CN106964030B - Piston device for syringe - Google Patents
Piston device for syringe Download PDFInfo
- Publication number
- CN106964030B CN106964030B CN201710257841.4A CN201710257841A CN106964030B CN 106964030 B CN106964030 B CN 106964030B CN 201710257841 A CN201710257841 A CN 201710257841A CN 106964030 B CN106964030 B CN 106964030B
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- China
- Prior art keywords
- piston base
- hollow
- piston
- base body
- injector
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Classifications
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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
- 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
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
-
- 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
- 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
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M5/31513—Piston constructions to improve sealing or sliding
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- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a piston device for an injector, which comprises a piston and a piston base, wherein the piston base comprises: the piston base comprises a piston base body connected with a push rod of the injector and a piston base cover detachably connected with the piston base body; the piston base body is internally provided with an accommodating space. The piston base is split, when the injector works, pressure or pulling force applied by a push rod of the injector is completely borne by the piston base body, and the piston base cover cannot directly bear external force applied by the push rod of the injector, so that the strength of the force borne by the piston base is improved, the piston base cover is prevented from being inclined or deformed due to the fact that the piston base cover cannot bear the pressure applied by the push rod of the injector, meanwhile, the accommodating space can reduce or even eliminate the internal stress of the piston base body, and the piston base body is prevented from being contracted in the injection molding and cooling process; the first supporting column plays a supporting role in the accommodating space, and the strength of the piston base body is increased.
Description
Technical Field
The invention relates to the technical field of syringes, in particular to a piston device for a syringe.
Background
In the prior art, an injector for medical equipment is mainly composed of a syringe 100, a piston 200 and a piston base 300. The piston base 300 is usually formed by plastic injection molding, and the size of the piston base is controlled to be matched with that of the piston 200, so that the piston 200 is ensured to be well matched with the inner cylinder of the needle cylinder 100, and liquid leakage is prevented; the cylinder 100 is caught on the chucking head 400 to restrict its axial position and to be concentric with the push rod 500. The piston base 300 is sleeved on the push rod 500. The push rod 500 moves back and forth to drive the piston 200 to move in the cylindrical inner cavity of the syringe 100; and liquid suction, air exhaust and injection are realized. In the high pressure syringe product, to 200mL cylinder commonly used, the maximum thrust of push rod can reach 4700N, current piston base is integrative and sets up, and be solid, when the surface of piston base cools off earlier, its inside material has not cooled off, in the cooling process afterwards, the material that piston base surface has cooled off will be drawn inwards, lead to forming a pit on the surface of piston base, piston base can produce the internal stress simultaneously, lead to its self to shrink, finally make piston base warp, the piston produces the skew, the demonstration of injection volume and injection pressure also can be inaccurate, thereby can cause the injection failure, cause the injury for the patient.
Accordingly, there is a need for improvements and developments in the art.
Disclosure of Invention
The present invention provides a piston device for an injector, which aims to solve the problem that the piston base in the prior art is a solid whole and is easy to shrink and deform, resulting in piston deflection.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a piston device for a syringe comprising a piston and a piston base, wherein the piston base comprises: the piston base comprises a piston base body connected with a push rod of the injector and a piston base cover detachably connected with the piston base body; an accommodating space is formed in the piston base body, and a first support column is arranged in the accommodating space; when the piston base body is positioned in a needle cylinder of the injector, the central axis of the first support column coincides with the central axis of the injector.
The piston base body comprises a top cover opposite to a push rod of the injector, a hollow cylinder connected with the top cover, a hollow circular truncated cone connected with the hollow cylinder, and a bottom cover connected with the hollow circular truncated cone; the wall thickness of the hollow cylinder is equal; the outer diameter of the bottom cover is smaller than the inner diameter of the hollow cylinder.
The piston device for the syringe is characterized in that a plurality of first hollow parts are arranged on the hollow circular truncated cone at intervals; the first hollow-out part is contacted with the bottom cover.
The piston device for the syringe, wherein the first hollowed-out part is fan-shaped.
The piston device for the syringe is characterized in that a plurality of second hollow parts are arranged on the hollow circular truncated cone at intervals; the distance between the second hollow-out part and the hollow cylinder is equal to the distance between the second hollow-out part and the first hollow-out part.
The piston device for the injector is characterized in that the sum of central angles of two adjacent second hollow-out parts is equal to the central angle of the first hollow-out part.
The piston device for the syringe is characterized in that a plurality of second supporting columns are symmetrically arranged in the accommodating space by taking the first supporting column as a central line.
The piston device for the syringe, wherein the second support column is parallel to the first support column; one end of the second supporting column is positioned between the first hollow-out part and the second hollow-out part; the other end is positioned on the top cover.
The piston device for the injector is characterized in that the distance between two adjacent second hollowed-out parts is equal to the thickness of the second supporting column.
The piston device for the injector is characterized in that the distance between two adjacent first hollow parts is equal to the thickness of the second supporting column.
Has the advantages that: the piston base is split, when imbibing, exhausting and injecting, the pressure or pulling force exerted by the push rod of the injector is completely borne by the piston base body, and the piston base cover can not directly bear the external force exerted by the push rod of the injector, so that the strength of the force borne by the piston base is improved, and the phenomenon that the piston base cover can not bear the pressure exerted by the push rod of the injector to generate deflection or deformation when imbibing, exhausting and injecting is avoided. When the piston base is contacted with liquid, the accommodating space can effectively reduce or even eliminate the internal stress of the piston base body, and the piston base body is prevented from shrinking in the cooling process; first support column is in play supporting role in the accommodation space, when carrying out imbibition, exhaust, injection, first support column is located the central axis of the push rod of syringe to it is right to accept the push rod of syringe the external force that piston base body applyed increases piston base body's intensity, and avoids piston base body produces under the push rod effort of syringe crooked.
Drawings
FIG. 1 is a partial cross-sectional view of a prior art syringe;
FIG. 2 is a cross-sectional view of the piston base of the present invention;
FIG. 3 is a schematic view of the piston base body of the present invention;
FIG. 4 isbase:Sub>A cross-sectional view A-A of the piston base body of FIG. 3;
FIG. 5 is a right side view of the piston base body of FIG. 3;
fig. 6 is a left side view of the piston base body of fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 2-6. The invention provides a piston device for a syringe, which comprises a piston and a piston base, wherein the piston is made of rubber, and the rubber has good wear resistance, elasticity and lubricity and can effectively prevent liquid leakage in the injection process of the syringe. Wherein, as shown in fig. 2, the piston base includes: the piston base comprises a piston base body connected with a push rod of the injector and a piston base cover 1 detachably connected with the piston base body; the piston base body is internally provided with an accommodating space 2.
The piston base is composed of a piston base body and a piston base cover 1, namely the piston base is split, when liquid suction, exhaust and injection are carried out, pressure or pulling force applied by a push rod of the injector is completely borne by the piston base body, and the piston base cover 1 cannot directly bear external force applied by the push rod of the injector, so that the strength of the force borne by the piston base is improved, and the phenomenon that the piston base cover 1 is inclined or deformed due to the pressure applied by the push rod of the injector when the piston base cover 1 cannot bear the liquid suction, exhaust and injection is avoided. Set up accommodation space 2 in the piston base body, make piston base body is inside to be hollow, works as during piston base contact liquid, accommodation space 2 can effectual reduction or even eliminate piston base body's internal stress, and avoid piston base body produces the shrink in the cooling process.
Further, as shown in fig. 2, a first support column 3 is arranged in the accommodating space 2; when the piston base body is positioned in a needle cylinder of the injector, the central axis of the first support column 3 is coincided with the central axis of the injector, and then the central axis of the first support column 3 is also coincided with the central axis of a push rod of the injector. Because this internal accommodation space 2 that is provided with of piston base, first support column 3 is in play the supporting role in the accommodation space 2, when carrying out imbibition, exhaust, injection, first support column 3 is located the central axis of the push rod of syringe to it is right to accept the push rod of syringe the external force that piston base body applyed increases piston base body's intensity, and avoids piston base body produces under the push rod effort of syringe crooked.
As shown in fig. 3, the piston base body comprises a top cover 4 opposite to a push rod of the injector, a hollow cylinder 5 connected with the top cover 4, a hollow circular truncated cone 6 connected with the hollow cylinder 5, and a bottom cover 7 connected with the hollow circular truncated cone 6; the wall thickness of the hollow cylinder 5 is equal; the inner diameter of the hollow cylinder 5 is larger than the outer diameter of the bottom cover 7. Preferably, the thickness of the top cover 4 is equal to the wall thickness of the hollow cylinder 5. The first support column 3 is positioned on the central axis of the piston base body; the top cover 4 is perpendicular to the first support column 3; the top cover 4 is symmetrically provided with two clamping hooks 8 by taking the first supporting column 3 as a center; the clamping hook 8 is used for connecting the top cover 4 with a push rod of the injector. The hook 8 comprises a cylinder 81 and a hook body 82 which are integrally arranged; wherein, the plane (B plane) of the bottom surfaces of the two hook bodies is parallel to the top cover 4. Because the wall thickness that is located the hollow round platform 6 of the central axis both sides of piston base body is impartial, is located the 5 wall thicknesses of the hollow cylinder of the central axis both sides of piston base body are impartial, make piston base body atress is even, when carrying out imbibition, exhaust, injection, top cap 4 remains parallel with the B plane throughout, and perpendicular to throughout the central axis of piston base body avoids piston base body produces crooked in the use.
As shown in fig. 2 and 4, a first annular protrusion 51 is provided on the outer wall of the hollow cylinder 5, and a first gap is provided between the first annular protrusion 51 and the hollow circular truncated cone 6, and the first gap is used for accommodating the piston base cover 1; the piston base cover 1 has elasticity, and the piston base cover 1 is reversely buckled on the piston base body; when the piston base cover 1 is connected to the piston base body in a matching manner, the piston base cover 1 is elastically deformed and contacts the first annular protrusion 51.
As shown in fig. 4, a second annular protrusion 52 is further disposed on the outer wall of the hollow cylinder 5, and a second gap is formed between the second annular protrusion 52 and the first annular protrusion 51. The second gap is used for accommodating the piston and ensuring that the piston is in good size fit with the inner wall of the needle cylinder of the injector when the piston is in fit connection with the piston base, so that liquid leakage is prevented.
The piston base is made of plastic and is formed through dispensing and injection molding. As shown in fig. 4 and 5, a circular groove 41 is formed in the center of the top cover 4, and the piston base is injected with glue through the circular groove 41, so that the surface of the top cover 4 is prevented from being inclined due to contraction of the piston base body when glue is fed, the piston base body is not perpendicular to the central axis of the piston base body any more, and meanwhile, the piston base body is more uniformly stressed.
As shown in fig. 6, a plurality of first hollow parts 61 are arranged on the hollow circular truncated cone 6 at intervals; the first hollow part 61 is in contact with the bottom cover 7; the first hollow part 61 is fan-shaped; the number of the first hollow-out portions 61 is 6, and the central angle of each first hollow-out portion 61 is 60 °.
As shown in fig. 6, a plurality of second hollow portions 62 are arranged on the hollow circular truncated cone 6 at intervals; the sum of the central angles of two adjacent second hollow-out portions 62 is equal to the central angle of the first hollow-out portion 61. The number of the second hollow-out portions 62 is 12, the number of the 2 second hollow-out portions is one group, and each group of the second hollow-out portions is opposite to one first hollow-out portion. The distance between the second hollow part 62 and the hollow cylinder 5 is equal to the distance between the second hollow part 62 and the first hollow part 61, so that the hollow round table 6 is further prevented from being deformed due to shrinkage when the hollow round table 6 is subjected to glue injection, and the hollow round table 6 is uniformly stressed. The hollow round table is provided with a first hollow part and a second hollow part, so that raw materials of the hollow round table are reduced as much as possible on the premise that the bearing capacity of the hollow round table is not reduced, and the weight of the hollow round table is reduced, so that the piston base can reciprocate in the needle cylinder.
As shown in fig. 4, a plurality of second support columns 9 are symmetrically arranged in the accommodating space 2 with the first support column 3 as a center line; the second support column 9 is parallel to the first support column 3. One end of the second supporting column 9 is located between the first hollow part 61 and the second hollow part 62; the other end is positioned on the top cover 4. First support column 3 is right bottom 7 with support between the top cap 4, the second support column is right hollow round platform 6 with support between the top cap 4, just first support column 3 with second support column 9 all sets up along the axial direction of the push rod of syringe to the assurance has accommodation space 2 the piston base body keeps steady when receiving the push rod effort of syringe, top cap 4 remains throughout mutually perpendicular with the central axis of the push rod of syringe, thereby avoids the piston takes place to be crooked.
The distance between two adjacent second hollow parts is equal to the diameter of the second supporting column 9, the distance between two adjacent first hollow parts is equal to the diameter of the second supporting column 9, and the diameter of the second supporting column 9 is equal to 2/3 of the wall thickness of the hollow cylinder 5, so that the piston base body is prevented from shrinking during glue injection molding.
In summary, the present invention provides a piston device for a syringe, which includes a piston and a piston base, wherein the piston base includes: the piston base comprises a piston base body connected with a push rod of the injector and a piston base cover detachably connected with the piston base body; the piston base body is internally provided with an accommodating space. The piston base is split, when imbibing, exhausting and injecting, the pressure or pulling force exerted by the push rod of the injector is completely borne by the piston base body, and the piston base cover can not directly bear the external force exerted by the push rod of the injector, so that the strength of the force borne by the piston base is improved, and the phenomenon that the piston base cover can not bear the pressure exerted by the push rod of the injector to generate deflection or deformation when imbibing, exhausting and injecting is avoided. When the piston base is contacted with liquid, the accommodating space can effectively reduce or even eliminate the internal stress of the piston base body and avoid the piston base body from shrinking in the cooling process; first support column is in play the supporting role in the accommodation space, when carrying out imbibition, exhaust, injection, first support column is located the central axis of the push rod of syringe to it is right to accept the push rod of syringe the external force that piston base body applyed increases piston base body's intensity, and avoids piston base body produces under the push rod effort of syringe crooked.
It will be understood that the invention is not limited to the examples described above, but that modifications and variations will occur to those skilled in the art in light of the above teachings, and that all such modifications and variations are considered to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. Piston device for a syringe, comprising a piston and a piston base, characterized in that said piston base comprises: the piston base comprises a piston base body connected with a push rod of the injector and a piston base cover detachably connected with the piston base body; an accommodating space is formed in the piston base body, and a first support column is arranged in the accommodating space; when the piston base body is positioned in a needle cylinder of the injector, the central axis of the first support column is superposed with the central axis of the injector;
the piston base body comprises a top cover opposite to a push rod of the injector, a hollow cylinder connected with the top cover, a hollow circular truncated cone connected with the hollow cylinder, and a bottom cover connected with the hollow circular truncated cone; a first annular bulge is arranged on the outer wall of the hollow cylinder, a first gap is formed between the first annular bulge and the hollow circular truncated cone, and the first gap is used for accommodating the piston base cover; the piston base cover has elasticity, and is reversely buckled on the piston base body and is in contact with the first annular bulge;
the piston base is made of plastic and is formed by dispensing and injection molding; a circular groove is formed in the center of the top cover, so that glue is injected into the piston base through the circular groove;
a plurality of first hollow parts are arranged on the hollow round table at intervals; the first hollow part is in contact with the bottom cover; a plurality of second hollow parts are arranged on the hollow round table at intervals; the distance between the second hollow part and the hollow cylinder is equal to the distance between the second hollow part and the first hollow part; a plurality of second supporting columns are symmetrically arranged in the accommodating space by taking the first supporting column as a central line; the second support column is parallel to the first support column; one end of the second supporting column is positioned between the first hollow-out part and the second hollow-out part, and the other end of the second supporting column is positioned on the top cover; the diameter of the second support column is equal to 2/3 of the wall thickness of the hollow cylinder.
2. The piston device for syringe as set forth in claim 1, wherein said hollow cylinders have an equal wall thickness; the outer diameter of the bottom cover is smaller than the inner diameter of the hollow cylinder.
3. The piston device for syringe as set forth in claim 1, wherein said first hollow portion has a fan shape.
4. The piston device for a syringe as set forth in claim 3, wherein the sum of central angles of two adjacent second hollows is equal to the central angle of the first hollows.
5. The piston device for syringe as set forth in claim 1, wherein the distance between two adjacent second hollows is equal to the thickness of the second supporting column.
6. The piston device for syringe as set forth in claim 1, wherein the distance between two adjacent first hollows is equal to the thickness of the second supporting column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257841.4A CN106964030B (en) | 2017-04-19 | 2017-04-19 | Piston device for syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257841.4A CN106964030B (en) | 2017-04-19 | 2017-04-19 | Piston device for syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106964030A CN106964030A (en) | 2017-07-21 |
| CN106964030B true CN106964030B (en) | 2023-04-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710257841.4A Active CN106964030B (en) | 2017-04-19 | 2017-04-19 | Piston device for syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106964030B (en) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5090962A (en) * | 1989-04-28 | 1992-02-25 | Flp Enterprises, Inc. | Non-reusable syringe |
| US9308316B1 (en) * | 1997-07-18 | 2016-04-12 | Liebel-Flarsheim Company Llc | Adapter and syringe for front-loading medical fluid injector |
| CN2328376Y (en) * | 1998-05-20 | 1999-07-14 | 蔡纪发 | Rubber piston for injector |
| CN2394646Y (en) * | 1999-09-27 | 2000-09-06 | 山东省威海医用高分子制品一厂 | Rubber plastic piston of syringe |
| US20010018575A1 (en) * | 1999-10-19 | 2001-08-30 | Lyza Henry Walter | Injector syringe |
| CN1676170B (en) * | 2000-07-22 | 2010-09-08 | 株式会社费森尤斯卡比 | Liquid supply apparatus |
| US6585700B1 (en) * | 2000-10-05 | 2003-07-01 | Medrad, Inc. | Syringe, syringe plunger and attachment mechanism for front loading medical injector |
| US7553294B2 (en) * | 2002-05-30 | 2009-06-30 | Medrad, Inc. | Syringe plunger sensing mechanism for a medical injector |
| CN2708918Y (en) * | 2004-05-12 | 2005-07-13 | 威海威高创新有限公司 | Rubber plastic piston of injector |
| US8926569B2 (en) * | 2006-03-15 | 2015-01-06 | Bayer Medical Care Inc. | Plunger covers and plungers for use in syringes and methods of fabricating plunger covers and plungers for use in syringes |
| DE202008017724U1 (en) * | 2008-08-02 | 2010-05-27 | Meddrop Technology Ag | syringe |
| US20100280370A1 (en) * | 2009-03-26 | 2010-11-04 | Namey Jr David | Syringe plunger |
| PL2768551T3 (en) * | 2011-10-19 | 2018-01-31 | Medtron Ag | Syringe for a high pressure injector |
| US9623191B2 (en) * | 2013-03-01 | 2017-04-18 | Bayer Healthcare Llc | Information sensing syringe |
| CN204468900U (en) * | 2015-03-17 | 2015-07-15 | 钟鼎苏 | A kind of high pressure injector cylinder piston and high pressure injector syringe |
-
2017
- 2017-04-19 CN CN201710257841.4A patent/CN106964030B/en active Active
Also Published As
| Publication number | Publication date |
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| CN106964030A (en) | 2017-07-21 |
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