CN110680996B - Full-residue-discharging type syringe - Google Patents
Full-residue-discharging type syringe Download PDFInfo
- Publication number
- CN110680996B CN110680996B CN201911065853.2A CN201911065853A CN110680996B CN 110680996 B CN110680996 B CN 110680996B CN 201911065853 A CN201911065853 A CN 201911065853A CN 110680996 B CN110680996 B CN 110680996B
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- China
- Prior art keywords
- core rod
- outer sleeve
- section
- dovetail
- core
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
Abstract
The invention discloses a full-row residual syringe, 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 double-dovetail mortise structure; the radial double-dovetail-tenon groove structure comprises a shaft rod, two dovetail joints, a shaft hole matched with the shaft rod and dovetail grooves matched with the two dovetail joints; the front end of the front section of the core rod is provided with an annular bulge which is coaxial with the core rod; 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 full-row-residue type 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 a full-residue-discharge type injector, belonging 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. There is a need in the market today for a syringe that is simple in construction and free of residue.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a full-row-residue type 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: a full-row residual syringe 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 double-dovetail mortise structure;
the radial double-dovetail-groove structure comprises a shaft rod, two dovetails, a shaft hole matched with the shaft rod and dovetail grooves matched with the two dovetails; 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 two dovetail joints are symmetrically arranged on the outer wall surface of the rear half part of the shaft rod, and the dovetail direction of each 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 shaft hole is connected with the dovetail groove to form an inverted T-shaped structure; the dovetail groove penetrates through the rear section of the core rod from the radial direction; the two dovetail joints are clamped in the dovetail grooves, and the front half part of 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, and the annular bulge and the core rod are coaxially arranged;
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 rod is inserted into the outer sleeve, the clamping ring and the press hand are positioned outside the outer sleeve, and the annular bulge is in interference fit connection with the inner wall surface of the outer sleeve;
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 above full-row-residue 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 full-row residual syringe, the core rod is formed by injection molding twice, the rear section of the core rod is firstly injection molded, and then the front section of the core rod is injection molded.
The full-discharge residual syringe is characterized in that the inner diameter of the outer sleeve is the same as that of the conical head.
The full-row residual syringe is characterized in that the distance from the retainer ring to the front end face of the core rod is 1-4 mm greater than the length of the outer sleeve.
A full row residual syringe as above, wherein the collar has an outer diameter greater than the diameter of the core rod, and the knob has a diameter greater than the outer diameter of the collar.
The axial section of the annular bulge is in a trapezoid shape with a narrow outer part and a wide inner part, and the length of the long edge in the trapezoid is more than or equal to 1.5mm; and the bottom angle of the front end of the trapezoid is 75-90 degrees, and the bottom angle of the rear end is less than or equal to 10 degrees.
The full-row residue type 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 is left 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 a full row residual syringe of the present invention;
FIG. 2 is a front view of the core rod of the full row residual syringe 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 vertical cross-sectional view of the core rod of the full row residual syringe of the present invention;
FIG. 6 is a partial enlarged view of portion A of FIG. 5;
FIG. 7 is a partial enlarged view of portion B of FIG. 5;
FIG. 8 is a front view of the outer sleeve of the full row residual syringe of the present invention;
FIG. 9 is a cross-sectional view taken along line D-D of FIG. 8;
fig. 10 is a top view of a full row residual 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 10, in the preferred embodiment of the present invention, a full-length residual syringe comprises an outer sleeve 1 and a core rod 2 inserted therein, the core rod 2 is divided into two sections, i.e. 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 radial double dovetail mortise structure 3.
Referring to fig. 3 and 4, the radial double-dovetail groove structure 3 includes a shaft 31, two dovetails 32, a shaft hole 33 engaged with the shaft, and dovetail grooves 34 engaged with the two dovetails; 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 two dovetail joints 32 are symmetrically arranged on the outer wall surface of the rear half part of the shaft lever 31, and the dovetail direction of each dovetail joint 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 shaft hole 33 is communicated with the dovetail groove 34, and the shaft hole 33 is connected with the dovetail groove 34 to form an inverted T-shaped structure; the dovetail groove 34 penetrates the core rod rear section 22 from the radial direction, the two dovetails 32 are clamped in the dovetail groove 34, and the front half part of the shaft rod 31 is inserted in the shaft hole 33.
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, 9 and 10, 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 again, the core rod 2 is inserted into the outer sleeve 1, the collar 221 and the knob 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 perform a sealing function; 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 core rod front section 21 is made of thermoplastic polyurethane elastomer rubber, and the materials of the shaft lever 31 and the two dovetails 32 thereon are the same as those of the core rod front section 21. The core rod rear section 22 is made of acrylonitrile-butadiene-styrene plastic. The core rod front section 21 and the core rod rear section 22 are integrally processed by adopting different materials. 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 radial double-dovetail 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 sleeve 1, and this structure allows the front portion of the annular protrusion 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 sleeve 1. The outer diameter of the clamping ring 221 is larger than the diameter of the core rod 2, and the clamping ring 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 core rod front section 21 excluding the shaft lever and the dovetail joint is 9 mm-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.
Referring to fig. 7, the axial section of the annular protrusion 211 is a trapezoid with a narrow outside and a wide inside, and the length of the long side a inside the trapezoid is greater than or equal to 1.5mm. And the bottom angle of the trapezoid close to the front end of the core rod is 75-90 degrees, and the bottom angle close to the rear end of the core rod is less than or equal to 10 degrees.
According to the full-row-residue 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 full-row residual injector disclosed by the invention has the advantages that 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 radial tongue-and-groove structure, so that the full-row residual injector has the advantages of simple structure, convenience in processing, low cost and high reliability. By pushing a part of the annular protrusion 211 of the core rod out of the outer sleeve at the completion of the injection, it is achieved that no liquid remains at all after the injection.
In conclusion, the full-row residual syringe has the advantages of simple structure, convenience in processing and low cost, can completely prevent residual liquid medicine in a syringe after injection, and can reduce residual liquid medicine in an injection needle seat or a joint connected with the syringe.
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. A full-row residual syringe 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 double-dovetail mortise structure;
the radial double-dovetail-groove structure comprises a shaft rod, two dovetails, a shaft hole matched with the shaft rod and dovetail grooves matched with the two dovetails; 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 two dovetail joints are symmetrically arranged on the outer wall surface of the rear half part of the shaft rod, and the dovetail direction of each 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 shaft hole is connected with the dovetail groove to form an inverted T-shaped structure; the dovetail groove penetrates through the rear section of the core rod from the radial direction; the two dovetail joints are clamped in the dovetail grooves, and the front half part of 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, and the annular bulge and the core rod are coaxially arranged;
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, 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 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;
the axial section of the annular bulge is in a trapezoid with a narrow outside and a wide inside, and the length of the long edge in the trapezoid is more than or equal to 1.5mm; and the base angle of the front end of the trapezoid is 75-90 degrees, and the base angle of the rear end is less than or equal to 10 degrees.
2. A full row residual syringe according to claim 1, wherein the inner diameter of said outer sleeve is the same as the inner diameter of said conical head.
3. A full row residual syringe according to claim 1, wherein the distance from the collar to the front end face of the core rod is 1mm to 4mm greater than the length of the outer sleeve.
4. A full displacement residual syringe as claimed in 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 |
|---|---|---|---|
| CN201911065853.2A CN110680996B (en) | 2019-11-04 | 2019-11-04 | Full-residue-discharging type syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065853.2A CN110680996B (en) | 2019-11-04 | 2019-11-04 | Full-residue-discharging type syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110680996A CN110680996A (en) | 2020-01-14 |
| CN110680996B true CN110680996B (en) | 2022-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911065853.2A Active CN110680996B (en) | 2019-11-04 | 2019-11-04 | Full-residue-discharging type syringe |
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| Country | Link |
|---|---|
| CN (1) | CN110680996B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172656Y (en) * | 1993-07-17 | 1994-07-27 | 招远市医疗器械厂 | Once-used sterile syringe |
| JP2792339B2 (en) * | 1992-05-18 | 1998-09-03 | 株式会社ニッショー | Anti-reuse syringe |
| CN101041094A (en) * | 2006-03-23 | 2007-09-26 | 许明正 | Injector able to reduce quantity of the rest medicine liquid |
| CN201481919U (en) * | 2009-04-29 | 2010-05-26 | 王振有 | Non-residual self-destruction type disposable syringe |
| EP2436342B1 (en) * | 2010-10-01 | 2013-05-08 | Geistlich Pharma AG | Device for the application of bone substitute material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1552470A (en) * | 2003-12-18 | 2004-12-08 | 陈嘉农 | Self-locking and self-destruction safety syringe |
| CN101979108B (en) * | 2010-09-09 | 2012-07-04 | 上海双鸽实业有限公司 | Insulin 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 |
-
2019
- 2019-11-04 CN CN201911065853.2A patent/CN110680996B/en active Active
Patent Citations (5)
| 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 |
| CN101041094A (en) * | 2006-03-23 | 2007-09-26 | 许明正 | Injector able to reduce quantity of the rest medicine liquid |
| CN201481919U (en) * | 2009-04-29 | 2010-05-26 | 王振有 | Non-residual self-destruction type disposable syringe |
| EP2436342B1 (en) * | 2010-10-01 | 2013-05-08 | Geistlich Pharma AG | Device for the application of bone substitute material |
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| Publication number | Publication date |
|---|---|
| CN110680996A (en) | 2020-01-14 |
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