CN115844489B - Thrombus trapping device for assisting in withdrawing thrombus taking device - Google Patents
Thrombus trapping device for assisting in withdrawing thrombus taking device Download PDFInfo
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- CN115844489B CN115844489B CN202310105429.6A CN202310105429A CN115844489B CN 115844489 B CN115844489 B CN 115844489B CN 202310105429 A CN202310105429 A CN 202310105429A CN 115844489 B CN115844489 B CN 115844489B
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Abstract
The invention discloses a thrombus trapping device for assisting in withdrawing a thrombus taking device, which comprises a sheath tube, a trapping tube and a trapping net, wherein the trapping net can be accommodated 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 to the outside to form an everting state, the first opening end is relatively and fixedly connected to the far end of the trapping tube after being turned inwards to form the far end of the trapping net, the trapping net forms an everting guide surface near the first opening end, and the second opening end is a free end and forms the near end of the trapping net; the trapping tube is configured to drive the trapping net to rapidly turn inwardly along the inversion guide surface to at least partially wrap the thrombus extraction device when moving in the distal direction and the proximal direction, so as to assist the smooth withdrawal of the thrombus extraction device and prevent thrombus from escaping from the thrombus extraction device during the withdrawal process.
Description
Technical Field
The invention relates to the technical field of medical equipment, 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 ischemia of tissue, including arterial thromboembolic disease and venous thromboembolic disease. The thrombus taking device is a medical instrument for realizing mechanical thrombus taking, and utilizes a thrombus taking net to take out thrombus, wherein the thrombus taking net is also called a thrombus taking bracket and is usually in an automatic expansion state and has a radial shrinkage state and a radial expansion state, after the thrombus taking device is inserted into a blood vessel, the thrombus taking net of the thrombus taking device can automatically expand, so that thrombus can enter an inner cavity of the thrombus taking net to be captured by the thrombus taking net, and the thrombus can be taken out by withdrawing the thrombus taking net, so that the blood vessel can be restored to be unblocked.
After the thrombus is captured by the thrombus removal device, the thrombus removal device is typically withdrawn into a sheath partially inserted into the vessel and completely withdrawn from the vessel along the sheath. In this process, the thrombus taking device is compressed to retract into the sheath, so that thrombus can often escape from the thrombus taking device due to extrusion between the proximal end of the thrombus taking device and the distal end of the sheath, and thus incomplete thrombus taking can be caused.
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 retract in the process of retracting the thrombus taking device to a sheath so as to overcome the technical defect that thrombus is easy to escape from the thrombus taking device in the process of retracting the thrombus taking device to the sheath in the prior art.
According to the invention, there is provided a thrombus trapping device for assisting in withdrawing a thrombus taking device, comprising a sheath tube, a trapping tube and a trapping net which can be accommodated in the sheath tube, wherein 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 open end and a second open end which are opposite in axial direction, the first open end is connected with the distal 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 open end is relatively fixedly connected to the distal end of the trapping tube after being turned inwards to form the distal end of the trapping net, and the trapping net forms an everted guide surface near the first open end, and the second open end is a free end and forms the proximal end of the trapping net; the collection tube is configured to drive the inside of the collection mesh outside to rapidly turn inwardly along the inversion guide surface to at least partially wrap the thrombus capture device when moved in a distal to proximal direction, and after the collection mesh turns inwardly in place, the first open end forms a proximal end of the collection mesh and the second open end forms a distal end of the collection mesh.
Further, during movement of the collection tube in the distal direction, the sheath abuts the collection mesh such that the collection mesh is turned inwardly.
Further, the trapping net is sleeved on the outer wall of the sheath pipe, and the distal end of the sheath pipe is abutted against the first opening end so that the trapping net can be turned inwards.
Further, 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 abut against the sheath, and the distal end of the sheath abuts against the second open end so that the capturing net turns inwards.
Further, after the second opening end is abutted against the distal end of the sheath, the capturing net is sleeved outside the sheath along the distal end of the sheath, so that the state that the capturing net is turned inwards due to the fact that the distal end of the sheath abuts against the first opening end is formed.
Further, 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 web extends beyond the distal end of the collection tube and is turned outwardly to form the collection web.
Further, the inward turning guide surface is a conical cambered surface.
Further, the trapping net has a contracted state in which the trapping net is contracted radially and an expanded state in which the trapping net is expanded radially when the trapping net is positioned inside the sheath, and the radial dimension of the trapping net in the expanded state is larger than the radial dimension of the sheath.
Compared with the prior art, the invention has the advantages that the trapping net is arranged to wrap the thrombus taking device so as to assist the thrombus taking device to retract smoothly, further, thrombus can be prevented from escaping from the thrombus taking device in the process of non-return retraction, the trapping net is turned inside to outside to form an everting state in an initial state, the first opening end is relatively fixedly connected to the far end of the trapping net after being turned inwards, the trapping net is enabled to form an everting guide surface near the first opening end, namely, the trapping net is in the everting state in the initial state and forms the everting guide surface, so that the trapping net is easier to turn inwards to recover, the trapping net is easier to turn over to wrap the thrombus taking device at least partially, the wrapping is smoother and stable, the situation of wrap failure can not occur, the thrombus can be effectively trapped, and the thrombus can be effectively prevented from escaping from the inside of the thrombus taking device to cause incomplete thrombus taking.
Drawings
The invention will be more fully understood and its attendant advantages and features will be more readily understood by reference to the following detailed description, taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic view of a thrombus-trapping device with a trapping web in a trapping tube.
Fig. 2 is a cross-sectional view of fig. 1.
FIG. 3 is a schematic view of a thrombus-trapping device with a trapping mesh outside the trapping tube but not over the sheath.
FIG. 4 is a schematic view showing a structure of a thrombus-trapping device in which a trapping net is disposed outside a trapping tube and fitted over a sheath.
Fig. 5 is a cross-sectional view of fig. 4.
Fig. 6 is a partial view of fig. 5.
Fig. 7 to 8 are views showing the state of use of the thrombus-trapping device.
In the accompanying drawings: 1 is a sheath tube, 2 is a collecting tube, 3 is a collecting net, 4 is a first opening end, 5 is a second opening end, 6 is an inversion guide surface, 7 is an outer layer, 8 is an elastic net, and 9 is an inner layer; 100 is a thrombolytic device.
It should be noted that the drawings are for illustrating the invention and are not to be construed as limiting the invention. Note 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 invention may be more readily understood, a detailed description of the invention is provided below along with specific embodiments and accompanying figures.
The terms "proximal" and "distal" in the sense of the present invention should be understood as meaning, viewed from the direction of the attending physician, the term "proximal" referring to the end proximal to the attending physician, i.e. corresponding to the "left end" referred to with reference to the accompanying drawings, and the term "distal" referring to the end distal to the attending physician, i.e. corresponding to the "right end" referred to with reference to the accompanying drawings.
As shown in fig. 1 to 8, the thrombus-trapping device of the present embodiment comprises a sheath 1, a trapping tube 2 and a trapping net 3 which can be accommodated in the sheath 1, a part of the sheath 1 is penetrated in a blood vessel, another part of the sheath 1 is exposed out of the blood vessel, a thrombus-removing device 100 is inserted into the blood vessel through the sheath 1 to remove a thrombus, and is retracted into the sheath 1 to withdraw the blood vessel after the thrombus is removed, the sheath 1, the trapping tube 2 and the thrombus-removing device 100 are coaxially arranged, the trapping net 3 has a radially contracted state and a radially expanded state, the trapping net 3 is in the contracted state when being positioned in the sheath 1, the trapping net 3 is in the expanded state when being positioned outside the sheath 1, the trapping net 3 has axially opposite first and second open ends 4 and 5, the first open ends 4 are coupled with the distal end of the trapping tube 2, and the second open ends 5 are free ends.
The trapping net 3 is used for at least partially wrapping the thrombus removing device 100 during the process of withdrawing the thrombus removing device 100 into the sheath tube 1, specifically, the trapping net 3 can at least completely wrap the proximal end of the thrombus removing net of the thrombus removing device 100, because the proximal end of the thrombus removing net of the thrombus removing device 100 is open or the mesh of the proximal end of the thrombus removing net is larger, when the thrombus removing net is withdrawn into the sheath tube 1, the thrombus is easy to escape from the thrombus removing net due to the extrusion of the thrombus removing net and the inner wall of the sheath tube 1, and the trapping net 3 at least partially wraps and is well bonded with the thrombus removing net, so that the problem is well avoided, the mesh of the trapping net 3 can be set smaller than the mesh of the thrombus removing net for improving the effect, and the trapping net 3 can be set thinner for better elastic bonding performance.
In the initial state, the inside of the trapping net 3 is turned over to the outside to form an everting state, the first opening end 4 is turned over inwards and then is relatively fixedly connected to the far end of the trapping pipe 2 to form the far end of the trapping net 3, the trapping net 3 is formed into an everting guide surface 6 near the first opening end 4, the everting guide surface 6 is a conical cambered surface, the near end of the thrombus removing net is convenient to retract into the trapping net 3 and even the sheath pipe 1, the trapping net 3 is further convenient to be turned inwards rapidly and later in the outside to recover, and the second opening end 5 is a free end and forms the near end of the trapping net 3. The collection tube 2 is configured to drive the inside of the collection mesh 3 outside to rapidly turn inwardly along the inversion guide surface 6 to at least partially wrap the thrombolytic device 100, such as completely wrap the proximal end of the thrombolytic mesh of the thrombolytic device 100, after the collection mesh 3 is turned inwardly into place, the first open end 4 forms the proximal end of the collection mesh 3, the second open end 5 forms the distal end of the collection mesh 3, and the collection mesh 3 conforms to the thrombolytic device 100.
Like this, because the entrapment net 3 is the everting state under initial condition and has formed varus guide surface 6, consequently the entrapment net 3 is inwards overturned more easily in order to recover for the entrapment net 3 is more easily overturned in order to wrap up the thrombus taking device 100 at least partially, and the parcel is more smooth and stable, can not appear wrap up the condition that fails, and then can effectively prevent thrombus from escaping in the thrombus taking device 100, so can effectively trap thrombus.
The radial dimension of the trapping net 3 in the expanded state is larger than that of the sheath tube 1, so that when the trapping net 3 is positioned outside the sheath tube 1 and the trapping net 3 can be gradually sleeved on the outer wall of the sheath tube 1 positioned in the blood vessel along the distal end of the sheath tube 1 in the process of moving the trapping tube 2 in the distal end to the proximal direction, the trapping net 3 can be enabled to be turned inwards by abutting the trapping net 3 by the sheath tube 1, and further the trapping net 3 is enabled to be turned inwards more easily, so that the thrombus taking device 100 can be wrapped smoothly.
Here, the sheath 1 can abut against the capturing net 3 to enable the capturing net 3 to turn inwards, as shown in fig. 4, it can be understood that after the capturing net 3 is sleeved on the outer wall of the sheath 1, when the capturing pipe 2 moves in the distal direction, the distal end of the sheath 1 abuts against the first open end 4 of the capturing net 3 to enable the capturing net 3 to turn inwards, or as shown in fig. 3, the capturing net 3 is not sleeved on the outer wall of the sheath 1, the second open end 5 of the capturing net 3 can abut against the sheath 1 (in the case that there is a bend in the sheath 1), so that the capturing net 3 is turned inwards by the distal end 5 of the capturing net 1, that is, in the process that the capturing pipe 2 moves in the distal direction, the second open end 5 of the capturing net 3 abuts against the distal end of the sheath 1, so that the capturing net 3 is not immediately sleeved on the outer wall of the sheath 1, and the capturing net 3 can be gradually turned inwards due to the fact that the second open end 5 abuts against the distal end 4 of the sheath 1, that the capturing net 3 abuts against the distal end 4 of the sheath 1, that is gradually turned inwards, that is, the capturing net 3 abuts against the distal end 4 of the capturing net 1. In order to facilitate the trapping net 3 to be smoothly sleeved at the distal end of the sheath tube 1, the distal end of the sheath tube 1 is set to be a tapered end, so that the trapping net 3 is sleeved on the outer wall of the sheath tube 1 along the tapered end.
The collecting pipe 2 comprises an outer layer 7, an elastic net 8 and an inner layer 9, wherein the outer layer 7, the elastic net 8 and the inner layer 9 are coaxially arranged, the elastic net 8 is positioned 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, bending resistance and tensile property 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 connection strength between the collecting net 3 and the collecting pipe 2 is improved, and of course, the far end of the elastic net 8 can be outwards turned after extending out of the far end of the collecting pipe 2 to form the collecting net 3, so that the collecting net 3 is easy to inwards turn over to recover.
In actual use, as shown in fig. 1, the sheath tube 1 containing the collection tube 2 and the collection net 3 is at least partially inserted into a blood vessel, then the collection tube 2 is pushed in a proximal-distal direction relative to the sheath tube 1, so that the collection net 3 is positioned outside the sheath tube 1 and distal to the sheath tube 1 as shown in fig. 3, then the sheath tube 1 is pushed in a proximal-distal direction relative to the collection tube 2, so that the collection net 3 is sleeved on the sheath tube 1 and the first opening end 4 of the collection net 3 abuts against as shown in fig. 4, and then the thrombus taking device 100 is inserted into the blood vessel through the collection tube 2 to capture thrombus. After the thrombus is captured by the thrombus-removing device 100, the thrombus-removing device 100 is pulled in a distal-to-proximal direction relative to the sheath 1 until the proximal end of the thrombus-removing device 100 contacts the capturing net 3, i.e., the first opening end 4 adjacent to the capturing net 3 is as shown in fig. 7, then the thrombus-removing device 100 and the capturing tube 2 are synchronously pulled in a distal-to-proximal direction (for example, the capturing tube 2 may be synchronously pulled only in a distal-to-proximal direction by first fixing the thrombus-removing device 100 and the capturing tube 2), and then the capturing net 3 is rapidly turned inside out along the inversion guide surface 6 to at least partially wrap the thrombus-removing net of the thrombus-removing device 100, and finally, the thrombus-removing device 100 is withdrawn from the blood vessel by continuing to synchronously pull the thrombus-removing device 100 and the capturing tube 2 in a distal-to-proximal direction relative to the sheath 1 as shown in fig. 8.
It will be appreciated that although the invention has been described above in terms of preferred embodiments, the above embodiments are not intended to limit the invention. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A thrombus-trapping device for assisting in withdrawing a thrombus-taking device, comprising a sheath tube (1), 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-taking device (100) to trap thrombus, the trapping net (3) is provided with a first opening end (4) and a second opening end (5) which are axially opposite, the first opening end (4) is connected with the distal end of the trapping tube (2), and the thrombus-trapping device is characterized in that in an initial state, the trapping net (3) is turned inside to an outwards turned state and sleeved on the outer wall of the sheath tube (1), the first opening end (4) is relatively fixedly connected to the distal end of the trapping tube (2) to form the distal end of the trapping net (3), and the trapping net (3) forms an inwards turned guide surface (6) near the first opening end (4), and the second opening end (5) is a free end and forms the proximal end of the trapping net (3); the collection tube (2) is configured such that when moved in a distal to proximal direction, the sheath (1) forces the collection mesh (3) to be positioned outside inside and to be quickly turned inside along the turned-in guide surface (6) to at least partially wrap the thrombus-removing device (100), after the collection mesh (3) is turned inside in place, the first open end (4) forms a proximal end of the collection mesh (3), and the second open end (5) forms a distal end of the collection mesh (3).
2. The thrombus-trapping device according to claim 1, wherein the sheath (1) abuts against the trapping net (3) during the movement of the trapping tube (2) in the distal-to-proximal direction such that the trapping net (3) is turned inwards.
3. The thrombus-trapping device according to claim 2, wherein the distal end of the sheath (1) abuts the first open end (4) such that the trapping web (3) is turned inwards.
4. A 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-trapping device according to claim 2, wherein said second open end (5) is capable of abutting against the sheath (1), the distal end of the sheath (1) abutting against the second open end (5) causing the trapping web (3) to flip inwards.
6. The thrombus-trapping device according to claim 5, wherein after said second open end (5) abuts against the distal end of the sheath (1), there is a state in which the trapping net (3) is fitted over the sheath (1) along the distal end of the sheath (1) to form an inward-turned state in which the distal end of the sheath (1) abuts against the first open end (4).
7. The thrombus-trapping device according to claim 1, wherein an elastic net (8) is provided in said trapping tube (2), and the first open end (4) is fixedly connected to the distal end of the elastic net (8).
8. The thrombus-trapping device according to claim 7, wherein the distal end of said elastic mesh (8) extends beyond the distal end of the trapping tube (2) and is turned outwards to form the trapping mesh (3).
9. Thrombus-trapping device according to claim 1, characterized in that said varus guide surface (6) is a conical cambered surface.
10. The thrombus-trapping device according to claim 1, wherein the trapping net (3) has a contracted state in which it is contracted radially and an expanded state in which it is expanded radially, the trapping net (3) is in the contracted state when it is positioned inside the sheath (1), the trapping net (3) is in the expanded state when it is positioned outside the sheath (1), and the radial dimension of the trapping net (3) in the expanded state is larger than the radial dimension of the sheath (1).
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| CN202211552926 | 2022-12-06 | ||
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110769766A (en) * | 2017-06-19 | 2020-02-07 | 柯惠有限合伙公司 | Retractor device for converting an acquisition device from a deployment position to a delivery position |
| CN113440217A (en) * | 2021-07-27 | 2021-09-28 | 苏州铨通医疗科技有限公司 | Thrombectomy device and medical device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2498349B (en) * | 2012-01-10 | 2013-12-11 | Cook Medical Technologies Llc | Object capture device |
| US20140276403A1 (en) * | 2013-03-13 | 2014-09-18 | DePuy Synthes Products, LLC | Ischemic stroke device |
| EP3406208B1 (en) * | 2015-09-28 | 2020-01-22 | Stryker Corporation | Mechanical thrombectomy apparatuses |
| EP3509507A1 (en) * | 2016-09-12 | 2019-07-17 | Stryker Corporation | Self-rolling thrombectomy apparatuses and methods |
| US10098651B2 (en) * | 2017-01-10 | 2018-10-16 | Inari Medical, Inc. | Devices and methods for treating vascular occlusion |
| CN110636805B (en) * | 2017-05-12 | 2023-02-10 | 柯惠有限合伙公司 | Removal of material from a vascular lumen |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110769766A (en) * | 2017-06-19 | 2020-02-07 | 柯惠有限合伙公司 | Retractor device for converting an acquisition device from a deployment position to a delivery position |
| CN113440217A (en) * | 2021-07-27 | 2021-09-28 | 苏州铨通医疗科技有限公司 | Thrombectomy device and medical device |
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