Thrombolysis stent

Abstract

The thrombolysis support comprises a support body capable of being opened or contracted, a filtering and intercepting structure capable of being opened or contracted, an outer catheter and an inner core tube, the support body is formed by weaving hollow metal wires, and each metal wire is provided with a medicine feeding hole communicated with an inner cavity of the metal wire. One end of the outer catheter is connected with one end of the stent main body, a flow channel communicated with an inner cavity of the metal wire is arranged in the outer catheter, the filtering and intercepting structure is arranged at the other end of the stent main body, the inner core tube is arranged in the middle of the stent main body in a penetrating mode, one end of the inner core tube penetrates through the outer catheter, and the other end of the inner core tube penetrates through the outer catheter. The other end of the inner core tube is connected with the other end of the stent body, and one end of the outer catheter is connected with the filtering and intercepting structure through a supporting wire. The thrombus thrombolysis device has the advantages of being simple and reasonable in structural design, capable of effectively conducting thrombolysis on thrombus, intercepting and capturing small thrombus broken particles after thrombolysis, preventing the broken particles from being accumulated again to form thrombus, and good in thrombolysis effect.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a thrombolytic stent. Background Art

[0002] The main operation method of arterial thrombolysis is as follows: After local anesthesia of the patient, a catheter and a guide wire are inserted into the femoral artery until the aorta of the patient. After angiography at the aortic arch, the responsible occluded blood vessel is found, and then a thrombolytic drug is injected for super-selective thrombolysis. The thrombolytic drug is generally alteplase, and the dosage is 1 / 3 of that of intravenous thrombolysis. Compared with intravenous thrombolysis, arterial thrombolysis has the advantages of a longer thrombolysis time window and a smaller drug dosage.

[0003] However, when thrombolysis is performed in the above manner, it is necessary to block the distal small blood vessels, which requires a lot of different types of equipment, and the surgical process is relatively complex. At the same time, the blood vessels cannot be dilated simultaneously, and the fine thrombus particles formed after thrombolysis cannot be effectively intercepted and captured, and are likely to accumulate again in the blood vessels to form new thrombi. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a thrombolytic stent, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the utility model for solving the above technical problem is as follows:

[0006] A thrombolytic stent includes an expandable or contractible stent body, an expandable or contractible filtering and intercepting structure, an outer catheter and an inner core tube. The stent body is formed by weaving hollow metal wires, and each metal wire is provided with a drug delivery hole communicating with its inner cavity. One end of the outer catheter is connected to one end of the stent body, and a flow channel communicating with the inner cavity of the metal wire is provided in the outer catheter. The inner core tube passes through the middle of the stent body, one end of the inner core tube passes through the outer catheter, the other end passes through the other end of the stent body, and is connected with a blocking joint. The filtering and intercepting structure is installed on the blocking joint, and the other end of the stent body is connected to the filtering and intercepting structure through a support wire.

[0007] On the basis of the above technical solution, the utility model can be further improved as follows.

[0008] Further, both ends of each metal wire converge at both ends of the stent body and form a columnar connecting part, and the connecting part at the other end of the stent body is connected to the filtering and intercepting structure through the support wire.

[0009] Further, the filtering and intercepting structure is in an umbrella shape after being opened, and its umbrella opening faces one end of the stent body

[0010] Further, the above-mentioned filtering and intercepting structure is a polymer material film layer.

[0011] Further, the above-mentioned filtering and intercepting structure is a wire woven mesh.

[0012] Further, the above-mentioned filtering and intercepting structure is a wire woven mesh of nitinol alloy wire.

[0013] Further, the above-mentioned wire is a nitinol alloy wire.

[0014] The beneficial effects of the present utility model are as follows: the structure design is simple and reasonable, which can effectively dissolve thrombus, and intercept and capture the fine thrombus particles after thrombolysis, avoiding the re-accumulation of the particles to form thrombus, and the thrombolysis effect is better. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the thrombolytic stent of the present utility model.

[0016] In the drawings, the list of components represented by each reference numeral is as follows:

[0017] 1. Stent body; 2. Filtering and intercepting structure; 3. Outer catheter; 4. Inner core tube; 11. Connecting part; 31. Support wire. Specific Embodiments

[0018] The principles and features of the present utility model will be described below in conjunction with the drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0019] Example: As Figure 1 shown, the thrombolytic stent of this embodiment includes a stent body 1 that can be opened or contracted, a filtering and intercepting structure 2 that can be opened or contracted, an outer catheter 3 and an inner core tube 4. The above-mentioned stent body 1 is formed by weaving hollow metal wires, and each of the above-mentioned metal wires is provided with a drug delivery hole communicating with its inner cavity. One end of the above-mentioned outer catheter 3 is connected to one end of the above-mentioned stent body 1, and a flow channel communicating with the inner cavity of the above-mentioned metal wire is provided in the above-mentioned outer catheter 3. The above-mentioned inner core tube 4 passes through the middle of the above-mentioned stent body 1. One end of the above-mentioned inner core tube 4 passes through the above-mentioned outer catheter 3, and the other end passes through the other end of the above-mentioned stent body 1 and is connected with a blocking joint. The above-mentioned filtering and intercepting structure 2 is installed on the above-mentioned blocking joint, and the other end of the above-mentioned stent body 1 is connected to the above-mentioned filtering and intercepting structure 2 through a support wire 31.

[0020] It should be supplemented and explained that: there are multiple support wires 31. One ends of the support wires 31 are evenly spaced around one end of the outer catheter 3, and the other ends are respectively connected and fixed to the inner side surface of the filtering and intercepting structure 2, forming the structure of an umbrella frame as a whole. By pushing the outer catheter 3 relative to the inner core tube 4, the filtering and intercepting structure 2 can be effectively opened.

[0021] In this embodiment, the inner core tube 4 is a hollow tube, into which a guide wire can be passed.

[0022] Through interventional treatment, the inner core tube 4, the stent body 1 and the outer catheter 3 are delivered to the position to be thrombolyzed in the blood vessel through the guide wire (refer to the conventional catheter intervention implantation method, which belongs to the conventional clinical operation and will not be described in detail here). Moreover, after the stent body 1 passes through the thrombus along with the guide wire and the inner core tube 4, since the other ends of the outer catheter 3 and the inner core tube 4 are both outside the body, the inner core tube 4 is pulled outward, and the inner core tube 4 will drive the blocking joint to move close to the other end of the stent body 1, and at the same time, the filtering interception structure 2 is opened (the principle of the overall opening is similar to that of opening an umbrella, and the supporting wire 31 is equivalent to the umbrella support. When the blocking joint drives the filtering interception structure 2 to move toward the stent body 1, the supporting wire 31 will The inner core tube 4 is pulled open), and the end through which the thrombus passes presents an intercepting posture. When the inner core tube 4 is continued to be pulled, the blocking joint will push the stent body 1. Under this action, one end of the stent body 1 does not move, and the other end of the stent body 1 moves under the push of the inner core tube 4. During the movement, the stent body 1 is compressed, and the middle part gradually expands (that is, opens). Afterwards, in vitro, the thrombolytic agent is input into its flow channel through the other end of the outer catheter 3. The thrombolytic agent passes through the flow channel--metal wire (metal wire of the stent body 1)--drug delivery hole, and directly acts on the thrombus. After the thrombus is dissolved, the tiny thrombus particles are intercepted and captured by the filtering and intercepting structure 2. After the thrombolysis is completed, as the entire device is taken out of the body from the blood vessel, the thrombus particles are also taken out. The entire stent structure is simple and reasonable in design, can effectively dissolve thrombi, and intercept and capture tiny thrombus fragments after thrombolysis to prevent the fragments from accumulating again to form thrombi, and the thrombolytic effect is better.

[0023] As a preferred embodiment, the two ends of each of the above-mentioned metal wires converge at the two ends of the above-mentioned bracket body 1 and form a columnar connecting portion 11. The connecting portion 11 at the other end of the above-mentioned bracket body 1 is connected to the filtering interception structure 2 through the above-mentioned support wire 31.

[0024] In the above embodiment, the two ends of the metal wire converge to form a hollow connecting portion 11, and the filtering interception structure 2 is connected to the outside of the connecting portion 11. The overall design is relatively reasonable, which facilitates the coordination of the entire device with the sheath and guide wire and the subsequent release, and the entire structural design is also relatively compact.

[0025] In this embodiment, the filtering and intercepting structure 2 is umbrella-shaped when opened, and its umbrella opening faces one end of the stent body 1. The filtering and intercepting structure 2 is umbrella-shaped when expanded, which can effectively intercept and capture thrombus particles after thrombolysis.

[0026] In this embodiment, the filtering and intercepting structure 2 may be made of a polymer material membrane layer, which can filter blood and intercept and capture emboli.

[0027] In this embodiment, the above-mentioned filtering and intercepting structure 2 can also adopt a wire woven mesh, and the purpose of intercepting and capturing embolism particles can be achieved by reasonably configuring the size and mesh count of the woven mesh.

[0028] More specifically, the above-mentioned filtering and intercepting structure 2 is made of a medical nickel-titanium alloy wire woven mesh.

[0029] In this embodiment, the stent body 1 is made of nickel-titanium alloy wire, that is, the wire adopts medical nickel-titanium alloy wire.

[0030] In this embodiment, the support wire 31 is also made of medical nickel-titanium alloy wire.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 a limitation to the present invention.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A thrombolytic stent, characterized in that: It includes an openable or contractible stent body (1), an openable or contractible filter and interception structure (2), an outer catheter (3) and an inner core tube (4). The stent body (1) is formed by braiding hollow metal wires, and each metal wire is provided with a drug delivery hole communicating with its inner cavity. One end of the outer catheter (3) is connected to one end of the stent body (1), and a flow channel communicating with the inner cavity of the metal wire is provided in the outer catheter (3). The inner core tube (4) is disposed through the middle of the stent body (1). One end of the inner core tube (4) passes through the outer catheter (3), and the other end passes through the other end of the stent body (1) and is connected with a blocking joint. The filter and interception structure (2) is mounted on the blocking joint, and the other end of the stent body (1) is connected to the filter and interception structure (2) through a support wire (31).

2. The thrombolytic stent according to claim 1, characterized in that: Both ends of each metal wire converge at both ends of the stent body (1) respectively to form a columnar connecting portion (11), and the connecting portion (11) at the other end of the stent body (1) is connected to the filter and interception structure (2) through the support wire (31).

3. The thrombolytic stent according to claim 1, characterized in that: After being opened, the filter and interception structure (2) is in an umbrella shape, and its umbrella opening faces one end of the stent body (1).

4. The thrombolytic stent according to claim 3, characterized in that: The filter and interception structure (2) is a polymer material film layer.

5. The thrombolytic stent according to claim 3, characterized in that: The filter and interception structure (2) is a metal wire braided mesh.

6. The thrombolytic stent according to claim 5, characterized in that: The filter and interception structure (2) is a nitinol wire braided mesh.

7. The thrombolytic stent according to claim 1, wherein: The metal wire is a nitinol wire.

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