Blood vessel thrombus extraction device capable of efficiently cutting thrombus

Abstract

The blood vessel thrombus extraction device comprises a protective sleeve and a thrombus extraction assembly, the protective sleeve is provided with a containing cavity used for containing the thrombus extraction assembly in the length direction, and the thrombus extraction assembly comprises a push rod, a traction wire fixedly connected to the end of the push rod and a self-expansion thrombus extraction support arranged on the traction wire. The push rod drives the self-expanding thrombectomy stent in the storage state to be pushed out of the containing cavity, so that the self-expanding thrombectomy stent is automatically and radially expanded from the storage state to the use state; the self-expansion thrombectomy stent comprises a carving stent and a woven mesh basket which are fixedly connected, the end, away from the woven mesh basket, of the carving stent is fixedly connected with a push rod, the end, away from the carving stent, of the woven mesh basket is fixedly connected with a traction wire, and the carving stent can be elastically compressed or released in the radial direction. The woven mesh basket is driven to synchronously contract or release and unfold in the radial direction relative to the traction wires, and a plurality of through holes for blood circulation are formed in the carving support and the woven mesh basket in the release state. The thrombus cutting device has the effects of improving the thrombus cutting effect, efficiently removing thrombus and improving the thrombus removing safety.

Description

Technical Field

[0001] The present invention relates to the technical field of thrombus removal stents, and in particular to a vascular thrombus removal device for efficiently cutting thrombi. Background Art

[0002] Deep vein thrombosis (DVT) is a common peripheral venous disease in clinical practice. Most patients with DVT have no obvious symptoms, so the rate of early missed diagnosis and misdiagnosis is high, and only 20% of DVT is clinically diagnosed.

[0003] Thrombectomy stents are currently an effective treatment method in the clinical treatment of peripheral venous surgery. Among them, self-expanding thrombectomy stents are an important innovation in modern stent thrombectomy medical technology. This type of stent adopts a self-expanding design, has good flexibility and lasting expansion force, can adhere to and fix on the blood vessel wall, effectively capture and remove thrombi, is easy to operate, and can be delivered to the thrombus site through catheter technology, which significantly improves the treatment effect of vascular embolism and reduces the surgical risk and recovery time of patients. Although self-expanding thrombectomy stents have significant advantages in the treatment of vascular embolism, they also have some disadvantages. For example, the expansion force of self-expanding thrombectomy stents is limited by the stent pattern and structure. For target blood vessels with larger diameters, if its outward expansion force is small, it is easy to have low embedding degree of large thrombi and easy thrombi to fall off; if its outward expansion force is large, it will cause the thrombectomy stent to have a large retraction force, which will cause the stent to deform and thrombi to fall off during retraction, and the thrombi are not cut thoroughly, which is easy to cause thrombi to remain, which needs to be improved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a vascular thrombus removal device for efficiently cutting thrombi, which has the effects of improving the thrombus cutting effect, the thrombus removal efficiency, and the thrombus removal safety.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a vascular thrombus removal device for efficiently cutting thrombi, comprising a protective sleeve and a thrombus removal assembly, wherein the protective sleeve is provided with a receiving cavity for receiving the thrombus removal assembly along the length direction, and the thrombus removal assembly comprises a push rod, a traction wire fixedly connected to the end of the push rod, and a self-expanding thrombus removal stent arranged on the traction wire, wherein the push rod drives the self-expanding thrombus removal stent in a received state to be pushed out of the receiving cavity, so that the self-expanding thrombus removal stent is automatically radially expanded from the received state to a use state; The self-expanding thrombus removal stent includes a carved stent and a woven basket that are fixedly connected to each other. The end of the carved stent away from the woven basket is fixedly connected to the push rod, and the end of the woven basket away from the carved stent is fixedly connected to the traction wire. The carved stent can be elastically compressed or expanded in the radial direction, and drive the woven basket to synchronously contract or expand in the radial direction relative to the traction wire, and a plurality of through holes for blood circulation are formed on the carved stent and the woven basket in the expanded state.

[0006] By adopting the above technical scheme, in the initial state, the self-expanding thrombectomy stent is compressed and accommodated in the accommodating cavity of the protective sleeve, the head of the protective sleeve is passed through the thrombus, and then the push rod is pushed. The push rod pushes the self-expanding thrombectomy stent out from the end of the accommodating cavity through the traction wire, so that the self-expanding thrombectomy stent and the protective sleeve are separated from each other, and the carving stent is radially expanded to the use state by its own self-expansion force. Since the carving stent is fixedly connected to the end of the woven basket, the radially expanded carving stent drives the woven basket to expand radially synchronously, and then the self-expanding thrombectomy stent is driven to move by pulling the push rod. During the movement of the self-expanding thrombectomy stent, the carving stent can be used to cut around the thrombus. The cut-off thrombus is collected and removed by the woven mesh basket. The present invention utilizes the radial expansion of the carved stent to drive the synchronous expansion of the woven mesh basket. The two cooperate with each other to control the radial expansion force of the self-expanding thrombectomy stent, so that the self-expanding thrombectomy stent is just expanded to a state of being in contact with the inner wall of the blood vessel, thereby preventing the radial expansion force of the self-expanding thrombectomy stent from being too large and causing damage to the blood vessel, thereby effectively shortening the operation time and improving the safety of thrombus removal. In addition, the through holes formed on the carved stent and the woven mesh basket in the expanded state are used to allow blood to pass through the self-expanding thrombectomy stent to prevent blood vessel blockage, thereby improving the thrombus cutting effect, thrombus removal efficiency, and improving the safety of thrombus removal.

[0007] The present invention is further configured as follows: the woven mesh basket is configured in a conical shape, the woven mesh basket comprises a large end and a small end, and the outer diameter of the woven mesh basket gradually decreases from the large end toward the small end.

[0008] By adopting the above technical solution, the conical woven mesh basket occupies less space when stored in the accommodating cavity, thereby improving the storage convenience of the woven mesh basket.

[0009] The present invention is further configured as follows: the small end of the woven basket is fixedly connected to the traction wire via a first developing ring.

[0010] By adopting the above technical solution and adding the first developing ring, the developing effect of the head end of the self-expanding thrombectomy stent after it is introduced into the blood vessel is improved, and the positioning ability and developing effect of the self-expanding thrombectomy stent are improved.

[0011] The present invention is further configured as follows: the carving bracket is in a mesh cylindrical structure, and an obliquely cut bolt inlet is provided at one end of the carving bracket close to the push rod.

[0012] By adopting the above technical solution, the oblique cut inlet can ensure that the cut thrombus can be more easily collected by the woven basket after passing through the engraved stent, and ensure that the engraved stent can be efficiently compressed when compressed and stored, thereby reducing the space occupied by the engraved stent when compressed.

[0013] The present invention is further configured as follows: a plurality of cutting skirts are formed along the circumferential direction on one end of the carving bracket connected to the woven basket.

[0014] By adopting the above technical solution, the cutting skirt can cut the thrombus residue remaining on the inner wall of the blood vessel, thereby improving the thrombus cutting effect of the present invention.

[0015] The present invention is further configured as follows: a developing site is provided at one end of the cutting skirt away from the push rod.

[0016] By adopting the above technical solution and adding the developing site, it is convenient for medical personnel to clearly distinguish the boundary between the engraved stent and the woven basket in the blood vessel.

[0017] The present invention is further configured as follows: one end of the engraving bracket away from the woven basket is fixedly connected to the end of the push rod through a second developing ring.

[0018] By adopting the above technical solution, the second developing ring can help medical personnel to clearly see the position of the end of the engraving bracket close to the push rod in the blood vessel.

[0019] The present invention is further configured as follows: one end of the traction wire passes through the self-expanding thrombectomy stent and extends to form a guide head, and the outer diameter of the guide head gradually decreases from an end close to the self-expanding thrombectomy stent to an end away from the self-expanding thrombectomy stent.

[0020] By adopting the above technical solution, the guiding head can explore the path in the blood vessel, thereby guiding the present invention to quickly reach the predetermined position.

[0021] The present invention is further configured as follows: the engraving support is composed of a plurality of cutting strips, and the side walls of the cutting strips are provided with a plurality of cutting edges along the length direction.

[0022] By adopting the above technical solution, the cutting edges of multiple cutting strips cooperate with each other to perform circumferential cutting on the thrombus in the blood vessel, so that the thrombus can be cut off quickly, thereby improving the high efficiency of the present invention in cutting the thrombus.

[0023] The present invention is further configured as follows: the protective sleeve is provided with a guide wire threading cavity arranged parallel to the accommodating cavity, the wire inlet of the guide wire threading cavity is connected to the side wall of the protective sleeve, the wire outlet of the guide wire threading cavity is connected to the end of the protective sleeve, and the protective sleeve is provided with a beveled guide surface corresponding to the wire outlet.

[0024] By adopting the above technical solution, the guide wire can enter the guide wire passage cavity through the wire inlet and pass through the wire outlet, and the beveled guide surface can ensure the guidance and smoothness of the protective sleeve when passing through the blood vessel.

[0025] In summary, the present invention has the following beneficial effects: The thrombus removal device of the present invention is composed of a sculptured stent, a woven mesh, a push rod, a traction wire and a protective sleeve. In the initial state, the self-expanding thrombus removal stent is compressed and accommodated in the accommodating cavity of the protective sleeve. The head of the protective sleeve is passed through the thrombus, and then the push rod is pushed. The push rod pushes the self-expanding thrombus removal stent out of the end of the accommodating cavity through the traction wire, so that the self-expanding thrombus removal stent and the protective sleeve are separated from each other. The sculptured stent is radially expanded to a use state by its own self-expansion force. Since the sculptured stent is fixedly connected to the end of the woven mesh basket, the radially expanded sculptured stent drives the woven mesh basket to expand radially synchronously, and then the self-expanding thrombus removal stent is driven to move by pulling the push rod. During the movement of the self-expanding thrombus removal stent, the sculptured stent can be used to The thrombus is cut around, and the cut thrombus is collected and removed by the woven basket. The present invention utilizes the radial expansion of the carved stent to drive the synchronous expansion of the woven basket. The two cooperate with each other to control the radial expansion force of the self-expanding thrombectomy stent, so that the self-expanding thrombectomy stent is just expanded to a state of being in contact with the inner wall of the blood vessel, preventing the radial expansion force of the self-expanding thrombectomy stent from being too large to cause damage to the blood vessel, thereby effectively shortening the operation time and improving the safety of thrombus removal. In addition, the through holes formed on the carved stent and the woven basket in the expanded state are used to allow blood to pass through the self-expanding thrombectomy stent to prevent blood vessel blockage, which has the effects of improving the thrombus cutting effect, the thrombus removal efficiency, and the thrombus removal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall structural diagram of the present invention, in which the self-expanding thrombectomy stent is in a stored state.

[0027] Figure 2 The present invention Figure 1 A partial enlarged view of area A.

[0028] Figure 3 The present invention Figure 1 A partial enlarged view of area B.

[0029] Figure 4 It is an overall structural diagram of the present invention, in which the self-expanding thrombectomy stent is in use.

[0030] Figure 5 It is a partial enlarged view of the carving bracket of the present invention.

[0031] In the figure: 1. protective sleeve; 11. accommodating cavity; 12. guide wire insertion cavity; 121. wire inlet; 122. wire outlet; 13. beveled guide surface; 2. push rod; 3. traction wire; 31. guide head; 4. self-expanding thrombus removal bracket; 41. engraved bracket; 411. beveled thrombus entry; 412. second developing ring; 413. cutting strip; 4131. cutting edge; 414. through hole; 42. woven basket; 421. large head end; 422. small head end; 4221. first developing ring; 423. cutting skirt; 4231. developing position; 5. locking device. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] A vascular thrombus removal device for efficiently cutting thrombus, such as Figure 1-4 As shown, it includes a protective sleeve 1 and a thrombus removal assembly. The protective sleeve 1 is provided with a receiving cavity 11 for receiving the thrombus removal assembly along its length direction. The thrombus removal assembly includes a push rod 2, a traction wire 3 fixedly connected to the end of the push rod 2, and a self-expanding thrombus removal bracket 4 arranged on the traction wire 3. The push rod 2 drives the self-expanding thrombus removal bracket 4 in the received state to be pushed out from the receiving cavity 11, so that the self-expanding thrombus removal bracket 4 is automatically radially expanded from the received state to the use state; the self-expanding thrombus removal bracket 4 includes a sculpture bracket 41 and a woven basket 42 fixedly connected, and the sculpture bracket 4 1 is fixedly connected to the push rod 2 at one end away from the woven basket 42, and is fixedly connected to the traction wire 3 at one end of the woven basket 42 away from the carving bracket 41. The carving bracket 41 can be elastically compressed or expanded in the radial direction, and drives the woven basket 42 to shrink or expand synchronously in the radial direction relative to the traction wire 3, and a plurality of through holes 414 for blood circulation are formed on the carving bracket 41 and the woven basket 42 in the expanded state. In this embodiment, a locking device 5 is provided at the rear end of the protective sleeve 1, and the locking device 5 is used to lock and position the push rod 2 relative to the protective sleeve 1.

[0034] like Figure 1-2 and Figure 4As shown, the woven mesh basket 42 is set in a cone shape, and the woven mesh basket 42 includes a large head end 421 and a small head end 422. The outer diameter of the woven mesh basket 42 gradually decreases from the large head end 421 to the small head end 422. When the woven mesh basket 42 with a cone shape is stored in the accommodating cavity 11, it occupies a smaller space, thereby improving the storage convenience of the woven mesh basket 42; the small head end 422 of the woven mesh basket 42 is fixedly connected to the traction wire 3 through the first developing ring 4221. The addition of the first developing ring 4221 improves the head end of the self-expanding thrombectomy stent 4 after it is introduced into the blood vessel. The imaging effect improves the positioning ability and imaging effect of the self-expanding thrombus removal stent 4; the carving stent 41 is a mesh cylindrical structure, and the end of the carving stent 41 close to the push rod 2 is provided with an oblique plug entry 411, which can ensure that the cut thrombus is more easily collected by the woven basket 42 after passing through the carving stent 41, and ensure that the carving stent 41 can be efficiently compressed when compressed and stored, reducing the space occupied by the carving stent 41 when compressed; the end of the carving stent 41 connected to the woven basket 42 is formed with a plurality of cutting skirts along the circumferential direction The cutting skirt 423 can cut the thrombus residue remaining on the inner wall of the blood vessel, thereby improving the thrombus cutting effect of the present invention; the end of the cutting skirt 423 away from the push rod 2 is provided with a developing site 4231, and the addition of the developing site 4231 facilitates medical personnel to clearly distinguish the boundary between the engraving support 41 and the woven basket 42 located in the blood vessel; the end of the engraving support 41 away from the woven basket 42 is fixedly connected to the end of the push rod 2 through the second developing ring 412, and the second developing ring 412 facilitates medical personnel to clearly engrave The end of the stent 41 close to the push rod 2 is positioned in the blood vessel; one end of the traction wire 3 passes through the self-expanding thrombectomy stent 4 and extends to form a guiding head 31, and the outer diameter of the guiding head 31 gradually decreases from the end close to the self-expanding thrombectomy stent 4 to the end away from the self-expanding thrombectomy stent 4. In this embodiment, the traction wire 3 can be set as a tough metal wire or polymer fiber wire, and the guiding head 31 of the traction wire 3 has sufficient flexibility to enable it to bend freely. The guiding head 31 can explore the path in the blood vessel, thereby guiding the present invention to quickly reach the predetermined position.

[0035] like Figure 3-4 As shown, the protective sleeve 1 is provided with a guide wire passage cavity 12 which is arranged parallel to the accommodating cavity 11, the wire inlet 121 of the guide wire passage cavity 12 is connected to the side wall of the protective sleeve 1, the wire outlet 122 of the guide wire passage cavity 12 is connected to the end of the protective sleeve 1, and the protective sleeve 1 is provided with a beveled guide surface 13 corresponding to the wire outlet 122, the guide wire can enter the guide wire passage cavity 12 through the wire inlet 121 and pass through the wire outlet 122, and the beveled guide surface 13 can ensure the guiding property and smoothness of the protective sleeve 1 when passing through the blood vessel.

[0036] like Figure 1-2 and Figure 5As shown, the engraving bracket 41 is composed of a plurality of cutting strips 413, and the side walls of the cutting strips 413 are provided with a plurality of cutting edges 4131 along the length direction. The cutting edges 4131 of the plurality of cutting strips 413 cooperate with each other, and can perform circumferential cutting on the thrombus in the blood vessel, so that the thrombus can be quickly cut off, thereby improving the high efficiency of the present invention in cutting the thrombus; the adjacent cutting strips 413 cooperate with each other and form a plurality of through holes 414 distributed in a matrix on the surface of the engraving bracket 41 and allowing blood to flow through, and each through hole 414 of the engraving bracket 41 in use is a parallelogram The cutting strips 413 are distributed, and a total of four cutting strips 413 are formed at each connecting node of the intersecting cutting strips 413. The cutting strips 413 between adjacent connecting nodes are spread out in a wave shape. The single unit of the carved pattern of the carved bracket 41 adopts an asymmetric design, which can guide the force through its short side when the carved bracket 41 is recovered and released. The cutting strips 413 of the carved bracket 41 adopt a chamfered design, which is easy to lock the thrombus and increase the fit of the carved bracket 41 to the large thrombus. When the carved bracket 41 expands, the woven basket 42 connected thereto can expand at the same time to achieve the function of intercepting the thrombus.

[0037] The basic working principle of the present invention is as follows: the thrombus removal device is composed of a carved stent 41, a woven mesh, a push rod 2, a traction wire 3 and a protective sleeve 1. In the initial state, the self-expanding thrombus removal stent 4 is compressed and accommodated in the accommodating cavity 11 of the protective sleeve 1. The head of the protective sleeve 1 passes through the thrombus, and then the push rod 2 is pushed. The push rod 2 pushes the self-expanding thrombus removal stent 4 out of the end of the accommodating cavity 11 through the traction wire 3, so that the self-expanding thrombus removal stent 4 and the protective sleeve 1 are separated from each other. The carved stent 41 radially expands to a use state by relying on its own self-expansion force. Since the carved stent 41 is fixedly connected to the end of the woven mesh basket 42, the radially expanded carved stent 41 drives the woven mesh basket 42 to expand radially synchronously, and then the self-expanding thrombus removal stent 4 is driven to move by pulling the push rod 2. During the movement, the self-expanding thrombus removal stent 4 The carved bracket 41 can be used to cut around the thrombus, and the cut thrombus is collected and removed by the woven basket 42. The present invention uses the radial expansion of the carved bracket 41 to drive the woven basket 42 to expand synchronously. The two cooperate with each other to control the radial expansion force of the self-expanding thrombectomy bracket 4, so that the self-expanding thrombectomy bracket 4 is just expanded to a state of being in contact with the inner wall of the blood vessel, preventing the self-expanding thrombectomy bracket 4 from being damaged by excessive radial expansion force, thereby effectively shortening the operation time and improving the safety of thrombus removal. In addition, the through hole 414 formed on the carved bracket 41 and the woven basket 42 in the expanded state is used to allow blood to pass through the self-expanding thrombectomy bracket 4 to prevent blood vessel blockage, which has the effects of improving the thrombus cutting effect, thrombus removal efficiency, and improving the safety of thrombus removal.

[0038] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A vascular thrombus removal device for efficiently cutting thrombus, characterized by: The invention comprises a protective sleeve (1) and a thrombus removal assembly, wherein the protective sleeve (1) is provided with a receiving cavity (11) for receiving the thrombus removal assembly along its length direction, and the thrombus removal assembly comprises a push rod (2), a traction wire (3) fixedly connected to the end of the push rod (2), and a self-expanding thrombus removal stent (4) arranged on the traction wire (3), wherein the push rod (2) drives the self-expanding thrombus removal stent (4) in a received state to be pushed out from the receiving cavity (11), so that the self-expanding thrombus removal stent (4) is automatically radially expanded from the received state to a use state; The self-expanding thrombus removal bracket (4) comprises a sculpture bracket (41) and a woven basket (42) which are fixedly connected to each other. The end of the sculpture bracket (41) away from the woven basket (42) is fixedly connected to the push rod (2), and the end of the woven basket (42) away from the sculpture bracket (41) is fixedly connected to the traction wire (3). The sculpture bracket (41) can be elastically compressed or expanded in the radial direction, and drive the woven basket (42) to synchronously contract or expand in the radial direction relative to the traction wire (3), and a plurality of through holes (414) for blood circulation are formed on the sculpture bracket (41) and the woven basket (42) in the expanded state.

2. A vascular thrombus removal device for efficiently cutting thrombi according to claim 1, characterized in that: The woven mesh basket (42) is arranged in a conical shape, and comprises a large end (421) and a small end (422). The outer diameter of the woven mesh basket (42) gradually decreases from the large end (421) toward the small end (422).

3. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: The small end (422) of the woven basket (42) is fixedly connected to the traction wire (3) via a first developing ring (4221).

4. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: The carving bracket (41) is a mesh cylindrical structure, and an obliquely cut bolt inlet (411) is provided at one end of the carving bracket (41) close to the push rod (2).

5. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: One end of the carving bracket (41) connected to the woven basket (42) is formed with a plurality of cutting skirts (423) along the circumferential direction.

6. The vascular thrombus removal device for efficiently cutting thrombus according to claim 5, characterized in that: A developing site (4231) is provided at one end of the cutting skirt (423) away from the push rod (2).

7. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: One end of the engraving bracket (41) away from the woven basket (42) is fixedly connected to the end of the push rod (2) via a second developing ring (412).

8. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: One end of the traction wire (3) passes through the self-expanding thrombectomy stent (4) and extends to form a guide head (31), and the outer diameter of the guide head (31) gradually decreases from the end close to the self-expanding thrombectomy stent (4) to the end away from the self-expanding thrombectomy stent (4).

9. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: The engraving support (41) is composed of a plurality of cutting strips (413), and the side walls of the cutting strips (413) are provided with a plurality of cutting edges (4131) along the length direction.

10. The vascular thrombus removal device for efficiently cutting thrombus according to claim 1, characterized in that: The protective sleeve (1) is provided with a guide wire passage cavity (12) arranged parallel to the accommodating cavity (11); a wire inlet (121) of the guide wire passage cavity (12) is connected to the side wall of the protective sleeve (1); a wire outlet (122) of the guide wire passage cavity (12) is connected to the end of the protective sleeve (1); and the protective sleeve (1) is provided with a beveled guide surface (13) corresponding to the wire outlet (122).

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