A magnetic wire capture snare device

Abstract

The invention relates to the technical field of medical devices, and in particular to a magnetic guidewire capture snare device, comprising a snare and a magnetic guidewire, wherein the snare comprises a snare net with memory and a magnetic connection component, wherein the magnetic connection component comprises a conveying wire, a second magnetic joint and a connecting guidewire connecting the two, wherein the second magnetic joint is located at the center of the snare net in space, and the second magnetic joint and the magnetic guidewire are opposite magnetic poles, so that the magnetic connection component and the magnetic guidewire can attract each other when they are close to each other, so that the magnetic guidewire is pulled into the snare net, and the guide head prevents the second magnetic joint from escaping from the snare net catheter, so that the snare is connected to the magnetic guidewire, thereby realizing a triple connection between the snare and the magnetic guidewire, and the operation is simple while ensuring the stability of the connection, so that the guidewire loop will not be separated during the process of entanglement and pulling, and has a good clinical technical effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a magnetic wire capture snare device. Background Art

[0002] As one of the essential key devices in minimally invasive surgery, the guide wire plays a crucial role in positioning the path during the operation, providing the only path for the subsequent pushing of other devices into the body and the realization of functions during the operation. In some interventional surgeries such as ventricular septal defect occlusion, patent ductus arteriosus surgery, and mitral valve interventional repair surgery, it is necessary to establish an in-vitro and in-vivo guide wire loop (i.e., in-vitro - blood vessel - target position - blood vessel - in-vitro) to deliver the device along the guide wire loop to the target position. Therefore, how to easily achieve a circular loop path for the guide wire remains a challenging topic.

[0003] Patent CN 111466966 A discloses a method of establishing a channel by connecting two separate magnetic hollow tubes. The two hollow tubes are brought close together by magnetic attraction to establish a guide wire loop path. However, the connection between the two hollow tubes at the connected ends is not fixed and is only connected by weak magnetic attraction. In the complex in-vivo environment, after looping and pulling one end of the guide wire, the magnetic hollow tubes are easily separated from each other, resulting in the collapse of the loop. Moreover, whether the guide wire can successfully pass through the connection of the channel completely depends on the connection quality of the channel connection, with a high degree of unpredictable risk and no reliability.

[0004] Patents CN108366804 A, CN107072682A, and CN 105873527 A disclose a wire mesh capture device that uses the technical principle of a snare in current clinical practice to capture the guide wire. Although it can achieve the capture function to a certain extent, whether it can successfully grasp the target object, when the guide wire and the wire mesh capture device enter the common cavity through the support catheter, they are often not on the same axis, making snaring difficult. It mainly relies on the operator's technique and experience to rotate the catheter to make the two coaxial, and the surgical operation is quite difficult. Moreover, even if the guide wire has entered the snare, during the process of tightening the snare with the catheter, the guide wire may still slip out of the snare, and the target guide wire cannot be captured.

[0005] Patent CN 202136387U discloses a three-jaw chuck type capture mechanism. This mechanism captures the target object through an elastic metal material. This design also has the problem of difficulty in capturing the guide wire when the capture device and the guide wire are not coaxial. At the same time, there are many mechanical transmission devices, and the inner diameter of the catheter cannot be made thin, so it is difficult to be used in endovascular interventions and can only be used in digestive endoscopy surgeries.

[0006] Therefore, it is very necessary to design a capture mechanism system that can accurately position each other, has a stable and reliable clamping force, and smoothly grabs the target guide wire back into the delivery sheath to form a guide wire circular loop. Summary of the Invention

[0007] The present invention breaks through the problems of the prior art and designs a wire capture mechanism system that can accurately position and firmly hold each other, so as to accurately and firmly capture the guide wire and enable the guide wire to achieve a circular loop path.

[0008] To achieve the above object, the present invention designs a magnetic guide wire capture snare device, which includes a snare and a magnetic guide wire, and is characterized in that: the snare includes a snare net with memory, a magnetic connection component and a guide head; the magnetic connection component includes a delivery wire, a magnetic joint two and a connecting guide wire connecting the two; the magnetic joint two is located at the center position of the snare net in space; the magnetic guide wire includes a guide wire and a magnetic joint one; the magnetic joint two and the magnetic joint one are opposite magnetic poles to each other, so that the magnetic connection component and the magnetic guide wire can attract each other when approaching, and the magnetic guide wire is sucked into the snare net, so that a connection is established between the snare and the magnetic guide wire.

[0009] The magnetic guide wire is a split magnetic guide wire.

[0010] The split magnetic guide wire includes a guide wire made of a non-ferromagnetic material and a magnetic joint one with magnetism. The magnetic joint one is fixed at the top end of the guide wire, and the fixing method can be various methods such as welding, bonding or riveting.

[0011] Preferably, the magnetic joint one and the magnetic joint two can be composed of rare earth sintered and magnetized magnets, and their exteriors can also be wrapped with a plastic film.

[0012] Preferably, the plastic film can be materials such as PE, PP and PU with good biocompatibility.

[0013] The snare net is composed of a single or several snare net wires. One end of the single or several snare net wires converges and is fixed on the delivery wire to realize the connection between the snare net and the delivery wire, and the other ends of the snare net wires converge on a blunt-shaped guide head in the axial distal direction of the delivery wire.

[0014] The snare net, the delivery wire and the blunt-shaped guide head cannot be magnetized and cannot be attracted by a magnet. Therefore, non-ferromagnetic materials are preferably used to make the snare net, the delivery wire and the guide head.

[0015] The snare net wire is made of shape memory alloy by clamping and heat setting with a mold, so that the snare net has shape memory.

[0016] The snare net has shape memory and has two states: contraction and expansion.

[0017] The contraction state refers to the delivery state in which the snare net is compressed and enters the snare catheter in a thin strip shape.

[0018] The expanded state refers to the working state in which the snare net is in an olive shape or a spindle shape after freely stretching.

[0019] The magnetic wire capture snare device of the present invention further includes a snare catheter, which is a hollow thin tubular structure and is sleeved outside the delivery wire to enable the delivery wire to move axially in the snare catheter when being pulled.

[0020] The present invention also designs an application method of a magnetic wire capture snare device, which is characterized in that the following steps are carried out:

[0021] Step 1: Delivery: The snare net is in a thin strip structure inside the snare catheter, and the snare catheter is advanced and delivered to the position where the magnetic wire is located.

[0022] Step 2: Release: When the snare catheter reaches the predetermined position, the delivery wire inside the snare catheter is pushed, and the snare net and the magnetic connection assembly are slowly pushed out of the snare catheter. During the process of the snare net disengaging from the snare catheter, the snare net gradually presents a released state.

[0023] Step 3: Capture: After the snare net is completely released, the magnetic wire is attracted by the magnetic joint two at the center position of the snare net, and finally the two are completely attached.

[0024] Step 4: Pull the delivery wire, and the snare net slowly closes. At this time, the magnetic wire is clamped therein. Finally, the snare net returns to a thin strip shape, and the magnetic wire is pulled into the snare catheter together. When the magnetic wire completely enters the snare catheter and is stretched by the delivery wire, the blunt-shaped guide head of the magnetic wire will block the magnetic joint two to prevent the whole magnetic wire from falling off the snare catheter.

[0025] The capture of the magnetic wire is completed, and the connection between the snare device and the magnetic wire is realized.

[0026] Compared with the prior art, the present invention makes the snare device and the magnetic wire approach and fit each other through the physical principle of magnetic attraction, and then realizes a firm physical connection by capturing the snare wire mesh and clamping the magnetic wire with the blunt-shaped guide head of the magnetic wire, so as to realize the dual connection between the snare device and the magnetic wire. The operation is simple while ensuring the stability of the connection, so that the wire loop will not be separated from each other during the loop pulling process, and has good clinical technical effects. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a snare device of a magnetic wire capture snare device in a specific embodiment.

[0028] Figure 2 It is a schematic structural diagram of a magnetic wire of a magnetic wire capture snare device in a specific embodiment.

[0029] Figure 3 It is a schematic diagram of the capture process of a magnetic guide wire capture snare device in a specific embodiment.

[0030] Among them, 1 is a snare, 2 is a magnetic guide wire, 3 is a snare net, 4 is a delivery wire, 5 is a magnetic joint two, 6 is a connecting guide wire, 7 is a guide wire, 8 is a magnetic joint one, 9 is a snare net wire, 10 is a guide head, and 11 is a snare catheter. Specific embodiments

[0031] The present invention will be further described in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0032] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0034] In the present invention, terms such as "distal" and "proximal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only relationship terms determined for the convenience of describing the structural relationship of each component or element of the present invention and do not specifically refer to any component or element of the present invention. It should not be construed as a limitation of the present invention. The proximal end of the present invention refers to the end close to the operator during surgical operation, and the distal end refers to the end far from the operator.

[0035] In the present invention, terms such as "fixed", "connected", and "coupled" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those skilled in the relevant scientific research or technology in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances and should not be construed as a limitation of the present invention.

[0036] See Figure 1 and Figure 2, the present invention designs a magnetic wire capture snare device, which includes a snare 1 and a magnetic wire 2. The snare 1 includes a memory snare net 3, a magnetic connection component, and a guide head 10. The magnetic connection component includes a delivery wire 4, a magnetic joint two 5, and a connecting wire 6 connecting the two. The magnetic joint two 5 is spatially located at the center of the snare net 3, which increases the positioning when the magnetic wire 2 is captured and improves the success rate of capture. The magnetic wire includes a magnetic joint one 7 and a wire 8. The magnetic joint two 5 and the magnetic joint one 8 are opposite magnetic poles to each other, so that the magnetic connection component and the magnetic wire 2 can attract each other, causing the magnetic wire 2 to be sucked into the snare net 3. At the same time, in the snare catheter, the blunt guide head 10 of the magnetic wire will block the magnetic joint two 5, so that the snare 1 and the magnetic wire 2 establish a triple physical connection.

[0037] The triple physical connection refers to: the magnetic connection between the magnetic joint two 5 and the magnetic wire 2; the wrapping physical connection of the snare net 3 wrapping the magnetic wire 2; and the physical connection that the blunt guide head 10 of the magnetic wire blocks the magnetic joint two 5 in the catheter.

[0038] Furthermore, the magnetic wire 2 is a split magnetic wire.

[0039] Preferably, the split magnetic wire includes a wire 7 made of non-ferromagnetic material and a magnetic joint one 8. The magnetic joint one 8 is fixed at the top of the wire 7, and the fixing method can adopt various methods such as bonding, welding, or riveting.

[0040] It should be specifically noted that the wire 7 included in the magnetic wire 2 cannot be magnetized and cannot be attracted by a magnet, because it is necessary to ensure that the two magnetic heads attract each other. If the whole wire is magnetized, it cannot be guaranteed that the two magnetic head ends are attracted. Therefore, the wire 7 must be made of non-ferromagnetic material that cannot be magnetized.

[0041] Preferably, the magnetic joint one and the magnetic joint two can be composed of rare earth sintered and magnetized magnets, and their exteriors can also be wrapped with plastic films.

[0042] Preferably, the plastic film can be materials such as PE, PP, and PU with good biocompatibility.

[0043] Correspondingly, the magnetic joint one 8 and the magnetic joint two 5 have the characteristic of being visible under X-ray.

[0044] Furthermore, the snare net 3 is composed of a single or several snare net wires 9. One end of the single or several snare net wires 9 converges and is fixed on the conveying wire 4 to realize the connection between the snare net 3 and the conveying wire 4. The other end of the snare net wire 9 converges on the blunt-shaped guide head 10 in the axial distal direction of the conveying wire 4. The two ends of the snare net wire 9 can be converged and fixed by various methods such as bonding, welding or riveting.

[0045] Furthermore, the snare net wire 9 is made of shape memory alloy by clamping and heat setting with a mold, that is, the machining mold first fixes the wire and then performs heat treatment.

[0046] Furthermore, the snare net 3 has shape memory and has two states: contraction and expansion.

[0047] Among them, the contraction state, also known as the capture state, refers to the state in which the snare net 3 is compressed into a thin strip shape and conveyed into the snare catheter. At this time, the magnetic joint two 5 is wrapped in the snare net 3 and moves axially in the snare catheter 11 along with the push and pull of the conveying wire 4.

[0048] Another expansion state, also known as the release state, refers to the working state in which the snare net 3 is freely extended into an olive shape or a spindle shape.

[0049] Correspondingly, in a specific embodiment, a snare catheter is further included. The snare catheter 11 is a hollow thin tubular structure, which is sleeved outside the conveying wire 4 to realize the axial movement of the conveying wire 4 in the snare catheter 11 when the conveying wire 4 is pulled, corresponding to the contraction and expansion states of the snare net 3.

[0050] Correspondingly, the snare net 3, the conveying wire 4 and the blunt-shaped guide head 10 cannot be magnetized and cannot be attracted by a magnet, so non-ferromagnetic materials are also required for production.

[0051] Reference Figure 3 , in a specific embodiment, an application method of a magnetic guide wire capture snare device is also designed, which is carried out according to the following steps:

[0052] Step 1: Conveying: The snare net 3 is in a thin strip structure inside the snare catheter 11, and the snare catheter 11 is conveyed towards the position where the magnetic guide wire 2 is located.

[0053] Step 2: Releasing: When the snare catheter 11 reaches the predetermined position, push the conveying wire 4 inside the snare catheter 11, and slowly push the snare net 3 and the magnetic connection assembly out of the snare catheter 11. During the process of the snare net 3 disengaging from the snare catheter 11, the snare net 3 gradually presents the release state.

[0054] Step 3: Capturing: After the snare net 3 is released, the magnetic guide wire 2 is attracted by the magnetic joint two 5 at the center position of the snare net 3, and finally the two are completely attached.

[0055] Step 4: Pull the delivery wire 4, and the snare net 3 slowly closes. At this time, the magnetic guide wire 2 is clamped therein. Finally, the snare net 3 returns to a thin strip shape and is pulled into the snare catheter 11 together with the magnetic guide wire 2, completing the capture of the magnetic guide wire 2 and realizing the connection between the snare 1 and the magnetic guide wire 2.

[0056] In a specific implementation, the magnetic joint two 5 of the snare 1 and the magnetic joint one 8 of the magnetic guide wire 2 can be accurately aligned and attracted to each other when approaching during the entire capture process, and finally can be completely attached to each other. Then, by pulling the delivery wire 4, the snare net 3 can be closed to clamp the magnetic guide wire 2 and be pulled into the snare catheter 11 together, finally realizing the firm physical connection between the snare 1 and the magnetic guide wire 2. Finally, the magnetic guide wire 2 can be easily captured and the purpose of forming a closed loop is achieved.

[0057] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the method of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic guide wire capture snare device, comprising a snare (1) and a magnetic guide wire (2), characterized in that: The snare (1) includes a memory snare net (3), a magnetic connection assembly, and a guide head (10). The magnetic connection assembly includes a delivery wire (4), a magnetic joint two (5), and a connecting guide wire (6) connecting the two. The magnetic joint two (5) is spatially located at the center of the snare net (3). The magnetic guide wire (2) includes a magnetic joint one (8) and a guide wire (7). The magnetic joint two (5) and the magnetic joint one (8) are opposite magnetic poles to each other, so that when the magnetic connection assembly approaches the magnetic guide wire (2), they can attract each other, causing the magnetic guide wire (2) to be sucked into the snare net (3), so that a connection is established between the snare (1) and the magnetic guide wire (2). The magnetic guide wire (2) is a split magnetic guide wire; The split magnetic guide wire includes a guide wire (7) made of non-ferromagnetic material and a magnetic joint one (8) fixed at the top of the guide wire (7); The snare net (3) is composed of a single or several snare net wires (9). One end of the single or several snare net wires (9) converges and is fixed on the delivery wire (4) to realize the connection between the snare net (3) and the delivery wire (4), and the other end converges in the axial distal direction of the delivery wire (4) and is fixed to the blunt guide head (10); The snare net (3), the delivery wire (4), and the guide head (10) are all made of non-ferromagnetic material; The snare net wire (9) is made of shape memory alloy by being heat-set by a mold clamp, so that the snare net (3) has shape memory; The snare net (3) has shape memory and has a contracted form and an expanded state; The contracted form means that the snare net (3) is compressed and enters the thin strip-shaped delivery form of the snare catheter; The expanded state means that the snare net (3) is in an olive-shaped or spindle-shaped working form after freely stretching; It also includes a snare catheter. The snare catheter (11) is a hollow thin tubular structure, which is sleeved outside the delivery wire (4) to realize the axial movement of the delivery wire (4) in the snare catheter (11) when the delivery wire (4) is pulled.

2. The magnetic guide wire capture snare device according to claim 1, characterized in that: Both the magnetic joint one (8) and the magnetic joint two (5) have X-ray imaging characteristics.

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