An embolization device

Abstract

The present invention relates to the field of medical device technology, and specifically to an embolization device, comprising: an elastic body having a hollow cavity; a guide wire, one end of which passes through the interior of the elastic body and is connected to the head end of the elastic body, and the other end of the guide wire extends out of the elastic body; an adjustment structure, arranged in the hollow cavity, comprising a limiter connected to the tail end of the elastic body and a clamping member arranged on the guide wire and close to the head end of the elastic body, and the guide wire is pulled to drive the clamping member to move toward the limiter and be clamped and fixed at a corresponding position of the limiter to change the shape of the elastic body; the technical solution of the present application changes the shape of the elastic body by pulling the guide wire to adapt to aneurysms of different shapes and sizes, weakens the effect of blood flow dynamics on the aneurysm cavity, realizes blood vessel repair and reconstruction, and thus effectively treats aneurysms; and the shape of the elastic body is conveniently fixed by clamping and fixing it on the limiter through the clamping member.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an embolization device. Background Art

[0002] Aneurysms are abnormal bulges formed by gradual expansion of the arterial wall due to local damage to the vessel wall caused by congenital abnormalities or acquired injuries, under the action of hemodynamic load and other factors. Patients with wide-necked bifurcated aneurysms have an increased risk of sudden and potentially fatal bleeding from the aneurysms due to increased arterial flow and pressure. The main goal of treating wide-necked bifurcated aneurysms is to prevent rupture and related morbidity and mortality. Currently, the interventions available for wide-necked bifurcated aneurysms include open surgical clipping and endovascular interventional therapy. Open surgical clipping will bring huge trauma and infection risks to patients, and the incidence of postoperative complications is high. Currently, common endovascular interventional treatments include single coil embolization, balloon-assisted coil embolization, stent-assisted coil embolization, and implantable intravascular devices (such as stents and blood flow diversion devices). The above methods for treating wide-necked bifurcated aneurysms will bring more complications, high recurrence rates, and require patients to receive dual antiplatelet therapy.

[0003] However, the shape and size of the embolization in the above treatment methods are relatively fixed, and it is difficult to adapt to aneurysms of different shapes and sizes. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the embolization in the prior art is difficult to adapt to aneurysms of different shapes and sizes. Based on the above situation, it is necessary to develop an embolization device with adjustable size.

[0005] In order to achieve the above object, the present invention provides an embolization device, comprising:

[0006] An elastic body having a hollow cavity;

[0007] A guide wire, one end of which passes through the interior of the elastic body and is connected to the head end of the elastic body, and the other end of the guide wire extends out of the elastic body;

[0008] The adjustment structure is arranged in the hollow cavity, and includes a limiting piece connected to the tail end of the elastic body and a clamping piece arranged on the guide wire and close to the head end of the elastic body. The guide wire is pulled to drive the clamping piece to move toward the limiting piece and be clamped and fixed at the corresponding position of the limiting piece to change the shape of the elastic body.

[0009] Optionally, the limiting member is a cylinder, and the clamping members are multiple and spaced apart on the guide wire. A limiting structure is provided on the head end of the cylinder facing the elastic body, and the limiting structure is provided with a through hole that allows the clamping member to pass through and be clamped inside the cylinder.

[0010] Optionally, a plurality of spaced slots arranged in a radial direction are provided on the limiting structure, and an inner diameter of the through hole is smaller than a maximum length of a projection of the clamping member in a direction perpendicular to the axial direction of the guide wire.

[0011] Optionally, the limiting structure is a conical cylinder, and the through hole is arranged at the small head end of the conical cylinder.

[0012] Optionally, a diameter of a portion of the guide wire located within the elastic body is smaller than a diameter of another portion extending to the outside of the elastic body.

[0013] Optionally, an elastic member is connected between the head end of the elastic body and the guide wire.

[0014] Optionally, it also includes:

[0015] The fixing structure is arranged at the rear end of the elastic body and is arranged corresponding to the limiting member.

[0016] Optionally, a developing assembly is provided on both the elastic body and the fixed structure.

[0017] Optionally, it also includes:

[0018] The introduction sheath is sleeved on the outside of the elastic body and the fixed structure.

[0019] Optionally, it also includes:

[0020] A release device connected to one end of the guide wire extending out of the introduction sheath;

[0021] A separation point is provided on the guide wire on one side of the holding member close to the tail end of the elastic body;

[0022] When the release device is energized, the guidewire is disconnected at the separation point.

[0023] The above technical solution of the present invention has the following advantages compared with the prior art:

[0024] 1. The embolization device provided by the present invention comprises: an elastic body having a hollow cavity; a guide wire, one end of which passes through the interior of the elastic body and is connected to the head end of the elastic body, and the other end of the guide wire extends out of the elastic body; an adjustment structure, which is arranged in the hollow cavity, and comprises a limiter connected to the tail end of the elastic body and a clamping member arranged on the guide wire and close to the head end of the elastic body, and the guide wire is pulled to drive the clamping member to move toward the limiter and be clamped and fixed at a corresponding position of the limiter to change the shape of the elastic body; the technical solution of the present application changes the shape of the elastic body by pulling the guide wire to adapt to aneurysms of different shapes and sizes, weaken the effect of blood flow dynamics on the aneurysm cavity, and achieve blood vessel repair and reconstruction, thereby effectively treating aneurysms; and the guide wire is clamped and fixed to the limiter by the clamping member to conveniently fix the shape of the elastic body.

[0025] 2. The limiting member described in the present invention is a cylinder, and the clamping members are multiple and are arranged at intervals on the guide wire. The cylinder is provided with a limiting structure on the side of the head end facing the elastic body, and the limiting structure is provided with a through hole allowing the clamping member to pass through and be clamped inside the cylinder. The technical solution of this application defines the specific structure of the limiting member, and by providing multiple clamping members, different clamping members are clamped in the through hole, and the guide wire is pulled by different distances to change the shape of the elastic body, so that the elastic body can easily adapt to the shape of the aneurysm.

[0026] 3. The present invention provides a plurality of spaced radially arranged slots on the limiting structure, and the inner diameter of the through hole is smaller than the maximum length of the projection of the clamping piece in the direction perpendicular to the axial direction of the guide wire; the technical solution of the present application facilitates the passage of the clamping piece through the limiting structure by providing the slots; and ensures that the clamping piece is reliably clamped and fixed in the through hole by limiting the relationship between the inner diameter of the through hole and the maximum length of the clamping piece.

[0027] 4. The limiting structure described in the present invention is a conical cylinder, and the through hole is arranged at the small head end of the conical cylinder; this application adopts the above technical solution, and specifically limits the form of the limiting structure to a conical cylinder, which plays a certain guiding role for the clamping part to pass through the through hole.

[0028] 5. The diameter of the portion of the guide wire located inside the elastic body of the present invention is smaller than the diameter of the other portion extending to the outside of the elastic body; the present application sets different diameters for the guide wires, and the guide wire located inside the elastic body adopts a smaller diameter, which can not only fix the clamping part, but also has a certain flexibility and can smoothly pass through the limiter; the guide wire located outside the elastic body adopts a larger diameter, which can not only ensure the transportation of the elastic body, but also has a certain strength.

[0029] 6. The present invention connects and arranges an elastic member between the head end of the elastic body and the guide wire; by arranging the elastic member, the blood pressure in the aneurysm applies pressure to the elastic body as a whole, and the elastic member is also affected by the above pressure, pushing the elastic member to compress or stretch, thereby pulling or pushing the head end of the elastic body, so that the elastic body can adapt to the shape and size of the aneurysm.

[0030] 7. The embolization device provided by the present invention further includes: a fixing structure, which is arranged at the tail end of the elastic body and is arranged corresponding to the limiting member; the present application adopts the above technical solution and sets a fixing structure at the tail end of the elastic body to reliably fix the elastic body.

[0031] 8. The present invention provides a developing assembly on both the elastic body and the fixed structure; the present application adopts the above technical solution, and by providing the developing assembly, the position of the elastic body and the fixed structure in the blood vessel and aneurysm can be easily seen.

[0032] 9. The embolization device provided by the present invention also includes: an introduction sheath, which is sleeved on the outside of the elastic body and the fixed structure; the present application adopts the above technical solution, and by setting the introduction sheath, it plays a certain protective role on the elastic body and the fixed structure; and it is convenient to connect with the microcatheter to deliver the elastic body into the aneurysm.

[0033] 10. The embolization device provided by the present invention also includes: a release device, which is connected to the end of the guide wire extending out of the introduction sheath; a separation point is arranged on the guide wire on the side of the clamping part close to the tail end of the elastic body; when the release device is energized, the guide wire is disconnected at the separation point; the present application adopts the above technical solution to conveniently disconnect the guide wire at the separation point, so as to conveniently separate the elastic body and the guide wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 Schematic diagram of the cross-sectional structure of the embolization device provided in an embodiment of the present invention Figure 1 ;

[0036] Figure 2 Schematic diagram of the cross-sectional structure of the embolization device provided in an embodiment of the present invention Figure 2 ;

[0037] Figure 3It is a schematic diagram of the side structure of the limiter provided in an embodiment of the present invention;

[0038] Figure 4 A schematic cross-sectional view of a position limiting member provided in an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of the cross-sectional structure of the embolization device provided in an embodiment of the present invention located in an aneurysm Figure 1 ;

[0040] Figure 6 for Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0041] Figure 7 Schematic diagram of the cross-sectional structure of the embolization device provided in an embodiment of the present invention located in an aneurysm Figure 2 ;

[0042] Figure 8 for Figure 7 A schematic diagram of the local enlarged structure at B in the middle;

[0043] Fig. 9 Schematic diagram of the cross-sectional structure of the embolization device provided in an embodiment of the present invention located in an aneurysm Figure 3 ;

[0044] Fig.10 for Fig. 9 A schematic diagram of the local enlarged structure at C in the middle;

[0045] Fig.11 The structure of the clamp provided in the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0046] Fig.12 The structure of the clamp provided in the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0047] Fig.13 The structure of the clamp provided in the embodiment of the present invention is schematically shown in FIG. Figure 3 ;

[0048] Fig.14 The structure of the clamp provided in the embodiment of the present invention is schematically shown in FIG. Figure 4 ;

[0049] Fig.15 The structure of the clamp provided in the embodiment of the present invention is schematically shown in FIG. Figure 5

[0050] Fig.16 It is a schematic cross-sectional structure diagram of the embolization device provided in an embodiment of the present invention being delivered to an aneurysm.

[0051] Description of reference numerals:

[0052] 1. Head end; 2. Clamping piece; 3. Elastic piece; 4. Separation point; 5. Elastic body; 6. Limiting piece; 7. Fixing structure; 8. Microcatheter; 9. Guide wire; 10. Release device; 11. Slot; 12. Introduction sheath. DETAILED DESCRIPTION

[0053] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0057] like Figures 1 to 15 A specific embodiment of the embolization device shown is used for embolization of aneurysms, especially for embolization of wide-necked bifurcation aneurysms, including: an elastic body 5 with a hollow cavity, a guide wire 9 passing through the inside of the elastic body 5, an adjustment structure arranged in the hollow cavity, a fixing structure 7 arranged at the tail end of the elastic body 5, an introduction sheath 12 sleeved on the outside of the elastic body 5 and the fixing structure 7, a releaser 10 connected to one end of the guide wire 9 extending out of the introduction sheath 12, and an elastic member 3 arranged between the head end 1 of the elastic body 5 and the guide wire 9.

[0058] like Figure 1 and Figure 2 As shown, the elastic body 5 is a mesh structure woven by multiple strands of high elastic alloy wires; one end of the guide wire 9 is connected to the head end 1 of the elastic body 5, and the other end of the guide wire 9 extends out of the elastic body 5. The adjustment structure includes a limiter 6 connected to the tail end of the elastic body 5 and a clamping member 2 provided on the guide wire 9 and close to the head end of the elastic body 5. Pulling the guide wire 9 drives the clamping member 2 to move toward the limiter 6 and is clamped and fixed at the corresponding position of the limiter 6 to change the shape and size of the elastic body 5. The diameter of the part of the guide wire 9 located in the elastic body 5 is smaller than the diameter of the other part extending to the outside of the elastic body 5. An elastic member 3 is connected and arranged between the head end 1 of the elastic body 5 and the guide wire 9, and specifically, the elastic member 3 is a spring. The fixed structure 7 is arranged corresponding to the limiter 6. A developing assembly is provided on both the elastic body 5 and the fixed structure 7, and specifically, the developing assembly is a developing ring. A separation point 4 is provided on the guide wire 9 at one side of the clamping member 2 close to the rear end of the elastic body 5 ; when the release device 10 is energized, the guide wire 9 is disconnected at the separation point 4 .

[0059] like Figure 1 , Figure 3 and Figure 4 As shown, the limiting member 6 is a cylinder, the clamping members 2 are four arranged at intervals on the guide wire 9, the cylinder is provided with a limiting structure on the head end side facing the elastic body 5, and the limiting structure is provided with a through hole that allows the clamping member 2 to pass through and be clamped inside the cylinder. The limiting structure is provided with three slots 11 arranged in the radial direction at intervals, and the inner diameter of the through hole is smaller than the maximum length of the projection of the clamping member in the axial direction perpendicular to the guide wire 9. The limiting structure is a conical cylinder, and the through hole is provided at the small head end of the conical cylinder.

[0060] like Figures 5 to 10 As shown, when the guide wire 9 is pulled in the direction away from the head end 1 of the elastic body 5, the size of the elastic body 5 along the length direction of the guide wire 9 decreases, while the size in the direction perpendicular to the length direction of the guide wire 9 increases; when the guide wire 9 is pushed in the direction close to the head end 1 of the elastic body 5, the size of the elastic body 5 along the length direction of the guide wire 9 increases, while the size in the direction perpendicular to the length direction of the guide wire 9 decreases. The deformation size of the elastic body 5 is adjusted by changing the number of the clamping members 2 entering the barrel. The more the number of the clamping members 2 entering the barrel, the greater the deformation of the elastic body 5. The elastic member 3 fine-tunes the shape and size of the elastic body 5.

[0061] like Figures 11 to 15 As shown, the shape of the clamping member 2 is a sphere, a cylinder, a truncated cone, a cone or two strips arranged relatively inclined.

[0062] like Figure 2 and Fig.16 As shown, the use process of the embolization device of the present invention is briefly described as follows:

[0063] First, the introduction sheath 12 is docked with the microcatheter 8, and the elastic body 5 and the fixed structure 7 in the introduction sheath 12 are pushed into the microcatheter 8; then, the elastic body 5 is transported to the aneurysm through the blood vessel through the guide wire 9; the transport position is observed through the developing rings on the elastic body 5 and the fixed structure 7; when the elastic body 5 reaches the aneurysm, the guide wire 9 is pulled outward to change the shape and size of the elastic body 5, and the developing rings on the elastic body 5 and the fixed structure 7 are observed. When the shape and size of the elastic body 5 basically adapt to the shape and size of the aneurysm, the release device 10 is energized, and the guide wire 9 is disconnected at the separation point 4; the disconnected guide wire 9 is pulled out. The elastic member 3 fine-tunes the shape and size of the elastic body 5.

[0064] As an alternative embodiment, the clamping member 2 is provided as one, and a plurality of spaced limiting structures are provided on the limiting member 6. The shape and size of the elastic body 5 can be adjusted by changing the positions of the clamping member 2 and the limiting structures.

[0065] As an alternative embodiment, the elastic body 5 is a hollow elastic colloid.

[0066] As an alternative embodiment, the limiting structure of the cylinder is an elastic membrane, and the inner diameter of the through hole on the limiting structure is slightly smaller than the diameter of the spherical clamping member 2, so that the clamping member 2 can pass through the through hole of the elastic membrane under the drive of the guide wire 9 and be clamped behind the elastic membrane.

[0067] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. An embolization device, characterized in that: include: An elastic body (5) having a hollow cavity; A guide wire (9), one end of which passes through the interior of the elastic body (5) and is connected to the head end (1) of the elastic body (5), and the other end of the guide wire (9) extends out of the elastic body (5); The adjusting structure is arranged in the hollow cavity, and comprises a limiting member (6) connected to the tail end of the elastic body (5) and a clamping member (2) arranged on the guide wire (9) and close to the head end of the elastic body (5). The guide wire (9) is pulled to drive the clamping member (2) to move toward the limiting member (6) and be clamped and fixed at the corresponding position of the limiting member (6) to change the shape of the elastic body (5).

2. The embolization device according to claim 1, characterized in that: The limiting member (6) is a cylinder, and the clamping members (2) are multiple and are arranged at intervals on the guide wire (9). A limiting structure is provided on the side of the cylinder facing the head end of the elastic body (5), and the limiting structure is provided with a through hole that allows the clamping member (2) to pass through and be clamped inside the cylinder.

3. The embolization device according to claim 2, characterized in that: The limiting structure is provided with a plurality of slots (11) spaced apart and arranged in a radial direction, and the inner diameter of the through hole is smaller than the maximum length of the projection of the clamping member (2) in a direction perpendicular to the axial direction of the guide wire (9).

4. The embolization device according to claim 3, characterized in that: The limiting structure is a cone cylinder, and the through hole is arranged at the small end of the cone cylinder.

5. The embolization device according to any one of claims 1 to 4, characterized in that: The diameter of the portion of the guide wire (9) located inside the elastic body (5) is smaller than the diameter of the other portion extending to the outside of the elastic body (5).

6. The embolization device according to any one of claims 1 to 4, characterized in that: An elastic member (3) is connected between the head end (1) of the elastic body (5) and the guide wire (9).

7. The embolization device according to claim 5, characterized in that: Also includes: The fixing structure (7) is arranged at the rear end of the elastic body (5) and is arranged corresponding to the limiting member (6).

8. The embolization device according to claim 7, characterized in that: A developing assembly is provided on both the elastic body (5) and the fixed structure (7).

9. The embolization device according to claim 7, characterized in that: Also includes: The introduction sheath tube (12) is sleeved on the outside of the elastic body (5) and the fixing structure (7).

10. The embolization device according to claim 9, characterized in that: Also includes: A release device (10) connected to one end of the guide wire (9) extending out of the introduction sheath (12); A separation point (4) is provided on the guide wire (9) on one side of the holding member (2) close to the rear end of the elastic body (5); When the release device (10) is energized, the guide wire (9) is disconnected at the separation point (4).

Images