Stent implanting system

Abstract

The invention belongs to the technical field of medical instruments, and discloses a stent implantation system which comprises a first catheter, a second catheter and a filter, and the first catheter can be sleeved with a stent; the second guide pipe penetrates through the first guide pipe; the filter penetrates through the second guide pipe and comprises a filter body, and the filter body has a folded state and an unfolded state; in the folding state, the filter body penetrates through the second guide pipe; in the unfolded state, the filter body is located outside the second guide pipe, and the first guide pipe can squeeze and store the unfolded filter body. According to the stent implantation system, plaque escape in the operation process is effectively prevented, and the embolism risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a stent implantation system. Background Art

[0002] The carotid artery is the main artery supplying blood to the brain. When a patient develops carotid artery stenosis due to a variety of clinical factors, the normal blood supply to the brain is reduced, which in turn threatens the normal metabolism of brain cells and increases the patient's risk of stroke.

[0003] In modern medicine, carotid artery stent implantation is often used as the preferred treatment method. The stent is implanted into the patient's diseased site to fully expand the narrow lumen to restore blood flow. It has the advantages of being minimally invasive and having definite short-term efficacy.

[0004] The above-mentioned stenosis often occurs in the carotid bifurcation area, so in most cases, the proximal end of the carotid stent is placed in the common carotid artery and the distal end is placed in the internal carotid artery, and the stent needs to cross the bifurcation at the external carotid artery. Since stent expansion will inevitably cause plaque detachment, if these plaques escape to the internal carotid artery or external carotid artery, the risk of distal embolism will increase. Summary of the invention

[0005] The purpose of the present invention is to provide a stent implantation system to effectively prevent plaque escape and reduce the risk of embolism.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A stent implantation system is provided, comprising:

[0008] a first catheter, on which a stent can be sleeved;

[0009] a second conduit, inserted into the first conduit;

[0010] A filter is disposed in the second conduit, the filter comprising a filter body, and the filter body has a folded shape and an unfolded shape;

[0011] Wherein, in the folded shape, the filter body is inserted into the second conduit;

[0012] In the expanded state, the filter body is located outside the second conduit, and the first conduit can squeeze and accommodate the expanded filter body.

[0013] Optionally, the filter body comprises:

[0014] A first filter screen, wherein the first filter screen is provided with a plurality of first filter holes;

[0015] The second filter screen is located outside the first filter screen and forms an intermediate cavity with the first filter screen. The second filter screen is provided with a plurality of second filter holes.

[0016] Optionally, cutting wires are formed between at least some of the adjacent first filter holes.

[0017] Optionally, the second filter screen comprises a bottom filter section and an inlet filter section which are connected to each other, and the aperture of the second filter holes on the bottom filter section is larger than the aperture of the second filter holes on the inlet filter section.

[0018] Optionally, an annular support is connected to the inlet end of the filter body.

[0019] Optionally, the outer periphery of the annular support is coated with a polymer filter membrane.

[0020] Optionally, the filter further comprises:

[0021] The skeleton comprises an intermediate rod and a plurality of retractable wires, wherein the first end of the intermediate rod is connected to the bottom of the filter body, the second end of the intermediate rod is connected to the first end of the retractable wire, and the second end of the retractable wire is connected to the inlet end of the filter body;

[0022] A guide wire is inserted into the second catheter and connected to the middle rod.

[0023] Optionally, at least one of the two ends of the intermediate rod is connected to a developing ring.

[0024] Optionally, it also includes a sheath, which is sleeved outside the first catheter.

[0025] Optionally, a balloon is provided on the outer periphery of the first catheter, and the stent can be sleeved on the balloon.

[0026] Beneficial effects:

[0027] The stent implantation system provided by the present invention, during surgery, firstly delivers the first catheter to the proximal side of the narrow lumen, and then withdraws the second catheter after passing through the narrow lumen, so that the filter is separated from the second catheter and expanded at the distal side of the narrow lumen, and the expanded filter can fit with the blood vessel wall, effectively preventing the plaque from escaping due to the expansion of the stent; then, continue to deliver the first catheter, so that the stent is located in the narrow lumen, and the stent expands to open the narrow lumen; finally, continue to deliver the first catheter, the first catheter squeezes and stores the expanded filter, effectively preventing the expanded filter from rubbing against the blood vessel wall and the stent, thereby preventing the plaque from falling off, and withdraw the first catheter and the second catheter to complete the surgery.

[0028] Among them, compared with the first catheter, the inner diameter of the second catheter is smaller, and the second catheter is more suitable for passing through a narrow lumen. When the filter body is delivered to the distal side of the narrow lumen, the intrusion into the narrow lumen can be minimized to the greatest extent, effectively preventing plaque shedding.

[0029] Among them, compared with the second catheter, the inner diameter of the first catheter is larger, and the blood vessel opened by the stent is suitable for the first catheter to pass through. The first catheter has a larger internal space, which can smoothly recover the filter body and effectively prevent the filter body from being stuck outside the first catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a stent implantation system provided by the present invention;

[0031] Figure 2 is a schematic structural diagram of a first filter screen provided by the present invention;

[0032] Figure 3 It is a structural schematic diagram of an implementation mode of the filter body provided by the present invention;

[0033] Figure 4 is a structural schematic diagram of another embodiment of the filter body provided by the present invention;

[0034] Figure 5 is a structural schematic diagram of another embodiment of the filter body provided by the present invention;

[0035] Figure 6 It is a partial structural schematic diagram of the stent implantation system provided by the present invention;

[0036] Figure 7 It is a cross-sectional view of the stent implantation system provided by the present invention.

[0037] In the figure:

[0038] 100, first catheter; 110, balloon; 120, filling channel;

[0039] 200, bracket;

[0040] 300, second catheter;

[0041] 400, filter; 410, filter body; 411, first filter screen; 4111, first filter hole; 4112, cutting wire; 412, second filter screen; 4121, second filter hole; 4122, bottom filter section; 4123, inlet filter section; 413, annular support; 414, polymer filter membrane; 420, skeleton; 421, middle rod; 422, retractable wire; 430, guide wire; 440, developing ring;

[0042] 500, sheath; 510, handle. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] Reference Figure 1 As shown, this embodiment provides a stent implantation system, which includes a first catheter 100 , a second catheter 300 and a filter 400 .

[0048] Specifically, the bracket 200 can be sleeved on the first conduit 100; the second conduit 300 is inserted into the first conduit 100; the filter 400 is inserted into the second conduit 300, and the filter 400 includes a filter body 410, and the filter body 410 has a folded shape and an unfolded shape.

[0049] In the folded shape, the filter body 410 is disposed through the second conduit 300 .

[0050] In the expanded state, the filter body 410 is located outside the second duct 300 , and the first duct 100 can squeeze and store the expanded filter body 410 .

[0051] During the operation, the first catheter 100 is first delivered to the proximal side of the narrow lumen, and the second catheter 300 is passed through the narrow lumen of the blood vessel and then the second catheter 300 is withdrawn, so that the filter 400 is separated from the second catheter 300 and expanded at the distal side of the narrow lumen. The expanded filter 400 can fit with the blood vessel wall, effectively preventing the plaque from escaping due to the expansion of the stent 200; then, the first catheter 100 is continued to be delivered, so that the stent 200 is located in the narrow lumen, and the stent 200 expands to open the narrow lumen; finally, the first catheter 100 is continued to be delivered, and the first catheter 100 squeezes and stores the expanded filter 400, effectively preventing the expanded filter 400 from rubbing against the blood vessel wall and the stent 200, thereby preventing the plaque from falling off, and the first catheter 100 and the second catheter 300 are withdrawn to complete the operation. In addition, the stent 200 can be delivered through the first catheter 100, and the operation is completed through the stent implantation system, which can effectively reduce the number of surgical instrument exchanges in the patient's body and reduce surgical risks and costs.

[0052] It can be understood that compared with the first catheter 100, the inner diameter of the second catheter 300 is smaller, and the second catheter 300 is more suitable for passing through a narrow lumen. When the filter body 410 is delivered to the distal side of the narrow lumen, the intrusion into the narrow lumen can be minimized to the greatest extent, effectively preventing plaque detachment.

[0053] It can be understood that compared with the second catheter 300, the inner diameter of the first catheter 100 is larger, the blood vessel opened by the stent 200 is suitable for the first catheter 100 to pass through, and the first catheter 100 has a larger internal space, which can smoothly recover the filter body 410, effectively preventing the filter body 410 from getting stuck outside the first catheter 100.

[0054] Exemplarily, when the second catheter 300 is withdrawn and the filter body 410 is separated from the distal end of the second catheter 300, the filter body 410 can be expanded by self-expansion. The distal end of the second catheter 300 refers to the end extending into the blood vessel, and the proximal end of the second catheter 300 is the opposite end of the distal end. In addition, the definition of the proximal end and the distal end of other components in this embodiment is the same as that of the proximal end and the distal end of the second catheter 300, and this application will not be repeated in detail.

[0055] Exemplarily, the stent 200 may be a self-expanding braided carotid stent with a dense mesh, which can prevent plaques from escaping from the mesh of the stent 200 and reduce the risk of embolism.

[0056] Illustratively, in the collapsed state, the filter body 410 is disposed within the distal end of the second conduit 300 .

[0057] In this embodiment, refer to Figures 2 to 5 As shown, the filter body 410 includes a first filter screen 411 and a second filter screen 412, the first filter screen 411 is provided with a plurality of first filter holes 4111, the second filter screen 412 is located outside the first filter screen 411 and forms an intermediate cavity with the first filter screen 411, and the second filter screen 412 is provided with a plurality of second filter holes 4121. In this embodiment, the two layers of filter screens can better intercept plaques and prevent plaques from escaping, and the intermediate cavity is formed between the first filter screen 411 and the second filter screen 412, which can ensure that blood flows smoothly through the filter body 410.

[0058] Exemplarily, the inlet end of the second filter screen 412 is connected to the outer periphery of the first filter screen 411 .

[0059] Exemplarily, the first filter 411 and the second filter 412 can both be made of memory alloy materials, including but not limited to nickel-titanium alloy, titanium alloy and other alloy materials with shape memory properties and sufficient strength, that is, the first filter 411 and the second filter 412 can be unfolded simultaneously.

[0060] Exemplarily, the first filter screen 411 and the second filter screen 412 include but are not limited to being woven from braided wire or laser engraved. Preferably, the first filter screen 411 is woven from braided wire. Preferably, the second filter screen 412 is laser engraved.

[0061] Exemplarily, the unfolded shape of the first filter screen 411 may be set to be a cone.

[0062] Exemplarily, the axial length of the first filter screen 411 along the filter body 410 may be set to 5 mm-15 mm.

[0063] Exemplarily, the expanded shape of the second filter screen 412 may be set to be a cone.

[0064] Exemplarily, the axial length of the second filter screen 412 along the filter body 410 may be set to 7 mm-17 mm;

[0065] Exemplarily, the aperture of the first filter hole 4111 is larger than the aperture of the second filter hole 4121. When the first filter hole 4111 is a non-circular hole, the aperture of the first filter hole 4111 refers to the diameter of the inscribed circle of the first filter hole 4111; when the second filter hole 4121 is a non-circular hole, the aperture of the second filter hole 4121 refers to the diameter of the inscribed circle of the second filter hole 4121. It can be understood that a larger plaque is intercepted by the first filter 411, and a smaller plaque can flow through the first filter 411 and be intercepted by the second filter 412, which can effectively avoid the drawback of the single-layer filter of the existing product being blocked, effectively ensure that the blood flows smoothly through the filter body 410, and effectively prevent the occurrence of stroke caused by a smaller plaque.

[0066] Exemplarily, the pore size of the first filter hole 4111 can be set to 100um-120um.

[0067] Exemplarily, the pore size of the second filter hole 4121 can be set to 40um-100um.

[0068] Exemplarily, the shape of the first filter hole 4111 includes but is not limited to a circle, a rectangle or a diamond.

[0069] Exemplarily, the shape of the second filter hole 4121 includes but is not limited to a circle, a rectangle or a diamond.

[0070] In this embodiment, the shape of the first filter hole 4111 is preferably a rhombus, and the shape of the second filter hole 4121 is preferably a circle.

[0071] In a feasible embodiment, cutting wires 4112 are formed between at least some adjacent first filter holes 4111. The cutting wires 4112 can split the plaques intercepted by the first filter 411 to prevent the first filter 411 from being excessively blocked by the plaques, thereby ensuring that blood flows smoothly through the first filter 411. The second filter 412 can intercept the split plaques to prevent the plaques from escaping.

[0072] In a feasible implementation, the second filter screen 412 includes a bottom filter section 4122 and an inlet filter section 4123 which are connected to each other, and the aperture of the second filter hole 4121 on the bottom filter section 4122 is larger than the aperture of the second filter hole 4121 on the inlet filter section 4123. The bottom filter section 4122 is located at the distal end of the second filter screen 412, and the inlet filter section 4123 is located at the proximal end of the second filter screen 412. In this embodiment, most of the blood in the middle cavity will flow through the second filter hole 4121 on the bottom filter section 4122, and the aperture of the second filter hole 4121 on the bottom filter section 4122 is larger than the aperture of the second filter hole 4121 on the inlet filter section 4123, which can ensure that the blood flows smoothly through the bottom filter section 4122. In addition, the aperture of the second filter hole 4121 on the inlet filter segment 4123 is designed to be smaller than the aperture of the second filter hole 4121 on the bottom filter segment 4122, so that plaque is not easy to block the second filter hole 4121 on the inlet filter segment 4123. Even if the second filter hole 4121 of the bottom filter segment 4122 is blocked, blood can be guaranteed to flow smoothly through the second filter 412.

[0073] Exemplarily, the axial length of the inlet filter segment 4123 along the filter body 410 can be set to 3 mm-8 mm.

[0074] Preferably, the pore size of the second filter hole 4121 of the bottom filter section 4122 is set to 40um-80um, which can effectively prevent the plaque from escaping.

[0075] Exemplarily, the difference between the pore size of the second filter hole 4121 of the bottom filter section 4122 and the pore size of the inlet filter section 4123 may be greater than or equal to 20 um.

[0076] In a possible implementation, Figures 3 to 5 As shown, the inlet end of the filter body 410 is connected to an annular support member 413, which can fit against the blood vessel wall to play an anchoring role, thereby ensuring that the filter body 410 is in a good expanded state and effectively preventing plaques from escaping from the gap between the inlet end of the filter body 410 and the blood vessel wall.

[0077] In this embodiment, if the axial length of the annular support member 413 along the filter body 410 is too long, it will occupy the effective filtering length of the filter body 410, and if it is too short, it will be difficult to form a stable anchoring effect in the blood vessel. Exemplarily, the axial length of the annular support member 413 and the filter body 410 can be set to 3mm-10mm. Preferably, the axial length of the annular support member 413 and the filter body 410 is set to 5mm.

[0078] For example, the annular support member 413 may be in a mesh shape, similar to a stent structure. The annular support member 413 may be formed by laser cutting or braiding. If braiding is used, it needs to be densely woven, and the mesh number may be set to 80-150. The dense mesh weaving enables the annular support member 413 to have a better support effect, preventing the mesh from causing compression damage to the blood vessel wall. For example, Figure 4 As shown, the annular support member 413 can be set as a basket mesh structure. On the one hand, the basket mesh structure can be stably anchored on the blood vessel wall after expansion, and on the other hand, the basket mesh structure can also capture plaques. Of course, the annular support member 413 can also be set as a circular ring structure or other shapes.

[0079] Exemplarily, the annular support member 413 may be integrally formed with the first filter screen 411 or the second filter screen 412 .

[0080] In a possible implementation, Figure 5 As shown, the outer periphery of the annular support 413 is coated with a polymer filter membrane 414. The annular support 413 adheres to the blood vessel wall through the polymer filter membrane 414, which can reduce the pressure on the blood vessel wall, and the polymer filter membrane 414 can also prevent plaques from escaping.

[0081] In this embodiment, refer to Figure 1 , Figure 6 and Figure 7 As shown, the filter 400 also includes a skeleton 420 and a guide wire 430. The skeleton 420 includes an intermediate rod 421 and a plurality of retractable wires 422. The first end of the intermediate rod 421 is connected to the bottom of the filter body 410, the second end of the intermediate rod 421 is connected to the first end of the retractable wire 422, and the second end of the retractable wire 422 is connected to the inlet end of the filter body 410. The guide wire 430 is passed through the second conduit 300 and is connected to the intermediate rod 421.

[0082] In some embodiments, when the first catheter 100 moves toward the expanded filter body 410, the filter body 410 can be supported by the middle rod 421, and the first catheter 100 can squeeze the retractable wire 422 to pull the expanded filter body 410 toward the folded state, thereby making the filter body 410 suitable for entering the first catheter 100.

[0083] In some embodiments, while the first catheter 100 is moving toward the expanded filter body 410 , the second catheter 300 can be moved toward the filter body 410 . The second catheter 300 squeezes the retractable wire 422 to make the filter body 410 more suitable for being received by the first catheter 100 .

[0084] In a feasible implementation manner, at least one of the two ends of the middle rod 421 is connected to a developing ring 440 for X-ray developing marking to ensure the success rate and safety of the operation.

[0085] In a feasible embodiment, the stent implantation system further includes a sheath 500, which is sleeved outside the first catheter 100. During the operation, under the guidance of X-rays, the guide wire 430 (not shown) can be first delivered to the narrow lumen, and then the sheath 500 can be sleeved on the guide wire 430. Under the guidance of the guide wire 430, the sheath 500 is delivered to the proximal side of the narrow lumen. After the guide wire 430 is withdrawn, the first catheter 100 can be inserted into the sheath 500. Under the guidance of the sheath 500, the first catheter 100 is delivered to the proximal side of the narrow lumen. After the filter 400 is deployed at the distal side of the narrow lumen, the sheath 500 and the first catheter 100 can be passed through the narrow lumen together, and then the sheath 500 can be withdrawn to allow the stent 200 to detach from the sheath 500 and expand to open the narrow lumen.

[0086] Specifically, a handle 510 is connected to the proximal end of the sheath 500 to facilitate the manipulation of the stent implantation system.

[0087] In a feasible implementation, a balloon 110 is provided on the outer periphery of the first catheter 100, and a stent 200 can be sleeved on the balloon 110. After the stent 200 expands and opens the narrow lumen, the balloon 110 can be filled, and the stent 200 can better fit the narrow lumen under the compression of the balloon 110, further expanding the narrow lumen, and can reduce the number of surgical instrument exchanges in the patient's body, thereby reducing surgical risks and costs.

[0088] Specifically, a filling channel 120 communicating with the balloon 110 is provided on the first catheter 100 , and the extracorporeal device can inject filling liquid into the balloon 110 through the filling channel 120 to achieve filling of the balloon 110 .

[0089] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A stent implantation system, characterized in that: include: A first catheter (100), on which a stent (200) can be sleeved; A second conduit (300) is disposed inside the first conduit (100); A filter (400) is disposed through the second conduit (300), wherein the filter (400) comprises a filter body (410), and the filter body (410) has a folded shape and an unfolded shape; Wherein, in the folded state, the filter body (410) is inserted into the second conduit (300); In the expanded state, the filter body (410) is located outside the second duct (300), and the first duct (100) can squeeze and accommodate the expanded filter body (410).

2. The stent implantation system according to claim 1, characterized in that: The filter body (410) comprises: A first filter screen (411), wherein the first filter screen (411) is provided with a plurality of first filter holes (4111); The second filter screen (412) is located outside the first filter screen (411) and forms an intermediate cavity between the second filter screen (411) and the first filter screen (411). The second filter screen (412) is provided with a plurality of second filter holes (4121).

3. The stent implantation system according to claim 2, characterized in that: A cutting wire (4112) is formed between at least some of the adjacent first filter holes (4111).

4. The stent implantation system according to claim 2, characterized in that: The second filter screen (412) comprises a bottom filter section (4122) and an inlet filter section (4123) which are connected to each other, and the aperture of the second filter hole (4121) on the bottom filter section (4122) is larger than the aperture of the second filter hole (4121) on the inlet filter section (4123).

5. The stent implantation system according to claim 1, characterized in that: The inlet end of the filter body (410) is connected to an annular support member (413).

6. The stent implantation system according to claim 5, characterized in that: The outer periphery of the annular support member (413) is coated with a polymer filter membrane (414).

7. The stent implantation system according to claim 1, characterized in that: The filter (400) further comprises: A skeleton (420) comprises an intermediate rod (421) and a plurality of retractable wires (422), wherein a first end of the intermediate rod (421) is connected to the bottom of the filter body (410), a second end of the intermediate rod (421) is connected to a first end of the retractable wires (422), and a second end of the retractable wires (422) is connected to an inlet end of the filter body (410); The guide wire (430) is inserted into the second catheter (300) and connected to the middle rod (421).

8. The stent implantation system according to claim 7, characterized in that: At least one of the two ends of the intermediate rod (421) is connected to a developing ring (440).

9. The stent implantation system according to claim 1, characterized in that: It also includes a sheath (500), and the sheath (500) is sleeved outside the first catheter (100).

10. The stent implantation system according to any one of claims 1 to 9, characterized in that: A balloon (110) is provided on the outer periphery of the first catheter (100), and the stent (200) can be sleeved on the balloon (110).

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