Thrombus filtering device

Abstract

The utility model relates to the technical field of thrombus filtering, and discloses a thrombus filtering device which comprises an equipment liquid inlet pipeline, an equipment liquid outlet pipeline and a thrombus filtering pipeline, a valve is further arranged at the liquid inlet of the equipment liquid inlet pipeline; the filtering assembly is used for filtering blood entering the thrombus filtering device; the equipment liquid outlet pipeline is used for conveying the filtered blood back to the living body; the driving mechanism is communicated with the equipment liquid inlet pipeline; in the blood filtering process, the driving mechanism generates negative pressure in the liquid inlet pipeline of the equipment so as to drive blood to flow through the opened valve and enter the filtering assembly to filter thrombus; in the blood conveying process, the driving mechanism generates positive pressure in the equipment liquid inlet pipeline, the valve is closed, and blood enters the equipment liquid outlet pipeline from the equipment liquid inlet pipeline and returns to the living body. By means of the structure, thrombus can be filtered, filtered blood drawn out of the body is re-infused into the body of a patient, and then the problem of blood waste is avoided.

Description

Technical Field

[0001] This utility model relates to the field of thrombus filtration technology, specifically to a thrombus filtration device. Background Technology

[0002] A thrombus is a small piece of blood that forms inside a blood vessel. It is mainly formed by the aggregation of platelets or fibrinogen. After a thrombus forms inside a blood vessel, it can easily narrow the inner wall of the vessel, thereby increasing blood pressure. In severe cases, it can easily cause blockage of the blood vessel. Therefore, when a thrombus accumulates in a blood vessel, it is necessary to treat the thrombus in the blood vessel in a timely manner.

[0003] In existing technologies, arterial embolism or venous thrombosis in distal small blood vessels is typically treated with thrombectomy. Thromboaspiration uses catheters, sheaths, or other devices to remove the thrombus from the body using negative pressure suction. For example, patent application CN117017419A discloses a thrombectomy catheter. This catheter, in conjunction with an auxiliary suction catheter, can remove the thrombus. However, the aforementioned thrombectomy catheters in the prior art are difficult to filter thrombi. More importantly, the blood withdrawn cannot be reinfused into the patient, thus avoiding the problem of wasting blood. Utility Model Content

[0004] This invention aims to provide a thrombus filtration device to address the problem in existing thrombus aspiration catheters that cannot simultaneously filter thrombi and prevent the extracted blood from being reinfused into the patient, thus avoiding blood waste. Therefore, this invention provides a thrombus filtration device comprising:

[0005] The device's inlet pipe is connected to a blood vessel and is used to introduce blood into the thrombus filtration device; the inlet of the device's inlet pipe is also equipped with a valve to prevent thrombus backflow.

[0006] A filtration assembly is disposed on the flow path of the liquid inlet pipe of the device and is used to filter the blood entering the thrombus filtration device.

[0007] The equipment's outlet pipe has one end connected to the blood vessels of the organism and the other end connected to the outlet of the equipment's inlet pipe, used to return the filtered blood to the organism.

[0008] A drive mechanism is connected to the inlet pipe of the device. During blood filtration, the drive mechanism generates negative pressure in the inlet pipe of the device to drive blood to flow through the opened valve and enter the filter assembly to filter blood clots. During blood transport, the drive mechanism transports blood from the inlet pipe of the device to the outlet pipe of the device and finally returns it to the body.

[0009] Optionally, the valve is a one-way valve body formed by combining multiple pieces, with the pieces facing the outlet of the liquid inlet pipe of the device;

[0010] When blood is driven to flow into the thrombus filtration device from the device's inlet line, the valve is driven to open; when blood flows in the reverse direction from the device's inlet line toward the human body, the valve is driven to close.

[0011] Optionally, the filtering component includes:

[0012] A filter screen, the pore size of which is smaller than the diameter of the blood clot to filter blood clots from the blood;

[0013] A collection bag, disposed between the filter and the valve, is used to contain the filtered blood clot.

[0014] Optionally, the filtering component further includes:

[0015] A filter element is disposed on the side of the filter screen facing the liquid outlet of the device's inlet pipe, and is used to filter microbubbles and microthrombi in the blood.

[0016] Optionally, the recycling bag is detachably installed on the liquid inlet line of the device.

[0017] Optionally, the device's inlet pipe is connected to the blood vessels of the organism and fixed by elastic fasteners; and / or, the device's outlet pipe is connected to the blood vessels of the organism and fixed by elastic fasteners.

[0018] The elastic fastener is an elastic sleeve that is fitted onto the connection between the liquid inlet pipe of the device and the blood vessel of the organism, or onto the connection between the liquid outlet pipe of the device and the blood vessel of the organism.

[0019] Optionally, the drive mechanism includes:

[0020] A piston rod, which is slidably disposed within the liquid inlet pipe of the equipment, and has a piston pushing end made of flexible material facing the liquid inlet of the liquid inlet pipe of the equipment;

[0021] A drive unit, connected to the piston rod, drives the piston rod to reciprocate within the device's inlet pipe. During blood filtration, the piston rod moves away from the inlet, reducing the pressure within the inlet pipe between the piston rod's piston-driven end and the valve, causing the valve to open and allow blood to pass through the filtration assembly. During blood delivery, the piston rod moves closer to the inlet, increasing the pressure within the inlet pipe between the piston rod and the valve, causing the valve to close, deforming the piston-driven end and creating a gap between the piston-driven end and the inlet pipe. Blood passes through this gap into the device's outlet pipe and returns to the body.

[0022] Optionally, the piston pushing end is a semi-circular or semi-elliptical structure facing the liquid inlet.

[0023] Optionally, the piston pushing end is a plate-like structure disposed at the end of the piston rod, and the outer contour edge of the plate-like structure abuts against the inner wall of the liquid inlet pipe of the device.

[0024] Optionally, the piston rod is composed of two connecting rods; the plate-like structure consists of two pieces, and the central position of the plate-like structure is connected to the corresponding connecting rod.

[0025] Optionally, the driving unit is a drive motor; the drive motor is a servo motor.

[0026] Optionally, the drive mechanism includes:

[0027] A worm gear is driven to rotate circumferentially within the inlet pipe of the device; the blood enters the pipe section where the worm gear is located through the gap between adjacent rotating teeth of the worm gear, and the worm gear transports the blood from the inlet pipe of the device to the outlet pipe of the device and finally returns it to the body.

[0028] A drive unit, connected to the worm gear transmission, drives the worm gear to rotate; during the blood filtration process, the worm gear is driven to rotate continuously in one direction, storing blood in the gap between adjacent teeth of the worm gear, the pressure in the device inlet line between the worm gear and the valve decreases, and the valve opens to allow blood to pass through the filtration assembly;

[0029] During the blood transport process, the worm gear is driven to rotate circumferentially within the inlet pipe of the device; the blood enters the pipe section where the worm gear is located through the gap between adjacent rotating teeth of the worm gear, and the worm gear transports the blood from the inlet pipe of the device to the outlet pipe of the device and finally returns it to the body.

[0030] Optionally, a first variable diameter pipe section is provided on the liquid inlet pipe of the device between the filter assembly and the drive mechanism; the first variable diameter pipe section is a necked structure extending toward the liquid outlet of the liquid inlet pipe of the device.

[0031] On the liquid outlet pipe of the device, near the blood supply end of the liquid outlet pipe and the blood vessel of the organism, a second variable diameter pipe section is provided; the second variable diameter pipe section is a neck-expanding structure facing the blood supply end.

[0032] Optionally, the device's liquid outlet line is a flexible tube to facilitate blood flow.

[0033] The technical solution of this utility model has the following advantages:

[0034] 1. The thrombus filtration device provided by this utility model includes:

[0035] The device's inlet pipe is connected to a blood vessel and is used to introduce blood into the thrombus filtration device; the inlet of the device's inlet pipe is also equipped with a valve to prevent thrombus backflow.

[0036] A filtration assembly is disposed on the flow path of the liquid inlet pipe of the device and is used to filter the blood entering the thrombus filtration device.

[0037] The equipment's outlet pipe has one end connected to the blood vessels of the organism and the other end connected to the outlet of the equipment's inlet pipe, used to return the filtered blood to the organism.

[0038] The drive mechanism is connected to the inlet pipe of the device; during the blood filtration process, the drive mechanism generates negative pressure in the inlet pipe of the device to drive blood to flow through the opened valve and enter the filter assembly to filter blood clots; during the blood transport process, the drive mechanism transports blood from the inlet pipe of the device to the outlet pipe of the device and finally returns it to the body.

[0039] In this invention, a valve is installed at the inlet of the device's inlet pipe. This valve effectively prevents backflow of thrombi and, in conjunction with a drive mechanism, achieves the following: blood containing thrombi is drawn from the body using negative pressure, and after thrombi filtration, the filtered blood is then delivered back into the patient's body using positive pressure. In this invention, the drive mechanism generates negative pressure within the device's inlet pipe during blood filtration, driving blood to flow through the opened valve and into the filtration assembly to filter thrombi, thus completing the thrombi filtration process. Furthermore, in this invention, the drive mechanism also transports blood from the device's inlet pipe to the device's outlet pipe during blood delivery, ultimately returning it to the patient's body.

[0040] 2. The thrombus filtration device provided by this utility model, wherein the valve is a one-way valve body formed by combining multiple pieces, and the pieces are arranged facing the outlet of the inlet pipe of the device;

[0041] When blood is driven to flow into the thrombus filtration device from the device's inlet line, the valve is driven to open; when blood flows in the reverse direction from the device's inlet line toward the human body, the valve is driven to close.

[0042] In this invention, the valve is a one-way valve body formed by assembling multiple pieces. These pieces are positioned facing the outlet of the device's inlet pipe, ensuring that blood can only enter the thrombus filtration device through the inlet of the device's inlet pipe and cannot be reintroduced into the patient's body through the inlet. The blood is filtered only by the filtration assembly and then returned to the body through the outlet pipe. This ensures the stable and reliable operation of the thrombus filtration device.

[0043] 3. The thrombus filtration device provided by this utility model, wherein the filtration component includes:

[0044] A filter screen, the pore size of which is smaller than the diameter of the blood clot to filter blood clots from the blood;

[0045] A collection bag, disposed between the filter and the valve, is used to contain the filtered blood clot.

[0046] In this invention, the aforementioned filter can effectively filter blood clots. Blood flows through the valve and the filter, while the filtered blood clots enter the collection bag, thus completing the blood clot collection process.

[0047] 4. The thrombus filtration device provided by this utility model further includes a filter element, which is disposed on the side of the filter screen facing the liquid outlet of the device's inlet pipe. The filter element can effectively filter microbubbles and microthrombi in the blood.

[0048] 5. In the thrombus filtration device provided by this utility model, the recovery bag is detachably installed on the inlet pipe of the device. In this utility model, the above-mentioned arrangement allows the operator to easily remove the recovery bag from the inlet pipe of the device, thereby completing the replacement of the recovery bag.

[0049] 6. The thrombus filtration device provided by this utility model, wherein the inlet pipe of the device is connected to the blood vessels of the organism and is fixed by elastic fasteners; the outlet pipe of the device is connected to the blood vessels of the organism and is fixed by elastic fasteners;

[0050] The elastic fastener is an elastic sleeve that is fitted onto the connection between the liquid inlet pipe of the device and the blood vessel of the organism, or onto the connection between the liquid outlet pipe of the device and the blood vessel of the organism.

[0051] In this invention, after the inlet and outlet pipes of the device are connected to the blood vessels of the organism, the connection and fixation work can be completed by the aforementioned elastic fasteners, thereby ensuring the stable and reliable operation of the thrombus filtration device.

[0052] 7. The thrombus filtering device provided by this utility model includes a driving mechanism comprising:

[0053] A piston rod, which is slidably disposed within the liquid inlet pipe of the equipment, and has a piston pushing end made of flexible material facing the liquid inlet of the liquid inlet pipe of the equipment;

[0054] A drive unit, connected to the piston rod, drives the piston rod to reciprocate within the device's inlet pipe. During blood filtration, the piston rod moves away from the inlet, reducing the pressure within the inlet pipe between the piston-driven end of the piston rod and the valve, causing the valve to open and allow blood to pass through the filtration assembly. During blood delivery, the piston rod moves closer to the inlet, increasing the pressure within the inlet pipe between the piston-driven end of the piston rod and the valve, causing the valve to close, deforming the piston-driven end and creating a gap between the piston-driven end and the inlet pipe. Blood passes through this gap into the device's outlet pipe and returns to the body.

[0055] In this invention, the drive mechanism needs to generate negative pressure in the inlet pipe of the device, thereby drawing blood containing blood clots out of the body and completing the blood clot filtration process. Afterwards, positive pressure is generated in the inlet pipe of the device, returning the filtered blood to the body through the outlet pipe of the device.

[0056] To achieve the above functions, this utility model provides one specific embodiment. First, a reciprocating piston rod is installed inside the liquid inlet pipe of the equipment. The piston rod has a piston-pushing end made of flexible material. A drive unit drives the piston rod to reciprocate within the liquid inlet pipe of the equipment.

[0057] During the blood filtration process described above, the piston rod moves away from the inlet, increasing the space between the piston rod and the valve. This reduces the pressure inside the inlet pipe between the piston rod and the valve, allowing the blood to pass through the valve and the filtration assembly to complete the filtration process.

[0058] Furthermore, during the blood delivery process described above, the piston rod moves towards the inlet, reducing the space enclosed by the piston rod and the valve, thus increasing the pressure within the device's inlet tubing between the piston rod and the valve. Simultaneously, the valve closes because it prevents blood from flowing backwards. The pressure within the device's inlet tubing between the piston rod and the valve causes the piston's push end to deform, creating a gap between the piston's push end and the device's inlet tubing. Blood passes through this gap into the device's outlet tubing and returns to the body.

[0059] The above-mentioned structure is ingeniously designed, simple and reliable, and can effectively perform the functions of blood filtration and reflux.

[0060] 8. In the thrombus filtration device provided by this utility model, the piston pushing end is a semi-circular or semi-elliptical structure facing the liquid inlet. The piston pushing end of the aforementioned semi-elliptical structure can be a flexible semi-circular structure or a flexible semi-elliptical structure.

[0061] The above structure enables the following: during the blood delivery process, when the pressure in the device's inlet pipe between the piston rod and the valve increases, the piston push end deforms, thereby allowing blood to return to the body from the gap formed between the piston push end and the device's inlet pipe.

[0062] In addition, during the blood filtration process, the piston push end of the above structure will not deform, ensuring that no gap is generated between the piston push end and the liquid inlet pipe of the equipment.

[0063] 9. The thrombus filtration device provided by this utility model, wherein the piston pushing end is a sheet-like structure disposed at the end of the piston rod, and the outer contour edge of the sheet-like structure abuts against the inner wall of the inlet pipe of the device.

[0064] In this invention, the piston pushing end can also be configured as the aforementioned plate-like structure. The plate-like piston pushing end can also achieve the following:

[0065] During the blood delivery process, when the pressure in the device's inlet line between the piston rod and the valve increases, the piston push end deforms, allowing blood to return to the body through the gap formed between the piston push end and the device's inlet line.

[0066] In addition, during the blood filtration process, the piston push end of the above structure will not deform, ensuring that no gap is generated between the piston push end and the liquid inlet pipe of the equipment.

[0067] 10. The thrombus filtering device provided by this utility model, wherein the driving mechanism includes:

[0068] A worm gear, driven to rotate circumferentially within the inlet pipe of the device, transports blood from the inlet pipe to the outlet pipe and ultimately returns it to the body; the blood enters the pipe section containing the worm gear through the gaps between adjacent rotating teeth.

[0069] A drive unit, connected to the worm gear transmission, drives the worm gear to rotate; during the blood filtration process, the worm gear is driven to rotate continuously in one direction, storing blood in the gap between adjacent teeth of the worm gear, the pressure in the device inlet line between the worm gear and the valve decreases, and the valve opens to allow blood to pass through the filtration assembly;

[0070] During the blood transport process, the worm gear is driven to rotate circumferentially within the inlet pipe of the device; the blood enters the pipe section where the worm gear is located through the gap between adjacent rotating teeth of the worm gear, and the worm gear transports the blood from the inlet pipe of the device to the outlet pipe of the device and finally returns it to the body.

[0071] To achieve the above-mentioned functions, this utility model provides another specific embodiment. First, in this utility model, the worm gear rotation action allows blood to enter the inlet pipe of the device where the worm gear is located through the gap between adjacent rotating teeth of the worm gear.

[0072] Unlike the other embodiment described above, where the reciprocating motion of the piston achieves repeated switching between blood filtration and blood delivery, this embodiment continuously performs blood filtration in one stage and continuously performs blood delivery in another stage.

[0073] 11. The thrombus filtration device provided by this utility model, wherein a first variable diameter pipe section is provided on the inlet pipe of the device between the filter component and the drive mechanism; the first variable diameter pipe section is a necked structure extending toward the outlet of the inlet pipe of the device;

[0074] In this invention, the first variable diameter pipe section of the above-mentioned necking structure can effectively increase the blood flow velocity and help the blood to better enter the equipment inlet pipe section where the piston rod is located.

[0075] On the liquid outlet pipe of the device, near the blood supply end of the liquid outlet pipe and the blood vessel of the organism, a second variable diameter pipe section is provided; the second variable diameter pipe section is a neck-expanding structure facing the blood supply end.

[0076] Meanwhile, in this invention, the second variable diameter tube section of the aforementioned neck-expanding structure can effectively reduce the speed of blood flow and help blood flow steadily and slowly into the body. Attached Figure Description

[0077] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0078] Figure 1 A three-dimensional structural diagram of the thrombus filtration device provided by this utility model;

[0079] Figure 2 A schematic diagram of the internal structure of the thrombus filtration device provided by this utility model;

[0080] Figure 3 Provided by this utility model Figure 2 An enlarged schematic diagram of part A in the middle;

[0081] Figure 4 Provided by this utility model Figure 2 Enlarged schematic diagram of part B;

[0082] Figure 5 Provided by this utility model Figure 2 An enlarged schematic diagram of section C;

[0083] Figure 6 A three-dimensional structural diagram of the piston rod in Embodiment 1 provided by this utility model;

[0084] Figure 7 A schematic diagram of the fit between the piston rod and the liquid inlet pipe of the equipment in Embodiment 2 provided by this utility model;

[0085] Figure 8 A schematic diagram of the fit between the worm gear and the equipment inlet pipe in Embodiment 3 of this utility model;

[0086] Figure 9 The worm gear in Embodiment 3 provided by this utility model is shown in the front view.

[0087] Explanation of reference numerals in the attached figures:

[0088] 1-Equipment inlet pipe; 2-Outlet; 3-Filter assembly; 4-Valve; 5-Equipment outlet pipe; 6-Inlet; 7-Filter screen; 8-Recovery bag; 9-Filter element; 10-Elastic fastener; 11-Piston rod; 12-Blood push end; 13-Drive unit; 14-Connecting rod; 15-Worm gear; 16-Rotating gear; 17-First reducing pipe section; 18-Blood supply end; 19-Second reducing pipe section. Detailed Implementation

[0089] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0090] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0091] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0092] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0093] Example 1

[0094] See Figure 1 and Figure 2 , Figure 1 A three-dimensional structural schematic diagram of the thrombus filtering device in an embodiment of this utility model is shown. Figure 2 A schematic diagram of the internal structure of the thrombus filtering device in an embodiment of this utility model is shown.

[0095] A thrombus filtering device is described, comprising:

[0096] The equipment's inlet line 1 is connected to a blood vessel and is used to introduce blood into the thrombus filtration device; for example... Figure 3As shown, a valve 4 for preventing backflow of thrombi is also provided at the inlet 6 of the device's inlet pipe 1; the valve 4 is a one-way valve body formed by the combination of multiple plates, and the plates are arranged facing the outlet 2 of the device's inlet pipe 1; when blood flows into the thrombus filtration device from the device's inlet pipe 1, the valve 4 is driven to open; when blood flows in the reverse direction from the device's inlet pipe 1 toward the human body, the valve 4 is driven to close.

[0097] Filter assembly 3, disposed in the flow path of the inlet pipe 1 of the device, is used to filter blood entering the thrombus filtration device; such as Figure 3 As shown, the filter assembly 3 includes: a filter screen 7, the pore size of which is smaller than the diameter of the thrombus to filter thrombi in the blood; a filter element 9, which is disposed on the side of the filter screen 7 facing the outlet 2 of the device inlet pipe 1, for filtering microbubbles and microthrombi in the blood; and a recovery bag 8, disposed between the filter screen 7 and the valve 4, for containing the filtered thrombi; the recovery bag 8 is detachably installed on the device inlet pipe 1.

[0098] The device's outlet pipe 5 is connected at one end to the blood vessels of the organism and at the other end to the outlet 2 of the device's inlet pipe 1, and is used to return the filtered blood to the organism; the device's outlet pipe 5 is a flexible tube to facilitate blood flow.

[0099] The driving mechanism is connected to the inlet pipe 1 of the device. During the blood filtration process, the driving mechanism generates negative pressure in the inlet pipe 1 of the device to drive the blood to flow through the open valve 4 and enter the filter assembly 3 to filter blood clots. During the blood transport process, the driving mechanism generates positive pressure in the inlet pipe 1 of the device, the valve 4 closes, and the blood enters the outlet pipe 5 of the device from the inlet pipe 1 and returns to the body.

[0100] See Figure 4 and Figure 6 , Figure 4 The present invention is illustrated in the embodiments thereof. Figure 2 Enlarged schematic diagram of part B in the thrombus filtration device; Figure 6 A three-dimensional structural diagram of the piston rod in an embodiment of this utility model is shown.

[0101] In this embodiment, to achieve the following: negative pressure is generated in the inlet pipe 1 of the device, thereby drawing blood containing thrombi from the body and completing the thrombus filtration process. Afterwards, positive pressure is generated in the inlet pipe 1 of the device, returning the filtered blood to the body through the outlet pipe 5 of the device. The specific structure of the drive mechanism is as follows:

[0102] The drive mechanism includes:

[0103] A piston rod 11 is slidably disposed within the liquid inlet pipe 1 of the equipment, and the piston rod 11 has a piston pushing end 12 made of flexible material facing the liquid inlet 6 of the liquid inlet pipe 1 of the equipment; in this embodiment, the piston pushing end 12 is a semi-circular structure facing the liquid inlet 6.

[0104] The drive unit 13 is tractively connected to the piston rod 11 to drive the piston rod 11 to reciprocate within the device's inlet pipe 1. During the blood filtration process, the piston rod 11 moves away from the inlet 6, the pressure within the device's inlet pipe 1 between the piston push end of the piston rod 11 and the valve 4 decreases, and the valve 4 opens to allow blood to pass through the filter assembly 3. During the blood delivery process, the piston rod 11 moves closer to the inlet 6, the pressure within the device's inlet pipe 1 between the piston push end of the piston rod 11 and the valve 4 increases, and the valve 4 closes to deform the piston push end 12 and form a gap between the piston push end 12 and the device's inlet pipe 1. Blood passes through this gap into the device's outlet pipe 5 and returns to the body.

[0105] In this embodiment, as Figure 5 The enlarged view of part C in the schematic diagram of the internal structure of the thrombus filtration device shown.

[0106] The liquid inlet pipe 1 of the device is connected to the blood vessels of the organism and is fixed by the elastic fastener 10;

[0107] The liquid outlet pipe 5 of the device is connected to the blood vessels of the organism and is fixed by the elastic fastener 10;

[0108] The elastic fastener 10 is an elastic sleeve that is fitted onto the connection position between the liquid inlet pipe 1 of the device and the blood vessel of the organism, or onto the connection position between the liquid outlet pipe 5 of the device and the blood vessel of the organism.

[0109] In this embodiment, to ensure that the drive unit 13 stably and reliably drives the piston rod 11 to reciprocate within the liquid inlet pipe 1 of the equipment, the drive unit 13 is a servo motor.

[0110] The motors are selected based on the following criteria:

[0111] Precise control: Precise control is required for the speed and pressure of blood aspiration and delivery;

[0112] Stability and reliability: The motor must be stable and reliable, and able to operate for extended periods of time;

[0113] Cleanliness and safety: Medical devices must meet stringent hygiene standards, and motors should have good sealing properties to prevent contamination;

[0114] Noise and vibration: Low noise and low vibration to reduce disturbance and discomfort to patients;

[0115] Power and speed: The motor needs to have enough power to generate the required negative and positive pressure while maintaining an appropriate speed.

[0116] Additionally, in this embodiment, as Figure 1 As shown, a first variable diameter pipe section 17 is provided on the device's liquid inlet pipe 1, located between the filter assembly 3 and the drive mechanism; the first variable diameter pipe section 17 is a necked structure extending towards the liquid outlet 2 of the device's liquid inlet pipe 1. Through the aforementioned necked structure of the first variable diameter pipe section 17, the blood flow velocity can be effectively increased, helping blood to better enter the device's liquid inlet pipe 1 section where the piston rod 11 is located.

[0117] On the liquid outlet pipe 5 of the device, near the blood supply end 18 where the liquid outlet pipe 5 connects to the blood vessels of the organism, a second variable diameter pipe section 19 is provided; the second variable diameter pipe section 19 is a neck-expanding structure facing the blood supply end 18. Through the aforementioned neck-expanding structure of the second variable diameter pipe section 19, the blood flow velocity can be effectively reduced, helping blood to flow steadily and slowly into the organism.

[0118] The method of using a thrombus filtration device includes the following steps:

[0119] Step S1: Vacuuming is performed on the inlet pipe 1 and outlet pipe 5 of the device to prevent air from entering the patient's body. In step S1, the vacuuming operation is achieved by injecting saline solution into the inlet pipe 1 and outlet pipe 5 of the device.

[0120] In step S2, during the blood filtration process, the drive mechanism generates negative pressure in the inlet pipe 1 of the device to drive the blood to flow through the opened valve 4 and into the filter assembly 3 to filter blood clots.

[0121] During blood delivery, the drive mechanism generates positive pressure in the inlet pipe 1 of the device, the valve 4 closes, and the blood enters the outlet pipe 5 of the device from the inlet pipe 1 and returns to the body.

[0122] Of course, in this embodiment, the specific structure of valve 4 is not specifically limited. In other embodiments, valve 4 can also be a one-way valve with other structures. Valve 4 allows blood to flow from the device inlet line 1 into the thrombus filtration device. However, when blood flows in the reverse direction from the device inlet line 1 toward the human body, valve 4 is actuated to close.

[0123] Of course, in this embodiment, the specific structure of the filter component 3 is not specifically limited. In other embodiments, the filter component 3 simply includes the filter screen 7 and the recycling bag 8. The pore size of the filter screen 7 is smaller than the diameter of the blood clot to filter the blood clot from the blood.

[0124] Of course, in this embodiment, there is no specific limitation on whether the piston pushing end 12 is a regular semi-circular structure. In other embodiments, the piston pushing end 12 is a semi-elliptical structure facing the liquid inlet 6.

[0125] Of course, in this embodiment, the connection method between the device inlet pipe 1 and the device outlet pipe 5 and the blood vessels of the organism is not specifically limited. In other embodiments, the device inlet pipe 1 and the device outlet pipe 5 can also be connected to the blood vessels and fixedly connected in other ways.

[0126] Of course, in this embodiment, the method of performing vacuuming operation on the equipment inlet pipe 1 and the equipment outlet pipe 5 is not specifically limited. In other embodiments, in the above step S1, the equipment inlet pipe 1 and the equipment outlet pipe 5 can also be vacuumed by a vacuum pump.

[0127] Example 2

[0128] A thrombus filtering device is described, comprising:

[0129] The device has an inlet pipe 1 connected to a blood vessel for introducing blood into the thrombus filtration device. A valve 4 is also provided at the inlet 6 of the inlet pipe 1 to prevent backflow of thrombi. The valve 4 is a one-way valve body formed by assembling multiple plates, which are positioned towards the outlet 2 of the inlet pipe 1. When blood flows into the thrombus filtration device from the inlet pipe 1, the valve 4 opens; when blood flows backward from the inlet pipe 1 towards the human body, the valve 4 closes.

[0130] A filter assembly 3 is disposed on the flow path of the inlet pipe 1 of the device for filtering blood entering the thrombus filtration device; the filter assembly 3 includes: a filter screen 7, the pore size of which is smaller than the diameter of the thrombus to filter thrombi in the blood; a filter element 9, disposed on the side of the filter screen 7 facing the outlet 2 of the inlet pipe 1 of the device for filtering microbubbles and microthrombi in the blood; and a recovery bag 8, disposed between the filter screen 7 and the valve 4 for containing the filtered thrombi; the recovery bag 8 is detachably installed on the inlet pipe 1 of the device.

[0131] The device's outlet pipe 5 is connected at one end to the blood vessels of the organism and at the other end to the outlet 2 of the device's inlet pipe 1, and is used to return the filtered blood to the organism; the device's outlet pipe 5 is a flexible tube to facilitate blood flow.

[0132] The driving mechanism is connected to the inlet pipe 1 of the device. During the blood filtration process, the driving mechanism generates negative pressure in the inlet pipe 1 of the device to drive the blood to flow through the open valve 4 and enter the filter assembly 3 to filter blood clots. During the blood transport process, the driving mechanism generates positive pressure in the inlet pipe 1 of the device, the valve 4 closes, and the blood enters the outlet pipe 5 of the device from the inlet pipe 1 and returns to the body.

[0133] In this embodiment, as Figure 7 The diagram shows the mating structure of the piston rod and the equipment's liquid inlet pipe. The piston pushing end 12 is a plate-like structure located at the end of the piston rod 11, and the outer contour edge of the plate-like structure abuts against the inner wall of the equipment's liquid inlet pipe 1. The piston rod 11 is composed of two connecting rods 14; the plate-like structure consists of two pieces, and the central position of the plate-like structure is connected to the corresponding connecting rod 14.

[0134] Of course, in this embodiment, the number of plate-like structures at the end of the piston rod 11 and the connecting rod 14 of the piston rod 11 are not specifically limited. In other embodiments, the piston pushing end 12 is a plate-like structure disposed at the end of the piston rod 11, and the outer contour edge of the plate-like structure abuts against the inner wall of the liquid inlet pipe 1 of the device. The piston rod 11 is composed of one or more connecting rods 14; the plate-like structure consists of two or more pieces, and the central position of the plate-like structure is connected to the corresponding connecting rod 14.

[0135] Example 3

[0136] A thrombus filtering device is described, comprising:

[0137] The device has an inlet pipe 1 connected to a blood vessel for introducing blood into the thrombus filtration device. A valve 4 is also provided at the inlet 6 of the inlet pipe 1 to prevent backflow of thrombi. The valve 4 is a one-way valve body formed by assembling multiple plates, which are positioned towards the outlet 2 of the inlet pipe 1. When blood flows into the thrombus filtration device from the inlet pipe 1, the valve 4 opens; when blood flows backward from the inlet pipe 1 towards the human body, the valve 4 closes.

[0138] A filter assembly 3 is disposed on the flow path of the inlet pipe 1 of the device for filtering blood entering the thrombus filtration device; the filter assembly 3 includes: a filter screen 7, the pore size of which is smaller than the diameter of the thrombus to filter thrombi in the blood; a filter element 9, disposed on the side of the filter screen 7 facing the outlet 2 of the inlet pipe 1 of the device for filtering microbubbles and microthrombi in the blood; and a recovery bag 8, disposed between the filter screen 7 and the valve 4 for containing the filtered thrombi; the recovery bag 8 is detachably installed on the inlet pipe 1 of the device.

[0139] The device's outlet pipe 5 is connected at one end to the blood vessels of the organism and at the other end to the outlet 2 of the device's inlet pipe 1, and is used to return the filtered blood to the organism; the device's outlet pipe 5 is a flexible tube to facilitate blood flow.

[0140] The drive mechanism is connected to the inlet pipe 1 of the device. During the blood filtration process, the drive mechanism generates negative pressure in the inlet pipe 1 of the device to drive the blood to flow through the open valve 4 and enter the filter assembly 3 to filter blood clots. During the blood transport process, the drive mechanism transports the blood from the inlet pipe 1 of the device to the outlet pipe 5 of the device and finally returns it to the body.

[0141] In this embodiment, as Figure 8 and Figure 9 As shown, Figure 8 This is a schematic diagram of the fit between the worm gear and the equipment's liquid inlet pipeline. Figure 9 This is the front view of the worm gear in this embodiment.

[0142] The drive mechanism includes:

[0143] The worm gear 15 is driven to rotate circumferentially within the liquid inlet pipe 1 of the device. The worm gear 15 transports blood from the liquid inlet pipe 1 to the liquid outlet pipe 5 of the device and finally returns it to the body. The blood enters the pipe section where the worm gear 15 is located through the gap between the adjacent rotating teeth 16 of the worm gear 15.

[0144] A drive unit is connected to the worm gear 15 to drive the worm gear 15 to rotate. During the blood filtration process, the worm gear 15 is driven to rotate continuously in one direction, storing blood in the gap between adjacent teeth of the worm gear 15. The pressure in the device inlet pipe 1 between the worm gear 15 and the valve 4 decreases, and the valve 4 opens to allow blood to pass through the filter assembly 3.

[0145] During the blood transport process, the worm gear 15 is driven to rotate circumferentially within the equipment's inlet pipe 1. Blood enters the pipe section containing the worm gear 15 through the gaps between adjacent rotating teeth 16. The worm gear 15 transports the blood from the equipment's inlet pipe 1 to the equipment's outlet pipe 5 and ultimately back into the body. Specifically, during this blood transport process, the worm gear 15 rotates in a single direction, forming a continuous, spiral fluid channel between the worm gear teeth and the inner wall of the inlet pipe 1. That is, the equipment's inlet pipe 1 and the equipment's outlet pipe 5 are connected through this channel. During the rotation of the worm gear, the spiral teeth exert a thrust on the blood within the spiral channel, propelling the blood continuously from the equipment's inlet pipe 1 into the equipment's outlet pipe 5, thus completing the filtration of the blood and its return to the body.

[0146] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A thrombus filtering device, characterized by, The device comprises: a device inlet pipe (1) in communication with a blood vessel for introducing blood into a thrombus filter device; a valve (4) is arranged at the position of the inlet opening (6) of the device inlet pipe (1) to prevent the backflow of thrombus; a filter assembly (3) arranged in the flow path of the device inlet pipe (1) for filtering the blood entering the thrombus filter device; a device outlet pipe (5) in communication with the blood vessel of the living body at one end and in communication with the outlet opening (2) of the device inlet pipe (1) at the other end for returning the filtered blood to the living body; a driving mechanism in communication with the device inlet pipe (1); during the blood filtering process, the driving mechanism generates negative pressure in the device inlet pipe (1) to drive the blood to flow through the opened valve (4) and enter the filter assembly (3) to filter thrombus; during the blood delivery process, the driving mechanism delivers the blood from the device inlet pipe (1) to the device outlet pipe (5) and finally returns to the living body.

2. The thrombus filter device of claim 1, wherein, The valve (4) is a one-way valve body formed by a plurality of pieces arranged towards the outlet opening (2) of the device inlet pipe (1); When the blood is driven to flow from the device inlet pipe (1) into the thrombus filter device, the valve (4) is driven to open; when the blood flows reversely from the device inlet pipe (1) towards the human body, the valve (4) is driven to close.

3. The thrombus filter device of claim 1, wherein, The filter assembly (3) comprises: a filter screen (7) with a pore size smaller than the diameter of the thrombus to filter the thrombus in the blood; a recovery bag (8) arranged between the filter screen (7) and the valve (4) for accommodating the filtered thrombus; the recovery bag (8) is detachably mounted on the device inlet pipe (1).

4. The thrombus filter device of claim 3, wherein, The filter assembly (3) further comprises: a filter core (9) arranged on the side of the filter screen (7) towards the outlet opening (2) of the device inlet pipe (1) for filtering micro-bubbles and micro-thrombus in the blood.

5. The thrombus filter device of claim 1, wherein, The device inlet pipe (1) is in communication with the blood vessel of the living body and is fixed by an elastic fastener (10); and / or, the device outlet pipe (5) is in communication with the blood vessel of the living body and is fixed by an elastic fastener (10); The elastic fastener (10) is an elastic sleeve fitted at the connection position of the device inlet pipe (1) and the blood vessel of the living body, or at the connection position of the device outlet pipe (5) and the blood vessel of the living body.

6. The thrombus filter device of any of claims 1 to 5, wherein, The driving mechanism comprises: a piston rod (11) slidingly arranged in the device inlet pipe (1), and the piston rod (11) has a piston pushing end (12) of flexible material towards the inlet opening (6) of the device inlet pipe (1). The driving part (13) is connected with the piston rod (11) in transmission to drive the piston rod (11) to reciprocate in the device inlet pipeline (1); during the blood filtering process, the piston rod (11) moves towards the direction away from the inlet (6), the pressure in the device inlet pipeline (1) between the piston pushing end (12) and the valve (4) is reduced, the valve (4) is opened to make the blood pass through the filtering assembly (3); during the blood delivery process, the piston rod (11) moves towards the direction close to the inlet (6), the pressure in the device inlet pipeline (1) between the piston pushing end (12) and the valve (4) is increased, the valve (4) is closed to make the piston pushing end (12) deform and form a gap between the piston pushing end (12) and the device inlet pipeline (1), the blood passes through the gap to enter the device outlet pipeline (5) and return to the organism.

7. The thrombus filter device of claim 6, wherein, The piston pushing end (12) is a one-way valve, a semicircular structure or a semi-elliptical structure arranged towards the inlet (6).

8. The thrombus filter device of claim 6, wherein, The piston pushing end (12) is a sheet structure arranged at the end of the piston rod (11), the sheet structure is a one-way valve, the outer contour edge of the sheet structure abuts against the inner cavity wall of the device inlet pipeline (1); the sheet structure extends towards the center line direction of the device inlet pipeline (1) in the direction of the valve (4), in the opened state, the sheet structure deforms and forms a gap between the inner cavity wall of the device inlet pipeline (1) for the blood to flow.

9. The thrombus filter device of claim 8, wherein, The piston rod (11) is composed of two connecting rods (14); the sheet structure is two sheets, and the central position of the sheet structure is connected with the connecting rod (14) corresponding thereto.

10. The thrombus filter device of any of claims 1-5, wherein, The driving mechanism comprises: The worm (15) is arranged in the device inlet pipeline (1) in transmission along the circumference and rotates; the blood enters the pipe section where the worm (15) is arranged through the gap between the adjacent rotating teeth (16) of the worm (15), the worm (15) delivers the blood from the device inlet pipeline (1) to the device outlet pipeline (5) and finally returns to the organism; The driving part is connected with the worm (15) in transmission to drive the worm (15) to rotate.

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