Automatic stop valve for preventing overflow of waste liquid and negative pressure suction thrombus removal system

Abstract

The utility model relates to an automatic stop valve capable of preventing waste liquid from overflowing and a negative pressure suction thrombus removal system. The automatic stop valve comprises a valve seat and a valve element assembly, wherein the valve seat is arranged on an exhaust outlet of a liquid collection bottle and used for conducting gas, and the valve element assembly is arranged in the valve seat and used for controlling a gas circuit of the valve seat to be connected and disconnected through axial movement in the valve seat. According to the utility model, when the liquid collecting bottle is nearly full, the stop valve can immediately and automatically cut off a gas path; and meanwhile, the vacuum pump can generate sound change due to sudden increase of the gas circuit load, high-frequency squeal is generated and serves as an early warning prompt for an operator, and therefore effective protection on gas circuit elements in the thrombus suction process is further achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, especially to an automatic stop valve preventing waste liquid overflow and a negative pressure suction and embolus removal system. BACKGROUND

[0002] Acute thromboembolic disease is a common critical condition of cardiovascular system in clinic. More and more direct suction and embolus removal through catheter is used in the treatment of such disease. The technique has the advantages of high recanalization rate, good safety, simple surgical equipment, short operation time, low treatment cost and excellent clinical application prospect. The early direct suction and embolus removal operation usually uses a large-caliber syringe directly connected to an interventional catheter, which has the disadvantages of simple tool, inconvenient operation and affected operation effect. After improvement, a negative pressure suction system capable of automatically generating and accurately controlling suction pressure is usually used in clinic at present, which is composed of a vacuum pump, a regulating valve, a filter and a liquid collecting bottle, and is used to connect a suction catheter to complete the operation of suctioning thrombus.

[0003] Figure 1 The negative pressure suction and embolus removal system in the prior art shown in the figure, the vacuum pump is the core component of the pneumatic circuit in the suction system, which is expensive and not resistant to liquid and solid pollution, so a filter and a liquid collecting bottle are needed at the distal end to intercept liquid and solid substances to prevent them from entering the vacuum pump and causing damage. In normal use, the thrombus and blood mixture sucked from the embolism site of the patient through the suction catheter flows through the liquid collecting bottle and falls into the liquid collecting bottle due to gravity and is intercepted, only air, water vapor and a small amount of blood droplets and thrombus particles can pass through the liquid collecting bottle into the upstream pneumatic pipeline. The filter can further adsorb and prevent water vapor, blood droplets and thrombus particles, ensuring that only dry air enters the vacuum pump.

[0004] The operation for treating acute thromboembolic disease usually needs to be carried out in a hurry. In the operation, in order to quickly empty the gas in the liquid collecting bottle after starting the vacuum pump, so as to quickly establish suction negative pressure in the suction catheter to implement the suction of thrombus, the liquid collecting bottle is not suitable to have a large volume. Thus, there is a risk that if the operation duration is long, the waste liquid intercepted in the liquid collecting bottle may be full while the operation is still continuing. At this time, all members of the operation team are usually focusing on the patient's condition and operation, and no one notices that the liquid collecting bottle is full, so a large amount of thrombus and blood waste liquid flows into the pneumatic circuit. Since the main function of the filter is to filter water vapor, a small amount of liquid droplets and solid particles, it cannot effectively prevent the flow of a large amount of thrombus and blood waste liquid, and the filter layer may be blocked or even damaged. Even the thrombus and blood waste liquid may further flow into the vacuum pump and damage the vacuum pump immediately. This will suddenly stop the operation and directly cause disastrous consequences.

[0005] Therefore, how to design a device capable of automatically shutting down the suction pneumatic circuit and giving a warning when the liquid collecting bottle is close to overflowing is crucial. Utility model content

[0006] In view of this, the utility model provides an automatic stop valve and negative pressure suction unplug system for preventing waste liquid overflow, aiming at solving the problems in the prior art.

[0007] Specifically, the utility model discloses an automatic stop valve for preventing waste liquid overflow: including the valve seat for conducting gas arranged on the port of the connecting gas path element of the liquid collecting bottle and the valve core assembly for controlling the on-off of the gas path of the valve seat by moving axially in the valve seat.

[0008] Among them, the valve seat includes a connector for communicating with the exhaust outlet of the liquid collecting bottle and a base arranged at the bottom of the connector for accommodating the valve core assembly to control whether to be connected with the connector by axial movement.

[0009] A plurality of vent holes are arranged circumferentially on the base for connecting the inner hole of the base to facilitate the discharge of gas in the liquid collecting bottle.

[0010] On the basis of the above scheme, the valve core assembly includes a piston assembly used in cooperation with the base, a threaded rod arranged at the lower part of the piston assembly, and a buoyancy piece arranged on the threaded rod for floating on the waste liquid in the liquid collecting bottle to change the relative position of the piston assembly in the base by the change of liquid level.

[0011] On the basis of the above scheme, the piston assembly includes a piston head matched with the inner cavity of the base and a piston rod connected with the threaded rod.

[0012] On the basis of the above scheme, the piston rod is integrally formed with the threaded rod, and the length of the threaded rod is twice the length of the piston rod.

[0013] On the basis of the above scheme, further comprising: two adjusting nuts arranged on the threaded rod for clamping the buoyancy piece.

[0014] On the basis of the above scheme, the number of vent holes is 2-12.

[0015] On the basis of the above scheme, further comprising: a limiting support pin arranged at the bottom of the base for radially supporting the piston rod while allowing the piston rod to move axially freely.

[0016] On the basis of the above scheme, two groups of through holes are arranged on the base near the bottom surface for inserting the limiting support pin to limit the axial movement range of the piston assembly.

[0017] On the basis of the above scheme, the two groups of through holes are arranged at the same horizontal plane and the center connecting lines of the two groups of through holes are perpendicular to each other or are not at the same horizontal plane and the center connecting lines of the two groups of through holes are perpendicular to each other but do not intersect.

[0018] In addition, the utility model provides a negative pressure suction thrombus removing system, including vacuum pump, filter, negative pressure sensor, liquid collecting bottle, the automatic stop valve of waste liquid full overflow prevention that sets up on the port of liquid collecting bottle for connecting pneumatic element and the suction catheter that sets up on the port of liquid collecting bottle for connecting suction catheter.

[0019] Compared with prior art device, the utility model is applied to negative pressure suction thrombus removing system, when appearing liquid collecting bottle close full overflow condition, stop valve will immediately automatic cut off gas circuit, and vacuum pump will also appear the change of sound because of the sudden increase of gas circuit load, emit high frequency whine, as early warning to operator, thereby realize effective protection to gas circuit element in thrombus suction process, the device simple structure, easy manufacturing, low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0021] Figure 1 It is a structural schematic view of prior art negative pressure suction thrombus removing system;

[0022] Figure 2 It is a structural schematic view of automatic stop valve of waste liquid full overflow prevention in embodiment 1;

[0023] Figure 3 It is the bottom view of Figure 2 ;

[0024] Figure 4 It is the A-A section view of Figure 3 ;

[0025] Figure 5 It is the structural schematic view of valve seat in embodiment 1 (showing vent hole and through hole);

[0026] Figure 6 It is the structural schematic view of valve core assembly in embodiment 1;

[0027] Figure 7Structure diagram of the automatic cut-off valve against waste liquid overflow in Example 1, wherein (a) is the state that the center lines of the two groups of through holes intersect with each other perpendicularly in the same X-Z plane; (b) is the state that the center lines of the two groups of through holes do not intersect with each other perpendicularly in different X-Z planes;

[0028] Figure 8 Working principle diagram of the automatic cut-off valve against waste liquid overflow in Example 1, wherein (a) is the state that the liquid level is low and the valve is in a fully open state; (b) is the state that the liquid level is a little high and the valve is in a partially open state; (c) is the state that the liquid level is high and the valve is in a fully closed state;

[0029] Figure 9 Structure diagram of the assembly state of the automatic cut-off valve and the liquid collecting bottle in Example 2. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0031] Example 1

[0032] As shown in the drawings, Figures 2-4 The present application provides a specific embodiment of an automatic cut-off valve against waste liquid overflow, which comprises a valve seat 1 for conducting gas arranged on the exhaust outlet of a liquid collecting bottle, and a valve core assembly 2 arranged in the valve seat 1 for controlling the on-off of the gas passage of the valve seat 1 by axial movement in the valve seat 1.

[0033] As a specific embodiment, the valve seat 1 comprises a pagoda-shaped joint 1-1 for communicating with the exhaust outlet of the liquid collecting bottle and a base 1-2 arranged at the bottom of the pagoda-shaped joint 1-1 for accommodating the valve core assembly 2 to control whether to conduct with the joint 1-1 by axial movement. As a preferred embodiment of the valve seat 1, the joint 1-1 and the base 1-2 are integrally formed.

[0034] Specifically, the base 1-2 is a thin-walled cylindrical cavity shape, and a plurality of vent holes 1-2-1 are arranged circumferentially on the base 1-2 for connecting the inner hole of the base 1-2 to facilitate the discharge of gas in the liquid collection bottle, and preferably, the length direction of the vent hole 1-2-1 is in the same direction as the axial direction of the base 1-2. In use, the gas in the liquid collection bottle is discharged from the liquid collection bottle through these narrow vent holes 1-2-1 and enters the pneumatic circuit.

[0035] The layout of the circumferential narrow vent holes 1-2-1 is uniformly distributed along the circumferential wall of the base 1-2, which can be a plurality of narrow slits or a small number of wide slits, such as Figure 5 The number of vent holes 1-2-1 can vary between 2-12, and can be adaptively selected according to actual needs in use. The specific reason is that when the number of vent holes 1-2-1 is too large (>12), the circumferential width of each vent hole 1-2-1 is correspondingly reduced, which will increase the flow resistance when the gas flows through, which is not conducive to the suction operation; when the number of vent holes 1-2-1 is too small (<2), it is easy to cause the circumferential scouring force of the gas flow to the head of the piston assembly 2-1 to be uneven, increasing the friction of the head of the piston assembly 2-1 in the cylindrical cavity and causing the risk of the stop valve being stuck or even failing.

[0036] As shown in Figure 6 As a specific embodiment, the valve core assembly 2 includes a piston assembly 2-1 used in cooperation with the base 1-2, a threaded rod 2-2 arranged at the lower part of the piston assembly 2-1, and a buoyancy piece 2-3 arranged on the threaded rod 2-2 for floating on the waste liquid in the liquid collection bottle to change the relative position of the piston assembly 2-1 in the base 1-2 by the change of the liquid level. In this embodiment, the piston assembly 2-1 includes a piston head 2-1-1 matched with the inner cavity of the base 1-2 and a piston rod 2-1-2 connected with the threaded rod 2-2, and the piston head 2-1-1 enables the piston assembly 2-1 to slide axially in the inner cavity of the base 1-2 without leaking gas. As a preferred scheme, the piston rod 2-1-2 is integrally formed with the threaded rod 2-2, and the length of the threaded rod 2-2 is twice the length of the piston rod 2-1-2.

[0037] In order to fix the float 2-3 on the threaded rod 2-2 and adjust the relative distance between the float 2-3 and the piston assembly 2-1 according to the requirement of the liquid level margin in the collecting bottle, two adjusting nuts 2-4 are arranged on the threaded rod 2-2 to clamp the float 2-3. The valve core assembly 2 is the moving part of the valve, which blocks the gas passage in the valve seat 1 when it moves to the upper top surface of the inner cavity of the base 1-2 and adheres to the upper top surface. The float 2-3 is a lightweight thin sheet structure with a certain hardness, and has a circular hole with a diameter slightly larger than that of the threaded rod 2-2 in the center. The float 2-3 can be fixed on the threaded rod 2-2 by clamping through the two adjusting nuts 2-4. After the valve is assembled, the piston head 2-1-1 and the piston rod 2-1-2 (i.e. the smooth part) of the piston assembly 2-1 move in the cylindrical cavity of the base 1-2, and the threaded rod 2-2 is always outside the base 1-2 during the movement of the piston, so that the threaded part does not contact the limiting support pin 1-3 and hinder the axial movement of the piston assembly 2-1. By tightening the two adjusting nuts 2-4 at different heights, the float 2-3 can be fixed at the height, and different safety margins are left to prevent the collecting bottle from overflowing.

[0038] In order to limit the lowest position of the piston assembly 2-1 in the base 1-2, a limiting support pin 1-3 is arranged at the bottom of the base 1-2. This design limits the position by the limiting support pin 1-3 instead of using a solid bottom surface. On the one hand, a larger gap is left at the lower end of the base 1-2 to facilitate the droplets and a small amount of thrombus fragments accumulated in the inner cavity of the valve seat 1 to easily fall into the collecting bottle through the gap; on the other hand, for the consideration of assembly convenience: if a solid bottom surface is used, a plurality of bolts and nuts are needed to fix the solid bottom surface at the lower end of the valve seat 1, which makes the structure of the valve more complex and the assembly more difficult.

[0039] As shown in Figure 5 Two groups of through holes 1-2-2 are arranged on the base 1-2 near the bottom surface, which penetrate the side wall of the cylindrical cavity. Each group of through holes 1-2-2 is two rectangular cross-section holes parallel to each other, and the through holes 1-2-2 are used to insert the limiting support pin 1-3 to limit the axial movement range of the piston assembly 2-1. As shown in Figure 7As shown, the limiting support pin 1-3 is an elongated rod structure with a rectangular cross-section and its size matches the through hole at the lower end of the valve seat, and for the convenience of assembly, its four axial edges are all rounded. When assembling, the piston assembly 2-1 is placed into the cylindrical cavity of the base 1-2, and the limiting support pin 1-3 is inserted into any one set of through holes. The two inner sides of the two limiting support pins 1-3 opposite to each other can form a certain radial support to the piston rod 2-1-2, preventing the piston assembly 2-1 from tilting excessively and causing the piston head 2-1-1 to be stuck in the cylindrical cavity of the base 1-2, thereby affecting the upward and downward movement of the piston assembly 2-1 along the axial direction. At the same time, the upper surfaces of the two limiting support pins 1-3 also constitute the limit position when the piston assembly 2-1 moves downward. When the piston assembly 2-1 moves downward until the lower surface of the piston head 2-1-1 contacts the upper surface of the two limiting support pins 1-3, the downward movement of the piston assembly 2-1 will be stopped, preventing the piston assembly 2-1 from falling out of the valve seat 1.

[0040] As shown in Figure 7 As an embodiment of the position of the through hole 1-2-2, as shown in (a), the center lines of the two sets of through holes 1-2-2 at the lower end of the base 1-2 are on the same horizontal plane and perpendicular to each other, specifically, the center line of one set of through holes is parallel to the X-axis, and the center line of the other set of through holes is parallel to the Z-axis, and the two sets of through holes are in the same X-Z plane but perpendicular to each other. This is to facilitate the insertion of the limiting support pin 1-3 into any one set of through holes 1-2-2 during the assembly of the valve, so as to achieve the limiting and supporting of the piston assembly 2-1 without intentionally rotating the valve seat 1 to a specific angle to complete the assembly of the valve.

[0041] If one set of limiting support pins 1-3 is still insufficient to prevent the piston assembly 2-1 from tilting laterally, as another embodiment of the position of the through hole 1-2-2, as shown in Figure 7 (b), the center lines of the two sets of through holes 1-2-2 are not arranged on the same horizontal plane, but are staggered in the vertical direction, and the limiting support pin 1-3 is inserted into both sets of through holes 1-2-2. At this time, the center lines of the two sets of through holes are still perpendicular to each other, but are in different X-Z planes, so the center lines of the two sets of through holes do not intersect. In this way, more reliable radial support can be provided to the piston rod 2-1-2 to prevent the piston assembly 2-1 from tilting laterally at any angle.

[0042] For economic and processing convenience considerations, the valve seat 1 of the stop valve designed in the application can be molded by injection molding, and plastic or aluminum can be used as the valve body material. The limiting support pin 1-3 is made of high-strength lightweight material, such as engineering plastic or aluminum alloy material. The valve core assembly 2 needs to float on the surface of the waste liquid and float upwards with the rising of the waste liquid surface during the suction plug operation, so it needs to be made of high-strength lightweight material with a density less than water, such as low-density polyethylene (LDPE), which is processed by mold injection molding.

[0043] The utility model discloses an automatic cut-off suction pneumatic circuit when the liquid collecting bottle is close to full, prevent the waste liquid from entering the air path and damaging the pneumatic element, thereby playing the role of effectively protecting the system safety. Figure 8 The basic principle is as shown in the figure. The valve seat 1 is used for fixed connection with the exhaust outlet on the liquid collecting bottle for connecting the pneumatic element, and the valve core assembly 2 is used as the part of the stop valve moving up and down in the axial direction, and the position changes with the change of the waste liquid surface. The valve core assembly 2 is made of material with high strength and hardness and a density less than water, so it can float on the liquid surface.

[0044] When the waste liquid surface in the liquid collecting bottle is very low, the lower end of the buoyancy piece 2-3 does not contact the liquid surface at all, at this time, the valve core assembly 2 is in the lowest position, and is completely supported by the limiting support pin 1-3 at the lower end of the valve seat 1, as shown in Figure 8 (a), at this time, the stop valve is in a completely open state, and the air in the liquid collecting bottle can flow through the air hole 1-2-1 on the lower side of the valve seat 1 and be discharged from the liquid collecting bottle through the joint 1-1 of the valve seat 1.

[0045] With the accumulation of waste liquid in the liquid collecting bottle, the liquid surface rises and contacts the part with a larger area of the buoyancy piece 2-3, and the generated buoyancy lifts the piston assembly 2-1 to rise and partially closes the stop valve, as shown in Figure 8 (b), at this time, the stop valve is in a partially open state, and the air in the liquid collecting bottle can still flow through the residual gap opening to be discharged from the liquid collecting bottle.

[0046] With the continuous accumulation of waste liquid in the liquid collecting bottle, the liquid surface further rises and lifts the piston assembly 2-1 to be flush with the upper top surface of the inner cavity of the base 1-2 of the valve seat 1, the stop valve is completely closed, the air path is cut off, and the flow rate becomes zero, as shown in Figure 8 (c), at this time, on the one hand, the stop valve cuts off the air path, the suction action is stopped, the liquid surface of the waste liquid does not continue to rise, so it will not cause damage to the upstream element, on the other hand, the vacuum pump deviates from its normal working state because the generated suction flow rate becomes zero, and often emits a high-frequency screeching sound, which can effectively warn the operator and remind the operator to intervene.

[0047] Embodiment 2

[0048] The embodiment provides a specific implementation of the negative pressure suction plug system according to the automatic cut-off valve for preventing waste liquid overflow in the embodiment 1. In actual use, the bottle cap of the liquid collecting bottle is removed before starting the operation, a silica gel tube with a proper inner diameter and wall thickness is used to connect the upper end valve seat of the automatic cut-off valve of the design to the bottle inner part of the bottle cap connected to the upstream air path of the bottle cap connection mouth, as shown in Figure 9 , then the bottle cap is screwed, the liquid collecting bottle is connected to the pulsating suction system, the system is started to work, and the operation is started. Figure 1

[0049] Different working conditions of the automatic cut-off valve in the operation are listed in (a)-(c) in Figure 8 , if the liquid collecting bottle is close to overflow, as shown in Figure 8 (c), the cut-off valve will be automatically cut off immediately, and the vacuum pump will also change in sound due to the sudden increase of the air path load, and high-frequency whistling will be emitted.

[0050] The automatic cut-off valve of the design realizes effective protection of the air path elements in the thrombus suction process.

[0051] The connector 1-1 is specifically in the shape of a tower connector, which is convenient for connecting with the exhaust outlet of the liquid collecting bottle.

[0052] The automatic cut-off valve for preventing waste liquid overflow provides a simple, practical, automatic and effective cut-off valve design to solve the element safety and operation safety problems when the liquid collecting bottle is full.

[0053] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model claims and equivalent technologies, the utility model also intends to include these modifications and variations.​

Claims

1. An automatic shutoff valve to prevent spillage of waste fluid, characterized by: The valve seat (1) for conducting gas connected with the exhaust outlet of the collecting bottle and the valve core assembly (2) arranged in the valve seat (1) for controlling the on-off of the gas passage of the valve seat (1) by axial movement in the valve seat (1); The valve seat (1) comprises a joint (1-1) for connecting with the exhaust outlet of the collecting bottle and a base (1-2) arranged at the bottom of the joint (1-1) for accommodating the valve core assembly (2) to control whether to connect with the joint (1-1) by axial movement. A plurality of vent holes (1-2-1) are arranged on the base (1-2) in the circumferential direction for connecting the inner hole of the base (1-2) to facilitate the discharge of gas in the collecting bottle.

2. The automatic shut-off valve to prevent waste fluid overflow according to claim 1, characterized by, The valve core assembly (2) comprises a piston assembly (2-1) used in cooperation with the base (1-2), a threaded rod (2-2) arranged at the lower part of the piston assembly (2-1), and a buoyancy piece (2-3) arranged on the threaded rod (2-2) for floating on the waste liquid in the collecting bottle to change the relative position of the piston assembly (2-1) in the base (1-2) by the change of liquid level.

3. The automatic shut-off valve against waste liquid overflow according to claim 2, characterized in that, The piston assembly (2-1) comprises a piston head (2-1-1) matched with the inner cavity of the base (1-2) and a piston rod (2-1-2) connected with the threaded rod (2-2).

4. The automatic shut-off valve according to claim 3, wherein The piston rod (2-1-2) is integrally formed with the threaded rod (2-2), and the length of the threaded rod (2-2) is twice the length of the piston rod (2-1-2).

5. The automatic shut-off valve to prevent liquid waste overflow according to claim 2, characterized by, Further comprising: Two adjusting nuts (2-4) arranged on the threaded rod (2-2) for clamping the buoyancy piece (2-3).

6. The automatic shut-off valve of claim 1, wherein The number of vent holes (1-2-1) is 2-12.

7. The automatic shut-off valve against liquid waste overflow according to claim 3, characterized by Further comprising: A limiting support pin (1-3) arranged at the bottom of the base (1-2) for radially supporting the piston rod (2-1-2) while allowing the piston rod (2-1-2) to move axially freely.

8. The automatic shut-off valve against waste liquid overflow according to claim 7, characterized in that, Two groups of through holes (1-2-2) are arranged on the base (1-2) near the bottom surface for inserting the limiting support pin (1-3) to define the axial movement range of the piston assembly (2-1).

9. The automatic shut-off valve against liquid waste overflow according to claim 8, characterized in that, The two groups of through holes (1-2-2) are arranged at the same horizontal plane, and the center connecting lines of the two groups of through holes (1-2-2) intersect each other perpendicularly, or the two groups of through holes (1-2-2) are not arranged at the same horizontal plane, and the center connecting lines of the two groups of through holes (1-2-2) are perpendicular to each other but do not intersect.

10. A negative pressure wound therapy system comprising: The automatic cut-off valve for preventing waste liquid overflow according to any one of claims 1-9 is arranged on the port of the collecting bottle for connecting with the pneumatic element, and the suction conduit is arranged on the port of the collecting bottle for connecting with the suction conduit.

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