CN210009459U - Liquid outlet filtering injector - Google Patents
Liquid outlet filtering injector Download PDFInfo
- Publication number
- CN210009459U CN210009459U CN201822114085.2U CN201822114085U CN210009459U CN 210009459 U CN210009459 U CN 210009459U CN 201822114085 U CN201822114085 U CN 201822114085U CN 210009459 U CN210009459 U CN 210009459U
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- China
- Prior art keywords
- connecting piece
- needle
- annular surface
- seat
- way valve
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- 238000001914 filtration Methods 0.000 title claims abstract description 38
- 239000007788 liquid Substances 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims 8
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000003814 drug Substances 0.000 description 13
- 230000009471 action Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005213 imbibition Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 208000001297 phlebitis Diseases 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model provides a liquid outlet filtering injector, which comprises an injector and an injection needle head, wherein a lower needle seat comprises a conical cavity, a lower needle seat annular surface and a lower needle seat outer cylinder body, and a plurality of grooves are uniformly distributed on the upper circumference of the lower needle seat annular surface; the connecting piece comprises a connecting piece outer cylinder, a connecting piece annular surface and a connecting piece inner cylinder, and a plurality of connecting piece through holes are uniformly distributed on the connecting piece annular surface at the circumference; go up the needle file and include the outer barrel of last needle file, go up needle file frustum and steel needle fixing base, the lateral wall of the outer barrel of connecting piece and the inside wall interference fit of the outer barrel of lower needle file and the inside wall of the outer barrel of last needle file, the setting of check valve disk is between the barrel in needle file annular face and the connecting piece down, the mobilizable barrel that inserts in the connecting piece of check valve guide post, annular filtration membrane sets up the downside at the connecting piece annular face, the upside of connecting piece annular face is equipped with annular last check valve. The beneficial effects of the utility model are that one-way filtration, the security is high.
Description
Technical Field
The utility model belongs to the field of medical equipment, especially, relate to a play liquid filters syringe.
Background
As is known, most of the currently used injections are packaged in glass bottles, and when a rubber plug is pricked by a needle of a syringe or a glass bottle is cut by a grinding wheel to extract liquid medicine, bottle stopper scraps or glass powder can enter the injection. The conventional syringe does not have a filtering function, and when liquid medicine is extracted, the impurities are extracted into the syringe and directly injected into a patient, so that diseases such as phlebitis and the like are induced.
The filtering syringe with the patent number of CN103721321A is unreasonable in structural design of the check valve, when liquid is extracted into the syringe, a channel in the middle of the check valve is opened due to the extrusion of negative pressure, the liquid medicine can enter the syringe without being filtered from the middle channel of the check valve, the risk of incomplete filtering exists, the original structure is filtering when the liquid medicine is extracted, and the risk of re-injecting the impurities which are filtered before when the liquid medicine is injected exists.
Disclosure of Invention
The utility model aims at providing a play liquid filtration syringe of simple structure, security height.
The technical scheme of the utility model is that:
the liquid outlet filtering injector comprises an injector and an injection needle head, wherein the injection needle head comprises a lower needle seat, a lower one-way valve, a filtering membrane, a connecting piece, an upper one-way valve, an upper needle seat and a steel needle fixed on the upper needle seat; the connecting piece comprises a connecting piece outer cylinder, a connecting piece annular surface and a connecting piece inner cylinder, wherein the excircle of the connecting piece annular surface is vertically connected with the connecting piece outer cylinder, the inner circle of the connecting piece annular surface is vertically connected with the connecting piece inner cylinder, and a plurality of connecting piece through holes are uniformly distributed on the circumference of the connecting piece annular surface; the lower one-way valve comprises a lower one-way valve wafer and a lower one-way valve guide column vertically arranged in the middle of the lower one-way valve wafer; the upper needle seat comprises an upper needle seat outer barrel, an upper needle seat frustum and a steel needle fixing seat, a large circle of the upper needle seat frustum is connected with one end of the upper needle seat outer barrel, a small circle of the upper needle seat frustum is connected with the cylindrical steel needle fixing seat, a steel needle is arranged on the steel needle fixing seat, the lower end of the outer side wall of the connecting piece outer barrel is in interference fit with the inner side wall of the lower needle seat outer barrel, the upper end of the outer side wall of the connecting piece outer barrel is in interference fit with the inner side wall of the upper needle seat outer barrel, a lower one-way valve wafer is arranged between the lower needle seat annular surface and the connecting piece inner barrel, a lower one-way valve guide column is movably inserted into the connecting piece inner barrel, an annular filtering membrane is arranged on the lower side of the connecting piece annular surface, and an annular upper one-way valve.
The utility model discloses when going out liquid filtration syringe feed liquor, under the pressure effect of imbibition, go up the check valve and close, the check valve disk is hugged closely under on the needle file annular face down, and the liquid medicine enters into the cavity of connecting piece annular face below from the clearance between barrel inside wall and the lower check valve guide post in the connecting piece, then enters into the conical head intracavity through the recess on the needle file annular face down. When liquid is discharged through injection, the lower check valve disc is separated from the annular surface of the lower needle seat under the action of pressure, the lower check valve disc is tightly attached to the lower end of the inner cylinder of the connecting piece, liquid medicine flows upwards through the groove in the annular surface of the lower needle seat, a gap between the upper check valve and the annular surface of the connecting piece is opened through the filtering membrane under the action of pressure, and the filtered liquid medicine is discharged from the steel needle.
The length of the groove is equal to the difference between the outer circle radius and the inner circle radius of the annular surface of the lower needle seat.
In order to facilitate liquid inlet and liquid outlet and reduce the thrust for pushing the push rod, the length of the groove is equal to the difference between the inner circle radius and the outer circle radius of the annular surface of the lower needle seat, so that the liquid medicine can pass through the groove by adopting smaller pressure, and the injection pressure and the liquid inlet pressure are small.
The distance between the inner cylinder body of the connecting piece and the annular surface of the lower needle holder is smaller than the distance between the outer cylinder body of the connecting piece and the annular surface of the lower needle holder.
Namely the height difference between the inner cylinder body of the connecting piece and the outer cylinder body of the connecting piece, can provide a space for the lower one-way valve disc to move up and down.
The diameter of the lower one-way valve disk is larger than the inner diameter of the conical cavity and smaller than the inner diameter of the outer cylinder body of the connecting piece.
The upper end of the outer side wall of the connecting piece inner cylinder body is provided with an annular groove, and the upper check valve is arranged in the annular groove.
Go up the check valve and set up in the annular groove, go up the firm in connection between the barrel in check valve and the connecting piece, when increase injection pressure, the clearance between last individual term valve excircle and the connecting piece annular surface is opened, and can not lead to the whole check valve to drop from the barrel in the connecting piece.
The diameter of the lower one-way valve guide post is smaller than the inner diameter of the cylinder in the connecting piece.
The diameter of the lower end of the through hole of the connecting piece is larger than that of the upper end of the through hole of the connecting piece.
The upper needle base also comprises an annular surface of the upper needle base, the inner circle of the annular surface of the upper needle base is connected with the big circle of the frustum of the upper needle base, and the outer circle of the annular surface of the upper needle base is vertically connected with the outer barrel of the upper needle base.
And positioning ribs are uniformly distributed on the outer side walls of the steel needle fixing seat and the upper needle seat frustum in the circumferential direction.
The utility model has the advantages and positive effects that: by adopting the technical scheme, the liquid inlet of the liquid outlet filtering injector is not filtered, the liquid outlet is filtered in a one-way mode, the filtering pressure is low, the safety is high, and the operation is labor-saving and convenient.
Drawings
FIG. 1 is a schematic structural view of the liquid-discharging filtering injector of the present invention
FIG. 2 is an exploded view of the needle of the liquid-filtering syringe of the present invention
FIG. 3 is a schematic view of the structure of the lower needle seat of the liquid-discharging filtering injector of the present invention
FIG. 4 is a schematic view of the structure of the connection piece of the liquid-discharging filtering syringe of the present invention
FIG. 5 is a schematic view of the liquid inlet state structure of the liquid outlet filtering syringe of the present invention
FIG. 6 is a schematic view of the structure of the liquid-out state of the liquid-out filtering syringe of the present invention
In the figure:
1. the syringe 2, the lower needle seat 3, the lower one-way valve 4 and the filtering membrane
5. Connecting piece 6, upper one-way valve 7, upper needle seat 8 and steel needle
21. Lower needle base outer cylinder 22, conical head cavity 23, lower needle base annular surface 24 and groove
25. A lower needle seat through hole 31, a lower one-way valve guide post 32, a lower one-way valve wafer 51 and a connecting piece outer cylinder
52. Connecting piece inner cylinder 53, connecting piece annular surface 54, connecting piece through hole 71 and upper needle seat outer cylinder
72. An upper needle seat frustum 73, a positioning rib 74, a steel needle fixing seat 75 and an upper needle seat annular surface
Detailed Description
As shown in fig. 1 and 2, the liquid-filtering injector of the present invention comprises an injector 1 and an injection needle, wherein the injection needle comprises a lower needle base 2, a lower check valve 3, a filtering membrane 4, a connecting piece 5, an upper check valve 6, an upper needle base 7 and a steel needle 8 fixed on the upper needle base 7, as shown in fig. 3, the lower needle base 2 comprises a conical cavity 22, a lower needle base annular surface 23 and a lower needle base outer cylinder 21, the conical cavity 22 is connected with the conical head of the injector 1, the inner circle of the lower needle base annular surface 23 is connected with the conical cavity 22, the outer circle of the lower needle base annular surface 23 is vertically connected with the lower needle base outer cylinder 21, and a plurality of grooves 24 are uniformly distributed on the upper circumference of the lower needle base annular surface 23; as shown in fig. 4, the connecting piece 5 comprises a connecting piece outer cylinder 51, a connecting piece annular surface 53 and a connecting piece inner cylinder 52, wherein the outer circle of the connecting piece annular surface 53 is vertically connected with the middle part of the inner side wall of the connecting piece outer cylinder 52, the inner circle of the connecting piece annular surface 53 is vertically connected with the middle part of the outer side wall of the connecting piece inner cylinder 51, and a plurality of connecting piece through holes 54 are uniformly distributed on the upper circumference of the connecting piece annular surface 53; the lower one-way valve 3 comprises a lower one-way valve wafer 32 and a lower one-way valve guide column 31 vertically arranged in the middle of the lower one-way valve wafer 32; the upper needle base 7 comprises an upper needle base outer cylinder 71, an upper needle base frustum 72 and a steel needle fixing seat 74, a large circle of the upper needle base frustum 72 is connected with one end of the upper needle base outer cylinder 71, a small circle of the upper needle base frustum 72 is connected with the cylindrical steel needle fixing seat 74, a steel needle 8 is arranged on the steel needle fixing seat 74, the lower end of the outer side wall of the connecting piece outer cylinder 51 is in interference fit with the inner side wall of the lower needle base outer cylinder 21, the upper end of the outer side wall of the connecting piece outer cylinder 51 is in interference fit with the inner side wall of the upper needle base outer cylinder 71, a lower check valve disc 32 is arranged between the lower needle base annular surface 23 and the connecting piece inner cylinder 52, a lower check valve guide column 31 is movably inserted into the connecting piece inner cylinder 52, an annular filter membrane 4 is arranged on the lower side of the connecting piece annular surface 53, and an annular upper check valve 6 is arranged on the upper.
As shown in fig. 5 and 6, in order to reduce the pressure for suction and injection and to increase the flow path of the liquid medicine, the length of the concave groove 24 is equal to the difference between the outer radius and the inner radius of the lower hub annular surface 23.
The distance between the connector inner barrel 52 and the lower hub annular surface 23 is less than the distance between the connector outer barrel 51 and the lower hub annular surface 23. That is, the lower check valve disc 32 can move up and down in the gap between the inside of the connector below the barrel 52 and the lower hub annular surface 23.
Further, the diameter of the lower check valve disc 32 is larger than the inner diameter of the conical cavity 22 and smaller than the inner diameter of the outer cylinder 51 of the connecting piece.
In order to firmly fix the upper check valve 6 on the connecting piece inner cylinder 52, an annular groove is arranged at the upper end of the outer side wall of the connecting piece inner cylinder 52, and the upper check valve 6 is arranged in the annular groove. Thus, the injection pressure can only open the gap between the outer circumference of the upper check valve 6 and the annular surface 53 of the coupling, without the entire upper check valve 6 falling off the coupling inner cylinder 52.
The diameter of the lower check valve guide post 31 is smaller than the inner diameter of the inner barrel 52 of the coupling.
The diameter of the lower end of the connector through hole 54 is larger than that of the upper end of the connector through hole 54.
The upper needle base 7 further comprises an upper needle base annular surface 75, the inner circle of the upper needle base annular surface 75 is connected with the big circle of the upper needle base frustum 72, and the outer circle of the upper needle base annular surface 75 is vertically connected with the upper needle base outer cylinder 71.
And positioning ribs 73 are uniformly distributed on the outer side walls of the steel needle fixing seat 74 and the upper needle seat frustum 72.
The working process of the example is as follows:
as shown in fig. 5, the utility model discloses when going out liquid filtration syringe feed liquor, under the pressure effect of imbibition, go up check valve 6 and close, needle file annular face 23 is hugged closely down to lower check valve disk 32, and the liquid medicine enters into the cavity of connecting piece annular face 53 below from the clearance between barrel 52 inside wall and the lower check valve guide post 31 in the connecting piece, then through the recess on lower needle file annular face 23, through needle file through-hole 25 down, enters into in conical head chamber 22.
As shown in fig. 6, when the liquid is injected, the lower check valve disc 32 is separated from the lower needle seat annular surface 23 under the action of pressure, the lower check valve disc 32 is tightly attached to the lower end of the connecting piece inner cylinder 52, the liquid medicine flows upwards through the groove 24 on the lower needle seat annular surface 23, passes through the filtering membrane, passes through the connecting piece through hole 54 on the connecting piece annular surface 53 under the action of pressure, the gap between the upper check valve 6 and the connecting piece annular surface 53 is opened, and the filtered liquid medicine is discharged from the steel needle 8.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (9)
1. Go out liquid and filter syringe, including syringe and syringe needle, its characterized in that: the injection needle comprises a lower needle seat, a lower one-way valve, a filtering membrane, a connecting piece, an upper one-way valve, an upper needle seat and a steel needle fixed on the upper needle seat, wherein the lower needle seat comprises a conical head cavity, a lower needle seat annular surface and a lower needle seat outer barrel body; the connecting piece comprises a connecting piece outer cylinder, a connecting piece annular surface and a connecting piece inner cylinder, wherein the excircle of the connecting piece annular surface is vertically connected with the connecting piece outer cylinder, the inner circle of the connecting piece annular surface is vertically connected with the connecting piece inner cylinder, and a plurality of connecting piece through holes are uniformly distributed on the circumference of the connecting piece annular surface; the lower one-way valve comprises a lower one-way valve wafer and a lower one-way valve guide column vertically arranged in the middle of the lower one-way valve wafer; the upper needle seat comprises an upper needle seat outer barrel, an upper needle seat frustum and a steel needle fixing seat, a large circle of the upper needle seat frustum is connected with one end of the upper needle seat outer barrel, a small circle of the upper needle seat frustum is connected with the cylindrical steel needle fixing seat, a steel needle is arranged on the steel needle fixing seat, the lower end of the outer side wall of the connecting piece outer barrel is in interference fit with the inner side wall of the lower needle seat outer barrel, the upper end of the outer side wall of the connecting piece outer barrel is in interference fit with the inner side wall of the upper needle seat outer barrel, a lower one-way valve wafer is arranged between the lower needle seat annular surface and the connecting piece inner barrel, a lower one-way valve guide column is movably inserted into the connecting piece inner barrel, an annular filtering membrane is arranged on the lower side of the connecting piece annular surface, and an annular upper one-way valve.
2. The tapping filtration syringe of claim 1, wherein: the length of the groove is equal to the difference between the outer circle radius and the inner circle radius of the annular surface of the lower needle seat.
3. The tapping filtration syringe of claim 2, wherein: the distance between the inner cylinder body of the connecting piece and the annular surface of the lower needle holder is smaller than the distance between the outer cylinder body of the connecting piece and the annular surface of the lower needle holder.
4. The tapping filtration syringe of any one of claims 1 to 3, characterized in that: the diameter of the lower one-way valve disk is larger than the inner diameter of the conical cavity and smaller than the inner diameter of the outer cylinder body of the connecting piece.
5. The tapping filtration syringe of claim 4, wherein: the upper end of the outer side wall of the connecting piece inner cylinder body is provided with an annular groove, and the upper check valve is arranged in the annular groove.
6. The tapping filtration syringe of claim 5, wherein: the diameter of the lower one-way valve guide post is smaller than the inner diameter of the cylinder in the connecting piece.
7. The tapping filtration syringe of claim 6, wherein: the diameter of the lower end of the through hole of the connecting piece is larger than that of the upper end of the through hole of the connecting piece.
8. The tapping filtration syringe of claim 7, wherein: the upper needle base also comprises an annular surface of the upper needle base, the inner circle of the annular surface of the upper needle base is connected with the big circle of the frustum of the upper needle base, and the outer circle of the annular surface of the upper needle base is vertically connected with the outer barrel of the upper needle base.
9. The tapping filtration syringe of claim 8, wherein: and positioning ribs are uniformly distributed on the outer side walls of the steel needle fixing seat and the upper needle seat frustum in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822114085.2U CN210009459U (en) | 2018-12-17 | 2018-12-17 | Liquid outlet filtering injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822114085.2U CN210009459U (en) | 2018-12-17 | 2018-12-17 | Liquid outlet filtering injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210009459U true CN210009459U (en) | 2020-02-04 |
Family
ID=69311955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822114085.2U Active CN210009459U (en) | 2018-12-17 | 2018-12-17 | Liquid outlet filtering injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210009459U (en) |
-
2018
- 2018-12-17 CN CN201822114085.2U patent/CN210009459U/en active Active
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