CN110755197B - Zero-residue injector for ophthalmology - Google Patents
Zero-residue injector for ophthalmology Download PDFInfo
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- CN110755197B CN110755197B CN201911066361.5A CN201911066361A CN110755197B CN 110755197 B CN110755197 B CN 110755197B CN 201911066361 A CN201911066361 A CN 201911066361A CN 110755197 B CN110755197 B CN 110755197B
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- Prior art keywords
- core rod
- section
- outer sleeve
- residue
- core
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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
-
- 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
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Surgery (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses an ophthalmological zero-residue 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 T-shaped tongue-and-groove structure; the T-shaped 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 triangular; the rear end of the rear section of the core rod is provided with a press hand 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 zero-residue ophthalmic injector 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.
Description
Technical Field
The invention relates to an ophthalmic zero-residue 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 an ophthalmic zero-residue 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 zero-residue injector 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 T-shaped tongue-and-groove structure;
the T-shaped mortise structure comprises a T-shaped tenon and a T-shaped hole matched with the T-shaped tenon, the vertical part of the T-shaped tenon is arranged at the rear end of the front section of the core rod, and the direction of the transverse part of the T-shaped tenon is parallel to the radial direction of the core rod; the T-shaped hole is formed in the front end of the rear section of the core rod, and the transverse part of the T-shaped hole penetrates through the rear section of the core rod from the radial direction; the T-shaped tenon is clamped in the T-shaped 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 triangular;
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.
In the zero-residue injector for ophthalmology, 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 zero-residue injector for ophthalmology, the core rod is molded by injection twice, the rear section of the core rod is firstly molded by injection, and then the front section of the core rod is molded by injection.
The zero-residue ophthalmic syringe comprises a casing, a conical head and a sleeve, wherein the conical head is arranged on the casing, and the conical head is arranged on the conical head.
In the zero-residue ophthalmic syringe, the distance from the collar to the front end face of the core rod is 1mm to 3mm greater than the length of the outer sleeve.
An ophthalmic zero-residue syringe as described above, wherein the collar has an outer diameter greater than the diameter of the plunger and the diameter of the button is greater than the outer diameter of the collar.
In the zero-residue ophthalmic injector, the axial section of the annular protrusion is triangular, one side of the triangle is attached to the outer wall surface of the core rod to form a contact side, and the length of the contact side is greater than or equal to 1.5 mm; the angle of the front end on the contact edge is 75-90 degrees, and the angle of the rear end is less than or equal to 10 degrees.
The zero-residue ophthalmic injector has good sliding performance and sealing performance, and no liquid residue is generated during liquid injection. 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 zero residue syringe of the present invention;
FIG. 2 is a front view of the core rod of the ophthalmic zero residue syringe of the present invention;
FIG. 3 is a schematic connection diagram of a front core rod section and a rear core rod section;
FIG. 4 is a diagram showing the separation of the front section and the rear section of the core rod;
FIG. 5 is a vertical cross-sectional view of the core rod of the ophthalmic zero residue syringe of the present invention;
FIG. 6 is a partial enlarged view of portion A of FIG. 5;
FIG. 7 is a cross-sectional view taken along line C-C of FIG. 6;
FIG. 8 is a partial enlarged view of portion B of FIG. 5;
FIG. 9 is a front view of the outer casing of the ophthalmic zero residue syringe 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 zero residue syringe 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 a preferred embodiment of the present invention, an ophthalmic zero-residue syringe 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 and the front end of the core rod rear section 22 are connected together by a T-shaped tongue-and-groove structure 3.
Referring to fig. 3 and 4, the T-shaped mortise structure 3 includes a T-shaped tenon 31 and a T-shaped hole 32 matched with the T-shaped tenon, a vertical portion of the T-shaped tenon 31 is disposed at a rear end of the core rod front section 21, and a direction of a transverse portion of the T-shaped tenon 31 is parallel to a radial direction of the core rod 2; the T-shaped hole 32 is formed in the front end of the core rod rear section 22, and the transverse part of the T-shaped hole 32 penetrates through the core rod rear section from the radial direction; the T-shaped tenon 31 is snapped in the T-shaped hole 32.
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 triangular, and one side of the triangle is attached to the outer wall surface of the core rod 2 to form a contact side, and the length of the contact side a is greater than or equal to 1.5 mm; the angle b of the front end on the contact edge is 75-90 degrees, and the angle e of the rear end is less than or equal to 10 degrees.
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, the inner diameter of the outer sleeve being the same as the inner diameter of the cone head, irrespective of 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 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 front core rod section 21 and the rear core rod section 22 are connected together through the T-shaped mortise structure 3 and are firmly connected.
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 zero-residue ophthalmic 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.
The zero-residue injector for ophthalmology of the invention has the advantages of simple structure, convenient processing, low cost and high reliability, wherein 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 of a T-shaped tongue-and-groove structure. 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 zero-residue ophthalmic 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 (4)
1. An ophthalmological zero-residue 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 T-shaped tongue-and-groove structure;
the T-shaped mortise structure comprises a T-shaped tenon and a T-shaped hole matched with the T-shaped tenon, the vertical part of the T-shaped tenon is arranged at the rear end of the front section of the core rod, and the direction of the transverse part of the T-shaped tenon is parallel to the radial direction of the core rod; the T-shaped hole is formed in the front end of the rear section of the core rod, and the transverse part of the T-shaped hole penetrates through the rear section of the core rod from the radial direction; the T-shaped tenon is clamped in the T-shaped 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 triangular;
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 clamping ring and the press hand are positioned outside the outer sleeve, the annular bulge is in interference fit connection with the inner wall surface of the outer sleeve, and the annular bulge can be pushed out of the inner hole of the conical head through the conical head along the inner wall of the outer sleeve;
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, and the rear section of the core rod is made of acrylonitrile-butadiene-styrene plastic; the front section of the core rod and the rear section of the core rod are integrally processed 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;
the axial section of the annular bulge is triangular, one side of the triangle is attached to the outer wall surface of the core rod to form a contact side, and the length of the contact side is more than or equal to 1.5 mm; the angle of the front end on the contact edge is 75-90 degrees, and the angle of the rear end is less than or equal to 10 degrees.
2. An ophthalmic zero-residue syringe according to claim 1, wherein the inner diameter of the outer sleeve is the same as the inner diameter of the conical head.
3. An ophthalmic zero-residue syringe according to claim 1, wherein the distance from the collar to the front face of the core rod is 1mm to 3mm greater than the length of the outer sheath.
4. An ophthalmic zero-residue syringe according to claim 1, wherein the collar has an outer diameter greater than the diameter of the plunger and the knob has a diameter greater than the outer diameter of the collar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066361.5A CN110755197B (en) | 2019-11-04 | 2019-11-04 | Zero-residue injector for ophthalmology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066361.5A CN110755197B (en) | 2019-11-04 | 2019-11-04 | Zero-residue injector for ophthalmology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110755197A CN110755197A (en) | 2020-02-07 |
| CN110755197B true CN110755197B (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911066361.5A Active CN110755197B (en) | 2019-11-04 | 2019-11-04 | Zero-residue injector for ophthalmology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110755197B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2792339B2 (en) * | 1992-05-18 | 1998-09-03 | 株式会社ニッショー | Anti-reuse syringe |
| CN2172656Y (en) * | 1993-07-17 | 1994-07-27 | 招远市医疗器械厂 | Once-used sterile syringe |
| CN1552470A (en) * | 2003-12-18 | 2004-12-08 | 陈嘉农 | Self-locking and self-destruction safety syringe |
| US8491592B2 (en) * | 2010-10-01 | 2013-07-23 | Geistlich Pharma Ag | Device for the application of bone substitute material |
| EP3326674B1 (en) * | 2011-03-28 | 2020-08-19 | Becton, Dickinson and Company | Plastic stopper |
| US20130123712A1 (en) * | 2011-11-11 | 2013-05-16 | Becton, Dickinson And Company | Plunger Rod Retaining Anchors |
| 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 |
| CN107714103B (en) * | 2017-10-27 | 2024-06-04 | 北京市春立正达医疗器械股份有限公司 | Injection syringe |
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2019
- 2019-11-04 CN CN201911066361.5A patent/CN110755197B/en active Active
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| Publication number | Publication date |
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| CN110755197A (en) | 2020-02-07 |
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