Circulating suction device and system

Abstract

The invention provides a circulating suction device and system, and relates to the technical field of medical instruments, the circulating suction device comprises a perfusion mechanism, a first pressure sensor and an on-off control mechanism; the on-off control mechanism is connected with the perfusion mechanism, the suction catheter and the thrombus collection device through pipelines, and the first pressure sensor is arranged between the on-off control mechanism and the suction catheter; wherein the on-off control mechanism is used for controlling the on-off state of the pipeline; the perfusion mechanism is used for providing perfusion liquid for a pipeline between the suction catheter and the on-off control mechanism; the first pressure sensor is used for measuring the pressure value of the pipeline between the suction catheter and the on-off control mechanism. The device has the thrombus breaking capacity, the thrombus movement control capacity and the suction catheter blockage dredging capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a circulating suction device and system. Background Art

[0002] Deep vein thrombosis refers to the formation of blood clots in the veins, which can occur in any deep vein. Generally, deep vein thrombosis occurs in the lower limbs or pelvis, but it can also occur in the upper limbs, abdominal veins or brain. Current treatments for deep vein thrombosis usually include anticoagulant therapy, catheter-directed thrombolytic therapy (CDT) and mechanical thrombus aspiration therapy.

[0003] Regarding mechanical thrombus aspiration treatment, existing mechanical thrombus aspiration devices have the following problems: they do not have the ability to break up thrombi and are insufficient in aspirating subacute thrombi; they do not have the ability to control the movement of thrombi within the catheter; and they cannot solve the problem of catheter blockage and unblocking. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a circulatory suction device and system, which has the ability to break up thrombus, control thrombus movement and clear suction catheter blockage.

[0005] In a first aspect, an embodiment of the present invention provides a cyclic suction device, comprising: an infusion mechanism, a first pressure sensor, and an on-off control mechanism; The on-off control mechanism is connected to the perfusion mechanism, the suction catheter, and the thrombus collection device through pipelines, and the first pressure sensor is arranged between the on-off control mechanism and the suction catheter; Among them, the on-off control mechanism is used to control the on-off state of the pipeline; the perfusion mechanism is used to provide perfusion liquid for the pipeline between the suction catheter and the on-off control mechanism; the first pressure sensor is used to measure the pressure value of the pipeline between the suction catheter and the on-off control mechanism.

[0006] In one embodiment, the pipeline includes a main pipeline and a branch pipeline, and the on-off control mechanism includes a suction on-off control mechanism and an infusion on-off control mechanism; The suction on-off control mechanism is arranged on the main pipeline, and the suction on-off control mechanism is used to control the on-off state of the main pipeline between the suction catheter and the thrombus collection device; the first pressure sensor is arranged between the suction on-off control mechanism and the suction catheter; The perfusion on-off control mechanism is arranged on the branch pipeline to connect the perfusion mechanism to the main pipeline between the suction catheter and the suction on-off control mechanism through the branch pipeline. The perfusion on-off control mechanism is used to control the on-off state between the perfusion mechanism and the main pipeline.

[0007] In one embodiment, the working mode of the cyclic suction device includes a thrombus fragmentation mode, and the perfusion on-off control mechanism and the suction on-off control mechanism in the thrombus fragmentation mode are in an interlocking relationship; The perfusion on-off control mechanism controls the branch side pipeline to be disconnected, and the suction on-off control mechanism controls the main pipeline to be connected; or, the perfusion on-off control mechanism controls the branch side pipeline to be connected, and the suction on-off control mechanism controls the main pipeline to be disconnected.

[0008] In one embodiment, the working mode of the cyclic suction device includes a thrombus movement control mode, and the perfusion on-off control mechanism and the suction on-off control mechanism in the thrombus movement control mode are in a linkage relationship; The perfusion on-off control mechanism controls the conduction of the branch side pipeline, and the suction on-off control mechanism controls the conduction of the main pipeline; The time during which the branch pipeline is turned on by the perfusion on-off control mechanism is shorter than the time during which the main pipeline is turned on by the suction on-off control mechanism.

[0009] In one embodiment, the perfusion mechanism operates continuously, the perfusion on-off control mechanism controls the branch line to be continuously connected, and the suction on-off control mechanism controls the main line to be indirectly connected; The amount of perfusion liquid provided by the perfusion mechanism during the period when the perfusion on-off control mechanism controls the conduction of the branch pipeline is less than the amount of suction by the thrombus collection device during the period when the suction on-off control mechanism controls the conduction of the main pipeline.

[0010] In one embodiment, the perfusion mechanism is continuously operated, and a pressurized state is maintained between the perfusion mechanism and the perfusion on-off control mechanism; The perfusion volume of the perfusion mechanism is related to the time during which the perfusion on-off control mechanism controls the conduction of the branch line. The perfusion liquid volume of the perfusion mechanism is less than the single aspiration volume of the thrombus collection device.

[0011] In one embodiment, the circulating suction device further includes a second pressure sensor, which is disposed on the branch-side pipeline and is used to measure the pressure value on the branch-side pipeline.

[0012] In one embodiment, the thrombus collection device includes a thrombus collection tank body and a vacuum pump, and the thrombus collection tank body and the vacuum pump are connected via a main pipeline; The circulating suction device also includes a third pressure sensor, which is arranged on the main pipeline and is used to measure the pressure value of the main pipeline between the thrombus collection tank and the vacuum pump.

[0013] In one embodiment, the cyclic suction device further includes a processor, the processor being electrically connected to the first pressure sensor, the second pressure sensor, and the third pressure sensor; The processor is used to identify whether the suction catheter has sucked out a thrombus based on one or more of the pressure values ​​collected by the first pressure sensor, the second pressure sensor, and the third pressure sensor, and / or identify the diameter value of the main line, and the diameter value is negatively correlated with the on-off frequency corresponding to the suction on-off control mechanism.

[0014] In one embodiment, the on-off control mechanism is an integrated on-off control structure, which adopts a two-position three-way valve. The two-position three-way valve is used to control the on-off state of the pipeline between the aspiration catheter and the thrombus collection device, and is used to control the on-off state of the pipeline between the perfusion mechanism and the aspiration catheter.

[0015] In one embodiment, the circulatory suction device also includes a shell, which is used to provide protection for the perfusion mechanism, the first pressure sensor and the on-off control mechanism; or, it is used to provide protection for the perfusion mechanism, the first pressure sensor, the on-off control mechanism, and the thrombus collection device.

[0016] In a second aspect, an embodiment of the present invention further provides a circulating suction system, comprising any one of the circulating suction devices provided in the first aspect.

[0017] The cyclic suction device and system provided by the embodiment of the present invention include: a perfusion mechanism, a first pressure sensor and an on-off control mechanism, wherein the on-off control mechanism is connected to the perfusion mechanism, the suction catheter and the thrombus collection device through pipelines, and the first pressure sensor is arranged between the on-off control mechanism and the suction catheter; wherein the on-off control mechanism is used to control the on-off state of the pipeline; the perfusion mechanism is used to provide perfusion liquid for the pipeline between the suction catheter and the on-off control mechanism; and the first pressure sensor is used to measure the pressure value of the pipeline between the suction catheter and the on-off control mechanism. The above device can use the pressure value to identify the pipeline diameter and whether the suction catheter has sucked a thrombus. In the case of sucking a thrombus, the perfusion mechanism can provide the pipeline with perfusion liquid, and the on-off state of the pipeline can be changed in combination with the on-off control mechanism, so that the perfusion liquid can drive the thrombus in the pipeline to move, thereby realizing the thrombus crushing function and the thrombus movement control function. In addition, when the suction catheter sucks a thrombus and causes blockage, the perfusion liquid can be used to achieve the purpose of unblocking the suction catheter.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of a circulating suction device provided in an embodiment of the present invention; Figure 2 A schematic diagram of the specific structure of a circulating suction device provided in an embodiment of the present invention; Figure 3 A connection diagram of a circulating suction device provided in an embodiment of the present invention; Figure 4 A schematic diagram of a shutter structure provided by an embodiment of the present invention; Figure 5 A schematic diagram of the partial structure of a cyclic suction device in a thrombus fragmentation mode provided by an embodiment of the present invention; Figure 6 A schematic diagram of the partial structure of a cyclic suction device in a thrombus movement control mode provided by an embodiment of the present invention; Figure 7 A schematic diagram of the partial structure of another cyclic suction device in a thrombus motion control mode provided by an embodiment of the present invention; Figure 8 A schematic diagram of the partial structure of a circulatory suction device in a dredging and suction catheter mode provided by an embodiment of the present invention; Fig. 9 A schematic diagram of the partial structure of another circulating suction device in a dredging and suction catheter mode provided by an embodiment of the present invention; Fig.10 A schematic diagram of the specific structure of the circulating suction device provided in an embodiment of the present invention.

[0022] Icons: 1-first pressure sensor; 2-second pressure sensor; 3-third pressure sensor; 4-suction on-off control mechanism; 5-infusion on-off control mechanism; 6-infusion mechanism; 7-main pipeline; 8-branch pipeline; 9-first pipe opening; 10-second pipe opening; 11-third pipe opening; 12-overall on-off control structure. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Deep vein thrombosis refers to the formation of blood clots in the veins. It can occur in any deep vein. Generally, deep vein thrombosis occurs in the lower limbs or pelvis, but it can also occur in the upper limbs, abdominal veins or brain. Deep vein thrombosis is a common clinical complication in trauma and emergency patients, with an annual incidence of about 1 / 1000 people. Due to the particularity of deep vein thrombosis: 1) Deep vein thrombosis often has no special clinical symptoms, and its diagnosis can often only be done through some routine screening, which requires a lot of manpower and medical resources. 2) Lower limb thrombosis can cause pulmonary embolism (PE), causing hemodynamic instability and endangering life. 3) The veins contain venous valves, and treatments such as rotary cutting that are suitable for arteries will destroy the function of the venous valves, resulting in loss of venous transfusion function. At present, the treatments for deep vein thrombosis usually include anticoagulant therapy, catheter-directed thrombolytic therapy (CDT) and mechanical thrombus aspiration therapy.

[0025] Anticoagulant therapy: The role of anticoagulant therapy is to prevent the thrombus from spreading or forming new thrombus, and to create conditions for the opening of collateral circulation to relieve symptoms. The most serious complications during anticoagulant therapy are bleeding and the shedding of old thrombus. Once bleeding and thrombus shedding occur, it will cause serious harm to the patient.

[0026] Catheter-directed thrombolysis (CDT): Catheter-directed thrombolysis (CDT) has become a commonly used treatment for acute DVT. Compared with traditional systemic anticoagulation therapy, it can accelerate thrombus dissolution while effectively reducing bleeding complications. The degree of improvement in the patient's quality of life with thrombolytic therapy is positively correlated with the degree of thrombus dissolution. Although CDT is an effective treatment measure that can relieve the patient's pain, it increases the patient's bleeding complications, especially for patients who have had a recent history of major surgery. The clinical application of CDT is relatively limited, and the thrombolysis effect on old thrombi is poor, which seriously limits the effectiveness of CDT.

[0027] Mechanical thrombus aspiration therapy: Mechanical thrombus aspiration can quickly remove thrombi, improve clinical symptoms, reduce the use of urokinase, and increase the safety of treatment. Improving thrombus removal efficiency, shortening treatment cycles, and expanding the scope of treatment indications while reducing the risk of bleeding are the current directions of clinical research. The typical product is the AngioJet (Boston Scientific) mechanical thrombus removal system, which is a new minimally invasive treatment technology that has been widely used in domestic clinical practice in recent years. It is a thrombus removal system (percutaneous mechanical thrombectomy PMT) that combines drugs and mechanical effects. It mainly uses the principle of fluid dynamics to break up and aspirate thrombi, thereby achieving the effect of quickly removing thrombi and relieving venous obstruction. Literature reports "believe that the AngioJet mechanical thrombus removal system is safe and effective. When used in combination with CDT, it can reduce the dosage of thrombolytic drugs and shorten the hospital stay. The product has the following problems: 1) During the thrombus aspiration process, red blood cells are broken up by the high-speed jet of liquid. Hemoglobinuria, renal damage, and even renal failure occur; 2) During the thrombus aspiration process, the injection speed of the saline used for flushing is uncontrollable. The purpose of flushing the thrombus accurately and forcefully cannot be achieved. 3) The complex structure, many disposable consumables, and high manufacturing costs lead to a high sales price.

[0028] At present, traditional mechanical thrombus aspiration devices have the following defects: viscous thrombi (thrombi with a certain toughness) will block the aspiration catheter and aspiration cannot continue; the structure is complex, there are many disposable consumables, and the manufacturing cost is high, resulting in a high sales price; the control mode is single, and it is impossible to freely switch between automatic and manual functions; the type of thrombi that can be responded to is single, and acute thrombi can be intelligently aspirated, but there is no aspiration ability for subacute thrombi (thrombi with a certain toughness); there is no thrombus crushing function, and the thrombi are crushed before aspiration; the thrombus flow rate in the catheter drops sharply as the aspiration pressure drops after the thrombus enters the catheter, and the aspiration effect becomes worse; after the aspiration catheter aspirates a large amount of thrombi, it is completely blocked, and it does not have the ability to dredge and clear the thrombi in the catheter.

[0029] In order to improve some technical problems, the related art provides a device and method for controlled clot aspiration (patent application publication number CN 112533550 A), and a vacuum aspiration control system for use with a vacuum source and a suction catheter includes a connecting tube, which is configured to connect the vacuum source to the lumen of the suction catheter. The on-off valve is operably coupled to the connecting tube, and the sensing unit is configured to detect the flow in the connecting tube and provide a signal representing the flow. The controller receives the signal to decide whether to open or close the valve. The controller can automatically close the valve to shut off the flow when the flow through the connecting tube is unrestricted or according to a predetermined timing sequence. The controller can also periodically open the closed valve to determine whether the flow has entered an acceptable range. The controller can also use a pressure manipulation component to perform pulsed suction when the flow is restricted or blocked. Also provided is an intermittent thrombus aspiration pump system and a method of use (patent application publication number CN 112316232A), comprising a suction device and a control device, wherein the control device comprises a pressure sensor, an air circuit control valve, a control circuit board, a suction connector and a catheter connector, wherein one end of the catheter connector is connected to the suction catheter, and the other end of the catheter connector is connected to the air circuit control valve and the suction connector in sequence, wherein the pressure sensor is connected to the airway between the catheter connector and the air circuit control valve, and the pressure sensor and the air circuit control valve are electrically connected to the control circuit board, respectively; through the cooperation between the control device and the suction device, the suction action is started only when the suction negative pressure reaches a certain value, thereby realizing intermittent suction, improving the suction force of the suction pump system, reducing the suction time, thereby reducing the patient's bleeding volume, and facilitating the patient's subsequent recovery. However, the applicant has found through research that the prior art still has the following problems: it does not have the ability to break up blood clots and is insufficient in its ability to aspirate subacute blood clots; it does not have the ability to control the movement of blood clots within the catheter; due to structural limitations, all aspiration modes of the blood clot aspiration devices with circulation control on the market need to be operated under the control of a control device, and there is no manually operated aspiration mode. The control mode is single, which makes the operator lack an important choice under special conditions; it cannot solve the problem of catheter blockage and unblocking; and it cannot intelligently distinguish the diameter and length of the catheter.

[0030] Based on this, the present invention provides a circulating suction device and system to improve the above-mentioned problems. The embodiments of the present invention at least have the ability to break up thrombus, control thrombus movement and clear suction catheter blockage.

[0031] To facilitate understanding of this embodiment, a circulating suction device disclosed in an embodiment of the present invention is first described in detail. Figure 1 The structural schematic diagram of a circulating suction device shown includes: an infusion mechanism, a first pressure sensor and an on-off control mechanism.

[0032] In one embodiment, the on-off control mechanism is connected to the perfusion mechanism, the suction catheter, and the thrombus collection device through pipelines, and the first pressure sensor is arranged between the on-off control mechanism and the suction catheter. The perfusion mechanism can be a perfusion pump.

[0033] In one example, the pipeline is divided into a main pipeline and a branch pipeline, and the on-off control mechanism includes a suction on-off control mechanism, the first pressure sensor and the suction on-off control mechanism are connected through the main pipeline, one end of the main pipeline is connected to the suction catheter, and the other end is connected to the thrombus collection device; the perfusion mechanism is connected through the branch pipeline, one end of the branch pipeline is connected to the perfusion liquid storage device, and the other end is connected to the main pipeline between the suction catheter and the suction on-off control mechanism. The perfusion position is located on the side of the on-off control mechanism close to the thrombus.

[0034] In another example, the pipeline is divided into a main pipeline and a branch pipeline, and the on-off control mechanism includes a suction on-off control mechanism and a perfusion on-off control mechanism. The first pressure sensor and the suction on-off control mechanism are connected through the main pipeline, one end of the main pipeline is connected to the suction catheter, and the other end is connected to the thrombus collection device; the perfusion mechanism and the perfusion on-off mechanism are connected through the branch pipeline, and the end of the branch pipeline close to the perfusion mechanism is connected to the perfusion liquid storage device, and the end close to the perfusion on-off mechanism is connected to the main pipeline between the suction catheter and the suction on-off control mechanism. The perfusion position is located on the side of the on-off control mechanism close to the thrombus.

[0035] In another example, the pipeline is divided into a main pipeline and a branch pipeline, and the on-off control mechanism is an overall on-off control mechanism. The first pressure sensor and the overall on-off control mechanism are connected through the main pipeline, one end of the main pipeline is connected to the suction catheter, and the other end is connected to the thrombus collection device; the perfusion mechanism is connected through the branch pipeline, one end of the branch pipeline is connected to the perfusion liquid storage device, and the other end is connected to the overall on-off control mechanism.

[0036] Among them, the on-off control mechanism is used to control the on-off state of the pipeline. Specifically, for the aforementioned suction on-off control mechanism, it is used to control the on-off state of the main pipeline between the suction catheter and the thrombus collection device; for the aforementioned perfusion on-off control mechanism, it is used to control the on-off state of the branch pipeline between the perfusion mechanism and the main pipeline; for the aforementioned overall on-off control mechanism, it is used to control the on-off state of the main pipeline between the suction catheter and the thrombus collection device, and control the on-off state of the branch pipeline between the perfusion mechanism and the main pipeline.

[0037] Among them, the perfusion mechanism is used to provide perfusion liquid for the pipeline between the suction catheter and the on-off control mechanism. By controlling the on-off state of the pipeline through the on-off control mechanism, the perfusion mechanism can drive the movement of thrombus in the main pipeline, thereby realizing the thrombus fragmentation function, thrombus movement control function, and suction catheter unblocking function.

[0038] The first pressure sensor is used to measure the pressure value of the pipeline between the suction catheter and the on-off control mechanism. The pressure value can be used to identify the diameter value of the main pipeline and can also be used to identify whether the suction catheter has sucked a thrombus.

[0039] The circulating suction device provided in the embodiment of the present invention can use the pressure value to identify the pipeline diameter and whether the suction catheter has sucked out a thrombus. In the case of a thrombus being sucked out, a perfusion liquid can be provided to the pipeline through a perfusion mechanism, and the on-off state of the pipeline can be changed in combination with an on-off control mechanism, so that the perfusion liquid can drive the thrombus in the pipeline to move, thereby realizing the thrombus fragmentation function and the thrombus movement control function. In addition, when the suction catheter is blocked due to the suction of a thrombus, the perfusion liquid can be used to clear the suction catheter.

[0040] The purpose of the embodiment of the present invention is to provide a thrombus extraction instrument with cyclic suction (hereinafter referred to as a cyclic suction device), which integrates a cyclic control system and a suction system, and has the characteristics of small size, easy to carry, low cost, etc. The cyclic suction device is composed of a suction on-off control mechanism, an infusion on-off control mechanism, and a pressure sensor, and is used in conjunction with a vacuum pump and connected to a thrombus collection tank of the vacuum pump.

[0041] In one embodiment, the present invention provides Figure 2 A specific structural schematic diagram of a circulating suction device is shown, comprising a first pressure sensor 1, a second pressure sensor 2, a third pressure sensor 3, a suction on-off control mechanism 4, an irrigation on-off control mechanism 5, an irrigation mechanism 6, a main line 7, a branch line 8, a first pipe port 9, a second pipe port 10, and a third pipe port 11.

[0042] The pipeline includes a main pipeline 7 and a branch pipeline 8 , and the on-off control mechanism includes a suction on-off control mechanism 4 and an infusion on-off control mechanism 5 .

[0043] For easier understanding, see Figure 3 A connection schematic diagram of a circulating suction device is shown.

[0044] In one example, Figure 2 , Figure 3 It is shown that the suction on-off control mechanism 4 is arranged on the main pipe 7 . Furthermore, the first pipe port 9 on the main line 7 is connected to a thrombus collection device, which includes a thrombus collection tank body and a vacuum pump. The thrombus collection tank body and the vacuum pump are connected through the main line. The vacuum pump is also a negative pressure pump. Specifically, the first pipe port 9 on the main line 7 is connected to the thrombus collection tank body in the thrombus collection device, and the second pipe port 10 on the main line 7 is provided with a suction line interface for connecting a suction catheter.

[0045] Furthermore, the suction on-off control mechanism 4 is used to control the on-off state of the main pipeline 7 between the suction catheter and the thrombus collection device. Optionally, the suction on-off control mechanism 4 can adopt a solenoid valve, a steering gear push-pull rod, a shutter structure, etc. Among them, the steering gear push-pull rod achieves the on-off effect by squeezing the pipeline; see Figure 4 The schematic diagram of a shutter structure shown in the figure can also achieve the on-off effect by opening and closing the blades in the shutter structure.

[0046] Furthermore, the first pressure sensor 1 is disposed between the suction on-off control mechanism 4 and the suction catheter, and is used to measure the pressure value of the main line 7 between the suction catheter and the thrombus collection device.

[0047] Furthermore, the third pressure sensor 3 is disposed on the main pipeline 7 to measure the pressure value of the main pipeline 7 between the thrombus collection tank and the vacuum pump.

[0048] Furthermore, the first pressure sensor 1 and the third pressure sensor 3 are both negative pressure sensors.

[0049] In one example, Figure 2 , Figure 3 It is also shown that the perfusion on-off control mechanism 5 is arranged on the branch side pipeline 8, so that the perfusion mechanism 6 is connected to the main pipeline 7 between the suction catheter and the suction on-off control mechanism through the branch side pipeline 8, and the perfusion on-off control mechanism 5 is used to control the on-off state between the perfusion mechanism 6 and the main pipeline 7. Optionally, the perfusion on-off control mechanism 5 can adopt a solenoid valve, a steering gear push-pull rod, a shutter structure, etc.

[0050] Furthermore, the third pipe opening 11 of the branch pipeline 8 is used to connect to a perfusion liquid storage device, in which perfusion liquid is stored, and the perfusion mechanism 6 is used to transfer the perfusion liquid to the main pipeline 7 via the branch pipeline 8 .

[0051] Furthermore, the second pressure sensor 2 is disposed on the branch-side pipeline 8, and is used to measure the pressure value on the branch-side pipeline 8. In one example, the second pressure sensor 2 is a liquid pressure sensor.

[0052] In one example, Figure 3A processor is also shown, and the processor is electrically connected to the first pressure sensor 1, the second pressure sensor 2, and the third pressure sensor 3. The processor is used to identify whether the suction catheter has sucked a thrombus, and / or identify the diameter value of the main circuit based on one or more of the pressure values ​​collected by the first pressure sensor 1, the second pressure sensor 2, and the third pressure sensor 3, respectively. The diameter value is negatively correlated with the on-off frequency corresponding to the suction on-off control mechanism. Specifically, it is possible to identify whether the suction catheter has sucked a thrombus based on the pressure difference value between the first pressure sensor 1 and the third pressure sensor 3, and / or identify the diameter value of the main circuit. Specifically, it is also possible to identify whether the suction catheter has sucked a thrombus based on the pressure value detected by any one of the first pressure sensor 1, the second pressure sensor 2, and the third pressure sensor 3, and / or identify the diameter value of the main circuit.

[0053] In addition, the processor is also electrically connected to the suction on-off control mechanism 4, the perfusion on-off control mechanism 5, the perfusion mechanism 6 and the vacuum pump to control the suction on-off control mechanism 4, the perfusion on-off control mechanism 5, the perfusion mechanism 6 and the vacuum pump.

[0054] Optionally, the processor may be a MCU (Microcontroller Unit) processor.

[0055] Based on the above structure, the embodiment of the present invention provides functions that can be realized by the circulating suction device. Specifically: (1) Intelligent identification of pipeline diameter.

[0056] After the first pipe port 9 on the main line 7 is connected to the thrombus collection tank body, when the suction on-off control mechanism 4 is fully opened, the pressure difference between the first pressure sensor 1 and the third pressure sensor 3 is detected, which is equal to the pressure drop value during the vacuum suction process. The pressure drop value is related to the cross-sectional area and length of the main line 7. Under the premise of specifying the length of the main line 7, the pressure drop value caused by the change in the cross-sectional area of ​​the main line 7 increases with the increase of the cross-sectional area of ​​the main line 7, the vacuum pressure drop difference decreases, and the difference between the two pressure sensors also decreases.

[0057] By judging the diameter of the pipeline, the no-load value (reference value of air suction) of the product can be effectively calibrated to determine the switching frequency of the suction on-off control mechanism 4 during the process of thrombus suction.

[0058] (2) Thrombus fragmentation mode. In the thrombus fragmentation mode, the perfusion on-off control mechanism 5 and the suction on-off control mechanism 4 are in an interlocking relationship. The interlocking relationship is that the perfusion on-off control mechanism 5 controls the branch line to be disconnected, and the suction on-off control mechanism 4 controls the main line to be connected; or, the perfusion on-off control mechanism 5 controls the branch line to be connected, and the suction on-off control mechanism 4 controls the main line to be disconnected.

[0059] See also Figure 5 A partial structural schematic diagram of a circulating suction device in a thrombus fragmentation mode is shown. In the suction state, the suction on-off control mechanism 4 is turned on and suction begins. When the pressure difference value between the first pressure sensor 1 and the third pressure sensor 3 is detected to be a thrombus (including three types: acute, mixed, and subacute thrombi, and basic data can be obtained in the laboratory), the perfusion mechanism 6 and the perfusion on-off control mechanism 5 are started; at the same time, the suction on-off control mechanism 4 is closed, and liquid is perfused into the suction catheter. The volume of the perfusion liquid is determined by the opening time of the perfusion mechanism 6 and the suction on-off control mechanism 4, and the volume is much smaller than the lumen volume in the pipeline. The perfusion liquid does not enter the human body, but only stays in the catheter, pushing the thrombus forward so that the thrombus is 1-3 mm away from the suction tube orifice.

[0060] Next, the perfusion mechanism 6 and the perfusion on-off control mechanism 5 are closed, and the suction on-off control mechanism 4 is opened at the same time, so that a small amount of perfusion liquid and blood as well as the thrombus at the tube mouth of the suction catheter are sucked into the suction catheter. Since the thrombus is 1-3 mm away from the tube mouth, when it contacts the tube mouth, the thrombus can be smashed into pieces after contacting and colliding with the tube mouth due to the inertia of negative pressure suction, thereby achieving the purpose of breaking the thrombus.

[0061] The functions provided by the perfusion mechanism 6 and the perfusion on-off control mechanism 5 in the embodiment of the present invention are: using a small amount of perfused liquid to push the thrombus away from the tube opening of the suction catheter, providing an initial distance for momentum conversion.

[0062] It should be noted that the irrigation liquid does not enter the human body during the suction process.

[0063] (3) Thrombus movement control mode. In the thrombus movement control mode, there is a linkage relationship between the perfusion on-off control mechanism and the suction on-off control mechanism. The linkage relationship is: the perfusion on-off control mechanism controls the conduction of the branch line, and the suction on-off control mechanism controls the conduction of the main line; the time that the perfusion on-off control mechanism controls the conduction of the branch line is less than the time that the suction on-off control mechanism controls the conduction of the main line.

[0064] In actual application, the thrombus moves in the main line along the negative pressure direction toward the thrombus collection tank. As the blood ring increases, the thrombus is attracted by greater negative pressure near the vacuum pump, and is less attracted by less negative pressure far away from the vacuum pump.

[0065] Based on this, see Figure 6 FIG. 1 is a schematic diagram of a partial structure of a cyclic suction device in a thrombus movement control mode, wherein the perfusion mechanism 6 and the perfusion on-off control mechanism 5 are opened. Figure 6 The liquid shown will be diverted partly toward the direction of the thrombus in the body to push the thrombus away, and partly close to the suction on-off control mechanism 4 to squeeze the thrombus through the suction on-off control mechanism 4.

[0066] For further information, see Figure 7 A partial structural diagram of a cyclic suction device in another thrombus motion control mode is shown, Figure 7 The movement direction of the perfusion liquid is marked, and the area where the perfusion liquid and thrombus are mixed is also marked. It can be seen that the thrombus can be moved in two directions by the perfusion liquid, part of which is pushed back into the suction catheter, and part of which is squeezed into the thrombus collection tank.

[0067] Furthermore, the perfusion liquid can be physiological saline or the like, and the flow inertia of the liquid is greater than the flow inertia of the thrombus, which can better accelerate the flow of the thrombus to the thrombus collection tank.

[0068] Because the thrombus is viscous, once the thrombus is stationary in the catheter, it will cause the suction catheter to be blocked, thereby directly prolonging the operation time or terminating the operation, or replacing the instrument to increase the treatment cost. Based on this, the opening time of the perfusion mechanism 6 and the perfusion on-off control mechanism 5 can be controlled each time, so that the opening time of the suction on-off control mechanism 4 is greater than the opening time of the perfusion mechanism 6 and the perfusion on-off control mechanism 5, so as to control the thrombus to always maintain a one-way reciprocating motion in the catheter. Reduce friction to always maintain sliding friction between the thrombus and the suction pipeline, reduce the demand for negative pressure attraction, or improve the suction efficiency of negative pressure suction with the same pressure.

[0069] (4) The perfusion mechanism operates continuously, the perfusion on-off control mechanism controls the branch line to be continuously connected, and the suction on-off control mechanism controls the main line to be indirectly connected; the amount of perfusion liquid provided by the perfusion mechanism during the period when the perfusion on-off control mechanism controls the branch line to be connected is less than the amount of suction by the thrombus collection device during the period when the suction on-off control mechanism controls the main line to be connected. In one example, by controlling the branch line to be continuously connected through the perfusion on-off control mechanism, the perfusion mechanism can continuously provide perfusion liquid to the branch line, and by controlling the operating efficiency of the perfusion mechanism, the amount of perfusion liquid continuously provided by the perfusion mechanism to the branch line is changed, so that the amount of perfusion liquid is less than the amount of suction by the thrombus collection device during the period when the suction on-off control mechanism controls the main line to be connected, and the friction can also be reduced to always maintain sliding friction between the thrombus and the suction line, reduce the demand for negative pressure attraction, or improve the suction efficiency of negative pressure suction at the same pressure.

[0070] (5) The perfusion mechanism is in continuous operation, and the perfusion mechanism and the perfusion on-off control mechanism are in a pressurized state; the perfusion volume of the perfusion mechanism is related to the time when the perfusion on-off control mechanism controls the conduction of the branch line, and the perfusion liquid volume of the perfusion mechanism is less than the single suction volume of the thrombus collection device. In one example, by changing the time when the perfusion on-off control mechanism controls the conduction of the branch line, the perfusion liquid volume provided by the perfusion mechanism to the branch line can be adjusted so that the perfusion liquid volume of the perfusion mechanism is less than the single suction volume of the thrombus collection device, and the friction force can be reduced to keep the sliding friction between the thrombus and the suction line at all times, thereby reducing the demand for negative pressure attraction, or improving the suction efficiency of negative pressure suction at the same pressure.

[0071] (6) Increase the flow rate of thrombus in the pipeline.

[0072] Due to the increase of the perfusion liquid, the relative flow rate of the mixed liquid of the thrombus and the perfusion liquid in the main pipe 7 is greatly increased, and the viscous state is changed to a mixed state, which can greatly reduce the operation time.

[0073] (7) Clear the suction catheter.

[0074] See also Figure 8 The schematic diagram of the partial structure of the circulating suction device in the suction catheter unblocking mode is shown. To unblock the suction catheter blocked by thrombus, the suction on-off control mechanism 4 is turned off, and the perfusion mechanism 6 and the perfusion on-off control mechanism 5 are started. The perfusion liquid can be used to flush the thrombus blocking the blood vessel back into the body to achieve the effect of unblocking the catheter. When the first pressure sensor 1 detects a low positive pressure value, it is determined that the suction catheter has been unblocked. Fig. 9 A partial structural diagram of another circulating suction device in a dredging and suction catheter mode is shown, Fig. 9 It shows that the pipeline is filled with perfusion fluid in the unblocked state, and the thrombus is cleared out of the catheter.

[0075] (8) Perfusion mode. The addition of perfusion function can directly perfuse the perfusion fluid into the body to reduce blood loss.

[0076] In one embodiment, the present invention also provides Fig.10 The specific structural schematic diagram of another circulating suction device shown in the figure, the aforementioned on-off control mechanism is an overall on-off control structure 12, the overall on-off control structure 12 adopts a two-position three-way valve, the two-position three-way valve is used to control the on-off state of the pipeline between the suction catheter and the thrombus collection device, and is used to control the on-off state of the pipeline between the perfusion mechanism 6 and the suction catheter. Fig.10 The working principle of the circulating suction device shown can be referred to the aforementioned embodiment, and the embodiment of the present invention will not be described in detail.

[0077] In addition, the circulating suction device further comprises a shell.

[0078] In one example, the housing is used to provide protection for the perfusion mechanism, the first pressure sensor, and the on-off control mechanism. That is, the circulating suction device is used as an independent device, connected to an external suction catheter and an external thrombus collection device. In one embodiment, the circulating suction device at least includes a perfusion mechanism, a first pressure sensor, and an on-off control mechanism. Preferably, the circulating suction device includes Figure 2 or Fig.10 The individual components shown.

[0079] In another example, the shell is used to provide protection for the perfusion mechanism 6, the first pressure sensor 1, the on-off control mechanism, and the thrombus collection device, that is, the circulating suction device and the thrombus collection device are integrated into one.

[0080] In summary, the cyclic suction device provided in the embodiment of the present invention has at least the following characteristics: ① Intelligent identification of catheter diameter, which can automatically call the optimal parameters according to the catheter; ② Thrombus fragmentation mode, which increases the thrombus fragmentation mode by utilizing the movement inertia of the thrombus and the negative water hammer effect; ③ Thrombus movement control in the catheter: adjusting the opening of the perfusion mechanism 6 and the perfusion valve to experimentally control the mixing ratio of blood and thrombus in the suction management; ④ Increasing the flow rate of thrombus in the pipeline; ⑤ Clearing the suction catheter after it is blocked by thrombus.

[0081] On the basis of the above-mentioned embodiments, an embodiment of the present invention provides a circulating suction system, including the circulating suction device provided by the above-mentioned embodiments.

[0082] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the cyclic suction system described above can refer to the corresponding process in the aforementioned embodiment, and will not be repeated here.

[0083] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0085] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A circulating suction device, characterized in that: include: A perfusion mechanism, a first pressure sensor and an on-off control mechanism; The on-off control mechanism is connected to the perfusion mechanism, the suction catheter, and the thrombus collection device through pipelines, and the first pressure sensor is arranged between the on-off control mechanism and the suction catheter; Among them, the on-off control mechanism is used to control the on-off state of the pipeline; the perfusion mechanism is used to provide perfusion liquid for the pipeline between the suction catheter and the on-off control mechanism; the first pressure sensor is used to measure the pressure value of the pipeline between the suction catheter and the on-off control mechanism.

2. The circulating suction device according to claim 1, characterized in that: The pipeline includes a main pipeline and a branch pipeline, and the on-off control mechanism includes a suction on-off control mechanism and an infusion on-off control mechanism; The suction on-off control mechanism is arranged on the main pipeline, and the suction on-off control mechanism is used to control the on-off state of the main pipeline between the suction catheter and the thrombus collection device; the first pressure sensor is arranged between the suction on-off control mechanism and the suction catheter; The perfusion on-off control mechanism is arranged on the branch pipeline to connect the perfusion mechanism to the main pipeline between the suction catheter and the suction on-off control mechanism through the branch pipeline. The perfusion on-off control mechanism is used to control the on-off state between the perfusion mechanism and the main pipeline.

3. The circulating suction device according to claim 2, characterized in that: The working mode of the cyclic suction device includes a thrombus fragmentation mode, and the perfusion on-off control mechanism and the suction on-off control mechanism in the thrombus fragmentation mode are in an interlocking relationship; The perfusion on-off control mechanism controls the branch-side pipeline to be disconnected, and the suction on-off control mechanism controls the main pipeline to be connected; or, the perfusion on-off control mechanism controls the branch-side pipeline to be connected, and the suction on-off control mechanism controls the main pipeline to be disconnected.

4. The circulating suction device according to claim 2, characterized in that: The working mode of the cyclic suction device includes a thrombus movement control mode, and the perfusion on-off control mechanism and the suction on-off control mechanism in the thrombus movement control mode are in a linkage relationship; The perfusion on-off control mechanism controls the conduction of the branch pipeline, and the suction on-off control mechanism controls the conduction of the main pipeline; The time during which the branch pipeline is turned on by the perfusion on-off control mechanism is shorter than the time during which the main pipeline is turned on by the suction on-off control mechanism.

5. The circulating suction device according to claim 2, characterized in that: The perfusion mechanism operates continuously, the perfusion on-off control mechanism controls the branch pipeline to be continuously connected, and the suction on-off control mechanism controls the main pipeline to be indirectly connected; The amount of perfusion liquid provided by the perfusion mechanism during the period when the perfusion on-off control mechanism controls the conduction of the branch pipeline is less than the amount of suction by the thrombus collection device during the period when the suction on-off control mechanism controls the conduction of the main pipeline.

6. The circulating suction device according to claim 2, characterized in that: The perfusion mechanism is in continuous operation, and the perfusion mechanism and the perfusion on-off control mechanism are in a pressurized state; The perfusion volume of the perfusion mechanism is related to the time during which the perfusion on-off control mechanism controls the conduction of the branch pipeline, and the perfusion liquid volume of the perfusion mechanism is less than the single aspiration volume of the thrombus collection device.

7. The circulating suction device according to claim 2, characterized in that: The circulating suction device also includes a second pressure sensor, which is arranged on the branch-side pipeline and is used to measure the pressure value on the branch-side pipeline.

8. The circulating suction device according to claim 2, characterized in that: The thrombus collection device comprises a thrombus collection tank body and a vacuum pump, and the thrombus collection tank body and the vacuum pump are connected via the main pipeline; The cyclic suction device further comprises a third pressure sensor, which is disposed on the main pipe and is used to measure the pressure value of the main pipe between the thrombus collection tank and the vacuum pump.

9. The circulating suction device according to claim 7 or 8, characterized in that: The cyclic suction device also includes a processor, which is electrically connected to the first pressure sensor, the second pressure sensor, and the third pressure sensor; The processor is used to identify whether the suction catheter has sucked a thrombus based on one or more of the pressure values ​​collected by the first pressure sensor, the second pressure sensor, and the third pressure sensor, and / or to identify the diameter value of the main line, wherein the diameter value is negatively correlated with the on-off frequency corresponding to the suction on-off control mechanism.

10. The circulating suction device according to claim 1, characterized in that: The on-off control mechanism is an integrated on-off control structure, and the integrated on-off control structure adopts a two-position three-way valve. The two-position three-way valve is used to control the on-off state of the pipeline between the suction catheter and the thrombus collection device, and is used to control the on-off state of the pipeline between the perfusion mechanism and the suction catheter.

11. The circulating suction device according to claim 1, characterized in that: The circulatory suction device also includes a shell, which is used to provide protection for the perfusion mechanism, the first pressure sensor and the on-off control mechanism; or, used to provide protection for the perfusion mechanism, the first pressure sensor, the on-off control mechanism and the thrombus collection device.

12. A circulating suction system, characterized in that: The circulating suction device comprises the circulating suction device described in any one of claims 1 to 11.

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