A device for delivering a spring ring

Abstract

The application relates to the technical field of medical devices, and particularly discloses a spring coil conveying device. The spring coil conveying device comprises a conveying unit, a spring coil unit and a lead-in sheath unit, the proximal end of the spring coil unit is detachably connected with the distal end of the conveying unit; the distal end of the lead-in sheath tube is provided with a first taper tube, the tube diameter of the first taper tube gradually decreases from the proximal end to the distal end, the small-end of the first taper tube is convenient for being connected with a guide catheter, the large-end of the first catheter is connected with the lead-in sheath tube, the tube diameter of the lead-in sheath tube is slightly larger, the friction between the spring coil unit and the lead-in sheath tube is reduced, and then the spring coil unit is not easy to deform or break in the pushing process; the distal end of the lead-in sheath tube is provided with the first taper tube, the adaptability of the lead-in sheath tube and the guide catheter is improved, the conveying unit and the spring coil unit can be effectively connected in the process of entering the guide catheter, and the problem that the two cannot be pushed due to early separation is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and particularly relates to a delivery device of a spring coil. BACKGROUND

[0002] As an embolization device for treating aneurysm, the spring coil is one of the most effective treatment methods, and the spring coil must be released from the implantation site after being implanted in the target site. Usually, the number of spring coils used in one surgery is 5-7 on average. After a plurality of spring coils are wound and stacked, the release mode thereof needs to be light and convenient so as to avoid damaging the spring coils that have been inserted into the aneurysm. Therefore, the quick, safe and effective release of the spring coil plays a crucial role in the safety of the surgery and the life safety of the patient, and the release performance of the spring coil also becomes an important indicator for performance evaluation.

[0003] At present, the release of the spring coil mainly includes four types of release modes, i.e., electrical release, gas release, water release and mechanical release. Among them, the electrical release is to heat the electric heating part, so as to transfer heat to the core wire of the high molecular material in the inner cavity of the spring coil, so as to release the spring coil. The principle of the gas release is that the external inflation device inflates the cavity through the inflation sealing part, so that the elastic balloon inside is expanded and adheres to the inner cavity wall. Under the action of the elastic balloon, after the spring coil is delivered to the target site, the elastic balloon is retracted and withdrawn, and the release of the spring coil is realized. The water release is to inject a solvent into the delivery tube during the delivery process, so as to dissolve the fixed part by using the solvent, and realize the release of the spring coil. The mechanical release is to connect the proximal end of the spring coil with the component in the delivery system, and then the delivery system moves the spring coil in the catheter. When the spring coil reaches the target position, the delivery component in the delivery system is separated from the spring coil, and the spring coil is released.

[0004] Compared with the other three methods, the mechanical release does not need external energy transmission, simplifies the production process flow of the entire spring coil delivery system, reduces the energy consumption, and more importantly, greatly reduces the situation of surgical failure caused by the destructive nature of the device itself. Based on the above advantages, the mechanical release has become the mainstream release mode of the spring coil.

[0005] However, the mechanical release has disadvantages. During the pushing of the spring ring, the friction between the spring ring, the conveying component and the introduction sheath tube can cause the spring ring to be difficult to push, especially for the spring ring with large size and long length. The friction resistance can cause the spring ring to be difficult to push, and even can cause the spring ring to be broken. In addition, the sizes of the spring ring, the conveying component, the introduction sheath tube and the guide catheter have certain adaptability. If the inner diameter of the introduction sheath tube is too large, the spring ring and the conveying component can be released in advance during the conveying of the spring ring to the guide catheter, so that the spring ring cannot be continuously pushed and the spring ring conveying device is scrapped. If the inner diameter of the introduction sheath tube is too small, the above-mentioned excessive friction can occur, which is also not desirable.

[0006] Therefore, in view of the above-mentioned deficiencies, it is urgent to provide a spring ring conveying device to solve the above-mentioned problems. SUMMARY

[0007] The purpose of the present application is to provide a spring ring conveying device, which improves the adaptability of the spring ring unit and the conveying unit to the guide catheter, and is easy to push the spring ring unit and the conveying unit.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0009] A spring ring conveying device comprises:

[0010] a conveying unit;

[0011] a spring ring unit, a proximal end of the spring ring unit being releasably connected to a distal end of the conveying unit;

[0012] an introduction sheath unit comprising an introduction sheath tube, the spring ring unit and the conveying unit being arranged in the introduction sheath tube, a distal end of the introduction sheath tube being provided with a first taper tube, and a tube diameter of the first taper tube gradually decreasing from the proximal end to the distal end.

[0013] As a preferred technical solution of the above-mentioned spring ring conveying device, the tube diameter of the introduction sheath tube gradually increases from the proximal end to the distal end.

[0014] As a preferred technical solution of the above-mentioned spring ring conveying device, the introduction sheath tube comprises a conveying tube part and a straight tube part, the tube diameter of the straight tube part being smaller than the tube diameter of the conveying tube part, a distal end of the conveying tube part being connected to a proximal end of the first taper tube, and a proximal end of the conveying tube part being connected to a distal end of the straight tube part through a second taper tube.

[0015] As a preferred technical solution of the above-mentioned spring ring conveying device, the introduction sheath tube is provided with a limiting piece capable of positioning the conveying unit or the spring ring unit in the introduction sheath tube.

[0016] As a preferred technical scheme of the spring coil conveying device, the conveying unit comprises:

[0017] A push rod;

[0018] A flexible connecting assembly, a proximal end of the flexible connecting assembly is connected with a distal end of the push rod, and a distal end of the flexible connecting assembly is detachably connected with a proximal end of the spring coil unit.

[0019] As a preferred technical scheme of the spring coil conveying device, the push rod gradually decreases in diameter from the proximal end to the distal end.

[0020] As a preferred technical scheme of the spring coil conveying device, the flexible connecting assembly comprises:

[0021] A heat shrink tube, one end of the heat shrink tube is sleeved on the distal end of the push rod;

[0022] A conveying elastic member, a proximal end of the conveying elastic member is connected with the other end of the heat shrink tube, and a distal end of the conveying elastic member is detachably connected with the spring coil unit.

[0023] As a preferred technical scheme of the spring coil conveying device, the conveying elastic member comprises:

[0024] A conveying spring, a proximal end of the conveying spring is connected with the heat shrink tube;

[0025] A developing spring, a proximal end of the developing spring is connected with a distal end of the conveying spring, and the developing spring is coated with a developing agent.

[0026] As a preferred technical scheme of the spring coil conveying device, the spring coil unit comprises a spring coil, a proximal end of the spring coil is connected with a first interlocking member, and a distal end of the conveying unit is provided with a second interlocking member capable of being engaged with or separated from the first interlocking member.

[0027] As a preferred technical scheme of the spring coil conveying device, the limiting member is a locking thread arranged on the lead-in sheath.

[0028] The beneficial effects of the present application are as follows:

[0029] The spring ring conveying device provided by the application has the first taper pipe arranged at the distal end of the introduction sheath pipe, and the pipe diameter of the first taper pipe gradually decreases from the proximal end to the distal end, the small end of the first taper pipe is convenient to connect with the guide catheter, the large end of the first catheter is connected with the introduction sheath pipe, the pipe diameter of the introduction sheath pipe is arranged to be slightly larger, the friction between the spring ring unit and the introduction sheath pipe is reduced, and then the spring ring unit is not easy to deform or break in the pushing process; the first taper pipe arranged at the distal end of the introduction sheath pipe not only improves the adaptability of the introduction sheath pipe and the guide catheter, but also can ensure that the conveying unit and the spring ring unit can be effectively connected in the process of entering the guide catheter, so that the problem that the spring ring conveying device is scrapped due to the separation of the two units in advance and the pushing failure is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a partial structure schematic view of the spring ring conveying device provided by the embodiment of the application;

[0031] Figure 2 is a structure schematic view of the introduction sheath unit provided by the embodiment of the application;

[0032] Figure 3 is a partial schematic view of the flat tube part and the second taper pipe provided by the embodiment of the application;

[0033] Figure 4 is a structure schematic view of the conveying unit provided by the embodiment of the application;

[0034] Figure 5 is a structure schematic view of the second interlocking part and the developing spring provided by the embodiment of the application.

[0035] In the drawings:

[0036] 1, conveying unit; 2, spring ring unit; 3, introduction sheath unit;

[0037] 11, push rod; 12, flexible connection assembly; 121, heat shrink tube; 122, conveying spring; 123, developing spring; 13, second interlocking part;

[0038] 21, spring ring; 22, first interlocking part; 23, protection part;

[0039] 31, introduction sheath pipe; 311, conveying pipe part; 312, flat tube part; 313, second taper pipe; 32, first taper pipe; 33, limiting part. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0041] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless explicitly defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] In the prior art, if the inner diameter of the introduction sheath is too large, the spring ring will be prematurely detached from the conveying component during the process of conveying the spring ring to the guide catheter, so that the spring ring conveying device cannot continue to push, and the spring ring conveying device is scrapped; if the inner diameter of the introduction sheath is too small, the friction between the spring ring, the conveying component and the introduction sheath will be large, so that the spring ring is difficult to be pushed, and even the spring ring will be broken, therefore, it is urgent to provide a spring ring conveying device to solve the above technical problems.

[0044] As shown in Figure 1 and Figure 2 The spring ring conveying device provided by the embodiment includes a conveying unit 1, a spring ring unit 2 and an introduction sheath unit 3. The conveying unit 1 pushes the spring ring unit 2 to move in the introduction sheath unit 3, and passes through the introduction sheath unit 3 to enter the guide catheter. After the guide catheter guides the spring ring unit 2 to the target site, the spring ring unit 2 is separated from the conveying unit 1, and the spring ring unit 2 is implanted in the target site.

[0045] Specifically, the proximal end of the spring coil unit 2 is detachably connected with the distal end of the delivery unit 1, the introducing sheath unit 3 comprises an introducing sheath tube 31, the spring coil unit 2 and the delivery unit 1 are both arranged in the introducing sheath tube 31, the distal end of the introducing sheath tube 31 is provided with a first tapered tube 32, and the first tapered tube 32 gradually decreases in diameter from the proximal end to the distal end. The small end of the first tapered tube 32 is convenient to be connected with the guide catheter, the large end of the first tapered tube 32 is connected with the introducing sheath tube 31, and the introducing sheath tube 31 is arranged to be slightly larger in diameter, so as to reduce the friction between the spring coil unit 2 and the introducing sheath tube 31, and further to prevent the spring coil unit 2 from being deformed or broken during the pushing process; the distal end of the introducing sheath tube 31 is provided with the first tapered tube 32, which not only improves the adaptability of the introducing sheath tube 31 and the guide catheter, but also ensures that the delivery unit 1 and the spring coil unit 2 can be effectively connected during entering the guide catheter, so as to avoid the problem that the two units are separated in advance and cannot be pushed, and the spring coil delivery device is scrapped.

[0046] In the embodiment, the introducing sheath tube 31 gradually increases in diameter from the proximal end to the distal end, and the part with small diameter can limit the movement of the delivery unit 1 and the spring coil unit 2 to some extent, so as to prevent the delivery unit 1 and the spring coil unit 2 from moving unnecessarily in the introducing sheath tube 31 and causing the spring coil delivery device to fail. When the spring coil unit 2 is pushed, the delivery unit 1 and the spring coil unit 2 enter the part with large diameter of the introducing sheath tube 31, so as to reduce the friction between the spring coil unit 2 and the introducing sheath tube 31 during the delivery process, and further to prevent the spring coil unit 2 from being deformed or broken during the pushing process.

[0047] Further, the introducing sheath tube 31 comprises a delivery tube part 311 and a straight tube part 312, the diameter of the straight tube part 312 is smaller than that of the delivery tube part 311, and when the spring coil delivery device is not used, the delivery unit 1 and the spring coil unit 2 are arranged in the straight tube part 312, so as to limit the displacement of the delivery unit 1 and the spring coil unit 2. When the spring coil unit 2 is pushed, the spring coil unit 2 and the delivery unit 1 gradually enter the delivery tube part 311 with large diameter, so as to reduce the friction between the spring coil unit 2 and the introducing sheath tube 31 during the delivery process. In order to facilitate the connection between the straight tube part 312 and the delivery tube part 311, in the embodiment, the proximal end of the delivery tube part 311 is connected with the distal end of the straight tube part 312 through a second tapered tube 313. The distal end of the delivery tube part 311 is connected with the proximal end of the first tapered tube 32.

[0048] The straight tube part 312, the delivery tube part 311, the first tapered tube 32 and the second tapered tube 313 are usually made of high molecular materials, such as polyethylene, polypropylene and other polyolefin materials. Therefore, the end of the second tapered tube 313 is inserted into the straight tube part 312 (see Figure 3 , and the straight tube part 312 and the second tapered tube 313 are connected by heat melting, which is simple in connection mode and good in structural strength.

[0049] In order to ensure that the delivery device of the spring coil does not displace the spring coil unit 2 and the delivery unit 1 in the introduction sheath 31 when not in use, a limiting member 33 is arranged on the introduction sheath 31 in the embodiment to position the delivery unit 1 or the spring coil unit 2 in the introduction sheath 31. When the delivery device of the spring coil is in use, the limiting member 33 can be removed to release the displacement of the spring coil unit 2 and the delivery unit 1. Preferably, the limiting member 33 is arranged on the straight tube portion 312 of the introduction sheath 31.

[0050] Since the straight tube portion 312 is made of a polymer material and has a certain flexibility, the limiting member 33 includes a locking screw arranged on the straight tube portion 312, i.e. after the delivery device of the spring coil is assembled, the straight tube portion 312 is screwed to deform the inner diameter thereof and the inner wall of the straight tube portion 312 abuts against the delivery unit 1, thereby limiting the displacement of the delivery unit 1 and the spring coil unit 2. When the delivery device of the spring coil is in use, the straight tube portion 312 is unscrewed to move the inner wall of the straight tube portion 312 away from the delivery unit 1 to release the locking. In other embodiments, the limiting member 33 can also be a latch, a latch hole is arranged on the straight tube portion 312, and the latch is arranged in the latch hole to abut against the delivery unit 1. When the delivery device of the spring coil is in use, the latch is moved outward to separate the latch from the delivery unit 1.

[0051] The delivery unit 1 is used to push the spring coil unit 2 to move in the introduction sheath 31. Specifically, as shown in FIG. 2, in the embodiment, the delivery unit 1 includes a push rod 11, the distal end of the push rod 11 is connected with a flexible connecting assembly 12, and the distal end of the flexible connecting assembly 12 is detachably connected with the proximal end of the spring coil unit 2. Figure 4 The delivery unit 1 is designed in a segmented structure and has a flexible connecting portion, which has good adaptability to the relatively tortuous part in the peripheral blood vessel, good passability, and improved delivery performance of the delivery device of the spring coil.

[0052] The diameter of the push rod 11 gradually decreases from the proximal end to the distal end. The large diameter of the proximal end is to provide a certain support force when the spring coil unit 2 is pushed, and the diameter gradually decreases from the proximal end to the distal end to facilitate the movement of the push rod 11 in the introduction sheath 31 and reduce the friction between the push rod 11 and the introduction sheath 31.

[0053] In the embodiment, the length of the push rod 11 can be set to 600mm-2000mm, and the diameter of the push rod 11 is in the range of 0.5mm-2mm. Of course, the length and the diameter of the push rod 11 are not limited to the above-mentioned range, and can be set according to actual needs. The push rod 11 is made of biocompatible metal or alloy, specifically, made of stainless steel or nickel-titanium material, has certain flexibility, is not easy to deform, has strong recovery ability, and is convenient for the spring coil delivery device to deliver the spring coil unit 2 in the winding blood vessel part.

[0054] The flexible connection assembly 12 includes a heat shrink tube 121 and a delivery elastic member. One end of the heat shrink tube 121 is sleeved on the distal end of the push rod 11, the other end of the heat shrink tube 121 is connected with the proximal end of the delivery elastic member, and the spring coil unit 2 is detachably connected with the distal end of the delivery elastic member. The heat shrink tube 121 realizes the flexible connection between the delivery elastic member and the push rod 11. The heat shrink tube 121 is usually made of olefin materials such as polypropylene and polyethylene. Therefore, by locally heating the heat shrink tube 121 at a suitable temperature, the heat shrink tube 121 is deformed to be fixedly connected with the push rod 11 and the delivery elastic member. The connection of relatively precise parts is convenient, easy to operate, and low in cost.

[0055] The inner diameter of the heat shrink tube 121 matches the diameter of the push rod 11 and the size of the spring coil unit 2. In the embodiment, the inner diameter of the heat shrink tube 121 is generally 0.8mm-2.5mm. In order not to affect the delivery capacity of the delivery unit 1, to well adapt to the winding blood vessel part, and to ensure that the delivery unit 1 has certain structural strength, the wall thickness of the heat shrink tube 121 in the embodiment is selected to be 0.2mm-0.8mm.

[0056] In order to further improve the bending deformation capacity of the delivery unit 1, in the embodiment, the delivery elastic member includes a delivery spring 122 and a developing spring 123. The proximal end of the delivery spring 122 is connected with the heat shrink tube 121, and the proximal end of the developing spring 123 is connected with the distal end of the delivery spring 122, which further improves the ability of the delivery unit 1 to adapt to the winding blood vessel part. The delivery spring 122 and the developing spring 123 are connected by welding, and both are generally in a tubular structure. In the embodiment, the outer diameter of the delivery spring 122 is 1mm-2mm, and the length is 8mm-20mm. The delivery spring 122 is usually made of biocompatible metal or alloy, specifically made of stainless steel or nickel-titanium material, has certain flexibility, is not easy to deform, has strong recovery ability, and is convenient for the spring delivery device to deliver the spring coil unit 2 in the winding blood vessel part.

[0057] The developing spring 123 is coated with a developing agent to facilitate positioning of the spring coil unit 2 when the spring coil delivery device is used. In this embodiment, the developing spring 123 is made of biocompatible metal or alloy, specifically made of platinum-tungsten alloy.

[0058] The segmented arrangement of the delivery unit 1 in this embodiment also improves the adaptability of the spring delivery device to winding blood vessels, and has good passability.

[0059] During delivery, the spring coil unit 2 is disconnected from the delivery unit 1, and after the spring coil unit 2 is delivered to the target site, the spring coil unit 2 is separated from the delivery unit 1, and the spring coil unit 2 is implanted at the target site. In this embodiment, referring back to Figure 1 As shown, the spring coil unit 2 includes a spring coil 21, and the proximal end of the spring coil 21 is connected to a first interlocking member 22, and the distal end of the delivery unit 1 is provided with a second interlocking member 13 that can be engaged or separated with the first interlocking member 22.

[0060] Specifically, the second interlocking member 13 is connected to the distal end of the developing spring 123 of the delivery unit 1, and the second interlocking member 13 and the first interlocking member 22 each include an interlocking notch, and at least one interlocking protrusion adjacent to the interlocking notch of the second interlocking member 13 is inserted into the notch of the first interlocking member 22, and the interlocking protrusion adjacent to the interlocking notch of the first interlocking member 22 is inserted into the interlocking notch of the second interlocking member 13, thereby achieving the engagement connection of the spring coil unit 2 and the delivery unit 1, and the structure is simple.

[0061] Referring to Figure 5 As shown, the second interlocking member 13 includes a support rod that is inserted into the distal end of the developing spring 123 and fixedly connected to the developing spring 123 by welding, and the connection structure has high strength. The second interlocking member 13 is made of biocompatible metal or alloy, and specifically, the material of the second interlocking member 13 can be the same as that of the developing spring 123 to facilitate the fixed connection with the developing spring 123.

[0062] Referring to Figure 1 As shown, in this embodiment, the spring coil 21 to be delivered to the target tissue is provided with a fiber bundle, so that the spring coil 21 has less friction when released in the sheath tube 31 and the guide catheter, and can more easily and better transmit the pushing force in the axial direction of the spring coil 21 without the spring coil 21 piling up, thereby reducing the difficulty of surgical operation and the risk of aneurysm rupture. The first interlocking member 22 is fixedly connected to the spring coil 21 by welding or riveting. The spring coil 21 and the first interlocking member 22 are each made of biocompatible metal or alloy, and specifically, the spring coil 21 and the first interlocking member 22 can be made of stainless steel, titanium alloy or platinum alloy.

[0063] In the embodiment, the distal end of the spring coil 21 is provided with an end protection 23 to avoid damaging the aneurysm when the spring coil 21 is released.

[0064] The spring coil delivery device provided by the embodiment releases the spring coil 21 by mechanical release, and the release of the spring coil 21 can be achieved without external energy input, so that the production process and operation method of the spring coil delivery device are simplified, and the safety of the spring coil delivery device is improved. The spring coil delivery device is optimized from the aspects of production process, safety and effectiveness of the product, and has the advantages of simple structure, convenient operation and high safety.

[0065] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or possible to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A device for delivering a spring coil, characterized in that The application relates to a delivery device for a spring coil unit, comprising: a delivery unit (1); a spring coil unit (2), a proximal end of the spring coil unit (2) being detachably connected with a distal end of the delivery unit (1); a guide sheath unit (3) comprising a guide sheath tube (31), the spring coil unit (2) and the delivery unit (1) being arranged in the guide sheath tube (31), a distal end of the guide sheath tube (31) being provided with a first taper tube (32), and a tube diameter of the first taper tube (32) gradually decreasing from the proximal end to the distal end; the delivery unit (1) being used for pushing the spring coil unit (2) to move in the guide sheath tube (31); the tube diameter of the guide sheath tube (31) gradually increasing from the proximal end to the distal end; the guide sheath tube (31) comprising a delivery tube part (311) and a straight tube part (312), the tube diameter of the straight tube part (312) being smaller than that of the delivery tube part (311), a distal end of the delivery tube part (311) being connected with a proximal end of the first taper tube (32), and a proximal end of the delivery tube part (311) being connected with a distal end of the straight tube part (312) through a second taper tube (313).

2. The delivery device of claim 1, wherein, a limiting piece (33) being arranged on the guide sheath tube (31) and being capable of positioning the delivery unit (1) or the spring coil unit (2) in the guide sheath tube (31).

3. The delivery device of claim 1, wherein the spring coil is formed from a material selected from the group consisting of: stainless steel, titanium, and nickel-titanium alloy. the delivery unit (1) comprising: a push rod (11); a flexible connecting assembly (12), a proximal end of the flexible connecting assembly (12) being connected with a distal end of the push rod (11), and a distal end of the flexible connecting assembly (12) being detachably connected with a proximal end of the spring coil unit (2).

4. The delivery device of claim 3, wherein the spring coil is formed of a material selected from the group consisting of: stainless steel, titanium, and nickel titanium. the diameter of the push rod (11) gradually decreasing from the proximal end to the distal end.

5. The delivery device of claim 3, wherein the spring coil is formed of a material selected from the group consisting of: stainless steel, titanium, and nickel titanium. the flexible connecting assembly (12) comprising: a heat shrink tube (121), one end of the heat shrink tube (121) being sleeved with a distal end of the push rod (11); a delivery elastic member, a proximal end of the delivery elastic member being connected with the other end of the heat shrink tube (121), and a distal end of the delivery elastic member being detachably connected with the spring coil unit (2).

6. The delivery device of claim 5, wherein the spring coil is formed of a material selected from the group consisting of: stainless steel, titanium, and nickel titanium. the delivery elastic member comprising: a delivery spring (122), a proximal end of the delivery spring (122) being connected with the heat shrink tube (121); a developing spring (123), a proximal end of the developing spring (123) being connected with a distal end of the delivery spring (122), and the developing spring (123) being coated with a developing agent.

7. The delivery device of claim 1, wherein the coil is formed from a material selected from the group consisting of: stainless steel, titanium, and nickel-titanium alloys. the spring coil unit (2) comprising a spring coil (21), a proximal end of the spring coil (21) being connected with a first interlocking piece (22), and a distal end of the delivery unit (1) being provided with a second interlocking piece (13) capable of being engaged with or separated from the first interlocking piece (22).

8. The delivery device of claim 2, wherein the coil is formed from a material selected from the group consisting of: stainless steel, titanium, and nickel-titanium alloys. the limiting piece (33) being a locking screw thread arranged on the guide sheath tube (31).

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