Thrombus taking device and thrombus removing device

Abstract

The utility model relates to the technical field of medical instruments, and discloses a thrombus taking device and a thrombus removing device. The thrombectomy device comprises an expandable net, the expandable net has an expanded state and a contracted state; in the expansion state, the maximum radial size position of the expandable net is used for abutting against a blood vessel; a plurality of openings are formed in the near end of the expandable net and are arranged in the axial direction; the opening area of the opening is larger than the area of meshes of the expandable net; the radial size of the collecting cavity of the expandable net is firstly increased and then reduced along the axial direction of the expandable net from near to far, and the hole area of the net holes is gradually reduced; and the total length L of the thrombectomy device is 2-5 times of the maximum radial size D of the collection cavity. The thrombus taking device solves the problems that in the thrombus removing technology of an existing rotary percutaneous mechanical thrombus removing device, the surgical operation difficulty is large, thrombus remaining on the blood vessel wall cannot be treated, and a vena cava filter cannot play a role in intercepting small thrombus and is poor in passing ability in the blood vessel.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a thrombectomy device and a thrombus removal device. Background Art

[0002] When a rotational percutaneous mechanical thrombectomy (PMT) device is used to treat venous thromboembolism, it needs to be used in combination with an inferior vena cava filter and a suction catheter. The inferior vena cava filter is used to collect the thrombus mashed by the rotating device to prevent large-sized thrombus from escaping and entering the pulmonary artery to cause pulmonary embolism (PE); the suction catheter can suck the thrombus mashed by the rotating device out of the body so as to achieve the purpose of blood flow reperfusion.

[0003] Currently, when using a rotational percutaneous mechanical thrombectomy device for surgery, it is necessary to additionally implant an inferior vena cava filter to intercept the fragmented thrombus, which not only increases the difficulty of the surgical operation, but also cannot handle the thrombus remaining on the blood vessel wall. In addition, the current inferior vena cava filter has relatively large mesh holes, and cannot intercept smaller thrombus that escapes due to the inferior vena cava filter, thereby increasing the risk of pulmonary embolism; also due to unreasonable size design, the passability in the blood vessel is poor. Therefore, how to reduce the difficulty of the surgical operation, improve the thrombus removal efficiency of the rotational percutaneous mechanical thrombectomy device, improve the interception ability for smaller thrombus, and improve the passability in the blood vessel are urgent problems to be solved in the industry. Summary of the Utility Model

[0004] The utility model provides a thrombectomy device and a thrombus removal device to solve the problems existing in the current thrombus removal technology of the rotational percutaneous mechanical thrombectomy device, such as the large difficulty of the surgical operation, the inability to handle the thrombus remaining on the blood vessel wall, the inability of the inferior vena cava filter to intercept smaller thrombus, and the poor passability in the blood vessel.

[0005] In the first aspect of the utility model, a thrombectomy device is provided, including:

[0006] An expandable net, having an expanded state and a contracted state; in the expanded state, the maximum radial dimension of the expandable net is used to abut against the blood vessel; a plurality of openings are formed at the proximal end of the expandable net, and the plurality of openings are arranged around the axial direction; the opening area of the openings is larger than the area of the mesh holes of the expandable net; along its own axial direction from near to far, the radial dimension of the collection cavity of the expandable net first increases and then decreases, and the hole area of the mesh holes gradually decreases; the total length L of the thrombectomy device is 2 to 5 times the maximum radial dimension D of the collection cavity.

[0007] According to the thrombectomy device provided by the utility model, the expandable net includes:

[0008] A proximal net bag section, wherein a plurality of openings are provided at the proximal end of the proximal net bag section;

[0009] The distal net bag segment, the proximal end of the distal net bag segment and the distal end of the proximal net bag segment are spliced ​​to form the expandable net; the radial dimension of the collecting chamber at the splicing point of the proximal net bag segment and the distal net bag segment reaches the maximum radial dimension D; the ratio of the length L1 of the proximal net bag segment to the length L2 of the distal net bag segment is 0.75~1.

[0010] According to the thrombus remover provided by the utility model, the expandable net is formed by splicing a plurality of ribs, and the lengths of the ribs on the same circumference are equal; the length of the first rib at the proximal end is 2.5 to 3.5 times the length of the second rib at the proximal end.

[0011] According to the thrombus remover provided by the utility model, the length of the second rib beam at the proximal end to the length of the last rib beam at the distal end forms a geometric progression, and the ratio is 1-1.3.

[0012] According to the thrombus remover provided by the utility model, the width of the rib beam is 0.05mm-0.2mm.

[0013] According to the thrombus remover provided by the utility model, the expandable net further includes:

[0014] H-shaped connecting ribs, the four connecting ends of the H-shaped connecting ribs are respectively connected to the four rib beams, the length L5 of the H-shaped connecting ribs is 0.5 to 1.1 times the width of the rib beams; the width L6 of the H-shaped connecting ribs is 1.3 to 1.6 times the width of the rib beams.

[0015] According to the thrombus remover provided by the utility model, the thrombus remover further includes:

[0016] A proximal hollow tube connected to the proximal end of the expandable net and used for limited cooperation with the spinning guide along the axial direction;

[0017] The distal hollow tube is connected to the distal end of the expandable net and is used for slidingly cooperating with the spinning guide along the axial direction.

[0018] According to the thrombus remover provided by the utility model, the length L3 of the proximal hollow tube is 1 mm to 2 mm; the ratio of the length L3 of the proximal hollow tube to the length L4 of the distal hollow tube is 1.3 to 1.

[0019] According to the thrombus remover provided by the utility model, the expandable net further includes:

[0020] The middle net pocket section, the proximal end and the distal end of the middle net pocket section are respectively spliced and connected to the distal end of the proximal net pocket section and the proximal end of the distal net pocket section to form the expandable net; the radial dimension of the collection cavity of the middle net pocket section reaches the maximum radial dimension D.

[0021] A second aspect of the present invention provides a thrombus removal device, including:

[0022] A rotary percussion guide that can rotate and is used for rotary percussion of thrombus;

[0023] The thrombus extractor according to any one of the above, the thrombus extractor is sleeved outside the rotary percussion guide, the distal end of the rotary percussion guide passes through the distal end of the thrombus extractor, and is axially slidably matched with the distal end of the thrombus extractor; the proximal end of the thrombus extractor is axially limitedly connected to the rotary percussion guide.

[0024] The thrombus extractor provided by the present invention, by connecting the thrombus extractor with a rotary percussion device, can avoid using a vena cava filter and reduce the surgical difficulty. By providing an expandable net having an expanded state and a contracted state, the collection of thrombus can be realized. In the expanded state, the maximum radial dimension of the expandable net is used to abut against the blood vessel, and when the thrombus extractor moves with the rotary percussion device, the thrombus remaining on the blood vessel wall can be processed. By opening a plurality of openings at the proximal end of the expandable net, the plurality of openings are arranged around the axis; the opening area of the openings is larger than the area of the mesh holes, so that the collection of large-sized thrombus can be realized and the thrombus clearance rate can be improved. Along its own axis from near to far, the radial dimension of the collection cavity of the expandable net first increases and then decreases, which is beneficial to pushing or recovering the thrombus extractor from the vascular sheath. Along its own axis from near to far, the pore area of the mesh holes of the expandable net gradually decreases, and the mesh holes at the distal end can realize the collection of small-sized thrombus, avoid the escape of small-sized thrombus, and reduce the risk of pulmonary embolism. By designing the total length L of the thrombus extractor to be 2 to 5 times the maximum radial dimension D of the collection cavity, it can not only meet the collection of thrombus in the case of more thrombus, but also solve the problem of poor passability caused by too long total length. Therefore, the thrombus extractor of this embodiment solves the problems existing in the thrombus removal technology of the existing rotary percutaneous mechanical thrombus removal device, such as large surgical operation difficulty, inability to process the thrombus remaining on the blood vessel wall, the inability of the vena cava filter to intercept smaller thrombus, and poor passability in the blood vessel.

[0025] The thrombus removal device provided by the present invention has at least the above advantages because it has the above thrombus extractor. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is one of the structural schematic diagrams of the first thrombus extractor provided by the present utility model in the expanded state.

[0028] Figure 2 is Figure 1 It is the second structural schematic diagram of the shown thrombus extractor in the expanded state.

[0029] Figure 3 is Figure 1 It is the third structural schematic diagram of the shown thrombus extractor in the expanded state.

[0030] Figure 4 is Figure 1 It is the structural schematic diagram of the shown thrombus extractor in the contracted state.

[0031] Figure 5 It is one of the structural schematic diagrams of the second thrombus extractor provided by the present utility model in the expanded state.

[0032] Figure 6 is Figure 5 It is the second structural schematic diagram of the shown thrombus extractor in the expanded state.

[0033] Figure 7 is Figure 5 It is the third structural schematic diagram of the shown thrombus extractor in the expanded state.

[0034] Figure 8 It is the structural schematic diagram of the thrombus removal device provided by the present utility model.

[0035] Figure 9 is Figure 8 It is one of the structural schematic diagrams of the shown thrombus removal device in the blood vessel.

[0036] Figure 10 is Figure 8 It is the second structural schematic diagram of the shown thrombus removal device in the blood vessel.

[0037] Reference numerals:

[0038] 10, blood vessel wall; 20, thrombus;

[0039] 100. Thrombectomy device; 110. Expandable net; 120. Proximal hollow tube; 130. Distal hollow tube; 140. Imaging component; 111. Proximal net pocket section; 112. Middle net pocket section; 113. Distal net pocket section; 114. Rib beam; 115. H-shaped connecting rib; 116. Imaging hole; 121. First connecting protrusion; 122. Second connecting protrusion; 131. Third connecting protrusion;

[0040] 200. Rotary drilling guide; 210. Rotary cutting part. Detailed implementation manner

[0041] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0042] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0044] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] As Figures 1 to 4 shown, a specific embodiment of the first aspect of the present utility model provides a thrombectomy device 100. The thrombectomy device 100 includes an expandable mesh 110; the expandable mesh 110 has an expanded state and a contracted state; in the expanded state, the maximum radial dimension of the expandable mesh 110 is used to abut against a blood vessel; a plurality of openings are formed at the proximal end of the expandable mesh 110, and the plurality of openings are arranged around the axis; the opening area of the openings is larger than the area of the mesh holes; along its own axis from near to far, the radial dimension of the collection cavity of the expandable mesh 110 first increases and then decreases, and the hole area of the mesh holes of the expandable mesh 110 gradually decreases; the total length L of the thrombectomy device 100 is 2 to 5 times the maximum radial dimension D of the collection cavity.

[0047] In this embodiment, by connecting the thrombectomy device to the rotary drilling device, the use of inferior vena cava filters can be avoided, reducing the surgical difficulty. By providing the expandable mesh 110 having an expanded state and a contracted state, collection of the thrombus 20 can be achieved. In the expanded state, the maximum radial dimension of the expandable mesh 110 is used to abut against the blood vessel, and when the thrombectomy device moves with the rotary drilling device, treatment of the thrombus remaining on the blood vessel wall can be achieved. By providing a plurality of openings at the proximal end of the expandable mesh 110, the plurality of openings are arranged around the axis; the opening area of the openings is larger than the area of the mesh holes, so that collection of large-sized thrombi 20 can be achieved, and the thrombus 20 clearance rate can be increased. Along its own axis from near to far, the radial dimension of the collection cavity of the expandable mesh 110 first increases and then decreases, which is beneficial to the pushing out or recovery of the thrombectomy device 100. Along its own axis from near to far, the pore area of the mesh holes of the expandable mesh 110 gradually decreases, and the mesh holes at the distal end can achieve collection of small-sized thrombi 20, avoiding escape of small-sized thrombi 20 and reducing the risk of pulmonary embolism. By designing the total length L of the thrombectomy device 100 to be 2 to 5 times the maximum radial dimension D of the collection cavity, both collection of the thrombus 20 in the case of a large amount of thrombus 20 can be satisfied, and the problem of poor passability caused by too long total length can be avoided. Therefore, the thrombectomy device of this embodiment solves the problems in the existing thrombus removal technology of rotary percutaneous mechanical thrombectomy devices, such as large surgical operation difficulty, inability to treat the thrombus remaining on the blood vessel wall, inability of inferior vena cava filters to intercept smaller thrombi, and poor passability in the blood vessel.

[0048] It can be understood that from near to far refers to from the proximal end of the thrombectomy device 100 to the distal end of the thrombectomy device 100. The proximal end refers to the end close to the operator, and the distal end refers to the end far from the operator.

[0049] Further, four openings are formed at the proximal end of the expandable mesh 110, and the four openings are arranged around the axis.

[0050] Preferably, the four openings are evenly arranged around the axis. The shapes of two adjacent openings may be the same or different. The two opposite openings are axisymmetric about the central axis of the thrombectomy device 100, and the shapes of the two opposite openings may be the same.

[0051] It can be understood that the total length of the thrombectomy device 100 refers to the dimension of the thrombectomy device 100 in its own axial direction.

[0052] Further, the mesh holes gradually become smaller and close from near to far. In other words, the mesh holes are not circular, the radial dimension of each mesh hole first increases and then decreases from near to far, and the pore area of the mesh holes from near to far shows a gradually decreasing trend.

[0053] Such as Figure 1As shown, specifically, the pore areas of the pores on the same circumference are the same. Along the axial direction from near to far, the perimeter of the last pore 101 at the distal end is generally less than 3 mm. Preferably, the perimeter of the last pore 101 at the distal end is 0.3 - 0.5 mm, so that more small-sized thrombi 20 can be intercepted, further reducing the probability of pulmonary embolism.

[0054] As Figure 1 shown, it should be noted that the area of the pore 102 at the maximum radial dimension of the collection net is the largest.

[0055] As Figure 9 and Figure 10 shown, it can be understood that at the maximum radial dimension of the collection cavity, the expandable net 110 abuts against the blood vessel wall 10. When the thrombus extractor 100 is retracted, the expandable net 110 can shear off the thrombus 20 adhering to the blood vessel wall 10, and the sheared-off thrombus 20 is collected by the expandable net 110 and removed from the body.

[0056] As Figure 1 shown, in some embodiments, the thrombus extractor 100 further includes a proximal hollow tube 120 and a distal hollow tube 130. The proximal hollow tube 120 is connected to the proximal end of the expandable net 110 and is used for axially limiting and cooperating with the rotary guide 200. The distal hollow tube 130 is connected to the distal end of the expandable net 110 and is used for axially sliding and cooperating with the rotary guide 200.

[0057] In this embodiment, by providing the proximal hollow tube 120 that axially limits and cooperates with the rotary guide 200, and by providing the distal hollow tube 130 that axially slides and cooperates with the rotary guide 200, during the thrombus removal operation, the thrombus extractor 100 of this embodiment can be implanted into the body together with the rotary guide 200, without having to implant the thrombus extractor 100 into the body in advance and then implant the rotary device into the body, simplifying the surgical procedure, reducing the surgical difficulty, shortening the surgical time, and reducing the probability of complications.

[0058] As Figure 1 shown, further, the length L3 of the proximal hollow tube 120 is 1 mm - 2 mm; the ratio of the length L3 of the proximal hollow tube 120 to the length L4 of the distal hollow tube 130 is 1.3 - 1. This can prevent the hollow tubes from occupying too much of the total length of the thrombus extractor 100, enabling the thrombus extractor 100 to pass through curved blood vessels more smoothly and improving the bending ability of the thrombus extractor 100.

[0059] As Figure 1As shown, in some embodiments, the expandable net 110 includes a proximal net pocket section 111 and a distal net pocket section 113. The proximal net pocket section 111 refers to a section of the expandable net 110 close to the proximal end of the thrombectomy device 100, and the distal net pocket section 113 refers to a section of the expandable net 110 close to the distal end of the thrombectomy device 100. Specifically, the proximal net pocket section 111 refers to a section of the expandable net 110 connected to the proximal hollow tube 120, and the distal net pocket section 113 refers to a section of the expandable net 110 connected to the distal hollow tube 130.

[0060] A plurality of openings are provided at the proximal end of the proximal net pocket section 111. The proximal end of the distal net pocket section 113 is spliced with the distal end of the proximal net pocket section 111 to form the expandable net 110; the radial dimension of the collection cavity at the splicing position of the proximal net pocket section 111 and the distal net pocket section 113 reaches the maximum radial dimension D, as Figure 2 shown; the ratio of the length L1 of the proximal net pocket section 111 to the length L2 of the distal net pocket section 113 is 0.75 to 1.

[0061] In this embodiment, by defining a section of the expandable net 110 between the proximal end of the thrombectomy device 100 and the maximum radial dimension of the collection cavity as the proximal net pocket section 111, and defining a section of the expandable net 110 between the distal end of the thrombectomy device 100 and the maximum radial dimension of the collection cavity as the distal net pocket section 113, and limiting the ratio of the length of the proximal net pocket section 111 to the length of the distal net pocket section 113 to be 0.75 to 1, the smoothness of the retrieval and pushing of the thrombectomy device 100 can be further improved, which is beneficial to the retrieval and pushing of the thrombectomy device 100.

[0062] Preferably, the ratio of the length L1 of the proximal net pocket section 111 to the length L2 of the distal net pocket section 113 is 0.75.

[0063] As Figure 1 and Figure 3 shown, specifically, the proximal end of the proximal net pocket section 111 is connected to the distal side surface of the proximal hollow tube 120, the proximal end of the distal net pocket section 113 is spliced with the distal end of the proximal net pocket section 111 to form the expandable net 110, and the distal end of the distal net pocket section 113 is connected to the proximal side surface of the distal hollow tube 130. At this time, the distance between the proximal side surface of the proximal hollow tube 120 and the distal side surface of the distal hollow tube 130 is the total length L of the thrombectomy device 100.

[0064] It can be understood that the mesh density of the proximal net pocket section 111 is less than that of the distal net pocket section 113, ensuring that the pore area of the mesh of the proximal net pocket section 111 is larger than that of the mesh of the distal net pocket section 113, and realizing the collection of thrombi 20 of different sizes in the direction from near to far, thereby improving the thrombus 20 clearance rate.

[0065] As Figure 4As shown, in some embodiments, the expandable net 110 pocket is formed by splicing a plurality of rib beams 114. The lengths of the rib beams 114 on the same circumference are equal; the length of the first rib beam 114 at the proximal end is 2.5 to 3.5 times the length of the second rib beam 114 at the proximal end. This design is beneficial to the retraction of the thrombectomy device 100. In addition, without affecting the forming conditions of the distal mesh holes of the thrombectomy device 100, the opening of the proximal net pocket section 111 can be ensured to have the optimal size, which is beneficial for the thrombus 20 to flow into the collection cavity from the opening.

[0066] As Figure 4 shown, preferably, the length of the first rib beam 114 at the proximal end is 2 times the length of the second rib beam 114 at the proximal end.

[0067] Furthermore, the lengths of the second rib beam 114 at the proximal end to the last rib beam 114 at the distal end form a geometric progression, and the ratio is 1 to 1.3. This design ensures that the mesh holes with a circumference less than 3 mm can be formed at the distal end of the thrombectomy device 100, and at the same time, the total length L is shortened as much as possible, which is beneficial for the thrombectomy device 100 to be pushed to the lesion location.

[0068] Preferably, the lengths of the second rib beam 114 at the proximal end to the last rib beam 114 at the distal end form a geometric progression, and the ratio is 1.

[0069] Furthermore, the width of the rib beam 114 is 0.05 mm to 0.2 mm. It can not only ensure that the thrombectomy device 100 has sufficient acting force on the blood vessel wall 10 and can shear off the thrombus 20 adhered to the blood vessel wall 10, but also ensure that the thrombectomy device 100 has good passability. If the width of the rib beam 114 is greater than 0.2 mm, the contact area between the rib beam 114 and the blood vessel 10 is relatively large, and then the acting force of the rib beam 114 on the blood vessel wall 10 is relatively large, which may lead to poor passability of the thrombectomy device 100 in the blood vessel 10 and affect the retraction and pushing of the thrombectomy device 100. If the width of the rib beam 114 is less than 0.05 mm, although the thrombectomy device 100 can smoothly pass through the blood vessel 10, due to the small acting force between the thrombectomy device 100 and the blood vessel wall 10, there may be a problem that the thrombus 20 adhered to the blood vessel wall 10 cannot be sheared off.

[0070] Preferably, the width of the rib beam 114 is 0.1 mm.

[0071] As Figures 1 to 4As shown, the inflatable net 110 pocket further includes an H-shaped connecting rib 115; the four connecting ends of the H-shaped connecting rib 115 are respectively connected to the four rib beams 114, and the length L5 of the H-shaped connecting rib 115 is 0.5 to 1.1 times the width of the rib beam 114; the width L6 of the H-shaped connecting rib 115 is 1.3 to 1.6 times the width of the rib beam 114. Defining the width L6 of the H-shaped connecting rib 115 to be 1.3 to 1.6 times the width of the rib beam 114 can ensure the stress intensity of the H-shaped connecting rib 115 and avoid the H-shaped connecting rib 115 from breaking at the middle groove. Defining the length L5 of the H-shaped connecting rib 115 to be 0.5 to 1.1 times the width of the rib beam 114 can ensure the overall flexibility of the inflatable net 110 and ensure that the inflatable net 110 can smoothly switch between the inflated state and the contracted state. If the length L5 of the H-shaped connecting rib 115 is less than 0.5 times the width of the rib beam 114, the inflatable net 110 will be too flexible, which is not conducive to maintaining the shape and even unable to collect the thrombus 20. If the length L5 of the H-shaped connecting rib 115 is greater than 1.1 times the width of the rib beam 114, the flexibility of the inflatable net 110 will be too poor, resulting in poor passability of the thrombectomy device 100 in the blood vessel.

[0072] Preferably, the length L5 of the H-shaped connecting rib 115 is 0.8 times the width of the rib beam 114; the width L6 of the H-shaped connecting rib 115 is 1.3 times the width of the rib beam 114.

[0073] As Figure 1 、 Figure 3 and Figure 4 shown, specifically, the rib beam 114 includes a first rib beam 1, a second rib beam 2, a third rib beam 3, a fourth rib beam 4, a fifth rib beam 5, a sixth rib beam 6, a seventh rib beam 7, and an eighth rib beam 8 that are sequentially connected along the axial direction from near to far. The first rib beam 1, the second rib beam 2, and the third rib beam 3 are connected to form a proximal pocket section 111; the fourth rib beam 4, the fifth rib beam 5, the sixth rib beam 6, the seventh rib beam 7, and the eighth rib beam 8 are connected to form a distal pocket section 113. The length of the first rib beam 1 is 2.5 - 3.5 times the length of the second rib beam 2, preferably 3 times, and the lengths of the second rib beam 2, the third rib beam 3, the fourth rib beam 4, the fifth rib beam 5, the sixth rib beam 6, the seventh rib beam 7, and the eighth rib beam 8 form a geometric sequence with a ratio of 1 to 1.3, preferably 1.

[0074] As Figure 1 、 Figure 3 and Figure 4As shown, specifically, the distal end of the proximal hollow tube 120 is provided with a first connection protrusion 121 and a second connection protrusion 122. The first connection protrusion 121 and the second connection protrusion 122 are symmetrically arranged with respect to the central axis of the proximal hollow tube 120. The first connection protrusion 121 has two first connection ends, and the second connection protrusion 122 has two second connection ends. The first connection ends and the second connection ends are respectively connected to a first rib beam 114. As Figure 3 and Figure 4 shown, a first opening 103 is formed between two first rib beams 1 connected to the same connection protrusion. The two first openings 103 have the same shape and are symmetric with respect to the central axis of the proximal hollow tube 120. As Figure 1 and Figure 4 shown, a second opening 104 is formed between two adjacent first rib beams 1 respectively connected to the first connection end and the second connection end. The two second openings 104 have the same shape and are symmetric with respect to the central axis of the proximal hollow tube 120.

[0075] Preferably, the shapes of the first opening 103 and the second opening 104 may be different, so that thrombi 20 of different shapes and sizes can quickly enter the collection cavity, improving the thrombus 20 clearance rate.

[0076] As Figure 1 、 Figure 3 and Figure 4 shown, specifically, the distal hollow tube 130 is provided with a plurality of third connection protrusions 131. The plurality of third connection protrusions 131 are arranged around the central axis of the distal hollow tube 130. Each third connection protrusion 131 is connected to the distal ends of two eighth rib beams 8, closing the distal end of the thrombectomy device 100.

[0077] It can be understood that the number of the third connection protrusions 131 is at least 6.

[0078] As Figures 1 to 7 shown, in some embodiments, a plurality of imaging holes 116 are formed at the maximum radial dimension of the collection cavity of the expandable mesh 110. The plurality of imaging holes 116 are evenly distributed on the circumference of the expandable mesh 110. An imaging component 140 is disposed in the imaging hole 116. As Figure 4 shown, the doctor can determine whether the thrombectomy device 100 is closely attached to the blood vessel wall 10 according to the position of the imaging component 140.

[0079] Furthermore, the shape of the imaging hole 116 can be circular, keyway or I-shaped. Preferably, the shape of the imaging hole 116 is circular.

[0080] Specifically, the number of the imaging holes 116 is four, and the four imaging holes 116 are respectively opened in the middle of the H-shaped connecting rib 115.

[0081] AsFigures 5 to 7 As shown, in some other embodiments, the expandable net 110 further includes a middle net pocket section 112. The proximal end and the distal end of the middle net pocket section 112 are respectively spliced and connected to the distal end of the proximal net pocket section 111 and the proximal end of the distal net pocket section 113 to form the expandable net 110; the radial dimension of the collection cavity of the middle net pocket section 112 reaches the maximum radial dimension D. By providing the middle net pocket section 112, the capacity of the thrombectomy device 100 can be increased, so that the thrombectomy device 100 can accommodate more thrombi 20.

[0082] As Figure 5 shown, further, the length L7 of the middle net pocket section 112 is 1 to 4 times the length L1 of the proximal net pocket section 111. It can be specifically selected according to clinical needs.

[0083] As Figure 5 and Figure 7 shown, further, the middle net pocket section 112 is formed by sequentially connecting a plurality of ninth rib beams 9, and the length of the ninth rib beam 9 is equal to the length of the third rib beam 3.

[0084] As Figure 5 and Figure 7 shown, further, both the proximal end and the distal end of the middle net pocket section 112 are provided with imaging holes 116. Preferably, four imaging holes 116 are opened at the proximal end of the middle net pocket section 112; the four imaging holes 116 at the proximal end are evenly arranged on the proximal circumference of the middle net pocket section 112. Four imaging holes 116 are opened at the distal end of the middle net pocket section 112; the four imaging holes 116 at the distal end are evenly arranged on the distal circumference of the middle net pocket section 112. The imaging holes 116 at the proximal end and the corresponding imaging holes 116 at the distal end are on the same axis.

[0085] Specifically, the imaging holes 116 at the proximal end are opened in the H-shaped connecting rib 115 between the first ninth rib beam 9 and the third rib beam 3 at the proximal end. The imaging holes 116 at the distal end are opened in the H-shaped connecting rib 115 between the last ninth rib beam 9 and the fourth rib beam 4 at the distal end.

[0086] As Figures 8 to 10 shown, a specific embodiment of the second aspect of the present invention provides a thrombus 20 removal device. The thrombus 20 removal device includes a rotary guide 200 and the thrombectomy device 100 of any of the above embodiments. The rotary guide 200 can rotate and is used to rotary cut the thrombus 20. The thrombectomy device 100 is sleeved outside the rotary guide 200, and the distal end of the rotary guide 200 passes through the distal end of the thrombectomy device 100 and is axially slidably matched with the distal end of the thrombectomy device 100; the proximal end of the thrombectomy device 100 is axially limitedly connected to the rotary guide 200.

[0087] In this embodiment, since the thrombectomy device 100 of any of the above embodiments is adopted, it has at least the above advantages and will not be elaborated here.

[0088] Further, the distal end of the thrombectomy device 100 is in axial sliding fit; the proximal end of the thrombectomy device 100 is axially limitedly connected to the rotary drilling guide 200. The thrombectomy device 100 can be pushed to the lesion together with the rotary drilling guide 200 or can be withdrawn to the outside of the body together.

[0089] In addition, in this embodiment, because the proximal end of the thrombectomy device 100 is axially limitedly connected to the rotary drilling guide 200 and the distal end of the thrombectomy device 100 is in axial sliding fit with the rotary drilling guide 200, during the thrombectomy operation, the thrombectomy device 100 of this embodiment can be implanted into the body together with the rotary drilling guide 200 without implanting the thrombectomy device 100 into the body in advance and then implanting the rotary drilling device into the body, which simplifies the surgical steps, reduces the surgical difficulty, shortens the surgical time, and can reduce the probability of complications.

[0090] It can be understood that the rotary drilling device may include the rotary drilling guide 200.

[0091] Specifically, the proximal hollow tube 120 of the thrombectomy device 100 is in axial limited fit with the rotary drilling guide 200. The distal hollow tube 130 of the thrombectomy device 100 is in axial sliding fit with the rotary drilling guide 200.

[0092] As Figure 8 shown, in some embodiments, the rotary drilling guide 200 includes a guide wire. The distal end of the guide wire sequentially passes through the proximal hollow tube 120, the collection cavity and the distal hollow tube 130 and exits from the distal hollow tube 130. The guide wire can rotate freely relative to the thrombectomy device 100. The proximal hollow tube 120 is axially limited with the guide wire, and the distal hollow tube 130 is in axial sliding fit with the guide wire. The guide wire has a rotary cutting portion 210. The rotary cutting portion 210 is located between the proximal end of the thrombectomy device 100 and the proximal end of the guide wire and is close to the proximal end of the thrombectomy device 100. The rotary cutting portion 210 has a rotary cutting state and a retracted state; when the guide wire is pushed to the lesion position, the rotary cutting portion 210 is in the rotary cutting state to realize rotary cutting of the thrombus 20; when the guide wire is withdrawn, the rotary cutting portion 210 is in the retracted state. That is to say, the rotary cutting portion 210 of the guide wire can switch between the rotary cutting state and the retracted state according to the pushing and withdrawing.

[0093] It can be understood that the thrombus removing device 20 further includes a vascular sheath; the vascular sheath is sleeved outside the guide wire and forms a receiving space with the guide wire, and the receiving space is used to receive the thrombectomy device 100.

[0094] When the thrombus removal device 20 is pushed into the body, the guide wire drives the thrombectomy device 100 to be pushed towards the lesion location. After the thrombectomy device 100 leaves the accommodation space, it automatically switches from the contracted state to the expanded state, and the maximum radial dimension of the thrombectomy device 100 abuts against the blood vessel wall 10. At the same time, the rotary cutting part 210 of the guide wire switches from the retracted state to the rotary cutting state. When the rotary cutting part 210 is pushed to the lesion location, the thrombus removal device 20 is activated, and the guide wire starts to rotate to achieve rotary cutting of the thrombus 20, as Figure 9 shown. When the thrombus removal device 20 is retracted, the guide wire drives the thrombectomy device 100 away from the lesion location. During the retraction process, the thrombectomy device 100 shears the thrombus 20 adhered to the blood vessel wall 10, as Figure 10 shown, to achieve the removal of the adherent thrombus 20 until the thrombectomy device 100 is pressed into the accommodation space, and the thrombectomy device 100 switches from the expanded state to the contracted state, and the rotary cutting part 210 of the guide wire switches from the rotary cutting state to the retracted state.

[0095] Furthermore, the rotary cutting part 210 is an alloy guide wire with shape memory.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thrombus remover, characterized in that: include: The expandable net (110) has an expanded state and a contracted state; in the expanded state, the maximum radial dimension of the expandable net (110) is used to abut against the blood vessel; a plurality of openings are formed at the proximal end of the expandable net (110), and the plurality of openings are arranged around the axial direction; the opening area of ​​the openings is larger than the area of ​​the mesh of the expandable net (110); from near to far along its own axial direction, the radial dimension of the collection cavity of the expandable net (110) first increases and then decreases, and the hole area of ​​the mesh gradually decreases; the total length L of the thrombus remover (100) is 2 to 5 times the maximum radial dimension D of the collection cavity.

2. The thrombus remover according to claim 1, characterized in that: The expandable net (110) comprises: A proximal net bag section (111), wherein a plurality of openings are provided at the proximal end of the proximal net bag section (111); A distal net bag section (113), wherein the proximal end of the distal net bag section (113) and the distal end of the proximal net bag section (111) are spliced ​​together to form the expandable net (110); the radial dimension of the collecting chamber at the splicing point of the proximal net bag section (111) and the distal net bag section (113) reaches a maximum radial dimension D; and the ratio of the length L1 of the proximal net bag section (111) to the length L2 of the distal net bag section (113) is 0.75-1.

3. The thrombus remover according to claim 2, characterized in that: The expandable net (110) is formed by splicing a plurality of rib beams (114), wherein the lengths of the rib beams (114) on the same circumference are equal; the length of the first rib beam (114) at the proximal end is 2.5 to 3.5 times the length of the second rib beam (114) at the proximal end.

4. The thrombus remover according to claim 3, characterized in that: The length of the second rib beam (114) at the proximal end to the length of the last rib beam (114) at the distal end forms a geometric progression, with a ratio of 1 to 1.

3.

5. The thrombus remover according to claim 4, characterized in that: The rib beam (114) has a width of 0.05 mm to 0.2 mm.

6. The thrombus remover according to claim 5, characterized in that: The expandable net (110) further comprises: An H-shaped connecting rib (115), wherein four connecting ends of the H-shaped connecting rib (115) are respectively connected to four rib beams (114); a length L5 of the H-shaped connecting rib (115) is 0.5 to 1.1 times the width of the rib beam (114); and a width L6 of the H-shaped connecting rib (115) is 1.3 to 1.6 times the width of the rib beam (114).

7. The thrombus remover according to claim 1, characterized in that: The thrombus remover (100) further comprises: A proximal hollow tube (120) connected to the proximal end of the expandable net (110) and used for limited cooperation with the spinning guide (200) along the axial direction; The distal hollow tube (130) is connected to the distal end of the expandable net (110) and is used to slide with the spinning guide (200) along the axial direction.

8. The thrombus remover according to claim 7, characterized in that: The length L3 of the proximal hollow tube (120) is 1 mm to 2 mm; and the ratio of the length L3 of the proximal hollow tube (120) to the length L4 of the distal hollow tube (130) is 1.3 to 1.

9. The thrombus remover according to any one of claims 2 to 6, characterized in that: The expandable net (110) further comprises: A middle net bag section (112), wherein the proximal end and the distal end of the middle net bag section (112) are respectively spliced ​​and connected to the distal end of the proximal net bag section (111) and the proximal end of the distal net bag section (113) to form the expandable net (110); the radial dimension of the collection cavity of the middle net bag section (112) reaches a maximum radial dimension D.

10. A thrombus removal device, characterized in that: include: A thrombus-beating guide (200) capable of rotating and used for thrombus-beating (20); The thrombus remover (100) according to any one of claims 1 to 9, wherein the thrombus remover (100) is sleeved on the outside of the rotary guide (200), the distal end of the rotary guide (200) passes through the distal end of the thrombus remover (100) and is axially slidably matched with the distal end of the thrombus remover (100); the proximal end of the thrombus remover (100) is axially limitedly connected to the rotary guide (200).

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