KR100896976B1 - Device for preventing backward flowing in infusion solution delivering set - Google Patents

Abstract

The present invention is to provide a new type of back flow prevention device for fluid infusion dispensers that can be performed as well as to prevent the back flow of the fluid dispenser, the initial setting operation of the fluid dispenser, there is a plotter accommodating space therein It is formed, the fluid inlet is formed on the side wall of the plotter receiving space, the fixing body is formed in the lower portion is the fluid outlet passage communicating with the plotter receiving space; A floater comprising a buoyancy generating unit which is moved up and down in the plotter accommodation space and a packing unit which is connected to the buoyancy generating unit to block the sap outflow passage when the buoyancy generating unit is lowered by the action of buoyancy; Characterized in that comprises a.

Infusion solution, Blood reflux, Plotter

Description

DEVICE FOR PREVENTING BACKWARD FLOWING IN INFUSION SOLUTION DELIVERING SET}

The present invention relates to a fluid infusion device backflow prevention device that enables blood backflow prevention of a medical fluid injector and smooth fluid supply into the body, and more particularly, an infusion solution injected into a Ringer's fluid bottle or a color (sack). ), Which prevents the backflow of blood due to the inconvenience of checking the residual amount and the carelessness when the administration is completed, and also prevents the flow of fluid into the body. will be.

Conventional infusion dispenser is shown in Figures 1 and 2, the inlet portion of the fluid dropping 2 and the adjustment portion (4) provided in the center of the flexible hose (3), and the hose (3) It consists of a needle 5 connected to one end. That is, when the sap is supplied by inserting the insertion port 2a of the drop section 2 having the air suction port and the sap outlet port integrally with the sack or Ringer's solution bottle 6, the sap supplied to the drop section 2 The flexible hose 3 is supplied to the needle 5 and is administered to the body. In this case, the adjusting unit 4 installed at the center of the hose 3 through which the sap passes serves to regulate the dose.

However, as a problem of the conventional fluid dispenser, when the administration of the fluid is terminated and the needle is not removed at the same time, blood flows back through the needle or the air is injected into the body, which may cause side effects. When the fluid injected into the color is administered to the body, it takes a relatively long time, so it is very difficult to continuously observe the time point at which the administration of the fluid is terminated and take appropriate measures.

In addition, during the administration of fluid, the position of the fluid dispenser is sharply lowered compared to the patient's body, or when the patient's heart position is increased compared to the location of the fluid dispenser due to the patient's movement, the pressure of the blood vessel is increased and the pressure drops relatively. There is a problem that the blood is pushed back out of the patient's body through the needle.

On the other hand, as a conventional technology integrated in the present specification, Republic of Korea Utility Model No. 1997-056956 (published on November 10, 1997) "ring fluid supply control device and backflow prevention device" has been published.

The prior art discloses a spherical valve body that is operated by the lifting force and self weight of the sap. However, these spherical valve bodies have the following problems.

When manufacturing a spherical valve body made of plastic or the like, inevitably a protrusion (generated due to a resin injection part or a mold joint part) is formed on the spherical surface, and when the protrusion is formed on the spherical surface, the valve body is formed. Incomplete closure occurs because it cannot be a perfect sphere. In addition, when operated due to the buoyancy of the fluid and the weight of the valve body, the weight of the spherical valve body should be determined within an extremely limited range. Therefore, when a very light material is selected to have the lifting force, Has a problem that the sealing force is weakened. That is, the sealing force is generated by the weight of the valve body, and when the weight is light, the sealing force itself must be weak, and also the sealing body is extinguished due to the external shock.

The present invention has been made to solve the problems of the prior art as described above, as well as to prevent the backflow of the sap dispenser, a new type of sap dispenser that can perform the initial setting operation of the sap dispenser, etc. very conveniently To provide a backflow prevention device.

In order to solve the above problems, the present invention, in the infusion device backflow prevention device for blood backflow prevention of the fluid injector made to inject the fluid into the body through the injection needle: a plotter accommodating space is formed therein, the A fluid inlet is formed on the side wall of the plotter accommodating space and a fluid inflow passage is formed in the lower part in communication with the plotter accommodating space; A floater comprising a buoyancy generating unit which is moved up and down in the plotter accommodation space and a packing unit which is connected to the buoyancy generating unit to block the sap outflow passage when the buoyancy generating unit is lowered by the action of buoyancy; Characterized in that comprises a.

In the above, it is preferable that the pipe-shaped insertion portion for protruding downwardly to be coupled to the inlet outlet of the drop portion of the infusion device in the lower part of the fixture.

In the above, it is preferable that an auxiliary hole is formed in the upper portion of the plotter accommodation space.

The valve body accommodating space is formed in an upper portion of the fixed body, the valve body accommodating space is formed, and the valve body accommodating space is provided with a valve body configured to ascend or descend according to a flow rate change of the fluid passing through the sap outflow passage. It is preferable to be.

In the above, it is preferable that the lower portion of the packing portion is conical.

In the above, the sap outflow passage is divided into a first transfer portion of the upper portion and the second transfer portion of the lower portion along the flow direction of the sap, the support jaw is formed at the end of the first transfer portion; Located in the second transfer portion is provided with a sheet-shaped packing on the support jaw to support the upper portion of the edge; A pressurizing rod formed to push the central portion of the sheet-shaped packing toward the first transfer portion is provided, and a press member mounted on the second transfer portion is provided; This is preferred.

The present invention effectively achieves the backflow prevention of the fluid injector by the action of the packing portion of the plotter and the fluid outflow passage of the fixture in the case of the conventional fluid administration as described above.

That is, the present invention can prevent the regurgitation of blood due to inadequateness due to the checking of the residual amount and inadvertent upon completion of administration when injecting an infusion solution injected into a Ringer's bottle or sack into the body. It can provide a backflow prevention device for the sap dispenser that can smoothly and conveniently supply the fluid to the furnace.

In the description of the following embodiments, the same name and the same reference numerals should be understood as the same configuration having the same function.

Hereinafter, the configuration and operation of the first embodiment according to the present invention will be described in detail.

3 is a longitudinal cross-sectional view of the first embodiment according to the present invention inserted into the drop portion, Figure 4 is a cross-sectional view AA of Figure 3, Figure 5 is a cross-sectional view BB of Figure 3, Figure 6 is a CC of Figure 3 7 is an exploded perspective view of the embodiment of FIG. 3, FIG. 8 is an exploded cross-sectional perspective view of the embodiment of FIG. 3, FIG. 9 is a cross-sectional perspective view of the embodiment of FIG. 3, and FIG. 10 is an embodiment of FIG. 3. The working state of the example is shown in stages.

This embodiment is used by being inserted into the drop portion 2 of the infusion dispenser.

This embodiment largely consists of a fixture 100 and a plotter 200.

The fixed body 100 has a plotter accommodating space 110 formed therein, while a valve body accommodating space 120 is formed at an upper portion of the plotter accommodating space 110, and an infusion solution is provided below the plotter accommodating space 110. Outflow passage 131 is formed.

The plotter accommodating space 110 and the valve body accommodating space 120 communicate with each other through the auxiliary hole 112a, and the plotter accommodating space 110 and the fluid outlet passage 131 also communicate with each other.

In this embodiment, the upper assembly 100a and the lower assembly 100b are assembled to each other in order to form the plotter accommodation space 110, the valve body accommodation space 120, and the sap outflow passage 131. .

That is, the valve body accommodating space 120 is formed by the upper assembly 100a, the fluid outflow passage 131 is formed by the lower assembly 100b, and the plotter accommodating space 110 is connected to the upper assembly 110a. It is formed by the assembly of the lower assembly (100b).

The plotter 200, which will be described later, is inserted into the plotter accommodation space 110 so as to be movable up and down. In addition, the inlet 111a is formed on the sidewall 111 forming the plotter accommodation space 110.

In addition, the sap outflow passage 131 is formed in the center of the lower surface 113 of the plotter accommodating space 110.

Therefore, the flow of the basic sap flows along the sap outflow passage 131 after the sap flows into the plotter accommodating space 110 through the sap inlet 111a.

This flow path of the sap does not lower the plotter 200 to be described later. If the flow path of the sap is formed along the plotter 200, the flow of the sap itself may lower the plotter 200 to prevent smooth sap flow.

The stationary body 100 is fixed by inserting the pipe-shaped inserting portion 100b-1 formed in the lower assembly 100b into the inlet port 2b of the drop portion 2. Thus, when the pipe-shaped insertion part 100b-1 is formed and the fixing body 100 can be fixed to the infusion outlet 2b of the drop part 2, even if the specification of the drop part 2 changes, There is an advantage that the specification of 100 does not need to be changed. That is, the drop unit 2 itself is produced in various sizes and shapes for each manufacturing company, but since the inlet port 2b of the drop unit 2 is a portion that is coupled to the hose 3, its size is almost the same as that of any company. Do. Therefore, when the fixing body 100 is fixed to the inner circumferential surface of the dropping unit 2, the fixing unit 100 having various standards is required according to the specification of the dropping unit 2, but the fixing unit 100 may be dropped into the dropping unit 2. When fixed to the sap outlet (2b) of the can be used for the drop portion (2) of various standards as a fixed body 100 of a single standard.

The plotter 200 is inserted into the plotter accommodation space 110 of the fixture 100.

The plotter 200 includes a cylindrical body 210 and a packing part 220 connected to the cylindrical body 210.

On the outer circumferential surface of the cylindrical body 210, a plurality of guide protrusions 212 is formed in the vertical direction.

The cross section of the guide protrusion 212 is generally triangular in shape. The guide protrusion 212 serves to guide the shank simultaneous cylindrical body 210 of the cylindrical body 210 to be located at the center of the plotter accommodating space 110, and at the same time, the outer circumferential surface of the cylindrical body 210 is arranged to accommodate the plotter accommodating space. By spaced apart from the side wall 111 of the (110) by a predetermined interval to prevent the vertical movement of the cylindrical body 210 due to the sap buried in the inner peripheral surface of the side wall (111).

In the present embodiment, six guide protrusions 212 are provided, but the number thereof may be changed according to the embodiment.

The cylindrical body 210 is sufficient to be made of a material capable of receiving buoyancy, the cylindrical body 210 to rise and fall in the plotter accommodation space 110 due to its buoyancy in accordance with the rise and fall of the water level of the sap. do.

Therefore, in this embodiment, the cylindrical body 210 acts as a buoyancy generating portion.

Meanwhile, the packing part 220 is connected to the cylindrical body 210.

The packing part 220 serves to block the sap outflow passage 131 of the fixture 100 when the plotter 200 descends. In the present embodiment, the packing part 220 is formed to block the sap outflow passage 131 while being inserted into the sap outflow passage 131 of the fixture 100 by forming a lower conical shape.

The packing part 220 needs to be made of a very flexible material such as silicone rubber. However, any material known as the packing member may be selected as the material of the packing unit.

On the other hand, the auxiliary hole 112a is formed in the upper surface 112 of the plotter accommodation space 110.

The auxiliary hole 112a is for allowing the air in the upper portion of the plotter accommodation space 110 to flow smoothly with the outside. That is, the air above the plotter accommodating space 110 escapes upward through the auxiliary hole 112a when the plotter 200 rises, so that the air does not become compressed, and the auxiliary hole when the plotter 200 descends. The air flows in from the outside through the 112a so that the upper portion of the plotter accommodation space 110 does not fall into a vacuum state. If a vacuum and a compressed state of air occur in the plotter accommodating space 110, this may be a factor that prevents the smooth rise and fall of the plotter 200.

However, the auxiliary hole 112a should be smaller in diameter than the inlet 111a. This is because when the auxiliary hole 112a is formed too large, the main flow path of the sap passes through the orifice hole 112a, the plotter accommodating space 110, and the sap outflow passage 131, whereby the flow of the sap plotter 200 This is because it can descend unnecessarily.

In addition, the valve body 123 is provided in the upper portion in order to more actively prevent the unnecessary fall of the plotter 200.

The valve body accommodating space 120 is formed in the upper part of the auxiliary | assistant hole 112a rigidly in the upper part of the fixed body 100, and the valve body 123 is provided in the valve body accommodating space 120. FIG.

A plurality of cutouts 122a are formed in the side wall 122 of the valve body accommodating space 120 so as to easily insert the valve body 123. 122b) is formed to protrude. The valve body guide jaw 122b serves to limit the upward movement of the valve body 123 within a predetermined range. Of course, various methods may be proposed as a technique for limiting the upward movement of the valve body 123.

Since the plurality of cutouts 122a are formed in the side wall 122, the upper portion of the valve body accommodating space 120 may be widened. Therefore, the operation of inserting the valve body 123 into the valve body accommodating space 120 may be very large. It's easy. That is, since the valve body 123 is prevented from being inserted by the valve body guide jaw 122b, the incision groove 122a is formed in advance in order to open the valve body guide jaw 122b. Therefore, the cutting groove 122a is preferably formed between the valve body guide tuck 122b.

In the present embodiment, the valve body 123 is cylindrical, and protrusions 123a are formed on the upper and lower surfaces thereof. The protruding portion 123a, which is substantially meaningful, is the protruding portion 123a formed on the lower surface of the valve body 123, but the upper surface of the valve body 123 can be assembled to the valve body accommodating space 120 regardless of its direction. Protrusions 123a were formed on both the lower and lower surfaces.

The valve body 123 generally rises upward due to the buoyancy of the sap. However, when the flow rate of the sap passing through the auxiliary hole 112a increases, the valve body 123 is led by the flow of the sap to move downward. In other words, in a typical small amount of fluid flow, the valve body 123 floats and the entire auxiliary hole 112a acts as a cross-sectional area. However, when the flow of the fluid passing through the fluid outlet passage 131 rises sharply, The valve body 123 is lowered by the flow of water, and the lower surface of the valve body 123 is spaced apart from the lower surface 121 of the valve body accommodating space 120 by the protrusion size of the protrusion 123a and spaced apart from the lower surface 121. As long as the flow path cross-sectional area. That is, the flow path cross-sectional area is reduced to reduce the amount of sap that passes through the auxiliary hole 112a, so that the plotter 200 affects the sap flow even when there is a large amount of sap flowing through the sap outflow passage 131. You will not receive.

Hereinafter, the operation of the present embodiment will be described with reference to FIG. 10.

10 are state diagrams for explaining the operation of the first embodiment.

(a) shows a state in which no sap exists.

(b) shows the state in which a large amount of sap is falling into the drop portion for the initial setting of the drop portion. The plotter 200 rises by the force of buoyancy, and a large amount of the sap passes through the sap inlet 111a and exits the sap outflow passage 131. At this time, the initial setting of the infusion dispenser is completed by this operation.

At this time, the valve body 123 is maintained in the lower state by the flow of the fluid passing through the auxiliary hole (112a) despite the buoyancy.

(C) is a state in which the sap is normally supplied, the plotter 200 is raised by buoyancy, and the valve body 123 is maintained in a state raised upward by the buoyancy because the flow of the sap is reduced. do.

(d) the supply of the sap is stopped, the plotter 200 descends with the drop of the fluid level, and the packing part 220 of the plotter 200 blocks the sap outflow passage 131 of the fixed body 100. It is a state which prevents the sap from escaping from the drop part 2 any longer. Of course, the valve body 123 is also lowered.

Since the sap no longer exits from the dropper 2, the blood does not flow back even when the supply of the sap is interrupted.

The modification of the first embodiment will be described below.

FIG. 11 is a longitudinal cross-sectional view of a modification example of the first embodiment inserted into a drop portion, FIG. 12 is a cross-sectional view taken along line D-D of FIG. 11, and FIG. 13 is an exploded cross-sectional perspective view of the embodiment of FIG. 11.

The difference between the present modification and the first embodiment is in the form of the valve body accommodating space 120 and in the form of the valve body 123, and the rest are the same.

In the present embodiment, the valve body 123 uses a ball shape.

In addition, in the present embodiment, the groove portion 121a is formed in the lower surface 121 of the valve body accommodating space 120, and when the valve body 123 comes into contact with the lower surface 121 of the valve body accommodating space 120, the groove portion ( The air and the like can be distributed through 121a).

Hereinafter, the configuration and operation according to the second embodiment of the present invention will be described in detail.

14 is a longitudinal cross-sectional view of a second embodiment according to the present invention inserted into a drop portion, FIG. 15 is a sectional view taken along line EE of FIG. 14, FIG. 16 is a sectional view taken along line FF of FIG. 14, and FIG. 17 is a GG of FIG. 14. FIG. 18 is a sectional view taken along line HH of FIG. 14, FIG. 19 is a sectional view taken along line II of FIG. 14, FIG. 20 is a sectional view taken along line JJ of FIG. 14, FIG. 21 is an exploded perspective view of the embodiment of FIG. 14, and FIG. FIG. 23 is a cross-sectional perspective view of the embodiment of FIG. 14, and FIG. 24 is a view for explaining an operating state of FIG. 14.

This embodiment largely consists of the fixture 100, the plotter 200, the sheet-shaped packing 300, the pressing member 400.

In this embodiment, in particular, the sap outflow passage 131 has a feature.

To this end, in this embodiment, in addition to the upper assembly (100a), the intermediate assembly (100c) and the pipe-shaped inserting portion (100b-1) is formed in which the sap outflow passage 131 is formed and assembled to the intermediate assembly (100c) Consisting of a lower assembly 100b.

The sap outflow passage 131 is formed by being divided into an upper first conveying part 131a and a lower second conveying part 131b along the flow direction of the sap. The first transfer part 131a is formed at the end communicating with the second transfer part 131b, and the support jaw 131c is formed, and the second transfer part 131b at which the support jaw 131c is positioned is a sheet-type packing 300. packing is provided.

The sheet-shaped packing 300 is slightly curved toward the second conveying part 131b and is positioned by the pressing bar 410 of the pressing member 400 mounted at the edge of the supporting jaw 131c and mounted to the second conveying part 131b. The center portion is pushed toward the first transfer portion 131a but is positioned on the second transfer portion 131b bounded by the first transfer portion 131a by the support jaw 131c.

The packing movement preventing part 131d is formed in the first transfer part 131a.

The packing movement preventing part 131d has a cross section that can block the central portion of the sheet-shaped packing 300 from being excessively pushed into the first transfer part 131a.

The second transfer part 131b is provided with a plurality of packing guide parts 131e radially protruding to guide the position of the sheet-shaped packing 300.

The packing guide part 131e guides the sheet-shaped packing 300 to be centrally positioned without being biased to one side while smoothly inducing the passage of the sap.

Pressing member 400 is formed with a pressing rod 410 for pushing the sheet-shaped packing 300 to the center of one side, the outer shape is formed while forming a cross-section cross-shaped end is fitted to the second transfer portion (131b) Built or glued and mounted.

In the assembly of the pressing member 400, when assembling the lower assembly 100b to the intermediate assembly 100c, the pedestal 100b-2 formed on the lower assembly 100b pushes the pressing member 400, thereby pressing the pressing member ( 400 is fitted to the second transfer part 131b.

Meanwhile, an air hole 100b-3 is formed on the side wall of the lower assembly 100b, and a ring-shaped elastic body 500 is mounted on the outer circumferential surface of the lower assembly 100b to surround the air hole 100b-3. . The ring-shaped elastic body 500 is preferably a rubber material.

The operation of the second embodiment will be described below.

First, the flow of the sap passing through the sap outflow passage 131 will be described.

The sap flowing into the first conveying part 131a of the sap outflow passage 131 passes through the packing movement preventing part 131d to apply pressure to the sheet-shaped packing 300.

At this time, the sheet-shaped packing 300 formed to be slightly curved toward the second transfer part 131b maintains its original position by the pressing rod 410 of the pressing member 400 pressed under the sheet-shaped packing 300 despite the pressure of the sap. Done.

However, the edge of the sheet-shaped packing 300, which is supported by the support jaw 131c formed at the end of the first conveying part 131a, is bent toward the second conveying part 131b by the pressure of the sap.

When the edge of the sheet-shaped packing 300 is bent, the sap passes, and the transfused sap exits between the gaps of the outer cross of the pressing member 400 mounted on the second conveying part 131b.

On the other hand, when the supply of the sap is stopped, the pressure received from the upper portion of the sheet-shaped packing 300 is lowered, the edge of the sheet-shaped packing 300 is restored to be in close contact with the support jaw (131c).

On the other hand, in order to cause blood flow back when the patient lifts the hand, the fluid pressure of the lower portion of the sheet-type packing 300 rises so that the fluid of the lower portion of the sheet-type packing 300 flows backward and passes the sheet-type packing 300. Although moving to the upper portion of the sheet-shaped packing 300, in this embodiment, the edge of the sheet-shaped packing 300 is caught by the support jaw 131c to block the upper movement of the fluid to prevent the back flow of blood.

On the other hand, Figure 24 is a view showing a state of discharging air collected in the lower portion of the second embodiment.

In this embodiment, due to the sheet-shaped packing 300, the air of the lower part of the fixture 100 becomes very difficult to move to the upper part of the fixture 100, and air bubbles may be collected in the lower part of the fixture 100.

That is, when a slight pressure is applied to the hose as shown in the right figure of FIG. 24, the air pressure generated at this time pushes the ring-shaped elastic body 500 blocking the air hole 100b-3, and the air escapes through the gap. The ring-shaped elastic body 500 is then returned to its original position.

The above embodiments are merely preferred embodiments of the present invention, and the technical spirit of the present invention may be variously modified or adjusted by those skilled in the art. Such modifications and adjustments fall within the scope of the present invention if they use the technical idea of the present invention.

The present invention can prevent the regurgitation of blood due to inconvenience due to the check of the residual amount and inadvertent blood upon completion of administration when injecting an infusion solution injected into a Ringer's bottle or a sack into the body. It is possible to provide a backflow prevention device for a fluid injector that can smoothly and conveniently infuse the fluid supply.

1 and 2 schematically show a conventional infusion dispenser,

3 is a longitudinal sectional view of a state in which a first embodiment according to the present invention is inserted into a drop portion;

4 is a cross-sectional view taken along line A-A of FIG.

5 is a cross-sectional view taken along line B-B of FIG.

6 is a cross-sectional view taken along line C-C of FIG.

7 is an exploded perspective view of the embodiment of FIG. 3, FIG.

8 is an exploded cross-sectional perspective view of the embodiment of FIG. 3;

9 is a sectional perspective view of the embodiment of FIG. 3;

10 shows step by step an operating state of the embodiment of FIG. 3,

11 is a longitudinal cross-sectional view of a modification example of the first embodiment in the state inserted into the drop portion;

12 is a sectional view taken along the line D-D of FIG. 11;

13 is an exploded cross-sectional perspective view of the embodiment of FIG. 11;

Fig. 14 is a longitudinal sectional view of the second embodiment of the present invention inserted into a drop portion;

15 is a cross-sectional view taken along line E-E of FIG. 14;

16 is a sectional view taken along the line F-F of FIG.

17 is a cross-sectional view taken along line G-G of FIG. 14;

18 is a sectional view taken along the line H-H of FIG. 14;

19 is a cross-sectional view taken along line II of FIG.

20 is a cross-sectional view taken along line J-J of FIG. 14;

21 is an exploded perspective view of the embodiment of FIG. 14;

22 is an exploded cross-sectional perspective view of the embodiment of FIG. 14;

FIG. 23 is a sectional perspective view of the embodiment of FIG. 14;

24 is a view for explaining an operating state of FIG. 14;

<Description of Symbols for Main Parts of Drawings>

100: fixed body 110: plotter accommodation space

111a: sap inlet 112a: auxiliary hole

120: valve body accommodating space 123: valve body

131: sap outflow passage

200: plotter 300: sheet packing

400: pressure member 500: ring-shaped elastic body

Claims (6)

In the infusion prevention device for infusion device for blood backflow prevention of the fluid injector configured to inject the fluid into the body through the needle: A plotter accommodating space is formed therein, a sap inlet is formed on the sidewall of the plotter accommodating space, and a sap outflow passage communicating with the plotter accommodating space is formed at the bottom thereof, and is coupled to the sap outlet of the drop portion of the sap dispenser at the bottom thereof. Fixing body protruding downward pipe-like insertion portion to be; A floater comprising a buoyancy generating unit which is moved up and down in the plotter accommodation space and a packing unit which is connected to the buoyancy generating unit to block the sap outflow passage when the buoyancy generating unit is lowered by the action of buoyancy; Backflow prevention device for fluid injector, characterized in that comprises a. delete The method of claim 1, A backflow preventing device for an infusion device, characterized in that the auxiliary hole is formed in the upper portion of the plotter accommodation space. The method of claim 3, wherein A valve body accommodating space in communication with the auxiliary hole is formed in the upper portion of the fixed body, and the valve body is provided in the valve body accommodating space so as to be raised or lowered according to a change in the flow rate of the fluid passing through the sap outflow passage. Backflow prevention device for fluid injector. The method of claim 1, The packing unit is a reverse flow prevention device for the sap dispenser, characterized in that the lower portion is conical. The method of claim 1, The sap outflow passage is divided into a first conveying part of the upper part and a second conveying part of the lower part along the flow direction of the sap, and a supporting jaw is formed at the end of the first conveying part; Located in the second transfer portion is provided with a sheet-shaped packing on the support jaw to support the upper portion of the edge; A pressurizing rod formed to push the central portion of the sheet-shaped packing toward the first transfer portion is provided, and a press member mounted on the second transfer portion is provided; Backflow prevention device for fluid injector, characterized in that.

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