CN110680603B - Precise injector for ophthalmology department - Google Patents
Precise injector for ophthalmology department Download PDFInfo
- Publication number
- CN110680603B CN110680603B CN201911066456.7A CN201911066456A CN110680603B CN 110680603 B CN110680603 B CN 110680603B CN 201911066456 A CN201911066456 A CN 201911066456A CN 110680603 B CN110680603 B CN 110680603B
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- China
- Prior art keywords
- core rod
- section
- dovetail
- outer sleeve
- rod
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/0008—Introducing ophthalmic products into the ocular cavity or retaining products therein
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
Abstract
The invention discloses an ophthalmological precise injector, which comprises an outer sleeve and a core rod inserted in the outer sleeve, wherein the core rod is divided into two sections, namely a core rod front section and a core rod rear section, and the rear end of the core rod front section is connected with the front end of the core rod rear section through a radial dovetail mortise structure; the radial dovetail mortise structure comprises a shaft rod, a dovetail, a shaft hole matched with the shaft rod and a dovetail groove matched with the dovetail; the front end of the front section of the core rod is provided with an annular bulge, the annular bulge and the core rod are coaxially arranged, and the axial section of the annular bulge is in an arc shape protruding outwards; the rear end of the rear section of the core rod is provided with a press hand used for pushing and pulling the core rod, the rear section of the core rod is provided with a clamping ring, and the clamping ring is arranged close to the press hand. The ophthalmic precision injector has the advantages of good sliding performance and sealing performance, no liquid residue during liquid injection, convenient processing and use, and high safety and reliability.
Description
Technical Field
The invention relates to an ophthalmological precise injector, and belongs to the field of medical instruments.
Background
The disposable injector in the market at present has two kinds of sealing between the core rod and the outer sleeve, wherein the core rod is made of plastic materials and matched with the outer sleeve, and the core rod is provided with or combined with an annular or sheet rubber sealing ring which is injection-molded and matched with the outer sleeve. The former has poor sealing and sliding performance due to the matching of plastics and plastics; the latter is not simple enough in structure and complicated in production process. After the liquid is injected into the syringe, the liquid can be remained in the syringe jacket and the conical head with the two sealing forms, and the low-residue syringe on the market can only reduce the residue but cannot completely eliminate the residue. The ophthalmic injector market requires a simple, residue-free injector.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the ophthalmic precise injector which has the advantages of good sliding performance and sealing performance, no liquid residue during liquid injection, convenience in processing and use, and high safety and reliability.
The technical scheme for realizing the purpose is as follows: an ophthalmological precise quantity injector comprises an outer sleeve and a core rod inserted in the outer sleeve, and is characterized in that the core rod is divided into two sections, namely a core rod front section and a core rod rear section, and the rear end of the core rod front section is connected with the front end of the core rod rear section through a radial dovetail groove structure;
the radial dovetail mortise structure comprises a shaft rod, a dovetail, a shaft hole matched with the shaft rod and a dovetail groove matched with the dovetail; the shaft rod is arranged at the rear end of the front section of the core rod, and the diameter of the shaft rod is smaller than that of the core rod; the dovetail joint is arranged at the rear end of the shaft rod, and the dovetail direction of the dovetail joint is parallel to the radial direction of the core rod; the shaft hole and the dovetail groove are arranged at the front end of the rear section of the core rod in tandem, and the dovetail groove penetrates through the rear section of the core rod from the radial direction; the dovetail joint is clamped in the dovetail groove, and the shaft lever is inserted in the shaft hole;
the front end of the front section of the core rod is provided with an annular bulge, the annular bulge and the core rod are coaxially arranged, and the axial section of the annular bulge is in an arc shape protruding outwards;
a press hand used for pushing and pulling the core bar is arranged at the rear end of the rear section of the core bar, a clamping ring is arranged on the rear section of the core bar, and the clamping ring is arranged close to the press hand;
the front end of the outer sleeve is provided with a conical head, and the rear end of the outer sleeve is provided with a turned edge;
the core bar is inserted into the outer sleeve, the retainer ring and the press hand are positioned outside the outer sleeve, and the annular bulge is connected with the inner wall surface of the outer sleeve in an interference fit manner;
and when the core rod is pushed forwards until the clamping ring is contacted with the crimping edge, the injection is stopped, and the front part of the annular protrusion extends out of the outer sleeve.
According to the ophthalmic precise injector, two dovetail angles of the dovetail joint are respectively cut to form a chamfer, and the outer surface of the chamfer is flush with the outer surface of the core rod.
In the above ophthalmic precise injector, the front section of the core rod is made of thermoplastic polyurethane elastomer rubber, and the rear section of the core rod is made of acrylonitrile-butadiene-styrene plastic.
In the above ophthalmological precise quantity injector, the core rod is molded by injection twice, the core rod rear section is molded by injection first, and then the core rod front section is molded by injection.
The ophthalmic precise injector is characterized in that the inner diameter of the outer sleeve is the same as the inner diameter of the conical head.
The ophthalmic precise injector is characterized in that the distance from the retainer ring to the front end face of the core rod is 1-3 mm greater than the length of the outer sleeve.
The above ophthalmic precise injector, wherein the outer diameter of the collar is larger than the diameter of the core rod, and the diameter of the button is larger than the outer diameter of the collar.
In the ophthalmological precise quantity injector, the axial section of the annular bulge is in an outward convex arc shape, and the length of the arc bottom of the arc is more than or equal to 1.5 mm; the arc line of the arc is composed of two sections of elliptical arcs which are arranged in tandem, and the length of the elliptical arc at the front side is smaller than that at the rear side; the connecting point of the two sections of elliptical arcs is the point with the maximum vector height on the arc.
In the ophthalmic precise injector, the front end surface of the front section of the core rod is conical, and the cone angle is more than or equal to 120 degrees.
The ophthalmic precision injector has good sliding performance and sealing performance, and no liquid residue is left when liquid is injected. The processing and the use are convenient, and the safety and the reliability are high; has the advantages of simple structure, convenient processing and low cost, can realize that no liquid medicine residue exists in the needle cylinder after injection, and can reduce the liquid medicine residue in the connected injection needle seat or the joint.
Drawings
FIG. 1 is a block diagram of an ophthalmic precision injector of the present invention;
FIG. 2 is a front view of a core pin of the ophthalmic precision injector of the present invention;
FIG. 3 is a schematic connection diagram of a front section of the core rod and a rear section of the core rod;
FIG. 4 is a diagram showing the separation of the front section and the rear section of the core rod;
FIG. 5 is a schematic view of the dovetail after cutting at the dovetail angle of the dovetail;
FIG. 6 is a vertical cross-sectional view of the core pin of the ophthalmic precision injector of the present invention;
FIG. 7 is a partial enlarged view of portion A of FIG. 6;
FIG. 8 is a partial enlarged view of portion B of FIG. 6;
fig. 9 is a front view of the housing of the ophthalmic precision injector of the present invention;
FIG. 10 is a cross-sectional view taken along line D-D of FIG. 9;
fig. 11 is a top view of an ophthalmic precision injector of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description is given with reference to the accompanying drawings:
referring to fig. 1 to 11, in the preferred embodiment of the present invention, an ophthalmological precise quantity injector comprises an outer sleeve 1 and a core rod 2 inserted therein, wherein the core rod 2 is divided into two sections, namely a core rod front section 21 and a core rod rear section 22, and the rear end of the core rod front section 21 is connected with the front end of the core rod rear section 22 through a radial dovetail groove structure 3.
Referring to fig. 3 and 4, the radial dovetail groove structure 3 includes a shaft 31, a dovetail 32, a shaft hole 33 engaged with the shaft, and a dovetail groove 34 engaged with the dovetail; the shaft rod 31 is arranged at the rear end of the front section 21 of the core bar, and the diameter of the shaft rod 31 is smaller than that of the core bar 2; the dovetail 32 is arranged at the rear end of the shaft rod 31, and the dovetail direction of the dovetail 32 is parallel to the radial direction of the core rod 2; the shaft hole 33 and the dovetail groove 34 are arranged at the front end of the core rod rear section 22 in tandem; the dovetail groove 34 penetrates through the core rod rear section 22 from the radial direction, the dovetail 32 is clamped in the dovetail groove 34, and the shaft rod 31 is inserted in the shaft hole 33.
Referring to FIG. 5, as a variation, the two dovetail corners of the dovetail 32 are cut to form chamfers 35, and the outer surfaces of the chamfers 35 are flush with the outer surface of the core rod 2.
The front end of the front core rod section 21 is provided with an annular bulge 211, and the annular bulge 211 is coaxial with the core rod 2; the rear end of the core rod rear section 22 is provided with a press hand 222 for pushing and pulling the core rod, the core rod rear section 22 is provided with a clamping ring 221, and the clamping ring 221 is arranged close to the press hand 222.
Referring to fig. 8, the axial section of the annular protrusion 211 is an outwardly convex arc, and the length of the arc bottom of the arc is greater than or equal to 1.5 mm; the arc line of the arc is composed of two sections of elliptical arcs which are arranged in tandem, and the arc length of the elliptical arc a on the front side is smaller than that of the elliptical arc b on the rear side; and the connecting point e of the two sections of elliptical arcs is the point with the maximum arc rise.
Referring to fig. 9, 10 and 11, the front end of the outer sleeve 1 is provided with a conical head 11, and the rear end is provided with a curled edge 12; the cone head 11 is a locking or non-locking cone joint, and the inner diameter of the outer sleeve is the same as that of the cone head without considering draft angle.
Referring to fig. 1, the core rod 2 is inserted into the outer sleeve 1, the collar 221 and the pressing hand 222 are located outside the outer sleeve 1, and the annular protrusion 211 is connected with the inner wall surface of the outer sleeve 1 in an interference fit manner to play a sealing role; the annular protrusion 211 can continuously slide along the inner wall of the outer sleeve and the inner wall of the conical head. The injection is stopped by pushing the core rod 2 forward until the collar 221 comes into contact with the bead 12, and the front part of the annular projection 211 now protrudes outside the outer jacket 1. The front end surface of the front core rod section 21 is conical, and the cone angle is more than or equal to 120 degrees.
The front core rod section 21 is made of thermoplastic polyurethane elastomer rubber, and the material of the shaft rod 31 and the two dovetails 32 thereon is the same as that of the front core rod section 21. The core rod rear section 22 is made of acrylonitrile-butadiene-styrene plastic. The front core rod section 21 and the rear core rod section 22 are made of different materials and are processed into a whole. The core rod 2 is formed by secondary injection molding, the core rod rear section 22 is firstly injected, then the core rod rear section 22 is placed in a mold, and then the core rod front section 21 is injected. The core rod front section 21 and the core rod rear section 22 are connected together through the radial dovetail groove structure 3, and the connection is firm.
The distance from the collar 221 to the front end face of the core rod 2 is 1.5mm greater than the length of the outer jacket 1, and this structure allows the front portion of the annular projection 211 to protrude beyond the conical head 11 when the core rod 2 is pushed to a stop along the inner wall of the outer jacket 1. The outer diameter of the collar 221 is larger than the diameter of the core rod 2, and the collar 221 plays a limiting role and prevents the core rod 2 from further moving after the front part of the annular protrusion 211 pushes out the conical head 11. The length of the front section 21 of the core rod, excluding the shaft lever and the dovetail joint, is 9-15 mm. The diameter of the pressing hand 222 is larger than the outer diameter of the clamping ring 221, so that the pushing and pulling are convenient.
According to the ophthalmic precise injector, the annular bulge 211 is connected with the inner wall surface of the outer sleeve 1 in an interference fit manner to play a sealing role, and in use, the annular bulge 211 can push out an inner hole of a conical head along the inner wall of the outer sleeve 1 through the conical head 11, so that no liquid residue is completely left in the injector, and the liquid residue in a needle seat or a female joint connected with the conical head 11 is reduced; the front section 21 of the core rod and the outer sleeve 1 form sealing, so that the processing is convenient; the matching surface is few, and the reliability is high.
According to the ophthalmological precise injector disclosed by the invention, the front section of the core rod and the rear section of the core rod are made of different materials, and the connecting structure of the front section of the core rod and the rear section of the core rod is a radial tongue-and-groove structure, so that the ophthalmological precise injector has the advantages of simple structure, convenience in processing, low cost and high reliability. When the injection is finished, a part of the annular bulge of the core rod is pushed out of the outer sleeve, so that no liquid residue is left after the injection.
In conclusion, the ophthalmic precise injector has the advantages of simple structure, convenience in processing and low cost, can realize that no liquid medicine residue exists in a needle cylinder after injection, and can reduce the liquid medicine residue in an injection needle seat or a joint connected with the needle cylinder.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (3)
1. An ophthalmological precise quantity injector comprises an outer sleeve and a core rod inserted in the outer sleeve, and is characterized in that the core rod is divided into two sections, namely a core rod front section and a core rod rear section, and the rear end of the core rod front section is connected with the front end of the core rod rear section through a radial dovetail groove structure;
the radial dovetail mortise structure comprises a shaft rod, a dovetail, a shaft hole matched with the shaft rod and a dovetail groove matched with the dovetail; the shaft rod is arranged at the rear end of the front section of the core rod, and the diameter of the shaft rod is smaller than that of the core rod; the dovetail joint is arranged at the rear end of the shaft rod, and the dovetail direction of the dovetail joint is parallel to the radial direction of the core rod; the shaft hole and the dovetail groove are arranged at the front end of the rear section of the core rod in tandem, and the dovetail groove penetrates through the rear section of the core rod from the radial direction; the dovetail joint is clamped in the dovetail groove, and the shaft lever is inserted in the shaft hole;
the front end of the front section of the core rod is provided with an annular bulge, the annular bulge and the core rod are coaxially arranged, and the axial section of the annular bulge is in an arc shape protruding outwards;
a press hand used for pushing and pulling the core bar is arranged at the rear end of the rear section of the core bar, a clamping ring is arranged on the rear section of the core bar, and the clamping ring is arranged close to the press hand;
the front end of the outer sleeve is provided with a conical head, and the rear end of the outer sleeve is provided with a turned edge;
the core bar is inserted into the outer sleeve, the retainer ring and the press hand are positioned outside the outer sleeve, and the annular bulge is connected with the inner wall surface of the outer sleeve in an interference fit manner; the annular bulge can push out the inner hole of the conical head along the inner wall of the outer sleeve through the conical head;
when the core rod is pushed forwards until the clamping ring is contacted with the crimping edge, the injection is stopped, and the front part of the annular bulge extends out of the outer sleeve at the moment, so that no liquid is left in the injector completely;
the front section of the core rod is made of thermoplastic polyurethane elastomer rubber, the rear section of the core rod is made of acrylonitrile-butadiene-styrene plastic, and the front section of the core rod and the rear section of the core rod are processed into a whole by adopting different materials; the core bar is molded by secondary injection molding, the rear section of the core bar is firstly injected, and then the rear section of the core bar is placed in a mold and then the front section of the core bar is injected;
the front section of the core rod and the outer sleeve form sealing;
two dovetail angles of the dovetail joint are respectively cut to form a chamfer, and the outer surface of the chamfer is flush with the outer surface of the core rod;
the inner diameter of the outer sleeve is the same as that of the conical head;
the distance from the clamping ring to the front end face of the core rod is 1 mm-3 mm larger than the length of the outer sleeve;
the axial section of the annular bulge is in an outwards-protruded arc shape, and the length of the arc bottom of the arc is more than or equal to 1.5 mm; the arc line of the arc is composed of two sections of elliptical arcs which are arranged in tandem, and the length of the elliptical arc at the front side is smaller than that at the rear side; the connecting point of the two sections of elliptical arcs is the point with the maximum vector height on the arc.
2. The ophthalmic precision injector of claim 1, wherein the collar has an outer diameter greater than the diameter of the stem and the knob has a diameter greater than the outer diameter of the collar.
3. The ophthalmic precise injector according to claim 1, wherein the front end surface of the front section of the core rod is conical, and the taper angle is not less than 120 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066456.7A CN110680603B (en) | 2019-11-04 | 2019-11-04 | Precise injector for ophthalmology department |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066456.7A CN110680603B (en) | 2019-11-04 | 2019-11-04 | Precise injector for ophthalmology department |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110680603A CN110680603A (en) | 2020-01-14 |
| CN110680603B true CN110680603B (en) | 2022-05-13 |
Family
ID=69115478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911066456.7A Active CN110680603B (en) | 2019-11-04 | 2019-11-04 | Precise injector for ophthalmology department |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110680603B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2507470Y (en) * | 2001-09-15 | 2002-08-28 | 吴金昌 | Residueless self-destroying expendable injector |
| CN1552470A (en) * | 2003-12-18 | 2004-12-08 | 陈嘉农 | Self-locking and self-destruction safety syringe |
| ES2424124T3 (en) * | 2010-10-01 | 2013-09-27 | Geistlich Pharma Ag | Device for the application of bone substitute material |
| CN202015392U (en) * | 2010-12-15 | 2011-10-26 | 成都市新津事丰医疗器械有限公司 | Disposable syringe and core rod |
| CN203525086U (en) * | 2013-10-08 | 2014-04-09 | 苏州市雅思精密模具有限公司 | Residue-free puncture-resistant injector |
| CN103638580A (en) * | 2013-12-21 | 2014-03-19 | 山东中保康医疗器具有限公司 | Medical injector with novel piston |
| CN204170219U (en) * | 2014-10-09 | 2015-02-25 | 安徽省天康医疗用品有限公司 | A kind of highly-effective low-residue self-destruction syringe |
| CN204307157U (en) * | 2014-11-18 | 2015-05-06 | 深圳市安特高科实业有限公司 | Piston component and syringe |
| CN204766869U (en) * | 2015-05-19 | 2015-11-18 | 宁波市合坤工业设计有限公司 | Safe practical syringe |
| CN206660197U (en) * | 2016-12-20 | 2017-11-24 | 成都青山利康药业有限公司 | A kind of syringe for CRRT |
| CN107349491A (en) * | 2017-07-06 | 2017-11-17 | 丽水市知科科技有限公司 | A kind of accurate fixed-quantity injector |
-
2019
- 2019-11-04 CN CN201911066456.7A patent/CN110680603B/en active Active
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| Publication number | Publication date |
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| CN110680603A (en) | 2020-01-14 |
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