Delivery device and electrocoagulation embolization coil system

Abstract

The present invention relates to the technical field of medical devices and equipment, and provides a conveyor and electrocoagulation embolization spring coil system, wherein the conveyor is used to connect to the spring coil, including a conveyor rod, a wire structure, and a protective member, wherein the wire structure passes through the conveyor rod and is fixedly connected to the proximal end of the conveyor rod, and the wire structure includes a spring core wire and a first insulated wire connected to the spring core wire; the protective member is arranged at the distal end of the conveyor rod, and the protective member is provided with a receiving channel for isolating the spring core wire from blood flow and a blocking channel connected to the receiving channel, the spring core wire is accommodated in the receiving channel, the first insulated wire passes through the blocking channel and closes the blocking channel, and under the action of an external force, the first insulated wire can extend out of the blocking channel and drive the spring core wire to extend out of the blocking channel. The conveyor and electrocoagulation embolization spring coil system provided by the present invention can reduce the number of spring coils used, shorten surgical time, and reduce surgical costs.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a conveyor and an electrocoagulation embolization coil system. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Aneurysm interventional embolization is a commonly used method for treating aneurysms. Generally, a microcatheter is inserted into the base of the patient's thigh. The embolization component is placed into the aneurysm cavity along the microcatheter through a delivery device, causing thrombosis in the aneurysm cavity, reducing blood flow in the aneurysm, and thus achieving the purpose of curing the aneurysm.

[0004] In the current coil packing method for treating aneurysms, simply using coils for embolization requires the use of multiple coils to achieve the desired therapeutic effect, resulting in a long operation time and high cost. Summary of the Invention

[0005] The object of the present invention is to solve at least one of the above-mentioned problems. This object is achieved by the following technical solutions:

[0006] A first aspect of the present invention provides a conveyor for connecting to a spring coil, comprising:

[0007] conveyor rod;

[0008] a wire structure, the wire structure passing through the delivery rod and fixedly connected to the proximal end of the delivery rod, the wire structure comprising a spring core wire and a first insulated wire connected to the spring core wire;

[0009] A protective member is arranged at the distal end of the delivery rod, and the protective member is provided with an accommodating channel for isolating the spring core wire from blood flow and a blocking channel 5 connected to the accommodating channel. The spring core wire is accommodated in the accommodating channel, and the first insulated wire passes through the blocking channel and closes the blocking channel. Under the action of external force, the first insulated wire can extend out of the blocking channel and drive the spring core wire to extend out of the blocking channel.

[0010] According to the conveyor proposed by the present invention, since the first insulated wire passes through the blocking channel and closes the blocking channel, it prevents blood from entering the receiving channel from the blocking channel and causing electrochemical corrosion with the spring core wire to be disconnected. After the electrocoagulation embolization is completed, the first insulated wire can be extended out of the blocking channel under the action of external force and drive the spring core wire to extend out of the blocking channel. Since the spring core wire is a bare guide wire, it is electrochemically corroded and disconnected under the action of current and blood, thereby completing the self-release of the electrocoagulation embolization spring coil system. When in use, the spring coil can be released first, and then power can be applied to cause it to occur at the position of the spring coil.

[0011] After the electrocoagulation is completed, the spring core wire is extended to block the channel, and the spring core wire undergoes electrochemical corrosion and breaks. The whole process does not require additional equipment, and can also achieve immediate embolization, reducing

[0012] The use of spring coils can shorten the operation time and reduce the cost of surgery.

[0013] In addition, the conveyor according to the present invention may also have the following additional technical features:

[0014] In some embodiments of the present invention, the protective member includes a first part and a second part connected to the first part, the first part is a hollow structure, the accommodating channel is formed in the hollow structure, and the blocking channel is arranged in the second part.

[0015] In some embodiments of the present invention, the protective member is located outside the delivery rod, the proximal end of the spring core wire is connected to the distal end of the first insulated wire, and the first insulated wire is fixedly connected to the distal end of the delivery rod.

[0016] In some embodiments of the present invention, the axial length of the first portion is no greater than the axial length of the spring core wire.

[0017] In some embodiments of the present invention, the wire structure further includes a second connecting core wire, the distal end of the second connecting core wire is connected to the proximal end of the first insulated wire, and the wire structure is fixed to the proximal end of the delivery rod through the second connecting core wire.

[0018] In some embodiments of the present invention, the protective member is fixedly disposed in the delivery rod, the second part is a tubular structure, the outer periphery of the second part is in contact with the inner wall of the delivery rod, the first part is disposed in the second part, and the distal end of the spring core wire is connected to the proximal end of the first insulated wire.

[0019] In some embodiments of the present invention, the wire structure also includes a second insulated wire and a second connecting core wire, the distal end of the second insulated wire is connected to the proximal end of the spring core wire, the proximal end of the second insulated wire is connected to the distal end of the second connecting core wire, and the wire structure is fixed to the proximal end of the delivery rod through the second connecting core wire.

[0020] In some embodiments of the present invention, the wire structure further includes a first connecting core wire, the proximal end of the first connecting core wire is connected to the distal end of the first insulated wire, and the first connecting core wire is used to be fixedly connected to the spring coil.

[0021] A second aspect of the present invention provides an electrocoagulation embolization spring coil system, characterized in that it comprises a spring coil and any one of the above-mentioned conveyors, wherein the spring coil is fixedly connected to the distal end of the guide wire structure.

[0022] In some embodiments of the present invention, the protective member includes a first part and a second part connected to the first part, the first part is a hollow structure, the accommodating channel is formed in the hollow structure, the protective member is located outside the conveying rod, and the spring coil blocks the end of the second part away from the first part.

[0023] In some embodiments of the present invention, the spring coil includes a spherical cap portion, a spring portion, and a connecting portion, wherein the connecting portion is arranged at the proximal end of the spring portion, the spherical cap portion is arranged at the distal end of the spring portion, and the connecting portion blocks the end of the second portion away from the first portion.

[0024] In some embodiments of the present invention, the wire structure further includes a first connecting core wire, a proximal end of the first connecting core wire is connected to the distal end of the first insulated wire, and the first connecting core wire is fixedly connected to the spring coil.

[0025] In some embodiments of the present invention, the spring coil includes a spherical cap portion, a spring portion and a connecting portion, the connecting portion is arranged at the proximal end of the spring portion, the spherical cap portion is arranged at the distal end of the spring portion, and the first connecting core wire is fixedly connected to the connecting portion.

[0026] In some embodiments of the present invention, when the spring coil is in a released state, the spherical cap portion and part of the spring portion form a first disc structure, the connecting portion and part of the spring portion form a second disc structure, and the diameter of the first disc structure is smaller than the diameter of the second disc structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0028] Figure 1 Schematically shows the structure of the electrocoagulation embolization coil system according to the first embodiment of the present invention;

[0029] Figure 2 Schematically shows an installation diagram of a conveying rod and a conductor structure according to a first embodiment of the present invention;

[0030] Figure 3 Schematically shows the Figure 2 A magnified schematic diagram of

[0031] Figure 4 Schematically shows a cross-sectional view of a protective member according to a first embodiment of the present invention;

[0032] Figure 5 Schematically shows a schematic structural diagram of a wire structure according to a first embodiment of the present invention;

[0033] Figure 6 Schematically shows a structural diagram of a spring coil in a contracted state according to a first embodiment of the present invention;

[0034] Figure 7 Schematically shows a first perspective diagram of a spring coil in an expanded state according to a first embodiment of the present invention;

[0035] Figure 8 Schematically shows a second viewing angle diagram of the spring coil in the expanded state according to the first embodiment of the present invention;

[0036] Figure 9 Schematically shows a working diagram of the electrocoagulation embolization coil system according to the first embodiment of the present invention;

[0037] Figure 10 Schematically shows a first structural diagram of a release zone according to a first embodiment of the present invention;

[0038] Figure 11 Schematically shows a second structural diagram of the release zone according to the first embodiment of the present invention;

[0039] Figure 12 Schematically shows a third structural diagram of the release zone according to the first embodiment of the present invention;

[0040] Figure 13Schematically shows a structural diagram of an electrocoagulation embolization coil system according to a second embodiment of the present invention;

[0041] Figure 14 Schematically shows a cross-sectional view of a protective member according to a second embodiment of the present invention;

[0042] Figure 15 Schematically shows a schematic structural diagram of a conductor structure according to a second embodiment of the present invention;

[0043] Figure 16 Schematically shows a first structural diagram of a release zone according to a second embodiment of the present invention;

[0044] Figure 17 Schematically shows a second structural diagram of the release zone according to the second embodiment of the present invention;

[0045] Figure 18 The third structural diagram of the release zone according to the second embodiment of the present invention is schematically shown.

[0046] Description of reference numerals:

[0047] 10 is the electrocoagulation embolization coil system, 20 is the aneurysm, 30 is the thrombus, 40 is the power source, and 50 is the microcatheter;

[0048] 1 is a delivery rod, 11 is a delivery tube, 12 is a heat shrink tube, 13 is a developing spring, and 14 is a power connection tube;

[0049] 2 is a wire structure, 21 is a spring core wire, 22 is a first insulated wire, 23 is a second connecting core wire, 24 is a first connecting core wire, and 25 is a second insulated wire;

[0050] 3 is a protective member, 31 is a first portion, 311 is a receiving channel, 32 is a second portion, and 321 is a blocking channel;

[0051] 4 is a spring coil, 41 is a ball cap portion, 411 is a ball cap, 412 is a cylindrical portion, 42 is a spring portion, 43 is a connecting portion, and 44 is an anti-untwisting wire;

[0052] 5 is the first disc structure, 6 is the second disc structure;

[0053] The arrows in the figure indicate the direction of current flow. DETAILED DESCRIPTION

[0054] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0056] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0057] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0059] It should be noted that in this application, the term "from a value to another value" is used as a summary to avoid listing all values ​​within the range in the specification. Therefore, the description of a specific numerical range encompasses any value within that range and any smaller numerical range defined by any value within that range, just as if the value and smaller numerical range were explicitly stated in the specification.

[0060] In this application, the end closest to the operator during use is referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." This principle is used to define the "proximal end" and "distal end" of any component of an electrocoagulation embolic coil system. "Axial" generally refers to the length of the electrocoagulation embolic coil system during delivery, and "radial" generally refers to the direction perpendicular to the "axial" direction of the electrocoagulation embolic coil system. This principle is used to define the "axial" and "radial" directions of any component of an electrocoagulation embolic coil system.

[0061] See Figure 1-Figure 2 As shown, the present invention proposes an electrocoagulation embolization coil system 10, including a coil 4 and a conveyor, wherein the conveyor includes a wire structure 2, and the coil 4 is fixedly connected to the distal end of the wire structure 2, so as to supply power to the coil 4 through the wire structure 2, so that a thrombus is formed around the coil 4, and immediate embolization is achieved through electrocoagulation, thereby reducing the use of the coil 4, shortening the operation time, and reducing the operation cost.

[0062] The delivery device also includes a delivery rod 1 and a protective member 3. A wire structure 2 passes through the delivery rod 1 and is fixedly connected to the proximal end of the delivery rod 1. The wire structure 2 includes a spring core wire 21 and a first insulated wire 22 connected to the spring core wire 21. The protective member 3 is disposed at the distal end of the delivery rod 1. The protective member 3 is provided with a receiving channel 311 for isolating the spring core wire 21 from blood flow and a blocking channel 321 connected to the receiving channel 311. The spring core wire 21 is accommodated in the receiving channel 311, and the first insulated wire 22 passes through the blocking channel 321 and seals the blocking channel 321. Under the action of an external force, the first insulated wire 22 can extend out of the blocking channel 321 and drive the spring core wire 21 out of the blocking channel 321.

[0063] Continue reading Figure 3 and Figure 5 As shown, there is no insulating layer material on the surface of the spring core wire 21, so when it comes into contact with blood in the state of being energized, electrochemical corrosion will occur and it will break. The first insulated wire 22 is an insulating layer material wrapped around the outer surface of the core wire. Therefore, even if the first insulated wire 22 comes into contact with blood in the state of being energized, it will not be electrochemically corroded and broken.

[0064] The insulating material is preferably a polymer material such as PI (polyimide), PET (polyethylene terephthalate), PTFE (polytetrafluoroethylene), etc., and the core wire is a metal material such as stainless steel, nickel titanium, etc., with a wire diameter of 0.04-0.1mm, which is used to transmit current.

[0065] Example 1

[0066] A channel is provided inside the delivery rod 1 for the wire structure 2 to pass through the delivery rod 1, and the spring core wire 21 is directly or indirectly electrically connected to the spring coil 4. The protective member 3 is located outside the delivery rod 1, and the end of the protective member 3 facing away from the delivery rod 1 is fixedly connected to the spring coil 4.

[0067] Combine Figure 3 、 Figure 4 as well as Figure 10 As shown, the end of the protective member 3 facing away from the conveying rod 1 is fixedly connected to the spring coil 4. The protective member 3 includes a first part 31 and a second part 32 connected to the first part 31. The first part 31 is located at the distal end of the second part 32. The first part 31 is a hollow structure. The accommodating channel 311 is formed in the hollow structure. The blocking channel 321 is arranged in the second part 32. The outer side surface of the first insulated wire 22 abuts against the inner wall surface of the blocking channel 321 to seal the blocking channel 321. The spring coil 4 is fixedly connected to the distal end of the protective member 3 and blocks the accommodating channel 311, preferably by welding, so that the accommodating channel 311 constitutes an enclosed space to prevent blood from entering the accommodating channel 311, thereby preventing the spring core wire 21 from being damaged by electrochemical corrosion.

[0068] At the same time, combined Figure 10 、 Figure 11 as well as Figure 12 As shown, the proximal end of the spring core wire 21 abuts against the protective member 3 and is connected to the distal end of the first insulated wire 21, and the distal end abuts against the spring coil 4. The first insulated wire 21 is fixedly connected to the distal end of the delivery rod 1. When the delivery rod 1 is pulled proximally, the spring coil 4 and the protective member 3 are fixed at the thrombus and cannot move. The first insulated wire 22 stretches the spring core wire 21 and makes the spring core wire 21 extend out of the blocking channel 321 and contact with the blood, and then the spring core wire 21 is disconnected by electrochemical corrosion, thereby realizing the separation of the delivery device and the spring coil.

[0069] See Figure 3 As shown, the axial length of the first portion 31 is not greater than the axial length of the spring core wire 21 when it is in an extended state, that is, the spring coil 4 squeezes the spring core wire 21 into the accommodating channel 311, and the spring core wire 21 is in a compressed state.

[0070] The material of the protective member 3 is preferably a metal material with good biocompatibility such as platinum tungsten, platinum iridium, nickel titanium, cobalt chromium, stainless steel, etc., which can achieve the function of imaging. Of course, the protective member 3 can also be made of non-metallic materials. Figure 10 As shown, when the material of the protective member 3 is a metal material, the current of the spring core wire 21 can flow indirectly to the spring coil 4 through the protective member 3, and can also flow directly to the spring coil 4; when the material of the protective member 3 is a non-metallic material, it does not have a conductive effect, and the current of the spring core wire 21 flows directly to the spring coil 4; the outer diameter of the protective member 3 is 0.25-0.36mm, the diameter of the accommodating channel 311 is 0.1-0.25mm, and the diameter of the blocking channel 321 is 0.05-0.1mm.

[0071] Combine Figure 2 and Figure 5 As shown, the delivery rod 1 includes a delivery tube 11 and a power connection tube 14 disposed at the proximal end of the delivery tube 11. The proximal end of the wire structure 2 is a second connecting core wire 23, which is connected to the power connection tube 14 of the delivery rod 1. The wire structure 2 is fixed to the proximal end of the delivery rod 1 via the second connecting core wire 23, and the power connection tube 14 is disposed at the proximal end of the delivery tube 11. The power connection tube 14 is electrically connected to the second connecting core wire 23 for supplying power to the second connecting core wire 23. The power connection tube 14 is connected to the delivery tube 11 via a connecting socket, and the connecting socket insulates the power connection tube 14 from the delivery tube 11, thereby preventing interference from the current.

[0072] The first insulated wire 22 passes through the delivery tube 11 and is connected to the second connecting core wire 23. The second connecting core wire 23 is located in the power connection tube 14 and is connected to the power connection tube 14. Therefore, the spring core wire 21 is indirectly connected to the second connecting core wire 23 through the first insulated wire 22. The power connection tube 14, the second connecting core wire 23, the first insulated wire 22, the spring core wire 21 and the spring coil 4 constitute a positive electrode path in sequence. Then, the blood in contact with the spring coil 4 transmits the current to the delivery tube 11, and the delivery tube 11 constitutes a negative electrode path. Finally, the circuit flows back through the delivery tube 11 and constitutes a complete current loop.

[0073] Obviously, see Figure 9 As shown, the spring core wire 21 provides positive charge to the spring coil 4 , which enables the spring coil 4 to attract negatively charged blood electrophoresis, and can quickly form a stable thrombus 30 around the spring coil 4 , thereby achieving embolization treatment of the aneurysm 20 .

[0074] Combine Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the delivery rod 1 further includes a heat shrink tube 12, which is sleeved on the outer side of the delivery tube 11. The surface of the heat shrink tube 12 is relatively smooth and has insulating properties, so as to reduce the friction between the delivery rod 11 and the microcatheter 50, and at the same time isolate the delivery tube 11 from the human body's blood, thereby reducing the loss of electricity during the power supply process. It should be noted that the heat shrink tube 12 does not completely wrap the delivery tube 11, and the distal end of the delivery tube 11 is exposed and in contact with the blood for conducting with the blood.

[0075] Continue reading Figure 3 As shown, the delivery rod 1 also includes a developing spring 13 embedded in the distal end of the delivery tube 11. The developing spring 13 is sleeved on the outer side of the first insulated wire 22, and the developing spring 13 is respectively fixedly connected to the first insulated wire 22 and the distal inner cavity of the delivery tube 11, so that the developing spring 13, the first insulated wire 22 and the delivery tube 11 form an integral structure, so that when the delivery tube 11 is pulled toward the proximal end, the first insulated wire 22 and the delivery tube 11 can move axially relatively statically, thereby facilitating the spring core wire 21 to extend out of the blocking channel.

[0076] See Figure 6 As shown, specifically, the spring coil 4 is connected to the distal end of the wire structure 2, and the spring coil 4 blocks the end of the second part 32 away from the first part 31. The spring coil 4 includes a spherical cap portion 41, a spring portion 42 and a connecting portion 43. The connecting portion 43 is arranged at the proximal end of the spring portion 42, and the spherical cap portion 41 is arranged at the distal end of the spring portion 43. The connecting portion 43 is fixedly connected to the distal end of the protective member 3 to block the end of the second part 32 away from the first part 31. The material of the spring portion 42 is preferably metal materials such as platinum tungsten alloy, nickel titanium alloy, and stainless steel.

[0077] Furthermore, the spring coil 4 also includes an anti-untwisting wire 44. The material of the anti-untwisting wire 44 is preferably a polymer material with good biocompatibility such as PP, PET, PTFE, PA, etc. The spring part 42 includes several coils of springs, and the several coils of springs are connected in sequence. One end of the anti-untwisting wire 44 is connected to the ball cap part 41, and the other end is connected to the connecting part 43, and the anti-untwisting wire 44 is passed through several coils of springs in sequence to ensure that the spring coil 4 does not untwist.

[0078] Continue reading Figure 6 As shown, the spherical cap portion 41 includes a spherical cap 411 and a cylindrical portion 4312. The spherical cap 411 and the cylindrical portion 412 are connected. The cylindrical portion 412 is embedded in the distal end of the spring portion 432. The cylindrical portion 412 has at least 2 circles of embedded springs. The diameter of the spherical cap 411 is equal to the diameter of the spring portion 42, which is 0.25-0.36m. The cylindrical portion 412 is embedded in the spring portion 42 to form a fixed relationship. Therefore, the spherical cap portion 41 and the spring portion 42 have a smooth transition, which avoids the formation of sharp structures, thereby avoiding the existing sharp structures from causing damage to human blood vessels.

[0079] Combine Figure 7 and Figure 8 As shown, when the spring coil 4 is in the released state, the spring portion 42 expands in the radial direction, the spherical cap portion 41 and part of the spring portion 42 form a first disc structure 5, and the connecting portion 43 and part of the spring portion 42 form a second disc structure 6. The diameter of the first disc structure 5 is smaller than the diameter of the second circular ring structure 6. Therefore, when the spring coil 4 is released at the neck of the aneurysm 20, the second disc structure 6 expands and blocks the neck of the aneurysm 20. Regardless of whether it is a wide-necked aneurysm or a narrow-necked aneurysm, only one spring coil 4 needs to be implanted and released into the neck of the aneurysm 20, avoiding the need for multiple spring coils 4, which can reduce the operation time and reduce the operation cost. The diameter D of the second disc structure 6 should be 1-2 mm larger than the diameter of the neck of the aneurysm 20 so that the second disc structure 6 completely covers the neck of the aneurysm 20.

[0080] Preferably, the diameter d of the first disc structure 5 is 50-75% of the diameter D of the second disc structure 6. During the release process, the first disc structure 5 is released first, which reduces the size of the first disc structure 5 and helps avoid puncturing the aneurysm wall.

[0081] The working principle of the conveyor is:

[0082] (1) See Figure 9 As shown, the delivery device is delivered to the lesion site, and the spring coil 4 is expanded and deployed to completely cover the neck of the aneurysm 20, keeping the delivery device fixed;

[0083] (2) See Figure 10As shown, the power connection tube 14 is then connected to the positive electrode of the power supply 40. The power supply voltage is 6-12V and the current is 0.5-5mA. The current is sequentially delivered to the spring coil 4 through the power connection tube 14, the second connecting core wire 23, the first insulated wire 22, and the spring core wire 21. The blood in contact with the spring coil 4 then transmits the current to the delivery tube 11. Finally, the current returns to the negative electrode of the power supply 40, forming a complete current loop.

[0084] (3) The spring coil 4 is connected to the positive electrode of the power supply 40, which absorbs negatively charged substances in the blood and induces the formation of a thrombus 30. After a period of time, DSA angiography is performed to observe that there is no contrast agent accumulation in the aneurysm cavity, indicating that the thrombus 30 completely covers the neck of the aneurysm 20, thereby achieving the purpose of treating the aneurysm 20.

[0085] (4) See Figure 11 As shown, after the electrocoagulation is completed, the delivery rod 1 is withdrawn proximally, the protective member 3 and the spring coil 4 are positioned and fixed at the aneurysm neck, and the first insulated wire 22 moves proximally and pulls the spring core wire 21 out of the blocking channel 321. It should be noted that at this time, the current loop changes, the proximal end of the spring core wire 21 contacts the thrombus 30, and the current is transmitted to the thrombus 30 in contact therewith. The current is then conducted back from the delivery tube 11 to the negative electrode of the power supply 40 through the conduction effect of the blood.

[0086] (5) See Figure 12 As shown, under the action of the electric current, the exposed spring core wire 21 is electrochemically corroded by the blood and is disconnected. At this time, the spring core wire 21 of the wire structure 2 is disconnected from the first insulated wire 22, and the first insulated wire 22 is released and separated from the protective member 3, thereby completing the release and separation of the delivery tube 11 and the spring coil 4. The operation is completed, and the delivery rod 1 and the microcatheter 50 can be withdrawn proximally.

[0087] Example 2

[0088] In Example 2, the same symbols are given to the same structures as in Example 1, and the same descriptions are omitted. Example 2 makes improvements based on Example 1: the installation position of the protective member 3, the structure of the protective member 3 and the structure of the wire structure 2.

[0089] See Figure 13 、 Figure 14 and Figure 16 As shown, the protective member 3 includes a first part 31 and a second part 32. The first part 31 is arranged in the second part 32. The first part 31 is a hollow structure. The accommodating channel 311 is formed in part of the hollow structure. The blocking channel 321 is arranged in the second part 32. The first part 31 and the second part 32 are both tubular structures. The outer periphery of the second part 32 is in contact with the inner wall of the conveying rod 1.

[0090] It should be noted that second portion 32 is made of insulating material to prevent contact between spring core 21 and delivery tube 11, which could cause a short circuit. This is because spring core 21 serves as part of the positive electrode path, while delivery tube 11 serves as part of the negative electrode path. If the two were connected, a short circuit would occur. The axial length of second portion 32 is greater than that of spring core 21 to prevent contact between spring core 21 and the inner wall of delivery tube 11.

[0091] The first part 31 can be made of metal materials, such as platinum tungsten, platinum iridium, nickel titanium, cobalt chromium, stainless steel

[0092] Metal materials with good biocompatibility can achieve the function of visualization, making it convenient to observe the situation at the distal end of the delivery tube 110.

[0093] See Figure 15 and Figure 16 As shown, the wire structure 2 also includes a first connecting core wire 24 and a second insulated wire 25. The wire structure 2 is fixed to the proximal end of the delivery rod 1 through the second connecting core wire 23. The spring core wire 21 is provided at the proximal end of the first insulated wire 22, and the second insulated wire 25 is provided at the proximal end of the spring core wire 21.

[0094] The proximal end of the second connecting core wire 23 is provided at the proximal end of the second insulated wire 25, the first connecting core wire 245 is provided at the distal end of the first insulated wire 22, and the first connecting core wire 24 is connected to the connecting part 33 of the spring coil 4; the distal end of the first connecting core wire 24 is provided with a hook, and the connecting part 43 is provided with a hook hole, the first connecting core wire 24 and the connecting part 43 are hooked, and the first connecting core wire 24 is bonded to the connecting part 43 through biological glue to form an integrated structure, so as to avoid the first connecting core wire 24 from being damaged by electrochemical corrosion.

[0095] Therefore, continue to refer to Figure 13 As shown, the power connection tube 14, the second connection core wire 23, the second 0 insulated wire 25, the spring core wire 21, the first insulated wire 22, the first connection core wire 24 and the spring

[0096] The coils 4 in turn form a positive path, and then the blood in contact with the spring coils 4 transmits the current to the delivery tube 11, which forms a negative path. Finally, the circuit flows back through the delivery tube 11 and forms a complete current loop.

[0097] The working principle of the conveyor is:

[0098] (1) The delivery device is delivered to the lesion site, and the spring coil 4 is expanded and deployed to completely cover the neck of the aneurysm 20, while the delivery device is kept fixed;

[0099] (2) Then, the power connection tube 14 is connected to the positive electrode of the power supply 40. The power supply voltage is 6-12V and the current is 0.5-5mA. The current is directly delivered to the spring coil 4 through the power connection tube 14, the second connecting core wire 23, the second insulated wire 25, the spring core wire 21, the first insulated wire 22, and the first connecting core wire 24. Then, the blood in contact with the spring coil 4 transmits the current to the delivery tube 11, and finally the current returns to the negative electrode of the power supply 40, forming a complete current loop;

[0100] (3) The spring coil 4 is connected to the positive electrode of the power supply 40, which absorbs negatively charged substances in the blood and induces the formation of a thrombus 30. After a period of time, DSA angiography is performed to observe that there is no contrast agent accumulation in the aneurysm cavity, indicating that the thrombus 30 completely covers the neck of the aneurysm 20, thereby achieving the purpose of treating the aneurysm 20.

[0101] (4) See Figure 17 As shown, after the electrocoagulation is completed, the delivery rod 1 is withdrawn proximally, the spring coil 4 is located at the neck of the aneurysm 20 and fixed, and because the distal end of the spring core wire 21 abuts against the protective member 3, the first insulated wire 22 moves distally and pulls the spring core wire 21 out of the blocking channel 121. It should be noted that at this time, the current loop changes, the first connecting core wire 24 contacts the thrombus 30, and transmits the current to the thrombus 30 in contact with it, and then the current is returned from the delivery tube 11 to the negative electrode of the power supply through the conduction effect of the blood;

[0102] (5) See Figure 18 As shown, under the action of the electric current, the exposed spring core wire 21 is electrochemically corroded by the blood and is disconnected. At this time, the spring core wire 21 of the wire structure 2 is disconnected from the first insulated wire 22, and the spring core wire 21 is separated from the spring coil 4. In this way, the delivery tube 11 is separated from the spring coil 4. The operation is completed, and the delivery rod 1 and the microcatheter 50 can be withdrawn.

[0103] The delivery device also includes an introduction sheath and a microcatheter 50. The delivery process is as follows: (1) first, the spring coil 4 is connected to the delivery rod 1, and the whole is loaded into the introduction sheath (not shown in the figure), the spring coil 4 is in a compressed state, and part of the delivery rod 1 extends out of the proximal end of the introduction sheath; (2) the microcatheter 50 is delivered to the lesion site (such as the aneurysm); (3) the introduction sheath is connected to the proximal end of the microcatheter 50, and then the delivery rod 1 is pushed toward the distal end, and the spring coil 4 is pushed from the introduction sheath into the microcatheter 50; (4) the delivery rod 1 is continued to be pushed toward the distal end, and after reaching the target position, the spring coil 4 is disengaged from the microcatheter 50 and then expanded to block the neck of the aneurysm 20; (5) the microcatheter 50 and the delivery rod 1 are withdrawn toward the proximal end.

[0104] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An electrocoagulation embolization coil system, characterized in that: Including spring coil and conveyor; The conveyor comprises: conveyor rod; a wire structure, the wire structure passing through the delivery rod and fixedly connected to the proximal end of the delivery rod, the wire structure comprising a spring core wire and a first insulated wire connected to the spring core wire, the distal end of the wire structure being fixedly connected to the spring coil, the spring core wire having a wire diameter of 0.04-0.1 mm, and the spring core wire being used to transmit current; A protective member is arranged at the distal end of the conveying rod, and the protective member is provided with an accommodating channel for isolating the spring core wire from blood flow and a blocking channel connected to the accommodating channel. The spring core wire is accommodated in the accommodating channel, and the first insulating wire passes through the blocking channel and closes the blocking channel. Under the action of external force, the first insulating wire can extend out of the blocking channel and drive the spring core wire to extend out of the blocking channel and contact with blood, and then the spring core wire is disconnected by electrochemical corrosion, thereby realizing the separation of the conveyor and the spring coil.

2. The electrocoagulation embolization coil system according to claim 1, characterized in that: The protective member includes a first part and a second part connected to the first part, the first part is a hollow structure, the accommodating channel is formed in the hollow structure, and the blocking channel is arranged in the second part.

3. The electrocoagulation embolization coil system according to claim 2, characterized in that: The protective member is located outside the delivery rod, the proximal end of the spring core wire is connected to the distal end of the first insulated wire, and the first insulated wire is fixedly connected to the distal end of the delivery rod.

4. The electrocoagulation embolization coil system according to claim 3, characterized in that: The axial length of the first portion is no greater than the axial length of the spring core wire.

5. The electrocoagulation embolization coil system according to claim 3, characterized in that: The wire structure further includes a second connecting core wire, the distal end of the second connecting core wire is connected to the proximal end of the first insulated wire, and the wire structure is fixed to the proximal end of the delivery rod via the second connecting core wire.

6. The electrocoagulation embolization coil system according to claim 2, characterized in that: The protective member is fixedly arranged in the delivery rod, the second part is a tubular structure, the outer periphery of the second part is in contact with the inner wall of the delivery rod, the first part is arranged in the second part, and the distal end of the spring core wire is connected to the proximal end of the first insulated wire.

7. The electrocoagulation embolization coil system according to claim 6, characterized in that: The wire structure also includes a second insulated wire and a second connecting core wire. The distal end of the second insulated wire is connected to the proximal end of the spring core wire, and the proximal end of the second insulated wire is connected to the distal end of the second connecting core wire. The wire structure is fixed to the proximal end of the delivery rod through the second connecting core wire.

8. The electrocoagulation embolization coil system according to claim 6, characterized in that: The wire structure further includes a first connecting core wire, the proximal end of the first connecting core wire is connected to the distal end of the first insulated wire, and the first connecting core wire is used for fixed connection with the spring coil.

9. The electrocoagulation embolization coil system according to claim 1, characterized in that: The protective member includes a first part and a second part connected to the first part. The first part is a hollow structure. The accommodating channel is formed in the hollow structure. The protective member is located outside the conveying rod. The spring coil blocks the end of the second part away from the first part.

10. The electrocoagulation embolization coil system according to claim 9, characterized in that: The spring ring includes a ball cap portion, a spring portion and a connecting portion. The connecting portion is arranged at the proximal end of the spring portion, the ball cap portion is arranged at the distal end of the spring portion, and the connecting portion blocks an end of the second portion away from the first portion.

11. The electrocoagulation embolization coil system according to claim 1, characterized in that: The wire structure further includes a first connecting core wire, the proximal end of the first connecting core wire is connected to the distal end of the first insulated wire, and the first connecting core wire is fixedly connected to the spring coil.

12. The electrocoagulation embolization coil system according to claim 11, characterized in that: The spring coil includes a ball cap portion, a spring portion and a connecting portion. The connecting portion is arranged at the proximal end of the spring portion, the ball cap portion is arranged at the distal end of the spring portion, and the first connecting core wire is fixedly connected to the connecting portion.

13. The electrocoagulation embolization coil system according to claim 10 or 12, characterized in that: When the spring coil is in a released state, the spherical cap portion and a portion of the spring portion form a first disc structure, and the connecting portion and a portion of the spring portion form a second disc structure. The diameter of the first disc structure is smaller than that of the second disc structure.

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