A multi-stage de-coiling spring ring de-coiling device

Abstract

The application provides a multi-section coil releasing device, belonging to the technical field of interventional instruments. The device comprises a filling assembly, a push tube and a connecting assembly. The filling assembly has a plurality of spring coils which are sequentially and detachably connected end to end. The push tube is connected to the distal end of the filling assembly and can be pushed to a target position. The connecting assembly has a buckling structure and a locking structure. The buckling structure comprises at least interlocking members arranged at the two ends of the spring coil. Any two adjacent spring coils are buckled to each other through the interlocking members. The distal end of the locking structure is used to axially pass through the interlocking members to achieve the locking of the spring coil. The proximal end is accommodated in the lumen of the push tube. When the filling assembly is released, the locking structure is pulled towards the proximal end, thereby releasing the locking of the buckling structure at the end of the spring coil to release the spring coil. The device is mainly used to solve the problem of insufficient structural stability of the mechanical release scheme in the prior art, and the problem of accidental separation or clamping failure of the buckle.

Description

Technical Field

[0001] This invention belongs to the field of interventional device technology, specifically relating to a multi-segment release coil release device. Background Technology

[0002] In the field of interventional surgery, coils are currently the most widely used embolization device in clinical practice. Their working principle is as follows: when a coil is delivered to the target vessel, it remains within a segment of the vessel with a diameter similar to its own, mechanically blocking local blood flow. Simultaneously, thrombus formation often occurs around the embolus and distal to the embolized vessel, further enhancing the blood flow interruption effect. Therefore, this device is often used for the embolization treatment of small arteries or arteriovenous fistulas. The method of releasing the coils directly affects the efficiency and safety of the surgery, and determines whether the coils can be accurately separated at the target location, reducing the risk of displacement. Currently available coil release techniques are mainly divided into mechanical release and electrical release. For example, Chinese invention patent CN106725697B discloses a multi-point electrolytic release system for releasing embolized materials. This system consists of two parts: a "spring coil body" and a "delivery system." The spring coil body adopts a structure of "multiple small spring coils connected end-to-end," with independent release points between adjacent small spring coils. The delivery system includes a delivery guidewire placed inside a microcatheter. The guidewire's tip connects to the end of the spring coil through the last release point. Simultaneously, an energized wire is embedded in the microcatheter's tip, and microwires are embedded in the catheter wall, forming a circuit with the energized wire. When the aneurysm embolization effect reaches the clinical expectation, the nearest release point can be selected for electrolytic release. However, this technology relies on the principle of electrolytic release, which not only results in a long release process but is also affected by factors such as the intravascular electrolyte environment and current stability, leading to uncertainty in the release effect and limiting its applicability.

[0003] Chinese utility model patent CN218528814U discloses an embolization spring coil assembly, whose structure includes a delivery tube and a spring coil: the spring coil is at least partially located inside the delivery tube and can move freely along the axial direction of the delivery tube; the spring coil is composed of two or more segmented spring coils, and a locking device is provided at the joint of adjacent segmented spring coils. This device includes a first latch and a second latch that are mutually adapted. During surgical operation, by pushing the spring coil along the delivery tube, the locking device will cooperate with the inner wall of the delivery tube, and the connection and release of adjacent segmented spring coils can be achieved by the locking and releasing action of the latches. The locking structure of this technology has insufficient stability, and in complex vascular anatomy structures (such as tortuous vessels and bifurcated vessels), the latches are prone to accidental separation or locking failure. In summary, existing release spring coil technologies have two major technical problems: First, although the electrical release scheme can achieve multi-point release, the release time is long and the stability is poor, making it difficult to cope with scenarios with high time requirements, such as emergency surgery; second, existing mechanical release schemes rely on simple snap-fit ​​structures, which are prone to problems such as accidental separation of the snap-fit ​​or snap-fit ​​failure.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-segment release spring coil release device to solve the problems of long release time and poor stability of existing electric release schemes, and insufficient structural stability and easy occurrence of accidental separation or failure of the buckle in existing mechanical release schemes.

[0006] To achieve the above objectives, the multi-segment release spring coil release device of the present invention provides the following technical solution: A multi-stage release spring coil release device, comprising: A filling assembly having a plurality of spring coils that are detachably connected end-to-end in sequence; A push tube, the distal end of which is connected to a filling component, is used to push the push tube to a target position; A connecting assembly having a fastening structure and a locking structure, wherein the fastening structure includes at least interlocking members for being disposed at both ends of the spring coils, wherein any two adjacent spring coils are fastened together by the interlocking members at opposite ends, and the distal end of the locking structure is used to axially pass through the cooperating interlocking members simultaneously to lock any two adjacent spring coils, and the proximal end is housed within the cavity of the push tube. When the filling component is released, the locking structure is pulled towards the proximal end, causing the locking structure to disengage from the interlocking parts, thereby releasing the lock on the end of the spring coil and releasing the spring coil.

[0007] As a further optimized technical solution, the interlocking component has a connecting seat, a snap-fit ​​groove, and a snap-fit ​​block arranged sequentially along the axial direction. The connecting seat is used to fix the end of the spring coil, the snap-fit ​​groove is used to place the snap-fit ​​block of the adjacent interlocking component, and the snap-fit ​​block is used to snap into the snap-fit ​​groove of the adjacent interlocking component.

[0008] As a further optimized technical solution, at least the end of the interlocking member located at the distal end of the spring coil has a guide section.

[0009] As a further optimized technical solution, the interlocking component is arranged coaxially with the spring coil.

[0010] As a further optimized technical solution, the interlocking component is provided with a through hole along the axial direction for the locking structure to pass through, and the through hole is arranged coaxially with the spring ring.

[0011] As a further optimized technical solution, the push tube is provided with multiple limiting members spaced apart along the axial direction. The size of the limiting members gradually decreases from the proximal end to the distal end. The locking structure is provided with multiple stop blocks spaced apart along the axial direction, which cooperate sequentially with the limiting members. The size of the stop blocks gradually increases from the proximal end to the distal end, so that the limiting member at the distal end limits the stop block at the distal end. The distance between any two adjacent stop blocks is the same as the length of the corresponding released spring coil.

[0012] As a further optimized technical solution, the distance between any two adjacent limiting members is less than the distance between the corresponding two stop blocks.

[0013] As a further optimized technical solution, each of the limiting members is a symmetrical structure, and the stop block is a column structure arranged coaxially with the push tube.

[0014] As a further optimized technical solution, a separation structure for disconnecting the connection is provided between any two of the limiting members.

[0015] As a further optimized technical solution, the separate structure is an annular groove formed in the push tube.

[0016] Beneficial effects: This invention adopts a purely mechanical release method. Through the cooperation of the snap-fit ​​structure and the locking structure, the snap-fit ​​structure enables the spring coils to snap together, and the locking structure ensures the stability of the snap-fit. This structure can still ensure the stability of the spring coil connection in the complex environment of blood vessels. It can effectively avoid the accidental separation of the spring coils due to the snap-fit ​​failure during the pushing process. The spring coils can be released by pulling the locking structure later. It does not rely on current or intravascular electrolyte environment. The release response time is short, which can meet the time requirements of emergency surgery. That is, the release efficiency is high and the stability is strong. Furthermore, the limiting component inside the push tube cooperates with the stop block on the locking structure, and the distance between adjacent stop blocks is consistent with the length of the spring coil. This enables precise control of the pulling distance of the locking structure, ensuring that only a preset number of spring coils are released each time, thus avoiding the problems of releasing too many or incompletely releasing the spring coils.

[0017] Furthermore, the separate structure can be designed to flexibly and accurately release individual coils or release multiple coils simultaneously, depending on the specific release requirements during the surgical procedure. This can be achieved by disconnecting the separate structure one by one or at intervals, thus meeting different surgical needs.

[0018] Furthermore, the coaxial design of the interlocking components and spring coils, the coaxial cooperation of the perforation and locking structure, and the symmetrical structure of the limiting components and stop blocks all ensure that the device is subjected to uniform force during use, avoid malfunctions caused by structural eccentricity or excessive gaps, extend the service life of the device, and reduce surgical risks. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the overall structure of one embodiment of the multi-segment release spring coil release device of the present invention; Figure 2 This is a schematic diagram of the push tube structure of one embodiment of the multi-segment release spring coil release device of the present invention; Figure 3 This is a cross-sectional schematic diagram of the push tube portion of one embodiment of the multi-segment release spring coil release device of the present invention; Figure 4 This is a schematic diagram of the spring coil structure of one embodiment of the multi-segment release spring coil release device of the present invention; Figure 5 This is a schematic diagram of the release process of one embodiment of the multi-segment release spring coil release device of the present invention.

[0020] In the diagram: 100, filling component; 101, spring ring; 200, push tube; 210, annular groove; 300, snap-fit ​​structure; 301, interlocking component; 3011, connecting seat; 3012, snap-fit ​​groove; 3013, snap-fit ​​block; 3014, guide section; 400, locking structure; 500, limiting component; 600, stop block. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0022] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0025] This invention provides a multi-segment release spring coil release device, mainly used to solve the problems of long release time and poor stability in existing electric release schemes, and insufficient structural stability and difficulty in accurately controlling the release position and timing in existing mechanical release schemes. The device includes a filling assembly 100, a pushing tube 200, and a connecting assembly. The filling assembly 100 has multiple spring coils 101 that are detachably connected end-to-end. The pushing tube 200 is connected to the filling assembly 100 at its distal end and is used to push the filling assembly 100 to the target position. The connecting assembly has a fastening structure 300 and a locking structure 400. The fastening structure 300 consists of interlocking members 301 at both ends of the spring coils 101, allowing adjacent spring coils 101 to be fastened together through the interlocking members 301. The locking structure 400 axially passes through the interlocking members 301 simultaneously to lock adjacent spring coils 101. During release, the locking structure 400 is pulled towards the proximal end to disengage it from the interlocking members 301, thus releasing the spring coils 101. Furthermore, the limiting element 500 within the pushing tube 200 cooperates with the stop block 600 on the locking structure 400 to precisely control the number of releases. This device offers high release efficiency, strong stability, and precise controllable position and timing, making it suitable for vascular embolization interventional procedures.

[0026] Example 1 like Figure 1 As shown, the multi-segment release spring coil release device includes a filling assembly 100, a pushing tube 200, and a connecting assembly.

[0027] The filling component 100 has a plurality of spring coils 101 that are detachably connected end to end in sequence. The number of spring coils 101 can be flexibly combined according to the target blood vessel embolization requirements to meet the embolization treatment needs of blood vessel segments of different lengths. In this embodiment, for ease of understanding of the technical solution, the filling component is described as having two spring coils 101.

[0028] like Figure 2 As shown, the push tube 200 is made of flexible medical tubing. To increase the flexibility of the push tube 200, a spiral groove extending along the axial direction is provided on the outer side of the push tube 200, so that it can better adapt to the curvature of the blood vessel. The distal end is connected to the filling component 100, which can stably push the filling component 100 to the target blood vessel position (target position) during interventional procedures.

[0029] The connecting assembly has a snap-fit ​​structure 300 and a locking structure 400. The snap-fit ​​structure 300 includes at least interlocking elements 301 disposed at both ends of the spring coil 101. Figure 4 As shown, in this embodiment, the interlocking component 301 has a connecting seat 3011, a snap-fit ​​groove 3012, and a snap-fit ​​block 3013 arranged sequentially along the axial direction. The connecting seat 3011 is used to fix the end of the spring coil 101 by bonding, welding, or mechanical locking to ensure connection strength and prevent it from falling off during use. The snap-fit ​​groove 3012 is used to place the snap-fit ​​block 3013 of the adjacent interlocking component 301. The snap-fit ​​block 3013 is used to snap into the snap-fit ​​groove 3012 of the adjacent interlocking component 301. The snap-fit ​​groove 3012 and the snap-fit ​​block 3013 have complementary cylindrical shapes. This structural design can effectively limit the axial displacement of the adjacent interlocking components 301 and further improve the stability after locking. The locking structure 400 is a release wire made of medical metal material (e.g., nickel-titanium alloy). The distal end is used to pass through the interlocking components 301 axially at the same time to lock any two adjacent spring coils 101. The proximal end is housed in the cavity of the push tube 200. That is, any two adjacent spring coils 101 are engaged with each other by the interlocking parts 301 at their opposite ends, the locking structure 400 is used to pass through the engaged interlocking parts 301 at the same time to ensure the stability of the connection.

[0030] In this embodiment, the interlocking member 301 is not only used at the end of the spring coil 101, but also at the distal end of the push tube 200. The filling assembly 100 and the push tube 200 are also detachably connected through the connection of the connecting assembly.

[0031] When the filling component 100 is released, the locking structure 400 is pulled proximally, and the locking structure 400 disengages from the interlocking parts 301, thereby releasing the lock on the end fastening structure 300 of the spring coil 101. At this time, the fastening relationship between adjacent spring coils 101 is unrestrained. Under the impact of blood flow in the blood vessel or the slight retraction of the push tube 200, one or more spring coils 101 can be accurately released. The release process does not rely on current or complex environmental conditions, and can be completed by mechanical pulling operation only. The release response time is short and the stability is not affected by the intravascular environment.

[0032] Furthermore, at least the end of the interlocking member 301 located at the distal end of the spring coil 101 has a guide section 3014. The guide section 3014 has a conical or frustum-shaped structure, and its outer diameter gradually decreases from the proximal end to the distal end. During the delivery of the filling component 100 to the target blood vessel through the microcatheter, the guide section 3014 can reduce the frictional resistance with the inner wall of the microcatheter, while avoiding jamming at blood vessel bifurcation or stenosis, ensuring that the filling component 100 can smoothly reach the target position. In addition, it also facilitates the cooperation between the interlocking member 301 and adjacent interlocking members 301.

[0033] Furthermore, the interlocking component 301 and the spring coil 101 are arranged coaxially. This coaxial design ensures that the filling component 100 is subjected to uniform force during the pushing process, avoids the spring coil 101 from twisting or shifting due to eccentricity, and at the same time ensures that the locking structure 400 can accurately pass through the interlocking component 301 along the axial direction, thereby improving the reliability of locking and unlocking operations.

[0034] Furthermore, the interlocking component 301 is provided with a through hole along the axial direction for the locking structure 400 to pass through, and the through hole is arranged coaxially with the spring ring 101. The inner diameter of the through hole matches the outer diameter of the locking structure 400, which ensures that the locking structure 400 can pass smoothly through the through hole, and also avoids loosening of the connection due to excessive gap in the locked state. Furthermore, by coaxially arranging the spring coil 101 with the perforation on the interlocking member 301, the spring coil 101 can be arranged coaxially in the locked state. In this way, compared with the spring coil 101 that cannot be locked coaxially, the present invention can effectively reduce the radial dimension of the filling component 100, thereby reducing the space occupied by the vascular vessel during delivery. On the one hand, this can be adapted to finer target vessels, expanding the clinical application range of the device; on the other hand, when delivered in a vessel of the same diameter, the gap between the filling component 100 and the vessel wall is larger, which can reduce the frictional contact between the filling component 100 and the vascular endothelium, reduce the risk of vascular wall damage and endothelial detachment, and at the same time reserve more channels for blood flow, avoiding temporary vascular blockage caused by excessive space occupied by the filling component 100 during delivery. This is especially suitable for embolization scenarios of narrow vessels that are sensitive to blood flow blockage, such as intracranial vessels and coronary arteries.

[0035] Meanwhile, the coaxial design also improves the push compliance of the filling component 100: when the filling component 100 passes through a curved blood vessel segment, the coaxially arranged spring coils 101 can deform synchronously along the bending direction of the blood vessel, avoiding local stress concentration caused by non-coaxial arrangement (such as in existing non-coaxial solutions, large bending stress is easily generated at the misalignment of adjacent spring coils, which may lead to deformation of the spring coils or loosening of the interlocking structure); and the locking structure 400 is distributed along the axis, which can uniformly transmit the pushing force, avoiding the filling component 100 from getting stuck or shifting in the curved blood vessel due to force deviation, ensuring that the filling component 100 can smoothly reach the target position along the preset path.

[0036] like Figure 3 As shown, the push tube 200 has multiple limiting members 500 spaced apart along the axial direction. The size of the limiting members 500 gradually decreases from the proximal end to the distal end. The locking structure 400 has multiple stop blocks 600 spaced apart along the axial direction, which cooperate sequentially with the limiting members 500. The size of the stop blocks 600 gradually increases from the proximal end to the distal end, so that the farthest limiting member 500 limits the farthest stop block 600. The distance between any two adjacent stop blocks 600 is the same as the length of the corresponding released spring coil 101. The design of the limiting component 500 and the stop block 600 allows for precise control of the pulling distance of the locking structure 400: when the operator pulls the locking structure 400 towards the near end, each stop block 600 will sequentially contact and be limited by the corresponding limiting component 500. At this time, the pulling distance of the locking structure 400 corresponds exactly to the release requirement of one spring coil 101, ensuring that each pulling operation can only release a preset number of spring coils 101, avoiding excessive release due to over-pulling or incomplete release due to under-pulling, and ensuring the accuracy of release.

[0037] In this embodiment, to ensure the compactness of the product structure, the distance between any two adjacent limiting members 500 is less than the distance between the corresponding two stop blocks 600. This design minimizes the arrangement space of the limiting members 500 within the push tube 200 while ensuring the limiting function, and allows the limiting members 500 to be concentrated at the proximal end of the push tube 200, facilitating surgical operations.

[0038] In this embodiment, each limiting member 500 is a symmetrical annular structure, and the stop block 600 is a cylindrical structure coaxially arranged with the push tube 200. The symmetrical structure ensures that the limiting force of the limiting member 500 on the stop block 600 is evenly distributed, avoiding tilting or jamming of the stop block 600 due to uneven force. The stop block 600 is a cylindrical structure coaxially arranged with the push tube 200, and the outer peripheral surface of the cylindrical structure is smooth, which can reduce the frictional resistance with the inner wall of the push tube 200 and ensure that the stop block 600 can move smoothly along the axial direction of the push tube 200.

[0039] Furthermore, a separation structure for disconnecting the connection is provided between any two limiting members 500. When it is necessary to release the spring coil 101, the separation structure can be broken by external force. At this time, the corresponding limiting member 500 loses connection, and the locking structure 400 can be pulled to a preset position to release the spring coil 101, thereby improving the flexibility of surgical operation. In this embodiment, the separation structure is an annular groove 210 formed in the push tube 200. The depth of the annular groove 210 is about 1 / 2 to 2 / 3 of the wall thickness of the push tube 200. This depth design ensures that the push tube 200 at the annular groove 210 maintains structural integrity during normal push operation. When it is necessary to disconnect, only a slight torsional or bending force needs to be applied to the push tube 200 externally to break the annular groove 210. The operation is simple and controllable.

[0040] In specific usage, such as Figure 5 As shown, first place the fill component 100 at the target location, such as... Figure 5 As shown in (a), at this time, the spring coil 101 in the filling assembly 100 is in the locked state, and then the release wire is pulled, as shown in (a). Figure 5 As shown in (b), after the proximal limiting member 500 contacts the proximal stop block 600 on the release wire, the stop block 600 is stopped by the proximal limiting member 500. At this time, the release wire retracts from the distal spring coil 101, and the interlocking member 301 of the distal spring coil 101 separates from the interlocking member 301 of the proximal spring coil 101, causing the distal spring coil 101 to fall off. Figure 5 As shown in (c), if you want to continue separating the proximal spring coil 101, you can break the annular groove 210 between the two limiting members 500 of the blocking block, and then continue to pull the release wire until the distal stop block 600 is blocked by the distal limiting member 500. At this time, the release wire is withdrawn into the push tube 200, the interlocking member 301 between the proximal spring coil 101 and the push tube 200 is separated, and the proximal spring coil 101 falls off.

[0041] In other embodiments, the number of limiting members 500, stop blocks 600 and annular grooves 210 can be increased according to specific needs to achieve more controllable release of segments.

[0042] In summary, the multi-segment release coil release device provided by this invention, through its designed double-connection structure of snapping and locking, systematically solves the technical problems of low release efficiency and poor stability in existing electro-release schemes, as well as the structural redundancy and insufficient operational controllability of traditional mechanical release schemes. This device allows for flexible matching of component specifications according to target vessel parameters before surgery; during surgery, it ensures smooth delivery of the filling component by relying on the guide segment; and it achieves rapid release of single or multiple coil segments through tension control and real-time limit feedback. Postoperatively, it allows for safe recovery of remaining components and reduces the risk of vascular injury. The entire process balances ease of operation, clinical safety, and treatment precision. It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the protection scope of the present invention.

Claims

1. A multi-stage release spring coil release device, characterized in that, include: A filling assembly (100) having a plurality of spring coils (101) that are detachably connected end to end in sequence. A push tube (200), the far end of which is connected to a filling component (100), is used to push the push tube (200) to a target position; A connecting assembly having a snap-fit ​​structure (300) and a locking structure (400), the snap-fit ​​structure (300) including at least interlocking members (301) for being disposed at both ends of a spring coil (101), any two adjacent spring coils (101) being snapped together by the interlocking members (301) at opposite ends, the distal end of the locking structure (400) being used to axially pass through the cooperating interlocking members (301) simultaneously to lock any two adjacent spring coils (101), and the proximal end being housed in the cavity of a push tube (200); When the filling component (100) is released, the locking structure (400) is pulled towards the proximal end, and the locking structure (400) disengages from the interlocking parts (301) to release the lock on the end fastening structure (300) of the spring coil (101) and release the spring coil (101). The push tube (200) is provided with a plurality of limiting members (500) spaced apart along the axial direction. The size of the limiting members (500) gradually decreases from the proximal end to the distal end. The locking structure (400) is provided with a plurality of stop blocks (600) spaced apart along the axial direction, which cooperate sequentially with the limiting members (500). The size of the stop blocks (600) gradually increases from the proximal end to the distal end, so that the limiting member (500) at the farthest end limits the stop block (600) at the farthest end. The distance between any two adjacent stop blocks (600) is the same as the length of the corresponding released spring coil (101). The distance between any two adjacent limiting members (500) is less than the distance between the corresponding two stop blocks (600).

2. The multi-segment release spring coil release device according to claim 1, characterized in that, The interlocking component (301) has a connecting seat (3011), a snap-fit ​​groove (3012) and a snap-fit ​​block (3013) arranged sequentially along the axial direction. The connecting seat (3011) is used to fix the end of the spring coil (101). The snap-fit ​​groove (3012) is used to place the snap-fit ​​block (3013) of the adjacent interlocking component (301). The snap-fit ​​block (3013) is used to snap into the snap-fit ​​groove (3012) of the adjacent interlocking component (301).

3. The multi-segment release spring coil release device according to claim 1, characterized in that, The end of the interlocking member (301) located at least at the distal end of the spring coil (101) has a guide section (3014).

4. The multi-segment release spring coil release device according to claim 1, characterized in that, The interlocking component (301) is arranged coaxially with the spring ring (101).

5. The multi-segment release spring coil release device according to claim 4, characterized in that, The interlocking member (301) has a through hole along the axial direction for the locking structure (400) to pass through, and the through hole is arranged coaxially with the spring ring (101).

6. The multi-segment release spring coil release device according to claim 1, characterized in that, Each of the limiting members (500) is a symmetrical structure, and the stop block (600) is a column structure coaxially arranged with the push tube (200).

7. The multi-segment release spring coil release device according to claim 1, characterized in that, A separation structure for disconnecting the connection is provided between any two of the limiting members (500).

8. The multi-segment release spring coil release device according to claim 7, characterized in that, The separate structure is an annular groove (210) formed in the push tube (200).

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