CN115844489A

CN115844489A - Supplementary thrombus entrapment device that gets back of thrombus device

Info

Publication number: CN115844489A
Application number: CN202310105429.6A
Authority: CN
Inventors: 黄嘉平; 荆洪娟; 柯长奋
Original assignee: Hangzhou Yike Medical Technology Co ltd
Current assignee: Hangzhou Yike Medical Technology Co ltd
Priority date: 2022-12-06
Filing date: 2023-02-08
Publication date: 2023-03-28
Anticipated expiration: 2043-02-08
Also published as: CN115844489B

Abstract

The invention discloses a thrombus trapping device assisting in withdrawing a thrombus taking device, which comprises a sheath tube, a trapping tube and a trapping net, wherein the trapping tube and the trapping net can be contained in the sheath tube, the trapping net is provided with a first opening end and a second opening end, the first opening end is connected with the far end of the trapping tube, in an initial state, the inside of the trapping net is turned over to the outside to form an everting state, the first opening end is turned inwards and then is relatively and fixedly connected to the far end of the trapping tube to form the far end of the trapping net, the trapping net forms an everting guide surface at the position close to the first opening end, and the second opening end is a free end and forms the near end of the trapping net; the collection tube is configured to urge the interior of the collection mesh on the exterior thereof to rapidly invert inwardly along the inverted guide surface to at least partially envelop the embolectomy device as the collection tube is moved distally in a proximal direction, thus assisting in smooth withdrawal of the embolectomy device to prevent thrombus from escaping from the embolectomy device during withdrawal.

Description

Supplementary thrombus entrapment device that gets back of thrombus device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a thrombus trapping device for assisting in withdrawing a thrombus taking device.

Background

Vascular embolism is a vascular disease that can cause tissue ischemia, including arterial thromboembolic diseases and venous thromboembolic diseases. The thrombus taking device is a medical instrument for realizing mechanical thrombus taking, and the thrombus taking device is used for taking thrombus by using a thrombus taking net, which is also called a thrombus taking bracket and is usually of an automatic expansion type, and has a radial contraction state and a radial expansion state.

After the thrombectomy device captures the thrombus, the thrombectomy device is typically withdrawn into a sheath that is partially inserted into the vessel and withdrawn completely out of the vessel along the sheath. In the process, because the thrombus removal device is compressed and can be withdrawn into the sheath, the thrombus often escapes from the thrombus removal device due to extrusion between the proximal end of the thrombus removal device and the distal end of the sheath, so that the thrombus removal is incomplete.

Disclosure of Invention

The invention aims to solve the technical problem of providing a thrombus trapping device, which is used for wrapping a thrombus taking device to assist the thrombus taking device to withdraw in the process of withdrawing the thrombus taking device to a sheath tube so as to overcome the technical defect that thrombus is easy to escape from the thrombus taking device in the process of withdrawing the thrombus taking device to the sheath tube in the prior art.

According to the invention, the thrombus trapping device for assisting in withdrawing the thrombus taking device comprises a sheath tube, a trapping tube and a trapping net, wherein the trapping pipe and the trapping net can be contained in the sheath tube, the trapping net is used for at least partially wrapping the thrombus taking device to trap thrombus, the trapping net is provided with a first opening end and a second opening end which are opposite in the axial direction, the first opening end is connected with the far end of the trapping tube, in an initial state, the inside of the trapping net is turned to the outside to form an everted state, the first opening end is turned inwards and then is relatively fixedly connected to the far end of the trapping tube to form the far end of the trapping net, the trapping net forms an inwards-turned guide surface close to the first opening end, and the second opening end is a free end and forms the near end of the trapping net; the trapping pipe is configured to drive the inside of the trapping net, which is positioned outside, to quickly turn inwards along the inwards-turned guide surface to wrap at least part of the bolt taking device when the trapping pipe moves towards the near end direction along the far end, after the trapping net turns inwards to a certain position, the first opening end forms the near end of the trapping net, and the second opening end forms the far end of the trapping net.

Further, in the process that the collecting tube moves towards the near end direction along the far end, the sheath tube is abutted to the collecting net, so that the collecting net is turned inwards.

Furthermore, the catching net is sleeved on the outer wall of the sheath tube, and the far end of the sheath tube is abutted to the first opening end to enable the catching net to turn inwards.

Furthermore, the distal end of the sheath tube is a conical end, and the trapping net is sleeved on the outer wall of the sheath tube along the conical end.

Further, the second open end can with the sheath pipe butt, the distal end butt second open end of sheath pipe makes the inside upset of trapping net.

Furthermore, after the second opening end is abutted to the far end of the sheath tube, the trapping net is sleeved outside the sheath tube along the far end of the sheath tube, so that the far end of the sheath tube is abutted to the first opening end to enable the trapping net to turn inwards.

Furthermore, an elastic net is arranged in the collecting pipe, and the first opening end is fixedly connected with the far end of the elastic net.

Further, the distal end of the elastic net extends beyond the distal end of the collection pipe and is turned outwardly to form a collection net.

Further, the inverted guide surface is a conical cambered surface.

Furthermore, the collecting net has a radially contracted state and a radially expanded state, the collecting net is in the contracted state when being positioned in the sheath tube, the collecting net is in the expanded state when being positioned outside the sheath tube, and the radial size of the collecting net in the expanded state is larger than that of the sheath tube.

Compared with the prior art, the invention is provided with the catching net to wrap the thrombus taking device so as to assist the thrombus taking device to be successfully retracted and further prevent thrombus from escaping from the thrombus taking device in the retracting process, the catching net is turned inside to outside to form an eversion state in the initial state, the first opening end is turned inside and then is relatively fixedly connected to the far end of the catching pipe, and the catching net forms an eversion guide surface close to the first opening end, namely, the catching net is in the eversion state and forms the eversion guide surface in the initial state, so that the catching net is more easily turned inside to restore, the catching net is more easily turned inside to wrap the thrombus taking device at least partially, the wrapping is more smooth and stable, the condition of package failure can not occur, the thrombus can be effectively caught, and the thrombus can be effectively prevented from escaping from the thrombus taking device to cause incomplete thrombus taking.

Drawings

A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings.

FIG. 1 is a schematic view showing the construction of a thrombus trapping device in which a trapping net is located in a trapping tube.

Fig. 2 is a sectional view of fig. 1.

FIG. 3 is a schematic structural view of the thrombus collecting device with the collecting net arranged outside the collecting tube but not sleeved on the sheath tube.

FIG. 4 is a schematic structural view of the thrombus collecting device with a collecting net arranged outside the collecting tube and sleeved on the sheath tube.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a partial view of fig. 5.

FIGS. 7 to 8 are views showing the states of use of the thrombus trapping device.

In the drawings: 1 is a sheath pipe, 2 is a collecting pipe, 3 is a collecting net, 4 is a first opening end, 5 is a second opening end, 6 is an inward turning guide surface, 7 is an outer layer, 8 is an elastic net, and 9 is an inner layer; 100 is a thrombectomy device.

It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.

Detailed Description

In order that the present invention may be more clearly and easily understood, the following detailed description is given in conjunction with the specific embodiments and the accompanying drawings.

The references to "proximal" and "distal" in the present invention are to be understood as referring to the direction of the attending clinician, "proximal" referring to the end closer to the attending clinician, i.e., corresponding to the reference to the "left end" with reference to the drawings, and "distal" referring to the end further from the attending clinician, i.e., corresponding to the reference to the "right end" with reference to the drawings.

As shown in fig. 1 to 8, the thrombus trapping device of the present embodiment includes a sheath 1, and a trapping tube 2 and a trapping net 3 which can be accommodated in the sheath 1, wherein a part of the sheath 1 is inserted into a blood vessel, another part of the sheath 1 is exposed to the blood vessel, the embolectomy device 100 is inserted into the blood vessel through the sheath 1 to embolise the thrombus, and is retracted into the sheath 1 to withdraw the blood vessel after embolectomy, the sheath 1, the trapping tube 2, and the embolectomy device 100 are coaxially arranged, the trapping net 3 has a radially contracted state and a radially expanded state, the trapping net 3 is contracted when located in the sheath 1, the trapping net 3 is expanded when located outside the sheath 1, the trapping net 3 has a first open end 4 and a second open end 5 which are axially opposed, the first open end 4 is coupled to a distal end of the trapping tube 2, and the second open end 5 is a free end.

The catching net 3 is used to at least partially wrap the embolectomy device 100 during the process that the embolectomy device 100 with thrombus is withdrawn into the sheath 1, specifically, the catching net 3 can wrap at least the proximal end of the embolectomy net of the embolectomy device 100 completely, because the proximal end of the embolectomy net of the embolectomy device 100 is open or the mesh of the proximal end of the embolectomy net is large, when the embolectomy net is withdrawn into the sheath 1, the thrombus is easy to escape from the embolectomy net due to the embolectomy net pressing against the inner wall of the sheath 1, and the catching net 3 is at least partially wrapped and attached to the embolectomy net to avoid the problem, and for the purpose of improving the effect, the mesh of the catching net 3 can be set smaller than that of the embolectomy net, and the catching net 3 can be set thinner to have better elastic attachment performance.

In an initial state, the inside of the catching net 3 is turned to the outside to form an everting state, the first opening end 4 is connected to the far end of the catching pipe 2 relatively and fixedly after being turned inwards to form the far end of the catching net 3, the catching net 3 is enabled to form an inwards-turned guide surface 6 at the position close to the first opening end 4, the inwards-turned guide surface 6 is a conical arc surface, the near end of the embolectomy net is convenient to withdraw to the catching net 3 and even to the inside of the sheath pipe 1, the catching net 3 can be conveniently turned inwards to restore at a follow-up speed after being located at the outside, and the second opening end 5 is a free end and forms the near end of the catching net 3. The collection pipe 2 is configured to be moved in a distal to proximal direction to cause the inside of the collection net 3, which is external, to be rapidly turned inwards along the in-turned guide surfaces 6 to at least partially wrap the embolectomy device 100, e.g., to completely wrap the proximal end of the embolectomy net of the embolectomy device 100, and when the collection net 3 is turned inwards into position, the first open end 4 forms the proximal end of the collection net 3, the second open end 5 forms the distal end of the collection net 3, and the collection net 3 is attached to the embolectomy device 100.

Thus, the catching net 3 is in an eversion state and forms the inverted guide surface 6 in the initial state, so that the catching net 3 is more easily inverted inwards to restore, the catching net 3 is more easily inverted to wrap the thrombus taking device 100 at least partially, the wrapping is smoother and more stable, the failure of wrapping cannot occur, thrombus can be effectively prevented from escaping from the thrombus taking device 100, and the thrombus can be effectively caught.

And the radial dimension of the catching net 3 in the expanded state is larger than that of the sheath tube 1, so that when the catching net 3 is positioned outside the sheath tube 1 and the catching tube 2 moves towards the near end direction along the far end, the catching net 3 can be gradually sleeved on the outer wall of the sheath tube 1 positioned in the blood vessel along the far end of the sheath tube 1, so that the sheath tube 1 can be abutted against the catching net 3 to enable the catching net 3 to turn inwards, and further the catching net 3 is enabled to turn inwards more easily, and the thrombus taking device 100 is wrapped more smoothly.

Here, the sheath 1 can abut against the capture net 3 so that the capture net 3 is turned inward, it can be understood that, as shown in fig. 4, after the capture net 3 is fitted over the outer wall of the sheath 1, when the capture pipe 2 moves in the distal end to the proximal end direction, the distal end of the sheath 1 abuts against the first open end 4 of the capture net 3 so that the capture net 3 is turned inward, or, as shown in fig. 3, the capture net 3 is not fitted over the outer wall of the sheath 1, and the second open end 5 of the capture net 3 can abut against the sheath 1 (in the case where the sheath 1 is curved), so that the distal end of the sheath 1 abuts against the second open end 5 of the capture net 3 so that the capture net 3 is turned inward, that is, during the movement of the capture pipe 2 in the distal end to the proximal end direction, the second open end 5 of the capture net 3 abuts against the distal end of the sheath 1 so that the capture net 3 is fitted over the outer wall of the sheath 1 immediately, and at this time, the capture net 3 abuts against the distal end of the capture net 1 so that the capture net 3, the distal end of the capture net 3 can also gradually turn over along the distal end of the capture net 1, and the capture net 3 can be turned over the distal end of the sheath 1, and the capture net 3 can also be turned over. In order to facilitate the collection net 3 to be smoothly sleeved at the far end of the sheath tube 1, the far end of the sheath tube 1 is set to be a conical end, so that the collection net 3 is sleeved on the outer wall of the sheath tube 1 along the conical end.

The collecting pipe 2 comprises an outer layer 7, an elastic net 8 and an inner layer 9, the outer layer 7, the elastic net 8 and the inner layer 9 are coaxially arranged, the elastic net 8 is located between the outer layer 7 and the inner layer 9, namely the collecting pipe 2 is of a three-layer pipe structure, the elastic net 8 is mainly used for improving the supporting performance, the bending resistance and the tensile performance of the collecting pipe 2, the first opening end 4 of the collecting net 3 is fixedly connected with the far end of the elastic net 8, so that the connecting strength between the collecting net 3 and the collecting pipe 2 is improved, of course, the far end of the elastic net 8 can extend out of the far end of the collecting pipe 2 and then turn outwards to form the collecting net 3, and therefore the collecting net 3 can be turned inwards easily to restore.

In actual use, as shown in fig. 1, the sheath tube 1 accommodating the trap tube 2 and the trap net 3 is inserted into the blood vessel at least partially, the trap tube 2 is pushed in the proximal-distal direction with respect to the sheath tube 1 so that the trap net 3 is positioned outside the sheath tube 1 and on the distal side of the sheath tube 1 as shown in fig. 3, the sheath tube 1 is pushed in the proximal-distal direction with respect to the trap tube 2 so that the trap net 3 is fitted over the sheath tube 1 and the first open end 4 of the trap net 3 abuts against the first open end 4 as shown in fig. 4, and the thrombus-capturing device 100 is inserted into the blood vessel through the trap tube 2 to capture thrombus. After the thrombus is captured by the embolectomy device 100, the embolectomy device 100 is pulled in a distal-proximal direction relative to the sheath 1 until the proximal end of the embolectomy device 100 contacts the trapping net 3, that is, the first open end 4 close to the trapping net 3 is shown in fig. 7, then the embolectomy device 100 and the trapping pipe 2 are synchronously pulled in a distal-proximal direction (for example, the embolectomy device 100 and the trapping pipe 2 are relatively fixed, and the trapping pipe 2 is synchronously pulled only in a distal-proximal direction), then the inside of the trapping net 3, which is at the outside, is rapidly turned inwards along the turned-in guide surface 6 to at least partially wrap the embolectomy network of the embolectomy device 100, and finally the embolectomy device 100 is continuously pulled in a distal-proximal direction relative to the sheath 1 to withdraw the embolectomy device 100 from the blood vessel as the embolectomy device 100 is withdrawn into the sheath 1 as shown in fig. 8.

It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art that many changes and modifications can be made, or equivalents employed, to the presently disclosed embodiments without departing from the intended scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims

1. The thrombus trapping device comprises a sheath tube (1), and a trapping tube (2) and a trapping net (3) which can be accommodated in the sheath tube (1), wherein the trapping net (3) is used for at least partially wrapping the thrombus trapping device (100) to trap thrombus, the trapping net (3) is provided with a first open end (4) and a second open end (5) which are axially opposite, the first open end (4) is connected with the far end of the trapping tube (2), the thrombus trapping device is characterized in that in an initial state, the inside of the trapping net (3) is turned to the outside to form an eversion state, the first open end (4) is relatively and fixedly connected to the far end of the trapping tube (2) after being turned inwards to form the far end of the trapping net (3), the trapping net (3) forms an eversion guide surface (6) near the first open end (4), and the second open end (5) is a free end and forms the near end of the trapping net (3); the collection pipe (2) is configured to drive the collection net (3) to be rapidly turned inwards along the inwards-turned guide surface (6) to at least partially wrap the embolectomy device (100) when the collection pipe is moved in the distal-to-proximal direction, and after the collection net (3) is turned inwards to a position, the first open end (4) forms the proximal end of the collection net (3) and the second open end (5) forms the distal end of the collection net (3).

2. A thrombus trap according to claim 1, wherein during the movement of the trap tube (2) in the distal-to-proximal direction, the sheath tube (1) abuts against the trap net (3) so that the trap net (3) is turned inward.

3. The thrombus trapping device according to claim 2, wherein the trapping net (3) is fitted over the outer wall of the sheath (1), and the distal end of the sheath (1) abuts against the first open end (4) so that the trapping net (3) is turned inward.

4. The thrombus trapping device according to claim 3, wherein the distal end of the sheath (1) is a tapered end, and the trapping net (3) is fitted over the outer wall of the sheath (1) along the tapered end.

5. The thrombus trap according to claim 2, wherein the second open end (5) is capable of abutting with the sheath (1), and the distal end of the sheath (1) abuts with the second open end (5) so that the trap net (3) is turned inward.

6. The thrombus trapping device according to claim 5, wherein after the second open end (5) abuts against the distal end of the sheath tube (1), there is a state in which the trapping net (3) is fitted outside the sheath tube (1) along the distal end of the sheath tube (1) to bring the distal end of the sheath tube (1) into abutment against the first open end (4) so that the trapping net (3) is turned inward.

7. A thrombus trapping device according to claim 1, wherein an elastic net (8) is provided in the trapping tube (2), and the first open end (4) is fixedly connected to a distal end of the elastic net (8).

8. A thrombus trap device according to claim 7, wherein the distal end of the elastic net (8) is turned outward after extending beyond the distal end of the trap tube (2) to form the trap net (3).

9. The thrombus trapping device according to claim 1, characterized in that the inverted guide surface (6) is a tapered arc surface.

10. A thrombus trapping device according to claim 1, wherein the trapping net (3) has a radially contracted state and a radially expanded state, the trapping net (3) is in the contracted state when located inside the sheath (1), the trapping net (3) is in the expanded state when located outside the sheath (1), and a radial dimension of the trapping net (3) in the expanded state is larger than a radial dimension of the sheath (1).