Thrombus extraction catheter

Abstract

The utility model relates to a thrombus extraction catheter, which comprises an inner tube, an outer tube sleeved on the outer side of the inner tube, a traction wire and a handle, the traction wire is spirally wound on the outer side wall of the inner tube, a gap is arranged between two adjacent spiral rings of the traction wire, and the traction wire has an initial state that the far end part is positioned in the outer tube and an extending state that the far end part extends out of the outer tube; the handle comprises a shell connected to the outer pipe and a driving assembly arranged on the shell, and the driving assembly is configured to enable the traction wire to be switched between the initial state and the stretching-out state. The traction wire is of a spiral structure and can wind and capture thrombus, the traction wire can move by operating the driving assembly on the handle, so that the thrombus is wound and captured, and the thrombus taking-out catheter is simple in structure and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a thrombus removal catheter. BACKGROUND

[0002] Thrombosis is one of the important reasons leading to cardiovascular and cerebrovascular diseases. The main thrombus removal methods at present include drug thrombolysis and mechanical thrombectomy. Drug thrombolysis has problems such as long time and uncertain effect, and mechanical thrombectomy needs accurate operation and effective tools. However, the existing mechanical thrombectomy tools have a relatively complex structure and are inconvenient to operate. UTILITARY MODEL CONTENT

[0003] The utility model aims at providing a thrombus removal catheter which is simple in structure and convenient to operate.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0005] A thrombus removal catheter comprises:

[0006] an inner tube;

[0007] an outer tube, which is sleeved on the outer side of the inner tube;

[0008] a traction wire, which is spirally wound on the outer sidewall of the inner tube, has a gap between two adjacent spiral rings of the traction wire, and has an initial state in which the distal end part of the traction wire is located in the outer tube and an extended state in which the distal end part of the traction wire extends out of the outer tube;

[0009] a handle, which comprises a shell connected to the outer tube and a driving assembly arranged on the shell, and is configured to switch the traction wire between the initial state and the extended state.

[0010] Preferably, the traction wire has two wires arranged alternately.

[0011] Preferably, the outer diameter of the distal end part of the traction wire gradually decreases from proximal to distal.

[0012] Preferably, the traction wire is a metal wire.

[0013] In some embodiments, the metal wire is made of platinum alloy.

[0014] Preferably, the inner sidewall of the outer tube has a spiral groove matched with the traction wire, and the traction wire is arranged in the spiral groove.

[0015] Preferably, the driving assembly comprises a connecting seat movably arranged in the shell and an operating assembly connected to the connecting seat and used for driving the connecting seat to move, and the traction wire is connected to the connecting seat.

[0016] Further preferably, the operating assembly comprises an operating member rotatably and slidably arranged on the housing, and a driven wheel rotatably arranged between the operating member and the connecting seat, the driven wheel being engaged with the operating member and the connecting seat.

[0017] Still further preferably, the driven wheel has a plurality of distribution around the rotation axis of the operating member.

[0018] Preferably, the inner tube comprises an inner tube body and a metal mesh arranged outside the inner tube body.

[0019] Preferably, the distal end of the traction wire has a developing area.

[0020] Thanks to the above technical scheme, the present application has the following advantages over the prior art:

[0021] The thrombus removal catheter comprises an inner tube, an outer tube, a traction wire and a handle, wherein the inner tube is capable of passing a guide wire to ensure the catheter to reach a target blood vessel position; the traction wire has a spiral structure and is capable of winding and capturing a thrombus, and the traction wire is capable of moving by operating a driving assembly on the handle, so as to wind and capture the thrombus, and the structure is simple and convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A structure schematic view of a thrombus removal catheter provided for embodiment 1 (the catheter is relatively long, so it is broken in the middle for convenient display);

[0024] Figure 2 A structure exploded view of a thrombus removal catheter provided for embodiment 1 (the catheter is relatively long, so it is broken in the middle for convenient display);

[0025] Figure 3 A structure schematic view of a distal end of a thrombus removal catheter provided for embodiment 1 (not all outer tubes 2 are shown);

[0026] Figure 4 A cross-sectional view of a proximal end of a thrombus removal catheter provided for embodiment 1;

[0027] Figure 5 A structure schematic view of a distal end of a traction wire provided for embodiment 1;

[0028] Figure 6 A cross-sectional view of an outer tube provided for example 1 (not all shown, only the distal end part is shown);

[0029] Figure 7 An enlarged schematic view of part A in the middle; Figure 1 An enlarged schematic view of part A in the middle;

[0030] Wherein: 1, inner tube; 2, outer tube; 21, spiral groove; 3, traction wire; 31, first metal wire; 32, second metal wire; 4, handle; 41, shell; 411, sliding groove; 412, guide column; 42, operating piece; 43, connecting seat; 44, driven wheel; 45, first connecting piece; 46, second connecting piece; 5, guide wire. DETAILED DESCRIPTION

[0031] Hereinafter, only some exemplary embodiments are simply described. As can be appreciated by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0032] In the description of the embodiments of the present application, it is understood that the positions or location relationships indicated by the terms “far” and “near” are defined with the position of the thrombus removal catheter in use, wherein the side close to the operator is the proximal end and the side away from the operator is the distal end. This is only for the convenience of describing the embodiments of the present application and simplifying the description, and is not intended to indicate or imply that the indicated devices or elements must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0033] In addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0034] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0036] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0037] Example 1

[0038] A type of thrombus removal catheter, such as Figures 1 to 7 As shown, it includes an inner tube 1, an outer tube 2, a traction wire 3, and a handle 4.

[0039] See Figure 1 , Figure 3 and Figure 4 The traction wire 3 is spirally wound around the outer wall of the inner tube 1, with gaps between adjacent spiral loops. The spiral structure of the traction wire 3 provides good stability, and when the traction wire 3 is pushed outwards, the thrombus can be contained within the gaps in the traction wire 3 and moved out of the body along with it, thus achieving thrombus capture and removal. Preferably, the traction wire 3 consists of two interlaced metal wires (a first metal wire 31 and a second metal wire 32), i.e., the first metal wire 31 and the second metal wire 32 form a double spiral structure. The double spiral structure of the traction wire 3 provides better stability and thrombus capture performance. In this embodiment, the first metal wire 31 and the second metal wire 32 are made of platinum alloy.

[0040] To better capture thrombi, the outer diameter of the distal end of traction wire 3 gradually decreases from proximal to distal (e.g., Figure 5The diameter of the distal end of the traction wire 3 is smaller than that of the proximal end (as shown), which facilitates the insertion of the traction wire 3 into the thrombus during the advancement of the traction wire 3 towards the distal end, so as to capture the thrombus. Further, the distal end of the traction wire 3 is also provided with a developing area (not shown in the figure), and the doctor can monitor the position of the traction wire 3 in real time through an X-ray device, so as to ensure the accuracy and safety of the operation.

[0041] The outer tube 2 is sleeved outside the inner tube 1, and the inner side wall of the outer tube 2 is provided with a helical groove 21 (see Figure 6 ) matched with the traction wire 3. The traction wire 3 is arranged in the helical groove 21 and can be controlled to helically advance along the helical groove 21. Through the guidance of the helical groove 21 on the inner wall of the outer tube 2, the traction wire 3 is helically wound around the thrombus during the advancement, so as to ensure that the thrombus can be effectively captured and removed. In addition, the design of the helical groove 21 also increases the flexibility of the catheter, so that it is easier to adapt to the shape of the blood vessel.

[0042] The handle 4 is configured to realize the advancement and withdrawal of the traction wire 3. Referring to Figure 2 , Figure 4 and Figure 7 , the handle 4 comprises a first connecting piece 45, a second connecting piece 46 and a shell 41 connected in sequence from the distal end to the proximal end, and a driving assembly arranged on the shell 41. The shell 41 is provided with a plurality of sliding grooves 411 extending along the axial direction thereof, and each sliding groove 411 is provided with a guide column 412 consistent with the extension direction thereof. The driving assembly comprises a connecting seat 43 movably arranged in the shell 41 and an operating assembly connected to the connecting seat 43 and used for driving the movement of the connecting seat 43, and the traction wire 3 is connected to the connecting seat 43. The operating assembly comprises an operating member 42 rotatably and slidably arranged on the shell 41 and a driven wheel 44 rotatably arranged between the operating member 42 and the connecting seat 43, and the driven wheel 44 is engaged with the operating member 42 and the connecting seat 43. The driven wheel 44 has a plurality of driven wheels 44 distributed around the rotation axis of the operating member 42, and in the embodiment, the driven wheel 44 has three driven wheels 44, and each driven wheel 44 is arranged in the sliding groove 411 and sleeved on the guide column 412. When the operating member 42 is rotated, the operating member 42 drives the driven wheel 44 to rotate with the connecting seat 43 and the traction wire 3. Under the guidance of the helical groove 21 of the outer tube 2, the traction wire 3 drives the connecting seat 43, the operating member 42 and the driven wheel 44 to helically advance towards the distal end synchronously, so that the distal end of the traction wire 3 is switched from the initial state of being located in the outer tube 2 to the extended state of extending out of the outer tube 2. The traction wire 3 can helically wind around the thrombus during the advancement, so as to capture the thrombus.

[0043] In this embodiment, the length of the thrombus extraction catheter is 120-750 mm, and the inner tube 1 is also improved to increase the structural stability of the catheter. The inner tube 1 includes an inner tube body and a metal mesh (not shown in the figure) arranged outside the inner tube body. By adding the metal mesh, the inner tube 1 can maintain structural stability and toughness during use.

[0044] Working principle:

[0045] When the operation starts, the doctor guides the catheter into the target blood vessel through the guide wire 5 to ensure that the catheter can accurately reach the thrombus position. After reaching the target position, the rotation of the control member 42 is controlled to rotate and advance the traction wire 3. The traction wire 3 can entangle and capture the thrombus during rotation and advancement, ensuring that the thrombus will not slip off. After capturing the thrombus, the doctor pulls the catheter towards the proximal end to move the traction wire 3 and the thrombus entangled with the traction wire 3 out of the body.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A thrombus extraction catheter, characterized by, The utility model relates to a medical device, which comprises: an inner tube (1); an outer tube (2) sleeved on the outer side of the inner tube (1); a traction wire (3) spirally wound on the outer sidewall of the inner tube (1), the traction wire (3) having a gap between two adjacent spiral rings, the traction wire (3) having an initial state with the distal end located in the outer tube (2) and an extended state with the distal end extending out of the outer tube (2); a handle (4) comprising a housing (41) connected to the outer tube (2) and a driving assembly arranged on the housing (41), the driving assembly being configured to switch the traction wire (3) between the initial state and the extended state.

2. The thrombus extraction catheter of claim 1, wherein, The traction wire (3) has two wires arranged alternately.

3. The thrombus extraction catheter of claim 1, wherein, The outer diameter of the distal end of the traction wire (3) gradually decreases from proximal to distal.

4. The thrombus extraction catheter of claim 1, wherein, The traction wire (3) is a metal wire.

5. The thrombus extraction catheter of claim 1, wherein, The inner sidewall of the outer tube (2) has a spiral groove (21) matched with the traction wire (3), and the traction wire (3) is arranged in the spiral groove (21).

6. The thrombus extraction catheter of claim 1, wherein, The driving assembly comprises a connecting seat (43) movably arranged in the housing (41) and an operating assembly connected to the connecting seat (43) and used for driving the movement of the connecting seat (43), and the traction wire (3) is connected to the connecting seat (43).

7. The thrombus extraction catheter of claim 6, wherein, The operating assembly comprises an operating member (42) rotatably and slidably arranged on the housing (41) and a driven wheel (44) rotatably arranged between the operating member (42) and the connecting seat (43), and the driven wheel (44) is engaged with the operating member (42) and the connecting seat (43).

8. The thrombus extraction catheter of claim 7, wherein, The driven wheel (44) has a plurality of.

9. The thrombus extraction catheter of claim 1, wherein, The inner tube (1) comprises an inner tube body and a metal mesh arranged on the outer side of the inner tube body.

10. The thrombus extraction catheter of claim 1, wherein, The distal end of the traction wire (3) has a developing area.

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