CN202236683U - Sealing structure for deposable safe injector needle stand - Google Patents
Sealing structure for deposable safe injector needle stand Download PDFInfo
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- CN202236683U CN202236683U CN2011203789374U CN201120378937U CN202236683U CN 202236683 U CN202236683 U CN 202236683U CN 2011203789374 U CN2011203789374 U CN 2011203789374U CN 201120378937 U CN201120378937 U CN 201120378937U CN 202236683 U CN202236683 U CN 202236683U
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- needle stand
- small
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- annular projection
- big
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Abstract
The utility model discloses a sealing structure for a deposable safe injector needle stand. The sealing structure comprises a large needle stand and a small needle stand which is arranged in the large needle stand in a matching way, wherein an inner hole of the large needle stand is partitioned into a small-diameter upper hole section and a large-diameter lower hole section; a step is formed between the upper and the lower hole sections; an annular bump is formed by projecting downwards at a step position; after a gap between the annular bump and the lower hole section is connected with the head part of a needle cylinder in a matching way, a certain outward deformation allowance for the annular bump is left; the profile of the small needle stand is partitioned into a small-diameter upper section and a large-diameter lower section; the middle-upper part of the small-diameter upper section is in clearance fit with the upper hole section of the large needle stand; the lower part of the small-diameter upper section is provided with a conical structure of which the upper part is small and the lower part is large and which is in interference fit with the annular bump; and a boss which is formed on a joint between the upper and the lower sections is pressed against the bottom of the annular bump. In the sealing structure, an embedded piece structure is removed; and an entire product has the characteristics of good sealing effect and simple and convenient structure, and has contribution to stimulating the small needle stand.
Description
Technical field
The present invention relates to the hermetically-sealed construction of a kind of disposible safety syringe, particularly a kind of disposible safety syringe.
Background technology
At first, the applicant applied for two China's patent, was respectively: a kind of disposable needle point automatic retraction safety syringe, and the patent No. is: ZL200920116899.8; Disposable needle point automatic retraction safety syringe, the patent No. is: ZL200920305366.4.In the middle of these two patents, needle stand is formed by big needle stand and little needle stand, and epimere is positioned at big needle stand endoporus in the little needle stand, relies on stiction to be equipped with on big needle stand.At this; Little needle stand and big needle stand be connected and sealing only depends on the interference fit of both mating surfaces to realize; And for the effectiveness that guarantees to connect and seal, big needle stand endoporus is arranged to three shoulder hole structures, and little needle stand profile also is designed to three ladder outlines and cooperates with it; The complexity of size needle stand contour structures has all brought trouble for processing and assembling.Simultaneously because of in the middle of processing; Value of interference fit between the size needle stand is difficult to hold, if the magnitude of interference is bigger than normal, will cause the frictional resistance between little needle stand and the big needle stand to increase; The resistance that excites of little needle stand is heightened, in the middle of using, have and agree occur the stimulation failure phenomenon; And, can make the sealing between the large and small needle stand can not get guaranteeing again if the magnitude of interference is very few, the leakage problem takes place.
To the problems referred to above, the applicant has applied for patent: ZL200920308198.4 once more, a kind of structure-improved of disposible safety syringe needle stand; It has carried out design again to the hermetically-sealed construction between the big or small needle stand; The endoporus of said big needle stand is divided into hole section, mounting groove and following hole section, and the profile of little needle stand is divided into minor diameter epimere and major diameter hypomere, and forms a boss in the junction of said epimere and hypomere; When assembling; The mold insert that medical grade rubber TPE makes is set in the mounting groove, and hole section, mold insert endoporus cooperate on little needle stand minor diameter epimere and the big needle stand, and said boss and mold insert bottom surface offset.Above structure setting; Frictional force has guaranteed the sealing between big or small needle stand simultaneously between the big or small needle stand of minimizing, and the little needle stand stimulation failure phenomenon of effectively avoiding causing because of frictional force is excessive takes place, and has simplified each mating surface structure of big or small needle stand to a certain extent; Made things convenient for the processing of little needle stand; But find that through actual processing because of the mold insert in big needle stand and its endoporus mounting groove is to adopt different materials to generate through the priority integrated through injection molding, technology is too complicated; Efficient in the middle of the processing is lower, and defect rate is also very high.
Summary of the invention
To the problems referred to above, the present invention has designed a kind of hermetically-sealed construction of disposible safety syringe needle stand, and its mating surface structure to big or small needle stand is further improved; Removed the mold insert structure; Entire product has good sealing effect, the characteristics of features simple structure, and help exciting of little needle stand.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of hermetically-sealed construction of disposible safety syringe needle stand; Comprise big needle stand and the little needle stand that is equipped with in big needle stand; It is characterized in that: the endoporus of said big needle stand is divided on the minor diameter hole section under the hole section and major diameter; Form a step between the section of upper and lower hole, stepped portions convexes with an annular projection down, and certain annular projection distortion allowance is outwardly left in the gap between annular projection and the following hole section after being connected with the syringe head; The profile of said little needle stand is divided into minor diameter epimere and major diameter hypomere; The middle and upper part of its medium-small diameter epimere is divided with the intersegmental crack, last hole of needle stand greatly and is cooperated, the lower part of minor diameter epimere be set as up-small and down-big and with said annular projection interference fit the cone-shaped structure; Said upper and lower section junction forms a boss and the annular projection bottom offsets.
When assembling, little needle stand is inserted in the big needle stand, at this from the bottom up; When the cone-shaped structure of little needle stand minor diameter epimere lower part snaps in annular projection endoporus position; Because of both are relations of interference fit, along with little needle stand further on move, it is big that the diameter of cone-shaped structure further becomes; This will force annular projection dilatating and deformable outwardly gradually; This process offsets up to the junction boss and the annular projection bottom of upper and lower section of little needle stand profile, and meanwhile, little needle stand bottom snaps in and realizes stop bit in the elasticity support claw in the syringe head endoporus.
At this,, make the inner hole surface of annular projection all cover on the conical surface of cone-shaped structure basically because of having reset response power after the annular projection distortion; Both large-area contacts have been realized; Guaranteed effective sealing that big needle stand is connected with little needle stand, simultaneously, because of above reset response power is vertically to act on the conical surface; Total makes a concerted effort downwards; The effect of making a concerted effort will force little needle stand from the annular projection part, to eject downwards, and this is equivalent to excite the excitation power that provides extra to the retraction of little needle stand, in case break away from little needle stand bottom and the syringe elasticity support claw; Will under the dual function of core bar inner spring and above annular projection restoring force, bounce back rapidly, the phenomenon of fundamentally having stopped little needle stand retraction stimulation failure takes place.
Description of drawings
The structural representation of Fig. 1, the big needle stand of the present invention;
The structural representation of Fig. 2, the little needle stand of the present invention;
Fig. 3, the present invention be the assembled construction sketch map in syringe.
The specific embodiment
Shown in Fig. 1-3, a kind of hermetically-sealed construction of disposible safety syringe needle stand comprises big needle stand 1 and the little needle stand 2 that is equipped with in big needle stand.
The endoporus of said big needle stand 1 is divided on the minor diameter hole section 12 under hole section 11 and the major diameter; Upper and lower hole section 11, form a step 13 between 12; Stepped portions convexes with an annular projection 131 down, and certain annular projection 131 distortion allowance is outwardly left in the gap 121 between annular projection 131 and the following hole section 12 after being connected with syringe 3 heads.
The profile of said little needle stand 2 is divided into minor diameter epimere 21 and major diameter hypomere 22; The middle and upper part of its medium-small diameter epimere 21 divide 211 with last hole section 11 matched in clearance of big needle stand, the lower part 212 of minor diameter epimere 21 be set as up-small and down-big and with said annular projection 131 interference fit the cone-shaped structure.
Said upper and lower section 21,22 junction form a boss 23 and offset with annular projection 131 bottoms.
When assembling, little needle stand 2 is inserted in the big needle stand 1, at this from the bottom up; When the cone-shaped structure of little needle stand minor diameter epimere 21 lower parts 212 snaps in annular projection 131 endoporus positions; Because of both are relations of interference fit, along with little needle stand 2 further on move, it is big that the diameter of cone-shaped structure further becomes; This will force annular projection 131 dilatating and deformable outwardly gradually; This process offsets with annular projection 131 bottoms up to upper and lower section 21 of little needle stand 2 profile, 22 junction boss 23, and at this moment, little needle stand 2 bottoms snap in the elasticity support claw 31 in the syringe 3 head endoporus and realize stop bit.
At this,, make the inner hole surface of annular projection 131 all cover basically on the conical surface of little needle stand 2 cone-shaped structures because of having reset response power after annular projection 131 distortion; Both large-area contacts have been realized; Guaranteed effective sealing that big needle stand is connected with little needle stand, simultaneously, because of above reset response power is vertically to act on the conical surface; Total makes a concerted effort downwards; The effect of making a concerted effort forces little needle stand 2 from annular projection 131 parts, to eject downwards the moment, and this is equivalent to excite the excitation power that provides extra to the retraction of little needle stand 2, in case break away from little needle stand 2 bottoms and the syringe elasticity support claw 31; Will under the dual function of core bar inner spring and above annular projection 131 restoring forces, bounce back rapidly, the phenomenon of fundamentally having stopped little needle stand 2 retraction stimulation failure takes place.
To sum up, the present invention has further simplified the structure of big needle stand 1 endoporus and little needle stand 2 profiles under the prerequisite that guarantees effectively sealing, has made things convenient for processing and assembling, the generation of also fundamentally having stopped little needle stand 2 stimulation failure phenomenons simultaneously.
Claims (1)
1. the hermetically-sealed construction of a disposible safety syringe needle stand; Comprise big needle stand and the little needle stand that is equipped with in big needle stand; It is characterized in that: the endoporus of said big needle stand is divided on the minor diameter hole section under the hole section and major diameter; Form a step between the section of upper and lower hole, stepped portions convexes with an annular projection down, and certain annular projection distortion allowance is outwardly left in the gap between annular projection and the following hole section after being connected with the syringe head; The profile of said little needle stand is divided into minor diameter epimere and major diameter hypomere; The middle and upper part of its medium-small diameter epimere is divided with the intersegmental crack, last hole of needle stand greatly and is cooperated, the lower part of minor diameter epimere be set as up-small and down-big and with said annular projection interference fit the cone-shaped structure; Said upper and lower section junction forms a boss and the annular projection bottom offsets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203789374U CN202236683U (en) | 2011-10-09 | 2011-10-09 | Sealing structure for deposable safe injector needle stand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203789374U CN202236683U (en) | 2011-10-09 | 2011-10-09 | Sealing structure for deposable safe injector needle stand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202236683U true CN202236683U (en) | 2012-05-30 |
Family
ID=46097997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203789374U Expired - Lifetime CN202236683U (en) | 2011-10-09 | 2011-10-09 | Sealing structure for deposable safe injector needle stand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202236683U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553029A (en) * | 2011-10-09 | 2012-07-11 | 李慧慧 | Sealing structure of disposable safe syringe needle seat |
-
2011
- 2011-10-09 CN CN2011203789374U patent/CN202236683U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553029A (en) * | 2011-10-09 | 2012-07-11 | 李慧慧 | Sealing structure of disposable safe syringe needle seat |
| CN102553029B (en) * | 2011-10-09 | 2013-06-26 | 李慧慧 | Sealing structure of disposable safe syringe needle seat |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120530 Effective date of abandoning: 20130626 |
|
| RGAV | Abandon patent right to avoid regrant |