TW469138B - Check valve and syringe using the same - Google Patents

Abstract

The present invention relates to a check valve which comprises the cylindrical body 11 in which the valve seat 13 having the injection flow hole 15 and the valve element 12 making contact with the valve seat 13 are disposed, wherein the valve element 12 is subjected to compressive deformation by the fluid pressure P applied from the upstream side U of the cylindrical body, so that the clearance 14 for flowing the injection D is formed in the direction (flowing direction y) that crosses the direction in which the fluid pressure P is applied to the valve element 12 (axial direction x); and a syringe using the same. Said syringe is capable of preventing the return flow of an injection containing a drug or the like and the inclusion of air in conjunction therewith.

Description

469138 V. Description of the invention (1) [Technical Field] The present invention relates to a valve for reverse flow and prevention of injection or injection circuit. [Technical background] It is common sense to depress the injection into the patient's internal tube or urinary catheter. However, the plunger will be depressed first from the injection. However, the above-mentioned routine depresses the plunger, and the gas is sucked in. Then the bubbles will be caused by the injection, which will cause serious distress. Clear the bubbles when it is necessary. A problem with elastic plastics is that the removal of blistering can be significantly more difficult than when injecting the injection. ——A kind of anti-reverse valve, which can prevent the action of containing air bubbles in the injection port and the plunger of an injection syringe, or the injection of the injection agent through these habits, usually completely removing the gas within the syringe. There is an interstitial bubble that cannot be completely removed and remains in the injection. When there is air bubbles with injections, medically called air bubble plugs, be cautious. (Injection container) 30, Valley Is body 31 and a slight large effect on the container when it is discharged, and the container has air bubbles, so the gas is cleared with drugs or the like. It is used in the end of the syringe. The reverse agent is injected directly from the syringe into the circuit and bubbled before dripping using the syringe. The problem is that if improper or outside air is injected into the blood vessel, the symptoms are blocked, so borrow the injection D from the syringe, as shown in Figure 7, the normal pressure changes, the strength of the recovery of the gas tends to cause bubbles. Great difficulty] The thrombus is formed in the urinary catheter connecting the blood vessels. The conventional method is to replace the substance with anticoagulant drugs such as heparin. but,.

89228009.ptd 469 1 38 V. Description of the invention (2) When the main shot anticoagulant is used, even a slight backflow to the syringe will cause the anticoagulant situation in the guide tube to be replaced by the returned blood. This is because it connects the blood vessels. The urinary catheter is a very thin tube, making anticoagulation useless. This problem is particularly noticeable in such a syringe when the injection D is discharged by flattening the container body 31 shown in FIG. 7 'because the injection D is easy to flow back due to the restoring force of the container body 3 丨. Therefore, various anti-reverse valves are set up to prevent the backflow of injections. A known anti-reverse valve of the prior art includes a valve member 81 mounted on a cylinder 80, and the flow path is opened when the valve member 81 is pressed by the hydraulic pressure p of the injection agent D acting from upstream (refer to FIG. 9), One has two valve members 82 (FIG. 10), one includes a conical valve seat 84, a spherical valve 85 and an adjustable protrusion 86, which is arranged in a cylinder 83 and the flow path is compressed by the hydraulic pressure P Spherical valve 85 was opened (Japanese Published Unexamined New Patent Application 'Case No. 58-120 74 8, refer to Figure I]), a type in which the flow path is opened, which is caused by hydraulic pressure upwards. The valve 89 is lifted, and it is pressed down to a valve seat 88 by a valve spring 87 (FIG. 12). However, among the anti-reverse valves of the prior art described above, as shown in Figs. 9, 10 and 11, the problem is that the injection D is returned to the original position after the valves 81, 82, and 85 are opened by the hydraulic pressure P. A small amount will flow back before closing the flow path. This problem is particularly apparent in the mechanism shown in Figs. Although the valve 85 in the mechanism shown in FIG. 11 has a very simple structure, it often fails when the flow path is closed, resulting in a return flow == constant, similar to the situation shown in circle 9 and FIG. 10.

Page 6 4 6 9 13 8 V. Description of the invention (3) On the other hand, in the mechanism shown in FIG. 12, the poppet valve 89 is pressed upward by the hydraulic pressure p, but quickly returns to the original position by the action of the valve spring 87. Therefore, the mechanism has a better effect of preventing backflow than that shown in FIG. 9 and FIG. 10. However, because the mechanism of the valve 89 is very complicated, it is difficult to obtain a product with stable quality, and the occurrence rate of defective products is also very high. The size of the valve 8 g is small and requires many parts, making it difficult and expensive to manufacture. Because of the above-mentioned bubble embolism, and the urinary catheter connected to the blood vessel contains a small amount of air bubbles or blood to cause a thrombus, more reliable tools are needed to prevent the backflow effect. [Summary of the invention] The present invention or the like can be used to achieve the purpose of preventing the positive and negative effects of the valve and the cylinder at the same time as the hydraulic pressure or the cylinder is installed in the valve structure gap. The injection of the material is to prevent the above-mentioned items, and all are positive injections. The direction of the valve member on the inner wall is immediate. The purpose of the injection is to prevent the injection, and the pressure is generated by the elastic injection. The cross-reflow flows back to the material of the present invention, shrinks into a seat or a round shot at the reverse valve, and the mid-stream is made with its anti-reverse. When subjected to deformation, gaps, and valve components of the cylinder At least one of the gas valves in the bubble is a compressed bubble on the inner wall of the injection from the cylinder in the valve structure. Including a component body upstream part and a valve agent flowing through 'which causes deformation and contains a medicine injection round carcass provided on the round side of the seat and / gap, hydraulically operated as described above of the present invention [J 大, g + dust under the' immediately Withstand compressive changes: When the structure 2 receives the upstream side of the fluid between the upstream side, the pressure is drawn by the syringe.

469 13 8 5 'Explanation of the invention (4) That is, when the hydraulic pressure acts from the upstream side of the cylinder, such as the deformation of the valve structure, can the valve member and the seat or the inner wall of the cylinder? The gap is compressed, and the injection is discharged downstream through the gap. 3 form a room When the load of the plunger is removed, the hydraulic pressure is stopped, and the gap is reduced as it was before. & when the valve member is facing the direction of: (ie, the direction in which the hydraulic pressure acts on the concrete member and the direction of injection flowing into the gap, intersect each other (preferably: two: in the prior art anti-reverse valve, the furnace is closed)杜 交 私 _ The direction of movement of the cow is the opposite of the flow of the liquid.) Following the movement, the helmet cuts back to I. Steam = plug: It is often simple, and the enterprise can return under the hydraulic pressure. Because of the field of spoon, especially,

I * physically present. b contact and f closed, when the hydraulic pressure; the gap will be page 8 \\ 326 \ 2d- \ 90-03 \ 89l28009.ptd 469 138 V. Description of the invention (5) — m Gan when the valve member faces the cylinder The downstream movement is engaged * stopped'and it comes into contact with the downstream side of the valve member. 2 ::: In a preferred aspect, the interpositional member is provided to have & dynamic contact with the inner wall of the cylinder, and one or more grooves are provided on the inner wall, and the axial extension of the body's groove is downstream of the cylinder Exposed inside the round branch body ^ The upstream part of the cylinder is closed by the valve member when it is not subjected to hydraulic pressure, and it is exposed by the cylinder when the Dong® 1 hydraulic pressure is applied, so a gap is formed between the valve member and the circle :: 7: A passage is created to make the injection flow, ^ stopped by the joint when the cylinder is downstream ... it and the valve :: the member moves to touch. The downstream part of the Danxing valve member is connected with the anti-reverse valve t in a better form. The valve member is in contact with the valve seat in the swimming and the downstream part of the cylinder is not moved downstream. Between joints: Hydraulic pressure applied upstream of the valve structure cylinder, which undergoes compression deformation. "、 Yu Yuan formed a gap between the valve structure and the valve seat when the hydraulic pressure acted on the valve structure of the first preferred aspect, so that the injection agent was discharged to the left-hand shot of the cylinder through the component agent flow hole and the gap on the valve seat. Return to the original appearance and time I: Minus when the moving hole is closed by the valve member. At this time, the Zhuang propellant flow® is the same as the direction of the valve member but the direction of the hydraulic pressure acting on the valve member to restore the original appearance. Intersection, so in the first preferred state "with the liquid master: Jian Liuliu is very reliably restrained from returning to the β body. In the second preferred aspect described above, the valve member should be under the cylinder 89128009.ptd Page 9 469 138 V. Description of the invention (6) ^ The main side of the swimming side is in contact with the joint, and the valve member will not move when the structure = Γ to create a sliding connection with the inner wall of the cylinder. 6 = The hydraulic pressure applied upstream and subjected to compression becomes hydraulic only: it is 'downstream' but fixed in a cylinder. When the member between the grooves formed by the inner wall is on the member, it is between the cylindrical member and the cylindrical body ;: 2 :: Exposed inside the cylindrical body ', and the C-gap is discharged through the slot through the radiator. Therefore, the injection pieces contained in the cylinder will resume the original opening; ::: you. When the hydraulic load is suppressed, the valve structure is reduced. Shape, so that the groove is closed downstream of the cylinder and the gap is =: 2 The valve member restores the original shape. The backflow of liquid in the sample will be very guilty. "Master, similar to the first preferred aspect. Shooting ^ ΐ Shooting theft 'includes the anti-reverse valve of the present invention and has a -note connection' or is in anti-reverse The cylinder ΐ-im ejector of the valve has a special shape like a syringe needle, the open end downstream of the body, or can be passed through if necessary; two: the; in the outer structure, the injection tool can directly ; Note: the open end of the device is integrally formed, or; the head is composed of the text. Putian saves the connection = the syringe of the present invention has the anti-radiation agent of the present invention is impossible to return or bubbles are sucked into the injection. injection

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The application in the medical field is regarded as a problem of entrapment into the aforementioned blood clot. W benefit will not cause 5. Description of the invention (7) The syringe of the present invention also has a hollow needle, the basin has a sharp end, and is connected to the valve body in the cylinder "on the inner wall on the upstream side of the round carcass, or connected to the valve In this case, the cylinder on the upstream side of the injection part on the upstream side of the seat. For example, when the syringe is sealed, the container opened on the upstream side of the cylinder can be filled with the injection container and the injection can be provided by the cylinder. The middle of the = is delivered without prior termination. One of the needles passes through the container. The syringe of the present invention also has an elastic plastic injection that moves freely and directly or indirectly. Injection container, Ϊ Open end》 Cylinder upstream open end 'or if necessary through a hollow connection [Description of the best mode of the present invention] Now the syringe and check valve of the present invention will be described in detail as follows [Check valve 】

The anti-reverse valve of the present invention includes (a) a cylinder 'and (dagger) a valve member as described above, which is made of an elastic material and is installed in the cylinder to close the flow path of the injection. The hydraulic pressure immediately undergoes compressive deformation to form a gap between the valve member and the valve seat and / or the inner wall of the cylinder. Installing a valve member and a valve seat and / or a cylinder inner wall in the anti-reverse valve causes a direction in which the hydraulic pressure acts on the valve member and a direction in which the injection agent flows into the gap when the valve member is compressed and deformed D

4 69 138 V. Description of the invention (8) [First preferred aspect] The specific examples shown in Fig. 1 to Fig. 3 are specific examples based on the / first preferred aspect. Fig. 1 is a partially cut-away perspective view showing a specific example of a reverse valve according to the present invention, and Fig. 1a shows a state where no hydraulic pressure is applied from the upstream side U of the cylinder to the valve member 12 'and Fig. 1b shows a hydraulic P implementation Of the state. Fig. 2 is a cross-sectional view of the check valve 10 shown in Fig. 1a, Fig. 2a shows a cross-sectional view taken along line A-A, and Fig. 2b shows a cross-sectional view taken along line B-B. Fig. 3 is a longitudinal sectional view of the anti-reverse valve 10 shown in Figs. 1a and 1b. Fig. 3a shows a state where the hydraulic pressure is not applied to the valve member 12 from the upstream side of the cylinder, and Fig. 3b shows The state of implementation of hydraulic pressure P. Each longitudinal sectional view of Fig. 3 is a sectional view taken along the line C-C in Fig. 2 & The anti-reverse valve shown in FIGS. 1 to 3 has a structure in which a valve member 12 made of an elastic material is installed and is in contact with a valve seat 13 in a cylinder U, and is an injection D (not shown in FIG. 1a). ) To form a passage as shown in Fig. 3 &. Therefore, the movement of the intermediate member 1 2 toward the downstream side L (the side where the injection D flows) is affected by the stop of α 6 and it is downstream of the cylinder with the valve member 丨 2 Side connection $ pi # & — At this moment, it is subjected to compressive deformation and is itself connected to the valve seat 1 3 injection two agents six seconds ^ gap 丨 4 'This time when connected as shown in Figure 7 From this: the industrial office syringe) 30 to the upstream open end 11U of the cylinder 11 = =: =: Generate hydraulic pressure p, or connect the pressure of the injection valve member 12 shown in FIG. 8 and generate a liquid jet by the plunger 51. $ Difficulty deformation adopts the state in Figure lb and Figure 3b.

469 138

The valve member 12 is subjected to compressive deformation under the load of hydraulic pressure p acting on the upstream side u of the cylinder. At this time, a gap is formed between the valve member 12 and the valve seat 3, and therefore, the injection agent flows through the injection hole 15 and the gap 14 And can inject 1). When the hydraulic P load on the valve member 12 is removed, the valve member 丨 2 returns to its original shape (the state shown in Figures U and 3a) and the gap 14 is reduced, while the injection flow hole 15 is closed by the valve member 12 . The direction of the hydraulic pressure p acting on the valve member 2 is consistent with the direction of the compressive deformation of the valve member 2 and the direction in which the valve member 2 returns to its original shape (the x-axis direction). On the other hand, the injection direction γ (see FIG. 3b) flowing into the gap 14 caused by the compressive deformation of the valve member 丨 2 does not coincide with the direction of the hydraulic pressure P applied to the valve member 2 but crosses it. This direction (is better vertical, therefore, such problems often encountered in the prior art anti-reverse valve, that is, when the valve member 12 returns to its original shape & (position), the liquid flows back to the upstream, for example = The injection is extremely suppressed. Even when the injection flows back, the amount is very small. Therefore, the anti-reverse valve 10 shown in Figures Ϊ to 3 can reliably prevent the valve member 12 from accompanying during opening and closing. The anti-reverse valve shown in Fig. 1 to Fig. 3 has a hollow needle 8 and its sharp point 17 is located on the upstream side u of the round carcass and is located on the upstream side of the valve seat 3 The injection flow holes 15 communicate with each other. By setting ^ needles 18, the trough filled with injection can be opened at the distal end immediately before use, so the container filled with injections is inserted from the cylinder 1 and ^ The open end 1 1 ϋ is sealed (refer to Figure 7). Therefore, the air bubbles and microorganisms in the injection are restricted, and Into the anti-reverse valve convenience in use.

469 13 8

In the above-mentioned first preferred embodiment, the shape of a wing can also be jealous. In the second strategy, the joint portion 16 is not limited to the shape of the member 12 t τ shown in 圊 1, and is provided on the inner surface of the cylinder 11 to communicate with the valve. The connection Λ r ^. The shape Λ is in contact with the downstream side L of the valve member 12. The first preferred aspect of L] The system shown in Figure 4 to Figure ^^. The system is a tool that corresponds to the second preferred aspect. The present invention shows a partial cut of another specific example of the anti-reverse valve. 1 β 1 Figure 'where the state shown in Figure 4a is the hydraulic pressure of the cylinder upstream u ρ not wide member 22 'and Figure 4b shows the state of implementation of hydraulic pressure P. Fig. 5 is a cross-sectional view of the anti-reversal chamber 20, showing a cross-section taken along the line AA shown in Fig. 4a-Fig. 6 is a longitudinal cross-sectional view of the anti-reverse valve 20 shown in Figs. The hydraulic pressure ρ on the upstream side U of the cylinder is not applied to the valve member 22 (the state shown in the longitudinal sectional view of FIG. 4a), and 圊 6b shows the state where the hydraulic pressure P is implemented (that is, the longitudinal section shown in FIG. 4b) Show the status). Each longitudinal cross-sectional view of FIG. 6 is a cross-sectional view taken along line B-B in FIG. 5. The anti-reverse valve 20 shown in Figs. 4 to 6 has a structure in which a valve member 22 made of an elastic material is provided to make sliding contact with the inner wall 23 of the cylinder 21, and a path for the injection D is formed (as shown in Fig. 4a). (Not shown), as shown in Figures 4a and 6a. The movement of the valve member 22 toward the downstream side 1 of the cylinder (the side to which the injection D flows) is stopped by the joint (projection) 2 6, and it contacts the valve member 22 on the downstream side L of the cylinder β valve member 2 2 So that it immediately withstands compressive deformation,

89128009.ptd Page 14 469138 V. Description of the invention (11) A gap 24 is formed between the inner wall 23, when the hydraulic pressure P is exerted by the upstream side 11 of the cylinder 'especially when the injection container made of elastic plastic in FIG. 7 is connected (Syringe) 30 to the upstream open end 21 U of the cylinder 21 and flattening the container body 31 thereby pushing the hydraulic pressure P, or connecting the injection container 50 in FIG. 8 to the upstream open end 21 U and pushing the hydraulic pressure P by the plunger 51. The compressive deformation of the valve member 22 adopts the state shown in Figs. 4b and 6b. That is, when the valve member 22 undergoes compressive deformation under the hydraulic p load applied by the upstream side u of the cylinder, the proximal end 25U of the groove 25 (refer to FIGS. 4a and 6a) is exposed inside the cylinder, and then the valve member 22 A gap 24 is formed between the 22 and the inner wall 23 of the cylinder (especially the inner surface of the groove 25), so the injection D can be discharged through the gap 24. When the hydraulic P load on the valve member 22 is removed, the valve member 22 returns to its original shape (the state shown by circle 4a and Fig. 6a) and the gap 2 4 is reduced, while the proximal end 25U of the groove 25 is closed. The direction of the hydraulic pressure P acting on the valve member 22 is consistent with the direction of the compressive deformation of the valve member 22, and also the direction in which the valve member 22 returns to its original shape (the x-axis direction). On the other hand, the Υ direction (refer to FIG. 4b and FIG. 6b) means that the injection D flows into the gap 24 generated when the proximal end 25U of the groove 25 is exposed inside the inner surface of the cylinder, and it does not correspond to the hydraulic pressure p acting on the valve member 22. The direction is the same, but it crosses this direction (preferably vertical). Therefore, the anti-reverse valve body of the prior art, for example, when the valve member recovers the original injection, can be completely suppressed. The amount is also very small. Therefore, the problems encountered in the flow of opening and closing with the valve member 22 in Figures 4 to 6 are referred to when the shape (position) of the liquid in it flows back upstream, even when the injection D flows back. The shown anti-reversal time 20 can be extremely suppressed.

89128009.ptd Page 15 469 138 V. Description of the invention (2) In the above second preferred aspect, a joint 26 can also be set up in the upstream area. 'The valve member 22 can be restricted from facing the upstream side of the cylinder U exercise.

In the second preferred aspect t described above, the joint portions 26 and 26U are not limited to those shown in FIG. 4 and FIG. 6. The shape is convex, and the ribs may extend along the X direction of the cylinder 21. (Similar to the connection part shown in the figure!). The advantage of this type is that the connection part can be formed integrally with the cylinder 2], so it is simple and increases the strength of the cylinder 21. The connection parts 26 and 26U can also be sieve-like. The shape of the hole is "upstream" or "downstream" from the valve member 12. [Elastic material] = There is no limitation on the use of the material in the cymbal member to prevent the backlash of the present invention. For example, when the plunger of the syringe is pressed, it can be deformed and shot instantly. = Under the hydraulic pressure; if it is in the nature of the winning body, the material must maintain the shape to withstand the hydraulic pressure. For example, the elastic material is characterized by its very low hardness, such as natural rubber, silicone rubber, ^ is a special rubber showing colloid And rubber such as fluorinated rubber; plasticity examples of rubber, butadiene; and various thermoplastic plastic elastomers. Polyethylene and polypropylene are preferably used.… Plastic elastomers are especially thermoplastic elastomers Entity Example Polystyrene-6ene / Butene -Styrene isooctaene elastomers, such as styrene ^ butadiene-styrene isomeric molecular compound (SEBS), olefin-isoprene-styrene isomeric molecular polymerization (SBs) , SEBS of styrene butadiene diacid, styrene-ethylene / D; SIS ^, modified cis-associated styrene heterogeneous molecules < i 6 9 13 8 V. Description of the invention (13) Polymer (SEPS) , Styrene said_ Pain, and Molecules / Butene Isomers (SEB), and Ethylene-Ethylene /); Women's Hydrocarbon Elastomers such as Ethylene Diene Compounds (Liao Ester Elastomers; and Their Mixtures) ..., knife polymer; polyurethane does not have a limiting factor on the size of the elastomer. However, in the best aspect, the diameter of the elastomer is the first one above. Pa H? A tl is determined according to the inner diameter of the cylinder The length of the elastic body is determined by the anti-reverse valve. The position and length of the farmer is based on the position and length of the valve (that is, the valve member). It has a very large dimensional body. When compressed, the size of the body that transitions in the radial direction is too small. The possible stop of liquid flow. Therefore, the degree of elastic deformation of the elastomer is determined. In the above aspect, when the elastomer ( Can cause problems such as elastic expansion 'and thus block the groove. When the elasticity problem is the size of the compressive deformation is not enough to stop, the sensitivity of the compression elastic body to deformation under the hydraulic pressure should be carefully considered by the index such as the hardness of the elastomer, the tensile stress It is expressed by the coefficient of elasticity for compression. The hardness of the elastomer used in the present invention is measured in accordance with JIS A hardness (spring hardness Hs (type A)) and measured in accordance with JIS K630 5.2 " Spring hardness test / explained method ) And the calculation 'its better range is from 0 to 2 0, and more preferably from 0 to 10. When the hardness of the elastomer is higher than the above range, the elastomer may be too hard to be used in the hydraulic pressure Under deformation. In order for the elastomer to maintain its shape when no load is applied, the hardness should be higher than the minimum mentioned above. The tensile stress of the elastomer used in the present invention is calculated according to the tensile stress Migq (MPa) at 100% elongation (JIS κ 6251).

89128009.ptd Page 17 4 6 9 1 3 8 V. Description of the invention (14) 0.05 to 2.0 MPa, and more preferably 0.05 to 0.5 MPa. When the tensile stress of the elastomer is larger than the above range, the elastomer cannot be deformed under the hydraulic pressure < On the other hand, when the tensile stress of the elastomer is smaller than the above range, the elastomer may not be able to be removed after the hydraulic pressure is removed Restore the original shape. Elastic Zhao's compression value CS (%) (JIS K6301, at 70. <: measurement for 22 hours) is preferably 30 or less, when the elastomer is subjected to hydraulic pressure or repeated cycles of removal Will not be damaged. Elastomers can also be made from such materials, as long as the above characteristics are achieved, such as a bead material (with dispersed pores that do not leak liquid) or a material with additives to achieve the required characteristics. A special example of this type of material is the colloid of a commercially available silicone resin, potassium urethane, whose trade name is CHEMITEC GEL (manufactured by Chemitec Corporation) and added with multi-purpose additives. [Cylinder container] The present invention The anti-reverse valve cylindrical container is made of various plastics used in the syringes of the prior art. For example, the polyolefins are polyethylene, polypropylene or poly-methylpentylene (for example, manufactured by Mitsui Chemical Co., Ltd. Commercial name is π τρχ "); polycyclic olefins are ethylene-tetracyclododecene molecular polymers (for example, manufactured by Mitsui Chemical Company, whose trade name is Α ΑρΕΙ /), acrylonitrile-butadiene- Styrene molecular polymer (ABS); polyesters include polyvinyl naphthalate (PEN), polyethylene terephthalate (pET), or polyallyl ester; and benzene polymers include polyphenyl vulcanization物 （pps） The number, length and width of the injection passages provided inside the cylinder are different.

469 ^ 38 V. Description of the invention (15) Yu Xingyi ’s decision was to recruit more when the elastomer was subjected to the hydraulic pressure given by the upstream side, to prevent backflow of the injection and make it smoothly discharge the injection. The cylinder for manufacturing the anti-reverse valve of the present invention can be formed by injection molding or extrusion molding from the open end 1 1 U to the seat 13 of the upstream U of the cylinder. On the valve seat of the body 丨 3, and then place this together with the cylinder on the downstream open end} 丨 L side, also by injection molding, extrusion molding or other methods' using heat fusion, ultrasonic welding, assembly or other assembly Method construction (Reference circle 1 :), or it can be manufactured by injection molding or extrusion molding from the L downstream side of the cylinder, the opening, 21 L to the proximal end of the groove 2 5 2ϋ, and then The valve member 22 is inserted into the cylinder and the valve member 22 is brought into contact with the joint portion 26 provided on the inner wall 23 of the cylinder, and then the valve member 22 is placed at the upstream open end with the cylinder. Forming or other methods' constructed by heat melting, ultrasonic welding, Pei match or other assembly methods (refer to Figure 4). 〃 In addition to the above manufacturing methods, other applied methods are to form the entire cylinder with a single piece, and then the valve The component is inserted into the cylinder. [Syringe] The anti-reverse valve of the syringe of the present invention is as described above, and its injection tool is directly or indirectly connected to the downstream opening of the cylinder of the anti-reverse valve ^ The injection tool is integrated with the downstream open end of the cylinder of the anti-reverse valve A specific example shown in FIG. 7 and FIG. 8 is the injection of a Pei # anti-reverse valve. The main shot "shown with the above picture of the present invention" is shown in the syringe. Its structure is to use a direct injection container 30, which is closed when filled with the injection agent, and is pulled. King Jongnon King J is connected to the anti-reverse of the present invention.

The cylinder 10 of the valve 10 opens at the upstream end. * Injection: The design of the smart device 30 is intended to discharge the container body 31 by flattening the container body 31 to the shape shown by the dotted line in FIG. The advantages of the injection volume are that the injection can be discharged with fewer parts, the manufacturing is simple, and the sealed state can be kept tight when stored. The syringe shown in Fig. 7 can extremely limit the backflow of the injection. This is because of the invention The anti-reverse valve 10 is connected downstream of the injection container 30. In the syringe shown in FIG. 7, the 'injection container 30 may be connected to the upstream open end 11 借 by a joint, or it may be integrally formed with the upstream open end 11 ϋ. ^ The injection cymbal shown is configured such that the injection tool 41 has two open ends 21L 'downstream of the cylinder 21 connected to the anti-reverse valve 20 and the injection agent ηι is filled with the injection agent and closed' indirectly via a connector b U having a needle 61 Ground is connected to the upstream open end 2 1 u. The injection tool 41 can be indirectly connected to the downstream open end 21L ′ or integrally formed with the downstream open end 21L via a joint. The injection container 50 conveys the contents contained therein when the plunger 51 is depressed. Although the injection of the injection container 50 may cause the injection to flow back when the pressure on the plunger 51 is released, the syringe shown in FIG. 8 can extremely inhibit the injection. 'Because the anti-reverse valve 20 of the present invention is connected downstream of the container 50.' The main injection container 50 can be directly connected to the upstream open end 21U without inserting the connector 60 shown in FIG. 8. The connector 60 'shown in 8 has a needle 61 with the tip 62 pointing to the upstream side of the cylinder 2 11), when connecting the connector 60 to the inside of the round body

469 ^ 38 V. Description of the invention (17) Wherein, the tip end of the container 50 is opened immediately by using the needle 61 before using the syringe. This restricts the air bubbles or microorganisms in the injection and improves the convenience of using a check valve. The injectable trough device 50 can also be integrally formed with the upstream open end 21 u. [Injection tool] The injection tool used in the syringe of the present invention has no other limiting factors except that it is hollow. It may also be a double-ended needle or only a sharp needle at one end. The needle may also be made of metal or plastic. It depends on the application. If the injection needle is made of plastic, the injection tool can be directly connected to the anti-return valve cylinder of the present invention and integrally formed. In the syringe of the present invention, the injection container and the plunger may be similar to those used in the syringe of the prior art. The anti-return valve and syringe of the present invention are not limited to those described above, and may be designed differently depending on the extent to which the effects, functions, and purposes of the present invention cannot be compromised. The anti-reverse valve of the present invention can be used in addition to syringes for medical treatment, and can also be used in various kinds of II #% tools that need to prevent the injection agent from flowing back and the bubbles it contains. @ [Industrial use] As explained before, because the syringe of the present invention has the above-mentioned anti-reverse valve, I cannot return the injection agent or the air is sucked into the injection agent during use. Therefore, the syringe can be widely used in the medical field as A safe, main shooter will not cause the aforementioned trouble of bubble plugging. / [Description of component number]

469 1 38

V. Description of the invention (18) 10, 20 Anti-reverse valve 11 '21 Cylinder 11L, 21L Downstream open end 11U, 21U Upstream open end 12, 22 Valve member 13 Valve seat 14, 24 Gap 15 Injection agent flow hole 16, 26 Joint 23 Inner wall of cylinder 25 Slot 30 Elastic plastic container for injection 41 Injection tool 61 Needle 62 Tip D Injector L Downstream of cylinder P Hydraulic pressure (direction of hydraulic pressure) U Upstream side of cylinder JUL X Cylinder Axis direction Y Direction of injection flow 89128009.ptd Page 22 4 6 9 13 8

Fig. 1 is a perspective view showing a specific example of the anti-return valve according to the present invention, showing a partial cut-away perspective view, and Fig. 1a shows a state in which the hydraulic pressure is not applied from the upstream side U of the cylinder to the valve structure 'and Fig. 1b shows a state in which the hydraulic pressure p is implemented. Fig. 2 is a cross-sectional view of the anti-reverse valve shown in Fig. 1a. Fig. 2a shows a cross-sectional view along line A-A 'and Fig. 2b shows a cross-sectional view along line B-B. . Fig. 3 is a longitudinal sectional view of the anti-reverse valve shown in Figs. 1a and 丨 b. Fig. 仏 shows a state where no hydraulic pressure is applied to the valve member 2 from the upstream side U of the cylinder, and Fig. 3b shows the hydraulic pressure. ρ State of implementation. Fig. 4 is another specific example of the anti-reverse valve according to the present invention, showing a partial cut-away perspective view, Fig. 4a shows a state where no hydraulic pressure is applied from the upstream side U of the cylinder to the valve member 22, and Fig. 4b shows a hydraulic pressure p status of implementation. Fig. 5 is a cross-sectional view of a check valve 20, showing a cross-sectional view taken along line a-A shown in Fig. 4a. Fig. 6 is a longitudinal sectional view of the anti-reverse valve 20 shown in Figs. 4a and 4b. Fig. 6a shows a state where the hydraulic pressure is not applied to the valve member 22 from the upstream side U of the cylinder, and Fig. 6b shows the implementation of the hydraulic pressure p. Of the state. Fig. 7 is a plan view 'showing a specific example of a syringe equipped with a reverse valve of the present invention. Fig. 8 is a plan view showing another specific example of a syringe equipped with a reverse valve of the present invention. Fig. Θ is a longitudinal sectional view showing an example of a prior art anti-reverse valve. Fig. 10 is a longitudinal section 圊 showing an embodiment of a prior art anti-reverse valve. Fig. 11 is a longitudinal sectional view showing an embodiment of a prior art anti-reverse valve. Fig. 12 is a longitudinal sectional view showing an embodiment of a prior art anti-reverse valve.

89128009.ptd Page 23

Claims (1)

469138 VI. Application Patent Scope 1.—A kind of anti-reverse valve, which includes at least a cylinder and an elastic material, which includes: The valve members are all made of-• ΐί: Ϊ The injection passage can be closed on the cylinder ≫ 9 ^ Du i Immediately subjected to compressive deformation when hydraulic pressure is applied to the side of the limb ^ "piece" formed between the valve seat and / or the inner wall of the cylinder-a gap: the injection of the valve through the gap; and ' , Ｍ Official's liquid ί: Γ: = ί and / or the installation of the inner wall of the cylinder, the purpose of which is to flow through the gap in the direction of the shape and intersect with each other. Then the component in the field is compressed and changed = = 1 item 1 Anti-reverse valve, in which the seat should be in contact with an injection agent flow hole; First, the ejection motorized hole is opened when it is not subjected to the hydraulic pressure and the hydraulic pressure, thereby constituting: a flow path closed by the f-pieces ; And 4 the T-valve member formed between the member and the intermediate seat should be moved to the downstream side of the cylinder 接触 contact with the downstream side of the intermediate member. The leather is stopped, and its 3 'is the anti-reverse 1 according to the scope of the patent application 1 Structure: cattle can have sliding contact with the inner wall of the round plug; The cylinder has __ 指 $ & 私 _. If #, and is formed on the inner surface of the cylinder, extending along the axis of the cylinder. The groove is exposed to Yuanzhi on the downstream side of the circular prism. * Even when the swim side is not subjected to the hydraulic pressure = within 'on the round carcass = exposed to the circle ... so the valve = two constitutes-a gap, thereby forming one for the injection = cattle: "between the inner walls 4 69 13 8 6. Scope of patent application The valve member is stopped by a joint when it is moved downstream of the cylinder, and then contacts the downstream side of the valve member. /, 4 · The anti-reverse valve according to item 1 of the patent application range, wherein the valve member is molded of a thermoplastic elastomer. 5. For the anti-reverse valve in the scope of the patent application, the JIS A hardness value of the valve member ranges from 0 to 20. 6. The anti-reverse valve according to item 4 of the patent application range, wherein the tensile stress value of the valve member ranges from 0.0 to 2. OJlPa. 7. The anti-reverse valve according to item 4 of the patent application, wherein the compression group value of the valve member is 30 or less. Item 1 to 7 of 8. — A syringe anti-backlash, including: ΤΓ is 5 shots and 3 workers, which is directly or indirectly connected to the downstream opening of the cylinder of the anti-backup valve, or the injection tool is integrated with it forming. 9. For example, the syringe of the scope of patent application No. 8 in which-the head has a sharp tip on the upstream side of the cylinder, and ## 心 夕 w It connects the valve operating hole in the round body. The flow of injectable agent on the upstream side of the Fei Dian connection valve seat 10. As for the syringe in the scope of patent application No. 8 or 9, an elastic plastic device can be installed freely and directly or indirectly on the upstream open end of the cylinder.