A substitution fluid connector for hemodiafiltration

Abstract

The utility model discloses a kind of replacement fluid connectors for hemodialysis filtration, including connector assembly and cap assembly being all installed on base, the quantity of connector assembly is multiple groups, connector assembly includes hollow connecting body and the liquid outlet pipe and connecting pipe being arranged at both ends of connecting body, and one-way valve being arranged in connecting body interior, the outside of liquid outlet pipe is equipped with connecting barrel;The cap assembly includes rotating block, cap body being installed on rotating block, rotating shaft, guide column and lock catch mechanism, when guide column rotates to with the positioning slot being set on rotating block corresponding, it can press rotating block to accurately, sealingly buckle and press in the end of connecting barrel with the cap body, to seal its port and open the above-mentioned one-way valve by top core, so that the main flow passage in connecting body is opened, when lock catch mechanism locks the rotating block;The connector of the utility model does not leak in the process of replacing pipeline, cap is accurate and firm, convenient to operate.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, specifically to a replacement fluid connector for hemodialysis filtration. Background Technology

[0002] Currently, hemodialysis is a blood purification technology that involves drawing blood from the patient and passing it through a dialyzer composed of numerous hollow fiber membranes. The blood and dialysate exchange substances inside and outside the hollow fibers through diffusion, ultrafiltration, adsorption, and convection to remove metabolic waste and maintain electrolyte and acid-base balance, while also removing excess water. The purified blood is then returned to the patient. Hemofiltration, on the other hand, does not use dialysate. Instead, a certain amount of replacement fluid is continuously supplied to the vascular access. This replacement fluid mixes thoroughly with the blood, and then the blood is ultrafiltered at the same rate to remove excess water and toxins. Compared to hemodialysis, hemofiltration has advantages such as less impact on hemodynamics and a higher clearance rate of medium-molecular-weight substances.

[0003] The replacement fluid connector is the part of the tubing that draws replacement fluid from the hemofiltration machine. It connects the replacement fluid tubing to the hemofiltration machine. Because this connector is frequently connected and disconnected, the connection process must be simple and convenient, preventing any leakage of replacement fluid. It also needs to be easy to clean after use. However, existing technologies typically use multiple, independent connectors, leading to incomplete cleaning and potential blind spots. Furthermore, the connector seals rely primarily on the elasticity of the spring elements for sealing, which cannot guarantee complete locking, resulting in compromised strength and stability. Additionally, the seals cannot be precisely fastened onto the connector in one go, requiring multiple attempts, which is inefficient and inefficient. Moreover, the seals lack a proper positioning detection mechanism, making it impossible to determine if they are properly secured, posing a risk of incomplete sealing. In summary, existing replacement fluid connectors suffer from various problems, necessitating necessary improvements and innovations to meet user requirements. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a replacement fluid connector for hemodialysis filtration, which enables interconnection between connector components, avoids leaving blind spots during cleaning, is more comprehensive and cleaner, and allows for quick and leak-free tubing replacement.

[0005] The specific details are as follows: A replacement fluid connector for hemodialysis filtration, comprising components all mounted on a base: The connector assembly comprises at least two sets, each including a connector body and a one-way valve. The connector body is mounted on the base, and the interior of the connector body has a through main channel. The one-way valve is located inside the main channel and is used to control the opening or closing of the main channel. One end of the connector body has a liquid outlet pipe communicating with the main channel. A connecting cylinder coaxial with the liquid outlet pipe is installed on the outside of the liquid outlet pipe. A confluence space is provided between the connecting cylinder and the liquid outlet pipe. The confluence spaces between the connector assemblies are sequentially connected to form a sealed liquid passage. The cap assembly includes a rotating block, a cap body mounted on the rotating block, a rotating shaft, and a locking mechanism mounted on the rotating block. The cap body has a core for opening the one-way valve. The rotating shaft is slidably inserted into the base. The rotating block can rotate around the rotating shaft and move axially along the shaft. A guide post parallel to the rotating shaft is also mounted on the rotating block. One end of the guide post extends into a guide groove provided on the base. One end of the guide groove has a positioning groove communicating with it. When the guide post rotates to correspond with the positioning groove, the rotating block can be pressed to accurately and sealingly fasten the cap body to the end of the connecting cylinder, sealing the open port of the manifold space and opening the one-way valve through the core, allowing the main flow channel within the connecting body to communicate with the manifold space. At this time, the locking mechanism locks the rotating block.

[0006] Preferably, the connector is a hollow rotating structure, and a connecting pipe connected to its main channel is installed at one end of the connector. The connecting pipe and the liquid outlet pipe are located at opposite ends of the connector.

[0007] Preferably, the number of connector assemblies is two sets arranged in parallel, and the outside of the connecting cylinder is provided with a transfer pipe communicating with the internal confluence space, and the transfer pipes between the connector assemblies are sealed and connected by a hose.

[0008] Preferably, the one-way valve includes a valve core, a sealing spring, and a push rod. The two ends of the valve core are respectively connected to the sealing spring and the push rod. The other end of the sealing spring is supported on the positioning step surface provided in the main channel. The sealing spring seals and presses the valve core against the sealing step surface provided in the main channel to disconnect the main channel. The other end of the push rod extends into the liquid outlet pipe, and there is a gap between the valve core and the push rod and the inner wall of the main channel for liquid to flow.

[0009] Preferably, both the connecting cylinder and the cap are cylindrical, and a sealing ring is installed on the outside of the cap. After the cap is inserted into the connecting cylinder, the sealing ring is sealed and pressed between the cap and the connecting cylinder.

[0010] Preferably, the locking mechanism includes a swing member and a torsion spring. The swing member is rotatably mounted on the side of the rotating block via a mounting shaft. The two ends of the swing member are respectively provided with a pressing part and a locking part. The locking part is used in conjunction with the support platform provided on the side of the base. The torsion spring is fitted on the mounting shaft, and the two elastic support parts of the torsion spring are respectively supported on the swing member and the rotating block.

[0011] Preferably, a compression spring is also fitted on the rotating shaft. One end of the compression spring is supported on the base, and the other end of the compression spring is supported in a guide sleeve connected to the rotating shaft. The compression spring and the rotating block are located on two different sides of the base.

[0012] As a further preferred embodiment, the base is also equipped with microswitches for detecting the position of the rotating shafts. The number of microswitches corresponds one-to-one with the number of rotating shafts. The microswitches are all mounted on a vertical plate fixed to the base, and the external sensing element of the microswitch corresponds to the end of the corresponding rotating shaft.

[0013] Preferably, the guide groove is arc-shaped, and the center of the arc-shaped guide groove is located on the axis of the corresponding rotation shaft. One end of the guide groove is also provided with a limiting groove communicating with it. The limiting groove and the positioning groove are respectively located at the two ends of the guide groove.

[0014] Preferably, the rotating block has symmetrical and outwardly protruding handholds on both sides.

[0015] The beneficial effects of this utility model are: First, the connector body of this utility model is equipped with a one-way valve. When switching pipelines, the one-way valve will automatically seal and isolate the main flow channel in the connector body, thereby ensuring that the connector will not leak replacement fluid during pipeline switching.

[0016] Secondly, after the cap of this utility model is sealed on the corresponding connecting cylinder, the connecting cylinders between the connecting components are interconnected, thereby forming a complete loop inside the entire connector. This results in fewer dead corners in the disinfection water path during the disinfection and cleaning process, and more comprehensive cleaning.

[0017] Furthermore, during the process of fastening the cap, the rotating block can only swing in the direction set by the guide groove. Therefore, during operation, you only need to swing the cap towards the connecting cylinder. When it can no longer swing and you sense that the guide post and the positioning groove are aligned, the cap and the connecting cylinder are also aligned. You only need to press the rotating block to complete the cap fastening process. There is no need to deliberately find the right position, making the operation convenient and quick.

[0018] Finally, during the cap-clamping process, when the rotating shaft contacts the sensing element of the micro switch, the micro switch will send a signal indicating that the cap has been clamped in place. During this process, the clamping part of the locking mechanism will automatically position itself on the support platform of the base, thereby locking the rotating block relative to the base, ensuring that the cap will not fall off during use, making it safer and more reliable. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the replacement fluid connector in an embodiment of this utility model; Figure 2 for Figure 1 A three-dimensional structural diagram of one of the buckle components after it is opened; Figure 3 for Figure 1 The front view; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 4 Cross-sectional view along the BB direction; Figure 6 for Figure 1 A three-dimensional structural diagram of the central base; Figure 7 for Figure 1 A three-dimensional structural diagram of the buckle cap assembly; Figure 8 for Figure 1 A three-dimensional structural diagram of the intermediate connector assembly; Figure 9 for Figure 1 A three-dimensional structural diagram of a check valve; Explanation of the labels in the diagram: 10. Base; 101. Guide groove; 102. Positioning groove; 103. Limiting groove; 104. Support platform; 20. Connector assembly; 21. Connector body; 211. Main channel; 212. Outlet pipe; 22. Connecting pipe; 231. Valve core; 2311. Sealing gasket; 232. Sealing spring; 233. Push rod; 24. Connecting cylinder; 25. Manifold space; 26. Adapter pipe; 27. Hose; 28. 29. Screw; 30. Pressure plate; 31. Cap assembly; 32. Rotating block; 33. Handheld part; 34. Cap body; 35. Top core; 36. Sealing ring; 37. Rotating shaft; 38. Compression spring; 39. Guide sleeve; 30. Guide post; 31. Swinging part; 392. Pressing part; 393. Buckling part; 394. Mounting shaft; 395. Torsion spring; 40. Vertical plate; 41. Micro switch; 42. Sensing element. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0021] Example, refer to Figures 1 to 9 As shown in the figure, a replacement fluid connector for hemodialysis filtration includes a connector assembly 20 and a cap assembly 30, both mounted on a base 10.

[0022] The number of connector assemblies 20 is at least two sets. In this embodiment, the number of connector assemblies 20 is two sets arranged in parallel. Each connector assembly 20 includes a connector body 21 and a one-way valve. The connector body 21 is a hollow rotating structure. The interior of the connector body 21 is hollow and has a through main channel 211. Both ends of the connector body 21 are respectively connected to an outlet pipe 212 and a connecting pipe 22 that communicate with the main channel 211. The outlet pipe 212 and the connector body 21 are integrally formed, and the free end of the outlet pipe 212 has an external thread for easy connection to an external replacement fluid pipeline. The other end of the connector body 21 is connected to the connecting pipe 22 by a sleeve, and the connecting pipe 22 is connected to the connector body 212. A rubber ring for sealing is provided between the connecting pipe 21 and the connecting body 21. The connecting pipe 22 is used to connect to the pipeline on the hemodialysis machine. The external part of the outlet pipe 212 is coaxially fitted with a connecting cylinder 24 that is coaxial with it. A rubber ring for sealing is also provided between the connecting cylinder 24 and the connecting body 21. The connecting cylinder 24 is nested on the base 10, and the open end of the connecting cylinder 24 passes through the base 10. A pressure plate 29 is also fitted on the outer end of the connecting pipe 22. Multiple screws 28 connected to the base 10 are installed on the pressure plate 29. The pressure plate 29 is locked by the screws 28 with nuts, and then the connecting pipe 22, the connecting body 21 and the connecting cylinder 24 are clamped and installed on the base 10 by the pressure plate 29.

[0023] In one specific embodiment, a manifold space 25 is provided between the connecting cylinder 24 and the outlet pipe 212. The outside of the connecting cylinder 24 is provided with a transfer pipe 26 that communicates with the manifold space 25 inside. The transfer pipes 26 between the connector assemblies 20 are sealed and connected by a hose 27, so that the manifold space 25 between the connecting assemblies is connected to form a sealed liquid passage. When the cap 32 is sealed and fastened on the corresponding connecting cylinder 24, the connecting cylinders 24 between the connecting assemblies are interconnected, so that the entire inside of the connector can form a complete loop. In this way, there are fewer dead corners in the disinfection water path during the disinfection and cleaning process, and the cleaning is more comprehensive.

[0024] In one specific embodiment, the one-way valve is disposed inside the main flow channel 211 and is used to control the opening or closing of the main flow channel 211. The one-way valve includes a valve core 231, a sealing spring 232, and a push rod 233. The two ends of the valve core 231 are respectively connected to the sealing spring 232 and the push rod 233. The other end of the sealing spring 232 is supported on a positioning step surface provided inside the main flow channel 211. In this embodiment, the end of the sealing spring 232 is supported on the step surface provided inside the connecting pipe 22. The sealing spring 232 uses its elastic force to keep the valve... The valve core 231 is pressed tightly against the sealing step surface provided in the main channel 211 to disconnect the main channel 211. The other end of the push rod 233 extends into the liquid outlet pipe 212. The valve core 231 and the push rod 233 are both provided with gaps for liquid flow between themselves and the inner wall of the main channel 211. The sealing end of the valve core 231 is wrapped with a sealing gasket 2311. The valve core 231 is pressed tightly against the sealing step surface provided in the main channel 211 through the sealing gasket 2311, thereby achieving a sealed isolation of the main channel 211 and a better sealing effect.

[0025] When it is necessary to extract the replacement fluid, the connector of the replacement fluid pipeline is threaded onto the outlet pipe 212. At the same time, the pressure member installed inside the connector of the replacement fluid pipeline will push the push rod 233, thereby opening the valve core 231, so that the replacement fluid can flow out from the main channel 211 of the connector 21. After the replacement fluid extraction is completed, the connector of the replacement fluid pipeline is removed from the outlet pipe 212. The valve core 231 will automatically seal the main channel 211 of the connector 21 under the action of the sealing spring 232, thereby ensuring that no replacement fluid leakage occurs during the transfer of the pipeline 26.

[0026] In one specific embodiment, the cap assembly 30 includes a rotating block 31, a cap body 32 mounted on the rotating block 31, a rotating shaft 35, and a locking mechanism mounted on the rotating block 31. The cap body 32 contains a core 33 for opening the one-way valve. The rotating shaft 35 is slidably inserted into the base 10, i.e., the rotating shaft 35 is fitted into a circular hole provided on the base 10. The rotating block 31 can rotate around the rotating shaft 35 and move axially along the rotating shaft 35. A guide post 38 parallel to the rotating shaft 35 is also mounted on the rotating block 31. One end of the guide post 38 extends into the guide groove 101 provided on the base 10. The guide groove 101 is arc-shaped, and the center of the arc-shaped guide groove 101 is located on the axis of the corresponding rotation shaft 35. The two ends of the guide groove 101 are respectively provided with a positioning groove 102 and a limiting groove 103 communicating with it. The depth of the positioning groove 102 is greater than the depth of the limiting groove 103. Both the positioning groove 102 and the limiting groove 103 are circular grooves of the same diameter that match the guide post 38. The diameters of the positioning groove 102 and the limiting groove 103 are the same as the width of the guide groove 101, and both are smoothly connected to it. Figure 6 As shown; the rotating block 31 has symmetrical and outwardly protruding hand grips 311 on both sides, which can better control the movement of the rotating block 31 by holding the hand grips 311.

[0027] During the process of fastening the cap 32, the rotating block 31 can only swing in the direction set by the guide groove 101. Therefore, during operation, you only need to swing the cap 32 towards the connecting cylinder 24. When it can no longer swing and you sense that the guide post 38 corresponds to the positioning groove 102, the cap 32 and the connecting cylinder 24 also correspond perfectly. You only need to press the rotating block 31 to complete the cap fastening process. There is no need to deliberately find the right position. The operation is convenient and quick.

[0028] In one specific embodiment, both the connecting cylinder 24 and the cap 32 are cylindrical. A sealing ring 34 is installed on the outside of the cap 32. After the cap 32 is inserted into the connecting cylinder 24, the sealing ring 34 is sealed and pressed between the cap 32 and the connecting cylinder 24, thereby achieving a seal between the cap 32 and the connecting cylinder 24. Figure 4 As shown.

[0029] In one specific embodiment, the locking mechanism includes a swing member 391 and a torsion spring 395. The swing member 391 is rotatably mounted on the side of the rotating block 31 via a mounting shaft 394 located in its middle. The swing member 391 has a pressing part 392 and a locking part 393 at its two ends, respectively. The locking part 393 is an inwardly L-shaped part with a beveled end face. The locking part 393 cooperates with a support platform 104 located on the side of the base 10. The side of the support platform 104 also... The device has an inverted slope to facilitate the sliding of the clamping part 393. The torsion spring 395 is fitted on the mounting shaft 394, and the two elastic support parts of the torsion spring 395 are respectively supported on the swing member 391 and the rotating block 31. The elastic force of the torsion spring 395 ensures that the clamping part 393 on the swing member 391 always maintains an inward clamping tendency, ensuring the stability of the clamping part 393 when it is clamped on the support platform 104, and ensuring that the clamping part 393 will not fall off the support platform 104 due to its own weight or vibration.

[0030] In one specific embodiment, a compression spring 36 is also fitted onto the rotating shaft 35. One end of the compression spring 36 is supported on the base 10, and the other end is supported in the guide sleeve 37 connected to the rotating shaft 35. The length of the guide sleeve 37 is set to limit the distance that the rotating block 31 can move outward along the axial direction of the rotating shaft 35, preventing the guide post 38 from disengaging from the guide groove 101. That is, before the guide post 38 is about to disengage from the guide groove 101, the guide sleeve 37 has already pressed against the base 10, and the rotating block 31 cannot continue to move further outward along the axial direction of the rotating shaft 35, thereby preventing the guide post 38 from disengaging from the guide groove 101. The compression spring 36 and the rotating block 31 are respectively located on two different sides of the base 10. The base 10 is also equipped with microswitches 41 for detecting the position of the rotating shaft 35. The number of microswitches 41 corresponds one-to-one with the number of rotating shafts 35. The microswitches 41 are all installed on the upright plate 40 fixed to the base 10. The external sensor 42 of the microswitch 41 corresponds to the end of the corresponding rotating shaft 35. During the process of pressing the cap 32, when the rotating shaft 35 contacts the sensor 42 of the microswitch 41, the microswitch 41 will send a signal indicating that the cap 32 has been pressed into place. During this process, the pressing part 393 of the locking mechanism will automatically be positioned on the support platform 104 of the base 10, thereby locking the rotating block 31 relative to the base 10, ensuring that the cap 32 will not fall off during use, making it safer and more reliable.

[0031] When cleaning the pipeline is required (at this time, the guide shaft is located in the limiting groove 103), hold the rotating block 31 and pull it outward along the axial direction of the rotating shaft 35, so that the guide post 38 disengages from the limiting groove 103. Then rotate the rotating block 31 towards the connecting cylinder 24 (because of the existence of the guide groove 101, it can only rotate in this direction at this time). When it can no longer be rotated, it indicates that the guide post 38 has corresponded with the positioning groove 102. Since the guide post 38 has lost the support of the guide groove 101 at this time, coupled with the elastic force of the compression spring 36, when holding the rotating block 31, you can clearly feel that the guide shaft has a tendency to insert into the positioning groove 102. At this time, the cap 32 corresponds exactly with the connecting cylinder 24. You can then press the rotating block 31 to move the cap 32. 2. The end of the connecting cylinder 24 is accurately and sealed. During this process, the clamping part 393 of the swinging member 391 slides into the inclined plane under the action of external force and clamps onto the support platform 104, limiting the rotating block 31 and preventing the cap 32 from slipping off the connecting cylinder 24 during use. After the cap 32 is clamped, the top core 33 inside the cap 32 will push the top rod 233 to open the one-way valve, so that the main channel 211 inside the connecting body 21 is connected to the confluence space 25. At this time, the liquid channels between multiple connector assemblies 20 are interconnected, so that a complete loop can be formed inside the entire connector. In this way, there are fewer dead corners in the disinfection water path during the disinfection and cleaning process, and the cleaning is more comprehensive.

[0032] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A connector for replacement fluid in hemodialysis filtration, characterized in that, Including those all mounted on the base: The connector assembly comprises at least two sets, each including a connector body and a one-way valve. The connector body is mounted on the base, and the interior of the connector body has a through main channel. The one-way valve is located inside the main channel and is used to control the opening or closing of the main channel. One end of the connector body has a liquid outlet pipe communicating with the main channel. A connecting cylinder coaxial with the liquid outlet pipe is installed on the outside of the liquid outlet pipe. A confluence space is provided between the connecting cylinder and the liquid outlet pipe. The confluence spaces between the connector assemblies are sequentially connected to form a sealed liquid passage. The cap assembly includes a rotating block, a cap body mounted on the rotating block, a rotating shaft, and a locking mechanism mounted on the rotating block. The cap body has a core for opening the one-way valve. The rotating shaft is slidably inserted into the base. The rotating block can rotate around the rotating shaft and move axially along the shaft. A guide post parallel to the rotating shaft is also mounted on the rotating block. One end of the guide post extends into a guide groove provided on the base. One end of the guide groove has a positioning groove communicating with it. When the guide post rotates to correspond with the positioning groove, the rotating block can be pressed to accurately and sealingly fasten the cap body to the end of the connecting cylinder, sealing the open port of the manifold space and opening the one-way valve through the core, allowing the main flow channel within the connecting body to communicate with the manifold space. At this time, the locking mechanism locks the rotating block.

2. The replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The connector is a hollow rotating structure, and a connecting pipe connected to its main channel is installed at one end of the connector. The connecting pipe and the liquid outlet pipe are located at opposite ends of the connector.

3. The replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The number of connector assemblies is two sets arranged in parallel, and the outside of the connecting cylinder is provided with a transfer pipe that communicates with the internal manifold space. The transfer pipes between the connector assemblies are sealed and connected by a hose.

4. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The one-way valve includes a valve core, a sealing spring, and a push rod. The two ends of the valve core are connected to the sealing spring and the push rod, respectively. The other end of the sealing spring is supported on the positioning step surface provided in the main channel. The sealing spring seals and presses the valve core against the sealing step surface provided in the main channel to disconnect the main channel. The other end of the push rod extends into the liquid outlet pipe, and there is a gap between the valve core and the push rod and the inner wall of the main channel for liquid to flow.

5. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, Both the connecting cylinder and the cap are cylindrical. A sealing ring is installed on the outside of the cap. After the cap is inserted into the connecting cylinder, the sealing ring is sealed and pressed between the cap and the connecting cylinder.

6. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The locking mechanism includes a swing member and a torsion spring. The swing member is rotatably mounted on the side of the rotating block via a mounting shaft. The two ends of the swing member are respectively provided with a pressing part and a locking part. The locking part is used in conjunction with the support platform provided on the side of the base. The torsion spring is fitted on the mounting shaft, and the two elastic support parts of the torsion spring are respectively supported on the swing member and the rotating block.

7. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, A compression spring is also fitted on the rotating shaft. One end of the compression spring is supported on the base, and the other end of the compression spring is supported in the guide sleeve connected to the rotating shaft. The compression spring and the rotating block are located on two different sides of the base.

8. A replacement fluid connector for hemodialysis filtration as described in claim 7, characterized in that, The base is also equipped with microswitches for detecting the position of the rotating shafts. The number of microswitches corresponds one-to-one with the number of rotating shafts. The microswitches are all mounted on a vertical plate fixed to the base, and the external sensing element of the microswitch corresponds to the end of the corresponding rotating shaft.

9. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The guide groove is arc-shaped, and the center of the arc-shaped guide groove is located on the axis of the corresponding rotation shaft. One end of the guide groove is also provided with a limiting groove that communicates with it. The limiting groove and the positioning groove are respectively located at the two ends of the guide groove.

10. A replacement fluid connector for hemodialysis filtration as described in claim 1, characterized in that, The rotating block has symmetrical, outwardly protruding handholds on both sides.

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