CN110292532B - Free flow prevention valve - Google Patents
Free flow prevention valve Download PDFInfo
- Publication number
- CN110292532B CN110292532B CN201810247588.9A CN201810247588A CN110292532B CN 110292532 B CN110292532 B CN 110292532B CN 201810247588 A CN201810247588 A CN 201810247588A CN 110292532 B CN110292532 B CN 110292532B
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- Prior art keywords
- inlet
- valve core
- valve
- outlet
- elastic
- Prior art date
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- 230000002265 prevention Effects 0.000 title abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 230000009471 action Effects 0.000 claims abstract description 8
- 230000001965 increasing effect Effects 0.000 claims description 9
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000005060 rubber Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000001802 infusion Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J15/00—Feeding-tubes for therapeutic purposes
- A61J15/0026—Parts, details or accessories for feeding-tubes
- A61J15/0076—Feeding pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J15/00—Feeding-tubes for therapeutic purposes
- A61J15/0026—Parts, details or accessories for feeding-tubes
- A61J15/0092—Valves on feeding tubes
Abstract
The invention discloses a free flow prevention valve, comprising: a valve housing having a valve cavity, an inlet and an outlet; the inlet and the outlet are respectively communicated with the valve cavity; an elastic valve core arranged in the valve cavity and provided with a cavity opening downwards; the top of the elastic valve core is closed and seals the inlet, the diameter of the outer side surface of the elastic valve core gradually increases from the inlet to the outlet, and the outer side surface of the elastic valve core is smooth and has no edges; when pumped liquid flows into the inlet, the elastic valve core can elastically deform under the action of the liquid pressure to open the inlet, so that the liquid flowing into the inlet flows into the outlet through the outer side surface of the elastic valve core; when pumped liquid stops flowing into the inlet, the elastic valve core can automatically and elastically reset under the action of self elastic force, so that the top of the elastic valve core closes and seals the inlet. The invention has simple structure, small liquid flow resistance and difficult blockage.
Description
Technical Field
The present invention relates to medical devices, and more particularly to an anti-free flow valve for use with a feeding pump.
Background
Feeding pumps are used to provide nutrition and food to patients when they cannot eat for various reasons. The feeding pump mainly comprises a shell, a transfusion tube assembly, a pump mechanism and the like. An infusion catheter of an infusion tube assembly connected to the drip chamber passes through the infusion wheel of the pump mechanism and is inserted intravenously into the patient. The rollers on the applicator wheel may apply pressure to the infusion catheter to adjust the amount and rate of fluid delivery from the reservoir to the patient. The feed wheel can be driven to rotate by a motor of the pump mechanism, and the number of rollers on the feed wheel is usually three.
In existing feeding pumps, the tubing between the feeding wheel and the patient is typically secured in a detent on the housing, but this is not so secure as to occur during the infusion process in the event that the tubing between the feeding wheel and the patient slips out of the detent. When the tubing between the applicator wheel and the patient slips, the pump mechanism, while inactive, is often free flowing. At this time, the liquid entering the patient is controlled by gravity only, which results in a large amount of liquid being introduced into the patient in a short time, thereby inducing medical accidents and even causing death of the patient.
In order to prevent the free flow phenomenon, one solution is to provide an anti-free flow valve on the conduit between the feed wheel and the patient. The anti-free flow valve is only opened when the pumped liquid is flowing in, and when the pump mechanism is stopped, even if feeding liquid flows into the anti-free flow valve, the pressure of the liquid is insufficient to open the anti-free flow valve, so that the feeding liquid can be prevented from flowing freely. However, the existing free flow prevention valve has the defects of complex structure, more flow dividing ribs, high liquid flow resistance, low flow speed, easy blockage, high manufacturing cost and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing the free flow prevention valve which has a simple structure, small liquid flow resistance and difficult blockage.
In order to solve the technical problems, the invention adopts the following technical scheme:
An anti-free flow valve comprising: a valve housing having a valve cavity, an inlet and an outlet; the inlet and the outlet are respectively communicated with the valve cavity; an elastic valve core arranged in the valve cavity and provided with a cavity opening downwards; the top of the elastic valve core is closed and seals the inlet, the diameter of the outer side surface of the elastic valve core gradually increases from the inlet to the outlet, and the outer side surface of the elastic valve core is smooth and has no edges; when pumped liquid flows into the inlet, the elastic valve core can elastically deform under the action of the liquid pressure to open the inlet, so that the liquid flowing into the inlet flows into the outlet through the outer side surface of the elastic valve core; when pumped liquid stops flowing into the inlet, the elastic valve core can automatically and elastically reset under the action of self elastic force, so that the top of the elastic valve core closes and seals the inlet.
After the technical scheme is adopted, the invention has at least the following advantages and characteristics:
1. The diameter of the outer side surface of the elastic valve core is gradually increased from the inlet to the outlet, and the outer side surface is smooth and has no edges, so that liquid flowing into the inlet of the anti-free flow valve easily flows into the outlet through the outer side surface of the elastic valve core, the liquid flowing resistance is small, and the flow speed is high;
2. When the feeding liquid flows through the outer side surface of the elastic valve core, the feeding liquid can smoothly flow down from the periphery, dead angle areas where the liquid is difficult to flow do not exist, the feeding liquid can not be accumulated on the surface of the elastic valve core, the liquid channel is prevented from being blocked, and the risk of bacteria breeding and infection is reduced;
3. the anti-free flow valve has simple structure and low manufacturing cost.
Drawings
Fig. 1 is an external perspective view of an anti-free flow valve according to a first embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an anti-free flow valve according to a first embodiment of the present invention, wherein the resilient spool is in a closed state.
Fig. 3 is a schematic cross-sectional view of an anti-free flow valve according to a first embodiment of the present invention, in which an elastic valve element is in an open state.
Fig. 4 and 5 show perspective views of the elastic valve core of the anti-free flow valve according to the first embodiment of the present invention, respectively, from different angles.
Fig. 6 shows a front view of the elastic spool of the anti-free flow valve according to the first embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view of an anti-free flow valve according to a second embodiment of the present invention, wherein the resilient spool is in a closed state.
Fig. 8 is a schematic cross-sectional view of an anti-free flow valve according to a second embodiment of the present invention, in which an elastic valve element is in an open state.
Fig. 9 and 10 are perspective views showing an elastic valve body of a free flow prevention valve according to a second embodiment of the present invention from different angles, respectively.
Fig. 11 shows a front view of an elastic spool of an anti-free flow valve according to a second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Reference is made to fig. 1 to 6. An anti-free flow valve according to an embodiment of the present invention includes a valve housing 1 and an elastic valve body 2.
The valve housing 1 has a valve chamber 10, an inlet 11 and an outlet 12, the inlet 11 and the outlet 12 being in communication with the valve chamber 10, respectively. In the present embodiment, the valve housing 1 includes an upper cover 1a and a base 1b, and the upper cover 1a and the base 1b are hermetically connected and together define a valve chamber 10. The inlet 11 and the outlet 12 are respectively constituted by an inlet pipe and an outlet pipe, the inlet pipe being connected to the upper cover 1a, and the outlet pipe being connected to the base 1 b. In the example of fig. 1 to 3, the center lines of the spring valve spool 2, the inlet port 11, the outlet port 12, and the valve chamber 10 are all coaxial with the center line of the valve housing 1.
The elastic spool 2 is disposed in the valve chamber 10 and has a cavity 20 that opens downward. The top of the resilient spool 2 closes and seals the inlet port 11 as shown in fig. 2. The diameter of the outer side surface of the elastic valve core 2 gradually increases from the inlet 11 to the outlet 12, and the outer side surface of the elastic valve core 2 is smooth without edges. The elastic valve core 2 may be made of silica gel, rubber, thermoplastic elastomer (TPE), or the like.
Preferably, the outer side surface of the elastic valve core 2 is provided with at least three notches 21 which are opened downwards and penetrate through the cavity 20 of the elastic valve core 2, and a supporting leg 22 is formed between every two adjacent notches 21. Further, the at least three notches 21 are provided at equal intervals on the outer side surface of the elastic spool 2. The elastic valve core 2 is supported on the bottom surface 101 of the valve cavity 10, and the outer side surface of the bottom end of each supporting leg 22 abuts against the side wall 102 of the valve cavity 10, so that the deflection of the elastic valve core can be prevented, and the generation of the vertical upward elastic restoring force is ensured.
The outlet end 112 of the inlet 11 is arranged at the top surface 103 of the valve chamber 10. The inlet end 121 of the outlet 12 is arranged on the bottom surface 101 of the valve chamber 10, and at least three legs 22 of the resilient spool 2 are enclosed around the inlet end 121 of the outlet 12.
In the first embodiment, the top of the elastic valve core 2 is a plane 23, the outer side surface of the elastic valve core 2 is a convex arc surface 24, and the top end of the outer side surface is connected with the periphery of the plane 23; the flat surface 23 abuts the top surface 103 of the valve chamber 10 and closes the outlet end 112 of the inlet 11. The convex arc surface 24 may be a spherical surface, but is not limited thereto.
In clinical applications, the anti-free flow valve may be provided on the infusion line between the feeding pump applicator and the patient. When the liquid pumped by the feeding pump flows into the inlet 11, the elastic valve body 2 is elastically deformed by the pressure of the liquid to open the inlet 11, so that the liquid flowing into the inlet 11 flows into the outlet 12 through the outer side surface of the elastic valve body 2, as shown in fig. 3. And once the infusion pipeline between the liquid feeding wheel of the feeding pump and the patient slips, the feeding pump can stop working. When the liquid pumped by the feeding pump stops flowing into the inlet 11, the elastic valve core 2 can automatically and elastically reset under the action of the self elastic force, so that the top of the elastic valve core 2 is closed again and the inlet 11 is sealed, and the free flow of the feeding liquid can be prevented. Because the diameter of the outer side surface of the elastic valve core 2 gradually increases from the inlet to the outlet, and the outer side surface is smooth and has no edges, the liquid flowing into the inlet 11 of the anti-free flow valve easily flows into the outlet 12 through the outer side surface of the elastic valve core 2, the liquid flowing resistance is small, the flow speed is high, and the feeding liquid cannot be accumulated on the surface of the elastic valve core.
Preferably, each notch 21 is composed of a first notch 211 and a second notch 212, and the top of the second notch 212 is connected to the bottom of the first notch 211. The width of the first notch 211 and the width of the second notch 212 are gradually increased from top to bottom, and the width increasing speed of the second notch 212 is greater than the width increasing speed of the first notch 211. The profile of the first notch 211 is a convex arc, and the two sides 214 of the second notch 212 are convex arcs. The advantage of this structure is that when the feeding liquid flowing down from the top end of the outer side surface of the elastic valve element flows to the top end of the notch 21, the feeding liquid does not directly fall from the top end of the notch 21, but flows to the bottom of the outer side surface of the elastic valve element along the outer edges of the two sides 213 of the first notch 211 and the outer edges of the two sides 214 of the second notch 212, and then flows into the inlet end 121 of the outlet 12 through the second notch 212, so that the flow of the feeding liquid can be more uniform, and dead corner areas where the liquid is difficult to flow are avoided.
Fig. 7 to 11 show an anti-free flow valve according to a second embodiment of the present invention. The main difference between this second embodiment and the first embodiment is the shape of the top and outer sides of the resilient spool. In the second embodiment, the top of the elastic valve core 2A is a cone, and the outer side surface of the elastic valve core 2A is composed of a conical surface 23A and a convex arc surface 24A of the cone, and the top end of the convex arc surface 24A is connected with the bottom end periphery of the conical surface 23A. The convex arc surface 24A may be a spherical surface, but is not limited thereto. As shown, the tip of the cone extends into the outlet end 112 of the inlet 11, and the conical surface 23A of the cone forms a wire seal with the outlet end 112 of the inlet 11.
Similar to the first embodiment, the elastic spool 2A has a cavity 20A that opens downward. The outer side surface of the elastic valve core 2A is provided with at least three notches 21A which are downwards opened and penetrate through the cavity 20A of the elastic valve core 2A, and a supporting leg 22A is formed between every two adjacent notches 21A. Further, the at least three notches 21A are provided at equal intervals on the outer side surface of the elastic spool 2A. The elastic valve core 2A is supported on the bottom surface 101 of the valve cavity 10, and the outer side surface of the bottom end of each supporting leg 22A abuts against the side wall 102 of the valve cavity 10. At least three legs 22A of the resilient spool 2 are enclosed around the inlet end 121 of the outlet 12. Each notch 21A is composed of a first notch portion 211A and a second notch portion 212A, and the top of the second notch portion 212A is connected to the bottom of the first notch portion 211A. The width of the first notch portion 211A and the width of the second notch portion 212A are gradually increased from top to bottom, and the width increasing speed of the second notch portion 212A is greater than the width increasing speed of the first notch portion 211A. The outline shape of the first notch portion 211A is a convex arc shape, and two sides 213A of the first notch portion 211A are shown in fig. 9. The two sides 214A of the second notch portion 212A are in a convex arc shape.
When the liquid pumped by the feeding pump flows into the inlet 11, the elastic valve body 2A is elastically deformed by the liquid pressure to open the inlet 11, so that the liquid flowing into the inlet 11 flows into the outlet 12 through the outer side surface of the elastic valve body 2A, as shown in fig. 8. When the liquid pumped by the feeding pump stops flowing into the inlet 11, the elastic valve core 2A can automatically and elastically reset under the action of the self elastic force, so that the top of the elastic valve core 2A is closed again and the inlet 11 is sealed.
The present embodiments are described in conjunction with specific examples, but it will be understood by those skilled in the art that the invention is not limited to the examples described herein and that various modifications and variations may be made without departing from the spirit and scope of the invention.
Claims (8)
1. An anti-free flow valve, comprising:
a valve housing having a valve cavity, an inlet and an outlet; the inlet and the outlet are respectively communicated with the valve cavity; the outlet end of the inlet is arranged on the top surface of the valve cavity;
an elastic valve core arranged in the valve cavity and provided with a cavity opening downwards; the top of the elastic valve core is closed and seals the inlet, the diameter of the outer side surface of the elastic valve core gradually increases from the inlet to the outlet, and the outer side surface of the elastic valve core is smooth and has no edges; the outer side surface of the elastic valve core is provided with at least three notches which are downwards opened and penetrate through the cavity of the elastic valve core, and a supporting leg is formed between every two adjacent notches;
When pumped liquid flows into the inlet, the elastic valve core can elastically deform under the action of liquid pressure to open the inlet, so that the liquid flowing into the inlet flows into the outlet through the outer side surface of the elastic valve core; when pumped liquid stops flowing into the inlet, the elastic valve core can automatically and elastically reset under the action of self elastic force, so that the top of the elastic valve core closes and seals the inlet.
2. The anti-free flow valve of claim 1, wherein the at least three notches are equally spaced on an outer side of the resilient spool.
3. The anti-free flow valve of claim 1, wherein each of the notches is comprised of a first notch portion and a second notch portion, the top of the second notch portion being connected to the bottom of the first notch portion; the width of the first notch part and the width of the second notch part are gradually increased from top to bottom, and the width increasing speed of the second notch part is larger than that of the first notch part; the profile shape of the first notch part is a convex arc shape, and the shape of two side edges of the second notch part is a convex arc shape.
4. The anti-free flow valve of claim 1, wherein the resilient spool is supported on a bottom surface of the valve cavity, and an outer side surface of the bottom end of each leg abuts a side wall of the valve cavity; the inlet end of the outlet is arranged on the bottom surface of the valve cavity, and at least three support legs of the elastic valve core are enclosed around the inlet end of the outlet.
5. The anti-free flow valve of claim 1, wherein the valve housing comprises an upper cover and a base, the upper cover and the base being sealingly connected and together defining the valve cavity;
The inlet and the outlet are respectively formed by an inlet pipe and an outlet pipe, the inlet pipe is connected with the upper cover, and the outlet pipe is connected with the base.
6. The valve of claim 1, wherein the resilient spool is made of silicone, rubber, or a thermoplastic elastomer.
7. The valve of claim 1, wherein the top of the elastic valve element is a plane, the outer side surface of the elastic valve element is a convex arc surface, and the top end of the outer side surface is connected with the periphery of the plane;
the plane abuts against the top surface of the valve cavity and closes the outlet end of the inlet.
8. The valve as claimed in claim 1, wherein the top of the elastic valve core is a cone, the outer side surface of the elastic valve core is composed of a conical surface and a convex arc surface of the cone, and the top end of the convex arc surface is connected with the bottom end periphery of the conical surface;
The top end of the cone extends into the outlet end of the inlet, and the conical surface of the cone and the outlet end of the inlet form linear sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247588.9A CN110292532B (en) | 2018-03-23 | 2018-03-23 | Free flow prevention valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247588.9A CN110292532B (en) | 2018-03-23 | 2018-03-23 | Free flow prevention valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110292532A CN110292532A (en) | 2019-10-01 |
| CN110292532B true CN110292532B (en) | 2024-05-03 |
Family
ID=68026062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810247588.9A Active CN110292532B (en) | 2018-03-23 | 2018-03-23 | Free flow prevention valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110292532B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002267032A (en) * | 2001-03-12 | 2002-09-18 | Jiro Matsuyama | Ball check valve |
| CN1440305A (en) * | 2000-06-29 | 2003-09-03 | 雀巢制品公司 | Medium cracking pressure valve arrangement |
| CN105757010A (en) * | 2013-09-07 | 2016-07-13 | 中山市丰申电器有限公司 | Siphon capable of quickly building liquid surging channel |
| CN208799545U (en) * | 2018-03-23 | 2019-04-30 | 美昕医疗器械(昆山)有限公司 | Anti-free flow valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6988510B2 (en) * | 2002-03-22 | 2006-01-24 | Halkey-Roberts Corporation | Disc check valve |
| US7296782B2 (en) * | 2004-10-01 | 2007-11-20 | Halkey-Roberts Corporation | Dome check valve |
-
2018
- 2018-03-23 CN CN201810247588.9A patent/CN110292532B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1440305A (en) * | 2000-06-29 | 2003-09-03 | 雀巢制品公司 | Medium cracking pressure valve arrangement |
| JP2002267032A (en) * | 2001-03-12 | 2002-09-18 | Jiro Matsuyama | Ball check valve |
| CN105757010A (en) * | 2013-09-07 | 2016-07-13 | 中山市丰申电器有限公司 | Siphon capable of quickly building liquid surging channel |
| CN208799545U (en) * | 2018-03-23 | 2019-04-30 | 美昕医疗器械(昆山)有限公司 | Anti-free flow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110292532A (en) | 2019-10-01 |
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