Gas-liquid separation valve and pulse type suction thrombus removal system comprising same

Abstract

The gas-liquid separation valve comprises a valve body, the valve body is provided with a gas-liquid mixture inlet, a waste liquid outlet and a gas outlet, the gas-liquid mixture inlet and the waste liquid outlet form a through channel in the vertical direction, the upper portion of the through channel is the gas-liquid mixture inlet, and the lower portion of the through channel is the waste liquid outlet. A gas passage penetrates through the side wall of the middle of the through passage, the tail end of the gas passage is higher than the through part, and the gas outlet is formed in the tail end of the gas passage; a cover plate used for sealing the waste liquid outlet is arranged at the waste liquid outlet and rotationally connected with the valve body through a rotating shaft, and a supporting structure enabling the cover plate to tend to be in the state of sealing the waste liquid outlet is arranged on the outer side of the cover plate. The gas separation valve is automatically opened and closed based on mechanical balance and used for separating gas-liquid mixtures from the suction guide pipe and intercepting liquid mixture waste liquid, meanwhile, the gas space in the liquid collection bottle is effectively isolated so as to eliminate the buffering effect of the gas space on pulsation suction pressure, and the pulsation suction effect in the suction guide pipe is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a gas-liquid separation valve and a pulsating suction thrombus removal system comprising the gas-liquid separation valve. Background Art

[0002] The clinically recommended treatment for acute vascular embolic diseases is minimally invasive interventional mechanical thrombectomy via catheter. Direct aspiration thrombectomy has excellent clinical application prospects due to its advantages such as high vascular recanalization rate, good safety, simple surgical equipment, short operation time and low treatment cost.

[0003] The direct suction thrombectomy system mainly consists of two parts: a negative pressure source and an interventional catheter. The negative pressure source is usually a large-caliber syringe and a negative pressure suction pump. Current negative pressure suction pumps basically work in a constant suction pressure mode. Figure 1 It is a simplified structural diagram of the constant negative pressure suction embolectomy system.

[0004] Another direct suction embolization system is to change the constant pressure vacuum source to a pulsating vacuum source to generate pulsating suction pressure. Figure 1 The constant pressure vacuum pump in the suction system is replaced by a variable vacuum pump, or an electrically controlled regulating valve is installed between the constant pressure vacuum pump and the filter, and the opening of the electrically controlled regulating valve is periodically changed to generate a pulsating suction pressure. However, this method has problems related to the liquid collection bottle. The vacuum source used to generate the power of the suction system, whether it is a vacuum pump used alone or a composite structure of a vacuum pump and an electrically controlled regulating valve used in combination, is a sensitive component that is not resistant to liquid contamination. During the operation of the suction system, the mixed substances sucked by the suction catheter from the embolic blood vessel include gaseous suction gas and water vapor, and a liquid / solid mixture of blood and thrombus. In the mixture of blood and thrombus, blood is a liquid, soft thrombus is a liquid with a viscosity much greater than that of blood, and hard thrombus can be regarded as a solid. Blood is the main part of the mixture of blood and thrombus, and the thrombus is suspended in the blood, so the physical properties of their mixture are mainly liquid. The function of the liquid collection bottle is to initially separate the gaseous and liquid mixed substances from the suction catheter, intercept and contain the liquid substances in it to prevent it from entering the proximal gas pipeline and vacuum source, thereby avoiding damage to sensitive vacuum source components. The basic structure of the liquid collection bottle is as follows Figure 2As shown. The bottle body is usually made of a sturdy transparent glass bottle, so that it is easy to observe the filling status of the waste liquid in the bottle. The bottle cap and the bottle body are usually sealed with threads to maintain airtightness. The bottle cap has two pagoda connecting nozzles, which are connected to the suction catheter and the vacuum source gas pipeline respectively. The connecting nozzle and the bottle cap are connected and sealed by a seal, also to maintain airtightness. After the gaseous and liquid mixture from the suction catheter enters the liquid collection bottle through the distal connecting nozzle, the liquid substance (mixture of blood and thrombus) therein will automatically fall to the bottom of the liquid collection bottle under the action of gravity, while the gaseous substance (suction gas and water vapor) enters the vacuum source gas pipeline through the proximal gas circuit connecting nozzle. Thereafter, the gaseous substance passes through the filter near the vacuum source outlet to filter out water vapor, and only the suction gas can enter the vacuum source components, thereby effectively protecting the vacuum source.

[0005] It should be noted that, except for the space in the lower part of the liquid collection bottle occupied by the mixture of blood and thrombus, the rest of the space is occupied by gas and water vapor. In the constant pressure suction system, the gas in the liquid collection bottle will delay the establishment of the suction negative pressure to a certain extent, but will not affect the operation of the system after the suction negative pressure is established. However, in the pulsating suction system, these gas and water vapor spaces can buffer and weaken the pressure pulsation generated by the pulsating vacuum source to a large extent. In order to highlight the influence of the liquid collection bottle on the pulsating pressure response, FIG3 takes the pulsating suction system using a variable vacuum pump as an example. If the liquid collection bottle is removed from the pulsating suction system, the pulsating pressure generated by the pulsating vacuum source can be well transmitted to the suction catheter to produce the required pulsating suction pressure change, as shown in FIG3(a). However, such a system cannot intercept liquid substances and protect the vacuum source components, so it cannot be used in practice. After the liquid collection bottle is set in the system of FIG3(a), a complete system as shown in FIG3(b) is formed. Here, the liquid collection bottle can separate gaseous and liquid substances. The liquid blood and thrombus mixture is retained in the lower part of the bottle cavity, but the gas space in the upper part obviously attenuates the pressure pulsation generated by the pulsating vacuum source, as shown in Figure 3(b), which will significantly affect the pulsating thrombus removal conditions expected to be formed in the suction catheter. Therefore, around the liquid collection bottle, intercepting the blood and thrombus mixture and maintaining the suction pressure pulsation become conflicting functional requirements. On the one hand, in order to better protect the vacuum source and prevent the liquid collection bottle from being filled with blood and thrombus mixture during surgery, the volume of the liquid collection bottle should be as large as possible to hold more waste liquid mixture. On the other hand, in order to reduce the buffering effect of the space occupied by gas and water vapor in the upper part of the bottle cavity on the pulsating suction pressure, the volume of the liquid collection bottle should be as small as possible. This contradiction in functional requirements has become a bottleneck restricting the development of pulsating suction thrombus removal technology and has not been resolved. Utility Model Content

[0006] The utility model provides a simple, practical and effective gas-liquid separation valve and a pulsating suction plug removal system including the gas-liquid separation valve, which are used to separate gas-liquid mixture from a suction catheter and intercept waste liquid of the liquid mixture, and at the same time effectively isolate the gas space in the liquid collection bottle to eliminate its buffering effect on the pulsating suction pressure, thereby realizing the pulsating suction effect in the suction catheter.

[0007] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0008] A gas-liquid separation valve comprises a valve body, wherein the valve body is provided with a gas-liquid mixture inlet, a waste liquid outlet and a gas outlet, wherein the gas-liquid mixture inlet and the waste liquid outlet form a through passage in the vertical direction, wherein the upper portion is the gas-liquid mixture inlet, and the lower portion is the waste liquid outlet, wherein a gas passage is provided through the side wall in the middle portion of the through passage, wherein the connecting section of the gas passage and the through passage is perpendicular to the through passage, wherein the rear end of the gas passage is inclined upward, and the gas outlet is provided at the end of the gas passage; wherein a cover plate for closing the waste liquid outlet is provided at the waste liquid outlet, wherein the cover plate is rotatably connected to the valve body via a rotating shaft, and wherein a supporting structure is provided on the outer side of the cover plate so that the cover plate tends to close the waste liquid outlet.

[0009] Furthermore, the lower end surface of the valve body at the waste liquid outlet is an inclined plane, the rotation axis of the cover plate is installed on the top of the inclined surface, and the cover plate covers the inclined surface of the lower end surface of the valve body.

[0010] Furthermore, the inclination angle of the inclined surface at the lower end of the valve body ranges from 30° to 60°.

[0011] Preferably, the inclination angle of the inclined surface at the lower end of the valve body is 45°.

[0012] Furthermore, the support structure also includes a pressing force adjustment structure for adjusting the pressing force of the support structure on the outer side of the cover plate.

[0013] Preferably, the supporting structure comprises an elastic metal sheet (6), the elastic metal sheet (6) comprises a fixing portion (61), a connecting portion (62) and a supporting portion (63) which are connected in sequence, the fixing portion (61) is vertically arranged, the fixing portion (61) is connected to the valve body via an adjusting bolt (7), and the supporting portion (63) abuts against the lower surface of the cover plate (4).

[0014] Furthermore, the clamping force adjustment structure comprises two adjusting nuts (8), the adjusting nuts (8) are adapted to the adjusting bolts (7), the fixing portion (61) of the elastic metal sheet (6) is provided with a connecting hole, the hole diameter of the connecting hole is larger than the diameter of the adjusting bolt (7), and the two adjusting nuts (8) are clamped on both sides of the elastic metal sheet (6); the adjusting bolts (7) are rotated to change the depth of the fixing portion (61) of the elastic metal sheet (6) being screwed into the valve body, and the horizontal distance between the fixing portion (61) of the elastic metal sheet (6) and the valve body is adjusted, thereby adjusting the clamping force of the supporting portion (63) of the elastic metal sheet (6) on the outer side of the cover plate (4).

[0015] Another preferred embodiment is that the supporting structure comprises an adjusting baffle (10) and a double torsion spring (9); the adjusting baffle (10) is in the shape of a flat plate; the adjusting baffle (10) is connected to the valve body via an adjusting bolt (7); the two spring coils (92) of the double torsion spring (9) are respectively mounted on the rotating shaft (5) on both sides of the upper end of the cover plate (4); the inner arm (91) of the double torsion spring (9) abuts against the outer surface of the adjusting baffle (10); and the outer arm (93) of the double torsion spring (9) abuts against the lower surface of the cover plate (4).

[0016] Furthermore, the clamping force adjustment structure comprises two adjusting nuts (8), and the adjusting nuts (8) are adapted to the adjusting bolts (7); a connecting hole having an outer diameter larger than that of the adjusting bolts (7) is provided on the adjusting baffle (10), and the two adjusting nuts (8) are clamped on both sides of the adjusting baffle (10); the adjusting bolts (7) are rotated to change the depth of the adjusting bolts (7) screwed into the valve body, thereby adjusting the horizontal distance between the adjusting baffle (10) and the valve body, thereby adjusting the clamping force of the outer arm (93) of the double torsion spring (9) on the outer side of the cover plate (4).

[0017] A pulsating suction thrombus removal system including the above-mentioned gas-liquid separation valve comprises a pulsating negative pressure source, a filter, and a liquid collecting bottle which are connected in sequence through pipelines, a negative pressure sensor is arranged between the filter and the liquid collecting bottle; two pagoda joints are arranged on the bottle cap of the liquid collecting bottle, the first pagoda joint outside the liquid collecting bottle is connected to the gas suction passage, the second pagoda joint is connected to the suction catheter passage, the gas-liquid separation valve is connected between the two pagoda joints in the liquid collecting bottle through an elastic hose, the second pagoda joint is connected to the gas-liquid mixture inlet of the gas-liquid separation valve through the elastic hose, and the first pagoda joint is connected to the gas outlet of the gas-liquid separation valve through the elastic hose; an exhaust pipe is arranged on the bottle cap.

[0018] The beneficial effects of the utility model are:

[0019] The gas-liquid separation valve of the utility model is used in a pulsating plug removal system. The cover plate used for closing the waste liquid outlet tends to close the waste liquid outlet under the action of the supporting structure. The cover plate automatically opens and closes based on mechanical balance to separate the gas-liquid mixture from the suction duct and intercept the liquid mixture waste liquid. At the same time, it effectively isolates the gas space in the liquid collecting bottle to eliminate its buffering effect on the pulsating suction pressure, thereby realizing the pulsating suction effect in the suction duct.

[0020] In the gas-liquid separation valve of the utility model, the supporting structure has various forms, and the pressing force of the cover plate on the waste liquid outlet is flexibly adjustable to meet the needs of various scenarios.

[0021] The pulsating suction plug removal system of the utility model adopts the above-mentioned gas-liquid separation valve, which can separate the gas suction passage from the gas space in the liquid collecting bottle. When used for pulsating suction, there is no requirement for the airtightness of the liquid collecting bottle itself, which can reduce the sealing performance requirements of related connecting parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a simplified structural diagram of the constant pressure suction embolism removal system;

[0024] Figure 2 It is a schematic diagram of the structure of the liquid collecting bottle;

[0025] Fig. 3 (a) is a schematic diagram showing the structure and pressure response comparison of a variable vacuum pump pulsating suction system without a liquid collection bottle;

[0026] FIG3( b ) is a schematic diagram showing the structure and pressure response comparison of a variable vacuum pump pulsating suction system with a liquid collecting bottle;

[0027] Figure 4 This is a schematic diagram of the structural design of the gas-liquid separation valve of the utility model;

[0028] Figure 5 yes Figure 4 A cross-sectional schematic diagram of

[0029] Figure 6 yes Figure 5 A partial enlarged schematic diagram of the dotted line frame in the middle;

[0030] Figure 7 This is another structural design schematic diagram of the gas-liquid separation valve of the utility model;

[0031] Figure 8 yes Figure 7 A partial cross-sectional view of

[0032] Fig. 9 It is a schematic diagram of the structure of a double torsion spring;

[0033] Fig.10 It is a schematic diagram of mechanical balance analysis of the cover plate at the waste liquid outlet;

[0034] Fig.11 This is a schematic diagram of the connection between the gas-liquid separation valve and the liquid collecting bottle of the utility model;

[0035] FIG. 12( a ) and FIG. 12( b ) are schematic diagrams of the pulsating suction thrombus removal system of the present invention.

[0036] Figure markings: 1-gas-liquid mixture inlet, 2-waste liquid outlet, 3-gas outlet, 4-cover plate, 5-rotating shaft, 6-elastic metal sheet, 61-fixing part, 62-connecting part, 63-supporting part, 7-adjusting bolt, 8-adjusting nut, 9-double torsion spring, 91-inner arm, 92-spring coil, 93-outer wall, 10-adjusting baffle, 101-filter, 102-liquid collecting bottle, 103-first pagoda connector, 104-second pagoda connector, 105-elastic hose, 106-exhaust pipe, 107-connecting piece, 108-servo variable vacuum pump, 109-constant vacuum pump, 110-electrically controlled regulating valve. DETAILED DESCRIPTION

[0037] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

[0038] A gas-liquid separation valve, such as Figure 4-Figure 8As shown, it includes a valve body, which is provided with a gas-liquid mixture inlet 1, a waste liquid outlet 2 and a gas outlet 3. The gas-liquid mixture inlet 1 and the waste liquid outlet 2 form a through passage in the vertical direction, the upper part is the gas-liquid mixture inlet 1, the lower part is the waste liquid outlet 2, a gas passage is penetrated through the side wall in the middle of the through passage, the connecting section of the gas passage and the through passage is perpendicular to the through passage, the rear end of the gas passage is inclined upward, and the gas outlet 3 is arranged at the end of the gas passage; a cover plate 4 for closing the waste liquid outlet is provided at the waste liquid outlet 2, the cover plate 4 is rotatably connected to the valve body through a rotating shaft 5, and a supporting structure is provided on the outer side of the cover plate 4 to make the cover plate tend to close the waste liquid outlet.

[0039] Furthermore, the lower end face of the valve body at the waste liquid outlet 2 is an inclined plane, and the rotating shaft 5 of the cover plate 4 is installed on the top of the inclined surface. The area of ​​the cover plate 4 is slightly larger than the inclined surface of the lower end face of the valve body, and the inclined surface is covered to ensure that the upper surface of the cover plate 4 can tightly block the waste liquid outlet 2 when it is in contact with the inclined surface of the lower end face of the valve body. The inclination angle of the inclined surface at the lower end of the valve body is in the range of 30°-60°, with 45° being the best, so as to comprehensively achieve a balance between the sensitivity and stability of the cover plate movement. Furthermore, the support structure also includes a clamping force adjustment structure, which adjusts the clamping force of the support structure on the outer side of the cover plate 4 to achieve control of the sensitivity of the mechanical response of the valve.

[0040] In one embodiment, the support structure comprises an elastic metal sheet 6, such as Figure 4 , Figure 5 , Figure 6 As shown, the elastic metal sheet 6 includes a fixing portion 61, a connecting portion 62 and a supporting portion 63 connected in sequence, the fixing portion 61 is vertically arranged, the fixing portion 61 is connected to the valve body through an adjusting bolt 7, and the supporting portion 63 abuts against the lower surface of the cover plate 4. Preferably, the cross-sections of the connecting portion 62 and the supporting portion 63 are spiral-shaped. The elastic metal sheet 6 can be made of a metal material with a high elastic modulus, tensile strength, appropriate hardness, and good fatigue resistance, such as a cobalt-based alloy or high-strength stainless steel. Further, the clamping force adjustment structure is as follows Figure 6 As shown, it includes two adjusting nuts 8, which are adapted to the adjusting bolt 7. The fixing portion of the elastic metal sheet 6 is provided with a connecting hole, the hole diameter of the connecting hole is larger than the diameter of the adjusting bolt 7, and the two adjusting nuts 8 are clamped on both sides of the fixing portion 61 of the elastic metal sheet 6. A gap is left between the two adjusting nuts 8 and the fixing portion 61 of the elastic metal sheet. When the adjusting bolt 7 is rotated, the distance between the elastic metal sheet 6 and the valve body can be changed in the horizontal direction without causing the elastic metal sheet 6 to rotate with the adjusting bolt 7. By screwing the adjusting bolt 7 into the threaded hole of the valve body at different depths, the deformation degree of the elastic metal sheet 6 can be changed, thereby effectively controlling the size of the pressing force on the cover plate 4 at the waste liquid outlet.

[0041] In another embodiment, the support structure is as follows Figure 7 , Figure 8 , Fig. 9 As shown, it includes an adjusting baffle 10 and a double torsion spring 9. The adjusting baffle 10 is in a flat plate shape and is connected to the valve body through an adjusting bolt 7. The two spring coils 92 of the double torsion spring 9 are respectively sleeved on the rotating shaft 5 on both sides of the upper end of the cover plate 4. The inner arm 91 of the double torsion spring 9 abuts against the outer surface of the adjusting baffle 10, and the outer arm 93 of the double torsion spring 9 abuts against the lower surface of the cover plate 4. The clamping force adjustment structure is as shown in FIG. Figure 8 As shown, it includes two adjusting nuts 8, which are adapted to the adjusting bolt 7. The adjusting baffle 10 is provided with a connecting hole slightly larger than the outer diameter of the adjusting bolt 7, and the two adjusting nuts 8 are clamped on both sides of the adjusting baffle 10; a gap is left between the two adjusting nuts 8 and the adjusting baffle 10, so that when the adjusting bolt 7 is rotated, the distance between the adjusting baffle 10 and the valve body can be changed in the horizontal direction without causing the adjusting baffle to rotate with the adjusting bolt 7. By screwing the adjusting bolt 7 into the threaded hole of the valve body to different depths, the torsion degree of the double torsion spring coil 92 can be changed, thereby effectively controlling the magnitude of the pressing force on the cover plate 4 at the waste liquid outlet.

[0042] The cover plate 4 has a tendency to rotate clockwise downward under the action of its own gravity, and the support structure in contact with the lower surface of the cover plate has the effect of pushing the cover plate to rotate counterclockwise upward. In addition, the suction negative pressure in the valve body will exert suction on the cover plate and cause it to rotate counterclockwise upward; when the rotational torque in the two directions is balanced, the upper surface of the cover plate at the waste liquid outlet can be kept in close contact with the lower end surface of the valve body to block the waste liquid outlet. The movement and force of the waste liquid outlet cover plate under different working conditions can be seen in Fig.10 .like Fig.10 As shown in (a), when there is no waste liquid at the waste liquid outlet, the main external forces acting on the cover plate include the suction force S generated by the suction negative pressure in the valve body, the pressing force F of the support structure on the lower surface of the cover plate, the positive pressure N on the upper surface of the cover plate when the lower end of the valve body is inclined, and the gravity G acting on the cover plate. They respectively generate a torque M that drives the cover plate to rotate counterclockwise. S and M F And the clockwise torque M N and M G When these moments are balanced,

[0043] ∑M=M S +M F -M G -M N =0

[0044] When the cover plate is in a critical contact state with the inclined surface at the lower end of the valve body, the cover plate just blocks the waste liquid outlet.

[0045] When waste liquid droplets accumulate at the waste liquid outlet, the droplets exert a new external force W on the cover plate under the action of their own gravity and form a new torque M. W This destroys Fig.10 The torque in (a) is balanced, and the resultant torque is no longer zero and will drive the cover to rotate clockwise. The clockwise rotation of the cover will have the following four effects: 1. The cover no longer effectively blocks the waste liquid outlet, so the waste liquid drops flow out of the outlet and flow down along the upper surface of the cover until they fall. 2. The upper and lower surfaces of the cover are exposed to the gas space in the liquid collection bottle, and the suction force S and the corresponding torque M of the cover are generated by the negative pressure. S 3. The upper surface of the cover plate no longer contacts the lower inclined surface of the valve body, so the lower inclined surface of the valve body exerts a positive pressure N and a moment M on the cover plate. N All of them disappear. However, at the rotation axis of the cover, due to the unbalanced force, the rotation axis will generate a new positive pressure N on the cover, but the line of action of this new positive pressure N passes through the rotation axis of the cover, so no torque is formed on the cover. 4. The support structure is compressed and deformed more, so the pressing force on the lower surface of the cover increases. The gravity and corresponding torque on the cover still exist. Under these mechanical effects, the cover will rotate to a certain angle and form a new mechanical balance. The corresponding mechanical balance is as follows: Fig.10 (b). At this time, the torque balance relationship is:

[0046] ∑M=M F -M G -M W =0

[0047] When the droplet has basically completely flowed out of the waste liquid outlet, the droplet gravity W and the moment M W disappear, Fig.10 The mechanical equilibrium in (b) is no longer maintained. At this time, the moment M F Under the action of the rotation of the cover plate, the cover plate is driven to rotate counterclockwise until the upper surface is in contact with the inclined surface of the lower end of the valve body again, and the mechanical balance of the cover plate is restored to the state as shown in FIG. Fig.10 When the subsequent waste liquid droplets reach the waste liquid outlet, the above process will be repeated again.

[0048] For economical and convenient processing, the valve body of the gas-liquid separation valve can be molded by injection molding, using plastic or aluminum as the valve body material. The cover plate 4 is made of high-strength and lightweight materials such as engineering plastics such as polycarbonate, and the thickness of the cover plate 4 is minimized to provide the mechanical response sensitivity of the valve while meeting the strength and deformation requirements.

[0049] A pulsating suction thrombus removal system comprising the above-mentioned gas-liquid separation valve, such as Fig.11As shown in Figure 12, it includes a negative pressure source, a filter 101, and a liquid collecting bottle 102 which are connected in sequence through pipelines. A negative pressure sensor is arranged between the filter 101 and the liquid collecting bottle 102. Two pagoda joints are arranged on the bottle cap of the liquid collecting bottle 102. The first pagoda joint 103 outside the liquid collecting bottle 102 is connected to the gas suction passage, and the second pagoda joint 104 is connected to the suction duct passage. A gas-liquid separation valve is connected between the two pagoda joints in the liquid collecting bottle 102 through an elastic hose 105. The second pagoda joint 104 is connected to the gas-liquid mixture inlet of the gas-liquid separation valve through the elastic hose 105. The first pagoda joint 103 is connected to the gas outlet of the gas-liquid separation valve through the elastic hose 105. The elastic hose 105 has a certain wall thickness and hardness to ensure the sealing and strength of the connection; the elastic hose 105 is preferably a silicone tube. The negative pressure source can be a servo variable vacuum pump 108, as shown in FIG12(a); or a constant vacuum pump 109, with an electrically controlled regulating valve 110 disposed between the constant vacuum pump 109 and the filter 101, as shown in FIG12(b). Furthermore, an exhaust pipe 106 is disposed on the bottle cap to prevent the accumulation and increase of gas pressure in the bottle when waste liquid accumulates in the liquid collection bottle 102.

[0050] In the pulsating suction thrombus removal system of the present design, the suction catheter passage, the gas-liquid separation valve and the gas suction passage form an air flow channel. When used for pulsating suction, the air tightness of the liquid collection bottle itself is no longer required, so the two pagoda joints can be fixed on the bottle cap through ordinary connecting parts 107, and there is no need to use seals to connect the pagoda joints.

[0051] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A gas-liquid separation valve, characterized in that: The valve body comprises a valve body, wherein the valve body is provided with a gas-liquid mixture inlet (1), a waste liquid outlet (2) and a gas outlet (3); the gas-liquid mixture inlet (1) and the waste liquid outlet (2) form a through passage in the vertical direction, the upper part is the gas-liquid mixture inlet (1), the lower part is the waste liquid outlet (2), a gas passage is through-through the side wall in the middle of the through passage, the gas passage and the through passage connecting section are perpendicular to the through passage, the rear end of the gas passage is inclined upward, and the gas outlet (3) is arranged at the end of the gas passage; a cover plate (4) for closing the waste liquid outlet is arranged at the waste liquid outlet (2), the cover plate (4) is rotatably connected to the valve body via a rotating shaft (5), and a supporting structure is arranged on the outer side of the cover plate (4) so ​​that the cover plate tends to close the waste liquid outlet.

2. The gas-liquid separation valve according to claim 1, characterized in that: The lower end surface of the valve body at the waste liquid outlet (2) is an inclined plane, the rotating shaft (5) of the cover plate (4) is installed on the top of the inclined surface, and the cover plate (4) covers the inclined surface of the lower end surface of the valve body.

3. The gas-liquid separation valve according to claim 2, characterized in that: The inclination angle range of the inclined surface at the lower end of the valve body is 30°-60°.

4. The gas-liquid separation valve according to claim 3, characterized in that: The inclination angle of the inclined surface at the lower end of the valve body is 45°.

5. The gas-liquid separation valve according to claim 1, characterized in that: The support structure also includes a pressing force adjustment structure for adjusting the pressing force of the support structure on the outer side of the cover plate (4).

6. The gas-liquid separation valve according to claim 5, characterized in that: The supporting structure comprises an elastic metal sheet (6), the elastic metal sheet (6) comprises a fixing portion (61), a connecting portion (62) and a supporting portion (63) which are connected in sequence, the fixing portion (61) is vertically arranged, the fixing portion (61) is connected to the valve body via an adjusting bolt (7), and the supporting portion (63) abuts against the lower surface of the cover plate (4).

7. The gas-liquid separation valve according to claim 6, characterized in that: The clamping force adjustment structure comprises two adjustment nuts (8), the adjustment nuts (8) are adapted to the adjustment bolts (7), the fixing portion (61) of the elastic metal sheet (6) is provided with a connection hole, the hole diameter of the connection hole is larger than the diameter of the adjustment bolt (7), and the two adjustment nuts (8) are clamped on both sides of the elastic metal sheet (6); the depth of the adjustment bolt (7) screwed into the valve body is changed by rotating the adjustment bolt (7), and the horizontal distance between the fixing portion (61) of the elastic metal sheet (6) and the valve body is adjusted, thereby adjusting the clamping force of the support portion (63) of the elastic metal sheet (6) on the outer side of the cover plate (4).

8. The gas-liquid separation valve according to claim 5, characterized in that: The supporting structure comprises an adjusting baffle (10) and a double torsion spring (9); the adjusting baffle (10) is in the shape of a flat plate and is connected to the valve body via an adjusting bolt (7); two spring coils (92) of the double torsion spring (9) are respectively sleeved on the rotating shaft (5) at both sides of the upper end of the cover plate (4); the inner arm (91) of the double torsion spring (9) abuts against the outer surface of the adjusting baffle (10); and the outer arm (93) of the double torsion spring (9) abuts against the lower surface of the cover plate (4).

9. The gas-liquid separation valve according to claim 8, characterized in that: The clamping force adjustment structure comprises two adjustment nuts (8), and the adjustment nuts (8) are adapted to the adjustment bolts (7); a connection hole having an outer diameter larger than that of the adjustment bolts (7) is provided on the adjustment baffle (10), and the two adjustment nuts (8) are clamped on both sides of the adjustment baffle (10); the depth of the adjustment bolts (7) screwed into the valve body is changed by rotating the adjustment bolts (7), and the horizontal distance between the adjustment baffle (10) and the valve body is adjusted, thereby adjusting the clamping force of the outer arm (93) of the double torsion spring (9) on the outer side of the cover plate (4).

10. A pulsating suction thrombus removal system comprising the gas-liquid separation valve according to any one of claims 1 to 9, characterized in that: The invention also comprises a pulsating negative pressure source, a filter (101), and a liquid collecting bottle (102) which are connected in sequence through pipelines, and a negative pressure sensor is arranged between the filter (101) and the liquid collecting bottle (102); two pagoda joints are arranged on the bottle cap of the liquid collecting bottle (102); a first pagoda joint (103) outside the liquid collecting bottle (102) is connected to a gas suction passage, and a second pagoda joint (104) is connected to a suction conduit passage; a gas-liquid separation valve is connected between the two pagoda joints inside the liquid collecting bottle (102) through an elastic hose (105); the second pagoda joint (104) is connected to a gas-liquid mixture inlet of the gas-liquid separation valve through the elastic hose (105), and the first pagoda joint (103) is connected to a gas outlet of the gas-liquid separation valve through the elastic hose (105); and an exhaust pipe (106) is arranged on the bottle cap.

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