Thrombus aspiration device and pusher

Abstract

The present invention provides a thrombus aspiration device and a pusher. The thrombus aspiration device comprises: an aspiration sheath and an aspiration funnel; the aspiration funnel comprises: a funnel support and a coating; the funnel support is an expandable and contractible funnel-shaped support structure with a large distal opening and a small proximal opening; the proximal end of the funnel support is connected to the distal end of the aspiration sheath; the coating is coated on the funnel support. The embodiment of the present invention allows the aspiration sheath to be centrally aspirated through the support of the aspiration funnel, and can expand the aspiration port, improve the aspiration efficiency, reduce blood loss, and is easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus aspiration device and a pusher. Background Art

[0002] Vascular disease has become an important factor affecting human health, and interventional thrombectomy is currently a research hotspot in the field of thrombus treatment.

[0003] Aspiration and thrombectomy has become increasingly common in clinical applications in recent years. However, due to the complexity of vascular anatomy, current aspiration catheters often cling to one side of the blood vessel wall during aspiration, resulting in poor aspiration effects, large blood loss during the aspiration process, and the risk of damaging the blood vessel wall. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a thrombus aspiration device and a pusher to solve the problems of low aspiration efficiency, large blood loss and easy damage to the blood vessel wall.

[0005] To solve the above technical problems, according to one aspect of the present invention, an embodiment of the present invention provides a thrombus aspiration device, including: an aspiration sheath and a suction funnel;

[0006] The suction funnel comprises: a funnel support and a covering film;

[0007] The funnel stent is an expandable and contractible funnel-shaped stent structure with a large distal opening and a small proximal opening; the proximal end of the funnel stent is connected to the distal end of the suction sheath;

[0008] The coating is coated on the funnel support.

[0009] In addition, a plurality of through holes are arranged on the peripheral wall of the suction funnel.

[0010] In addition, the funnel support comprises: a plurality of support bars and a connecting ring;

[0011] The connecting ring is fixedly arranged at the proximal end of the suction sheath, the proximal ends of the plurality of support strips are connected to the connecting ring, the plurality of support strips are evenly spaced circumferentially arranged around the center of the connecting ring and form a funnel-shaped support skeleton extending from the proximal end to the distal end; the coating is fixedly arranged on the support skeleton.

[0012] In addition, the support bar includes: an axial support bar whose proximal end is connected to the connecting ring and a circumferential support bar vertically connected to the distal end of the axial support bar;

[0013] The circumferential support bars of the plurality of support bars are circumferentially aligned.

[0014] In addition, the axial support strip is connected to the connecting ring in an arc shape, and the axial support strip is connected to the circumferential support strip in an arc shape.

[0015] In addition, the plurality of through holes include a plurality of through hole groups opened on the coating between any two adjacent support strips; each of the through hole groups includes a plurality of through holes; the through holes in the plurality of through hole groups are circumferentially aligned, and the area of ​​each through hole in each of the through hole groups increases with the increase of the distance between the support strips on both sides.

[0016] In addition, the coating is made of the following materials: polyethylene, ultra-high molecular weight polyethylene, polyester, nylon or polyurethane.

[0017] In addition, the funnel bracket is made of memory metal pipe by laser engraving.

[0018] In addition, the suction sheath comprises a sheath body and a sheath handle;

[0019] The sheath handle is used to control the distal end of the sheath body to bend toward the proximal end.

[0020] According to another aspect of the present invention, an embodiment of the present invention provides a pusher, which can be used in conjunction with the aforementioned thrombus aspiration device. The pusher can be inserted into the aspiration sheath of the thrombus aspiration device and is used to transport and release the aspiration funnel disposed at the distal end of the aspiration sheath; the pusher includes:

[0021] A push head having an annular cavity with an opening toward the proximal end and used for accommodating the suction funnel in a compressed state;

[0022] A push rod, the distal end of which is connected to the proximal end of the push head, the push rod and the push head can be inserted into the suction sheath tube and can move axially relative to the suction sheath tube; and

[0023] A drive assembly, the distal end of which is connected to the proximal end of the suction sheath, is fixedly connected to the push rod and is used to drive the push rod to move distally in the suction sheath to release the suction funnel.

[0024] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0025] In the thrombus aspiration device of the embodiment of the present invention, a suction funnel is provided at the distal end of the aspiration sheath, and the suction funnel is an expandable funnel-shaped stent structure. Therefore, after the suction funnel is released, it can support the inner wall of the blood vessel at the tube mouth of the suction sheath, so that the tube mouth of the suction sheath is centered and will not be close to one side of the blood vessel wall, thereby avoiding damage to the inner wall of the blood vessel. At the same time, the suction funnel can also provide a larger thrombus aspiration port, thereby improving the aspiration efficiency and reducing blood loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It can be understood that the drawings in the following description are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a thrombus aspiration device provided in Embodiment 1 of the present invention;

[0028] Figure 2 A schematic diagram of the structure of the suction funnel of the thrombus suction device provided in the first embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of a thrombus aspiration device provided in Embodiment 2 of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a pusher provided in Embodiment 3 of the present invention;

[0031] Figure 5 for Figure 4 Schematic diagram of the local cross-sectional structure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0033] In the description of the present application, the orientations or positional relationships indicated by the terms such as "center", "up", "down", "inside", and "outside" are based on the orientations or positional relationships shown in the drawings and are only for the convenience of description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0034] Unless otherwise specified, the proximal end and distal end mentioned in the present invention have the same meaning in terms of direction, that is, in use, the distal end is the end away from the operator, and the proximal end is the end close to the operator, and the operator controls the thrombus aspiration device at the proximal end.

[0035] See also Figure 1-2 As shown, an embodiment of the present invention provides a thrombus aspiration device, which can be used for aspirating thrombus in a blood vessel.

[0036] like Figure 1 As shown, the thrombus suction device of this embodiment includes: a suction sheath 2 and a suction funnel 1. The suction funnel 1 includes: a funnel stent and a coating 11. The proximal end of the funnel stent is connected to the distal end of the suction sheath 2. The funnel stent is an expandable and contractible funnel-shaped stent structure with a large distal opening and a small proximal opening. The coating 11 is coated on the funnel stent and forms a funnel-shaped suction structure together with the funnel stent.

[0037] When the thrombus suction device reaches the thrombus suction position, the suction funnel is released and the funnel stent can expand, driving the coating 11 to open to form a suction funnel. The self-expansion performance of the funnel stent can be formed by using a memory material. At this time, the suction funnel can be fully opened and attached to the inner wall of the blood vessel. The suction funnel is a hollow structure similar to a cone, and can have a trumpet-shaped suction port, that is, the distal opening of the suction funnel is larger than the tube mouth of the suction sheath, so that the distal end of the suction sheath is centered in the blood vessel, and will not be close to one side of the blood vessel wall; in addition, the trumpet-shaped suction port can also expand the thrombus suction inlet, improve the efficiency of thrombus suction, and reduce blood loss.

[0038] like Figure 2 As shown, the funnel support may include: a plurality of support bars 13 and a connecting ring 12. The connecting ring 12 is fixed to the proximal end of the suction sheath 2, and the proximal ends of the plurality of support bars 13 are connected to the connecting ring 12. The plurality of support bars 13 are evenly spaced around the center of the connecting ring 12 and form a funnel-shaped support skeleton extending from the proximal end to the distal end, and the coating 11 is fixed on the support skeleton. Each support bar 13 can be fixed to the surface of the coating 11 by heat pressing or the like, and the coating 11 is supported by a plurality of support bars 13, so that the suction funnel can be unfolded into a funnel-shaped structure when in use, that is, a hollow structure similar to a frustum with a large distal end and a small proximal end.

[0039] Furthermore, the support bar 13 may include: an axial support bar 131 connected to the connecting ring 12 at the proximal end and a circumferential support bar 132 vertically connected to the distal end of the axial support bar 131. The axial support bar 131 can expand and contract radially. The circumferential support bars 132 of several support bars 13 are aligned circumferentially, so as to support the coating at the distal end of the suction funnel, so that the suction funnel has an annular suction port, better adheres to the blood vessel, and is convenient for complete suction of thrombus. Among them, the axial support bar 131 is connected to the connecting ring 12 in an arc shape, and the axial support bar 131 is connected to the circumferential support bar 132 in an arc shape.

[0040] It should be noted that the funnel stent can be made of a memory metal tube by laser engraving, and the memory metal is preferably nickel-titanium alloy. It is understandable that the funnel stent can also be made of braided metal wire. No specific limitation is made here.

[0041] The coating 11 can be made by weaving, spinning or extruding silk threads, and the materials of the coating include but are not limited to polyethylene, ultra-high molecular weight polyethylene, polyester, nylon and polyurethane.

[0042] In some examples, a plurality of through holes 14 may be provided on the peripheral wall of the suction funnel 2. The blood vessel at the suction position is connected to the inner cavity of the suction funnel 1 through the plurality of through holes 14, and the inner wall of the blood vessel can be attached to the surface of the suction funnel 1 during the suction process, so as to avoid the pressure difference between the blood vessel and the suction funnel 1 when the blood vessel and the suction funnel 1 are not connected, causing the coating 11 to be compressed and deformed, affecting the suction of thrombus, and at the same time, blocking the blood flow of the non-suctioned blood vessel segment from entering the suction sheath.

[0043] Specifically, the plurality of through holes may include a plurality of through hole groups opened on the coating 11 between any two adjacent support strips 13. Each through hole group may include a plurality of through holes 14. Among them, the through holes 14 in the plurality of through hole groups are circumferentially aligned, and the area of ​​each through hole 14 in each through hole group increases with the increase of the distance between the support strips 13 on both sides, so that the blood vessel wall can be more evenly attached to the outer surface of the suction funnel 1. Exemplarily, the through hole 1 can be a round through hole, an elliptical through hole, etc. It can be understood that the present embodiment does not impose specific restrictions on the number, shape, and size of the through holes in each through hole group, as long as it is conducive to protecting the blood vessel wall and avoiding the influence of the coating on the suction effect.

[0044] Compared with the prior art, the thrombus aspiration device of the embodiment of the present invention is provided with a suction funnel at the distal end of the aspiration sheath, and the suction funnel is an expandable funnel-shaped stent structure. Therefore, after the suction funnel is released, it can support the inner wall of the blood vessel at the tube mouth of the suction sheath, so that the tube mouth of the suction sheath is centered and will not be close to one side of the blood vessel wall, thereby avoiding damage to the inner wall of the blood vessel. At the same time, the suction funnel can also provide a larger thrombus aspiration port, thereby improving the aspiration efficiency and reducing the amount of blood loss.

[0045] See also Figure 3 , Embodiment 2 of the present invention provides a thrombus aspiration device. The thrombus aspiration device of this embodiment is basically the same as the thrombus aspiration device of Embodiment 1, and the main difference is that the aspiration sheath tube of the thrombus aspiration device of this embodiment is an adjustable bending sheath tube. The difference between the two is described below, and the similarities between the two are not repeated.

[0046] like Figure 3 As shown, the suction sheath 2 includes a sheath body 21 and a sheath handle 22. The distal end of the sheath body 21 is connected to the proximal end of the suction funnel 1, that is, the distal end of the sheath body 21 is connected to the suction funnel 1 through a connecting ring. The sheath handle 22 is used to control the distal end of the sheath body 21 to bend toward the proximal side.

[0047] Optionally, the sheath handle 22 can control the distal end of the sheath body 21 to bend 180° toward the proximal side in two opposite directions. For example, the sheath handle 22 can control the sheath body 21 to bend upward first and then toward the proximal end, or downward first and then toward the proximal end.

[0048] During use, the suction port of the suction funnel 1 can be adjusted to a suitable suction direction or suction angle by operating the handle 22, so that it can be more accurately aimed at the thrombus, which is convenient for thrombus suction and helps to shorten the operation time.

[0049] Compared with the prior art, the thrombus aspiration device in the embodiment of the present invention is provided with a suction funnel at the distal end of the aspiration sheath, and the suction funnel is an expandable funnel-shaped stent structure. Therefore, after the suction funnel is released, it can support the inner wall of the blood vessel at the tube mouth of the suction sheath, so that the tube mouth of the suction sheath is centered and does not cling to one side of the blood vessel wall, thereby avoiding damage to the inner wall of the blood vessel. At the same time, the suction funnel can also provide a larger thrombus aspiration port, thereby improving the aspiration efficiency and reducing the amount of blood loss. Moreover, the aspiration sheath in the thrombus aspiration device of this embodiment can also be bent according to the shape of the blood vessel, thereby meeting the aspiration needs of blood vessels of different shapes.

[0050] See also Figure 4-5 As shown, the third embodiment of the present invention provides a pusher 3, which can be used in conjunction with the thrombus aspiration device described in the first or second embodiment. The pusher of this embodiment can be inserted into the aspiration sheath 2 of the thrombus aspiration device, and is used to transport and release the aspiration funnel 1 disposed at the distal end of the aspiration sheath 2.

[0051] The pusher 3 of the embodiment of the present invention comprises: a push head 31 , a push rod 32 and a driving assembly.

[0052] The push head 31 has an annular cavity with an opening toward the proximal end and used to accommodate the suction funnel 1 in a compressed state, so as to facilitate the suction funnel 1 to be received in the push head 31 from the distal end. Furthermore, the distal end of the push head 31 is tapered, that is, the push head 31 has a tapered tip, which can improve the guiding and propulsion capabilities of the suction sheath 2 in the blood vessel.

[0053] The distal end of the push rod 32 is connected to the proximal end of the push head 31. The push head 31 and the push rod 32 can be inserted into the suction sheath 2 and can move axially relative to the suction sheath 2. The push head 31 can be fixed to the distal end of the push rod 32 by welding, gluing or thermal fusion.

[0054] The distal end of the driving assembly can be connected to the proximal end of the suction sheath 2 . The driving assembly is fixedly connected to the pushing rod 32 and is used to drive the pushing rod 32 to move distally in the suction sheath 2 to release the suction funnel 1 .

[0055] See also Figure 4-5When in use, the pusher 3 is inserted into the suction sheath 2, the suction funnel 1 at the distal end of the suction sheath 2 is received in the annular cavity of the pusher head 31, and the distal end of the drive assembly is connected to the proximal end of the suction sheath 2. Then the suction sheath 2 is pushed to the thrombus suction position, and the pusher head 31 is driven by the drive assembly to drive the pusher rod 32 to move axially toward the distal end in the suction sheath 2 to release the suction funnel 1, so that the distal end opening of the suction funnel 1 faces the thrombus. Then the pusher 3 is withdrawn as a whole until the suction sheath 2 is completely withdrawn.

[0056] The driving assembly may include: a push handle and a push button 35. The push handle is a tubular structure, and the push rod 32 is inserted through the push handle and can move axially relative to the push handle. The push handle is provided with a sliding lock mechanism, and the push button 35 is fixedly connected to the push rod 32 and cooperates with the sliding lock mechanism. The push button 35 is used to drive the push rod 32 to move axially relative to the push handle, and the sliding lock mechanism can lock the push button 35 to the push handle. When the push head 31 reaches the target thrombus position, it only needs to push the push button 35 to make the push rod 32 drive the push head 31 to move distally to release the suction funnel 1. When the push button 35 is released, the sliding lock mechanism can automatically lock the push button 35 on the push handle to prevent the pusher 3 from moving in the suction sheath 2.

[0057] The push handle may include: a handle body 34 and a handle connector 33 fixed at the distal end of the handle body 34, and the handle connector 33 is used to connect the pusher 3 to the proximal end of the suction sheath 2. The handle connector 33 may be screwed to the proximal end of the suction sheath 2.

[0058] The slide lock mechanism includes: a slide groove symmetrically arranged on the peripheral wall of the handle body 34 and extending in the axial direction, and an elastic locking member fixed in the handle body 34 and extending in the axial direction, and the elastic locking member has two sets of symmetrically arranged racks. Each set of racks includes a plurality of saw teeth 36 evenly distributed in the axial direction. The push button 35 includes two symmetrically arranged operating parts, and the outer end 351 of each operating part is exposed from the slide groove, and the inner end of the operating part includes: a fixing part 353 connected to the push rod 32 and a locking head 352 pressed against the rack. The push button 35 can move in the handle body along the slide groove. The rack can be made of elastic material, and the push rod 32 can be moved axially relative to the push handle by pushing the outer end of the push button 35 to overcome the resistance of the rack to the locking head 352 at the inner end of the push button. The push button 35 can be locked on the push handle by the locking action of the rack. The shape of the saw teeth 36 can facilitate the push button to move to the distal end and prevent the push button from moving to the proximal end.

[0059] The pusher of the embodiment of the present invention can lock the push rod on the push handle when the push button is not pushed, and can automatically unlock and make the push head move toward the distal end to release the sheath positioning bracket when the push button is pushed, which is convenient to operate.

[0060] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A thrombus aspiration device, characterized in that: include: Suction sheath and suction funnel; The suction funnel comprises: a funnel support and a covering film; The funnel stent is an expandable and contractible funnel-shaped stent structure with a large distal opening and a small proximal opening; the proximal end of the funnel stent is connected to the distal end of the suction sheath; The coating is coated on the funnel support; The funnel support comprises: a plurality of support bars and a connecting ring; The connecting ring is fixedly arranged at the distal end of the suction sheath tube, the proximal ends of the plurality of support strips are connected to the connecting ring, the plurality of support strips are evenly spaced around the center of the connecting ring and form a funnel-shaped support skeleton extending from the proximal end to the distal end; the covering film is fixedly arranged on the support skeleton and forms a funnel-shaped suction structure together with the funnel support; the support strips include: an axial support strip connected to the connecting ring at the proximal end and a circumferential support strip vertically connected to the distal end of the axial support strip; the circumferential support strips of the plurality of support strips are circumferentially aligned; The peripheral wall of the suction funnel is provided with a plurality of through holes; The thrombus aspiration device further comprises: a pusher, which can be inserted into the aspiration sheath of the thrombus aspiration device and is used to transport and release the aspiration funnel disposed at the distal end of the aspiration sheath; the pusher comprises: A push head having an annular cavity with an opening toward the proximal end and used for accommodating the suction funnel in a compressed state; A push rod, the distal end of which is connected to the proximal end of the push head, the push rod and the push head can be inserted into the suction sheath tube and can move axially relative to the suction sheath tube; and A drive assembly, the distal end of which is connected to the proximal end of the suction sheath, is fixedly connected to the push rod and is used to drive the push rod to move distally in the suction sheath to release the suction funnel.

2. The thrombus aspiration device according to claim 1, characterized in that: The axial support strip is connected to the connecting ring in an arc shape, and the axial support strip is connected to the circumferential support strip in an arc shape.

3. The thrombus aspiration device according to claim 1, characterized in that: The plurality of through holes include a plurality of through hole groups opened on the coating between any two adjacent support bars; each of the through hole groups includes a plurality of through holes; the through holes in the plurality of through hole groups are circumferentially aligned, and the area of ​​each through hole in each of the through hole groups increases with the increase of the distance between the support bars on both sides.

4. The thrombus aspiration device according to claim 1, characterized in that: The coating is made of the following materials: polyethylene, ultra-high molecular weight polyethylene, polyester, nylon or polyurethane.

5. The thrombus aspiration device according to claim 1, characterized in that: The funnel bracket is made of memory metal pipe by laser engraving.

6. The thrombus aspiration device according to claim 1, characterized in that: The suction sheath comprises a sheath body and a sheath handle; The sheath handle is used to control the distal end of the sheath body to bend toward the proximal end.

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