CN106621026B - Non-return needle connector - Google Patents
Non-return needle connector Download PDFInfo
- Publication number
- CN106621026B CN106621026B CN201611242720.4A CN201611242720A CN106621026B CN 106621026 B CN106621026 B CN 106621026B CN 201611242720 A CN201611242720 A CN 201611242720A CN 106621026 B CN106621026 B CN 106621026B
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- CN
- China
- Prior art keywords
- way
- self
- flow guide
- drainage
- locking
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M39/12—Tube connectors; Tube couplings for joining a flexible tube to a rigid attachment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
Abstract
The invention provides a non-return needle connector which comprises a drainage two-way (5), a flow guide two-way (8), a return spring (2) and a self-locking thimble (1), wherein a support (3) is fixedly connected in the inner cavity of the drainage two-way (5), and a drainage through hole (31) is formed in the support (3); the drainage two-way (5) is connected with the flow guide two-way (8) in a sealing way, the self-locking thimble (1) is movably connected with the flow guide two-way (8), and the reset spring (2) is arranged between the self-locking thimble (1) and the support (3); when the self-locking thimble is pushed open, the flow guide two-way and the flow guide two-way are mutually communicated, and after the self-locking thimble is released, the self-locking thimble resets under the action of the reset spring and forms a sealing structure with the flow guide two-way. The self-locking type liquid backflow prevention device is applied to a fluid pipeline, forms a self-locking type sealing structure through the matching of the return spring and the self-locking ejector pin to prevent liquid backflow, and has the outstanding advantages of simple structure, reliable backflow prevention, convenience in operation and the like.
Description
Technical Field
The invention relates to the technical field of needle connectors, in particular to a non-return needle connector.
Background
In the production of medical devices that are intended to be used in conjunction with a needle, medical device products such as syringes, blood collectors, etc., in some cases require replacement of the needle attached to the syringe or other medical consumables (e.g., infusion lines, blood lines, etc.). However, if only the needle is pulled out, not only the needle and the consumable contact surface connected with the needle are exposed to air, but also the liquid in the consumable product connected with the needle may flow out, thereby causing a pollution risk and bringing a potential safety hazard to the needle and the consumable product connected with the needle.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to solve the problems in the prior art, a non-return needle connector with a simple structure is provided, which can effectively prevent the liquid in a pipeline from flowing back even if a needle is pulled off when the non-return needle connector is applied to the liquid pipeline.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: a non-return needle connector comprises a drainage two-way, a flow guide two-way, a return spring and a self-locking thimble, wherein a support is fixedly connected in an inner cavity of the drainage two-way, and a drainage through hole is formed in the support; the drainage two-way and the flow guide two-way are connected in a sealing way, the self-locking thimble and the flow guide two-way are movably connected, and a reset spring is arranged between the self-locking thimble and the support; when the self-locking thimble is pushed open, the flow guide two-way and the flow guide two-way are mutually communicated, and after the self-locking thimble is released, the self-locking thimble resets under the action of the reset spring and forms a sealing structure with the flow guide two-way.
Preferably, the drainage two-way and the flow guide two-way are in interference fit to form sealing connection.
Preferably, the drainage cock and the flow guide cock are in sealing connection in a threaded connection mode.
Preferably, a sealing ring is arranged at the connecting part between the two drainage channels and the two flow guide channels.
Preferably, the self-locking thimble is in a T-shaped structure, and a relatively small section of the self-locking thimble penetrates through the flow guide two-way.
Preferably, the tail end of the relatively small section of the self-locking thimble is provided with a groove.
Preferably, the support is in a T-shaped structure, and a relatively small section of the support and the return spring form a sleeving structure.
Preferably, the drainage cock is fixedly connected with a holding handle.
Preferably, a pipeline confluence part with a conical structure is formed in the drainage two-way cavity.
Compared with the prior art, the invention has the beneficial effects that: when the self-locking thimble connector is applied to a fluid pipeline, a drainage two-way in the non-return type needle connector is communicated with the fluid pipeline, a flow guide two-way is connected with a needle head, the self-locking thimble is pushed by the needle head to enable the reset spring to generate elastic deformation, and after the self-locking thimble is pushed away, the flow guide two-way and the drainage two-way are communicated with each other, so that fluid can flow through the needle head; after the needle head is pulled down, the self-locking thimble is released and is reset under the action of the reset spring, and a sealing structure is formed between the self-locking thimble and the flow guide two-way, so that liquid flowing out of the flow guide two-way can be effectively prevented from flowing back into the flow guide two-way. Therefore, the non-return needle connector provided by the invention forms a self-locking sealing structure by matching the return spring and the self-locking thimble to prevent liquid from flowing back, and has the advantages of simple structure, reliable backflow prevention, convenience in operation and easiness in production.
Drawings
Fig. 1 is a schematic structural diagram of a non-return needle connector of the present invention.
The labels in the figure are: the self-locking type self-locking device comprises a self-locking ejector pin 1, a reset spring 2, a support 3, a holding handle 4, a drainage two-way, a sealing ring 6, a containing cavity 7, a flow guide two-way, a groove 11, a drainage through hole 31, a pipeline connecting part 51 and a pipeline converging part 52.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The non-return needle connector shown in fig. 1 mainly comprises a self-locking thimble 1, a return spring 2, a drainage two-way 5 and a flow guide two-way 8, wherein a support 3 is fixedly connected in an inner cavity of the drainage two-way 5, and a drainage through hole 31 is formed in the support 3; preferably, the support 3 and the drainage cock 5 are of an integrally molded structure. The drainage two-way 5 is connected with the flow guide two-way 8 in a sealing way, and an accommodating cavity 7 is formed at the connecting part between the drainage two-way 5 and the flow guide two-way 8. Preferably, the drainage two-way 5 and the flow guide two-way 8 form a sealing connection in an interference fit manner, or the drainage two-way 5 and the flow guide two-way 8 form a sealing connection in a threaded connection manner, or the drainage two-way 5 and the flow guide two-way 8 form a sealing connection in an adhesion manner. In order to ensure the sealing reliability of the connection part between the two drainage channels 5 and the two guide channels 8, a sealing ring 6 can be arranged at the connection part between the two drainage channels 5 and the two guide channels 8.
The self-locking thimble 1 and the flow guide two-way valve 8 are movably connected, a reset spring 2 is arranged between the self-locking thimble 1 and the support 3, the reset spring 2 is also positioned in the accommodating cavity 7, and after the self-locking thimble 1 is pushed away by force, the self-locking thimble 1 moves towards the direction close to the flow guide two-way valve 5 relative to the flow guide two-way valve 8 by force, in the process, the self-locking thimble 1 continuously compresses the reset spring 2, and meanwhile, the flow guide two-way valve 8 and the flow guide two-way valve 5 are in a mutual conduction state; after the external force is cancelled, namely the self-locking thimble 1 is released, the self-locking thimble 1 is reset under the action of the reset spring 2, and a sealing structure is formed between the self-locking thimble 1 and the flow guide two-way valve 8.
When the non-return needle connector is applied to a fluid pipeline, the drainage two-way 5 is communicated with the fluid pipeline through the pipeline connecting part 51 on the drainage two-way, and the guide two-way 8 is connected with a needle. In order to facilitate the connection operation of the drainage two-way 5 and the fluid pipeline, a holding handle 4 can be fixedly connected to the drainage two-way 5. Preferably, the holding handle 4 and the drainage two-way 5 can adopt an integrated molding structure, so that the connection is reliable, and the production cost is saved.
In the connection process of the two-way flow guide 8 and the needle head, the needle head enables the self-locking thimble 1 to move towards the direction close to the two-way flow guide 5 relative to the two-way flow guide 8 under the pushing action of external force, the self-locking thimble 1 compresses the return spring 2 until the two-way flow guide 8 and the two-way flow guide 5 are in a mutual conduction state, so that fluid such as liquid or blood in a fluid pipeline can sequentially pass through the flow guide through hole 31, the accommodating cavity 7 and the two-way flow guide 8 on the support 3 and finally flows out from the needle head. Usually, after the needle head is connected in place, the locking force between the needle head and the two diversion passages 8 is greater than the elastic force of the return spring 2, so that the needle head can prop against the rebound of the self-locking thimble 1, and the two diversion passages 8 and the two diversion passages 5 are ensured to be in a mutual conduction state. After the needle head is pulled off, the external force on the self-locking thimble 1 is removed, so that the self-locking thimble 1 is reset under the action of the reset spring 2 until the self-locking thimble 1 and the flow guide two-way valve 8 are restored to a sealing state, and the liquid flowing out of the flow guide two-way valve 8 can be effectively prevented from flowing back to the flow guide two-way valve 5.
In order to improve the anti-backflow reliability of the non-return needle connector, the self-locking thimble 1 may be designed to be a T-shaped structure, wherein a relatively small section of the self-locking thimble penetrates through the flow guide two-way 8, and a relatively large end of the self-locking thimble and the flow guide two-way 8 form a sealing state. In addition, the support 3 also adopts a T-shaped structure, and a relatively small section of the T-shaped structure and the return spring 2 form a sleeving structure. Preferably, the support 3 and the drainage cock 5 can adopt an integrated molding structure, so that the connection is reliable, and the production cost is saved.
As shown in fig. 1, a groove 11 may be formed at the end of a relatively small section of the self-locking thimble 1, and the groove 11 preferably adopts a tapered groove. Through setting up recess 11, not only can guarantee that the contact between syringe needle and the auto-lock thimble 1 is reliable, can also make the fluid that flows to the syringe needle from water conservancy diversion bi-pass 8 produce certain buffering in recess 11 department to make the fluid that flows out the syringe needle flow out more evenly. In addition, a pipeline confluence part 52 with a conical structure can be formed in the inner cavity of the drainage two-way 5, so that the fluid in the fluid pipeline can enter the inner cavity of the drainage two-way 5 at an accelerated speed and passes through the drainage through hole 31 on the support 3 at an accelerated speed to improve the fluid pressure at two ends of the accommodating cavity 7, so that the fluid in the accommodating cavity 7 can quickly flow into the inner cavity of the drainage two-way 8, and the backflow of the liquid is better prevented.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A non-return needle connector is characterized in that: the self-locking drainage device comprises a drainage two-way (5), a flow guide two-way (8), a return spring (2) and a self-locking thimble (1), wherein a groove (11) is formed in the tail end of the self-locking thimble (1), a support (3) is fixedly connected in an inner cavity of the drainage two-way (5), and a drainage through hole (31) is formed in the support (3); the drainage two-way (5) is connected with the flow guide two-way (8) in a sealing way, the self-locking thimble (1) is movably connected with the flow guide two-way (8), and a return spring (2) is arranged between the self-locking thimble (1) and the support (3); when the self-locking thimble (1) is pushed away, the flow guide two-way (8) and the flow guide two-way (5) are mutually communicated; after the self-locking thimble (1) is released, the self-locking thimble (1) resets under the action of the reset spring (2) and forms a sealing structure with the flow guide bi-pass (8), and the groove (11) at the tail end of the self-locking thimble (1) is exposed out of the flow guide bi-pass (8).
2. The non-return needle connector of claim 1, wherein: the drainage two-way (5) and the flow guide two-way (8) form sealing connection in an interference fit mode.
3. The non-return needle connector of claim 1, wherein: the drainage two-way (5) and the flow guide two-way (8) are in sealing connection in a threaded connection mode.
4. The non-return needle connector as claimed in any one of claims 1-3, wherein: and a sealing ring (6) is arranged at the connecting part between the drainage two-way (5) and the flow guide two-way (8).
5. The non-return needle connector as claimed in any one of claims 1-3, wherein: the self-locking thimble (1) is in a T-shaped structure, and a relatively small section of the self-locking thimble penetrates through the flow guide two-way (8).
6. The non-return needle connector as claimed in any one of claims 1-3, wherein: the support (3) is of a T-shaped structure, and a relatively small section of the support and the return spring (2) form a sleeving structure.
7. The non-return needle connector as claimed in any one of claims 1-3, wherein: the drainage two-way (5) is fixedly connected with a holding handle (4).
8. The non-return needle connector as claimed in any one of claims 1-3, wherein: a pipeline confluence part (52) with a conical structure is formed in the inner cavity of the drainage two-way (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611242720.4A CN106621026B (en) | 2016-12-29 | 2016-12-29 | Non-return needle connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611242720.4A CN106621026B (en) | 2016-12-29 | 2016-12-29 | Non-return needle connector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106621026A CN106621026A (en) | 2017-05-10 |
| CN106621026B true CN106621026B (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611242720.4A Active CN106621026B (en) | 2016-12-29 | 2016-12-29 | Non-return needle connector |
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| Country | Link |
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| CN (1) | CN106621026B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108413082B (en) * | 2018-04-08 | 2020-01-14 | 哈尔滨工业大学 | Quick connector of micro-fluidic system |
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| CN201008703Y (en) * | 2007-03-13 | 2008-01-23 | 上海林华医疗器械有限公司 | Positive pressure type coupling assembly |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106621026A (en) | 2017-05-10 |
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