A prefilled catheter flusher

Abstract

The present invention provides a prefilled catheter flusher, comprising: an at least partially deformable liquid reservoir 1, provided with an injection port 10. A pressure-applying device 2 is provided at one end of the injection port 10, capable of sealing the injection port 10 from the outside of the reservoir 1. When the pressure of the flushing liquid reaches or exceeds a predetermined value due to deformation of the reservoir 1, the flushing liquid overcomes the resistance applied to the injection port 10 by the pressure-applying device 2, achieving flushing. The prefilled catheter flusher of the present invention not only prevents the flushing liquid from flowing back into the liquid reservoir lumen 11, but also does not contact the pressure-applying device 2 with the flushing liquid, thus requiring lower material requirements. This reduces manufacturing costs and simplifies the production process, making it safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a prefilled catheter flusher for catheter flushing. Background Art

[0002] Intravenous catheters are widely used in clinical practice, such as intravenous catheters and PICCs. Sealing the tube is one of the important links in the successful application of intravenous catheters, and sealing fluid is the key to keeping the tube unobstructed. As a new type of sealing fluid, the prefilled catheter flusher can replace traditional sealing fluids such as physiological saline and heparin diluent. However, in the prefilled catheter flusher based on the existing patent, there is a problem that the compressed part of the liquid storage container rebounds, causing the flushing fluid to flow back into the liquid storage cavity, and then causing blood to flow back into the catheter cavity, resulting in catheter blockage. In order to solve the above problems, the prefilled catheter flusher in the existing patent technology is provided with a one-way valve at one end of the injection port of the liquid storage container to prevent the flushing fluid from flowing back into the liquid storage cavity. Since the above-mentioned one-way valve is provided in the liquid storage cavity and is in direct contact with the flushing fluid, the material requirements for the one-way valve are relatively high, which not only increases the manufacturing cost of the product, but also brings a greater economic burden to the patient, and also poses a safety hazard.

[0003] Therefore, those skilled in the art are in urgent need of developing a prefilled catheter flusher that is simple in structure, easy to operate, low in manufacturing cost, and safe and reliable to use. Summary of the Invention

[0004] The present invention provides a prefilled catheter flusher which has a simple structure, is easy to operate, has a low manufacturing cost, and is safe and reliable to use.

[0005] The present invention provides a prefilled catheter flusher, comprising: an at least partially deformable liquid storage container, the liquid storage container being provided with an injection port, and a pressure-applying device at one end of the injection port being capable of closing the injection port from the outside of the liquid storage container. When the pressure of the flushing liquid reaches or exceeds a predetermined value due to deformation of the liquid storage container, the flushing liquid overcomes the resistance applied to the injection port by the pressure-applying device to achieve flushing.

[0006] Preferably, the injection port is sealed and fixed with a connecting joint, which is used to connect to the connecting joint of the flushed pipeline. One end of the connecting joint is provided with a liquid inlet, and the other end is provided with a liquid outlet. The side wall of the connecting joint is provided with a pressure port. The pressure port, the liquid inlet and the liquid outlet are connected to each other. The pressure device acts on the inner cavity wall of the connecting joint through the pressure port, so that the communication between the liquid inlet and the liquid outlet is blocked and the injection port is closed.

[0007] Preferably, the container wall of the liquid storage container covering the pressure port is recessed inward to form a hemispherical recess or the pressure port is provided with a sealing membrane recessed inward to form a hemispherical recess, the outer wall of the pressure device extends outward to form a hemispherical protrusion, the hemispherical recess is conformal to the hemispherical protrusion, and after the hemispherical protrusion passes through the pressure port, it is pressed against the inner cavity wall of the connecting joint through the hemispherical recess.

[0008] Preferably, the injection port is sealed and fixed with a connecting joint, which is used to connect to the connecting joint of the flushed pipeline. The pressure-applying device acts on the outer wall of the liquid storage container to make the inner walls of the liquid storage container fit together to close the injection port.

[0009] Preferably, the pressure device includes two pressure components, one end of which is fixed to the connecting joint, and the other end acts on the opposite sides of the outer wall of the liquid storage container, so that the inner walls of the liquid storage container fit together to close the injection port.

[0010] Preferably, it also includes a sealing component, which seals the injection port. The sealing component is a cover-like structure with one end closed and the other end open. The open end of the sealing component is sleeved on the outer wall of the connecting joint, and the closed end of the sealing component is provided with an easily foldable part. The pressure-applying device includes two pressure-applying components, one end of the two pressure-applying components is formed or fixed on opposite sides of the outer wall of the open end of the sealing component, and the other end acts on the outer wall of the liquid storage container, so that the inner walls of the liquid storage container fit together to close the injection port.

[0011] Preferably, the pressure-applying device is an elastic clip, and the clamping portion of the elastic clip is clamped on the outer wall of the liquid storage container, so that the inner walls of the liquid storage container fit together to close the injection port.

[0012] Preferably, the injection port is sealed and fixed with a connecting joint, which is used to connect to the connecting joint of the flushed pipeline. The connecting joint is provided with a liquid outlet and a liquid inlet that are interconnected. The liquid inlet is provided on the side wall of the connecting joint. The liquid outlet is connected to the connecting joint of the flushed pipeline, and the liquid inlet is connected to the liquid storage container. The pressure device acts on the liquid inlet to close the injection port.

[0013] Preferably, the pressure-applying device acts on the liquid inlet by magnetic attraction to close the injection port; or, the pressure-applying device acts on the liquid inlet by mechanical structure to close the injection port; or, the pressure-applying device acts on the liquid inlet by elastic tension to close the injection port.

[0014] Preferably, the pressure-applying device is a pressure rod structure, one end of the pressure-applying device is fixed to the connecting joint, and the other end is pressed against the liquid inlet.

[0015] Preferably, it further comprises a sealing component, which seals the injection port.

[0016] Preferably, the sealing component is a cover-like structure with one end closed and the other end open, the open end of the sealing component is sleeved on the outer wall of the connecting joint, and the closed end of the sealing component is provided with an easily foldable portion.

[0017] Preferably, the pressure-applying device is a pressure rod structure, one end of the pressure-applying device is formed on or fixed to the outer wall of the opening end of the sealing component, and the other end is pressed against the liquid inlet.

[0018] Preferably, the sealing method between the pressure-applying device and the periphery of the liquid inlet is a surface-to-surface compression seal; or, the sealing method between the pressure-applying device and the periphery of the liquid inlet is an annular protrusion-to-surface compression seal; or, the pressure-applying device and the periphery of the liquid inlet are sealed by a sealing component.

[0019] Preferably, the pressure device is provided with a bending section and a hook / slot, the wall thickness of the bending section is smaller than the wall thickness of the pressure device excluding the bending section, and the connecting joint is provided with a slot / hook that engages with the hook / slot; or, the pressure device is hingedly connected to the connecting joint, the pressure device is provided with a slot / hook, and the connecting joint is provided with a hook / slot that engages with the slot / hook; or, the pressure device is elastically hinged to the connecting joint.

[0020] Preferably, the pressure-applying device is an elastic clip, and the clamping portion of the elastic clip is clamped on the liquid inlet to close the injection port.

[0021] Beneficial effects

[0022] First, the prefilled catheter flusher of the present invention achieves flushing by deforming the liquid storage container so that the flushing liquid overcomes the resistance applied to the injection port by the pressure-applying device. After flushing is completed, the pressure-applying device can prevent the flushing liquid from flowing back into the liquid storage cavity. Moreover, because the pressure-applying device seals the injection port through the exterior of the liquid storage container, the pressure-applying device does not contact the flushing liquid. Therefore, the material requirements for the pressure-applying device are relatively low, which not only reduces the product manufacturing cost but also simplifies the product production process, making it safer and more reliable to use.

[0023] Second, the pressure-applying device in the present invention can have multiple action positions. The pressure-applying device can act on the outer wall of the container at one end of the injection port of the liquid storage container, so that the container wall fits and closes the injection port. It has a simple structure, low manufacturing cost, and simple assembly process; or, the injection port is sealed and fixed with a connecting joint made of a hard material, and the pressure-applying device can act on the outer wall of the container near one end of the connecting joint of the liquid storage container, and the connecting joint made of a hard material is lined with the inner wall of the container of the liquid storage container between the injection port and the pressure-applying device, effectively preventing the container wall of the liquid storage container between the pressure-applying device and the injection port from deforming, causing the flushing liquid to flow back, and then causing blood to flow back into the catheter cavity, resulting in catheter blockage; or, the side wall of the connecting joint near one end of the injection port is provided with a liquid inlet, and the pressure-applying device can act on the liquid inlet to close the injection port, which not only makes it convenient for the pressure-applying device to apply resistance to the liquid inlet, but also reduces the area where the liquid storage container between the pressure-applying device and the injection port is deformed.

[0024] Third, the pressure-applying device in the present invention has various forms. The pressure-applying device can act on the liquid inlet by magnetic attraction, which has a simple structure and is easy to implement; or, the pressure-applying device can act on the liquid inlet by mechanical structure, which has low manufacturing cost, good stability, safety and reliability, and is easy to mass produce; or, the pressure-applying device can act on the liquid inlet by elastic tensioning, which has a simple structure, low manufacturing cost, and simple assembly process.

[0025] Fourth, the mechanical structure of the pressure device in the present invention is diverse. The pressure device can be a pressure rod structure or two pressure components, which are integrally formed with the connecting joint. It has a simple structure, a simple assembly process, and a low manufacturing cost. The above-mentioned pressure device can be in an open state before use, and in a closed state when in use to act on the liquid inlet; or the above-mentioned pressure device can also be separately formed from the connecting joint, and the pressure device and the connecting joint are assembled and connected when in use, which not only reduces product fatigue loss, ensures product performance, but also extends product service life. The above-mentioned pressure device can be an elastic clip, and when in use, the clamping part of the elastic clip is clamped on the outer wall of the container of the liquid storage container; or when in use, the clamping part of the elastic clip is clamped on the liquid inlet, which also reduces product fatigue loss, ensures product performance, and extends product service life.

[0026] Fifth, the sealing method between the pressure-applying device and the periphery of the liquid inlet in the present invention is various, and can be surface-to-surface compression sealing, annular protrusion-to-surface compression sealing, or sealing through a sealing component, which is more tight and effectively prevents liquid leakage.

[0027] Sixth, the present invention has a sealing member for sealing the injection port, which prevents the flushing liquid in the liquid storage cavity from leaking from the injection port. In addition, one end of the pressure-applying device is formed or fixed to the sealing member, which facilitates product molding and reduces product manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : A full cross-sectional view of the two pressure-applying components of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention;

[0029] Figure 2 : A structural view of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention, which comprises two pressure-applying components;

[0030] Figure 3 : A fully exploded view of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention, showing a pressure rod structure;

[0031] Figure 4 : A full cross-sectional view of a pressure rod structure of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention;

[0032] Figure 5 : A partial cross-sectional view of the flushing liquid of the prefilled catheter flusher according to the first embodiment of the present invention overcoming the resistance of the pressure-applying device to achieve flushing;

[0033] Figure 6 : A partial cross-sectional view of the engagement between the clamping groove of the pressure-applying device and the clamping hook of the sealing component of the prefilled catheter flusher according to the first embodiment of the present invention;

[0034] Figure 7 : A structural view of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention in an open state;

[0035] Figure 8 : A partial cross-sectional view of the engagement between the hook of the pressure-applying device and the slot of the sealing component of the prefilled catheter flusher according to the first embodiment of the present invention;

[0036] Figure 9 : A partial cross-sectional view of the engagement between two hooks of the sealing component and two grooves of the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention;

[0037] Figure 10 : A structural view of the engagement between the U-shaped ferrule of the pressure-applying device and the sealing component of the prefilled catheter flusher according to the first embodiment of the present invention;

[0038] Figure 11 : A structural view of the sliding engagement between the slide rail of the pressure-applying device and the slide groove of the sealing component of the prefilled catheter flusher according to the first embodiment of the present invention;

[0039] Figure 12: A partial structural view of the elastic hinged connection between the pressure-applying device and the sealing member of the prefilled catheter flusher according to the first embodiment of the present invention;

[0040] Figure 13 : A partial cross-sectional view of a prefilled catheter flusher according to a first embodiment of the present invention, wherein the pressure-applying device is a split elastic clip;

[0041] Figure 14 : A structural view of a split elastic clip in which the pressure-applying device of the prefilled catheter flusher according to the first embodiment of the present invention is formed;

[0042] Figure 15 : A partial cross-sectional view of a prefilled catheter flusher according to a first embodiment of the present invention, wherein the pressure-applying device is an integrated elastic clip;

[0043] Figure 16 : A structural view of the pressure-applying device of the prefilled catheter flusher according to the second embodiment of the present invention, which uses magnetic force to close the injection port;

[0044] Figure 17 : A structural view of a prefilled catheter flusher according to a third embodiment of the present invention, in which the pressure-applying device acts on the outside of the liquid storage container by means of elastic tension;

[0045] Figure 18 : A structural view of a prefilled catheter flusher according to a third embodiment of the present invention, in which the pressure-applying device acts on the liquid inlet in a spring-tightening manner;

[0046] Figure 19 : A structural view of the pressure-applying device of the prefilled catheter flusher according to embodiment 4 of the present invention, in which the pressure-applying device acts on the inner cavity wall of the connecting joint through the pressure-applying port.

[0047] 1. Liquid storage container; 10. Injection port; 11. Liquid storage cavity; 12. Container wall; 2. Pressure device; 20. Connecting portion; 201. Bending section; 202. Annular ferrule; 203. U-shaped ferrule; 204. Slide rail; 205. First support; 21. Pressure portion; 211. Hemispherical protrusion; 22. First connecting component; 221. First pin; 222. First torsion spring; 23. Clamping component; 231. Clamping portion; 232. Grip; 233. Pin support; 234. Bending portion; 24 .Second connecting component; 241. Second pin; 242. Second torsion spring; 25. Pressure component; 3. Connecting joint; 30. Liquid pipeline; 31. Liquid inlet; 32. Liquid outlet; 33. Pipe wall; 331. Limiting platform; 34. Clamping ring; 341. Internal thread; 35. Pressure port; 4. Hook; 5. Slot; 6. Sealing component; 61. Open end; 62. Closed end; 63. Foldable part; 64. Slide; 65. Second support; 7. Annular protrusion; 8. Sealing component; 9. Elastic component. DETAILED DESCRIPTION

[0048] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present disclosure, as detailed in the claims.

[0049] The present invention provides a prefilled catheter flusher. A first embodiment of the prefilled catheter flusher provided by the present invention is described below.

[0050] like Figure 1 and Figure 2 A prefilled catheter flusher is shown. The device includes a fluid reservoir 1 prefilled with flushing fluid. The fluid reservoir 1 has a container wall 12, at least partially deformable, made of a flexible medical plastic material. Preferably, the fluid reservoir 1 is made of medical-grade PP for easy deformation and low resilience. The container wall 12 encloses a fluid reservoir cavity 11, which is prefilled with flushing fluid. The container wall 12 defines an injection port 10, through which the flushing fluid is injected. A pressure device 2 is provided at one end of the injection port 10 of the fluid reservoir 1. The pressure device 2 acts on the outer wall of the fluid reservoir 1, forcing the inner wall of the fluid reservoir 1 to conform to each other and seal the injection port 10. During use, when the flushing fluid pressure reaches or exceeds a predetermined value due to deformation of the fluid reservoir 1, the flushing fluid overcomes the resistance applied by the pressure device 2 to the injection port 10, achieving flushing. Deforming the liquid storage container 1 refers to applying a certain external force to the liquid storage container 1 to cause deformation, which can specifically be achieved through squeezing, pressing, or other methods. The predetermined value is specifically set to a value greater than the human venous pressure, while also being limited to a value that would increase the difficulty of flushing and injection. The preferred range of the predetermined value is 1.5 kPa-1 MPa. The specific value of the predetermined value is determined based on the material selection, structure, and other parameters of the liquid storage container 1 and is not specifically limited herein.

[0051] Continue to refer Figure 1 and Figure 2In order to prevent the liquid storage container 1 between the pressure-applying device 2 and the injection port 10 from deforming, causing the flushing liquid to flow back, and then causing blood to flow back into the catheter lumen, resulting in catheter blockage, the injection port 10 is sealed and fixed with a connecting joint 3. The pressure-applying device 2 acts on the outer wall of the liquid storage container 1 near one end of the connecting joint 3. The connecting joint 3 is made of a hard medical plastic injection molded material. The hard connecting joint 3 is lined with the inner wall of the liquid storage container 1 between the pressure-applying device 2 and the injection port 10, thereby preventing the liquid storage container 1 between the pressure-applying device 2 and the injection port 10 from deforming. The above-mentioned connecting joint 3 includes a liquid inlet 31, a liquid outlet 32 and a pipe wall 33. The pipe wall 33 encloses a liquid pipe 30. The end of the connecting joint of the liquid pipe 30 connected to the flushed pipeline is the liquid outlet 32, and the end extending into the liquid storage cavity 11 is the liquid inlet 31. Specifically, the flushed pipeline can be an indwelling needle, PICC or other equipment that needs flushing; the connecting joint 3 can be a Luer joint or other types of connecting joints, and its specific structure can be specifically designed to match the flushing equipment it is connected to. In order to facilitate the connection between the connecting joint 3 and the connecting joint of the flushed pipeline, the outer wall of the connecting joint 3 extends along its axial direction toward the liquid outlet 32 to form a clamping ring 34, and the inner wall of the clamping ring 34 is provided with an internal thread 341 that matches the thread of the connecting joint of the flushed pipeline. Continue to refer to Figure 1 The pressure-applying device 2 utilizes a mechanical structure to act on the outer wall of the liquid storage container 1, so that the inner walls of the liquid storage container 1 fit together and close the injection port 10. Specifically, the pressure-applying device 2 includes two pressure-applying components 25, and the two pressure-applying components 25 are distributed on both sides of the outer wall of the connecting joint 3. The pressure-applying device 2 has a connecting portion 20 connected to the connecting joint 3, and a pressure-applying portion 21 clamped on opposite sides of the outer wall of the liquid storage container 1. The pressure-applying portion 21 is in the shape of a splint, and the whole is pressed against the outer wall of the liquid storage container 1, so that the closure is firm and the product is easy to implement. In order to facilitate the fixing of the pressure-applying device 2 to the outer wall of the connecting joint 3, the outer wall of the connecting portion 20 extends outward to form an annular clamping sleeve 202, and the annular clamping sleeve 202 is clamped on the outer wall of the connecting joint 3. Alternatively, the pressure portions 21 of the two pressure members 25 may be configured such that one pressure member 25 is provided with a clamping groove and the other is provided with a clamping protrusion. The clamping groove and the clamping protrusion cooperate to clamp the container 1 on opposite sides of the outer wall of the liquid storage container 1, providing a more secure clamp. In this embodiment, the pressure device 2 may also employ other mechanical structures, as long as the pressure device 2 compresses the container wall 12 from the outer wall of the liquid storage container 1 to seal the injection port 10.

[0052] like Figure 3 and Figure 4As shown, preferably, in order to reduce the deformation area of the liquid storage container 1 between the pressure device 2 and the injection port 10, the pressure device 2 applies resistance to the liquid inlet 31 at one end of the connecting joint 3 close to the injection port 10. In order to facilitate the pressure device 2 to apply resistance to the liquid inlet 31 of the connecting joint 3, the liquid inlet 31 is set on the side wall of the connecting joint 3. The pressure device 2 is a pressure rod structure, and the pressure part 21 as a whole is pressed against one end of the liquid inlet 31. The assembly process is simple and the connection is convenient and fast. In order to ensure the sealing between the pressure part 21 and the liquid inlet 31, the pressure part 21 and the outer periphery of the liquid inlet 31 are sealed by surface-to-surface compression.

[0053] like Figure 3 、 Figure 4 and Figure 5 As shown, to prevent liquid leakage before use, the device further includes a sealing member 6, which seals the injection port 10. The sealing member 6 is a cap-shaped structure, with a closed end 62 at one end and an open end 61 at the other end. The closed end 62 of the sealing member 6 is provided with a breakable portion 63, and the open end 61 is welded to the outer wall of the connecting joint 3 using a heat-sealing process. Preferably, the wall thickness of the sealing member 6 is locally thinned to form the breakable portion 63. When in use, first hold the closed end 62 of the sealing component 6 with your hand, and apply force to pull the closed end 62 of the sealing component 6 to break it along the easily broken part 63. At this time, the open end 61 of the sealing component 6 continues to remain on the outer wall of the connecting joint 3, and the liquid outlet 32 is connected to the outside world. Then squeeze the liquid storage container 1 with your hand to make it deformed. At this time, the flushing liquid pressure in the liquid storage cavity 11 gradually increases until the flushing liquid pressure reaches or exceeds the predetermined value. The flushing liquid overcomes the resistance applied to the injection port 10 by the pressure device 2 and flushing is achieved. In order to make the product easy to shape, the pressure device 2 is integrally formed with the open end 61 of the sealing component 6. The pressure device 2 is the outer wall of the open end 61 of the sealing component 6 extending along its axial direction toward the liquid inlet 31 to form a pressure rod. It has a simple structure, simplifies the assembly process, and reduces the manufacturing cost of the product. Continue to refer to Figure 4 and Figure 5 The outer wall of the connecting joint 3 protrudes outward to form an annular limit platform 331. The limit platform 331 limits the depth of the sealing component 6 connected to the outer wall of the connecting joint 3, which facilitates positioning and assembly.

[0054] like Figure 12As shown, in order to ensure the durability and stability of the pressure-applying portion 21 of the pressure-applying device 2 pressing against the liquid inlet 31, the connecting portion 20 of the pressure-applying device 2 is elastically hinged to the sealing member 6 via a first connecting component 22. Specifically, the first connecting component 22 includes a first pin 221 and a first torsion spring 222. The inner sidewall of the connecting portion 20 of the pressure-applying device 2 extends outward to form two symmetrical first supports 205, and the outer sidewall of the sealing member 6 extends outward to form two symmetrical second supports 65. The first pin 221 is hinged to the first support 205 and the second support 65, respectively. The first pin 221 is hinged to a first torsion spring 222, which is compressed between the connecting portion 20 and the sealing member 6, causing the pressure-applying portion 21 of the pressure-applying device 2 to be in an elastically closed state and pressed against the liquid inlet 31. In this specific embodiment, because the first torsion spring 222 is hinged to the first pin 221, an elastic hinge is formed between the connecting portion 20 and the sealing member 6.

[0055] like Figure 7 As shown, in order to reduce product fatigue loss, ensure product performance, extend product service life, and prevent product parts from being lost, the pressure device 2 is in an open state before use, and the connecting portion 20 of the pressure device 2 has a bending section 201 that can be bent. The wall thickness of the bending section 201 is smaller than the wall thickness of the pressure device 2 other than the bending section 201, which is conducive to the bending of the pressure device 2. The inner side wall of the pressure device 2 extends outward to form a hook 4, and the outer side wall of the opening end 61 of the sealing component 6 extends outward to form a slot 5. Optionally, the connecting portion 20 of the pressure device 2 has a bending section 201 that can be bent, and the inner side wall of the pressure device 2 extends outward to form a slot 5, and the outer side wall of the opening end 61 of the sealing component 6 extends outward to form a hook 4. As shown Figure 8 As shown, when in use, first rotate the pressure-applying portion 21 of the pressure-applying device 2 from the liquid outlet 32 end of the connecting joint 3 to the liquid inlet 31 end of the connecting joint 3 in a clockwise direction, and then engage the hook 4 with the slot 5 to fix the pressure-applying device 2 to the outer wall of the opening end 61 of the sealing member 6. Figure 8 Optionally, in order to increase the sealing between the pressure-applying part 21 and the liquid inlet 31, a sealing component 8 is embedded in the inner wall of the pressure-applying part 21. The sealing component 8 is a sealing gasket, and the pressure-applying part 21 is sealed with the outer periphery of the liquid inlet 31 through the sealing component 8.

[0056] like Figure 6As shown, optionally, the connection portion 20 of the pressure-applying device 2 is hinged to the outer side wall of the open end 61 of the sealing component 6, the outer side wall of the open end 61 of the sealing component 6 extends outward to form a hook 4, and the connection portion 20 of the pressure-applying device 2 penetrates to form a slot 5. Optionally, the connection portion 20 of the pressure-applying device 2 is hinged to the outer side wall of the open end 61 of the sealing component 6, the outer side wall of the open end 61 of the sealing component 6 extends outward to form a slot 5, and the inner side wall of the connection portion 20 of the pressure-applying device 2 extends outward to form a hook 4. When in use, the pressure-applying portion 21 of the pressure-applying device 2 is rotated clockwise from the liquid outlet 32 end of the connecting joint 3 to the liquid inlet 31 end of the connecting joint 3, and then the hook 4 is engaged with the slot 5 to fix the pressure-applying device 2 to the outer side wall of the open end 61 of the sealing component 6. Continue to refer to Figure 6 Optionally, in order to reduce parts, simplify the assembly process, and reduce product manufacturing costs, the inner side wall of the pressure-applying portion 21 protrudes outward to form an annular protrusion 7, and the pressure-applying portion 21 is pressed against the outer circumference of the liquid inlet 31 by the annular protrusion 7 to seal. Optionally, the outer circumference of the liquid inlet 31 protrudes outward to form an annular protrusion 7, and the outer circumference of the liquid inlet 31 is pressed against the inner side surface of the pressure-applying portion 21 by the annular protrusion 7 to seal.

[0057] like Figure 9 As shown, optionally, the pressure device 2 can also be formed separately from the open end 61 of the sealing component 6, and the outer side wall of the open end 61 of the sealing component 6 extends outward to form two symmetrical hooks 4, and the connecting portion 20 of the pressure device 2 penetrates to form two symmetrical slots 5. When in use, the hooks 4 are engaged with the slots 5 to fix the pressure device 2 to the outer side wall of the open end 61 of the sealing component 6. Figure 9 In order to save materials, a sealing component 8 is embedded in the inner wall of the pressure-applying portion 21. The sealing component 8 is a sealing gasket. The pressure-applying portion 21 is sealed with the outer periphery of the liquid inlet 31 through the sealing component 8. Optionally, a sealing component 8 is embedded in the outer periphery of the liquid inlet 31. The sealing component 8 is a sealing gasket. The outer periphery of the liquid inlet 31 is sealed with the inner side surface of the pressure-applying portion 21 through the sealing component 8.

[0058] like Figure 10 As shown, optionally, the inner side wall of the connecting portion 20 of the pressure-applying device 2 extends outward to form a U-shaped sleeve 203. When in use, the U-shaped sleeve 203 is clamped to the outer side wall of the opening end 61 of the sealing component 6, so that the pressure-applying device 2 is fixed to the outer side wall of the opening end 61 of the sealing component 6. The assembly process is simple and the connection is convenient and quick.

[0059] like Figure 11As shown, optionally, the outer side wall of the opening end 61 of the sealing component 6 extends outward to form two symmetrical slide grooves 64, and the two sides of the connecting portion 20 of the pressure-applying device 2 extend outward to form two symmetrical slide rails 204. When in use, the two slide rails 204 are slidably engaged in the two slide grooves 64 to fix the pressure-applying device 2 to the outer side wall of the opening end 61 of the sealing component 6. The assembly process is simple and the connection is convenient and quick.

[0060] like Figure 13 and Figure 14 As shown, the pressure-applying device 2 is a split-molded elastic clip comprising two symmetrical clamping components 23, each comprising a clamping portion 231 at one end and a gripping portion 232 at the other end. The two clamping components 23 are elastically hinged, specifically, a second connecting component 24 is connected between the two clamping components 23. The second connecting component 24 comprises a second pin 241 and a second torsion spring 242. The inner sidewalls of the two clamping components 23 extend outward to form a pin support 233. The second pin 241 is hinged to the pin support 233. The second torsion spring 242 is hinged to the second pin 241. The second torsion spring 242 is compressed between the two clamping components 23, causing one end of the clamping component 231 to be elastically closed. In this specific embodiment, because the second torsion spring 242 is hinged to the second pin 241, an elastic hinge is formed between the two clamping components 23. When in use, the gripping portion 232 is pressed inward by the hand, so that the clamping portion 231 is elastically opened and clamped to the liquid inlet 31, which is firmly clamped, has good sealing performance, and is easy to operate. Figure 13 Preferably, elastic components 9 are embedded in the outer walls of the two clamping portions 231. The elastic components 9 increase the friction between the clamping portions 231 and the liquid inlet 31, not only preventing the pressure device 2 from falling off, but also making the pressure device 2 more firmly clamped. Optionally, the clamping portions 231 can also be clamped to the outer wall of the liquid storage container 1, so that the inner wall of the liquid storage container 1 fits together to close the injection port 10, making clamping more convenient and less labor-intensive.

[0061] like Figure 15 As shown, the pressure-applying device 2 is an integrally formed elastic clip, which includes two symmetrical clamping parts 23. The two clamping parts 23 have a clamping portion 231 at one end and an elastic bending portion 234 at the other end. The clamping portion 231 is clamped on the outer wall of the liquid storage container 1, so that the inner walls of the liquid storage container 1 fit together to close the injection port 10. It has a simple structure, a simple assembly process, and a low production cost.

[0062] refer to Figure 16 As shown, the second embodiment of the prefilled catheter flusher provided by the present invention has substantially the same structure as the first embodiment, and the difference between the two is that:

[0063] like Figure 16 As shown, optionally, the liquid storage container 1 is made of medical PE material, and the pressure-applying device 2 acts on the liquid inlet 31 by magnetic attraction to close the injection port 10. Specifically, the pressure-applying device 2 includes two magnetic components, which are magnets or electromagnets. The two magnetic components are configured so that one acts on the liquid inlet 31 and the other acts on the opposite side of the liquid inlet 31. The structure is simple and easy to implement.

[0064] refer to Figure 17 and Figure 18 As shown, the third embodiment of the prefilled catheter flusher provided by the present invention has substantially the same structure as the first embodiment, with the difference between the two being:

[0065] like Figure 17 As shown, the pressure device 2 is a rubber band or elastic lace, and the pressure device 2 is tightened on the outer wall of the liquid storage container 1 by elastic force, so that the inner wall of the liquid storage container 1 fits together to close the injection port 10. It has a simple structure, low manufacturing cost and simple assembly process. Figure 18 As shown, the pressure applying device 2 can also be tightened to the liquid inlet 31 by elastic force to close the injection port 10, making the seal more secure.

[0066] refer to Figure 19 As shown, the fourth embodiment of the prefilled catheter flusher provided by the present invention has substantially the same structure as the first embodiment, with the difference between the two being:

[0067] like Figure 19As shown, the liquid inlet 31 and the liquid outlet 32 are respectively provided at both ends of the connecting joint 3. A pressure port 35 is provided on the side wall of the connecting joint 3. The pressure port 35, the liquid inlet 31 and the liquid outlet 32 are interconnected. The inner side wall of the pressure portion 21 of the pressure device 2 extends outward to form a hemispherical protrusion 211. The hemispherical protrusion 211 has an interference fit with the pressure port 35. After passing through the pressure port 35, the hemispherical protrusion 211 is pressed against the inner wall of the connecting joint 3, thereby blocking the communication between the liquid inlet 31 and the liquid outlet 32 and sealing the injection port 10. The container wall 12 of the liquid storage container 1 covering the pressure port 35 is integrally recessed inward to form a hemispherical recess 121. The hemispherical recess 121 conforms to the hemispherical protrusion 211, ensuring the sealing between the hemispherical protrusion 211 and the inner wall of the connecting joint 3. In order to facilitate processing and product molding, a sealing film is optionally provided at the pressure port 35. The sealing film is independently provided with the liquid storage container 1. The sealing film is recessed inward to form a hemispherical recess 121. The hemispherical protrusion 211 passes through the pressure port 35 and is pressed against the inner cavity wall of the connecting joint 3, so that the communication between the liquid inlet 31 and the liquid outlet 32 is blocked and the injection port 10 is closed.

[0068] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A prefilled catheter flusher comprising: A liquid storage container (1) is at least partially deformable, the liquid storage container (1) being provided with an injection port (10), characterized in that a pressure-applying device (2) capable of closing the injection port (10) from the outside of the liquid storage container (1) is provided at one end of the injection port (10) of the liquid storage container (1), the pressure-applying device (2) acting on the outer wall of the liquid storage container (1), the pressure-applying device (2) not contacting the flushing liquid, and when the pressure of the flushing liquid reaches or exceeds a predetermined value due to deformation of the liquid storage container (1), the flushing liquid overcomes the resistance applied to the injection port (10) by the pressure-applying device (2) to open the injection port (10) to achieve flushing, and the predetermined value is greater than the venous pressure of the human body.

2. The prefilled catheter flusher according to claim 1, characterized in that The injection port (10) is sealed and fixed with a connecting joint (3), and the connecting joint (3) is used to connect to the connecting joint of the flushing pipeline. One end of the connecting joint (3) is provided with a liquid inlet (31), and the other end is provided with a liquid outlet (32). The side wall of the connecting joint (3) is provided with a pressure port (35), and the pressure port (35), the liquid inlet (31) and the liquid outlet (32) are connected to each other. The pressure device (2) acts on the inner cavity wall of the connecting joint (3) through the pressure port (35), so that the communication between the liquid inlet (31) and the liquid outlet (32) is blocked, thereby closing the injection port (10).

3. The prefilled catheter flusher according to claim 2, characterized in that The container wall (12) of the liquid storage container (1) covering the pressure port (35) is recessed inwardly to form a hemispherical recess (121), or the pressure port (35) is provided with a sealing membrane recessed inwardly to form a hemispherical recess (121); the outer wall of the pressure device (2) extends outwardly to form a hemispherical protrusion (211); the hemispherical recess (121) is conformed to the hemispherical protrusion (211); and the hemispherical protrusion (211) passes through the pressure port (35) and is pressed against the inner cavity wall of the connecting joint (3) through the hemispherical recess (121).

4. The prefilled catheter flusher according to claim 1, wherein The injection port (10) is sealed and fixed with a connecting joint (3), and the connecting joint (3) is used to connect to the connecting joint of the flushing pipeline. The pressure-applying device (2) acts on the outer wall of the liquid storage container (1), so that the inner walls of the liquid storage container (1) fit together to close the injection port (10).

5. The prefilled catheter flusher according to claim 4, characterized in that The pressure-applying device (2) includes two pressure-applying components (25), one end of which is fixed to the connecting joint (3), and the other end of which acts on opposite sides of the outer wall of the liquid storage container (1), so that the inner walls of the liquid storage container (1) fit together and close the injection port (10).

6. The prefilled catheter flusher according to claim 4, characterized in that The invention also includes a sealing component (6), wherein the sealing component (6) seals the injection port (10), and the sealing component (6) is a cover-like structure with one end closed and the other end open. The open end (61) of the sealing component (6) is sleeved on the outer wall of the connecting joint (3), and the closed end (62) of the sealing component (6) is provided with an easily foldable portion (63). The pressure-applying device (2) includes two pressure-applying components (25), one end of the two pressure-applying components (25) is formed or fixed on the outer wall of the open end (61) of the sealing component (6), and the other end acts on the opposite sides of the outer wall of the liquid storage container (1), so that the inner walls of the liquid storage container (1) fit together to close the injection port (10).

7. The prefilled catheter flusher according to claim 4, characterized in that The pressure-applying device (2) is an elastic clip, and the clamping portion (231) of the elastic clip is clamped on the outer wall of the liquid storage container (1), so that the inner walls of the liquid storage container (1) fit together to close the injection port (10).

8. The prefilled catheter flusher according to claim 1, wherein: The injection port (10) is sealed and fixed with a connecting joint (3), which is used to connect to a connecting joint of a flushed pipeline. The connecting joint (3) is provided with a liquid outlet (32) and a liquid inlet (31) that are interconnected. The liquid inlet (31) is provided on a side wall of the connecting joint (3). The liquid outlet (32) is connected to the connecting joint of the flushed pipeline, and the liquid inlet (31) is connected to the liquid storage container (1). The pressure device (2) acts on the liquid inlet (31) to close the injection port (10).

9. The prefilled catheter flusher according to claim 8, characterized in that The pressure-applying device (2) acts on the liquid inlet (31) by means of magnetic attraction to close the injection port (10); or, the pressure-applying device (2) acts on the liquid inlet (31) by means of a mechanical structure to close the injection port (10); or, the pressure-applying device (2) acts on the liquid inlet (31) by means of elastic tension to close the injection port (10).

10. The prefilled catheter flusher according to claim 9, characterized in that The pressure-applying device (2) is in the form of a pressure rod structure, one end of the pressure-applying device (2) is fixed to the connecting joint (3), and the other end is pressed against the liquid inlet (31).

11. The prefilled catheter flusher according to claim 8, wherein It also includes a sealing component (6), and the sealing component (6) is sealed at the injection port (10).

12. The prefilled catheter flusher according to claim 11, wherein The sealing component (6) is a cover-like structure with one end closed and the other end open. The open end (61) of the sealing component (6) is sleeved on the outer wall of the connecting joint (3), and the closed end (62) of the sealing component (6) is provided with an easily foldable portion (63).

13. The prefilled catheter flusher according to claim 12, wherein: The pressure-applying device (2) is a pressure rod structure, one end of the pressure-applying device (2) is formed on or fixed to the outer wall of the opening end (61) of the sealing component (6), and the other end is pressed against the liquid inlet (31).

14. The prefilled catheter flusher according to claim 10 or 13, characterized in that: The sealing method between the pressure-applying device (2) and the outer periphery of the liquid inlet (31) is surface-to-surface compression sealing; or, the sealing method between the pressure-applying device (2) and the outer periphery of the liquid inlet (31) is an annular protrusion (7) and surface compression sealing; or, the pressure-applying device (2) and the outer periphery of the liquid inlet (31) are sealed by a sealing component (8).

15. The prefilled catheter flusher according to claim 10 or 13, characterized in that: The pressure-applying device (2) is provided with a bending section (201) and a hook (4) / slot (5), the wall thickness of the bending section (201) is smaller than the wall thickness of the pressure-applying device (2) excluding the bending section (201), and the connecting joint (3) is provided with a slot (5) / hook (4) that engages with the hook (4) / slot (5); or, the pressure-applying device (2) is hingedly connected to the connecting joint (3), the pressure-applying device (2) is provided with a slot (5) / hook (4), and the connecting joint (3) is provided with a hook (4) / slot (5) that engages with the slot (5) / hook (4); or, the pressure-applying device (2) is elastically hinged to the connecting joint (3).

16. The prefilled catheter flusher according to claim 8 or 9, characterized in that: The pressure-applying device (2) is an elastic clip, and the clamping portion (231) of the elastic clip clamps the liquid inlet (31) to close the injection port (10).

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