Self-adjusting gas-liquid separation valve for suction thrombus removal system
By separating gas-liquid mixtures using a self-regulating gas-liquid separation valve, the problems of high requirements for the volume and airtightness of the collection bottle are solved, improving the flexibility and safety of the suction system, supporting pulsed suction, and reducing system costs.
Patent Information
- Application Number
- CN202423013229.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-06
AI Technical Summary
In existing negative pressure aspiration thrombectomy systems, the volume of the collection bottle is limited, the airtightness requirements are high, and the explosion-proof requirements are strict. In addition, large-volume collection bottles have a large buffering effect on pulsating aspiration, which affects the efficiency and safety of the operation.
Design a self-regulating gas-liquid separator valve, including a three-way valve body and a cover plate with a self-balancing adjustment structure, for separating gas-liquid mixtures, isolating the gas space inside the collection bottle, and reducing the buffering effect on the suction system.
It achieves gas-liquid separation, reduces the requirements for the airtightness and explosion-proofness of the collection bottle, improves the flexibility and safety of the suction system, supports the realization of pulsed suction, and reduces system costs.
Smart Images
Figure CN223799810U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, concretely relates to a kind of self-regulating gas-liquid separation valves for suction thrombectomy system. BACKGROUND
[0002] More and more direct suction thrombectomy by catheter minimally invasive intervention is used in the treatment of acute thrombotic disease, which has the advantages of high recanalization rate, good safety, simple surgical equipment, short operation time and low treatment cost. The early direct suction thrombectomy operation often uses large-caliber syringe to connect the intervention catheter directly for operation, which has the disadvantages of limited operation process by syringe volume, difficult to control the suction pressure accurately, and the need for a dedicated person to operate the syringe. In order to improve the operation effect, negative pressure suction pump is often used in clinical practice to cooperate with regulating valve, filter and liquid collection bottle, etc. to form a negative pressure suction system that can automatically generate and accurately control the suction pressure, which is used to connect the suction catheter to complete the operation of suctioning thrombus. Figure 1 is the structure diagram of the commonly used negative pressure suction thrombectomy system. The thrombus fragments and blood at the embolization vessel are sucked out of the body through the suction catheter in the figure under the action of suction, and enter the liquid collection bottle. Under the action of self-weight, the thrombus fragments and blood waste will fall into the liquid collection bottle and be intercepted, only air, water vapor and a small amount of thrombus fragments and blood droplets flow to the filter of the air path through the outlet of the liquid collection bottle. The filter further filters out water vapor, thrombus fragments and blood droplets, and finally only dry air passes through the filter into the vacuum pump, thereby effectively protecting the expensive and not resistant to liquid and solid pollution vacuum pump.
[0003] As shown in the commonly used negative pressure suction thrombectomy system, Figure 1 In order to ensure that sufficient negative pressure can be applied to the suction catheter, the bottle opening of the liquid collection bottle has high requirements for air tightness, and the liquid collection bottle also needs to meet certain explosion-proof performance requirements. In addition, in order to have enough volume to hold the intercepted mixture of thrombus fragments and blood waste, the liquid collection bottle needs to have a large volume, otherwise it is likely that the operation will be forced to stop when the liquid collection bottle is full during the operation, and the operation will be resumed after the liquid collection bottle is emptied, which will have a negative impact on the treatment process. The use of large-capacity liquid collection bottles can reduce the occurrence of this situation, but it will also cause the system to wait for a long time to empty the air in the liquid collection bottle after the vacuum pump is turned on during the operation, and then sufficient suction negative pressure can be established in the suction catheter to implement thrombus suction operation, which is very unfavorable for clinical rescue operation which needs to open the blocked blood vessel in seconds. Furthermore, recent international frontier research has found that pulsatile suction instead of constant suction can greatly improve the efficiency, effectiveness and safety of the operation. Figure 1The liquid collecting bottle in the above-mentioned background art has a large internal cavity, which can significantly buffer the pulsating flow of the suction air path, and the larger the cavity of the liquid collecting bottle, the greater the buffering effect on the pulsating flow. Thus, even if the negative pressure gas source of the suction system is replaced by a pulsating type, the desired suction pressure pulsation cannot be generated in the suction conduit. The above-mentioned functional requirement conflicts have become one of the bottlenecks restricting the development of suction thrombectomy. Content of the utility model
[0004] The utility model provides a simple, practical, effective for suction thrombectomy system's self -adjusting gas -liquid separation valve to separate from the suction conduit's gas -liquid mixture and intercept liquid mixture waste liquid, simultaneously effectively isolate the gas space in the liquid collecting bottle to eliminate its buffering effect on the pulsating suction pressure, to solve the functional requirement conflict problem of the liquid collecting bottle in the above -mentioned background art, thereby promoting the development of suction thrombectomy technology.
[0005] To realize the above-mentioned technical purpose, the utility model adopts the technical scheme that:
[0006] A self-adjusting gas-liquid separation valve for a suction thrombectomy system, comprising a three-way valve body, the three-way valve body has a first joint, a second joint and a waste liquid discharge pipe at three interfaces respectively, the waste liquid discharge pipe is located directly below the first joint, a through gas-liquid mixture passage is arranged in the first joint, a gas passage is arranged in the second joint, and a waste liquid outlet is arranged at the bottom of the waste liquid discharge pipe; a cover plate for closing the waste liquid outlet is connected to the bottom of the waste liquid discharge pipe, the cover plate is rotatably connected to the waste liquid discharge pipe through a rotating shaft in the middle part, and a self-balancing adjusting structure is arranged on one end of the cover plate away from the waste liquid outlet to make the cover plate in a state of tending to close the waste liquid outlet.
[0007] Further, the lower end surface of the waste liquid discharge pipe is an inclined plane, the waste liquid outlet is close to the lower part of the cover plate, and the self-balancing adjusting structure is arranged on the upper part of the cover plate.
[0008] Further, the self-balancing adjusting structure comprises a bolt, a fastening nut and a counterweight, one end of the bolt is fixed to the middle part of the upper end of the cover plate through the fastening nut, the other end of the bolt is connected with the counterweight, and the counterweight keeps the cover plate in a normally closed state by relying on the self-weight balance.
[0009] Further, the self-balancing adjusting structure further comprises an adjusting nut, the counterweight is movably connected with the bolt, and the adjusting nut is threadedly connected with the bolt, so as to adjust and limit the position of the counterweight along the axial direction of the bolt.
[0010] Further, the included angle between the lower end inclined surface of the waste liquid discharge pipe and the horizontal plane is in the range of 30°-60°.
[0011] Preferably, the included angle between the lower end inclined surface of the waste liquid discharge pipe and the horizontal plane is 45°.
[0012] Preferably, the three-way valve body is in the shape of a "T".
[0013] Preferably, the three-way valve body is in the shape of a "Y".
[0014] Preferably, the second joint is arranged obliquely upward.
[0015] Preferably, the three-way valve body is integrally arranged with the first joint, the second joint and the waste liquid discharge pipe; or the waste liquid discharge pipe is separately formed and assembled with the three-way valve body.
[0016] The self-adjusting gas-liquid separation valve has the following beneficial effects:
[0017] The self-adjusting gas-liquid separation valve is used in a suction plug removal system, separates gas-liquid mixed substances from a distal suction catheter and traps liquid mixture waste liquid, effectively separates a gas suction passage from a gas space in a liquid collecting bottle, so that gas flow of the suction system is not affected by gas in the liquid collecting bottle, and the gas in the liquid collecting bottle no longer buffers the gas flow of the suction system, which lays a solid and necessary foundation for the realization of pulsating suction in hardware.
[0018] The self-adjusting gas-liquid separation valve has a cover plate closing the waste liquid outlet, which tends to close the waste liquid outlet under the action of the self-balancing adjusting structure, and the cover plate is automatically opened and closed based on mechanical balance, so that the structure is simple and reliable and the design is ingenious.
[0019] The self-adjusting gas-liquid separation valve can reduce the requirements for the airtightness and explosion-proofness of the liquid collecting bottle in the suction plug removal system, is safer and more effective, and is conducive to reducing the cost of the system. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor.
[0021] Figure 1 is a structural diagram of a constant pressure suction plug removal system in the prior art;
[0022] Figure 2 is a three-dimensional structural schematic diagram of the self-adjusting gas-liquid separation valve of the present application;
[0023] Figure 3 is a sectional view of Figure 2 ;
[0024] Figure 4 is a mechanical balance analysis schematic diagram of the cover plate at the waste liquid outlet;
[0025] Figure 5 Figure 1 is a schematic diagram of the gas-liquid separation valve and the liquid collecting bottle connected according to the present application.
[0026] The figure marks: 1-first joint, 2-second joint, 3-waste liquid discharge pipe, 4-cover plate, 5-rotating shaft, 6-bolt, 7-fastening nut, 8-counterweight, 9-adjusting nut, 101-liquid collecting bottle, 102-bottle cap, 103-first tower joint, 104-second tower joint, 105-silica gel pipe, 106-exhaust pipe. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application 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 claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.
[0028] A self-adjusting gas-liquid separation valve for a suction plug removal system, as shown in Figures 2-4 includes a three-way valve body, three interfaces of the three-way valve body are respectively provided with a first joint 1, a second joint 2 and a waste liquid discharge pipe 3, the waste liquid discharge pipe 3 is located directly below the first joint 1, a through gas-liquid mixture passage is arranged in the first joint 1, a gas passage is arranged in the second joint 2, and a waste liquid outlet is arranged at the bottom of the waste liquid discharge pipe 3; a cover plate 4 for closing the waste liquid outlet is connected to the bottom of the waste liquid discharge pipe 3, the cover plate 4 is rotationally connected to the waste liquid discharge pipe 3 through a rotating shaft 5 in the middle part, and a self-balancing adjusting structure is arranged at one end of the cover plate 4 away from the waste liquid outlet, so that the cover plate 4 is in a state of tending to close the waste liquid outlet. Preferably, the three-way valve body is in a "T" shape or a "Y" shape, the second joint 2 is arranged obliquely upward, and the gas passage first intersects perpendicularly with the gas-liquid mixture passage at 90 degrees and then tilts upward, so as to reduce the opportunity of waste liquid entering the gas passage.
[0029] Preferably, the lower end face of the waste liquid discharge pipe 3 is an inclined plane, the waste liquid outlet is close to the lower part of the cover plate 4, and the self-balancing adjustment structure is located on the upper part of the cover plate 4. The area of the cover plate 4 is slightly larger than the area of the waste liquid outlet, covering the inclined surface to ensure that the upper surface of the cover plate 4 can tightly seal the waste liquid outlet when it is in contact with the inclined surface of the waste liquid discharge pipe 3. The inclination angle between the lower end inclined surface of the waste liquid discharge pipe 3 and the horizontal plane is in the range of 30°-60°, with 45° being optimal, in order to comprehensively achieve a balance between the sensitivity and stability of the cover plate movement.
[0030] In a preferred embodiment, the self-balancing adjustment structure includes a bolt 6, a fastening nut 7, and a counterweight 8. One end of the bolt 6 is fixed to the middle of the upper end of the cover plate 4 by the fastening nut 7, and the other end of the bolt 6 is connected to the counterweight 8. The counterweight 8 balances the cover plate by its own weight, keeping the cover plate in a normally closed state. Further, the self-balancing adjustment structure also includes an adjusting nut 9. The counterweight 8 is movably connected to the bolt 6, and the adjusting nut 9 is threadedly connected to the bolt 6. The adjusting nut 9 is used to adjust and limit the position of the counterweight 8 along the axial direction of the bolt 6. According to the lever principle, adjusting the position of the counterweight 8 can change the reaction force of the lower end of the cover plate 4 on the waste liquid discharge pipe 3, thereby achieving sensitive control of the mechanical response of the valve body.
[0031] The opening and closing state of the valve depends on the balance of torques generated by various external forces acting on the waste liquid outlet cover. Figure 4 The diagram illustrates different states of torque acting on the cover plate. Since the main body of the waste liquid outlet cover plate is located below the cover plate's rotation axis, the cover plate's own weight G generates a torque M that drives the cover plate to rotate clockwise. G The self-balancing adjustment structure fixed to the upper side of the cover plate generates a torque M that drives the cover plate to rotate counterclockwise under its own weight W. W .like Figure 4 As shown in (a), when there is no waste liquid at the waste liquid outlet, the cover plate should be in a normally closed state. At this time, the suction negative pressure in the valve body will generate a suction force S on the cover plate, and form a torque M that drives the cover plate to rotate counterclockwise. S The cover plate will remain in a critically closed state when the following relationship is satisfied among these three torques:
[0032] ∑M=M S +M W -M G =0 (1)
[0033] If the cover plate always falls off and cannot be closed when there is no waste liquid at the waste liquid outlet, it is necessary to adjust the position of the counterweight and adjusting nut so that they move along the axial direction of the bolt towards the tail end of the bolt until they reach the appropriate position to satisfy the above torque balance relationship. If you want the cover plate to close more tightly in the normally closed position, you can continue to move the counterweight and adjusting nut slightly towards the tail end of the bolt. At this time, the following will occur:
[0034] ∑M=M S +M W -M G >0 (2)
[0035] The cover plate will be pressed against the inclined surface at the lower end of the valve body, thus the inclined surface at the lower end of the valve body will generate a positive pressure N on the upper surface of the cover plate and a corresponding torque M to drive the cover plate to rotate clockwise. N This keeps the cover plate in the closed position overall, thus maintaining a state of torque balance.
[0036] ∑M=M S +M W -M G -M N =0 (3)
[0037] Unlike the critical normally closed state described by formula (1), there is a certain pressing effect between the cover plate and the inclined surface at the lower end of the valve body, so the cover plate is in a more tightly closed state.
[0038] When waste liquid droplets accumulate at the waste liquid outlet, the droplets exert a new external force R on the cover plate under their own gravity, and generate a new torque M. R This ruined it. Figure 4 In (a), the torque balance is achieved, and the resultant torque is no longer zero, causing the cover to rotate clockwise. The clockwise rotation of the cover will have the following four effects: 1. The cover will no longer effectively seal the waste liquid outlet, so waste liquid droplets will flow out of the outlet and run down the upper surface of the cover until they fall off. 2. Both the upper and lower surfaces of the cover will be exposed to the gas space inside the collection bottle, and the suction force S and corresponding torque M exerted by the negative pressure on the cover will increase. S None of these exist anymore. 3. The upper surface of the cover plate no longer contacts the lower inclined surface of the valve body, so the normal force N and torque M of the lower inclined surface of the valve body on the cover plate are no longer present. N All of these disappear. 4. As the distance between the line of action of the cover's own weight and the cover's rotation axis decreases, the resulting torque decreases. Conversely, the distance between the line of action of the heavy object's own weight and the cover's rotation axis increases, resulting in a greater torque. Therefore, the sum of these two torques drives the cover to rotate counterclockwise to counteract the torque M generated by the waste liquid droplets that drives the cover to rotate clockwise. R The resulting negative feedback effect helps the entire system maintain a stable state. Under the action of these torques, the cover plate will rotate to a certain angle and form a new mechanical equilibrium state, as shown in the figure. Figure 4 As shown in (b). At this point, the torque balance relationship is:
[0039] ∑M=M W -M G -M R =0 (4)
[0040] When the droplet is substantially completely out of the waste liquid outlet, the droplet gravity R and the moment M R disappear, the mechanical equilibrium described by equation (4) no longer holds, at this time, under the action of the unbalanced moment generated by the weight of the weight block and the moment generated by the weight of the cover plate, the cover plate is driven to rotate counterclockwise until the upper surface is recombined with the inclined surface of the lower end of the valve body, and then the mechanical equilibrium of the cover plate is restored to the state shown in Figure 4 (a). The above process will be repeated again when the subsequent waste liquid droplet reaches the waste liquid outlet.
[0041] The self-adjusting gas-liquid separation valve of the utility model, the three-way valve body is integrally arranged with the first joint, the second joint and the waste liquid discharge pipe, can be molded by a mold, and plastic or aluminum can be used as the valve body material. Of course, considering the reduction of processing difficulty, a split design can also be used, the waste liquid discharge pipe part is separately manufactured, and then combined and assembled with the upper three-way valve body part with the first joint and the second joint, and fixed by screw connection or welding. The cover plate is made of high-strength lightweight materials such as polycarbonate engineering plastics, and the thickness of the cover plate is reduced as much as possible to improve the sensitivity of the mechanical response of the valve under the condition of meeting the strength and rigidity requirements. The bolt, the fixing nut and the adjusting nut can be made of lightweight metal such as aluminum alloy with certain strength and hardness. The counterweight block can be made of metal with high density such as iron and copper.
[0042] In actual use, as shown in Figure 5 , two tower joints are arranged on the bottle cap 102 of the liquid collecting bottle 101, the first tower joint 103 is connected to the distal end suction conduit, and the second tower joint 104 is connected to the proximal end gas suction passage. First, the bottle cap 102 of the liquid collecting bottle 101 is removed, and a silica gel tube 105 with a suitable inner diameter and wall thickness is used to connect the two upper joints of the self-adjusting gas-liquid separation valve of the design to the inner part of the two tower joints on the bottle cap. The first joint 1 is connected to the first tower joint 103 of the liquid collecting bottle connected to the distal end suction conduit, and the second joint 2 is connected to the second tower joint 104 of the liquid collecting bottle connected to the proximal end gas suction passage, as shown in Figure 5 . Then the bottle cap 102 is screwed on, the liquid collecting bottle is connected to the suction system in Figure 1 , and the system is started to work, so that the suction pressure in the suction conduit can be quickly established, and the thrombus can be sucked.
[0043] Since the self-adjusting gas-liquid separation valve of the present application can separate the gas suction passage from the gas space in the liquid collecting bottle, the air in the bottle cannot be discharged through the gas outlet, in order to prevent the accumulation of waste liquid in the liquid collecting bottle from causing the accumulation and rise of the gas pressure in the bottle, a small hole can be opened on the bottle cap 102 and connected to an exhaust pipe 106, as shown in Figure 5 .
[0044] Without using the self-regulating gas-liquid separation valve of the design, there are certain requirements for the air tightness and explosion-proof of the liquid collecting bottle, and after the gas-liquid separation valve of the design is installed, these requirements are no longer necessary conditions, which is beneficial to reduce the cost of the system. At the same time, the self-regulating gas-liquid separation valve of the design makes the gas flow of the pumping system not affected by the gas in the liquid collecting bottle, and the gas in the liquid collecting bottle no longer forms a buffering effect on the gas flow of the pumping system, which lays a solid and necessary foundation for the realization of pulsating pumping from the hardware. Therefore, the design can effectively solve the problems existing in the prior art pointed out in the technical background part.
[0045] Of course, the utility model also can have other various embodiments, the skilled in the art can make various corresponding changes and deformation according to the utility model without departing from the spirit and essence of the utility model, but these corresponding changes and deformation should all belong to the protection scope of the claims attached to the utility model.
Claims
1. A self-regulating gas-liquid separation valve for use in a suction thrombectomy system, characterized by: The three-way valve body is provided with a first joint (1), a second joint (2) and a waste liquid discharge pipe (3) at three interfaces respectively, the waste liquid discharge pipe (3) is located directly below the first joint (1), a gas-liquid mixed material passage is arranged in the first joint (1), a gas passage is arranged in the second joint (2), and a waste liquid outlet is arranged at the bottom of the waste liquid discharge pipe (3); a cover plate (4) for closing the waste liquid outlet is connected to the bottom of the waste liquid discharge pipe (3), the cover plate (4) is rotationally connected to the waste liquid discharge pipe (3) through a rotating shaft (5) at the middle part, and a self-balancing adjusting structure is arranged at one end of the cover plate (4) away from the waste liquid outlet, so that the cover plate (4) is in a state of tending to close the waste liquid outlet; The lower end surface of the waste liquid discharge pipe (3) is an inclined plane, the waste liquid outlet is close to the lower part of the cover plate (4), and the self-balancing adjusting structure is arranged on the upper part of the cover plate (4); The self-balancing adjusting structure comprises a bolt (6), a fastening nut (7) and a counterweight (8), one end of the bolt (6) is fixed to the middle part of the upper end of the cover plate (4) through the fastening nut (7), the other end of the bolt (6) is connected with the counterweight (8), and the counterweight (8) keeps the cover plate in a normally closed state by relying on the self-weight balance; the self-balancing adjusting structure further comprises an adjusting nut (9), the counterweight (8) is movably connected with the bolt (6), the adjusting nut (9) is threadedly connected with the bolt (6), and the adjusting nut (9) is used for adjusting and limiting the position of the counterweight (8) along the axial direction of the bolt.
2. The self-regulating gas-liquid separation valve for a suction thrombectomy system of claim 1, wherein: The included angle between the lower end inclined surface of the waste liquid discharge pipe (3) and the horizontal plane is in the range of 30°-60°.
3. The self-regulating gas-liquid separation valve for a suction thrombectomy system of claim 2, wherein: The included angle between the lower end inclined surface of the waste liquid discharge pipe (3) and the horizontal plane is 45°.
4. The self-regulating gas-liquid separation valve for a suction thrombectomy system of claim 1, wherein: The three-way valve body is in a "T" shape.
5. The self-regulating gas-liquid separation valve for a suction thrombectomy system of claim 1, wherein: The three-way valve body is in a "Y" shape.
6. A self-regulating gas-liquid separation valve for a suction thrombectomy system according to claim 4 or 5, characterized in that: The second joint (2) is arranged in an inclined upward manner.
7. The self-regulating gas-liquid separation valve for a suction thrombectomy system of claim 1, wherein: The three-way valve body is integrally provided with the first joint (1), the second joint (2) and the waste liquid discharge pipe (3); or the waste liquid discharge pipe (3) is separately formed and combined and assembled with the three-way valve body.