Control rod group, thrombectomy device and thrombectomy device kit

Abstract

The utility model discloses a control rod set, a thrombectomy device and a thrombectomy device kit, and relates to the technical field of medical instruments. The control rod group disclosed by the utility model is applied to the thrombectomy device. The control rod set comprises a first rod body and a second rod body, the first rod body coaxially penetrates through the second rod body, the far end of the first rod body is used for fixedly installing the far end of a thrombectomy net of the thrombectomy device, the far end of the second rod body is used for fixedly installing the near end of the thrombectomy net, and the far end of the second rod body is used for fixedly installing the near end of the thrombectomy net. The first rod body and the second rod body are movably arranged and are used for driving the thrombectomy net to expand or contract; and in the circumferential direction of the control rod group, the first rod body is positioned and mounted relative to the second rod body, so that the first rod body and the second rod body are matched in a rotation stopping manner. The scheme at least can be used for solving the problem that the thrombus capturing effect of a thrombus taking net in the related technology is poor.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a control rod assembly, a thrombus removal device, and a thrombus removal device kit. Background Art

[0002] Mechanical thrombectomy has been increasingly used in the prevention and treatment of cerebral infarction, myocardial infarction and other diseases caused by vascular occlusion due to its superior safety and good prognosis. Among them, stent-type thrombectomy devices are more popular in the industry due to their simple operation and high success rate of thrombus capture.

[0003] In the related art, the stent-type thrombectomy device includes a thrombectomy net and a control rod group connected to the thrombectomy net. During the operation, when the thrombectomy net reaches the target thrombus, the control rod group can be operated on the handle side of the thrombectomy device to expand the thrombectomy net, and then the thrombectomy device can be pulled to remove the thrombus. However, in practice, the thrombectomy net of the above-mentioned related art thrombectomy device has a poor thrombus catching effect. Utility Model Content

[0004] The present application provides a control rod group, a thrombus removal device and a thrombus removal device kit, which can at least be used to solve the problem of poor thrombus catching effect of the thrombus removal net in the related art.

[0005] In a first aspect, an embodiment of the present application provides a control rod group, which is applied to a thrombus removal device. The control rod group includes a first rod body and a second rod body, wherein: the first rod body is coaxially arranged in the second rod body, the distal end of the first rod body is used to fix the distal end of the thrombus removal net of the thrombus removal device, and the distal end of the second rod body is used to fix the proximal end of the thrombus removal net, and the first rod body and the second rod body are movably arranged to drive the thrombus removal net to expand or contract; in the circumferential direction of the control rod group, the first rod body is positioned and installed relative to the second rod body to achieve a non-rotation fit between the two.

[0006] In some embodiments of the present application, the control rod group also includes a connecting piece, and the control rod group can be installed on the handle shell of the thrombus removal device through the connecting piece; the connecting piece is sleeved outside the first rod body and the second rod body, and among the first rod body and the second rod body, one is fixedly connected to the connecting piece, and the other is movably arranged relative to the connecting piece, and is positioned and matched with the connecting piece in the circumferential direction of the control rod group.

[0007] In some embodiments of the present application, the connecting member is a connecting tube, and the control rod group also includes a slider fixedly installed on the outer circumference of the first rod body or the second rod body, the slider is slidably arranged along the pipeline of the connecting tube, and along the circumference of the control rod group, the slider is positioned and matched with the inner circumference of the connecting tube.

[0008] In some embodiments of the present application, one of the inner circumferential surfaces of the slider and the connecting tube is provided with an arc-shaped protrusion, and the other is provided with an arc-shaped groove, and the slider and the connecting tube are positioned and matched by the arc-shaped protrusion and the arc-shaped groove.

[0009] In some embodiments of the present application, the connecting member is fixedly connected to the proximal end of the second rod body, and the proximal end of the first rod body extends out of the proximal end of the connecting member.

[0010] In some embodiments of the present application, the control rod group also includes a locking structure, which includes a tightening member and an elastic pressure member arranged on the proximal side of the connecting member. The tightening member is sleeved on the first rod body, and the tightening member and the proximal end of the connecting member are detachably connected. When the tightening member is installed on the connecting member, the tightening member can press the elastic pressure member against the first rod body.

[0011] In a second aspect, an embodiment of the present application provides a thrombus removal device, comprising a thrombus removal net, a handle shell, and the control rod group described in the first aspect of the embodiment of the present application, wherein the distal end of the thrombus removal net is fixedly connected to the first rod body, the distal end of the thrombus removal net is fixedly connected to the second rod body, and the first rod body or the second rod body is fixedly mounted on the handle shell.

[0012] In some embodiments of the present application, when the control rod assembly includes a connector, the connector is fixedly connected to the second rod body, the proximal end of the first rod body extends out of the proximal end of the connector, and the connector is installed at the proximal end of the handle housing.

[0013] In some embodiments of the present application, the thrombus removal device also includes an outer sleeve and a toggle member. The outer sleeve is sleeved on the first rod body and the second rod body. The toggle member is fixedly connected to the outer sleeve and is used to drive the outer sleeve to move relative to the control rod group. The handle shell is provided with a slide groove for the toggle member to move. The connecting member has a second positioning protrusion provided on its outer peripheral surface. Along the circumference of the thrombus removal device, the second positioning protrusion is positioned and matched with the slide groove.

[0014] In a third aspect, an embodiment of the present application provides a thrombus removal device kit, comprising a sheath assembly and the thrombus removal device described in the second aspect of the embodiment of the present application, wherein the insertion portion of the thrombus removal device can be plugged into and matched with the sheath assembly.

[0015] The technical solution adopted in the embodiments of the present application can achieve the following beneficial effects:

[0016] In the control rod assembly disclosed in the embodiment of the present application, the first rod body is positioned and installed relative to the second rod body in the circumferential direction of the control rod assembly to achieve a non-rotation fit between the two. With such a layout, the relative positions of the first rod body and the second rod body in the circumferential direction are fixed, and even if the two are subjected to a torsional force due to accidental contact during the relative movement, the torsional force will be offset due to the non-rotation fit relationship between the two, thereby ensuring that the thrombus removal net at the far end of the control rod assembly will not be twisted, so that the thrombus removal device has a better thrombus catching effect.

[0017] Secondly, when the first rod body is positioned and installed relative to the second rod body along the circumferential direction of the control rod group, there is only a relative movement degree of freedom between the two. In this way, when the operator operates the control rod group, the force applied by the operator is only used to achieve the relative movement of the two rod bodies, and no part of the force is consumed to achieve relative rotation. This can improve the operational sensitivity of the control rod group and optimize the operator's operating experience.

[0018] In addition, since the control rod group of the embodiment of the present application can prevent the thrombus removal net from twisting, damage to the thrombus removal net caused by twisting is avoided, thereby achieving the beneficial effects of the thrombus removal net still having excellent toughness after long-term use, the mesh sizes of each mesh being relatively uniform in the expanded state, and the service life being extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0020] In the attached picture:

[0021] Figure 1 A schematic diagram of the structure of a thrombus removal device disclosed in some embodiments of the present application;

[0022] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0023] Figure 3 This is an exploded schematic diagram of a thrombus removal device disclosed in some embodiments of the present application;

[0024] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0025] Figure 5 A partial structural schematic diagram of a thrombus removal device disclosed in some embodiments of the present application (part of the connecting parts are hidden);

[0026] Figure 6 , Figure 7 and Fig. 9 A schematic diagram of the operation flow of the thrombus removal device kit disclosed in some embodiments of the present application;

[0027] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0028] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle.

[0029] Description of reference numerals:

[0030] 100-Thrombectomy device,

[0031] 110-control rod group, 111-first rod body, 112-second rod body, 113-connecting member, 113a-arc groove, 113b-second positioning protrusion, 113c-clamping protrusion, 113d-glue injection hole, 114-slider, 114a-arc protrusion, 115-locking structure, 115a-tightening member, 115b-elastic pressing member,

[0032] 120-bolt removal net, 130-handle housing, 131-slideway, 132-card slot, 140-outer sleeve, 150-actuator,

[0033] 200-Sheath Assembly. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0035] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of the thrombectomy device and its components and accessories relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0036] In order to facilitate understanding of the control rod group, thrombus removal device and thrombus removal device kit provided in the embodiments of the present application, the relevant technologies are first introduced in conjunction with application scenarios.

[0037] During some uses of related stent-type thrombectomy devices, the thrombus capture effect of the thrombus removal net may be poor, which is manifested in that the amount of thrombus captured each time is less than the usual level, and the target thrombus requires multiple thrombus removals to be completely cleared.

[0038] After research, the inventors found that the above problems are mainly caused by the distortion of the thrombectomy net during the operation and the escape of thrombi. Specifically, during the entire thrombectomy operation, the thrombectomy net needs to switch between expansion and contraction states through the control rod group to successfully complete the collection and capture of the thrombus in the blood vessel, and then take the thrombus out. However, when the operator switches the state of the thrombectomy net, it is necessary to drive the rods in the control rod group. As more sophisticated instruments, these rods are easily mis-turned. For example, when the operator accidentally touches and applies torque to the control rod group, the entire thrombectomy net is twisted. Some meshes of the twisted thrombectomy net expand due to deformation, causing the thrombus to escape.

[0039] In view of this, an embodiment of the present application provides a control rod assembly for use in a thrombus removal device.

[0040] See also Figures 1 to 10 The control rod group 110 disclosed in the embodiment of the present application includes a first rod body 111 and a second rod body 112, wherein: the first rod body 111 is coaxially arranged in the second rod body 112, the distal end of the first rod body 111 is used to fix the distal end of the thrombus removal net 120 of the thrombus removal device 100, and the distal end of the second rod body 112 is used to fix the proximal end of the thrombus removal net 120, and the first rod body 111 and the second rod body 112 are movably arranged to drive the thrombus removal net 120 to expand or contract.

[0041] It should be understood that thrombectomy usually requires the sheath to be placed in the blood vessel using a guide wire to facilitate the subsequent insertion of the insertion portion of the thrombectomy device 100 to avoid damaging the blood vessel wall. Figure 6 As shown, the thrombus removal device 100 is roughly divided into two functional parts, a handle and an insertion part, and the control rod group 110 extends in the sections of the insertion part and the handle at the same time. When removing the thrombus, the part of the control rod group 110 close to the thrombus removal net 120 (i.e., the insertion part) needs to be guided through the sheath and extended to the target thrombus of the blood vessel. For example, reference can be made to Figure 6 The outer sleeve 140 (a part of the insertion part of the control rod assembly 110) extends out of the sheath. Of course, in order to improve the smoothness of the insertion of the thrombus removal device 100, the first rod body 111 can be provided with an axial channel to facilitate the passage of a guide wire, thereby entering the blood vessel along the guide wire.

[0042] In the embodiment of the present application, based on the above structural layout, the first rod body 111 and the second rod body 112 can be driven to move relative to each other by operating the control rod group 110 to change the positional relationship between the two, thereby switching the thrombus removal net 120 between the expansion state and the contraction state.

[0043] In the specific operation process, the first rod 111 can be pulled toward the proximal side of the thrombus removal device 100. The pulling direction can be referred to as Figure 7 The dotted arrow on the right side of the figure indicates that the distal end of the first rod body 111 is moving closer to the distal end of the second rod body 112. Figure 7 The dotted arrow on the left side of the middle indicates that the distance between the two distal ends is reduced, and the two axial ends of the thrombus removal net 120 are gathered together, so that the entire net frame is arched inward, that is, it switches to the expanded state; the first rod body 111 can be pushed toward the distal end of the thrombus removal device 100, and the distal end of the first rod body 111 will move away from the distal end of the second rod body 112, that is, the distance between the two distal ends increases, and the distance between the two axial ends of the thrombus removal net 120 also increases, so that the entire net frame is stretched, that is, it switches to the contracted state. Please compare with reference Figure 8 and Fig.10, the distance between the distal end of the first rod body 111 and the distal end of the second rod body 112 is reduced, and the thrombus removal net 120 expands radially.

[0044] It is worth noting that when the thrombus removal net 120 is in a contracted state, its radial dimension is relatively small, so during the insertion of the thrombus removal device 100, the thrombus removal net 120 is usually adjusted to a contracted state to facilitate the insertion action; at the same time, the thrombus removal net 120 in this state is also convenient for passing through the thrombus, avoiding the capture of the thrombus and preventing the thrombus from being pushed into the narrow part of the blood vessel and causing occlusion.

[0045] When the thrombus removal net 120 is in the expanded state, it mainly expands radially, and its entire frame will be able to roughly occupy the space in the blood vessel. Therefore, after the thrombus removal net 120 enters the target part of the blood vessel, it is usually necessary to make the thrombus removal net 120 reach the target thrombus farther in the blood vessel, and it is necessary to switch the thrombus removal net 120 from the contracted state to the expanded state. Subsequently, by controlling the thrombus removal device 100 to retreat, the thrombus will be captured in the thrombus removal net 120 and exit the blood vessel with the thrombus removal net 120.

[0046] The embodiments of the present application do not impose any specific restrictions on the thrombus removal net 120, as long as it can switch states to capture thrombi.

[0047] Exemplarily, the thrombus removal net 120 can be of a self-expanding type, which is conducive to switching from a contracted state to an expanded state; at the same time, the self-expanding thrombus removal net 120 can maintain a preset shape for a long time in the expanded state, which will have many local advantages, such as being able to provide the largest space to accommodate blood clots and avoid mesh collapse.

[0048] For example, the proximal end of the thrombus removal net 120 is open to facilitate the entry of thrombi into the thrombus removal net 120 during the retraction process. Alternatively, the mesh size of the proximal portion of the thrombus removal net 120 is set larger, which can also improve the efficiency of thrombus capture. In addition, the mesh size of the distal portion of the thrombus removal net 120 can be set smaller to prevent thrombi from escaping.

[0049] At the same time, in the embodiment of the present application, in the circumferential direction of the control rod group 110, the first rod body 111 is positioned and installed relative to the second rod body 112 to achieve a non-rotation fit between the two. It should be understood that under such a setting, the relative positions of the first rod body 111 and the second rod body 112 in the circumferential direction are fixed, and even if the two are subjected to a torsional force due to accidental contact during the relative movement, the torsional force will be offset due to the non-rotation fit relationship between the two, thereby ensuring that the thrombus removal net 120 at the far end of the control rod group 110 will not be twisted, so that the thrombus removal device 100 has a better thrombus catching effect.

[0050] In addition, when the first rod body 111 is positioned and installed relative to the second rod body 112 along the circumferential direction of the control rod group 110, there is only a relative movement degree of freedom between the two. In this way, when the operator operates the control rod group 110, the force applied by the operator is only used to achieve the relative movement of the two rod bodies, and no part of the force is consumed to achieve relative rotation. This can improve the operational sensitivity of the control rod group 110 and optimize the operator's operating experience.

[0051] Of course, when the control rod group 110 of the embodiment of the present application is able to prevent the thrombus removal net 120 from twisting, damage to the thrombus removal net 120 caused by twisting can also be avoided, thereby reflecting more beneficial effects, such as ensuring that the thrombus removal net 120 still has excellent toughness after long-term use, the mesh sizes are relatively uniform in the expanded state, and the service life is extended.

[0052] The embodiments of the present application do not limit the specific positioning and installation relationship between the first rod body 111 and the second rod body 112 .

[0053] Exemplarily, the outer circumference of the first rod body 111 and the inner circumference of the second rod body 112 are respectively provided with matching positioning structures, and the two achieve positioning matching along the circumference of the control rod assembly 110 through the cooperation of the positioning structures.

[0054] In some other embodiments, the control rod assembly 110 further includes a connecting piece 113, and the control rod assembly 110 can be installed on the handle housing 130 of the thrombus removal device 100 through the connecting piece 113; the connecting piece 113 is sleeved outside the first rod body 111 and the second rod body 112, and one of the first rod body 111 and the second rod body 112 is fixedly connected to the connecting piece 113, and the other is movably arranged relative to the connecting piece 113, and is positioned and matched with the connecting piece 113 in the circumferential direction of the control rod assembly 110. For example, as Figure 1 to Figure 5 As shown, the second rod 112 is fixedly connected to the connecting piece 113, the first rod 111 is inserted into the connecting piece 113 and can move relatively, and the first rod 111 is positioned and matched with the connecting piece 113 in the circumferential direction of the control rod group 110, so as to be positioned and installed relative to the second rod 112.

[0055] It should be understood that the first rod body 111 and the second rod body 112 are structures that will enter the human blood vessels, and their radial dimensions are very small. If the two are to achieve direct positioning cooperation, especially if a positioning structure needs to be machined on the inner circumference of the second rod body 112, the processing requirements are extremely high, which will lead to excessively high costs and low production efficiency.

[0056] In this example, by sleeve-mounting the connector 113 on the outside of the first rod body 111 and the second rod body 112, no matter whether the connector 113 is positioned and installed with the first rod body 111 or the second rod body 112, since the connector 113 will not be inserted into the blood vessel, its radial dimension can be set to be relatively larger, and the difficulty of machining the positioning structure on the inner circumference of the connector 113 is relatively lower, which is conducive to reducing processing costs and improving production efficiency.

[0057] It is worth mentioning that it is easier to machine the positioning structure on the inner circumference of the connector 113 , which means that the machining accuracy of the positioning structure can be higher, thereby improving the positioning and assembly accuracy between the first rod 111 and the second rod 112 .

[0058] Furthermore, the connecting member 113 is a connecting tube, and the control rod assembly 110 further includes a slider 114 fixedly mounted on the outer circumference of the first rod body 111 or the second rod body 112, the slider 114 is slidably arranged along the pipeline of the connecting tube, and along the circumference of the control rod assembly 110, the slider 114 is positioned and matched with the inner circumference of the connecting tube. Figure 5 As shown, a slider 114 is provided on the outer circumferential surface of the first rod body 111 , and the first rod body 111 is positioned and matched with the connecting tube along the circumferential direction of the control rod assembly 110 through the slider 114 .

[0059] It should be understood that in this example, the connecting tube, as a structure with a certain extended length, can provide a longer sliding stroke for the slider 114 located in its pipe to meet the movement requirements of the first rod body 111 or the second rod body 112. This is related to the size model of the thrombus removal net 120, because the movement of the first rod body 111 or the second rod body 112 is to switch the state of the thrombus removal net 120.

[0060] It is worth noting that in this example, the slider 114 slides in the pipe of the connecting tube, which means that the slider 114 is set to a smaller size. In this way, when the slider 114 is fixed to the first rod body 111 or the second rod body 112, the contact area with the inner surface of the connecting tube is smaller, the friction is smaller, and at the same time, the weight of the first rod body 111 or the second rod body 112 that needs to be moved is not significantly increased, thereby facilitating the operator to perform the operation with less force, which is more conducive to the operator to perform precise operation.

[0061] In addition, the slider 114 has a smaller mass, which means that the kinetic energy generated by the first rod 111 or the second rod 112 when moving is smaller, which can reduce the disturbance amplitude of the blood in the blood vessel caused by the first rod 111 or the second rod 112, reduce the impact on the blood signs in the human body, and avoid unexpected damage to the thrombus and cause it to escape.

[0062] The embodiments of the present application do not limit the specific positioning and matching methods between the structures that need to be positioned and matched in the aforementioned schemes. For example, they may include a magnetic positioning method and a positioning and matching method of a protrusion and a positioning groove.

[0063] like Figure 5 As shown, the outer circumference of the slider 114 is provided with a first positioning protrusion, and the inner circumference of the connecting tube is provided with a positioning groove. The first positioning protrusion and the positioning groove can realize the positioning cooperation of the control rod group 110 in the circumferential direction.

[0064] Furthermore, if Figure 5 As shown, in the inner circumference of the slider 114 and the connecting tube, one is provided with an arc-shaped protrusion 114a, and the other is provided with an arc-shaped groove 113a, and the slider 114 and the connecting tube are positioned and matched by the arc-shaped protrusion 114a and the arc-shaped groove 113a. It should be understood that when the arc-shaped protrusion 114a and the arc-shaped groove 113a achieve the effect of preventing rotation along the circumferential direction of the control rod group 110, the two are abutted by the arc surface, so that the abutment pressure is avoided at the sudden change of shape (such as the corner of the square protrusion), so as to avoid stress concentration, thereby preventing the slider 114 and the inner circumference of the connecting tube from being damaged.

[0065] At the same time, the arc groove 113a and the arc protrusion 114a can appropriately increase the contact area to improve the smoothness of the movement of the slider 114 in the pipe of the connecting pipe; in addition, the increase in the contact area can reduce the interaction effect between the slider 114 and the connecting pipe, which can be understood by referring to the definition of pressure. When a larger torque is applied to the first rod body 111 or the second rod body 112 due to an erroneous operation, the probability of damage to the first rod body 111 or the second rod body 112 can be reduced.

[0066] In some embodiments of the present application, the connecting member 113 can be fixedly connected to the first rod body 111, and the state switching of the thrombus removal net 120 is achieved by moving the second rod body 112. At the same time, in this example, it is usually necessary to open a sliding groove on the side of the handle housing 130 of the thrombus removal device 100 to slidably install the toggle member 150 connected to the second rod body 112 and extending out of the handle housing 130.

[0067] In some embodiments of the present application, the connector 113 is fixedly connected to the proximal end of the second rod 112, and the proximal end of the first rod 111 extends out of the proximal end of the connector 113. It should be understood that the handle housing 130 of the thrombus removal device 100 is also provided with an outer sleeve 140 sleeved outside the second rod 112, and the connector 113 in this example is connected to the proximal end of the second rod 112, which can facilitate the reasonable layout of the thrombus removal device 100 and avoid structural interference. At the same time, the first rod 111 in this example extends out of the connector 113 through its proximal end, which is conducive to the connector 113 being installed on the handle housing 130 so that the first rod 111 can extend out of the handle housing 130, thereby making it more convenient for the operator to operate and optimizing the experience.

[0068] Furthermore, if Figure 1 to Figure 5 As shown, the control rod group 110 also includes a locking structure 115, which includes a tightening member 115a and an elastic pressure member 115b arranged on the proximal side of the connecting member 113. The tightening member 115a is sleeved on the first rod body 111, and the tightening member 115a is detachably connected to the proximal end of the connecting member 113. When the tightening member 115a is installed on the connecting member 113, the tightening member 115a can press the elastic pressure member 115b against the first rod body 111.

[0069] It should be understood that the control rod group 110 is used to adjust the state of the thrombus removal net 120, so when the thrombus removal net 120 is in any state, it is better to maintain the relative position relationship between the first rod body 111 and the second rod body 112. Usually, damping can be applied to the rod body that moves due to the force applied by the operator to lock it. Exemplarily, the outer periphery of the first rod body 111 or the second rod body 112 is provided with a damping sleeve, and the damping sleeve can achieve a damping effect through friction with the corresponding structure on the handle housing 130.

[0070] In contrast, in this example, the elastic pressing member 115b is used to apply damping to the first rod 111, specifically by pressing against the first rod 111. Note that in this example, the damping applied to the first rod 111 is adjustable, and when the first rod 111 needs to move relative to the second rod 112, the locking structure 115 can be unlocked, that is, the tightening member 115a can be disassembled, so that the damping force applied to the first rod 111 by the elastic pressing member 115b can be reduced, or even almost eliminated, so that it is easy to control the smooth movement of the first rod 111 and achieve precise operation, and at the same time, the wear of the elastic pressing member 115b can be reduced.

[0071] After the first rod 111 is moved into position, it can be locked by the locking structure 115, that is, the tightening member 115a is installed in place on the connecting member 113, so that the elastic pressing member 115b can provide reliable damping force. By adjusting the tightening member 115a, the damping force of the elastic pressing member 115b on the first rod 111 can be significantly increased. Compared with the method of providing damping only by the damping sleeve, the locking effect of the first rod 111 in this example is more stable, and misoperation in the locked state can be avoided.

[0072] The embodiment of the present application does not limit the type of the locking structure 115. For example, Figure 2 , Figure 4 and Figure 5 As shown, the tightening member 115a can be a cover body that can be threadedly matched with the proximal end of the connecting member 113, and a slope is provided on its inner surface so that the slope can press the elastic pressing member 115b during the tightening process, thereby applying a damping force to the first rod body 111. Figure 7In the embodiment, the tightening member 115a can release the pressing effect of the elastic pressing member 115b by twisting. Figure 7 The hollow arrow on the right side of the middle part is used to reduce the damping effect on the first rod body 111, so as to facilitate pulling the first rod body 111, thereby expanding the thrombus removal net 120; Fig. 9 and Fig.10 , the thrombus removal device 100 is shown in a state where the tightening member 115 a is twisted and the first rod 111 is pulled.

[0073] In this example, if Figure 5 As shown, the elastic pressing member 115b may be a damping sleeve, and further, a clamping arm that facilitates deformation may be provided thereon. Alternatively, the locking structure 115 may also adopt a combination of a cam buckle and an elastic clamp.

[0074] See also Figures 1 to 10 Based on the aforementioned control rod set 110, some embodiments of the present application provide a thrombus removal device 100. The thrombus removal device 100 includes a thrombus removal net 120, a handle housing 130, and the control rod set 110 mentioned in any of the aforementioned schemes, wherein the distal end of the thrombus removal net 120 is fixedly connected to the first rod body 111, the distal end of the thrombus removal net 120 is fixedly connected to the second rod body 112, and the first rod body 111 or the second rod body 112 is fixedly mounted on the handle housing 130. In this way, the thrombus removal device 100 has the beneficial effects of the aforementioned control rod set 110, which will not be described in detail.

[0075] In some embodiments of the present application, Figure 4 and Figure 5 As shown, when the control rod assembly 110 includes the aforementioned connecting member 113 , the connecting member 113 is fixedly connected to the second rod body 112 , the proximal end of the first rod body 111 extends out of the proximal end of the connecting member 113 , and the connecting member 113 is installed at the proximal end of the handle housing 130 .

[0076] It should be understood that under such a layout, the first rod body 111 serves as a structure for adjusting the state of the thrombus removal net 120, and the connecting piece 113 serves as the middle connecting structure of the control rod group 110 in the handle shell 130. It is installed at the proximal end of the handle shell 130, so that the first rod body 111 partially extends out of the handle shell 130. In this way, the operator can conveniently manipulate the first rod body 111 on the proximal side (close to the operator) of the thrombus removal device 100 to adjust the state of the thrombus removal net 120.

[0077] Generally, the handle housing 130 may include an upper and lower housing, so that grooves may be formed at the proximal ends of the upper and lower housings, and the two housings may be matched to form an opening for installing the connecting member 113, and the connecting member 113 may be clamped in the opening to complete the assembly of the control rod assembly 110 and the handle housing 130. Specifically, as Figure 4As shown, the handle housing 130 is provided with circumferentially distributed slots 132 at corresponding positions of the openings, and the connector 113 is provided with circumferentially distributed snap-fit ​​protrusions 113 c, which can be snap-fitted into the slots 132 to achieve snap-fitting along the axial direction of the thrombus removal device 100 .

[0078] In some embodiments of the present application, Figure 1 to Figure 4 As shown, the thrombus removal device 100 also includes an outer sleeve 140 and a toggle member 150. The outer sleeve 140 is sleeved outside the first rod body 111 and the second rod body 112. The toggle member 150 is fixedly connected to the outer sleeve 140 and is used to drive the outer sleeve 140 to move relative to the control rod group 110; the handle shell 130 is provided with a slide groove 131 for the toggle member 150 to move, and the connecting member 113 has a second positioning protrusion 113b arranged on its outer circumferential surface. Along the circumference of the thrombus removal device 100, the second positioning protrusion 113b is positioned and matched with the slide groove 131.

[0079] It should be understood that in the thrombus removal device 100, the outer sleeve 140 is used to protect the first rod 111 and the second rod 112, especially to protect the thrombus removal net 120. Specifically, Figure 6 As shown, the outer sleeve 140 is usually in a position to shield the thrombus removal net 120, especially for the process of inserting the thrombus removal device 100 into the blood vessel, so as to prevent the thrombus removal net 120 from being exposed and damaged; Figure 7 to Figure 10 As shown, after the thrombus removal device 100 is inserted into place, the outer sleeve 140 can be driven to move and retract by operating the toggle member 150. The control movement direction of the toggle member 150 can refer to Figure 6 The dotted arrow in the figure shows the thrombus removal net 120, and then the control lever group 110 is operated to switch the thrombus removal net 120 to the expanded state. Therefore, in order to facilitate the operator to operate the toggle member 150 and considering that the toggle member 150 needs to be moved, a slide groove 131 is provided on the handle housing 130.

[0080] In this example, the coupling member 113 is circumferentially positioned by the cooperation between the second positioning protrusion 113 b and the slide groove 131 , thereby preventing the control rod assembly 110 from rotating with the coupling member 113 , thereby avoiding the thrombus removal net 120 from twisting.

[0081] It can be seen that in this example, the slide groove 131 is not only a channel for the toggle member 150 to extend out of the handle housing 130, but also a guide structure for the movement of the toggle member 150 and a circumferential positioning structure for the connecting member 113. One structure has multiple functions without the need to additionally set up structures corresponding to these functions. This achieves a simplified structure of the thrombus removal device 100, a more reasonable structural layout, and reduced processing costs.

[0082] Furthermore, in the embodiment where the connecting member 113 is disposed at the proximal end of the handle housing 130 , the slide groove 131 may pass through to the proximal end of the handle housing 130 , which facilitates one-time processing.

[0083] See also Figures 1 to 10 Some embodiments of the present application also provide a thrombus removal device kit, which includes a sheath assembly 200 and the thrombus removal device 100 mentioned in any of the above schemes, and the insertion portion of the thrombus removal device 100 can be plugged into the sheath assembly 200. In this way, the thrombus removal device kit has the beneficial effects of the above thrombus removal device 100, which will not be repeated.

[0084] In the embodiments provided in the present application, considering the small size of the relevant parts and accessories of the thrombus removal device 100, some set structures can be fixedly connected with the internal plug-in parts by opening holes and injecting glue on the external set parts. Figure 4 As shown, the distal end of the connecting member 113 is provided with a glue injection hole 113d, and glue is injected through the glue injection hole 113d to fix the connecting member 113 and the proximal end of the second rod 112. In this way, the processing cost and the assembly cost can be reduced; in addition, considering the need to limit the entry of air into the blood vessel during the thrombectomy operation, the example can also improve the sealing performance between the suit structures by using the fluidity of the glue by means of glue injection.

[0085] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0086] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A control rod assembly, applied to a thrombus removal device, characterized in that: The control rod assembly comprises a first rod body and a second rod body, wherein: The first rod is coaxially inserted into the second rod, the distal end of the first rod is used to fix the distal end of the thrombus removal net of the thrombus removal device, the distal end of the second rod is used to fix the proximal end of the thrombus removal net, and the first rod and the second rod are movably arranged to drive the thrombus removal net to expand or contract; In the circumferential direction of the control rod assembly, the first rod body is positioned and installed relative to the second rod body to achieve non-rotatable fit between the two.

2. The control lever assembly according to claim 1, characterized in that: The control rod assembly further comprises a connecting piece, and the control rod assembly can be mounted on the handle housing of the thrombus removal device through the connecting piece; The connecting piece is sleeved outside the first rod body and the second rod body. Among the first rod body and the second rod body, one is fixedly connected to the connecting piece, and the other is movably arranged relative to the connecting piece and positioned and matched with the connecting piece in the circumferential direction of the control rod group.

3. The control lever assembly according to claim 2, characterized in that: The connecting piece is a connecting tube, and the control rod group also includes a slider fixedly mounted on the outer circumference of the first rod body or the second rod body. The slider is slidably arranged along the pipeline of the connecting tube, and along the circumference of the control rod group, the slider is positioned and matched with the inner circumference of the connecting tube.

4. The control lever assembly according to claim 3, characterized in that: In the inner circumferential surface of the slider and the connecting tube, one is provided with an arc-shaped protrusion, and the other is provided with an arc-shaped groove, and the slider and the connecting tube are positioned and matched by the arc-shaped protrusion and the arc-shaped groove.

5. The control lever assembly according to any one of claims 2 to 4, characterized in that: The connecting member is fixedly connected to the proximal end of the second rod body, and the proximal end of the first rod body extends out of the proximal end of the connecting member.

6. The control lever assembly according to claim 5, characterized in that: The control rod group also includes a locking structure, which includes a tightening member and an elastic pressure member arranged on the proximal side of the connecting member. The tightening member is sleeved on the first rod body, and the tightening member is detachably connected to the proximal end of the connecting member. When the tightening member is installed on the connecting member, the tightening member can press the elastic pressure member against the first rod body.

7. A thrombus removal device, characterized in that: It comprises a thrombus retrieval net, a handle shell and a control rod group according to any one of claims 1 to 6, wherein the distal end of the thrombus retrieval net is fixedly connected to the first rod body, the distal end of the thrombus retrieval net is fixedly connected to the second rod body, and the first rod body or the second rod body is fixedly mounted on the handle shell.

8. The thrombus removal device according to claim 7, characterized in that: In the case where the control rod assembly includes a connecting piece, the connecting piece is fixedly connected to the second rod body, the proximal end of the first rod body extends out of the proximal end of the connecting piece, and the connecting piece is installed at the proximal end of the handle housing.

9. The thrombus removal device according to claim 8, characterized in that: The thrombus removal device also includes an outer sleeve and a toggle member, wherein the outer sleeve is sleeved on the first rod body and the second rod body, and the toggle member is fixedly connected to the outer sleeve and is used to drive the outer sleeve to move relative to the control rod group; the handle shell is provided with a sliding groove for the toggle member to move, and the connecting member has a second positioning protrusion arranged on its outer circumferential surface, and along the circumference of the thrombus removal device, the second positioning protrusion is positioned and matched with the sliding groove.

10. A thrombus removal device kit, characterized in that: The invention comprises a sheath tube assembly and the thrombus removal device according to any one of claims 7 to 9, wherein the insertion portion of the thrombus removal device can be plugged into and matched with the sheath tube assembly.

Images