CN114246711A

CN114246711A - Push rod, releasing device and medical device

Info

Publication number: CN114246711A
Application number: CN202111459739.5A
Authority: CN
Inventors: 邓舒浩; 郭远益; 陈冰; 潘光亮
Original assignee: Microport Neurotech Shanghai Co Ltd
Current assignee: Microport Neurotech Shanghai Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-03-29
Also published as: WO2023098380A1

Abstract

The invention provides a push rod, a release device and a medical device, wherein the push rod comprises a first electric conductor and a second electric conductor; the first conductor is provided with an inner cavity which extends in an axial direction in a penetrating manner, and comprises a conductive tube and a conductive spring, wherein the near end of the conductive spring is electrically connected with the far end of the conductive tube; the second electric conductor is at least partially arranged in the inner cavity in a penetrating mode and is in non-electric connection with the first electric conductor, and a releasing area is arranged at the far end of the second electric conductor. The push rod can be used for quickly carrying out electrolytic stripping and has good push performance.

Description

Push rod, releasing device and medical device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a push rod, a release device and a medical device.

Background

With the development of medical science and technology, intravascular interventional therapy is gradually emerging, and people pay attention and pay attention to the intravascular interventional therapy due to the advantages of small wound, small risk, few complications and the like.

The principle of intravascular interventional therapy is that a delivery path is built through a human blood vessel path, then a pushing device delivers a medical implant to a lesion part, and finally the medical implant is released to the lesion part for treatment. The connection between the pushing device and the medical implant is therefore of great importance, both to maintain an effective connection between the medical implant and the pushing device during the delivery process and to be able to release the connection between the medical implant and the pushing device smoothly after the medical implant has reached the lesion.

In the field of interventional treatment of aneurysms, the connection between the pusher and the medical implant is dominated by mechanical and electrical detachment. The principle of electrolytic detachment is that a detachment area between the medical implant and the pushing device is connected with the positive electrode of an external power supply, the negative electrode of the external power supply is connected with the metal needle, the metal needle is inserted into the subcutaneous part of a patient, when the external power supply supplies electric energy, a detachment loop is formed between the detachment area (the positive electrode) and the metal needle (the negative electrode) through the body of the patient, the detachment area is ionized and dissolved, and detachment is completed. The way of electrolysis is generally successful, but a loop is formed between the positive electrode and the negative electrode through a human body, the resistance between the positive electrode and the negative electrode is too large, so the time for electrolysis is long, the time for electrolysis of different patients is variable due to differences of individual patients, and in addition, extra trauma is brought to the patients due to the subcutaneous insertion of the metal needle.

Disclosure of Invention

The invention aims to provide a pushing rod, a releasing device and a medical device, wherein the pushing rod can quickly release connection of a medical implant and a diseased region through an electrolytic releasing mode after the medical implant is pushed to the diseased region, and the pushing rod also has good pushing performance.

In order to achieve the above object, the present invention provides a push rod comprising a first conductor and a second conductor; the first conductor is provided with an inner cavity which extends in an axial direction in a penetrating manner, and comprises a conductive tube and a conductive spring, wherein the near end of the conductive spring is electrically connected with the far end of the conductive tube; the second electric conductor is at least partially arranged in the inner cavity in a penetrating mode and is in non-electric connection with the first electric conductor, and a releasing area is arranged at the far end of the second electric conductor.

Optionally, the distal end of the second electrical conductor extends from the distal end of the lumen with the relief region external to the first electrical conductor; an insulating structure is arranged between the part of the second electric conductor in the inner cavity and the first electric conductor.

Optionally, the second electrical conductor comprises a first sub-conductor and a second sub-conductor; the proximal end of the first sub-electric conductor is arranged in the inner cavity, and the distal end of the first sub-electric conductor is provided with the disengagement area; the distal end of the second sub-conductor is arranged in the inner cavity and is electrically connected with the proximal end of the first sub-conductor, the distal end of the second sub-conductor is also non-electrically connected with the first conductor through the insulation structure, and the proximal end of the second sub-conductor extends out of the proximal end of the inner cavity.

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 abuts against the distal outer surface of the second sub-conductor and makes the electrical connection region contact with the second sub-conductor;

the insulation structure comprises an insulation coating and an insulation isolation sleeve; the insulating coating is coated on the outer surface of the first sub-electric conductor except the release region and the electric connection region; the insulating isolation sleeve at least covers the outer surface of the far end of the second sub-conductor and the outer surface of the near end of the first sub-conductor and presses against the first sub-conductor, and the insulating isolation sleeve is further connected with the inner wall of the first conductor.

Optionally, the conductive tube includes a first sub conductive tube and a second sub conductive tube, a distal end of the second sub conductive tube is sleeved on an outer surface of a proximal end of the first sub conductive tube, a proximal end surface of the first sub conductive tube is abutted to the insulating isolation sleeve, and a distal end of the first sub conductive tube is electrically connected to a proximal end of the conductive spring.

Optionally, the push rod further comprises an insulating sheath, the insulating sheath is connected to the distal end of the conductive tube and covers at least part of the outer surface of the conductive spring.

Optionally, the electrically conductive spring has a uniform pitch, or the pitch of the electrically conductive spring increases in a proximal to distal direction.

Optionally, the conductive spring has a uniform outer diameter, or the outer diameter of the conductive spring decreases in a proximal to distal direction.

Optionally, the push rod further comprises a developing element for displaying the position of the distal end of the push rod.

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

To achieve the above object, the present invention further provides a releasing device, including the pushing rod as described in any one of the above and a power source for supplying power to the pushing rod to form a releasing loop between the first conductor and the second conductor.

Alternatively, the negative electrode of the power supply and the first conductor form a negative electrode circuit, and the positive electrode of the power supply and the second conductor form a positive electrode circuit; when the releasing area is positioned in a dielectric solution environment, the negative electrode circuit is communicated with the positive electrode circuit to form a releasing loop.

To achieve the above object, the present invention further provides a medical device, including the push rod according to any one of the above aspects and a medical implant, wherein the medical implant is connected to the distal end of the second electrical conductor.

Compared with the prior art, the push rod, the releasing device and the medical device have the following advantages:

the push rod comprises a first conductor and a second conductor, wherein the first conductor is provided with an inner cavity which extends through along the axial direction and comprises a conductive tube and a conductive spring, and the near end of the conductive spring is electrically connected with the far end of the conductive tube; the second electric conductor is at least partially arranged in the inner cavity in a penetrating mode and is in non-electric connection with the first electric conductor, and a releasing area is arranged at the far end of the second electric conductor. The distal end of the second conductor of the pushing rod is used for being connected with a medical implant, so that the pushing rod can push the medical implant to a target position in a patient body, then the proximal ends of the first conductor and the second conductor are respectively connected with the negative electrode and the positive electrode of an external power supply, a releasing loop is formed under the action of electrolyte, such as body fluid, and then a releasing area of the pushing rod is broken in an electrolytic manner, so that the pushing rod is disconnected with the medical implant. The first electric conductor and the second electric conductor are integrated into a whole by the push rod, so that the resistance during electrolysis can be effectively reduced, the electrolysis time is shortened, and the influence of individual difference of patients on the electrolysis process is reduced.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic diagram of a push rod according to an embodiment of the present invention;

FIG. 2 is a schematic view of a push rod according to one embodiment of the present invention in connection with a medical implant;

FIG. 3a is a schematic diagram of a conductive spring of a push rod according to an embodiment of the present invention, wherein the conductive spring has a uniform outer diameter, but the pitch of the conductive spring increases in a proximal direction to a distal direction;

FIG. 3b is a schematic diagram of a conductive spring of a push rod according to an embodiment of the present invention, wherein the outer diameter of the conductive spring decreases continuously in a proximal direction to a distal direction;

FIG. 3c is a schematic diagram of the structure of the conductive spring of the push rod according to an embodiment of the present invention, in which the outer diameter of the conductive spring is reduced in a stepwise manner in the proximal-to-distal direction, and the pitch of the conductive spring is increased in the proximal-to-distal direction;

FIG. 3d is a schematic diagram of the conductive spring of the push rod according to an embodiment of the present invention, in which the outer diameter of the conductive spring decreases stepwise from the proximal end to the distal end, and the conductive spring has a uniform pitch;

FIG. 4 is a schematic diagram illustrating a connection relationship between a conductive spring of a push rod and a first conductive sub-tube, wherein a proximal end surface of the conductive spring is abutted with a distal end surface of the first conductive sub-tube, according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a connection relationship between a conductive spring of a push rod and a first sub conductive tube according to an embodiment of the present invention, wherein a proximal end of the conductive spring is sleeved on an outer surface of a distal end of the first sub conductive tube;

FIG. 6 is a schematic diagram of a partial structure of a push rod according to an embodiment of the present invention;

FIG. 7a is a schematic diagram of a second sub-conductor of a push rod according to an embodiment of the present invention, wherein the second sub-conductor has a uniform outer diameter;

FIG. 7b is a schematic diagram of a second sub-conductor of the push rod according to one embodiment of the present invention, wherein the outer diameter of the second sub-conductor decreases continuously in a proximal-to-distal direction;

FIG. 7c is a schematic diagram of a second sub-conductor of the push rod according to one embodiment of the present invention, wherein the outer diameter of the second sub-conductor decreases stepwise from the proximal end to the distal end;

FIG. 7d is a schematic diagram of a second sub-conductor of the push rod according to one embodiment of the present invention, wherein the second sub-conductor has a proximal portion with a uniform outer diameter and a distal portion with a continuously decreasing outer diameter in a proximal-to-distal direction;

FIG. 8a is a schematic structural diagram of a developing member of a push rod according to an embodiment of the present invention, wherein the developing member is a developing ring;

fig. 8b is a structural diagram of a developing element of a push rod according to an embodiment of the present invention, wherein the developing element is a spiral spring structure.

[ reference numerals are described below ]:

10-push rod, 100-first electrical conductor, 101-lumen, 110-electrical conductor tube, 111-first sub-electrical conductor tube, 112-second sub-electrical conductor tube, 120-conductive spring, 200-second electrical conductor, 201-disengagement zone, 202-electrical connection zone, 210-first sub-electrical conductor, 211-first segment, 212-second segment, 213-third segment, 220-second sub-electrical conductor, 300-insulation structure, 310-insulation coating, 320-insulation isolation sleeve, 400-insulation sheath, 500-development element;

20-medical implant.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

Fig. 1 is a schematic structural diagram of a push rod 10 according to an embodiment of the present invention. As shown in fig. 1, the push rod 10 includes a first conductor 100 and a second conductor 200. The first conductor 100 has a lumen 101 extending axially therethrough, and the first conductor 100 includes a conductive tube 110 and a conductive spring 120, wherein a proximal end of the conductive spring 120 is electrically connected to a distal end of the conductive tube 110. The second conductive body 200 is at least partially inserted into the inner cavity 101, the second conductive body 200 is further non-electrically connected to the first conductive body 100, and a distal end of the second conductive body 200 is provided with a release region 201.

With continued reference to fig. 1 in conjunction with fig. 2, the distal end of the second conductive body 200 of the push rod 10 is adapted to be connected to a medical implant 20, and the push rod 10 is adapted to push the medical implant 20 along the delivery sheath to a target site in the patient, including but not limited to an embolic coil, which may be the lumen of an aneurysm. After the pushing rod 10 pushes the medical implant 20 into the tumor cavity, the proximal ends of the first conductor 100 and the second conductor 200 can be respectively connected to the negative electrode and the positive electrode of a power supply located outside the patient body, and the power supply supplies power to the pushing rod 10. Then, under the action of body fluid such as blood, a release loop is formed between the first conductive body 100 and the second conductive body 200, and the release region 201 of the second conductive body 200 is ionized and dissolved until the second conductive body 200 is broken at the release region 201, so that the second conductive body 200 is disconnected from the medical implant 20 and the medical implant 20 is allowed to remain in the tumor cavity.

In the embodiment of the present invention, by integrating the first conductive body 100 and the second conductive body 200 into a whole, there is no need to construct a release loop by inserting a metal needle under the skin of a patient and using the metal needle as an electrode, so as to reduce the pain of the patient and reduce unnecessary trauma on the one hand, and on the other hand, shorten the distance between the positive electrode and the negative electrode of the push rod 10, reduce the resistance, shorten the time for releasing, and also reduce the influence of individual differences of the patient on the time for releasing. And, the conductive spring 120 also improves the flexibility of the push rod 10, so that the push rod 10 has good bending performance, can smoothly pass through tortuous vessels, and can deliver the medical implant 20 to the target position.

In more detail, the distal end of the second electrical conductor 200 extends from the distal end of the lumen 101 such that the disengagement zone 201 is located outside the first electrical conductor 100. In the cavity 101, the second conductive body 200 is electrically isolated from the first conductive body 100 by an insulating structure 300, so as to prevent a short circuit from occurring between the first conductive body 100 and the second conductive body 200. In addition, the proximal end of the second electrical conductor 200 may extend from the proximal end of the lumen 101 and be used for connection to the positive pole of the power source. Thus, when the power supply supplies electric energy to the push rod 10, the first conductor 100 is connected to the negative electrode of the power supply, the proximal end of the second conductor 200 is connected to the positive electrode of the power supply, and the current flow path is: the power supply interior-the second conductor proximal end-the disengagement zone-the body fluid-the first conductor-the power supply interior, so that the electrolytic disengagement is smoothly performed.

In addition to this, the second conductor 200 may be electrically connected to the first conductor 100 through the insulating structure 300.

In addition, the push rod 10 may further include an insulating sheath 400, wherein the insulating sheath 400 is connected to the distal end of the conductive tube 110 and covers at least a part of the outer surface of the conductive spring 120. This has the advantages of improving the rigidity of the push rod 10, preventing the conductive spring 120 from bending when subjected to an axial pressing force, and also preventing the conductive spring 120 from unwinding, and enabling the push rod 10 to have a smooth outer surface at the distal end, thereby reducing the resistance during pushing.

And, the pushing rod 10 may further include a visualization element 500, and the visualization element 500 is used to display the position of the distal end of the pushing rod 10 in the patient, so as to determine whether the medical implant 20 reaches the target position. Specifically, during the process of pushing the medical implant 20, the developing element cooperates with the developing mark on the delivery sheath to determine the position of the distal end of the pushing rod 10, for example, when the developing element 500 coincides with the developing mark on the distal end of the delivery sheath, it can be determined that the distal end of the pushing rod 10 reaches the tumor neck, and the medical implant 20 completely enters the tumor cavity.

Next, the push rod 10 will be described in further detail with reference to the accompanying drawings. It will be understood by those skilled in the art that the following configuration is merely a preferred embodiment of the push rod 10 and is not necessarily the configuration used and should not be construed to unduly limit the invention.

With reference to fig. 1 and fig. 2, the conductive tube 110 of the first conductive body 100 includes a first sub conductive tube 111 and a second sub conductive tube 112, and a distal end of the second sub conductive tube 112 is electrically connected to a proximal end of the first sub conductive tube 111.

In detail, the first sub conductive pipe 111 is a hollow metal pipe, and the material thereof is preferably 304 stainless steel. The first sub conductive tube 111 has an outer diameter of 0.20mm to 0.50mm, an inner diameter of 0.10mm to 0.40mm, and an axial length of 1400mm to 2000 mm. The second sub conductive tube 112 is also a hollow metal tube, and the material thereof is preferably 304 stainless steel. The second sub conductive tube 112 has an outer diameter of 0.25mm to 0.55mm, an inner diameter of 0.20mm to 0.50mm, and an axial length of 15mm to 50 mm. During assembly, the proximal end of the first sub conductive tube 111 is inserted into the second sub conductive tube 112 from the distal end of the second sub conductive tube 112, such that the proximal end surface 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 are relatively fixed. In practice, the two can also be bonded by conductive glue.

The conductive spring 120 is made of a wire wound with a diameter of 0.04mm to 0.10mm, and may be made of 304 stainless steel. The conductive spring 120 has an outer diameter of 0.20-0.50 mm, and the conductive spring 120 may have a uniform outer diameter (as shown in fig. 3 a) or a non-uniform outer diameter (as shown in fig. 3b, 3c, and 3 d) over the entire axial length thereof, and the outer diameter of the conductive spring 120 decreases in a proximal-to-distal direction, so that the push rod 10 can adapt to the change in the diameter of the blood vessel. Here, the outer diameter of the conductive spring 120 may be continuously decreased (as shown in fig. 3 b), or the outer diameter of the conductive spring 120 may be changed in a stepwise manner, and the outer diameter between two adjacent steps is continuously changed (as shown in fig. 3c and 3 d). The axial length of the conductive spring 120 is 300mm to 600 mm. Also, the conductive spring 120 may have a uniform pitch throughout its axial length (as shown in fig. 3b and 3 d) or a non-uniform pitch (as shown in fig. 3a and 3 c). When the conductive spring 120 has a uniform pitch, the compliance of the conductive spring 120 decreases in the proximal to distal direction; when the conductive spring 120 has a non-uniform pitch, it is preferable that the pitch of the conductive spring 120 increases in the proximal-to-distal direction, so that the compliance of the conductive spring 120 increases in the proximal-to-distal direction. In other embodiments, the compliance of the proximal and distal ends of the conductive spring 120 is consistent.

The proximal end of the conductive spring 120 may be abutted with the distal end of the conductive tube 110, specifically, the first sub conductive tube 111 (as shown in fig. 1, 2 and 4), or the proximal end of the conductive spring 120 may be sleeved on the outer surface of the distal end of the first sub conductive tube 111 (as shown in fig. 5). In some embodiments, the proximal end of the conductive spring 120 and the distal end of the first sub-conductive tube 111 are connected by welding, gluing, or the like.

The material of the insulating sheath 400 includes, but is not limited to, PI (polyimide), PE (polyethylene), PTFE (polytetrafluoroethylene), PET (polyethylene terephthalate). The inner diameter of the insulating sheath 400 may be 0.20mm to 0.50mm, and the outer diameter may be 0.25mm to 0.55 mm. The proximal end of the insulating sheath 400 is sleeved on the outer surface of the distal end of the first sub-conductive tube 111, and the insulating sheath 400 covers at least part of the outer surface of the conductive spring 120. The insulating sheath 400 may be connected with the first sub conductive pipe 111 and the conductive spring 120 by means of heat shrinkage.

As shown in fig. 1 and 6, the second conductor 200 includes a first sub-conductor 210 and a second sub-conductor 220. The material of the first sub-conductor 210 is a metal with good electrical conductivity, such as gold, silver, copper, platinum, stainless steel, etc., and the diameter thereof is 0.04mm to 0.08mm, that is, the first sub-conductor 210 has a thin wire-like structure. The axial length of the first sub-conductor 210 is 1800mm to 2200 mm. The distal end of the first sub-conductor 210 is provided with the disengagement region 201, and the axial length of the disengagement region 201 is about 0.01mm to 0.08 mm. The proximal end of the first sub-conductor 210 is disposed in the inner cavity 101, and the proximal end of the first sub-conductor 210 is further disposed with an electrical connection region 202, and the axial length of the electrical connection region 202 is 2mm to 20 mm.

Alternatively, with continued reference to fig. 1 and 6, the first sub-conductor 210 has a step-type or Z-type structure and includes a first segment 211, a second segment 212 and a third segment 213 connected in sequence. The first segment 211 extends along the axial direction of the push rod 10 to the far end (that is, the far end of the first segment 211 is the far end of the first sub-conductor 210), and preferably coincides with the axial line of the push rod 10, and the far end of the first segment 211 is provided with the disengagement area 201. 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, i.e., the second segment 212 is a transition region, such that the third segment 213 is offset from the axis of the push rod 10, such that the third segment 213 is in a different line from the first segment 211. The electrical connection region 202 is provided on the third segment 213.

The distal end of the second sub-conductor 220 is disposed in 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 region 202, and 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 electrically connected to the first conductor 110 through the insulation structure 300, and the proximal end of the second sub-conductor 220 extends from the proximal end of the lumen 101. In some embodiments, the third segment 213 of the first conductive filament 210 may be wrapped around the second sub-conductor 220.

The second sub-conductor 220 is also a metal with better conductivity, such as 304 stainless steel. The axial length of the second sub-conductor 220 is 40mm to 60mm, and the diameter is 0.15mm to 0.45mm, that is, the second sub-conductor 220 is a rod-shaped member with a large diameter. The second subconductor 220 may have a uniform diameter throughout its axial length (as shown in fig. 7 a). Or the second sub-conductor 220 has a non-uniform diameter over the entire axial length thereof, and preferably the diameter of the second sub-conductor 220 decreases in the proximal to distal direction, because the diameter of the distal end of the second sub-conductor 220 should be smaller than or equal to the inside of the first sub-conductor tube 111, so that the distal end of the second sub-conductor 220 can be inserted into the inside of the first sub-conductor tube 111 and electrically connected to the proximal end of the first sub-conductor 210, and the diameter of the second sub-conductor 220 decreases in the proximal to distal direction, which can improve the assembly feel and prevent the second sub-conductor 220 from being bent during the insertion process when the second sub-conductor 220 and the first sub-conductor tube 111 are assembled. Alternatively, referring to fig. 7b, the second sub-conductor 220 may have a continuously changing diameter, or as shown in fig. 7c, the diameter of the second sub-conductor 220 changes stepwise, or as shown in fig. 7d, the proximal end of the second sub-conductor 220 has a uniform diameter, and the distal end of the second sub-conductor 220 has a continuously changing diameter.

The insulation structure 300 includes an insulation coating 310 and an insulation spacer 320. The insulating coating 310 is coated on the outer surface of the first sub-conductor 210 except for the release region 201 and the electrical connection region 202, so that when the electrical connection region 202 of the first sub-conductor 210 contacts the second sub-conductor 220, electrical conduction can be achieved between the electrical connection region 202 and the second sub-conductor 220, and the first sub-conductor 210 is electrically connected to the second sub-conductor 220. The insulating isolation sleeve 320 is at least partially disposed in the inner cavity 101, and at least covers the outer surface of the distal end of the second sub-conductor 220 (i.e. the outer peripheral surface and the distal end surface of the portion of the second sub-conductor 220 located in the inner cavity 101), and also covers the outer surface of the proximal end of the first sub-conductor 210, specifically the outer surfaces of the second segment 212 and the third segment 213.

Furthermore, the insulating sleeve 320 presses against the first sub-conductor 210 to keep the first sub-conductor 210 fixed relative to the second sub-conductor 220 in the radial direction, so that the electrical connection region 202 is kept in contact with the second sub-conductor 220. And, the outer circumference of the insulating spacer 320 may be further bonded to the inner wall of the conductive tube 110 by 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 spacer 320. In this embodiment, the insulating spacer 320 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 isolation sleeve 320 is 0.15 mm-0.45 mm, and the outer diameter is 0.20 mm-0.50 mm.

In addition, when assembling the push rod 10, the first conductive body 110 may be assembled, the insulating isolation sleeve 320 may be assembled into the inner cavity 101 from the proximal end of the inner cavity 101, and the second conductive body 120 may be assembled, or after the assembly of the first conductive body 110 is completed, the second conductive body 120 and the insulating isolation sleeve 320 may be assembled, and the second conductive body 120 and the insulating isolation sleeve 320 may be integrally assembled into the inner cavity 101 from the proximal end of the inner cavity 101. And after the rod 10 is assembled during pushing, an adhesive is filled between the outer circumferential surface of the insulating spacer 320 and the inner wall of the second sub conductive tube 112, so that the outer circumferential surface of the insulating spacer 320 is bonded to the inner wall of the second sub conductive tube 112.

The development element 500 is made of a development material, which may 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 in the embodiment of the present invention is not particularly limited, and may be, for example, a ring structure (as shown in fig. 8 a) or a coil spring structure (as shown in fig. 8 b). Preferably, the developing element 500 is sleeved on at least a part of the outer surface of the conductive spring 120 and is located inside the insulating sheath 400, so that the radial dimension of the developing element 500 is relatively large, and a good developing effect is achieved. 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, the outer diameter is set according to the conductive spring 120. The axial length of the developing member 500 is 2mm to 4 mm. In addition, when the developing element 500 is a coil spring structure, the coil spring structure may be wound from a radiopaque wire having a diameter of 0.02mm to 0.04 mm.

Further, an embodiment of the present invention further provides a releasing device, including the above-mentioned push rod and a power supply, where the power supply is configured to supply power to the push rod, so as to form a releasing loop between the first conductor and the second conductor.

In some embodiments, the negative electrode of the power supply and the first conductor form a negative electrode circuit, and the positive electrode of the power supply and the second conductor form a positive electrode circuit; when the releasing area is positioned in a dielectric solution environment, the negative electrode circuit is communicated with the positive electrode circuit to form a releasing loop.

Still further, embodiments of the present invention provide a medical device, including the above-mentioned push rod and a medical implant, where the medical implant is connected to the distal end of the second electrical conductor.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A push rod is characterized by comprising a first electric conductor and a second electric conductor; the first conductor is provided with an inner cavity which extends in an axial direction in a penetrating manner, and comprises a conductive tube and a conductive spring, wherein the near end of the conductive spring is electrically connected with the far end of the conductive tube; the second electric conductor is at least partially arranged in the inner cavity in a penetrating mode and is in non-electric connection with the first electric conductor, and a releasing area is arranged at the far end of the second electric conductor.

2. The push rod of claim 1, wherein the distal end of the second electrical conductor extends from the distal end of the lumen with the relief area outside of the first electrical conductor; an insulating structure is arranged between the part of the second electric conductor in the inner cavity and the first electric conductor.

3. The push rod of claim 2, wherein the second electrical conductor includes a first sub-electrical conductor and a second sub-electrical conductor; the proximal end of the first sub-electric conductor is arranged in the inner cavity, and the distal end of the first sub-electric conductor is provided with the disengagement area; the distal end of the second sub-conductor is arranged in the inner cavity and is electrically connected with the proximal end of the first sub-conductor, the distal end of the second sub-conductor is also non-electrically connected with the first conductor through the insulation structure, and the proximal end of the second sub-conductor extends out of the proximal end of the inner cavity.

4. The push rod of claim 3 wherein the proximal end of the first sub-conductor is provided with an electrical connection region, and the proximal end of the first sub-conductor abuts against the distal outer surface of the second sub-conductor and brings the electrical connection region into contact with the second sub-conductor;

5. The push rod as claimed in claim 4, wherein the conductive tube comprises a first sub conductive tube and a second sub conductive tube, the distal end of the second sub conductive tube is sleeved on the outer surface of the proximal end of the first sub conductive tube, the proximal end face of the first sub conductive tube abuts against the insulating spacer sleeve, and the distal end of the first sub conductive tube is electrically connected with the proximal end of the conductive spring.

6. The push rod of any one of claims 1-5 further comprising an insulating sheath coupled to the distal end of the conductive tube and covering at least a portion of the outer surface of the conductive spring.

7. The push rod of any one of claims 1-5, wherein the electrically conductive spring has a uniform pitch, or wherein the pitch of the electrically conductive spring increases in a proximal to distal direction.

8. The push rod of any one of claims 1-5, wherein the conductive spring has a uniform outer diameter, or wherein the outer diameter of the conductive spring decreases in a proximal to distal direction.

9. The push rod of claim 1, further comprising a visualization element for displaying the position of the distal end of the push rod.

10. The push rod of claim 9, wherein the developer element is disposed on at least a portion of an outer surface of the conductive spring.

11. A disconnecting device comprising a push rod according to any of claims 1-10 and a power source for supplying power to the push rod to form a disconnecting loop between the first and second electrical conductors.

12. The release device according to claim 11, wherein a negative electrode of the power supply and the first conductor constitute a negative electrode circuit, and a positive electrode of the power supply and the second conductor constitute a positive electrode circuit; when the releasing area is positioned in a dielectric solution environment, the negative electrode circuit is communicated with the positive electrode circuit to form a releasing loop.

13. A medical device comprising the push rod of any one of claims 1-10 and a medical implant, the medical implant being coupled to the distal end of the second electrical conductor.