Cancer thrombus filtering components and cancer thrombus auxiliary removal devices

Abstract

The present application provides a cancer thrombus filtering component and a cancer thrombus auxiliary removal device. The cancer thrombus filtering component uses a three-layer sleeve design of an outer sheath, a first sliding member, and a second sliding member to improve its positioning effect in a blood vessel. Furthermore, by moving the first sliding member relative to the outer sheath and the second sliding member, the deployment state of the filter can be accurately adjusted to improve the filtering effect of cancer thrombi in blood vessels. Furthermore, the cancer thrombus auxiliary removal device provided by the present application is designed based on the cancer thrombus filtering component, and is used to filter the cancer thrombi in the blood vessels while providing blood flow blocking in the blood vessels in an intravascular blocking manner, thereby improving the safety of surgical operations.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of medical technology equipment, and in particular to a cancer thrombus filtering component and a cancer thrombus auxiliary removal device. Background Art

[0002] According to statistics, kidney cancer accounts for 2%-3% of adult malignant tumors, and the mortality rate exceeds 40%. A prominent feature of kidney cancer is that it easily spreads into the lumen of the blood vessels of the renal vein system, forming venous cancer thrombi. Among all kidney cancer patients, 4%-10% of cases have cancer thrombi extending to the renal vein or even the inferior vena cava, and may migrate to the proximal end and even to the right atrium.

[0003] According to the statistical results of various centers, 50%-70% of renal cancer patients with inferior vena cava tumor thrombus can achieve a better prognosis through radical nephrectomy and inferior vena cava tumor thrombus removal.

[0004] The existing cancer thrombus filter is placed between the hepatic vein and the renal vein through the jugular vein before surgery. The placement position is low, and the existing cancer thrombus filter structure is only used for intraoperative filtration. However, the filter mesh aperture is too large, and the filter is not easy to remove during surgery. Clinicians have to abandon the placement of the filter. Once the cancer thrombus falls off without protection, the risk of lung metastasis and sudden death is high. In addition, the existing filter structure makes it difficult to block the blood flow in the inferior vena cava during surgery, and the blockage (using a blocking clamp or rubber tube) is incomplete or the filter punctures the inferior vena cava, causing heavy bleeding. Under pneumoperitoneum conditions, a large amount of gas may enter the lungs through the blood circulation, and the consequences are disastrous. For Mayo grade 3 cancer thrombus cases, the combined blockage of the first hepatic portal and the inferior vena cava seriously damages liver function.

[0005] In addition, the dangers of using external blockage are that as the intravascular pressure increases during the operation, it is easy to make mistakes during the operation, and the blockage is often incomplete, so the blocking clip needs to be re-placed, which is time-consuming and laborious.

[0006] In view of this, how to provide a surgical instrument for assisting in removing cancer thrombi in blood vessels to overcome the various problems existing in the prior art is the technical problem to be solved by the present application. Summary of the invention

[0007] In view of the above problems, the main purpose of the present application is to provide a cancer thrombus filtering component, a cancer thrombus auxiliary removal device and an operation method thereof, which can filter cancer thrombi in blood vessels and improve the positioning effect of the filter in the blood vessels, thereby improving the success rate of surgery.

[0008] Another object of the present application is to provide a cancer thrombus filtering component, a cancer thrombus auxiliary removal device and an operation method thereof, which can adjust the setting position of the filter element in the blood vessel and accurately control the deployment state of the filter element in the blood vessel to improve the filtering effect of the cancer thrombus.

[0009] Another object of the present application is to provide a cancer thrombus filtering component, a cancer thrombus auxiliary removal device and an operation method thereof, which uses an internal blocking method to block the blood flow in the blood vessel and can assist in the discharge of residual gas in the blood vessel, thereby improving the safety of the operation.

[0010] To achieve the above-mentioned and other related purposes, the present application provides a cancer thrombus filtering component for filtering cancer thrombus in a blood vessel, comprising: an outer sheath, which is positioned at a preset position in the blood vessel and has an outer sheath cavity axially penetrating the outer sheath and an outer sheath distal end and an outer sheath proximal end located at opposite ends of the outer sheath; and a filtering device, which comprises a first sliding member, which is slidably arranged in the outer sheath cavity and has a filtering cavity axially penetrating the first sliding member and a first sliding member distal end located at one end of the first sliding member; a second sliding member, which is slidably arranged in the filtering cavity and has a second sliding member distal end located at one end of the second sliding member; and a filter member, wherein the second sliding member distal end is connected to the first sliding member distal end at opposite sides of the filter member, and the filter member can be moved according to the first The change in the relative distance between the distal end of the sliding member and the distal end of the second sliding member produces deformation so as to be in a first expanded state or a first contracted state; and wherein the filter element can be stored in the outer sheath cavity in the first contracted state; the filtering device as a whole can move relative to the outer sheath along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filter element in the first contracted state extends from the outer sheath cavity and is exposed; the first sliding member can move relative to the outer sheath and the second sliding member along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that the relative distance between the distal end of the second sliding member and the distal end of the first sliding member is shortened, so that the exposed filter element is switched from the first contracted state to the first expanded state, thereby filtering the cancer thrombus in the blood vessel.

[0011] Optionally, in an embodiment of the present application, the cancer thrombus filtering assembly further includes a developing member, which is disposed or formed at a distal end of the second sliding member and / or a distal end of the first sliding member.

[0012] Optionally, in an embodiment of the present application, the filter element is a filter formed by weaving or laser cutting multiple strands of nickel-titanium alloy wires.

[0013] Optionally, in an embodiment of the present application, the diameter of the filter formed by the filter element in the first expanded state is adjusted by adjusting the relative distance between the distal end of the second sliding element and the distal end of the first sliding element.

[0014] Optionally, in an embodiment of the present application, the filter element may also be covered with an adjustment membrane having pores to adjust the pores of the filter screen.

[0015] Optionally, in an embodiment of the present application, the second sliding member can be acted upon by a first external force to drive the first sliding member to synchronously move relative to the outer sheath along the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filtering device as a whole moves relative to the outer sheath; the first sliding member can be acted upon by a second external force to move bidirectionally relative to the outer sheath and the second sliding member, thereby adjusting the relative distance between the distal end of the second sliding member and the distal end of the first sliding member.

[0016] Optionally, in an embodiment of the present application, the cancer thrombus filtering assembly further includes an operating handle for applying the first external force or the second external force.

[0017] Another embodiment of the present application provides a cancer thrombus auxiliary removal device for assisting in removing cancer thrombus in a blood vessel, comprising: an outer sheath, which is positioned at a preset position in the blood vessel and has an outer sheath cavity axially penetrating the outer sheath, and an outer sheath distal end and an outer sheath proximal end located at opposite ends of the outer sheath; a blocking device, which is slidably disposed in the outer sheath cavity and has a blocking cavity axially penetrating the blocking device, and a blocking member disposed at the distal end of the blocking cavity and switchable between a second contracted state and a second expanded state; and a filtering device, which has: a first sliding member, which slides A filter element is provided in the blocking cavity and has a filter cavity axially penetrating the first sliding element and a first sliding element distal end located at one end of the first sliding element; a second sliding element is slidably provided in the filter cavity and has a second sliding element distal end located at one end of the second sliding element; and a filter element, wherein the second sliding element distal end and the first sliding element distal end are connected to each other at opposite sides of the filter element, respectively, and the filter element can be deformed according to the change of the relative distance between the first sliding element distal end and the second sliding element distal end, so as to be in a first expanded state or a first contracted state. state; and wherein, the blocking member can be stored in the outer sheath cavity in the second contracted state, and the filter can be stored in the blocking cavity in the first contracted state; the filter device as a whole can move relative to the outer sheath and the blocking device along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filter in the first contracted state extends out from the blocking cavity and the outer sheath cavity and is exposed; the first sliding member can move relative to the blocking device and the second sliding member along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that The relative distance between the distal ends of the second sliding member and the first sliding member is shortened, so that the filter element is switched from the first contracted state to the first expanded state, thereby filtering the cancer thrombus in the blood vessel; the blocking device as a whole can move relative to the filtering device and the outer sheath along the proximal end of the outer sheath toward the distal end of the outer sheath, so that the blocking element in the second contracted state is extended from the outer sheath cavity and exposed, and the exposed blocking element can be switched from the second contracted state to the second expanded state, thereby blocking the blood flow in the blood vessel.

[0018] Optionally, in an embodiment of the present application, the blocking device also includes a third sliding member, which is slidably disposed in the outer sheath cavity and has a sliding cavity axially passing through the third sliding member, and a third sliding member distal end located at one end of the third sliding member; a fourth sliding member, which is slidably disposed in the sliding cavity and has the blocking cavity axially passing through the fourth sliding member, and also has a fourth sliding member distal end at one end of the fourth sliding member; wherein the opposite sides of the blocking member are respectively connected to the third sliding member distal end and the first At the distal end of the fourth sliding member, the blocking member can be deformed according to the change of the relative distance between the distal end of the third sliding member and the distal end of the fourth sliding member, so as to be in the second expanded state or the second contracted state; and wherein the third sliding member can move relative to the outer sheath and the fourth sliding member along the proximal end of the outer sheath toward the distal end of the outer sheath, so as to shorten the relative distance between the distal end of the third sliding member and the distal end of the fourth sliding member, and switch the blocking member from the second contracted state to the second expanded state.

[0019] Optionally, in an embodiment of the present application, the blocking member is a braided wire occluder.

[0020] Optionally, in an embodiment of the present application, the second sliding member can be acted upon by a first external force to drive the first sliding member to synchronously move relative to the outer sheath and the blocking device along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filtering device as a whole moves relative to the outer sheath and the blocking device; the first sliding member can be acted upon by a second external force to move bidirectionally relative to the blocking device and the second sliding member, so as to adjust the relative distance between the distal end of the second sliding member and the distal end of the first sliding member; the fourth sliding member can be acted upon by a third external force to drive the third sliding member to synchronously move relative to the filtering device and the outer sheath along the direction of the proximal end of the outer sheath toward the distal end of the outer sheath, so that the blocking device as a whole moves relative to the filtering device and the outer sheath; the third sliding member can be acted upon by a fourth external force to move bidirectionally relative to the outer sheath and the fourth sliding member, so as to adjust the relative distance between the distal end of the third sliding member and the distal end of the fourth sliding member.

[0021] Optionally, in an embodiment of the present application, the cancer thrombus auxiliary removal instrument also includes an operating handle, which has a first operating unit for applying the first external force, a second operating unit for applying the second external force, a third operating unit for applying the third external force, and a fourth operating unit for applying the fourth external force.

[0022] Optionally, in an embodiment of the present application, the operating handle further includes a positioning unit for respectively positioning the first operating unit, the second operating unit, the third operating unit and the fourth operating unit.

[0023] Optionally, in an embodiment of the present application, the positioning unit further has a segmented positioning structure.

[0024] Optionally, in an embodiment of the present application, the filtering device may be partially or completely withdrawn from the blocking cavity via the proximal end of the blocking cavity, so that at least a portion of the blocking cavity forms a cavity.

[0025] Optionally, in an embodiment of the present application, the cancer thrombus auxiliary removal instrument further includes a suction device, which is connected to the blocking cavity to discharge the gas in the blood vessel through the blocking cavity.

[0026] Optionally, in an embodiment of the present application, the cancer thrombus filtering assembly further includes a developing member, which is disposed or formed on at least one of the distal end of the third sliding member, the distal end of the fourth sliding member, the distal end of the second sliding member, and the distal end of the first sliding member.

[0027] The present application also provides an operation method of a cancer thrombus auxiliary removal device, which is applied to the cancer thrombus auxiliary removal device described in the above embodiments, and the operation method includes: positioning the outer sheath at a preset position in the blood vessel, and inserting the filter device into the blocking device through the blocking cavity, and inserting the blocking device into the outer sheath through the outer sheath cavity; allowing the filter element in the first contracted state to extend from the blocking cavity and the outer sheath cavity to be exposed, and allowing the exposed filter element to switch from the first contracted state to the first expanded state, so as to filter the cancer thrombus in the blood vessel; allowing the blocking device in the second contracted state to extend from the blocking cavity and the outer sheath cavity to be exposed, and allowing the exposed filter element to switch from the first contracted state to the first expanded state, so as to filter the cancer thrombus in the blood vessel; allowing the blocking device in the second contracted state to extend from the blocking cavity and the outer sheath cavity to be exposed, and allowing the exposed filter element to switch from the first contracted state to the first expanded state, so as to filter the cancer thrombus in the blood vessel. The component extends from the outer sheath cavity and is exposed, and the exposed blocking component is switched from the second contracted state to the second expanded state to block the blood flow in the blood vessel; after the cancer thrombus in the blood vessel is cleared, the filter component is restored from the first expanded state to the first contracted state, and the filter device is partially or completely withdrawn from the blocking cavity to form a cavity in at least a part of the blocking cavity; the gas in the blood vessel is discharged through the blocking cavity; and the blocking component is restored from the second expanded state to the second contracted state, and the blocking device is withdrawn from the outer sheath cavity as a whole.

[0028] As can be seen from the above technical solutions, the cancer thrombus filtering assembly provided in the embodiment of the present application uses a three-layer sleeve design of an outer sheath, a first sliding member, and a second sliding member, which can increase the positioning effect of the filtering device in the blood vessel. Furthermore, by independently controlling the movement of the first sliding member relative to the outer sheath and the second sliding member, the diameter of the expanded state of the filter can be accurately adjusted to meet the requirements of blood vessels of different diameters and improve the filtering effect of cancer thrombus.

[0029] In addition, the cancer thrombus auxiliary removal device provided in the present application can be used to filter the cancer thrombus in the blood vessel while blocking the blood flow in the blood vessel by intravascular blocking, which can assist in performing the surgical operation of removing the cancer thrombus in the blood vessel and improve the safety of the surgical operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0031] Figures 1A to 1C A schematic diagram showing the structure of a cancer thrombus filtering assembly in different use states according to an embodiment of the present application;

[0032] Figure 2A and Figure 2B It is a cross-sectional schematic diagram showing different embodiments of the filter element of the present application in a first unfolded state;

[0033] FIG. 3A to FIG. 3C Schematic diagrams showing different embodiments of the operating handle of the present application;

[0034] FIG. 4A to FIG. 4C Schematic diagrams showing different embodiments of the cancer thrombus auxiliary removal device of the present application;

[0035] Figure 5A and Figure 5B Schematic diagrams showing different embodiments of the blocking member of the present application in a second unfolded state; and

[0036] FIG. 6A to FIG. 6K A schematic diagram showing the operating steps of the cancer thrombus auxiliary removal device of the present application.

[0037] Component number

[0038] 1: Cancer thrombus filtering assembly; 2: Outer sheath; 20: Outer sheath cavity; 21: Outer sheath distal end; 22: Outer sheath proximal end; 3: Filtering device; 31: First sliding member; 310: Filtering cavity; 311: First sliding member distal end; 32: Second sliding member; 321: Second sliding member distal end; 33: Filtering member; 4: Blocking device; 41: Third sliding member; 410: Sliding cavity; 411: Third sliding member distal end; 42: Fourth sliding member; 420: Blocking cavity; 421: Fourth sliding member distal end; 43: Blocking member; 5: Developing member; 6: Operating handle; 61: First operating unit; 62: Second operating unit; 63: Third operating unit; 64: Fourth operating unit; 65: Positioning unit; 66: Suction port; 7: Cancer thrombus auxiliary removal instrument; 8: Suction device. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0040] In the present application, the so-called “distal end” refers to an end of the operating device that is far away from the operator during actual operation, and the so-called “proximal end” refers to an end of the operating device that is close to the operator during actual operation.

[0041] One embodiment of the present application provides a cancer thrombus filtering assembly, which is mainly used to filter cancer thrombus in blood vessels (for example, the inferior vena cava). Figure 1A and Figure 1C , which is a structural schematic diagram showing the cancer embolus filtering component 1 of the present application in different usage states. As shown in the figure, the cancer embolus filtering component 1 mainly includes an outer sheath 2 and a filtering device 3 slidably arranged in the outer sheath 2, wherein the outer sheath 2 is used to be positioned in a preset position of a blood vessel, and has an outer sheath cavity 20 axially penetrating the outer sheath 2, and an outer sheath distal end 21 and an outer sheath proximal end 22 located at opposite ends of the outer sheath 2.

[0042] The filtering device 3 includes a first sliding member 31, a second sliding member 32, and a filter member 33, wherein the first sliding member 31 is slidably disposed in the outer sheath cavity 20 of the outer sheath 2, and has a filtering cavity 310 axially penetrating the first sliding member 31 and a first sliding member distal end 311 located at one end of the first sliding member 31; the second sliding member 32 is slidably disposed in the filtering cavity 310, and has a second sliding member distal end 321 located at one end of the second sliding member 32; the opposite sides of the filter member 33 are respectively connected to the second sliding member distal end 321 and the first sliding member distal end 311, so that the filter member 33 can be deformed according to the change of the relative distance between the first sliding member distal end 311 and the second sliding member distal end 321, and be in a first expanded state or a first contracted state.

[0043] Specifically, if Figure 1A As shown, the filter element 33 of the filter device 3 can be in a first contracted state and accommodated in the outer sheath cavity 20 of the outer sheath 2. As shown in the figure, in this state, the second sliding member distal end 321 is located at the position of the outer sheath distal end 21, and the first sliding member distal end 311 can be located inside the outer sheath cavity 20. Figure 1BAs shown, the filter device 3 as a whole can move axially relative to the outer sheath 2 along the direction from the outer sheath proximal end 22 to the outer sheath distal end 21, so that the filter element 33 in the first contracted state extends out of the outer sheath cavity 20 through the outer sheath distal end 21 and is exposed to the outside (that is, the first sliding element distal end 311 and the second sliding element distal end 321 both extend out of the outer sheath cavity 20). Figure 1C As shown, the first sliding member 31 can also move axially relative to the outer sheath 2 and the second sliding member 32 along the direction of the outer sheath proximal end 22 toward the outer sheath distal end 21, so that the relative distance between the second sliding member distal end 321 and the first sliding member distal end 311 is shortened, and the exposed filter element 33 is switched from the first contracted state to the first expanded state, so that the filter net formed by the filter element 33 in the first expanded state is used to filter the cancer thrombus in the blood vessel.

[0044] In the present embodiment, the second sliding member 32 slidably disposed in the filter cavity 310 is acted upon by the first external force and drives the first sliding member 31 of its outer layer to synchronously move relative to the outer sheath 2 along the direction from the outer sheath proximal end 22 toward the outer sheath distal end 21, so that the filter device 3 as a whole moves relative to the outer sheath 2. Furthermore, the first sliding member 31 can be acted upon by the second external force to move bidirectionally relative to the outer sheath 2 and the second sliding member 32 (that is, the outer sheath 2 located at the outermost layer and the second sliding member 32 located at the innermost layer both remain in place, and only the first sliding member 31 located at the middle layer moves axially), so as to adjust the relative distance between the distal end 321 of the second sliding member and the distal end 311 of the first sliding member, and further adjust the diameter of the filter screen formed by the filter member 33 in the first expanded state, that is, when the distal end 32 of the second sliding member is moved, the filter device 3 can move relative to the outer sheath 2 and the second sliding member 32. 1 and the first sliding member distal end 311 are relatively long, the diameter of the filter screen formed by the filter element 33 is relatively small, and when the relative distance between the second sliding member distal end 321 and the first sliding member distal end 311 is relatively short, the diameter of the filter screen formed by the filter element 33 is relatively large, so as to be suitable for the use requirements of blood vessels with different diameters. In this embodiment, the diameter of the filter screen formed by the filter element 33 is approximately 15-40 mm, but it is not limited thereto and can be adjusted according to actual use requirements.

[0045] In other embodiments, the cancer thrombus filtering assembly 1 further includes an operating handle 6 (eg, Figure 3A The operating handle 6 can be connected to the outer sheath proximal end 22, the first sliding member 31 and the second sliding member 32 respectively, and is used to control the movement of the first sliding member 31 and the second sliding member 32, for example, applying a first external force to the second sliding member 32 or applying a second external force to the first sliding member 31. In addition, the operating handle 6 can also be used to control the positioning of the first sliding member 31 and the second sliding member 32 in the outer sheath cavity 20 and the filter cavity 310 respectively.

[0046] Please refer to Figure 2A and Figure 2BIn the present application, the filter element 33 is, for example, a filter formed by weaving or laser cutting multiple strands of nickel-titanium alloy wires. However, this is not limiting. Various filters that are made by other manufacturing processes or other materials and can produce deformations can also be applied to the present application. Furthermore, the specific unfolding form of the filter element 33 when in the first unfolding state is not as shown in the accompanying drawings (i.e., Figure 2A and Figure 2B The invention is limited to the cross-sectional view shown in FIG. 1 , and other unfolding forms may also be applicable to the present application. Preferably, when the filter element 33 is in the first unfolding state, the maximum pore size of the filter screen formed by it may be between 1 and 5 mm, but there is no particular limitation, as long as the maximum pore size of the filter screen can block the cancer thrombus in the blood vessel but does not affect the normal venous return. In another embodiment, a layer of adjustment membrane with pores may be coated on the outer layer of the filter element 33 to further adjust the maximum pore size of the filter screen formed when the filter element 33 is in the first unfolding state, thereby improving the filtering effect of the cancer thrombus.

[0047] In another embodiment, the cancer thrombus filtering assembly 1 further includes a developing member 5, which can be disposed or formed on the distal end 321 of the second sliding member and / or the distal end 311 of the first sliding member, that is, on one side or two opposite sides of the filter 33, so as to facilitate clear observation of the location of the filter 33 in the blood vessel and its deployment form. In this embodiment, the developing member 5 is, for example, a developing material or a developing coating, or emits near-infrared fluorescence, visible light, and is developed by X-ray, CT, or a da Vinci robot fluorescence detector.

[0048] The operation process of using the cancer thrombus filtering assembly 1 mainly includes: firstly placing the outer sheath 2 at the level of the upper renal vein through the patient's jugular vein, fixing the outer sheath 2 on the patient's body surface (for example, fixing by suturing or gluing), and then placing the filter device 3 into the patient's body through the outer sheath cavity 20 of the outer sheath 2 until it reaches the vicinity of the cancer thrombus. Next, the operating handle 6 is fixedly connected to the outer sheath proximal end 22 of the outer sheath 2 located outside the patient's body, and the first external force is applied to the second sliding member 32 by the operating handle 6 to push the filter 33 of the filter device 3 out of the outer sheath cavity 20; then the second external force is applied to the first sliding member 31 to push the second sliding member 32 forward relative to the outer sheath 2 and the second sliding member 32, so that the exposed filter 33 gradually switches from the first contracted state to the first expanded state, so that the outer diameter of the filter 33 gradually increases and expands and fits with the inner wall of the blood vessel, thereby achieving the purpose of stably fixing the filter 33 inside the blood vessel and near the cancer thrombus, so as to effectively filter the cancer thrombus in the blood vessel. Thus, the cancer thrombus filtering component 1 of the present application utilizes a three-layer sleeve design of an outer sheath 2, a first sliding member 31, and a second sliding member 32, which can accurately control the fixed position of the filter element 33 in the blood vessel and the specific expansion shape of the filter element 33 in the first expansion state, so as to improve the positioning effect of the filter element 33 in the blood vessel.

[0049] Please continue reading FIG. 4A to FIG. 4C Another embodiment of the present application also provides a cancer thrombus auxiliary removal device 7, which is designed based on the above-mentioned cancer thrombus filtering component 1 and is used to filter the cancer thrombus in the blood vessel and block the blood flow in the blood vessel (i.e. Figure 4B and Figure 4C As shown in the figure), this can help remove cancer thrombi in blood vessels.

[0050] As shown in the figure, the cancer thrombus auxiliary removal device 7 mainly includes an outer sheath 2, a blocking device 4 slidably disposed in the outer sheath 2, and a filtering device 3 slidably disposed in the blocking device 4.

[0051] The outer sheath 2 is used to be positioned at a preset position in a blood vessel, and has an outer sheath lumen 20 axially penetrating the outer sheath 2 , and an outer sheath distal end 21 and an outer sheath proximal end 22 located at opposite ends of the outer sheath 2 .

[0052] The blocking device 4 is slidably disposed in the outer sheath cavity 20 of the outer sheath 2 and has a blocking cavity 420 axially penetrating the blocking device 4 , and a blocking member 43 disposed at the distal end of the blocking cavity 420 and switchable between a second contracted state and a second expanded state.

[0053] The main structure of the filtering device 3 is basically similar to the filtering device 3 in the above-mentioned cancer thrombus filtering assembly 1, which includes a first sliding member 31, a second sliding member 32 and a filtering member 33, wherein the first sliding member 31 is slidably disposed in the blocking cavity 420 of the blocking device 4, and has a filtering cavity 310 axially penetrating the first sliding member 31 and a first sliding member distal end 311 located at one end of the first sliding member 31; the second sliding member 32 is slidably disposed in the filtering cavity 310 of the first sliding member 31, and has a second sliding member distal end 321 located at one end of the second sliding member 32; the opposite sides of the filtering member 33 are respectively connected to the second sliding member distal end 321 and the first sliding member distal end 311, and the filtering member 33 can be deformed according to the change of the relative distance between the first sliding member distal end 311 and the second sliding member distal end 321, so as to be in a first expanded state or a first contracted state.

[0054] The blocking member 43 can be in the second contracted state and received in the outer sheath cavity 20 of the outer sheath 2 , and at the same time, the filter member 33 can be in the first contracted state and received in the blocking cavity 420 of the blocking device 4 .

[0055] The filtering device 3 as a whole can move relative to the outer sheath 2 and the blocking device 4 along the direction of the outer sheath proximal end 22 toward the outer sheath distal end 21, so that the filter element 33 in the first contracted state extends out from the blocking cavity 420 and the outer sheath cavity 20 and is exposed; and in this state, the first sliding member 31 of the filtering device 3 can further move relative to the blocking device 4 and the second sliding member 32 along the direction of the outer sheath proximal end 22 toward the outer sheath distal end 21, so that the relative distance between the second sliding member distal end 321 and the first sliding member distal end 311 is shortened, and the filter element 33 is switched from the first contracted state to the first expanded state, so as to filter the cancer thrombus in the blood vessel.

[0056] When the filter element 33 is in the first expanded state, the blocking device 4 as a whole can move relative to the filter device 3 and the outer sheath 2 along the proximal end 22 of the outer sheath toward the distal end 21 of the outer sheath, so that the blocking member 43 in the second contracted state extends from the outer sheath cavity 20 and is exposed. Then, the exposed blocking member 43 can also be switched from the second contracted state to the second expanded state to block the blood flow in the blood vessel.

[0057] In one embodiment, the blocking device 4 may also be designed as a three-layer casing design similar to the filtering device 3 , that is, the blocking device 4 further includes a third sliding member 41 and a fourth sliding member 42 . Among them, the third sliding member 41 is slidably arranged in the outer sheath cavity 20 of the outer sheath 2, and has a sliding cavity 410 axially penetrating the third sliding member 41, and a third sliding member distal end 411 located at one end of the third sliding member 41; the fourth sliding member 42 is slidably arranged in the sliding cavity 410 of the third sliding member 41, and has a blocking cavity 420 axially penetrating the fourth sliding member 42, and also has a fourth sliding member distal end 421 at one end of the fourth sliding member 42; the opposite sides of the blocking member 43 are respectively connected to the third sliding member distal end 411 and the fourth sliding member distal end 421, and the blocking member 43 can be deformed according to the change of the relative distance between the third sliding member distal end 411 and the fourth sliding member distal end 421, so as to be in a second expanded state or a second contracted state. Specifically, the third sliding member 41 can be moved relative to the outer sheath 2 and the fourth sliding member 42 along the direction from the outer sheath proximal end 22 toward the outer sheath distal end 21 so that the relative distance between the third sliding member distal end 411 and the fourth sliding member distal end 421 is shortened, thereby switching the blocking member 43 from the second contracted state to the second expanded state.

[0058] like Figure 5A and Figure 5B As shown, in this embodiment, the blocking member 43 is, for example, a braided wire occluder, and its internal structure design can be roughly the same as the above-mentioned filter element 33. The difference is that the outer layer of the blocking member 33 is coated with a blocking film without gaps to achieve the purpose of blocking the blood flow in the blood vessel.

[0059] During specific operation, the second sliding member 32 of the filtering device 3 can be acted upon by the first external force to drive the first sliding member 31 to synchronously move relative to the outer sheath 2 and the blocking device 4 along the direction from the outer sheath proximal end 22 to the outer sheath distal end 21, so that the filtering device 3 as a whole moves relative to the outer sheath 2 and the blocking device 4, so that the filtering member 33 portion of the filtering device 3 in the first contracted state (i.e., the second sliding member distal end 321 and the first sliding member distal end 311) extends out from the blocking cavity 420 of the blocking device 4 and the outer sheath cavity 20 of the outer sheath 2 and is exposed; in this state, the first sliding member 31 of the filtering device 3 can be further acted upon by the second external force to perform bidirectional movement relative to the blocking device 4 and the second sliding member 32, so as to adjust the relative distance between the second sliding member distal end 321 and the first sliding member distal end 311, so that the filtering member 33 switches from the first contracted state to the first expanded state, and accurately adjusts the diameter of the filter formed by the filtering member 33 in the first expanded state, so as to filter the cancer thrombus in the blood vessel.

[0060] When the filter element 33 is in the first expanded state, the fourth sliding member 42 of the blocking device 4 can be driven by the third external force to synchronously move the third sliding member 41 along the proximal end 22 of the outer sheath toward the distal end 21 of the outer sheath relative to the filter device 3 and the outer sheath 2, so that the blocking device 4 moves as a whole relative to the filter device 3 and the outer sheath 2, so that the blocking member 43 in the second contracted state (i.e., the distal end 411 of the third sliding member and the distal end 421 of the fourth sliding member) extends out from the outer sheath cavity 20 and is exposed. In this embodiment, the exposed blocking member 43 is located at the filter element 33's outer sheath distal end 21; in this state, the third sliding member 41 of the blocking device 4 can be further affected by the fourth external force and perform bidirectional movement relative to the outer sheath 2 and the fourth sliding member 42, so as to adjust the relative distance between the third sliding member distal end 411 and the fourth sliding member distal end 421, so as to switch the blocking member 43 from the second contracted state to the second expanded state, and accurately adjust the diameter of the occluder formed by the blocking member 43 in the second expanded state to fully fit the inner wall of the blood vessel, thereby achieving the purpose of blocking the blood flow in the blood vessel.

[0061] In another embodiment, the cancer thrombus auxiliary removal device 7 may further include an operating handle 6. Figure 3AAs shown, the operating handle 6 of this embodiment can be fixedly connected to the outer sheath 2, and the operating handle 6 is further provided with a first operating unit 61 connected to the second sliding member 32 of the filter device 3 for applying a first external force; a second operating unit 62 connected to the first sliding member 31 of the filter device 3 for applying a second external force; a third operating unit 63 connected to the fourth sliding member 42 of the blocking device 4 for applying a third external force; and a fourth operating unit 64 connected to the third sliding member 41 of the blocking device 4 for applying a fourth external force. In other embodiments, a positioning unit 65 is further provided inside the operating handle 6, which respectively positions the first operating unit 61, the second operating unit 62, the third operating unit 63 and the fourth operating unit 64 inside the operating handle 6 to achieve the technical effect of positioning the first sliding member 31, the second sliding member 32, the third sliding member 41 and the fourth sliding member 42. Preferably, as Figure 3B As shown, the positioning unit 65 disposed inside the operating handle 6 may include a segmented positioning structure, so as to achieve the technical effect of accurately controlling the location of the filter element 33 and the blocking element 43 in the blood vessel and the specific deployment form (e.g., the diameter after deployment) of the filter element 33 and the blocking element 43. In a preferred state, the overall thickness of the filter element 33 in the first deployment state and the blocking element 43 in the second deployment state is as thin as possible, and the spacing distance between the filter element 33 and the blocking element 43 is as close as possible.

[0062] In another embodiment, the entire filtering device 3 can also be partially or completely withdrawn from the blocking cavity 420 through the proximal end of the blocking cavity 420, so that at least a portion of the blocking cavity 420 of the blocking device 4 forms a cavity. At the same time, the cancer thrombus auxiliary removal device 7 of the present application can also include a suction device 8, which can be connected to the blocking cavity 420 to discharge the gas in the blood vessel through the blocking cavity 420. Please refer to Figure 3C In this embodiment, a suction port 66 connected to the blocking cavity 420 of the blocking device 4 is also provided on the operating handle 6. The suction device 8 can be connected to the suction port 66 to connect the suction device 6 with the blocking cavity 420, so as to suck out the gas that may remain in the blood vessel to prevent the formation of gas embolism.

[0063] In addition, an additional blocking structure (not shown) may be provided in the blocking channel 420 according to the actual diameter of the blocking channel 420 in the blocking device 4, so as to prevent a large amount of blood in the blood vessel from seeping out through the gap due to a gap between the filtering device 3 and the blocking device 4 being too large (i.e., a gap between the inner wall of the blocking channel 420 and the outer wall of the first sliding member 31 of the filtering device 3 being too large).

[0064] In another embodiment, the cancer embolus filtering assembly 1 further includes a developing member 5, which can be disposed or formed on at least one of the third sliding member distal end 411, the fourth sliding member distal end 421, the second sliding member distal end, and the first sliding member distal end, that is, one side or two opposite sides of the blocking member 43 and one side or two opposite sides of the filter 33, so as to facilitate clear observation of the location of the filter 33 and the blocking member 43 in the blood vessel and their deployment form. In this embodiment, the developing member 5 is, for example, a developing material or a developing coating.

[0065] The following will be combined FIG. 6A to FIG. 6K The operation method of the cancer thrombus assisted removal device 7 of the present application is described in detail so that those skilled in the art can more clearly understand the significant technical effects of the cancer thrombus assisted removal device 7. The operation method mainly includes the following steps:

[0066] First, the outer sheath 2 is placed through the patient's jugular vein at the upper level of the renal vein (i.e., the outer sheath 2 is positioned at a preset position in the blood vessel), the outer sheath 2 is fixed on the patient's body surface (for example, by suturing or gluing), and the filter device 3 is inserted into the blocking cavity 420 of the blocking device 4, and the blocking device 4 is inserted into the patient's body through the outer sheath cavity 20 of the outer sheath 2 until it reaches the vicinity of the cancer thrombus.

[0067] like FIG. 6A to FIG. 6B As shown, the first operating unit 61 is pushed (and the second operating unit 62 is driven at the same time) so that the second sliding member 32 of the filter device 3 drives the first sliding member 31 to synchronously move along the direction of the proximal end 22 of the outer sheath toward the distal end 21 of the outer sheath relative to the outer sheath 2 and the blocking device 4, so that the filter device 3 as a whole moves relative to the outer sheath 2 and the blocking device 4, and the filter element 33 in the first contracted state is extended from the blocking cavity 420 and the outer sheath cavity 20 to be exposed, and the blocking element 43 is kept housed in the outer sheath cavity 20.

[0068] like Figure 6C As shown, the second operating unit 62 is pushed to move the first sliding member 31 relative to the blocking device 4 and the second sliding member 32, so that the exposed filter 33 is switched from the first contracted state to the first expanded state to filter the cancer thrombus in the blood vessel.

[0069] like Fig.6D As shown, the third operating unit 63 is pushed (and the fourth operating unit 64 is driven at the same time) so that the fourth sliding member 42 of the blocking device 4 drives the third sliding member 41 to synchronously move along the direction of the proximal end 22 of the outer sheath toward the distal end 21 of the outer sheath relative to the filtering device 3 and the outer sheath 2, so that the blocking device 4 as a whole moves relative to the filtering device 3 and the outer sheath 2, and the blocking member 43 in the second contracted state extends from the outer sheath cavity 20 and is exposed.

[0070] like Fig. 6EAs shown, the fourth operating unit 64 is pushed to move the third sliding member 41 relative to the outer sheath 2 and the fourth sliding member 42, so that the exposed blocking member 43 switches from the second contracted state to the second expanded state to block the blood flow in the blood vessel at the rear end of the filter member 33.

[0071] like Fig. 6F As shown, during the operation, the size of the blocking member 43 can be precisely adjusted by further adjusting the position of the fourth operating unit 64 .

[0072] like Figure 6G As shown, after the cancer thrombus in the blood vessel is cleared, the first operating unit 61 and / or the second operating unit 62 can be pushed to restore the filter element 33 from the first expanded state to the first contracted state.

[0073] like Figure 6H As shown, by pushing the first operating unit 61 and the second operating unit 62, the filter device 3 is partially or completely withdrawn from the blocking cavity 420, so that at least a portion of the blocking cavity 420 forms a cavity (at Figure 6H In the embodiment shown, the filter device 3 is partially withdrawn from the blocking cavity 420, that is, the filter element 33 in the first contracted state is left in the blocking cavity 420. It should be noted that in other embodiments, for example, when a large amount of cancer embolus tissue is hanging in the filter element 33, the filter element 33 can be pushed further to the distal end (for example, the filter element 33 is pushed further downward to make it close to the incision (not shown) of the blood vessel), and the filter element 33 with the cancer embolus tissue is directly cut off (through the incision of the blood vessel), and then the remaining part of the filter device 3 is withdrawn through the blocking cavity 420.

[0074] like Fig.6I and Figure 6JAs shown, after the filter device 3 is withdrawn, the fixed position of the blocking member 43 in the blood vessel can be further adjusted according to the actual surgical operation requirements. For example, by pushing the third operating unit 63 and the fourth operating unit 64, the blocking member 43 is moved down from the position between the heart and the hepatic vein to the position between the hepatic vein and the renal vein, thereby opening the liver blood flow in advance to reduce the warm ischemia time and reduce the surgical risk (III / II down to II / I grade surgery). Specifically, most existing surgeries use extravascular blocking. Since extravascular blocking uses clamps or rubber tubes to prevent the backflow of venous blood, the use of clamps or rubber tubes requires a larger operating space and frees more tissues. The position of the clamp or rubber tube also needs to be adjusted during the operation, and the clamp or rubber tube itself also has the risk of detachment during the operation. Compared with the existing extravascular blockade, the present application utilizes the occluding member 43 to achieve internal blockade in the blood vessel, which can get rid of the various disadvantages of using clips. During the operation, the position of the occluding member 43 in the blood vessel can be adjusted as the cancer thrombus is cleared, and the blood flow to the liver can be opened in advance to reduce the time of warm ischemia, so as to reduce the high-position cancer thrombus to a low-position cancer thrombus, or a first-level cancer thrombus.

[0075] Next, the lower blood supply (ie, the blood flow at the lower end of the renal vein) can be opened, and the gas in the blood vessel can be discharged by blocking the lumen 420 .

[0076] Then, if Figure 6K As shown, by operating the third operating unit 63 and the fourth operating unit 64, the blocking member 43 is restored from the second expanded state to the second contracted state, and the blocking device 4 is withdrawn from the outer sheath cavity 20 as a whole, thereby ending the surgical operation.

[0077] In summary, the cancer thrombus filtering component of the present application utilizes a three-layer sleeve design of an outer sheath, a first sliding member, and a second sliding member, which can increase the positioning effect of the filtering device in the blood vessel and accurately control the diameter of the filter element when it is in an expanded state to meet the use requirements of blood vessels of different diameters and improve the filtering effect of cancer thrombi.

[0078] Furthermore, the cancer thrombus assisted removal device designed based on the cancer thrombus filtering component can filter the cancer thrombus in the blood vessel while blocking the blood flow in the blood vessel by internal blocking, so as to assist in the removal of vascular cancer thrombus, improve the safety of the surgical operation, and thus meet the needs of more difficult surgical operations.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cancer thrombus filtering assembly for filtering cancer thrombus in a blood vessel, characterized in that: include: An outer sheath is positioned at a preset position in the blood vessel and has an outer sheath lumen axially penetrating the outer sheath and an outer sheath distal end and an outer sheath proximal end located at opposite ends of the outer sheath; as well as A filtering device comprising: A first sliding member, which is slidably disposed in the outer sheath cavity and has a filtering cavity axially penetrating the first sliding member and a first sliding member distal end located at one end of the first sliding member; A second sliding member, which is slidably disposed in the filter cavity and has a second sliding member distal end located at one end of the second sliding member; and A filter element, wherein opposite sides of the filter element are respectively connected to the distal end of the second sliding element and the distal end of the first sliding element, and the filter element can be deformed according to the change of the relative distance between the distal end of the first sliding element and the distal end of the second sliding element to be in a first expanded state or a first contracted state; and wherein, The filter element can be in the first contracted state and accommodated in the outer sheath cavity; The filtering device as a whole can move relative to the outer sheath in a direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filtering element in the first contracted state extends out of the outer sheath cavity and is exposed; The first sliding member can move relative to the outer sheath and the second sliding member along the direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the relative distance between the distal end of the second sliding member and the distal end of the first sliding member is shortened, so that the exposed filter element is switched from the first contracted state to the first expanded state, thereby filtering the cancer thrombus in the blood vessel.

2. The cancer embolus filtering assembly according to claim 1, characterized in that: The cancer embolus filtering assembly further includes a developing member, which is disposed or formed at a distal end of the second sliding member and / or a distal end of the first sliding member.

3. The cancer embolus filtering assembly according to claim 1, characterized in that: The filter element is a filter formed by weaving or laser cutting a plurality of nickel-titanium alloy wires.

4. The cancer embolus filtering assembly according to claim 3, characterized in that: The diameter of the filter screen formed by the filter element in the first expanded state is adjusted by adjusting the relative distance between the distal end of the second sliding element and the distal end of the first sliding element.

5. The cancer embolus filtering assembly according to claim 4, characterized in that: The filter element may also be covered with an adjustment membrane having pores, so as to adjust the pores of the filter screen.

6. The cancer embolus filtering assembly according to claim 1, characterized in that: The second sliding member can be acted upon by a first external force to drive the first sliding member to synchronously move relative to the outer sheath along the direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the filtering device as a whole moves relative to the outer sheath; and The first sliding member can be bidirectionally moved relative to the outer sheath and the second sliding member by a second external force, so as to adjust the relative distance between the distal end of the second sliding member and the distal end of the first sliding member.

7. The cancer embolus filtering assembly according to claim 6, characterized in that: The cancer thrombus filtering assembly further includes an operating handle for applying the first external force or the second external force.

8. A cancer thrombus auxiliary removal device, used to assist in the removal of cancer thrombus in blood vessels, characterized in that: include: An outer sheath is positioned at a preset position in the blood vessel and has an outer sheath lumen axially penetrating the outer sheath and an outer sheath distal end and an outer sheath proximal end located at opposite ends of the outer sheath; A blocking device, which is slidably disposed in the outer sheath cavity and has a blocking cavity axially penetrating the blocking device, and a blocking member disposed at the distal end of the blocking cavity and switchable between a second contracted state and a second expanded state; as well as A filtering device comprising: A first sliding member, which is slidably disposed in the blocking cavity and has a filtering cavity axially penetrating the first sliding member and a first sliding member distal end located at one end of the first sliding member; A second sliding member, which is slidably disposed in the filter cavity and has a second sliding member distal end located at one end of the second sliding member; as well as A filter element, wherein opposite sides of the filter element are respectively connected to the distal end of the second sliding element and the distal end of the first sliding element, and the filter element can be deformed according to the change of the relative distance between the distal end of the first sliding element and the distal end of the second sliding element to be in a first expanded state or a first contracted state; and wherein, The blocking member can be in the second contracted state and accommodated in the outer sheath cavity, and the filter can be in the first contracted state and accommodated in the blocking cavity; The filtering device as a whole can move relative to the outer sheath and the blocking device along the direction from the proximal end of the outer sheath to the distal end of the outer sheath, so that the filtering element in the first contracted state extends out from the blocking cavity and the outer sheath cavity to be exposed; The first sliding member can move relative to the blocking device and the second sliding member along the direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the relative distance between the distal end of the second sliding member and the distal end of the first sliding member is shortened, and the filter element is switched from the first contracted state to the first expanded state, so as to filter the cancer thrombus in the blood vessel; The blocking device as a whole can be moved relative to the filtering device and the outer sheath along the direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the blocking member in the second contracted state can extend from the outer sheath cavity and be exposed outside, and the exposed blocking member can be switched from the second contracted state to the second expanded state to block the blood flow in the blood vessel.

9. The cancer thrombus auxiliary removal device according to claim 8, characterized in that: The blocking device also includes: A third sliding member is slidably disposed in the outer sheath cavity and has a sliding cavity axially penetrating the third sliding member and a third sliding member distal end located at one end of the third sliding member; A fourth sliding member is slidably disposed in the sliding cavity and has the blocking cavity axially penetrating the fourth sliding member, and a fourth sliding member distal end is also provided at one end of the fourth sliding member; wherein, The opposite sides of the blocking member are respectively connected to the distal end of the third sliding member and the distal end of the fourth sliding member, and the blocking member can be deformed according to the change of the relative distance between the distal end of the third sliding member and the distal end of the fourth sliding member to be in the second expanded state or the second contracted state; and wherein, The third sliding member can move relative to the outer sheath and the fourth sliding member along the direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the relative distance between the distal ends of the third sliding member and the fourth sliding member is shortened, and the blocking member is switched from the second contracted state to the second expanded state.

10. The cancer thrombus auxiliary removal device according to claim 9, characterized in that: The blocking piece is a braided wire blocking device.

11. The cancer thrombus auxiliary removal device according to claim 9, characterized in that: The second sliding member can be acted upon by a first external force to drive the first sliding member to synchronously move relative to the outer sheath and the blocking device along the direction from the proximal end of the outer sheath to the distal end of the outer sheath, so that the filtering device as a whole moves relative to the outer sheath and the blocking device; The first sliding member can be bidirectionally moved relative to the blocking device and the second sliding member by a second external force, so as to adjust the relative distance between the distal end of the second sliding member and the distal end of the first sliding member; The fourth sliding member can be acted upon by a third external force to drive the third sliding member to synchronously move relative to the filter device and the outer sheath in a direction from the proximal end of the outer sheath toward the distal end of the outer sheath, so that the blocking device as a whole moves relative to the filter device and the outer sheath; The third sliding member can be bidirectionally moved relative to the outer sheath and the fourth sliding member by a fourth external force, so as to adjust the relative distance between the distal end of the third sliding member and the distal end of the fourth sliding member.

12. The cancer thrombus auxiliary removal device according to claim 11, characterized in that: The cancer thrombus auxiliary removal instrument also includes an operating handle, which has a first operating unit for applying the first external force, a second operating unit for applying the second external force, a third operating unit for applying the third external force, and a fourth operating unit for applying the fourth external force.

13. The cancer thrombus auxiliary removal device according to claim 12, characterized in that: The operating handle further includes a positioning unit for positioning the first operating unit, the second operating unit, the third operating unit, and the fourth operating unit respectively.

14. The cancer thrombus auxiliary removal device according to claim 13, characterized in that: The positioning unit also has a segmented positioning structure.

15. The cancer thrombus auxiliary removal device according to claim 9, characterized in that: The filtering device can also be partially or completely withdrawn from the blocking cavity through the proximal end of the blocking cavity, so that at least a portion of the blocking cavity forms a cavity.

16. The cancer thrombus auxiliary removal device according to claim 15, characterized in that: The cancer thrombus auxiliary removal device also includes a suction device, which is communicated with the blocking cavity to discharge the gas in the blood vessel through the blocking cavity.

17. The cancer thrombus auxiliary removal device according to claim 9, characterized in that: The cancer thrombus auxiliary removal instrument also includes a developing member, which is arranged or formed on at least one of the distal end of the third sliding member, the distal end of the fourth sliding member, the distal end of the second sliding member, and the distal end of the first sliding member.

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