Medical suction device

Abstract

The medical suction device comprises an interventional catheter, a filtering mechanism and a suction mechanism, the interventional catheter comprises a catheter wall extending in the axial direction of the interventional catheter and a first passage defined by the catheter wall, and at least one one-way conduction piece enabling the first passage to be in one-way conduction from the far end of the first passage to the near end of the first passage is arranged in the first passage; a first through hole for communicating the inside and the outside of the first passage is formed in the catheter wall, and is positioned at the near end of the intervention catheter relative to the one-way conducting piece; the filtering mechanism comprises a balloon and a blocking piece, the balloon wraps the catheter wall in a surrounding mode, a containing cavity is formed between the balloon and the catheter wall, the first through hole communicates with the containing cavity and the first channel, a second through hole communicating the interior and the exterior of the containing cavity is formed in the balloon, and the blocking piece is located in the containing cavity and located outside the catheter wall; the suction mechanism is connected with the near end of the intervention catheter and has a suction state and a discharge state.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and in particular to a medical suction device. Background Art

[0002] Vascular disease has become the leading cause of death in my country, and vascular embolism has become a major factor in vascular disease. Thrombi are small pieces of blood that form on the surface of the peeling or repaired parts of the cardiovascular system's blood vessels.

[0003] Related thrombus aspiration systems usually use negative pressure to directly aspirate the thrombus at the lesion site. However, when used, the negative pressure aspirates not only the thrombus but also the normal blood, resulting in a large amount of blood loss for the patient. Utility Model Content

[0004] The embodiments of the present application provide a medical suction device that can reduce blood loss.

[0005] The embodiment of the present application provides a medical suction device, including an interventional catheter, a filtering mechanism and a suction mechanism. The interventional catheter includes a catheter wall extending along its axial direction and a first passage formed by the catheter wall. The first passage is provided with at least one one-way conducting member that allows the first passage to be unidirectionally conducted from its distal end to its proximal end. The catheter wall is provided with a first through hole connecting the inside and outside of the first passage. The first through hole is located at the proximal end of the interventional catheter relative to the one-way conducting member; the filtering mechanism includes a balloon and a barrier member. The balloon surrounds and covers the outside of the catheter wall. A receiving cavity is formed between the balloon and the catheter wall. The first through hole connects the receiving cavity and the first passage. The balloon is provided with a connecting A second through hole connecting the inside and outside of the accommodating cavity, the barrier is located in the accommodating cavity and outside the catheter wall; the suction mechanism is connected to the proximal end of the interventional catheter, and the suction mechanism has an extraction state and a discharge state. In the extraction state, the suction mechanism provides negative pressure to the first passage, so that blood and thrombus pass through the first passage and move from the distal end to the proximal end; in the discharge state, the suction mechanism provides positive pressure to the first passage, so that the liquid located at the proximal end of the unidirectional conductive member in the first passage enters the accommodating cavity through the first through hole and finally flows out through the second through hole, so that the thrombus located at the proximal end of the unidirectional conductive member in the first passage enters the accommodating cavity through the first through hole and is collected by the barrier.

[0006] According to an embodiment of the first aspect of the present application, the balloon includes a first part and a second part that are interconnected, the first part is located at the proximal end of the second part and the first part and the second part are both surrounded and covered by the catheter wall, the accommodating cavity includes a first cavity located between the first part and the catheter wall and a second cavity located between the second part and the catheter wall, the first through hole connects the first passage and the first part, and the second through hole is located on the second part; when the suction mechanism is in a discharge state, the liquid in the proximal end of the unidirectional conductive member in the first passage flows through the first passage, the first through hole, the first cavity, the second cavity, and the second through hole in sequence and flows out, and the thrombus in the proximal end of the unidirectional conductive member in the first passage flows through the first passage, the first through hole, the first cavity in sequence and then enters the second cavity and is collected in the second cavity by the barrier member.

[0007] According to the implementation scheme of the first aspect of the present application, the barrier is an annular barrier arranged around the catheter wall, and the barrier includes a first end connected to the catheter wall and a second end extending radially outward; when the suction mechanism is in an extraction state, the balloon is contracted toward the side of the catheter wall until the balloon abuts the second end, and the first cavity and the second cavity are separated by the barrier; when the suction mechanism is in a discharge state, the suction mechanism provides positive pressure to the first passage, causing the balloon to expand radially outward until the balloon is separated from the second end, and the first cavity and the second cavity are connected through the gap between the balloon and the second end.

[0008] According to an embodiment of the first aspect of the present application, in a direction from the first end to the second end, the barrier is inclined toward the distal end of the interventional catheter.

[0009] According to an embodiment of the first aspect of the present application, the second end is separated from the balloon, and when the suction mechanism is in the discharge state, the gap between the second end and the balloon is larger than the diameter of the thrombus.

[0010] According to an embodiment of the first aspect of the present application, the barrier is a one-way conducting member that is arranged around the catheter wall and allows one-way conduction from the first cavity to the second cavity.

[0011] According to an embodiment of the first aspect of the present application, the barrier comprises a first end connected to the catheter wall and a second end extending radially outward, wherein the second end is sealingly connected to the balloon.

[0012] According to the implementation of the first aspect of the present application, it also includes: a first pipeline connecting the suction mechanism and the proximal end of the first passage, and a first valve for opening and closing the first pipeline is provided on the first pipeline.

[0013] According to an implementation of the first aspect of the present application, the first valve is a three-way valve; the medical suction device also includes a sampling pipeline connected to the first valve.

[0014] According to the implementation of the first aspect of the present application, the area of ​​the first through hole is greater than or equal to 3 square millimeters, and the area of ​​the first through hole is less than or equal to 10 square millimeters; and / or the area of ​​the second through hole is less than 3 square millimeters.

[0015] The medical suction device of the embodiment of the present application includes an interventional catheter, a filtering mechanism and a suction mechanism. The interventional catheter includes a catheter wall extending along its axial direction and a first passage formed by the catheter wall. The first passage is provided with at least one one-way conducting member that allows the first passage to be unidirectionally conducted from its distal end to its proximal end. The catheter wall is provided with a first through hole connecting the inside and outside of the first passage. The first through hole is located at the proximal end of the interventional catheter relative to the one-way conducting member; the filtering mechanism includes a balloon and a barrier member. The balloon surrounds and covers the outside of the catheter wall. A receiving cavity is formed between the balloon and the catheter wall. The first through hole connects the receiving cavity and the first passage. The balloon is provided with a connecting container. The second through hole inside and outside the cavity, the barrier is located in the accommodating cavity and outside the catheter wall; the suction mechanism is connected to the proximal end of the interventional catheter, and the suction mechanism has an extraction state and a discharge state. In the extraction state, the suction mechanism provides negative pressure to the first pathway, so that blood and thrombus pass through the first pathway and move from the distal end to the proximal end; in the discharge state, the suction mechanism provides positive pressure to the first pathway, so that the liquid located at the proximal end of the unidirectional conductive member in the first pathway enters the accommodating cavity through the first through hole and finally flows out through the second through hole, so that the thrombus located at the proximal end of the unidirectional conductive member in the first pathway enters the accommodating cavity through the first through hole and is collected by the barrier.

[0016] The present application provides a suction mechanism with extraction and discharge states. In the extraction state, thrombus removal is achieved by suctioning the affected area through the distal end of the first pathway. In the discharge state, the extracted thrombus and blood are pushed back from the proximal end of the first pathway to the distal end of the first pathway. Furthermore, by providing a filtering mechanism, a one-way conducting member located within the first pathway, and a first through-hole at the proximal end of the one-way conducting member connecting the first pathway with a receiving chamber, in the discharge state, thrombus and blood enter the receiving chamber through the first through-hole. The thrombus is collected by the barrier, and the blood that has been filtered out of the thrombus flows back into the patient's blood vessels through the second through-hole on the balloon, thereby clearing the thrombus and reducing the patient's blood loss. By locating the filtering mechanism outside the catheter wall, thrombus is collected outside the first pathway. During repeated suction cycles by the medical suction device, thrombus is less likely to clog the first pathway and the suction mechanism, thereby improving the thrombus removal efficiency of the medical suction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1This is a schematic structural diagram of a medical suction device according to some embodiments of the present application;

[0019] Figure 2 A schematic structural diagram showing an exemplary interventional catheter and filtering mechanism;

[0020] Figure 3 A schematic structural diagram of an exemplary interventional catheter is shown;

[0021] Figure 4 A schematic diagram showing the structure of an exemplary interventional catheter and a filtering mechanism in an extraction state;

[0022] Figure 5 A schematic structural diagram of an exemplary interventional catheter and a filtering mechanism in a discharge state is shown.

[0023] Reference numerals:

[0024] 10. Medical suction device; 20. Thrombosis;

[0025] 100, interventional catheter; 110, catheter wall; 111, first through hole; 120, first passage; 121, one-way guide member;

[0026] 200, filter mechanism; 210, balloon; 211, accommodating chamber; 212, second through hole; 213, first portion; 214, second portion; 215, first cavity; 216, second cavity; 220, barrier; 221, first end; 222, second end;

[0027] 300, suction mechanism;

[0028] 400, first pipeline; 410, first valve;

[0029] 500, tee pipe;

[0030] x, first direction. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0033] The following describes the medical suction device provided in accordance with an embodiment of the present application, with reference to the accompanying drawings. In the accompanying drawings, the direction extending along the line connecting the proximal and distal ends of the interventional catheter and pointing from the distal end to the proximal end is referred to as the first direction, designated as x. For ease of illustration, the dimensions in the drawings are not necessarily proportional to actual dimensions.

[0034] Please refer to Figures 1 to 3 , Figure 1 This is a schematic structural diagram of a medical suction device according to some embodiments of the present application; Figure 2 A schematic structural diagram showing an exemplary interventional catheter and filtering mechanism; Figure 3 A schematic structural diagram of an exemplary interventional catheter is shown.

[0035] Combine Figures 1 to 3As can be seen, to address the technical issues mentioned in the background art, the applicant proposes a medical suction device 10, which includes an interventional catheter 100, a filtering mechanism 200, and a suction mechanism 300. The interventional catheter 100 includes a catheter wall 110 extending along its axial direction (a first direction x in the figure) and a first passage 120 enclosed by the catheter wall 110. The first passage 120 is provided with at least one one-way conducting member 121 that allows the first passage 120 to conduct one-way from its distal end to its proximal end. A first through hole 111 is provided in the catheter wall 110, connecting the inside and outside of the first passage 120. The first through hole 111 is located at the proximal end of the interventional catheter 100 relative to the one-way conducting member 121. The filtering mechanism 200 includes a balloon 210 and a barrier 220. The balloon 210 surrounds and covers the exterior of the catheter wall 110, forming a receiving chamber 211 between the balloon 210 and the catheter wall 110. A first through-hole 111 connects the receiving chamber 211 with the first passage 120. The balloon 210 is provided with a second through-hole 212 that connects the interior and exterior of the receiving chamber 211. The barrier 220 is located within the receiving chamber 211 and outside the catheter wall 110. The suction mechanism 300 is connected to the proximal end of the interventional catheter 100 and has an extraction state and a discharge state. In the extraction state, the suction mechanism 300 applies negative pressure to the first passage 120, causing blood and thrombus to pass through the first passage 120 and move from the distal end to the proximal end. In the discharge state, the suction mechanism 300 provides positive pressure to the first passage 120, so that the liquid located at the proximal end of the one-way conductor 121 in the first passage 120 enters the accommodating chamber 211 through the first through hole 111 and finally flows out through the second through hole 212, so that the thrombus located at the proximal end of the one-way conductor 121 in the first passage 120 enters the accommodating chamber 211 through the first through hole 111 and is collected by the blocking member 220.

[0036] The interventional catheter 100 has openings at both ends along its axial direction. The axial direction of the interventional catheter 100 can be understood as the direction in which the interventional catheter 100 is inserted into the patient's blood vessel. For ease of illustration and description, the x-direction in the figure is a straight line. However, in practice, the interventional catheter 100 has a certain degree of bending performance to facilitate insertion into a blood vessel. Therefore, in actual applications, the central axis of the interventional catheter 100 can also extend in a curved direction.

[0037] It will be understood that, in this application, the proximal end refers to the end facing the operator or physician, and the distal end refers to the end facing away from the operator or physician. When the interventional catheter 100 is inserted into a patient's blood vessel, its proximal end is located within the vessel, while the distal end is located outside the patient's body and communicates with the suction mechanism 300. When the proximal end of the interventional catheter 100 is inserted into a patient's blood vessel, the proximal opening connects the first passage 120 to the patient's blood vessel, and the second through hole 212 connects the accommodating chamber 211 to the patient's blood vessel.

[0038] It should be noted that the interventional catheter 100 is a cylindrical structure and therefore has two circumferential surfaces. The circumferential surface of the outer wall of the interventional catheter 100 is the outer circumferential surface, and the circumferential surface of the inner wall of the interventional catheter 100 is the inner circumferential surface. The balloon 210 and the barrier 220 are both connected to the outer circumferential surface of the interventional catheter 100. The inner side of the catheter wall 110 refers to the inner circumferential side of the catheter wall 110, and the outer side of the catheter wall 110 refers to the outer circumferential side of the catheter wall 110. The axial direction of the interventional catheter 100 refers to the direction in which its central axis extends, the circumferential direction refers to the circumferential direction of the outer periphery of the cylinder, and the radial direction refers to the direction passing through the central axis in a radial plane, and generally also refers to the linear direction along the diameter or radius, or the linear direction perpendicular to the central axis. It will be understood that in this application, the axial, circumferential, radial, and circumferential surfaces of other components can refer to the relevant description of the interventional catheter 100 mentioned above.

[0039] In some embodiments of the present application, there may be multiple one-way conducting members 121, further improving the one-way flow restriction within the first passage 120 and reducing the risk of functional failure of the entire medical suction device 10 due to damage to a single one-way conducting member 121. The one-way conducting member 121 may be a one-way valve or a one-way membrane.

[0040] The medical suction device 10 provided in the present application is provided with a suction mechanism 300, which has an extraction state and a discharge state. In the extraction state, thrombus in the affected area is aspirated through the distal end of the first passage 120 to achieve the function of thrombus removal. In the discharge state, the aspirated thrombus and blood are pushed back from the proximal end of the first passage 120 to the distal end of the first passage 120. Furthermore, by providing a filtering mechanism 200, a one-way conducting member 121 located within the first passage 120, and a first through hole 111 provided at the proximal end of the one-way conducting member 121, connecting the first passage 120 with the accommodating chamber 211, in the discharge state, thrombus and blood enter the accommodating chamber 211 through the first through hole 111. The thrombus is collected by the barrier 220, and the blood that has been filtered out of the thrombus flows back into the patient's blood vessels through the second through hole 212 of the balloon 210, thereby clearing the thrombus and reducing the patient's blood loss. By locating the filtering mechanism 200 on the outside of the catheter wall 110, thrombi are collected outside the first passage 120. During the multiple reciprocating suction processes of the medical suction device 10, thrombi are less likely to block the first passage 120 and the suction mechanism 300, thereby improving the thrombus removal efficiency of the medical suction device 10.

[0041] After introducing the overall structure of the medical suction device 10 , the specific implementation of the interventional catheter 100 and the filtering mechanism 200 will be described below with reference to the accompanying drawings.

[0042] In some embodiments of the present application, the area of ​​the first through hole 111 is greater than or equal to 3 square millimeters, and the area of ​​the first through hole 111 is less than or equal to 10 square millimeters.

[0043] In some embodiments of the present application, the area of ​​the second through hole 212 is less than 3 square millimeters.

[0044] In some embodiments of the present application, the area of ​​the first through hole 111 is larger than the area of ​​the thrombus, and the area of ​​the second through hole 212 is smaller than the area of ​​the thrombus.

[0045] In some embodiments of the present application, the orthographic projection shapes of the first through hole 111 and the second through hole 212 may be circular, diamond-shaped, or other shapes.

[0046] In the medical suction device 10 provided herein, by setting the area of ​​the first through hole 111 to 3-10 square millimeters, blood and thrombus can enter the accommodating chamber 211 from the first passage 120 through the first through hole 111. By setting the area of ​​the second through hole 212 to less than 3 square millimeters, blood can flow out of the accommodating chamber 211 through the second through hole 212, while thrombus with an area larger than the second through hole 212 cannot flow out of the second through hole 212.

[0047] Please refer to Figure 4 and Figure 5 , Figure 4 A schematic diagram showing the structure of an exemplary interventional catheter and a filtering mechanism in an extraction state; Figure 5 A schematic structural diagram of an exemplary interventional catheter and a filtering mechanism in a discharge state is shown.

[0048] Combine Figure 4 and Figure 5 As can be seen, in some embodiments of the present application, the balloon 210 includes a first portion 213 and a second portion 214 that are interconnected. The first portion 213 is located proximal to the second portion 214, and both the first portion 213 and the second portion 214 surround and cover the catheter wall 110. The accommodating chamber 211 includes a first cavity 215 located between the first portion 213 and the catheter wall 110, and a second cavity 216 located between the second portion 214 and the catheter wall 110. The first through hole 111 connects the first passage 120 and the first portion 213, and the second through hole 212 is located on the second portion 214. When the suction mechanism 300 is in the discharge state, the liquid in the proximal end of the unidirectional guide 121 in the first passage 120 flows through the first passage 120, the first through hole 111, the first cavity 215, the second cavity 216, and the second through hole 212 in sequence, and then flows out. The thrombus at the proximal end of the unidirectional conductive member 121 in the first passage 120 flows through the first passage 120 , the first through hole 111 , and the first cavity 215 in sequence, and then enters the second cavity 216 and is collected in the second cavity 216 by the blocking member 220 .

[0049] In some embodiments, the barrier 220 is an annular barrier disposed around the catheter wall 110. The barrier 220 includes a first end 221 connected to the catheter wall 110 and a second end 222 extending radially outward. The barrier 220 is inclined toward the distal end of the interventional catheter 100 in a direction from the first end 221 to the second end 222.

[0050] When the suction mechanism 300 is in the extraction state, it applies negative pressure to the first passage 120, causing the balloon 210 to contract toward the catheter wall 110 until the balloon 210 abuts the second end 222, and the first cavity 215 and the second cavity 216 are separated by the barrier 220. Simultaneously, the first portion 213 continues to contract toward the catheter wall 110 under the negative pressure of the first passage 120 until the first portion 213 wraps around the catheter wall 110 and covers the first through hole 111, thereby isolating the first cavity 215 from the first passage 120.

[0051] When the suction mechanism 300 is in the discharge state, it applies positive pressure to the first passage 120, causing the balloon 210 to expand radially outward until the balloon 210 separates from the second end 222. The first cavity 215 and the second cavity 216 are connected through the gap between the balloon 210 and the second end 222. Simultaneously, the blood and thrombus 20 in the first cavity 215 can enter the second cavity 216 through the gap between the balloon 210 and the second end 222, while the blood continues to flow back into the blood vessel through the second through hole 212. The thrombus 20 cannot flow out of the second through hole 212 because its area is larger than the diameter of the second through hole 212.

[0052] In which, the second end 222 is separated from the balloon 210. When the suction mechanism 300 is in the discharge state, the gap between the second end 222 and the balloon 210 is larger than the diameter of the thrombus, so that the thrombus can enter the second cavity 216 from the first cavity 215 through the gap between the balloon 210 and the second end 222.

[0053] In the medical suction device 10 provided in the present application, the barrier 220 is tilted toward the distal end of the interventional catheter 100 in the direction from the first end 221 to the second end 222, so that the second cavity 216 formed between the barrier 220 and the catheter wall 110 is funnel-shaped. When the second cavity 216 is connected to the first cavity 215, the funnel-shaped second cavity 216 can prevent the thrombus 20 from flowing back to the first cavity 215 from the gap between the barrier 220 and the balloon 210, thereby improving the collection effect of the barrier 220 on the thrombus 20.

[0054] In other embodiments of the present application, the barrier 220 is a one-way conducting member disposed around the catheter wall 110 and allowing one-way conduction from the first cavity 215 to the second cavity 216. The barrier 220 includes a first end 221 connected to the catheter wall 110 and a second end 222 extending radially outward. The second end 222 is sealedly connected to the balloon 210. In this embodiment, the barrier 220 may be a one-way valve or a one-way membrane, which can also ensure that thrombus can only enter the second cavity 216 from the first cavity 215 and cannot return from the second cavity 216 to the first cavity 215, thereby achieving the barrier 220's function of collecting thrombus 20.

[0055] After describing the implementation of the interventional catheter 100 and the filtering mechanism 200 in the medical suction device 10 , the implementation of the suction mechanism 300 will be described below with reference to the accompanying drawings.

[0056] In some embodiments of the present application, the suction mechanism 300 is a syringe or a negative pressure pump. During the thrombectomy process, the suction mechanism 300 is located outside the patient's body and is operated by medical staff to provide positive pressure or negative pressure to the first passage 120.

[0057] In this embodiment, the suction mechanism 300 is specifically described as a syringe. The syringe includes a syringe and a piston rod movably connected to the syringe. The syringe encloses a sealed chamber that is connected to the first passage 120. In the extraction state, the piston rod moves along its axial direction, increasing the volume of the sealed chamber and thereby reducing the air pressure within the sealed chamber. When the sealed chamber is connected to the first passage 120, the sealed chamber provides negative pressure to the first passage 120, allowing the first passage 120 to aspirate thrombus 20 and blood through its distal end, and the thrombus 20 and blood flow into the sealed chamber through the first passage 120. In the discharge state, the piston rod moves in the opposite direction, reducing the volume of the sealed chamber and thereby increasing the air pressure within the sealed chamber. When the sealed chamber is connected to the first passage 120, the sealed chamber provides positive pressure to the first passage 120, causing the thrombus 20 and blood in the sealed chamber to flow into the first passage 120.

[0058] After describing the implementation of the suction mechanism 300 , the implementation of other components in the medical suction device 10 will be described below with reference to the accompanying drawings.

[0059] Please continue to refer to Figure 1 In some embodiments of the present application, the medical suction device 10 may further include a first pipeline 400, which connects the suction mechanism 300 and the proximal end of the first passage 120, and is provided with a first valve 410 for opening and closing the first pipeline 400.

[0060] In some embodiments of the present application, before the suction mechanism 300 switches to the extraction state, the first valve 410 is first closed to isolate the suction mechanism 300 from the first passage 120. The suction force of the suction mechanism 300 is then gradually increased until the suction force reaches a maximum, at which point the first valve 410 is opened to connect the suction mechanism 300 to the first passage 120. The suction mechanism 300 then switches to the extraction state to aspirate the thrombus 20. In this embodiment, the first valve 410 can be simply a two-way valve. In this embodiment, by providing the first valve 410, the suction mechanism 300 and the first passage 120 are first isolated during the process of increasing the suction force of the suction mechanism 300, and then the first valve 410 is opened until the suction force of the suction mechanism 300 reaches a maximum, thereby increasing the instantaneous suction force of the suction mechanism 300 on the thrombus 20 and thereby improving the aspiration effect of the medical suction device 10 on the thrombus 20.

[0061] In some embodiments of the present application, the first valve 410 is a three-way valve. The medical suction device 10 also includes a sampling line (not shown) connected to the first valve 410. During use of the medical suction device 10, medical personnel can use the sampling line to sample blood from patients, thereby improving the functionality of the medical suction device 10.

[0062] In some embodiments of the present application, the medical suction device 10 further includes a tee 500 having three interconnected branches. The suction mechanism 300 and the proximal end of the first passage 120 are respectively connected to two branches of the tee 500. The last branch of the tee 500 can be used for functions such as contrast agent injection, interventional guidewire insertion, perfusion fluid flushing, and exhaust.

[0063] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A medical suction device, characterized in that: include: An interventional catheter comprises a catheter wall extending axially thereof and a first passageway enclosed by the catheter wall, wherein at least one one-way conducting member is disposed within the first passageway for conducting the first passageway from its distal end to its proximal end in a one-way manner, and wherein a first through hole is disposed in the catheter wall to connect the inside and outside of the first passageway, the first through hole being located at the proximal end of the interventional catheter relative to the one-way conducting member; The filtering mechanism includes a balloon and a barrier member, wherein the balloon surrounds and covers the outside of the catheter wall, forming a receiving cavity between the balloon and the catheter wall, the first through hole connecting the receiving cavity and the first passage, and the balloon is provided with a second through hole connecting the inside and outside of the receiving cavity, and the barrier member is located in the receiving cavity and outside the catheter wall; A suction mechanism is connected to the proximal end of the interventional catheter. The suction mechanism has an extraction state and a discharge state. In the extraction state, the suction mechanism provides negative pressure to the first passage, so that blood and thrombus pass through the first passage and move from the distal end to the proximal end; in the discharge state, the suction mechanism provides positive pressure to the first passage, so that the liquid located at the proximal end of the one-way conductive member in the first passage enters the accommodating cavity through the first through hole and finally flows out through the second through hole, so that the thrombus located at the proximal end of the one-way conductive member in the first passage enters the accommodating cavity through the first through hole and is collected by the barrier member.

2. The medical suction device according to claim 1, characterized in that The balloon includes a first portion and a second portion connected to each other, the first portion is located at the proximal end of the second portion, and both the first portion and the second portion are surrounded and covered by the catheter wall, the accommodating cavity includes a first cavity located between the first portion and the catheter wall and a second cavity located between the second portion and the catheter wall, the first through hole connects the first passage and the first portion, and the second through hole is located on the second portion; When the suction mechanism is in the discharge state, the liquid at the proximal end of the one-way conductor in the first passage flows through the first passage, the first through hole, the first cavity, the second cavity and the second through hole in sequence and flows out, and the thrombus at the proximal end of the one-way conductor in the first passage flows through the first passage, the first through hole, the first cavity in sequence and then enters the second cavity and is collected in the second cavity by the blocking member.

3. The medical suction device according to claim 2, characterized in that The barrier is an annular barrier disposed around the conduit wall, and includes a first end connected to the conduit wall and a second end extending radially outward; When the suction mechanism is in an extraction state, the balloon is contracted toward the side of the catheter wall until the balloon abuts against the second end, and the first cavity and the second cavity are separated by the barrier; When the suction mechanism is in the discharge state, the suction mechanism provides positive pressure to the first passage, causing the balloon to expand radially outward until the balloon is separated from the second end, and the first cavity and the second cavity are connected through the gap between the balloon and the second end.

4. The medical suction device according to claim 3, characterized in that In a direction from the first end to the second end, the barrier is inclined toward the distal end of the interventional catheter.

5. The medical suction device according to claim 3, characterized in that The second end is separated from the balloon, and when the suction mechanism is in a discharge state, the gap between the second end and the balloon is larger than the diameter of the thrombus.

6. The medical suction device according to claim 2, characterized in that The blocking member is a one-way conducting member that is disposed around the conduit wall and enables one-way conduction from the first cavity to the second cavity.

7. The medical suction device according to claim 6, characterized in that The barrier comprises a first end connected to the catheter wall and a second end extending radially outward, wherein the second end is sealingly connected to the balloon.

8. The medical suction device according to claim 1, wherein: Also includes: The first pipeline is connected with the suction mechanism and the proximal end of the first passage. The first pipeline is provided with a first valve for opening and closing the first pipeline.

9. The medical suction device according to claim 8, characterized in that The first valve is a three-way valve; The medical suction device further includes a sampling line in communication with the first valve.

10. The medical suction device according to claim 1, wherein: The area of ​​the first through hole is greater than or equal to 3 square millimeters, and the area of ​​the first through hole is less than or equal to 10 square millimeters; And / or, the area of ​​the second through hole is less than 3 square millimeters.

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