CN212383042U - Side-flow type anti-backflow venous indwelling needle - Google Patents
Side-flow type anti-backflow venous indwelling needle Download PDFInfo
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- CN212383042U CN212383042U CN202020230375.8U CN202020230375U CN212383042U CN 212383042 U CN212383042 U CN 212383042U CN 202020230375 U CN202020230375 U CN 202020230375U CN 212383042 U CN212383042 U CN 212383042U
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Abstract
The utility model discloses a side-flow type anti-backflow venous indwelling needle, wherein a sleeve is communicated with a body through a one-way conduction mechanism; the unidirectional flux mechanism includes: the elastic membrane cavity comprises a first cavity and an elastic membrane, two ends of the first cavity are respectively communicated with the sleeve and the body, a communication port of the first cavity and the body is communicated into the sleeve through the first cavity, and the elastic membrane for isolating front and rear openings of the first cavity is arranged in the first cavity; the one-way through cavity is connected with the elastic membrane cavity in parallel, and the conducting direction of the one-way through cavity is from the body to the sleeve. The problem that blood is easy to flow back to a cannula in the process of not carrying out transfusion in the prior art is solved.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a needle is kept somewhere to side flow formula anti-return vein.
Background
The venous indwelling needle is also called as a venous trocar, and the use of the venous indwelling needle can reduce the pain of a patient caused by repeated venipuncture and the fear of injection, is convenient for clinical medication and reduces the workload of clinical nurses. The venous indwelling needle is simple and convenient to operate, is suitable for puncture of any position, and is generally applied clinically. The core component part of the venous indwelling needle comprises a body, wherein the body is hollow, two ends of the body are open, and the side wall of the body is communicated with a bifurcated pipe; the sleeve is communicated with the left end opening of the body; the sealing plug is fixedly connected inside the body to seal the right end opening of the body; and the puncture needle penetrates through the sealing plug and then is inserted into the sleeve, and the length of the puncture needle is greater than that of the sleeve. When the puncture needle is used, the cannula and the puncture needle are punctured into a blood vessel, after the cannula completely enters the blood vessel, the puncture needle is retracted, and the cannula is left in the blood vessel so as to carry out infusion treatment.
However, the end of the existing indwelling needle sleeve is open, and has no closing function, and positive pressure is formed in the sleeve only by a nurse when the tube is sealed, so that blood in a human venous blood vessel cannot flow backwards, but the venous blood of an artificial patient is too high or the nurse is not operated properly, venous blood backflow is easily caused in the infusion-free process, backflow venous blood forms small thrombi in the indwelling needle, and then blockage of the indwelling needle is caused, so that liquid cannot flow smoothly, and meanwhile, the small thrombi are easily brought into the blood during infusion, and then thrombi are formed, and harm is caused to the body.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the utility model mainly aims to provide a side-flow type anti-backflow venous indwelling needle.
The technical scheme of the utility model is that: a side-flow anti-reflux venous indwelling needle comprising:
the side wall of the body is communicated with the bifurcated pipe;
the sleeve is communicated with the left end opening of the body;
the sealing plug is fixedly connected inside the body to seal the right end opening of the body;
the puncture needle penetrates through the sealing plug and then is inserted into the sleeve, and the length of the puncture needle is greater than that of the sleeve;
the sleeve is communicated with the body through a one-way conduction mechanism;
the unidirectional flux mechanism includes:
the elastic membrane cavity comprises a first cavity and an elastic membrane, two ends of the first cavity are respectively communicated with the sleeve and the body, a communication port of the first cavity and the body is communicated into the sleeve through the first cavity, and the elastic membrane for isolating front and rear openings of the first cavity is arranged in the first cavity;
the one-way through cavity is connected with the elastic membrane cavity in parallel, and the conducting direction of the one-way through cavity is from the body to the sleeve.
Further, the unidirectional flux cavity includes:
a second cavity;
the fixed stop block is arranged in the second cavity and used for separating openings in front of and behind the second cavity, a first flow through hole is formed in the middle of the fixed stop block, the inner surface of the first flow through hole, which is positioned on one side of the sleeve, is in a circular truncated cone shape, and the diameter of one side, which is close to the surface of the fixed stop block, of the circular truncated cone shape is larger than the diameter of the inner part, which is close to the fixed stop block;
the movable plug is movably arranged in the second cavity, the movable plug is positioned on one side, close to the sleeve, of the fixed stop block, a cone matched with the circular truncated cone is arranged in the middle of the side face, close to the fixed stop block, of the movable plug, and a second flow through hole for communicating the sleeve with the body is formed in the movable plug outside the cone;
one end of the elastic rope is connected to the end part of the cone body, and the other end of the elastic rope is connected to the wall, close to the body, in the second cavity.
Further, the one-way access lumen further comprises:
and the sealing rubber is laid on the surface of the truncated cone.
Further, the one-way access lumen further comprises:
the guide hole is formed in the side face, close to one side of the sleeve, of the movable plug;
one end of the guide rod is fixedly connected with the wall of the second cavity body close to one side of the sleeve, the guide rod is matched with the guide hole, and the guide rod is movably inserted in the guide hole.
Further, the elastic film is TPE rubber.
Further, the thickness of the elastic membrane is more than 4 mm.
The utility model has the advantages that:
1) compared with the prior art, the utility model discloses a set up elasticity membrane chamber and one-way chamber that switches on simultaneously, pass the pjncture needle through the elasticity membrane chamber when needs puncture and then puncture, treat that the puncture needle withdraws from sleeve pipe and one-way mechanism after the puncture is accomplished, the perforation that the elasticity membrane left when passing the pjncture needle above that under the effect of self elasticity is sealed, because the one-way chamber that switches on is for ending from sleeve pipe to body direction in addition, therefore blood can not follow sleeve pipe flow direction body. The utility model thoroughly avoids blood from flowing back to the sleeve, and the operation process is the same as that of the common venous indwelling needle, so that training is not needed, the work burden of nurses is not increased, the structure is simple, and the price is low;
2) the utility model discloses a with pjncture needle puncture passageway and one-way conduction's liquid circulation passageway separation for the puncture can not cause the destruction to one-way conduction's liquid circulation passageway.
Drawings
FIG. 1 is a schematic structural view of the puncture needle of the present invention inserted into a cannula;
FIG. 2 is a schematic structural view of the puncture needle when the cannula is pulled out;
FIG. 3 is a partial schematic view of FIG. 2A;
fig. 4 is a partial schematic view of fig. 2B.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments:
example 1: referring to fig. 1 to 4, a lateral flow anti-reflux venous indwelling needle includes: the body 1 is hollow, two ends of the body 1 are open, and the side wall of the body 1 is communicated with a bifurcated pipe 6; the sleeve 2 is communicated with the left end opening of the body 1; the sealing plug 4 is fixedly connected inside the body 1 to seal the right end opening of the body 1; the puncture needle 3 penetrates through the sealing plug 4 and then is inserted into the sleeve 2, and the length of the puncture needle 3 is larger than that of the sleeve 2; the sleeve 2 is communicated with the body 1 through a one-way conduction mechanism 5; the unidirectional flux mechanism 5 includes: the elastic membrane cavity 501 comprises a first cavity 5011 and an elastic membrane 5012, two ends of the first cavity 5011 are respectively communicated with the sleeve 2 and the body 1, a communication port of the first cavity 5011 and the body 1 is communicated into the sleeve 2 through the first cavity 5011, and the elastic membrane 5012 for separating front and rear openings of the first cavity 5011 is arranged in the first cavity 5011; the one-way conduction cavity 502, the one-way conduction cavity 502 and the elastic membrane cavity 501 are connected in parallel, and the conduction direction of the one-way conduction cavity 502 is the direction from the body 1 to the sleeve 2.
Compared with the prior art, the utility model discloses a set up elasticity diaphragm chamber 501 and one-way switch-on chamber 502 simultaneously, pass elasticity membrane 5012 with pjncture needle 3 through elasticity diaphragm chamber 501 and then puncture when needs puncture, treat that pjncture needle 3 withdraws from sleeve pipe 2 and one-way switch-on mechanism 5 after the puncture is accomplished, the perforation that stays when elasticity membrane 5012 passes pjncture needle 3 on it under the effect of self elasticity is sealed, in addition because one-way switch-on chamber 501 is for ending from sleeve pipe 2 to body 1 direction, consequently blood can not follow sleeve pipe 2 flow direction body 1. The utility model thoroughly avoids blood from flowing back to the casing 2, and the operation process is the same as that of the common venous indwelling needle, so that training is not needed, the work burden of nurses is not increased, the structure is simple, and the price is low; the utility model discloses a separate pjncture needle 3 puncture passageway and one-way conduction's liquid circulation passageway for pjncture needle 3 can not cause destruction to one-way conduction's liquid circulation passageway.
Further, the one-way lumen 502 comprises: a second cavity 5021; the fixed stop 5022 is arranged in the second cavity 5021 to block openings in the front and the back of the second cavity 5021, a first flow through hole 5023 is formed in the middle of the fixed stop 5022, the inner surface of the first flow through hole 5023 on one side of the sleeve 2 is in a circular truncated cone shape, and the diameter of the circular truncated cone on the side close to the surface of the fixed stop 5022 is larger than the diameter of the circular truncated cone on the side close to the inside of the fixed stop 5022; the movable plug 5024 is movably arranged in the second cavity 5021, the movable plug 5024 is positioned on one side, close to the sleeve 2, of the fixed stop 5022, the middle of the side face, close to the fixed stop 5022, of the movable plug 5024 is provided with a cone matched with the circular truncated cone, and the movable plug 5024 outside the cone is provided with a second through hole 5027 for communicating the sleeve 2 with the body 1; one end of the elastic rope 5025 is connected to the end of the cone, the other end of the elastic rope 5025 is connected to the wall, close to the body 1, in the second cavity 5021, and the tension of the elastic rope 5025 is smaller than the infusion pressure.
In use, if the pressure of the fixed stopper 5022 against the body 1 is greater than the pressure of the fixed stopper 5022 against the cannula 2, the movable plug 5024 is pushed out of the first flow hole 5023, so that the one-way conduction cavity 502 is opened, and the infusion liquid can flow to the cannula 2 through the one-way conduction cavity 502. When no transfusion liquid exists, the movable plug enables the cone to be inserted into the first through hole 5027 under the tension of the elastic rope 5025, so that the flowing direction of the cannula 2 to the body 1 is closed, and blood cannot flow back into the cannula 2 from a blood vessel.
Further, the one-way lumen 502 further comprises: and the sealing rubber 5026 is paved on the surface of the truncated cone.
The sealing rubber 5026 further increases the sealing performance between the movable plug 5024 and the first flow through hole 5023, and the problem that blood flows back to the cannula 2 due to poor sealing is solved.
Further, the one-way lumen 502 further comprises: a guide hole 5029, wherein the guide hole 5029 is formed in the side face of the movable plug 5024 close to one side of the sleeve 2; one end of a guide rod 5028 is fixedly connected with the cavity wall of the second cavity 5021 close to one side of the sleeve 2, the guide rod 5028 is matched with the guide hole 5029, and the guide rod 5028 is movably inserted into the guide hole 5029.
Under the guiding action of the guide rod 4032, the movable plug 5024 moves more stably in the unidirectional flux cavity 502 due to the matching of the sleeve 2 and the guide rod 5028.
Further, the elastic membrane 5012 is TPE rubber.
The elasticity of the TPE rubber is good, when the puncture needle 3 is pulled out after penetrating through the elastic membrane 5012, the elasticity of the TPE rubber can seal the puncture hole, and the TPE rubber is safe and reliable and reaches the medical grade.
Further, the elastic film 5012 has a thickness of 4 mm or more.
The 4 mm elastic membrane 5012 ensures that the puncture needle 3 is pulled out again after passing through the elastic membrane 5012 and the puncture hole of the puncture needle 3 can be reclosed.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A side-flow anti-reflux venous indwelling needle comprising:
the inner part of the body (1) is hollow, two ends of the body (1) are opened, and the side wall of the body (1) is communicated with the bifurcated pipe (6);
the sleeve (2) is communicated with the left end opening of the body (1);
the sealing plug (4) is fixedly connected inside the body (1) to seal the right end opening of the body (1);
the puncture needle (3) penetrates through the sealing plug (4) and then is inserted into the sleeve (2), and the length of the puncture needle (3) is larger than that of the sleeve (2);
the device is characterized in that the sleeve (2) is communicated with the body (1) through a one-way conduction mechanism (5);
the unidirectional conduction mechanism (5) includes:
the elastic membrane cavity (501) comprises a first cavity (5011) and an elastic membrane (5012), two ends of the first cavity (5011) are respectively communicated with the sleeve (2) and the body (1), a communication port of the first cavity (5011) and the body (1) penetrates through the sleeve (2) through the first cavity (5011), and the elastic membrane (5012) for separating front and rear openings of the first cavity (5011) is arranged in the first cavity (5011);
the one-way conduction cavity (502) is connected with the elastic membrane cavity (501) in parallel, and the conduction direction of the one-way conduction cavity (502) is from the body (1) to the sleeve (2).
2. The lateral flow anti-reflux venous indwelling needle of claim 1, wherein the unidirectional access lumen (502) comprises:
a second cavity (5021);
the fixed stop block (5022) is arranged in the second cavity (5021) to cut off openings in the front and the back of the second cavity (5021), a first flow through hole (5023) is formed in the middle of the fixed stop block (5022), the inner surface of one side, located on the sleeve (2), of the first flow through hole (5023) is in a circular truncated cone shape, and the diameter of one side, close to the surface of the fixed stop block (5022), of the circular truncated cone shape is larger than the diameter of the inner portion, close to the fixed stop block (5022);
the movable plug (5024) is movably mounted in the second cavity (5021), the movable plug (5024) is located on one side, close to the sleeve (2), of the fixed stop block (5022), the movable plug (5024) is located on the middle of the side face, close to the fixed stop block (5022), of the movable plug (5024), a cone matched with the circular truncated cone is arranged, and a second flow through hole (5027) communicating the sleeve (2) with the body (1) is formed in the movable plug (5024) outside the cone;
one end of the elastic rope (5025) is connected to the end of the cone, and the other end of the elastic rope (5025) is connected to the wall, close to the body (1), in the second cavity (5021).
3. The lateral flow anti-reflux venous indwelling needle of claim 2, wherein the unidirectional access lumen (502) further comprises:
and the sealing rubber (5026) is paved on the surface of the truncated cone.
4. The lateral flow anti-reflux venous indwelling needle of claim 3, wherein the unidirectional access lumen (502) further comprises:
the guide hole (5029) is formed in the side face, close to one side of the sleeve (2), of the movable plug (5024);
one end of the guide rod (5028) is fixedly connected with the cavity wall, close to one side of the sleeve (2), in the second cavity (5021), one end of the guide rod (5028) is matched with the guide hole (5029), and the guide rod (5028) is movably inserted into the guide hole (5029).
5. The lateral flow anti-reflux venous retention needle as claimed in any of claims 1 to 4, wherein the elastic membrane (5012) is TPE rubber.
6. The lateral flow anti-reflux venous indwelling needle of claim 5, wherein the elastic membrane (5012) is 4 mm or more thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020230375.8U CN212383042U (en) | 2020-02-29 | 2020-02-29 | Side-flow type anti-backflow venous indwelling needle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020230375.8U CN212383042U (en) | 2020-02-29 | 2020-02-29 | Side-flow type anti-backflow venous indwelling needle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212383042U true CN212383042U (en) | 2021-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020230375.8U Active CN212383042U (en) | 2020-02-29 | 2020-02-29 | Side-flow type anti-backflow venous indwelling needle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212383042U (en) |
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2020
- 2020-02-29 CN CN202020230375.8U patent/CN212383042U/en active Active
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