A needle-free urinary catheterization device

Abstract

The present invention relates to the technical field of medical devices, and more specifically, to a needle-free urinary catheterization device. The device comprises a catheter, a metering box, and a liquid storage bag; one end of the catheter is connected to the metering box, and the metering box is connected to the liquid storage bag via a through-tube provided at the bottom, and a first vent is provided on a side wall of the metering box; an automatic drainage pipeline connected to the through-tube is provided in the metering box, and the automatic drainage pipeline utilizes the siphon principle to discharge the liquid in the metering box into the liquid storage bag through the through-tube; and the automatic drainage pipeline is located below the catheter. In the needle-free urinary catheterization device, a movable part is provided in the automatic drainage pipeline, and the force generated by the flow of liquid in the automatic drainage pipeline is utilized to drive the movable part, forcing the movable part to temporarily block the catheter, thereby reducing the liquid discharged from the patient's body into the metering box during the siphon state, and reducing the difference between the liquid amounts discharged multiple times.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a needle-free sampling urinary catheterization device. Background Art

[0002] A drainage bag generally refers to a transparent plastic bag at the end of the drainage tube that is used to collect the drained liquid after surgery, where bleeding and fluid accumulation deep inside the body or in a local area need to be drained out using a tube.

[0003] In order to achieve the metering function, current urinary catheterization drainage belts will be equipped with a metering box between the catheter and the liquid storage bag (because the liquid storage bag is usually a soft bag, inaccurate metering may occur). The metering box is made of hard transparent material, and there are scale lines on the surface of the metering box, and the scale lines can be used to know the amount of liquid. However, the capacity of the metering box is usually 500ML. When the liquid in the metering box exceeds 500ML, the excess liquid will automatically flow into the liquid storage bag through the pipeline. Therefore, when it is necessary to observe the liquid volume for a long time, it is necessary to record the liquid volume in the metering box before it reaches the rated capacity, and then pour the liquid in the metering box into the liquid storage bag, thus entering the metering stage again.

[0004] To prevent excess liquid from automatically flowing into the liquid storage bag. In related technologies, a siphon structure is set in the metering box, and the siphon structure is used to automatically and quantitatively discharge the liquid in the metering box. In this way, the nursing staff only needs to know the number of automatic quantitative discharges to calculate the amount of liquid. However, the amount of urine produced is determined by the patient's drinking situation at the time, that is, the amount of urine produced is irregular. When the liquid in the metering box is discharged through the siphon structure, if the urine in the patient's body enters the metering box at this time, this part of the urine will also be discharged directly through the siphon structure, which can easily lead to differences in the amount of liquid discharged by multiple siphons. Summary of the Invention

[0005] The object of the present invention is to provide a needle-free sampling urinary catheterization device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, a needle-free urinary catheterization device is provided, comprising a catheter, a metering box, and a liquid storage bag; one end of the catheter is connected to the metering box, and the metering box is connected to the liquid storage bag via a through-tube provided at the bottom, and a first vent is provided on a side wall of the metering box; an automatic drainage pipeline connected to the through-tube is provided in the metering box, and the automatic drainage pipeline uses the siphon principle to discharge the liquid in the metering box through the through-tube into the liquid storage bag; the automatic drainage pipeline is located below the catheter, and a movable part is provided at the top of the automatic drainage pipeline at a position corresponding to the catheter; in the siphon state, the movable part uses the force of the liquid during the siphoning process to block the catheter;

[0007] The automatic liquid discharge pipeline includes an outer tube and an inner tube, the upper and lower ends of the outer tube and the inner tube are both in a through-state, and the movable member is fixedly arranged on the top of the outer tube to seal the top of the outer tube;

[0008] The outer tube, the inner tube and the movable part together form an automatic liquid discharge pipeline, so as to utilize the siphon principle to discharge the liquid in the metering box into the liquid storage bag through the through pipe.

[0009] As a further improvement of the present technical solution, the height of the outer tube is higher than that of the inner tube, and the diameter of the inner tube is smaller than that of the outer tube, so that a flow cavity is formed between the outer ring of the inner tube and the inner ring of the outer tube;

[0010] The inner tube is communicated with the through tube, and a through opening is provided between the bottom end of the outer tube and the inner wall of the bottom of the conduit.

[0011] As a further improvement of the present technical solution, the movable member is a flexible sheet fixedly mounted on the top of the outer tube and sealing the top of the outer tube; in a normal state, the middle portion of the flexible sheet is concave downward, thereby invading the flow cavity;

[0012] The concave portion of the flexible sheet is located directly below the catheter. When the liquid in the flow cavity flows, the force generated by the liquid flow pushes the concave portion of the flexible sheet upward, so that the pushed portion of the flexible sheet blocks the bottom end of the catheter.

[0013] As a further improvement of the present technical solution, the distance between the bottom end of the conduit and the recess of the flexible sheet is smaller than the distance that the flexible sheet is pushed upward by the liquid.

[0014] As a further improvement of the present technical solution, the thickness of the flexible sheet is between 0.02 mm and 0.1 mm.

[0015] As a further improvement of the present technical solution, an upper stopper is fixedly provided at the top of the recessed part of the flexible sheet, and the outer diameter of the top of the upper stopper is consistent with the inner diameter of the catheter; when the flexible sheet is pushed upward, the flexible sheet drives the upper stopper to move upward and insert into the bottom end of the catheter to seal the bottom end of the catheter.

[0016] As a further improvement of the present technical solution, the recessed portion of the flexible sheet is used to collect the liquid discharged from the catheter, and when the flexible sheet is in a recessed state, the recessed portion of the flexible sheet fits into the top of the inner tube, so as to utilize the gravity of the liquid on the top of the flexible sheet to seal the top of the inner tube, and when the liquid level in the metering box reaches a corresponding height, the flexible sheet utilizes the buoyancy of the liquid to separate from the inner tube.

[0017] As a further improvement of the present technical solution, a lower stopper is fixedly provided at the bottom of the flexible sheet, the outer diameter of the bottom end of the lower stopper is consistent with the inner diameter of the inner tube, and the bottom end of the lower stopper is in a conical state. When the flexible sheet is in a recessed state, the lower stopper is in the inner tube; there is a support ring in the middle of the outer ring of the flexible sheet, and the support ring is a hollow structure.

[0018] As a further improvement of the present technical solution, a power-assisting rod is fixedly provided on the outer ring of the flexible sheet, and the bottom end of the power-assisting rod extends into the flow cavity, and the liquid flowing in the flow cavity provides power for the upward deformation of the flexible sheet.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In this needle-free sampling catheterization device, a movable part is provided in the automatic drainage pipeline. The force generated by the flow of liquid in the automatic drainage pipeline is used to drive the movable part, forcing the movable part to temporarily block the catheter. In this way, the liquid discharged from the patient's body into the metering box during the siphon state is reduced, and the difference between the liquid volumes discharged multiple times is reduced.

[0021] 2. In this needle-free sampling catheterization device, the flexible sheet in the concave state can use the gravity of urine to block the inner tube, thereby increasing the amount of liquid before the siphon effect occurs, avoiding partial urine discharge through the inner tube when the urine flow in the catheter is small, and reducing the error in the amount of liquid discharged multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 The structure of the automatic drainage pipeline of the present invention is shown as follows Figure 1 ;

[0024] Figure 3 The structure of the automatic drainage pipeline of the present invention is shown as follows Figure 2 ;

[0025] Figure 4 It is a schematic diagram of the state of the flexible sheet of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the upper stopper of the present invention;

[0027] Figure 6 It is a schematic diagram of the state of the upper stopper of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the lower stopper of the present invention;

[0029] Figure 8 The state diagram of the lower stopper of the present invention is shown as follows: Figure 1 ;

[0030] Figure 9 The state diagram of the lower stopper of the present invention is shown as follows: Figure 2 ;

[0031] Figure 10 It is a structural schematic diagram of the power assist rod of the present invention.

[0032] The meaning of each number in the figure is:

[0033] 100. Catheter; 101. Connector; 102. Sampling port; 103. Tube cap; 104. Tube clamp; 110. Metering box; 111. First vent hole; 112. Through pipe; 113. Connecting plate; 120. Automatic drainage pipeline; 121. Outer tube; 122. Inner tube; 123. Flow chamber; 124. Through port; 130. Flexible sheet; 131. Upper block; 132. Lower block; 133. Support ring; 134. Power assist rod; 200. Liquid storage bag; 201. Cross valve; 202. Second vent hole; 203. Check valve. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0037] In the related art, a Chinese patent with the announcement number CN104771794B discloses a disposable automatic precision metering drainage bag. This patent uses a siphon structure to automatically and quantitatively discharge the liquid in the metering box 110. The number of times the liquid is automatically discharged is then calculated based on the amount of liquid in the liquid storage bag 200, and the final urine volume is obtained by calculating the number of times and the amount discharged each time. However, this patent also has the problem mentioned above, that is, during the automatic quantitative discharge process, the catheter 100 is not blocked, which easily causes the urine just discharged from the patient's body to mix with the liquid in the siphoning process, causing the just discharged urine to be discharged under the siphoning action, resulting in the amount of liquid discharged this time being higher than the amount of liquid discharged at other times.

[0038] To this end, the present invention provides a needle-free sampling catheterization device, see Figure 1 As shown, it includes three parts: a catheter 100, a metering box 110 (made of hard transparent material) and a liquid storage bag 200. Figure 1 The direction shown in FIG is based on the direction shown in FIG. , one end of the conduit 100 is connected to the top of the metering box 110, and the metering box 110 is connected to the liquid storage bag 200 through the through pipe 112 at the bottom. At the same time, the side walls of the liquid storage bag 200 and the side walls of the metering box 110 are both provided with filters for balancing the air pressure between the inside and outside of the liquid storage bag 200 and the metering box 110. The position of the filter is as shown in FIG. Figure 1 As shown, the filter located on the side wall of the metering box 110 is the first vent 111, and the filter located on the side wall of the liquid storage bag 200 is the second vent 202. In addition, a cross valve 201 is provided at the bottom of the liquid storage bag 200 for discharging the liquid in the liquid storage bag 200, and a check valve 203 is provided inside to prevent the liquid from entering the through tube 112.

[0039] It should be understood that the structures of the cross valve 201 and the check valve 203 belong to the prior art, and the same or similar structures are generally provided in current flow diverters, so they will not be described in detail here.

[0040] In addition, the metering box 110 and the liquid storage bag 200 are fixedly connected by a connecting plate 113. The connecting plate 113 can withstand the pulling force applied by the liquid storage bag 200 to the metering box 110, and can prevent the through tube 112 from detaching from the liquid storage bag 200 when the amount of liquid in the liquid storage bag 200 is large.

[0041] During urinary catheterization, the catheter 100 is first connected to the patient's urinary catheter. Urine in the patient then flows through the urinary catheter and the catheter 100 into the metering box 110. The urine is then quantitatively discharged into the through tube 112 via the automatic drainage line 120 (described in detail below) within the catheter 100. The urine then flows through the through tube 112 into the liquid storage bag 200. To drain the urine from the liquid storage bag 200, simply open the cross valve 201.

[0042] At the same time, the side wall of the metering box 110 is provided with scale lines, and the capacity indicated by the scale lines corresponds to the capacity of the automatic discharge pipe 120. That is, the maximum capacity that can be accommodated before the siphon effect is formed is the capacity indicated by the scale lines, or the rated capacity of the metering box 110.

[0043] In addition, the side wall of the liquid storage bag 200 is also provided with scale lines. The capacity displayed by the scale lines of the liquid storage bag 200 is a multiple of the automatic discharge capacity of the metering box 110. Because it is a quantitative automatic discharge, under normal circumstances, the amount of liquid in the liquid storage bag 200 is a multiple of the quantitative automatic discharge amount of the metering box 110. The scale value of the liquid storage bag 200 corresponds to the liquid automatically discharged each time, which is convenient for observing and recording the number of automatic discharges and the total amount of liquid.

[0044] The urinary catheterization device of the present invention is also equipped with a needle-free sampling connector to enable urine sampling in a needle-free environment. Figure 1 As shown, the needleless sampling connector includes a connector 101 connected to one end of a catheter 100. A sampling port 102 is provided on the outer ring of the connector 101, and a plug is provided at the sampling port 102 to control the opening and closing of the sampling port 102. In addition, to prevent urine from flowing, a tube clamp 104 is provided on the outside of the catheter 100. Before sampling, the connector 101 is connected to the patient's urinary catheter, and the catheter 100 is clamped with the tube clamp 104 for 10 to 15 minutes or until a sufficient amount of sampled urine is visible in the sampling window. The sampling port 102 is then opened and sterilized, and a syringe is then inserted into the sampling port 102 to slowly draw a urine sample. After sampling is completed, the syringe is removed from the sampling port 102 and the tube clamp 104 is reopened.

[0045] It should be understood that a cap 103 may be further provided at the end of the connector 101. The cap 103 is sleeved on the outside of the connector 101 to seal the connector 101, thereby preventing the urinary catheterization device of the present invention from being contaminated before use.

[0046] It should be noted that the present invention does not improve the structure of the needleless sampling connector. The needleless sampling connector has been publicly disclosed and is already in practical use, so it will not be described in detail here. The specific structure can be referenced, for example, in Chinese patent publication number CN202342258U.

[0047] like Figure 2As shown, the metering box 110 is provided with an automatic drainage pipeline 120 connected to the through pipe 112. The automatic drainage pipeline 120 uses the siphon principle to discharge the liquid in the metering box 110 into the liquid storage bag 200 through the through pipe 112; and the automatic drainage pipeline 120 is located below the catheter 100, and a movable part is provided at the top of the automatic drainage pipeline 120 corresponding to the position of the catheter 100; in the siphon state, the movable part uses the force of the liquid in the siphon process to block the catheter 100.

[0048] That is to say, by setting a movable part in the automatic drainage pipeline 120, the force generated by the flow of liquid in the automatic drainage pipeline 120 is used to drive the movable part, forcing the movable part to temporarily block the catheter 100, thereby reducing the liquid discharged from the patient's body into the metering box 110 during the siphon state, and reducing the difference between the amount of liquid discharged multiple times.

[0049] like Figure 2 and Figure 3 As shown, the automatic drainage pipeline 120 includes an outer tube 121 and an inner tube 122. The upper and lower ends of the outer tube 121 and the inner tube 122 are both connected, and a movable part is fixedly arranged on the top of the outer tube 121 to seal the top of the outer tube 121. In this way, the outer tube 121, the inner tube 122 and the movable part together constitute the automatic drainage pipeline 120, which uses the siphon principle to discharge the liquid in the metering box 110 into the liquid storage bag 200 through the through tube 112. Among them, the height of the outer tube 121 is higher than the height of the inner tube 122, and the diameter of the inner tube 122 is smaller than the diameter of the outer tube 121. In this way, a flow cavity 123 is formed between the outer circle of the inner tube 122 and the inner circle of the outer tube 121. In addition, the inner tube 122 is connected to the through tube 112, and a through opening 124 is set between the bottom end of the outer tube 121 and the inner wall of the bottom of the catheter 100.

[0050] In this way, after the liquid enters the metering box 110 through the catheter 100, the liquid in the catheter 100 gradually increases during the accumulation process. When the liquid in the catheter 100 is higher than the top height of the inner tube 122, the liquid is discharged through the inner tube 122, and negative pressure is generated during the discharge process, so that the liquid in the metering box 110 is sucked into the inner tube 122 through the port 124 and the flow cavity 123, and then flows into the liquid storage bag 200 through the inner tube 122.

[0051] In some embodiments, as Figure 2 and Figure 3As shown, the movable member is a flexible sheet 130 fixedly mounted at the top of the outer tube 121 and sealing the top of the outer tube 121. Flexible sheet 130 is preferably made of waterproof plastic or rubber material, with a thickness preferably between 0.02 mm and 0.1 mm (for details, refer to the thickness of a plastic bag or balloon). Furthermore, the cross-section of flexible sheet 130 in its normal state is V-shaped, meaning that the middle portion of flexible sheet 130 is recessed downward (also referred to as a recessed state), thereby intruding into the flow chamber 123. Furthermore, the recessed portion of flexible sheet 130 is located directly below the catheter 100. When liquid flows within the flow chamber 123, the force generated by the liquid flow pushes the recessed portion of flexible sheet 130 upward, causing the pushed portion of flexible sheet 130 to block the bottom end of the catheter 100. The distance between the bottom end of the catheter 100 and the recessed portion of flexible sheet 130 is less than the distance the liquid pushes the flexible sheet 130 upward.

[0052] Combine Figure 4 Therefore, the dotted part in the figure is the state before the flexible sheet 130 is pushed. When the siphon starts, the liquid in the flow chamber 123 will flow in the direction of the arrow, and continue to flow to the top of the inner tube 122, and finally fall into the inner tube 122. In the process of the liquid flowing to the top of the inner tube 122, the thrust generated by the liquid flow will prop up the flexible sheet 130, that is, drive the concave part of the flexible sheet 130 to deform upward. In this way, the upward deformation of the concave part of the flexible sheet 130 can block the bottom of the metering box 110, so that during the siphoning process, the urine in the catheter 100 will not flow into the metering box 110. When the siphon ends, the thrust of the liquid on the flexible sheet 130 disappears, and the urine in the catheter 100 presses the flexible sheet 130 downward to reset due to its own gravity. At this time, the bottom end of the catheter 100 is opened.

[0053] Moreover, in order to improve the blocking effect on the bottom of the catheter 100. Figure 5 and Figure 6 As shown, an upper stopper 131 is fixedly mounted on the top of the recessed portion of the flexible sheet 130. The outer diameter of the top of the upper stopper 131 is consistent with the inner diameter of the catheter 100, and the top of the upper stopper 131 is tapered (to facilitate insertion of the upper stopper 131 into the catheter 100). Thus, when the flexible sheet 130 is pushed upward, it drives the upper stopper 131 upward and inserts into the bottom end of the catheter 100, thereby sealing the bottom end of the catheter 100. When the liquid stops pushing on the flexible sheet 130, the flexible sheet 130 returns to its normal position due to the weight of the upper stopper 131 or the weight of the urine in the catheter 100.

[0054] When the flow rate of urine is low, the liquid level in the metering box 110 rises slowly. As a result, when the liquid level is slightly higher than the top of the inner tube 122, the liquid will be discharged directly through the inner tube 122. Since the flow rate of urine discharged through the catheter 100 is low, the liquid cannot fill the inner tube 122, making it difficult to form a siphon effect.

[0055] In other embodiments, the recessed portion of the flexible sheet 130 is used to collect liquid discharged from the catheter 100. When the flexible sheet 130 is in the recessed state, the recessed portion of the flexible sheet 130 fits against the top of the inner tube 122, thereby utilizing the gravity of the liquid on the top of the flexible sheet 130 to block the top of the inner tube 122. When the liquid level in the metering box 110 reaches a corresponding height, the flexible sheet 130 utilizes the buoyancy of the liquid to separate from the inner tube 122. This can increase the liquid level in the metering box 110 before a siphon effect occurs.

[0056] Working principle: Before the siphon effect occurs, the flexible sheet 130 will not be pushed by the liquid. Since the flexible sheet 130 is located below the catheter 100, the urine falling through the catheter 100 will first fill the "V"-shaped flexible sheet 130, and then the excess urine will overflow into the metering box 110. In this way, due to the presence of urine, the gravity of the urine will be applied to the top of the flexible sheet 130, causing the concave part of the flexible sheet 130 to rest against the top of the inner tube 122. At this time, Figure 8 As shown, when the liquid level is slightly higher than the height of the inner tube 122, due to the small contact area of the liquid on the flexible sheet 130, the gravity of the urine on the top of the flexible sheet 130 overcomes the buoyancy of the flexible sheet 130. At this time, the flexible sheet 130 continues to block the top of the inner tube 122, and no siphon effect will occur.

[0057] When the liquid level in the metering box 110 continues to rise, Figure 9 As shown, the contact area between the liquid surface and the bottom of the flexible sheet 130 becomes larger, so the buoyancy of the flexible sheet 130 becomes larger, so that the flexible sheet 130 overcomes the weight of the urine on the top. At this time, the bottom of the flexible sheet 130 will be lifted by the liquid in the metering box 110. At this time, a gap is generated between the bottom of the flexible sheet 130 and the top of the inner tube 122, so that the liquid begins to be discharged through the inner tube 122, and then a siphon effect is generated. At the moment of discharge, the liquid pushes the flexible sheet 130 through the inclined surface at the bottom of the flexible sheet 130, causing the concave part of the flexible sheet 130 to deform upward. Then, during the siphon process, the liquid flowing in the flow cavity 123 continues to support the flexible sheet 130.

[0058] In order to improve the sealing effect on the top of the inner tube 122. Figure 7-10As shown, a lower stopper 132 is fixedly provided at the bottom of the flexible sheet 130, the outer diameter of the bottom end of the lower stopper 132 is consistent with the inner diameter of the inner tube 122, and the bottom end of the lower stopper 132 is in a conical state. When the flexible sheet 130 is in a recessed state, the lower stopper 132 is in the inner tube 122; there is a support ring 133 in the middle of the outer ring of the flexible sheet 130, and the support ring 133 is a hollow structure.

[0059] First, as Figure 8 As shown, when the liquid level does not exceed the support ring 133, the buoyancy of the flexible sheet 130 is small, and the bottom of the flexible sheet 130 does not undergo significant displacement. At this time, the lower stopper 132 remains within the inner tube 122. When the liquid level exceeds the support ring 133, since the support ring 133 is hollow, it is subject to the buoyancy of the liquid, thereby driving the flexible sheet 130 to deform upward. At the same time, combined with the buoyancy of the flexible sheet 130 itself, the lower stopper 132 moves upward and detaches from the top of the inner tube 122. At the moment the lower stopper 132 detaches from the top of the inner tube 122, the liquid in the metering box 110 pushes the lower stopper 132 upward via the inclined surface at the bottom end of the lower stopper 132. At this time, the lower stopper 132 drives the flexible sheet 130 to deform upward, causing the flexible sheet 130 to block the bottom end of the catheter 100.

[0060] It can be seen that the flexible sheet 130 in the concave state can use the gravity of urine to block the inner tube 122, thereby increasing the amount of liquid before the siphon effect occurs, avoiding the discharge of part of the urine through the inner tube 122 when the urine flow in the catheter 100 is small, and reducing the error in the amount of liquid discharged multiple times.

[0061] Furthermore, in order to increase the thrust exerted by the liquid on the flexible sheet 130 during the flow process, a booster rod 134 is fixedly provided on the outer ring of the flexible sheet 130, and the bottom end of the booster rod 134 extends into the flow chamber 123. Thus, when the liquid in the flow chamber 123 flows toward the top of the inner tube 122, the flowing liquid will impact the booster rod 134 upward, causing the booster rod 134 to drive the flexible sheet 130 to deform upward, thereby improving the efficiency and stability of the upward deformation of the concave portion of the flexible sheet 130.

[0062] Furthermore, the top end of the outer tube 121 is preferably trumpet-shaped, so that a larger area of the flexible sheet 130 can be provided, thereby collecting more urine and improving the stability of the flexible sheet 130 when the urine fluid actuates the depression.

[0063] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A needleless sampling catheterization device, comprising a catheter (100), a metering box (110), and a liquid storage bag (200); one end of the catheter (100) is connected to the metering box (110), the metering box (110) is connected to the liquid storage bag (200) via a through pipe (112) provided at the bottom, and a first vent hole (111) is provided on a side wall of the metering box (110); the device is characterized in that: The metering box (110) is provided with an automatic liquid discharge pipeline (120) connected to the through pipe (112), and the automatic liquid discharge pipeline (120) uses the siphon principle to discharge the liquid in the metering box (110) through the through pipe (112) into the liquid storage bag (200); and the automatic liquid discharge pipeline (120) is located below the catheter (100), and a movable part is provided at the top of the automatic liquid discharge pipeline (120) corresponding to the catheter (100); in the siphon state, the movable part uses the force of the liquid during the siphon process to block the catheter (100); The automatic liquid discharge pipeline (120) comprises an outer tube (121) and an inner tube (122), the upper and lower ends of the outer tube (121) and the inner tube (122) are both in a through-state, and the movable member is fixedly arranged on the top of the outer tube (121) to seal the top of the outer tube (121); The outer tube (121), the inner tube (122) and the movable part together form an automatic liquid discharge pipeline (120) for discharging the liquid in the metering box (110) into the liquid storage bag (200) through the through tube (112) using the siphon principle; The height of the outer tube (121) is higher than the height of the inner tube (122), and the diameter of the inner tube (122) is smaller than the diameter of the outer tube (121), so that a flow cavity (123) is formed between the outer ring of the inner tube (122) and the inner ring of the outer tube (121); The inner tube (122) is in communication with the through tube (112), and a through opening (124) is provided between the bottom end of the outer tube (121) and the inner wall of the bottom of the conduit (100); The movable member is a flexible sheet (130) fixedly arranged on the top end of the outer tube (121) and sealing the top end of the outer tube (121); in a normal state, the middle portion of the flexible sheet (130) is recessed downward, thereby invading the flow cavity (123); The concave portion of the flexible sheet (130) is located directly below the conduit (100), and when the liquid in the flow chamber (123) flows, the force generated by the liquid flow pushes the concave portion of the flexible sheet (130) upward, so that the pushed portion of the flexible sheet (130) blocks the bottom end of the conduit (100); The recessed portion of the flexible sheet (130) is used to collect liquid discharged from the catheter (100), and when the flexible sheet (130) is in a recessed state, the recessed portion of the flexible sheet (130) fits against the top of the inner tube (122), so as to utilize the gravity of the liquid on the top of the flexible sheet (130) to seal the top of the inner tube (122), and when the liquid level in the metering box (110) reaches a corresponding height, the flexible sheet (130) utilizes the buoyancy of the liquid to separate from the inner tube (122).

2. The needle-free urinary catheterization device according to claim 1, characterized in that: The distance between the bottom end of the conduit (100) and the depression of the flexible sheet (130) is smaller than the distance the flexible sheet (130) is pushed upward by the liquid.

3. The needle-free urinary catheterization device according to claim 1, characterized in that: The thickness of the flexible sheet (130) is between 0.02 mm and 0.1 mm.

4. The needle-free urinary catheterization device according to claim 1, characterized in that: An upper stopper (131) is fixedly provided at the top of the recessed portion of the flexible sheet (130), and the outer diameter of the top end of the upper stopper (131) is consistent with the inner diameter of the catheter (100); when the flexible sheet (130) is pushed upward, the flexible sheet (130) drives the upper stopper (131) to move upward and insert into the bottom end of the catheter (100), thereby blocking the bottom end of the catheter (100).

5. The needle-free urinary catheterization device according to claim 1, characterized in that: A lower stopper (132) is fixedly provided at the bottom of the flexible sheet (130), the outer diameter of the bottom end of the lower stopper (132) is consistent with the inner diameter of the inner tube (122), and the bottom end of the lower stopper (132) is in a conical state. When the flexible sheet (130) is in a recessed state, the lower stopper (132) is located inside the inner tube (122); a support ring (133) is provided in the middle of the outer ring of the flexible sheet (130), and the support ring (133) is a hollow structure.

6. The needle-free urinary catheterization device according to claim 1, characterized in that: The outer ring of the flexible sheet (130) is fixedly provided with a power-assisting rod (134), and the bottom end of the power-assisting rod (134) extends into the flow cavity (123), and the liquid flowing in the flow cavity (123) provides power for the upward deformation of the flexible sheet (130).

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