Push rod, release device and medical device

Abstract

The application provides a push rod, a release device and a medical device. The push rod comprises a first conductor and a second conductor. The first conductor has an inner cavity extending through in the axial direction and comprises a conductive tube and a conductive spring. The proximal end of the conductive spring is electrically connected to the distal end of the conductive tube. The second conductor is at least partially arranged in the inner cavity and is non-electrically connected to the first conductor. The distal end of the second conductor is provided with a release area. The push rod can be quickly electrolytically released and has good push performance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a push rod, a release device, and a medical device. Background Technology

[0002] With the development of medical technology, endovascular interventional therapy has gradually emerged and has attracted attention and importance due to its advantages such as minimal trauma, low risk, and few complications.

[0003] The principle of endovascular interventional therapy is to establish a delivery pathway through the body's blood vessels, then use a delivery device to transport the medical implant to the lesion site, and finally release the medical implant to the lesion site for treatment. Therefore, the connection between the delivery device and the medical implant is crucial. It must maintain an effective connection between the medical implant and the delivery device during delivery, and also be able to smoothly disconnect the medical implant from the delivery device after it reaches the lesion site.

[0004] In the field of interventional treatment of aneurysms, the connection between the delivery device and the medical implant is mainly achieved through mechanical and electrical release. Electrical release works by connecting the release area between the implant and the delivery device to the positive terminal of an external power source, and connecting the negative terminal of the external power source to a metal needle. The metal needle is then inserted subcutaneously. When the external power source provides electrical energy, a release circuit is formed between the release area (positive terminal) and the metal needle (negative terminal) through the patient's body, causing the release area to ionize and dissolve, thus completing the release. Electrical release is usually successful; however, the high resistance between the positive and negative terminals through the body results in a long release time. Furthermore, individual patient differences lead to varying release times, and the subcutaneous insertion of the metal needle causes additional trauma to the patient. Summary of the Invention

[0005] The purpose of this invention is to provide a push rod, a release device, and a medical device. After pushing a medical implant to the lesion site, the push rod can quickly disconnect the two by electrical release, and the push rod also has good pushing performance.

[0006] To achieve the above objectives, the present invention provides a push rod, comprising a first conductor and a second conductor; wherein the first conductor has an axially extending inner cavity and includes a conductive tube and a conductive spring, the proximal end of the conductive spring being electrically connected to the distal end of the conductive tube; the second conductor is at least partially inserted into the inner cavity and is non-electrically connected to the first conductor, and the distal end of the second conductor is provided with a release zone.

[0007] Optionally, the distal end of the second conductor extends from the distal end of the inner cavity, and the release area is located outside the first conductor; an insulating structure is provided between the portion of the second conductor located in the inner cavity and the first conductor.

[0008] Optionally, the second conductor includes a first sub-conductor and a second sub-conductor; the proximal end of the first sub-conductor is disposed in the inner cavity, and the distal end of the first sub-conductor is provided with the release region; the distal end of the second sub-conductor is disposed in the inner cavity and electrically connected to the proximal end of the first sub-conductor, and the distal end of the second sub-conductor is also non-electrically connected to the first conductor through the insulating structure, and the proximal end of the second sub-conductor extends from the proximal end of the inner cavity.

[0009] Optionally, the proximal end of the first sub-conductor is provided with an electrical connection region, and the proximal end of the first sub-conductor is attached to the outer surface of the distal end of the second sub-conductor, and the electrical connection region is in contact with the second sub-conductor;

[0010] The insulating structure includes an insulating coating and an insulating sleeve; the insulating coating is applied to the outer surface of the first sub-conductor, excluding the release area and the electrical connection area; the insulating sleeve covers at least the distal outer surface of the second sub-conductor and the proximal outer surface of the first sub-conductor, and presses against the first sub-conductor; the insulating sleeve is also connected to the inner wall of the first conductor.

[0011] Optionally, the conductive tube includes a first sub-conductive tube and a second sub-conductive tube, the distal end of the second sub-conductive tube is fitted onto the proximal outer surface of the first sub-conductive tube, the proximal end face of the first sub-conductive tube abuts against the insulating sleeve, and the distal end of the first sub-conductive tube is electrically connected to the proximal end of the conductive spring.

[0012] Optionally, the push rod further includes an insulating sleeve connected to the distal end of the conductive tube and covering at least a portion of the outer surface of the conductive spring.

[0013] Optionally, the conductive spring has a uniform pitch, or the pitch of the conductive spring increases from the proximal end to the distal end.

[0014] Optionally, the conductive spring has a uniform outer diameter, or the outer diameter of the conductive spring decreases from the proximal end to the distal end.

[0015] Optionally, the push rod further includes a developing element for displaying the position of the distal end of the push rod.

[0016] Optionally, the developing element is disposed on at least a portion of the outer surface of the conductive spring.

[0017] To achieve the above objectives, the present invention also provides a release device, comprising a push rod as described in any of the preceding claims and a power source, the power source being used to supply power to the push rod to form a release circuit between the first conductor and the second conductor.

[0018] Optionally, the negative terminal of the power supply and the first conductor form a negative circuit, and the positive terminal of the power supply and the second conductor form a positive circuit; when the decomposition zone is located in a dielectric solution environment, the negative circuit and the positive circuit are connected to form a decomposition loop.

[0019] To achieve the above objectives, the present invention also provides a medical device comprising a push rod as described in any of the preceding claims and a medical implant, wherein the medical implant is connected to the distal end of the second conductor.

[0020] Compared with the prior art, the push rod, release device, and medical device of the present invention have the following advantages:

[0021] The aforementioned push rod includes a first conductor and a second conductor. The first conductor has an axially extending inner cavity and includes a conductive tube and a conductive spring. The proximal end of the conductive spring is electrically connected to the distal end of the conductive tube. The second conductor is at least partially inserted into the inner cavity and is non-electrically connected to the first conductor. The distal end of the second conductor has a release zone. The distal end of the second conductor of the push rod is used to connect to a medical implant. Thus, the push rod can push the medical implant to a target position in the patient's body. Then, the proximal ends of the first and second conductors are connected to the negative and positive terminals of an external power source, respectively, and a release circuit is formed under the action of an electrolyte, such as bodily fluid. Subsequently, the release zone of the push rod is broken by electrolysis, thereby detaching the push rod from the medical implant. The push rod integrates the first and second conductors into one unit, which can effectively reduce the resistance during electrolysis, shorten the dissolution time, and reduce the impact of individual patient differences on the electrolysis process. Furthermore, the conductive spring connected to the distal end of the conductive tube can improve the flexibility of the push rod, enabling it to smoothly pass through tortuous blood vessels and push the medical implant to the target position. Attached Figure Description

[0022] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0023] Figure 1 This is a schematic diagram of the push rod structure provided by the present invention according to an embodiment;

[0024] Figure 2This is a schematic diagram of the push rod being connected to a medical implant according to an embodiment of the present invention;

[0025] Figure 3a This is a schematic diagram of the conductive spring of the push rod provided according to an embodiment of the present invention. The conductive spring has a uniform outer diameter, but the pitch of the conductive spring increases from the proximal end to the distal end.

[0026] Figure 3b This is a schematic diagram of the conductive spring of the push rod according to an embodiment of the present invention. In the figure, the outer diameter of the conductive spring decreases continuously from the proximal end to the distal end.

[0027] Figure 3c This is a schematic diagram of the conductive spring of the push rod provided according to an embodiment of the present invention. In the figure, the outer diameter of the conductive spring decreases in a stepwise manner from the proximal end to the distal end, and the pitch of the conductive spring increases from the proximal end to the distal end.

[0028] Figure 3d This is a schematic diagram of the conductive spring of the push rod provided according to an embodiment of the present invention. In the figure, the outer diameter of the conductive spring decreases in a stepwise manner from the proximal end to the distal end, and the conductive spring has a uniform pitch.

[0029] Figure 4 This is a schematic diagram of the connection relationship between the conductive spring of the push rod and the first sub-conductive tube according to an embodiment of the present invention. In the figure, the proximal end face of the conductive spring is in contact with the distal end face of the first sub-conductive tube.

[0030] Figure 5 This is a schematic diagram of the connection relationship between the conductive spring of the push rod and the first sub-conductive tube according to an embodiment of the present invention. In the figure, the proximal end of the conductive spring is fitted onto the outer surface of the distal end of the first sub-conductive tube.

[0031] Figure 6 This is a partial structural schematic diagram of the push rod provided according to an embodiment of the present invention;

[0032] Figure 7a This is a schematic diagram of the structure of the second sub-conductor of the push rod according to an embodiment of the present invention. The second sub-conductor has a uniform outer diameter.

[0033] Figure 7b This is a schematic diagram of the structure of the second sub-conductor of the push rod according to an embodiment of the present invention. In the figure, the outer diameter of the second sub-conductor decreases continuously from the proximal end to the distal end.

[0034] Figure 7c This is a schematic diagram of the structure of the second sub-conductor of the push rod according to an embodiment of the present invention. In the figure, the outer diameter of the second sub-conductor decreases in a stepwise manner from the proximal end to the distal end.

[0035] Figure 7d This is a schematic diagram of the structure of the second sub-conductor of the push rod according to an embodiment of the present invention. The proximal portion of the second sub-conductor has a uniform outer diameter, and the outer diameter of the distal portion continuously decreases from the proximal end to the distal end.

[0036] Figure 8a This is a schematic diagram of the developing element of the push rod according to an embodiment of the present invention, wherein the developing element is a developing ring;

[0037] Figure 8b This is a schematic diagram of the developing element of the push rod according to an embodiment of the present invention. The developing element in the figure is a helical spring structure.

[0038] [The annotations in the attached figures are explained below]:

[0039] 10-Push rod, 100-First conductor, 101-Inner cavity, 110-Conductive tube, 111-First sub-conductive tube, 112-Second sub-conductive tube, 120-Conductive spring, 200-Second conductor, 201-Release zone, 202-Electrical connection zone, 210-First sub-conductive tube, 211-First segment, 212-Second segment, 213-Third segment, 220-Second sub-conductive tube, 300-Insulating structure, 310-Insulating coating, 320-Insulating sleeve, 400-Insulating sheath, 500-Developing element;

[0040] 20-Medical implants. Detailed Implementation

[0041] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0042] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0043] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “a plurality” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can represent internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0045] Figure 1 This is a schematic diagram of the push rod 10 provided in an embodiment of the present invention. Figure 1 As shown, the push rod 10 includes a first conductor 100 and a second conductor 200. The first conductor 100 has an inner cavity 101 extending through it along its axial direction, and includes a conductive tube 110 and a conductive spring 120, with the proximal end of the conductive spring 120 electrically connected to the distal end of the conductive tube 110. The second conductor 200 is at least partially disposed within the inner cavity 101, and is also non-electrically connected to the first conductor 100, with a release region 201 provided at its distal end.

[0046] Please continue to refer to this. Figure 1 and combined Figure 2The distal end of the second conductor 200 of the push rod 10 is used to connect to a medical implant 20, and the push rod 10 is used to push the medical implant 20 along the delivery sheath to a target location in the patient's body. The medical implant includes, but is not limited to, embolization coils, and the target location can be the aneurysm cavity. After the push rod 10 pushes the medical implant 20 into the aneurysm cavity, the proximal ends of the first conductor 100 and the second conductor 200 can be connected to the negative and positive terminals of a power source located outside the patient's body, respectively, and the power source supplies power to the push rod 10. Then, under the action of bodily fluids, such as blood, a release circuit is formed between the first conductor 100 and the second conductor 200. The release region 201 of the second conductor 200 undergoes ionization and dissolution until the second conductor 200 breaks at the release region 201, thereby detaching the second conductor 200 from the medical implant 20 and allowing the medical implant 20 to remain in the aneurysm cavity.

[0047] In this embodiment of the invention, by integrating the first conductor 100 and the second conductor 200 into one unit, it is unnecessary to construct a release circuit by inserting a metal needle under the patient's skin and using the metal needle as an electrode. This reduces patient pain and unnecessary trauma, and also shortens the distance between the positive and negative electrodes of the push rod 10, reducing resistance, shortening the electrical release time, and minimizing the impact of individual patient differences on the electrical release time. Furthermore, the conductive spring 120 improves the flexibility of the push rod 10, giving it good bending performance, enabling it to smoothly pass through tortuous blood vessels and deliver the medical implant 20 to the target location.

[0048] More specifically, the distal end of the second conductor 200 extends from the distal end of the inner cavity 101, such that the release zone 201 is located outside the first conductor 100. Furthermore, within the inner cavity 101, the second conductor 200 and the first conductor 100 are electrically isolated by an insulating structure 300 to prevent short circuits between them. Additionally, the proximal end of the second conductor 200 can extend from the proximal end of the inner cavity 101 and is used to connect to the positive terminal of the power supply. Thus, when the power supply provides electrical energy to the push rod 10, the first conductor 100 is connected to the negative terminal of the power supply, and the proximal end of the second conductor 200 is connected to the positive terminal of the power supply. The current flow path is: inside the power supply—proximal end of the second conductor—release zone—body fluid—first conductor—inside the power supply, allowing for smooth electrical release.

[0049] Furthermore, the second conductor 200 can also be non-electrically connected to the first conductor 100 through the insulating structure 300.

[0050] Furthermore, the push rod 10 may also include an insulating sleeve 400, which is connected to the distal end of the conductive tube 110 and covers at least a portion of the outer surface of the conductive spring 120. This has the advantages of increasing the stiffness of the push rod 10, preventing the conductive spring 120 from bending under axial compressive force, and also preventing the conductive spring 120 from unwinding. Additionally, it allows the push rod 10 to have a smooth distal outer surface, reducing resistance during the pushing process.

[0051] Furthermore, the push rod 10 may also include a contrast-enhancing element 500, which is used to display the position of the distal end of the push rod 10 within the patient's body, thereby determining whether the medical implant 20 has reached the target position. Specifically, during the pushing of the medical implant 20, the contrast-enhancing element cooperates with the contrast-enhancing mark on the delivery sheath to determine the position of the distal end of the push rod 10. For example, when the contrast-enhancing element 500 coincides with the contrast-enhancing mark at the distal end of the delivery sheath, it can be determined that the distal end of the push rod 10 has reached the aneurysm neck and that the medical implant 20 has completely entered the aneurysm cavity.

[0052] Next, the push rod 10 will be described in further detail with reference to the accompanying drawings. Those skilled in the art will understand that the following structure is merely a preferred embodiment of the push rod 10, and not a necessary structure, and therefore should not be construed as unduly limiting the present invention.

[0053] Please continue to refer to this. Figure 1 and Figure 2 The conductive tube 110 of the first conductor 100 includes a first sub-conductive tube 111 and a second sub-conductive tube 112, and the distal end of the second sub-conductive tube 112 is electrically connected to the proximal end of the first sub-conductive tube 111.

[0054] In detail, the first sub-conductive tube 111 is a hollow metal tube, preferably made of 304 stainless steel. The outer diameter of the first sub-conductive tube 111 is 0.20mm–0.50mm, the inner diameter is 0.10mm–0.40mm, and the axial length is 1400mm–2000mm. The second sub-conductive tube 112 is also a hollow metal tube, preferably made of 304 stainless steel. The outer diameter of the second sub-conductive tube 112 is 0.25mm–0.55mm, the inner diameter is 0.20mm–0.50mm, and the axial length is 15mm–50mm. During assembly, the proximal end of the first sub-conductive tube 111 is inserted into the distal end of the second sub-conductive tube 112, so that the proximal end face of the first sub-conductive tube 111 is located inside the second sub-conductive tube 112, and the first sub-conductive tube 111 and the second sub-conductive tube 112 remain relatively fixed. In practice, the two can also be bonded together with conductive adhesive.

[0055] The conductive spring 120 is made of wound metal wire, which can be made of 304 stainless steel, and the diameter of the metal wire is 0.04mm to 0.10mm. The outer diameter of the conductive spring 120 is 0.20mm to 0.50mm, and the conductive spring 120 can have a uniform outer diameter throughout its axial length (e.g., Figure 3a As shown), it can also have a non-uniform outer diameter (such as...). Figure 3b , Figure 3c and Figure 3d As shown), the outer diameter of the conductive spring 120 decreases from the proximal end to the distal end, so that the push rod 10 can adapt to changes in the diameter of the blood vessel. Here, the outer diameter of the conductive spring 120 can be continuously reduced (e.g., Figure 3b (as shown), or the outer diameter of the conductive spring 120 can vary in a stepped manner, and the outer diameter changes continuously between two adjacent steps (e.g. Figure 3c and Figure 3d (As shown). The axial length of the conductive spring 120 is 300mm to 600mm. Furthermore, the conductive spring 120 can have a uniform pitch throughout its entire axial length (e.g., ...). Figure 3b and Figure 3d As shown), it can also have a non-uniform pitch (such as...). Figure 3a and Figure 3c (As shown). When the conductive spring 120 has a uniform pitch, the compliance of the conductive spring 120 decreases from the proximal end to the distal end; when the conductive spring 120 has a non-uniform pitch, it is preferable that the pitch of the conductive spring 120 increases from the proximal end to the distal end, so that the compliance of the conductive spring 120 is enhanced from the proximal end to the distal end. In some other embodiments, the compliance of the conductive spring 120 at the proximal end and the distal end is consistent.

[0056] The proximal end of the conductive spring 120 can be connected to the distal end of the conductive tube 110, specifically the first sub-conductive tube 111 (e.g., Figure 1 , Figure 2 and Figure 4 As shown), or the proximal end of the conductive spring 120 can be fitted onto the distal outer surface of the first sub-conductive tube 111 (as shown). Figure 5 (As shown). In some embodiments, the proximal end of the conductive spring 120 is connected to the distal end of the first sub-conductive tube 111 by means of welding, gluing, or other methods.

[0057] The insulating sleeve 400 is made of materials including, but not limited to, PI (polyimide), PE (polyethylene), PTFE (polytetrafluoroethylene), and PET (polyethylene terephthalate). The inner diameter of the insulating sleeve 400 can be 0.20 mm to 0.50 mm, and the outer diameter can be 0.25 mm to 0.55 mm. The proximal end of the insulating sleeve 400 is fitted onto the distal outer surface of the first sub-conductive tube 111, and the insulating sleeve 400 covers at least a portion of the outer surface of the conductive spring 120. The insulating sleeve 400 can be connected to the first sub-conductive tube 111 and the conductive spring 120 by heat shrinking.

[0058] like Figure 1 and Figure 6 As shown, the second conductor 200 includes a first sub-conductor 210 and a second sub-conductor 220. The first sub-conductor 210 is made of a metal with good conductivity, such as gold, silver, copper, platinum, or stainless steel, and has a diameter of 0.04 mm to 0.08 mm, meaning it is a relatively fine filament structure. The axial length of the first sub-conductor 210 is 1800 mm to 2200 mm. A release region 201 is provided at the distal end of the first sub-conductor 210, and the axial length of the release region 201 is approximately 0.01 mm to 0.08 mm. The proximal end of the first sub-conductor 210 is located within the inner cavity 101, and an electrical connection region 202 is also provided at the proximal end of the first sub-conductor 210, with an axial length of 2 mm to 20 mm.

[0059] Optionally, continue to refer to Figure 1 and Figure 6The first sub-conductor 210 has a stepped or Z-shaped structure and includes a first segment 211, a second segment 212, and a third segment 213 connected in sequence. The first segment 211 extends distally along the axial direction of the push rod 10 (i.e., the distal end of the first segment 211 is the distal end of the first sub-conductor 210), and preferably coincides with the axis of the push rod 10, and the release region 201 is provided on the distal end of the first segment 211. The third segment 213 extends proximally along the axial direction of the push rod 10 (i.e., the third segment 213 is the proximal end of the first sub-conductor 210), and has a predetermined distance from the axis of the push rod 10. That is, the second segment 212 is a transition region, so that the third segment 213 deviates from the axis of the push rod 10, thereby making the third segment 213 and the first segment 211 on different straight lines. The electrical connection region 202 is provided on the third segment 213.

[0060] The distal end of the second sub-conductor 220 is disposed within the inner cavity 101, and the outer peripheral surface of the second sub-conductor 220 abuts against the third segment 213 of the first sub-conductor 210, so that the second sub-conductor 220 contacts the electrical connection area 202. Thus, the aforementioned "predetermined distance" is the radius of the second sub-conductor 220. The distal end of the second sub-conductor 220 is also non-electrically connected to the first conductor 110 through the insulating structure 300, and the proximal end of the second sub-conductor 220 extends from the proximal end of the inner cavity 101. In some embodiments, the third segment 213 of the first conductive wire 210 may be wound around the second sub-conductor 220.

[0061] The second sub-conductor 220 is also made of a metal with good conductivity, such as 304 stainless steel. The axial length of the second sub-conductor 220 is 40mm–60mm, and its diameter is 0.15mm–0.45mm, meaning the second sub-conductor 220 is a rod-shaped component with a relatively large diameter. The second sub-conductor 220 can have a uniform diameter throughout its entire axial length (e.g., ...). Figure 7a(As shown). Alternatively, the second sub-conductor 220 may have a non-uniform diameter over its entire axial length, and preferably, the diameter of the second sub-conductor 220 decreases from the proximal end to the distal end. This is because the diameter of the distal end of the second sub-conductor 220 should be less than or equal to the internal diameter of the first sub-conductor tube 111, so that the distal end of the second sub-conductor 220 can be inserted into the interior of the first sub-conductor tube 111 and electrically connected to the proximal end of the first sub-conductor 210. Decreasing the diameter of the second sub-conductor 220 from the proximal end to the distal end improves the assembly feel when assembling the second sub-conductor 220 with the first sub-conductor tube 111 and prevents the second sub-conductor 220 from bending during insertion. Optionally, please refer to... Figure 7b The second sub-conductor 220 may have a continuously varying diameter, or as... Figure 7c As shown, the diameter of the second sub-conductor 220 varies in a stepped manner, or as... Figure 7d As shown, the proximal end of the second sub-conductor 220 has a uniform diameter, while the distal end of the second sub-conductor 220 has a continuously varying diameter.

[0062] The insulating structure 300 includes an insulating coating 310 and an insulating sleeve 320. The insulating coating 310 is applied to the outer surface of the first sub-conductor 210, excluding the release region 201 and the electrical connection region 202. Thus, when the electrical connection region 202 of the first sub-conductor 210 contacts the second sub-conductor 220, electrical conduction is possible between the electrical connection region 202 and the second sub-conductor 220, thereby electrically connecting the first sub-conductor 210 and the second sub-conductor 220. The insulating sleeve 320 is at least partially disposed within the inner cavity 101 and at least covers the distal outer surface of the second sub-conductor 220 (i.e., the outer peripheral surface and distal end face of the portion of the second sub-conductor 220 located in the inner cavity 101), and also covers the proximal outer surface of the first sub-conductor 210, specifically the outer surfaces of the second segment 212 and the third segment 213.

[0063] Furthermore, the insulating sleeve 320 presses against the first sub-conductor 210, so that the first sub-conductor 210 and the second sub-conductor 220 are radially fixed, thereby keeping the electrical connection area 202 in contact with the second sub-conductor 220. Additionally, the outer peripheral surface of the insulating sleeve 320 can be bonded to the inner wall of the conductive tube 110 with an adhesive, so that the distal end of the second sub-conductor 220 is non-electrically connected to the conductive tube 110 through the insulating sleeve 320. In this embodiment, the material of the insulating sleeve 320 includes, but is not limited to, PI (polyimide), PE (polyethylene), PTFE (polytetrafluoroethylene), and PET (polyethylene terephthalate). The inner diameter of the insulating sleeve 320 is 0.15mm to 0.45mm, and the outer diameter is 0.20mm to 0.50mm.

[0064] In addition, when assembling the push rod 10, the first conductor 110 can be assembled first, then the insulating sleeve 320 can be inserted into the inner cavity 101 from the proximal end, and finally the second conductor 120 can be assembled. Alternatively, after assembling the first conductor 110, the second conductor 120 and the insulating sleeve 320 can be assembled, and finally the second conductor 120 and the insulating sleeve 320 can be inserted into the inner cavity 101 as a whole from the proximal end. Furthermore, after the push rod 10 is assembled, adhesive is filled between the outer peripheral surface of the insulating sleeve 320 and the inner wall of the second sub-conductive tube 112 to bond the outer peripheral surface of the insulating sleeve 320 to the inner wall of the second sub-conductive tube 112.

[0065] The developing element 500 is made of a developing material, which can be a radiopaque metallic material, including but not limited to platinum-iridium alloy or platinum-tungsten alloy. The specific form of the developing element 500 is not particularly limited in this embodiment of the invention; for example, it can be a ring-shaped structure (e.g., Figure 8a As shown), it can also be a helical spring structure (such as...). Figure 8b (As shown). Preferably, the developing element 500 is fitted onto at least a portion of the outer surface of the conductive spring 120 and located inside the insulating sleeve 400, so that the radial dimension of the developing element 500 is relatively large, resulting in better developing effect. The outer diameter of the developing element 500 is 0.25mm to 0.55mm, and the inner diameter is 0.20mm to 0.50mm, specifically set according to the outer diameter of the conductive spring 120. The axial length of the developing element 500 is 2mm to 4mm. Additionally, when the developing element 500 is a helical spring structure, the helical spring structure can be formed by winding non-transparent wire with a diameter of 0.02mm to 0.04mm.

[0066] Furthermore, embodiments of the present invention also provide a release device, including a push rod as described above and a power source, wherein the power source is used to supply power to the push rod to form a release circuit between the first conductor and the second conductor.

[0067] In some embodiments, the negative terminal of the power supply and the first conductor form a negative circuit, and the positive terminal of the power supply and the second conductor form a positive circuit; when the decomposition zone is located in a dielectric solution environment, the negative circuit and the positive circuit are connected to form a decomposition loop.

[0068] Furthermore, embodiments of the present invention also provide a medical device, including a push rod and a medical implant as described above, wherein the medical implant is connected to the distal end of the second conductor.

[0069] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. A push rod, characterized in that, The device includes a first conductor, a second conductor, and an insulating sleeve; wherein the first conductor has an axially extending inner cavity and includes a conductive tube and a conductive spring, the proximal end of the conductive spring being electrically connected to the distal end of the conductive tube; the second conductor is at least partially disposed within the inner cavity and is non-electrically connected to the first conductor, and the distal end of the second conductor has a release region; the insulating sleeve is connected to the distal end of the conductive tube and covers at least a portion of the outer surface of the conductive spring; The second conductor includes a first sub-conductor and a second sub-conductor; the first sub-conductor includes a first segment, a second segment and a third segment connected in sequence, the first segment extends distally along the axial direction of the push rod and coincides with the axis of the push rod, and the first segment has the release area at its distal end; the third segment extends proximally along the axial direction of the push rod and has a predetermined distance from the axis of the push rod; the third segment is located on a different straight line from the first segment; and the third segment has an electrical connection area. The second sub-conductor is a rod-shaped component; the distal end of the second sub-conductor is disposed in the inner cavity, and the outer peripheral surface of the second sub-conductor is abutted against the third segment of the first sub-conductor, so that the second sub-conductor is electrically connected to the proximal end of the first sub-conductor; the distal end of the second sub-conductor is also non-electrically connected to the first conductor through an insulating structure, and the proximal end of the second sub-conductor extends from the proximal end of the inner cavity; The insulating structure includes an insulating coating and an insulating sleeve; the insulating coating is applied to the outer surface of the first sub-conductor, excluding the release area and the electrical connection area; the insulating sleeve covers at least the distal outer surface of the second sub-conductor and the outer surfaces of the second segment and the third segment, and presses against the first sub-conductor; the insulating sleeve is also connected to the inner wall of the first conductor. The conductive tube includes a first sub-conductive tube and a second sub-conductive tube. The distal end of the second sub-conductive tube is fitted onto the proximal outer surface of the first sub-conductive tube. The proximal end face of the first sub-conductive tube abuts against the insulating sleeve. The distal end of the first sub-conductive tube is electrically connected to the proximal end of the conductive spring.

2. The push rod according to claim 1, characterized in that, The conductive spring has a uniform pitch, or the pitch of the conductive spring increases from the proximal end to the distal end.

3. The push rod according to claim 1, characterized in that, The conductive spring has a uniform outer diameter, or the outer diameter of the conductive spring decreases from the proximal end to the distal end.

4. The push rod according to claim 1, characterized in that, The push rod also includes a developing element for displaying the position of the distal end of the push rod.

5. The push rod according to claim 4, characterized in that, The developing element is disposed on at least a portion of the outer surface of the conductive spring.

6. A release device, characterized in that, The device includes a push rod as described in any one of claims 1-5 and a power source, the power source being used to supply power to the push rod to form a release circuit between the first conductor and the second conductor.

7. The release device according to claim 6, characterized in that, The negative terminal of the power supply and the first conductor form a negative circuit, and the positive terminal of the power supply and the second conductor form a positive circuit; when the decomposition zone is located in a dielectric solution environment, the negative circuit and the positive circuit are connected to form a decomposition loop.

8. A medical device, characterized in that, It includes a push rod as described in any one of claims 1-5 and a medical implant, wherein the medical implant is connected to the distal end of the second conductor.

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