302 is provided with the projection 303 of ring-type or arcuation, and the time connect as one in assembling with described first sleeve 301, described first sleeve 301 or second sleeve 302 be provided with can with the structure of syringe front end can the mode of throwing off to fixedly connected; Described needle stand 2 is a tubular body, there is a through hole centre, be respectively equipped with boss 201 and groove 202 on the outer wall of rear end, the external diameter at described needle stand boss 201 places is equal to or less than the internal diameter at described second sleeve 302 protruding 303 places, and described needle stand 2 is arranged in the described needle stand sleeve 3; Described syringe needle 1 is fixed in the through hole of described needle stand 2, and its front end stretches out from the pin hole of described first sleeve, 301 front ends; Described sealing ring 5 is nested with on the groove 202 of described needle stand 2 rear ends, and is bearing on the projection 303 of described second sleeve 302; Described spring 4 is enclosed within on the described needle stand 2, and its upper end withstands on the front inner wall of described first sleeve 301, and the lower end is bearing on the boss 201 of described needle stand 2 rear ends.
In changeable type needle head structure of the present invention, described first sleeve 301 and second sleeve 302 by its separately the snap-in structure or the helicitic texture that are provided with of connecting portion fixedly connected, perhaps undertaken fixedly connected by bonding or ultrasonic bonding mode; The structure that is used for fixedlying connected with the syringe front end on described first sleeve 301 or second sleeve 302 is helicitic texture, snap-in structure or connected structure.
In changeable type needle head structure of the present invention, the closed front end roof pressure of described first sleeve 301 upper end of described spring 4 and spring 4 is pressed in advance between the boss 201 of this closed front end and described needle stand 2.
In changeable type needle head structure of the present invention, described first sleeve 301 is after compressing described spring 4 in advance, and the lower edge face of its closed front end and described needle stand 2 vertical upper limb faces are fitted.
In changeable type needle head structure of the present invention, the pin hole of described first sleeve, 301 front ends has inside flared structure, also be provided with the pyramidal structure that matches with described flared structure shape on the correspondence position of described needle stand 2, after the assembling, the flared structure of described pin hole matches with the pyramidal structure of described needle stand 2.
In changeable type needle head structure of the present invention, the inwall of described second sleeve 302 with described sealing ring 5 contacts site above be provided with a circle and can make sealing ring 5 be pushed into wherein groove 304.
In changeable type needle head structure of the present invention, the snap-in structure of described connection first sleeve 301 and second sleeve 302 comprises draw-in groove on first sleeve 301 or Ka Tai or the bayonet lock 306 on the hole clipping 305 and second sleeve 302, and described draw-in groove or hole clipping 305 match with described Ka Tai or bayonet lock 306 respectively; The helicitic texture that described first sleeve 301 or second sleeve 302 are connected with the syringe front end can be located on the barrel of first sleeve 301 or second sleeve 302, described snap-in structure is hole clipping or the draw-in groove that is located on first sleeve 301 or second sleeve 302, described connected structure is the annular slot that forms between first sleeve, 301 inwalls and second sleeve, 302 outer walls, perhaps is located at the slot on second sleeve, 302 barrels.
For realizing purpose of the present invention, the present invention also provides a kind of needle retraction type syringe simultaneously, comprise syringe 7, needle head structure, can hold the barrel type push bar 6 of the syringe needle 1 of retraction, the seal gasket 8 that is located at the locking device and the flip flop equipment of barrel type push bar 6 front ends and is enclosed within barrel type push bar 6 heads, described needle head structure adopts aforesaid needle head structure; Described syringe 7 front ends are provided with the syndeton that can match with the fixed connection structure on the described needle stand sleeve 3.
Changeable type needle head structure that is used for the needle retraction type syringe proposed by the invention and the needle retraction type syringe that the changeable type needle head structure is housed, belong to the improvement to present technology, the part of wherein not addressing all adopts corresponding construction of the prior art.
Changeable type needle head structure that is used for the needle retraction type syringe and needle retraction type syringe proposed by the invention compared with prior art, have following outstanding substantive distinguishing features and significant technological progress:
Needle head structure provided by the present invention and needle retraction type syringe, simple in structure, easy for installation, both can be with syringe needle part and separately assembling of syringe part, select suitable syringe needle or syringe in use as required for use by the user, assembling is used voluntarily again, also the syringe needle part can be assembled into one with replaceable mode and syringe part, according to the use needs syringe needle be changed use by the user again.And under the situation that needle head structure is not installed together with syringe part, the packing of syringe and transportation are also more convenient.
Description of drawings
Fig. 1 is the sketch map of the changeable type needle head structure among the embodiment one.
Fig. 2 is installed in the sketch map of syringe front end for the changeable type needle head structure among the embodiment one.
Fig. 3 is the part sketch map of the changeable type needle head structure among the embodiment one.
Fig. 4 is the sketch map of the changeable type needle head structure among the embodiment two.
Fig. 5 is the sketch map of the needle retraction type syringe among the embodiment three.
The specific embodiment
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.
Embodiment one: as Fig. 1, Fig. 2 and shown in Figure 3
The changeable type needle head structure that is used for the needle retraction type syringe in the present embodiment comprises syringe needle 1, needle stand 2, needle stand sleeve 3, spring 4 and sealing ring 5;
On first sleeve 301 (also can on second sleeve 302) be helicitic texture (also can be snap-in structure or connected structure) with the syringe front end with the structure of can the mode of throwing off fixedlying connected, helicitic texture is located at (not shown) on the inwall of first sleeve 301;
The inwall of second sleeve 302 with sealing ring 5 contacts site above be provided with a circle and can make sealing ring 5 be pushed into wherein groove 304;
The closed front end roof pressure of first sleeve 301 upper end of described spring 4 and spring 4 is pressed between this closed front end and described needle stand 2 boss 201 in advance;
The pin hole of first sleeve, 301 front ends has inside flared structure, also is provided with the pyramidal structure that matches with described flared structure shape on the correspondence position of needle stand 2, and after the assembling, the flared structure of described pin hole matches with the pyramidal structure of needle stand 2.
Embodiment two: as shown in Figure 4
Changeable type needle head structure that is used for the needle retraction type syringe in the present embodiment and the structure basically identical of embodiment one, its difference is:
The rear end outer wall of first sleeve 301 is provided with Ka Tai, and the front end of second sleeve 302 is provided with the draw-in groove that matches with this Ka Tai, and first sleeve 301 is fixedlyed connected with draw-in groove by described Ka Tai with second sleeve 302;
The rear end of second sleeve 302 is the double-barrel structure that comprises inner core and urceolus, is helicitic texture with the syringe front end with the structure of can the mode of throwing off fixedlying connected, and helicitic texture is located on the barrel of urceolus of second sleeve, 302 rear ends.
Embodiment three: as shown in Figure 5
Needle retraction type syringe in the present embodiment comprises needle head structure, syringe and barrel type push bar;
Needle head structure adopts the needle head structure among the embodiment two;
Syringe adopts common syringe cylinder structure, and the syringe front end is provided with the helicitic texture that can match with the helicitic texture on the urceolus barrel of second sleeve, 302 rear ends;
During assembling, syringe part is screwed onto with needle head structure;
Barrel type push bar has a chamber, can be contained in the needle stand that rebounds after injection finishes, and the head ring set of barrel type push bar has seal gasket, and front end is provided with locking device and flip flop equipment;
Locking device is sealing tube chamber front end, when injection finishes, barrel type push bar is pushed into the top in syringe tube chamber, the rock-steady structure that flip flop equipment can get loose and form between the projection 303 by needle stand 2, sealing ring 5 and second sleeve 302 in the needle head structure, make needle stand 2 together with syringe needle 1 displacement backward under the effect of spring, and the promotion locking device, the tube intracavity of the barrel type push bar that rebounds together;
The rear end of barrel type push bar is provided with screening glass, to prevent before use making syringe generation self-destruction because of maloperation.
Claims (10)
1. a changeable type needle head structure that is used for the needle retraction type syringe comprises syringe needle (1), needle stand (2), needle stand sleeve (3), spring (4) and sealing ring (5), it is characterized in that:
Described needle stand sleeve (3) comprises one first sleeve (301) and one second sleeve (302), the front end closure of described first sleeve (301) also is provided with pin hole, the rear end inwall of described second sleeve (302) is provided with the projection (303) of ring-type or arcuation, described second sleeve (302) and described first sleeve (301) connect as one when assembling, described first sleeve (301) or second sleeve (302) be provided with can with the structure of syringe front end can the mode of throwing off to fixedly connected;
Described needle stand (2) is a tubular body, there is a through hole centre, be respectively equipped with boss (201) and groove (202) on the outer wall of rear end, the external diameter that the boss of described needle stand (201) is located is equal to or less than the internal diameter that the projection (303) of described second sleeve (302) is located, and described needle stand (2) is arranged in the described needle stand sleeve (3);
Described syringe needle (1) is fixed in the through hole of described needle stand (2), and its front end stretches out from the pin hole of described first sleeve (301) front end;
Described sealing ring (5) is nested with on the groove (202) of described needle stand (2) rear end, and is bearing on the projection (303) of described second sleeve (302);
Described spring (4) is enclosed within on the described needle stand (2), and its upper end withstands on the front inner wall of described first sleeve (301), and the lower end is bearing on the boss (201) of described needle stand (2) rear end.
2. needle head structure as claimed in claim 1, it is characterized in that: described first sleeve (301) and second sleeve (302) by its separately the snap-in structure or the helicitic texture that are provided with of connecting portion fixedly connected, perhaps undertaken fixedly connected by bonding or ultrasonic bonding mode; The structure that is used for fixedlying connected with the syringe front end on described first sleeve (301) or second sleeve (302) is helicitic texture, snap-in structure or connected structure.
3. needle head structure as claimed in claim 1 or 2 is characterized in that: the closed front end roof pressure of described first sleeve (301) the upper end of described spring (4) and spring (4) is pressed in advance between the boss (201) of this closed front end and described needle stand (2).
4. needle head structure as claimed in claim 3 is characterized in that: described first sleeve (301) is after compressing described spring (4) in advance, and the vertical upper limb face of the lower edge face of its closed front end and described needle stand (2) is fitted.
5. needle head structure as claimed in claim 3, it is characterized in that: the pin hole of described first sleeve (301) front end has inside flared structure, also be provided with the pyramidal structure that matches with described flared structure shape on the correspondence position of described needle stand (2), after the assembling, the flared structure of described pin hole matches with the pyramidal structure of described needle stand (2).
6. needle head structure as claimed in claim 3 is characterized in that: the inwall of described second sleeve (302) is provided with a circle in the top with described sealing ring (5) contact site can make sealing ring (5) be pushed into wherein groove (304).
7. needle head structure as claimed in claim 2, it is characterized in that: the snap-in structure of described connection first sleeve (301) and second sleeve (302) comprises draw-in groove on first sleeve (301) or Ka Tai or the bayonet lock (306) on hole clipping (305) and second sleeve (302), and described draw-in groove or hole clipping (305) match with described Ka Tai or bayonet lock (306) respectively; Described first sleeve (301) or second sleeve (302) are gone up the helicitic texture that is connected with the syringe front end and are located on the barrel of first sleeve (301) or second sleeve (302), it is hole clipping or the draw-in groove that is located on first sleeve (301) or second sleeve (302) that described first sleeve (301) or second sleeve (302) are gone up the snap-in structure that is connected with the syringe front end, described connected structure is the annular slot that forms between first sleeve (301) inwall and second sleeve (302) outer wall, perhaps is located at the slot on second sleeve (302) barrel.
8. needle retraction type syringe, comprise syringe (7), needle head structure, can hold the barrel type push bar (6) of the syringe needle (1) of retraction, the seal gasket (8) that is located at the locking device and the flip flop equipment of barrel type push bar (6) front end and is enclosed within barrel type push bar (6) head, it is characterized in that described needle head structure adopts the described needle head structure of claim 3; Described syringe (7) front end is provided with the syndeton that can match with the fixed connection structure on the described needle stand sleeve (3).
9. needle retraction type syringe, comprise syringe (7), needle head structure, can hold the barrel type push bar (6) of the syringe needle (1) of retraction, the seal gasket (8) that is located at the locking device and the flip flop equipment of barrel type push bar (6) front end and is enclosed within barrel type push bar (6) head, it is characterized in that: described needle head structure adopts the described needle head structure of claim 5; Described syringe (7) front end is provided with the syndeton that can match with the fixed connection structure on the described needle stand sleeve (3).
10. needle retraction type syringe, comprise syringe (7), needle head structure, can hold the barrel type push bar (6) of the syringe needle (1) of retraction, the seal gasket (8) that is located at the locking device and the flip flop equipment of barrel type push bar (6) front end and is enclosed within barrel type push bar (6) head, it is characterized in that: described needle head structure adopts the described needle head structure of claim 7; The closed front end roof pressure of described first sleeve (301) the upper end of described spring (4) and spring (4) is pressed in advance between the boss (201) of this closed front end and described needle stand (2); Described syringe (7) front end is provided with the syndeton that can match with the fixed connection structure on the described needle stand sleeve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100671603A CN100408120C (en) | 2006-04-05 | 2006-04-05 | Changeable needle structure of needle retraction type injector, and said injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100671603A CN100408120C (en) | 2006-04-05 | 2006-04-05 | Changeable needle structure of needle retraction type injector, and said injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1861208A CN1861208A (en) | 2006-11-15 |
| CN100408120C true CN100408120C (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100671603A Active CN100408120C (en) | 2006-04-05 | 2006-04-05 | Changeable needle structure of needle retraction type injector, and said injector |
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| CN (1) | CN100408120C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020090B (en) * | 2007-03-30 | 2012-01-04 | 刘文杰 | Improved safety syringe with withdraw needle and its cylindrical push rod |
| GB2545266B (en) | 2015-12-11 | 2018-08-08 | Oval Medical Tech Limited | Autoinjector with retracting needle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114590A (en) * | 1994-07-08 | 1996-01-10 | 帕尔罗·卡塞利 | Safety syringe with automatically retractable hollow needle |
| CN1244430A (en) * | 1998-08-12 | 2000-02-16 | 刘文能 | Safety syringe with withdrawn needle |
| CN1293070A (en) * | 1999-10-15 | 2001-05-02 | 贝克顿迪肯森公司 | Injector with retractable needle |
| US6228054B1 (en) * | 1999-12-03 | 2001-05-08 | Edward D. Dysarz | Interchangeable safety needle cannula module that is activated by a safety syringe and plunger module |
| CN1585658A (en) * | 2001-04-26 | 2005-02-23 | Nmt股票上市集团公司 | Fluid handling devices, in particular for medical use |
| CN2892119Y (en) * | 2006-04-05 | 2007-04-25 | 刘文杰 | Exchangeable needle head structure for needle revertive back type injector and needle head revertive back type injector |
-
2006
- 2006-04-05 CN CNB2006100671603A patent/CN100408120C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114590A (en) * | 1994-07-08 | 1996-01-10 | 帕尔罗·卡塞利 | Safety syringe with automatically retractable hollow needle |
| CN1244430A (en) * | 1998-08-12 | 2000-02-16 | 刘文能 | Safety syringe with withdrawn needle |
| CN1293070A (en) * | 1999-10-15 | 2001-05-02 | 贝克顿迪肯森公司 | Injector with retractable needle |
| US6228054B1 (en) * | 1999-12-03 | 2001-05-08 | Edward D. Dysarz | Interchangeable safety needle cannula module that is activated by a safety syringe and plunger module |
| CN1585658A (en) * | 2001-04-26 | 2005-02-23 | Nmt股票上市集团公司 | Fluid handling devices, in particular for medical use |
| CN2892119Y (en) * | 2006-04-05 | 2007-04-25 | 刘文杰 | Exchangeable needle head structure for needle revertive back type injector and needle head revertive back type injector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1861208A (en) | 2006-11-15 |
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