Mechanical release structure, manufacturing process thereof and spring ring system

Abstract

The invention discloses a mechanical release structure, a manufacturing process thereof and a spring ring system, and belongs to the technical field of medical instruments. The mechanical release structure is connected with the intracranial spring ring and the conveying assembly, the intracranial spring ring comprises a spring ring body and an anti-unwinding wire arranged in the spring ring body, and the conveying assembly comprises a conveying pipe and a release wire penetrating through the conveying pipe; the mechanical release structure comprises a fixed spring and a release ring, and the fixed spring is kept in the spring ring body; the releasing ring penetrates through the fixed spring and comprises a first section and a second section which extend out of the two ends of the fixed spring respectively, and the first section is arranged in the spring ring body and connected with the anti-unwinding thread; the second section and the end part of the fixed spring are enclosed to form an annular release area; the releasing wire penetrates through the annular releasing area and is detachably connected with the conveying pipe, so that the intracranial spring ring is kept at the far end of the conveying pipe. According to the mechanical release structure, the manufacturing process thereof and the spring ring system, the safety and reliability of surgical operation are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a mechanical release structure, its manufacturing process, and a spring coil system. Background Technology

[0002] Intracranial coils are commonly used implantable devices for interventional embolization of intracranial aneurysms. During treatment, the coils are inserted into the lesion within the aneurysm, packing it and blocking blood flow to prevent rupture. Coil release methods include electrical release, thermal release, hydrolysis, and mechanical release. Electrical and thermal release methods generally have long release times and require specialized release devices, making the procedure complex. Hydrolysis methods suffer from excessive preoperative preparation time, increasing the overall surgical duration. Mechanical release does not rely on specialized release devices and requires no preoperative preparation, making it simple and quick. However, mechanical release mechanisms often use a microcatheter to release the coil, which can exert additional pressure on the aneurysm wall during the release process, posing a risk of aneurysm rupture and resulting in lower safety and reliability. Summary of the Invention

[0003] The purpose of this invention is to provide a mechanical release structure, its manufacturing process, and a spring coil system to improve the safety and reliability of surgical procedures.

[0004] To achieve this objective, the present invention adopts the following technical solution: A mechanical release structure connects an intracranial coil and a delivery assembly. The intracranial coil includes a coil body and an anti-unwinding wire disposed within the coil body. The delivery assembly includes a delivery tube and a release wire passing through the delivery tube. The mechanical release structure includes: The spring is fixed and held within the spring coil body; The release ring passes through the fixed spring and includes a first section and a second section extending from both ends of the fixed spring. The first section is located within the spring coil body and is connected to the anti-unwinding wire. The second section and the end of the fixed spring enclose an annular release area. The release wire is threaded through the annular release area and detachably connected to the delivery tube, so that the intracranial spring coil is held at the distal end of the delivery tube.

[0005] In some embodiments, the first segment is provided with a first limiting ball, and the anti-unwinding wire passes through the first segment and is limited between the first limiting ball and the fixing spring.

[0006] In some embodiments, the first segment has an opening through which the anti-unwinding wire passes to be fitted onto the first segment.

[0007] In some embodiments, the first segment is further provided with a second limiting ball and a third limiting ball. The first limiting ball, the second limiting ball and the third limiting ball are arranged sequentially at intervals along the extension direction of the first segment. The third limiting ball abuts against the end of the fixed spring, and the opening is provided between the second limiting ball and the third limiting ball. The opening is located on one side of the first segment perpendicular to the axis of the fixed spring.

[0008] In some embodiments, the first segment is further provided with a fourth limiting ball, the fourth limiting ball abutting against the end of the fixed spring, and the opening is provided between the first limiting ball and the fourth limiting ball, the opening being located on one side of the first segment perpendicular to the axis of the fixed spring.

[0009] In some embodiments, the first segment is further provided with a fifth limiting ball, and the opening is provided between the first limiting ball and the fifth limiting ball. The opening is located on the side of the first segment away from the second segment along the axis of the fixed spring.

[0010] In some embodiments, the first segment is further provided with a sixth limiting ball, the sum of the diameters of the first limiting ball and the sixth limiting ball is equal to the inner diameter of the spring coil body, the first limiting ball and the sixth limiting ball form a limiting part, the anti-unwinding wire passes through the limiting part and is limited between the limiting part and the fixed spring.

[0011] In some embodiments, the length of the mechanical release structure along the axis of the fixed spring ranges from 0.6 mm to 1.2 mm.

[0012] A coil system includes an intracranial coil, a delivery assembly, and a mechanical release structure as described in any of the above embodiments. The intracranial coil includes a coil body and an anti-unwinding wire disposed within the coil body. The delivery assembly includes a delivery tube and a release wire passing through the delivery tube. The mechanical release structure includes a fixing spring and a first segment and a second segment disposed at both ends of the fixing spring. The second segment is bent and forms an annular release area with the end of the fixing spring. The fixing spring is held within the coil body. The first segment is disposed within the coil body and connected to the anti-unwinding wire. The release wire passes through the annular release area and is detachably connected to the delivery tube, so that the intracranial coil is held at the distal end of the delivery tube.

[0013] In some embodiments, the conveying assembly further includes a constraint spring, the side wall of the conveying tube has a communication port, the release wire includes a through section and an extension section, the through section passes through the annular release area and the communication port in sequence, the extension section is located outside the conveying tube, and the constraint spring is sleeved on the extension section and the conveying tube to bind and fix the extension section to the conveying tube.

[0014] A manufacturing process for a mechanical release structure as described in any of the above embodiments includes: A release ring is made from a platinum-tungsten wire with a diameter of 0.03 mm to 0.05 mm; A platinum-tungsten wire with a diameter of 0.03mm-0.05mm is wound into a fixed spring, the inner diameter of which is smaller than the outer diameter of the release ring, and the length is 0.2mm-0.6mm; The release ring is passed through the fixed spring, forming two ends that extend out of the first and second sections of the fixed spring, respectively. The length of the release ring along the axis of the fixed spring ranges from 0.6mm to 1.2mm. The first limiting ball is formed by welding in the first section.

[0015] The beneficial effects of this invention are: This invention provides a mechanical release structure, its manufacturing process, and a spring coil system. A fixed spring and a first section are located within the spring coil body. The first section is connected to an anti-unwinding wire. The fixed spring connects to the spring coil body, thus connecting the intracranial spring coil to the mechanical release structure. A release wire passes through the annular release area and is detachably connected to the delivery tube, thereby connecting the intracranial spring coil to the delivery assembly. When a force is applied to the release wire, the release wire is disconnected from the delivery tube and pulled out from the annular release area, thus integrating the intracranial spring coil with the mechanical release structure and detaching it from the delivery assembly. Because the release wire needs to pass through the annular release area before being detachably connected to the delivery tube, and when disengaging, the release wire is first disconnected from the delivery tube and then pulled out from the annular release area, the annular release area provides radial constraint and guidance for the movement of the release wire, and produces a certain damping and buffering effect on the axial movement of the release wire. This effectively reduces the impact of the release wire's movement, reduces the elastic force at the moment of separation between the release wire and the annular release area, and reduces the instantaneous impact load during separation. Thus, by optimizing the release action and force form, the risk of pressure on the tumor wall is reduced, and the safety and reliability of the surgical operation are improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first mechanical release structure provided in the embodiments of the present invention; Figure 2 This is a schematic diagram of the first type of spring coil system provided in the embodiments of the present invention; Figure 3 This is a schematic diagram of the second mechanical release structure provided in the embodiments of the present invention; Figure 4 This is a schematic diagram of a second type of spring coil system provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the third mechanical release structure provided in the embodiments of the present invention; Figure 6 This is a schematic diagram of a third type of spring coil system provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the fourth mechanical release structure provided in the embodiments of the present invention; Figure 8 This is a schematic diagram of the fourth type of spring coil system provided in the embodiments of the present invention; Figure 9 This is a schematic diagram of the fifth mechanical release structure provided in the embodiments of the present invention; Figure 10 This is a schematic diagram of the fifth type of spring coil system provided in the embodiments of the present invention; Figure 11 This is a flowchart of the manufacturing process of the mechanical release structure provided in the embodiments of the present invention.

[0017] In the picture: 100. Mechanical release structure; 110. Fixed spring; 120. Release ring; 121. First segment; 1211. First limiting ball; 1212. Opening; 1213. Second limiting ball; 1214. Third limiting ball; 1215. Fourth limiting ball; 1216. Fifth limiting ball; 1217. Sixth limiting ball; 122. Second segment; 200. Intracranial coil; 210. Coil body; 220. Anti-unwinding wire; 300. Conveying assembly; 310. Conveying pipe; 311. Connecting port; 320. Release wire; 321. Insertion section; 322. Extension section; 330. Restraint spring. Detailed Implementation

[0018] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] like Figures 1-10 As shown, this embodiment provides a mechanical release structure 100, which connects an intracranial coil 200 and a delivery assembly 300. The intracranial coil 200 includes a coil body 210 and an anti-unwinding wire 220 disposed within the coil body 210. The delivery assembly 300 includes a delivery tube 310 and a release wire 320 passing through the delivery tube 310. The mechanical release structure 100 includes a fixing spring 110 and a release ring 120. The fixing spring 110 is held within the coil body 210. The release ring 120 passes through the fixing spring 110 and includes a first segment 121 and a second segment 122 extending from both ends of the fixing spring 110. The first segment 121 is disposed within the coil body 210 and connected to the anti-unwinding wire 220. The second segment 122 and the end of the fixing spring 110 enclose an annular release area. The release wire 320 passes through the annular release area and is detachably connected to the delivery tube 310, so that the intracranial coil 200 is held at the distal end of the delivery tube 310.

[0022] Optionally, the release ring 120 is made of platinum-tungsten wire with a diameter of 0.03mm-0.05mm. It is a flat ring shape, narrow in the middle and wide at both ends. It includes a middle section and a first section 121 and a second section 122 connected to the two ends of the middle section. The width of the middle section is smaller than the width of the first section 121 and the second section 122. The middle section is inserted into the fixing spring 110. The first section 121 and the second section 122 are located at both ends of the fixing spring 110. Optionally, the second section 122 is semi-circular, and the corresponding inscribed circle diameter a is 0.05mm-0.07mm. The outer diameter of the second section 122 (i.e. the width of the second section 122) is 0.11mm-0.17mm.

[0023] The fixing spring 110 is made of platinum tungsten wire with a diameter of 0.03mm-0.05mm. The inner diameter of the fixing spring 110 is 0.06mm-0.15mm, and the length of the fixing spring 110 along its axis is 0.2mm-0.6mm. The inner diameter of the fixing spring 110 is smaller than the outer diameter of the second segment 122 to ensure that the second segment 122 will not detach from the fixing spring 110.

[0024] The fixing spring 110 and the first segment 121 are located inside the spring coil body 210. The first segment 121 is connected to the anti-unwinding wire 220, and the fixing spring 110 is connected to the spring coil body 210, thus connecting the intracranial spring coil 200 to the mechanical release structure 100. The release wire 320 passes through the annular release area and is detachably connected to the delivery tube 310, thereby connecting the intracranial spring coil 200 to the delivery assembly 300 through the mechanical release structure 100. When a force is applied to the release wire 320, the release wire 320 is disconnected from the delivery tube 310 and pulled out from the annular release area, thus connecting the intracranial spring coil 200 to the mechanical release structure 100 as a whole and detaching it from the delivery assembly 300. Since the release wire 320 needs to pass through the annular release area before being detachably connected to the delivery tube 310, and when disengaging, the release wire 320 first disconnects from the delivery tube 310 and then detaches from the annular release area, during this process, the annular release area forms a radial constraint and guide effect on the movement of the release wire 320, and produces a certain damping and buffering effect on the axial movement of the release wire 320, thereby effectively reducing the impact of the movement of the release wire 320, reducing the elastic force at the moment of separation between the release wire 320 and the annular release area, and reducing the instantaneous impact load during separation, the risk of pressure on the tumor wall is reduced by optimizing the release action and force form, thereby improving the safety and reliability of the surgical operation.

[0025] The release ring 120 passes through the fixed spring 110 and extends out of the fixed spring 110 at both ends, forming a semi-circular first segment 121 and a semi-circular second segment 122. The first segment 121 forms a ring structure with the fixed spring 110 for connection with the anti-unwinding wire 220; the second segment 122 forms an annular release area with the fixed spring 110 for detachable connection with the release wire 320.

[0026] Optionally, one end of the anti-unwinding wire 220 passes through the annular structure and is knotted to fix it, thereby connecting the anti-unwinding wire 220 to the first segment 121.

[0027] like Figure 1 and Figure 2 As shown, in some embodiments, the first segment 121 is provided with a first limiting ball 1211. The anti-unwinding wire 220 passes through the first segment 121 from either side of the first limiting ball 1211 and is fixed, and is confined between the first limiting ball 1211 and the fixing spring 110. Since the outer diameter of the first limiting ball 1211 is larger than that of the release ring 120, the protrusion formed on the release ring 120 plays the role of blocking the anti-unwinding wire 220, that is, restricting the anti-unwinding wire 220 from sliding in a part of the first segment 121 (the area between the first limiting ball 1211 and the fixing spring 110), thereby improving stability.

[0028] Optionally, the outer diameter of the first limiting ball 1211 is 0.12mm-0.16mm, so that the outer diameter of the first limiting ball 1211 is smaller than the inner diameter of the spring coil body 210, and the difference between the two is in the range of 0.02mm-0.04mm. This allows the first limiting ball 1211 to pass through and be located inside the spring coil body 210, and avoids the first limiting ball 1211 being too small, making it difficult to effectively prevent the slippage of the anti-unwinding wire 220.

[0029] Optionally, a portion of the length of the first segment 121 can be removed, and then laser welding can be used to form the first limiting ball 1211.

[0030] During intracranial aneurysm embolization using the intracranial coil 200, at the instant the intracranial coil 200 detaches from the tip of the delivery tube 310 and enters the aneurysm cavity, the recoil or thrust of the release of the intracranial coil 200 causes unexpected displacement or rebound of the tip of the delivery tube 310. Optionally, by cutting off a portion of the length of the first segment 121, the length of the mechanical release structure 100 along the axis of the fixed spring 110 ranges from 0.6mm to 1.2mm. Shortening the length of the mechanical release structure 100 and the second segment 122 reduces the annular release area, resulting in a smaller reaction force on the delivery tube 310 during release and a lower risk of tube kicking.

[0031] Optionally, the first segment 121 is provided with an opening 1212, through which the anti-unwinding wire 220 passes to be sleeved on the first segment 121, so as to facilitate the connection of the anti-unwinding wire 220.

[0032] Optionally, the opening 1212 is located on one side of the first segment 121 perpendicular to the axis of the fixed spring 110. The opening 1212 divides the first segment 121 into two parts, one of which is formed into a hook shape. The first limiting ball 1211 is located at the hook shape. The combination of the hook shape and the first limiting ball 1211 can effectively block the anti-unwinding wire 220 and further prevent the anti-unwinding wire 220 from slipping.

[0033] Optionally, the first segment 121 is also provided with another limiting ball, which abuts against the end of the fixed spring 110, and serves to limit the release ring 120 along the axis of the fixed spring 110, preventing the fixed spring 110 and the release ring 120 from slipping relative to each other; in addition, the fixed spring 110 and the limiting ball form a stop, so that the second segment 122 and the fixed spring 110 form a ring-shaped release area at the proximal end, thereby maintaining relative stability with the release wire 320 and preventing the release wire 320 from coming out.

[0034] like Figure 3 and Figure 4 As shown, in some embodiments, the first segment 121 is further provided with a second limiting ball 1213 and a third limiting ball 1214. The first limiting ball 1211, the second limiting ball 1213 and the third limiting ball 1214 are arranged sequentially at intervals along the extension direction of the first segment 121. An opening 1212 is provided between the second limiting ball 1213 and the third limiting ball 1214. The opening 1212 is located on the side of the first segment 121 perpendicular to the axis of the fixed spring 110. When the anti-unwinding wire 220 passes through the opening 1212, the second limiting ball 1213 and the third limiting ball 1214 have a guiding function. Furthermore, the third limiting ball 1214 abuts against the end of the fixed spring 110.

[0035] Optionally, one side of the first limiting ball 1211 is cut off, and the two ends of the cut are welded to form a second limiting ball 1213 and a third limiting ball 1214, respectively. The outer diameters of the second limiting ball 1213 and the third limiting ball 1214 are the same or different, with an outer diameter of 0.07mm-0.13mm, and the outer diameter is about 1 / 2-3 / 4 of the inner diameter of the fixed spring 110. When the opening 1212 is formed in the above manner, the head end of the cut-off point is cut off by a blade. The head end of the wire is relatively sharp and has burrs, which can easily scratch the anti-unwinding wire 220. The smooth structure of the second limiting ball 1213 and the third limiting ball 1214 effectively prevents the anti-unwinding wire 220 from being damaged during the process of passing through the opening 1212, and ensures the anti-unwinding strength of the intracranial spring coil 200.

[0036] like Figure 5 and Figure 6 As shown, in some embodiments, the first segment 121 is further provided with a fourth limiting ball 1215, which abuts against the end of the fixing spring 110. An opening 1212 is provided between the first limiting ball 1211 and the fourth limiting ball 1215, and the opening 1212 is located on the side of the first segment 121 perpendicular to the axis of the fixing spring 110. The first limiting ball 1211 is located at the hook-shaped end, and the anti-unwinding wire 220 passes through the opening 1212 and is knotted at the hook-shaped structure, and is limited between the first limiting ball 1211 and the fixing spring 110, which has the effect of preventing the anti-unwinding wire 220 from slipping off and preventing it from being damaged.

[0037] Optionally, a portion of the length of the first segment 121 is removed, and then laser welding is used to form a first limiting ball 1211 and a fourth limiting ball 1215. The outer diameter of the fourth limiting ball 1215 is 0.07mm-0.13mm, and its outer diameter is approximately 1 / 2-3 / 4 of the inner diameter of the fixed spring 110. When the opening 1212 is formed in the above manner, the cut-off end is in a state where it has been cut off by a blade. The wire end is relatively sharp and has burrs, which can easily scratch the anti-unwinding wire 220. The smooth structure of the first limiting ball 1211 and the fourth limiting ball 1215 effectively prevents the anti-unwinding wire 220 from passing through. To address the issue of damage during the opening process 1212, and to ensure the anti-unwinding strength of the intracranial spring coil 200, the first limiting ball 1211 serves as a limiting and blocking function. Compared to the first scheme described above, which involves forming a first limiting ball 1211, a second limiting ball 1213, and a third limiting ball 1214, this scheme uses a first limiting ball 1211 and a fourth limiting ball 1215. This reduces the number of welding limiting balls and the number of times the first segment 121 is cut off. In other words, the first segment 121 is cut off once, while the first limiting ball 1211 and the fourth limiting ball 1215 are welded simultaneously, simplifying the steps and making the process simpler.

[0038] like Figure 7 and Figure 8As shown, in some embodiments, the first segment 121 is further provided with a fifth limiting ball 1216, and an opening 1212 is provided between the first limiting ball 1211 and the fifth limiting ball 1216. The opening 1212 is located on the side of the first segment 121 away from the second segment 122 along the axis of the fixed spring 110. Optionally, a portion of the length of the first segment 121 is cut off from the end opposite to the second segment 122, and then laser welding is used to form a first limiting ball 1211 and a fifth limiting ball 1216. The outer diameters of the first limiting ball 1211 and the fifth limiting ball 1216 may be the same or different. Optionally, the outer diameters of the first limiting ball 1211 and the fifth limiting ball 1216 are both 0.07mm-0.13mm, and the outer diameter is approximately 1 / 2-3 / 4 of the inner diameter of the fixed spring 110. When the opening 1212 is formed in the above manner, the cut-off end is in the state of being cut off by a blade. The wire end is relatively sharp and has burrs, which can easily scratch the anti-unwinding wire 220. The smooth structure of the first limiting ball 1211 and the fifth limiting ball 1216 effectively prevents the anti-unwinding wire 220 from being damaged during the process of passing through the opening 1212, ensuring the anti-unwinding strength of the intracranial spring coil 200.

[0039] The first limiting ball 1211 is located at the end of the first segment 121 away from the second segment 122. The anti-unwinding wire 220 passes through the opening 1212 and is knotted in the area between the first limiting ball 1211 and the fixing spring 110. The length of this area is smaller than the length of the hook-shaped area, which restricts the anti-unwinding wire 220 to this area, further shortening the sliding distance of the anti-unwinding wire 220. The relative stability of the anti-unwinding wire 220 is better, and it has the effect of preventing the anti-unwinding wire 220 from slipping and being damaged.

[0040] Optionally, the outer surfaces of the first limiting ball 1211 and the fifth limiting ball 1216 are welded together to form the first segment 121 into a ring structure again. One end of the anti-unwinding wire 220 passes through the ring structure and is knotted and fixed, thereby connecting the anti-unwinding wire 220 to the first segment 121.

[0041] like Figure 9 and Figure 10As shown, in some embodiments, the first segment 121 is further provided with a sixth limiting ball 1217. The first limiting ball 1211 and the sixth limiting ball 1217 form a limiting part. The anti-unwinding wire 220 passes through the limiting part and is limited between the limiting part and the fixing spring 110. The anti-unwinding wire 220 passes through the limiting part and is knotted in the area between the limiting part and the fixing spring 110. The first limiting ball 1211 and the sixth limiting ball 1217 protrude from the first segment 121 and together form a limiting part, which plays a limiting and blocking role. The surfaces of the first limiting ball 1211 and the sixth limiting ball 1217 are smooth, which has the effect of preventing the anti-unwinding wire 220 from slipping off and preventing it from being damaged. Furthermore, the sum of the diameters of the first limiting ball 1211 and the sixth limiting ball 1217 is equal to the inner diameter of the spring coil body 210, that is, the outer surface of the limiting part abuts against the inner wall of the fixed spring 110 to prevent a gap from forming between the limiting part and the inner wall of the fixed spring 110, which would cause the anti-unwinding wire 220 to pass through the gap.

[0042] Optionally, a portion of the length of the first segment 121 is cut off from the end opposite to the second segment 122, and then laser welding is used to form a first limiting ball 1211 and a sixth limiting ball 1217, the outer diameters of the first limiting ball 1211 and the sixth limiting ball 1217 being the same or different.

[0043] Optionally, the fixing spring 110 passes through the spring coil body 210 and is welded thereon, thereby keeping the fixing spring 110 within the spring coil body 210. In other embodiments, the fixing spring 110 and the spring coil body 210 can also be connected by adhesive or snap-fit, ensuring that they are relatively fixed. Optionally, the release wire 320 uses a pull, rotate, and unlocking structure to disconnect from the delivery pipe 310, which can be referred to in the prior art and will not be described in detail here.

[0044] like Figures 1-10 As shown, this embodiment also provides a coil system, including an intracranial coil 200, a delivery assembly 300, and a mechanical release structure 100 as described above. The intracranial coil 200 includes a coil body 210 and an anti-unwinding wire 220 disposed within the coil body 210. The delivery assembly 300 includes a delivery tube 310 and a release wire 320 passing through the delivery tube 310. The mechanical release structure includes a fixing spring 110 and a first segment 121 and a second segment 122 disposed at both ends of the fixing spring 110. The second segment 122 is bent and forms an annular release area with the end of the fixing spring 110. The fixing spring 110 is held within the coil body 210. The first segment 121 is disposed within the coil body 210 and connected to the anti-unwinding wire 220. The release wire 320 passes through the annular release area and is detachably connected to the delivery tube 310, so that the intracranial coil 200 is held at the distal end of the delivery tube 310.

[0045] By employing the aforementioned mechanical release structure 100, one end is connected to the intracranial spring coil 200. Specifically, a fixing spring 110 and a first segment 121 pass through the spring coil body 210, an anti-unwinding wire 220 passes through the first segment 121 and is knotted for fixation, and the fixing spring 110 is welded to the spring coil body 210. The other end of the mechanical release structure 100 is detachably connected to the conveying assembly 300, such as... Figure 2 As shown, optionally, the annular release area or at least the second segment 122 passes through the delivery tube 310. The delivery assembly 300 also includes a constraint spring 330. The side wall of the delivery tube 310 has a connecting port 311. The release wire 320 includes a passing section 321 and a protruding section 322. The passing section 321 passes through the annular release area and the connecting port 311 in sequence. The protruding section 322 is located outside the delivery tube 310. The constraint spring 330 is sleeved on the protruding section 322 and the delivery tube 310, so that the protruding section 322 is bound and fixed to the delivery tube 310. That is, the distal end of the release wire 320 is fixed and limited by the constraint spring 330, so that the annular release area is bound by the release wire 320 of the delivery assembly 300, and the delivery assembly 300 is connected to the mechanical release structure 100. Thus, the mechanical release structure 100 effectively connects the delivery assembly 300 and the intracranial spring coil 200.

[0046] When the release wire 320 is pulled, it is disconnected from the delivery tube 310, i.e., pulled out from between the delivery tube 310 and the constraint spring 330, and detached from the annular release area. This disconnects the mechanical release structure 100 from the delivery assembly 300, allowing the intracranial spring coil 200 to be integrated with the mechanical release structure 100 and detached from the delivery assembly 300. The structural design of the release ring 120 allows for a pull-out release method using the release wire 320, reducing pressure on the aneurysm wall during surgery. Furthermore, the annular release area provides radial constraint and guidance for the movement of the release wire 320, reducing the elastic force at the moment of separation between the release wire 320 and the annular release area, thus reducing the risk of pressure on the aneurysm wall and improving the safety and reliability of the surgical procedure.

[0047] Specifically, the release wire 320 can be one of platinum-tungsten wire, stainless steel wire, or nickel-titanium wire, with a size of approximately 0.03mm-0.07mm. The distal end of the release wire 320 smoothly extends naturally as it passes through the annular release area and the connecting port 311. The outer portion 322 of the release wire 320 is limited by a constraint spring 330, effectively reducing pushing resistance and minimizing the risk of the distal end of the delivery tube 310 puncturing the aneurysm.

[0048] Optionally, the constraint spring 330 is made of stainless steel wire or platinum-tungsten wire with a diameter of 0.02mm-0.06mm, the inner diameter of the constraint spring 330 is 0.3mm-0.5mm, and the length of the constraint spring 330 along its axial direction is about 0.4mm-0.8mm, so that the bearing force of the constraint spring 330 is less than the preset release force; when the release force, that is, the pulling force applied to the release wire 320, is greater than the bearing force of the constraint spring 330, the release wire 320 can be pulled out from between the delivery pipe 310 and the constraint spring 330.

[0049] like Figure 11 As shown, this embodiment also provides a manufacturing process for the above-mentioned mechanical release structure 100, including: Step S100: A release ring 120 is made from a platinum-tungsten wire with a diameter of 0.03mm-0.05mm; specifically, the inner diameter of the release ring 120 is 0.05mm-0.07mm and the outer diameter is 0.17mm-0.19mm.

[0050] Step S200: A platinum-tungsten wire with a diameter of 0.03mm-0.05mm is wound into a fixed spring 110. The inner diameter of the fixed spring 110 is smaller than the outer diameter of the release ring 120, and the length of the fixed spring 110 along its axial direction is 0.2mm-0.6mm. Specifically, the inner diameter of the fixed spring 110 is 0.06mm-0.15mm. Setting the inner diameter of the fixed spring 110 to be smaller than the outer diameter of the release ring 120 ensures that the release ring 120 and the fixed spring 110 will not separate. Optionally, after the fixed spring 110 is wound, its initial length is greater than the preset length. Then, 4 to 10 times the diameter multiple of the platinum-tungsten wire are cut into the fixed spring 110, with a length of approximately 0.2mm-0.6mm.

[0051] Step S300: Pass the release ring 120 through the fixed spring 110 to form a first segment 121 and a second segment 122 that extend out of the fixed spring 110 at both ends. The length of the release ring 120 along the axis of the fixed spring 110 is in the range of 0.6mm-1.2mm. In step S400, a first limiting ball 1211 is formed by welding in the first segment 121. Specifically, the outer diameter of the first limiting ball 1211 is 0.12mm-0.16mm, and the gap between it and the spring coil body 210 is about 0.02mm-0.04mm.

[0052] By forming a release ring 120 and a fixing spring 110 respectively, and then connecting the two, the connection is ensured by limiting the inner diameter of the fixing spring 110 and the outer diameter of the release ring 120. Finally, a first limiting ball 1211 is welded to the first segment 121 to form a mechanical release structure 100. The manufacturing methods of the release ring 120 and the fixing spring 110, the connection method of the two, and the forming method of the first limiting ball 1211 are all conventional operations with few process steps, thus making the mechanical release structure 100 easy to manufacture.

[0053] Optionally, step 300 further includes: truncating a portion of the length of the first segment 121; In step S400, the two cut ends are joined together and welded to form the first limiting ball 1211. The length of the release ring 120 along the axis of the fixed spring 110 ranges from 0.6mm to 1.2mm.

[0054] Optionally, after step S400, the method further includes: Step S500: Cut off one section of platinum-tungsten wire on both sides of the first limiting ball 1211 with a blade, and then weld it into a ball using a welding machine to form the second limiting ball 1213 and the third limiting ball 1214. The diameter of each ball is 0.07mm-0.13mm, which is about 1 / 2-3 / 4 of the inner diameter of the fixed spring 110.

[0055] Specifically, depending on actual needs, further cutting and welding can be performed on the first segment 121 to form structures such as the fourth limiting ball 1215, the fifth limiting ball 1216, and the sixth limiting ball 1217, which will not be described in detail here.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mechanical release structure, characterized in that, A connection is made between an intracranial coil (200) and a delivery assembly (300). The intracranial coil (200) includes a coil body (210) and an anti-unwinding wire (220) disposed within the coil body (210). The delivery assembly (300) includes a delivery tube (310) and a release wire (320) passing through the delivery tube (310). The mechanical release structure includes: The fixed spring (110) is held within the spring coil body (210); The release ring (120) passes through the fixed spring (110) and includes a first section (121) and a second section (122) extending from both ends of the fixed spring (110). The first section (121) is located inside the spring coil body (210) and is connected to the anti-unwinding wire (220). The second section (122) and the end of the fixed spring (110) enclose an annular release area. The release wire (320) is inserted through the annular release area and is detachably connected to the delivery tube (310), so that the intracranial spring coil (200) is held at the distal end of the delivery tube (310).

2. The mechanical release structure according to claim 1, characterized in that, The first segment (121) is provided with a first limiting ball (1211), and the anti-unwinding wire (220) passes through the first segment (121) and is limited between the first limiting ball (1211) and the fixing spring (110).

3. The mechanical release structure according to claim 2, characterized in that, The first segment (121) has an opening (1212), through which the anti-unwinding wire (220) passes to be fitted onto the first segment (121).

4. The mechanical release structure according to claim 3, characterized in that, The first segment (121) is further provided with a second limiting ball (1213) and a third limiting ball (1214). The first limiting ball (1211), the second limiting ball (1213) and the third limiting ball (1214) are arranged in sequence at intervals along the extension direction of the first segment (121). The third limiting ball (1214) abuts against the end of the fixed spring (110), and the second limiting ball (1213) and the third limiting ball (1214) are provided with the opening (1212). The opening (1212) is located on one side of the first segment (121) perpendicular to the axis of the fixed spring (110).

5. The mechanical release structure according to claim 3, characterized in that, The first segment (121) is also provided with a fourth limiting ball (1215), which abuts against the end of the fixed spring (110). The opening (1212) is provided between the first limiting ball (1211) and the fourth limiting ball (1215), and the opening (1212) is located on the side of the first segment (121) perpendicular to the axis of the fixed spring (110).

6. The mechanical release structure according to claim 3, characterized in that, The first segment (121) is also provided with a fifth limiting ball (1216), and the opening (1212) is provided between the first limiting ball (1211) and the fifth limiting ball (1216). The opening (1212) is located on the side of the first segment (121) away from the second segment (122) along the axis of the fixed spring (110).

7. The mechanical release structure according to claim 2, characterized in that, The first segment (121) is also provided with a sixth limiting ball (1217). The sum of the diameters of the first limiting ball (1211) and the sixth limiting ball (1217) is equal to the inner diameter of the spring coil body (210). The first limiting ball (1211) and the sixth limiting ball (1217) form a limiting part. The anti-unwinding wire (220) passes through the limiting part and is limited between the limiting part and the fixed spring (110).

8. The mechanical release structure according to claim 1, characterized in that, The length of the mechanical release structure along the axis of the fixed spring (110) ranges from 0.6 mm to 1.2 mm.

9. A spring coil system, characterized in that, The device includes an intracranial coil (200), a delivery assembly (300), and a mechanical release structure as described in any one of claims 1-8. The intracranial coil (200) comprises a coil body (210) and an anti-unwinding wire (220) disposed within the coil body (210). The delivery assembly (300) comprises a delivery tube (310) and a release wire (320) passing through the delivery tube (310). The mechanical release structure comprises a fixing spring (110) and a first segment (121) and a second segment (121) disposed at both ends of the fixing spring (110). The first segment (122) is bent and surrounds the end of the fixed spring (110) to form an annular release area; the fixed spring (110) is held inside the spring coil body (210); the first segment (121) is located inside the spring coil body (210) and is connected to the anti-unwinding wire (220); the release wire (320) passes through the annular release area and is detachably connected to the delivery tube (310) so that the intracranial spring coil (200) is held at the distal end of the delivery tube (310).

10. The spring coil system according to claim 9, characterized in that, The conveying assembly (300) further includes a constraint spring (330). The side wall of the conveying tube (310) is provided with a connecting port (311). The release wire (320) includes a passing section (321) and a protruding section (322). The passing section (321) passes through the annular release area and the connecting port (311) in sequence. The protruding section (322) is located outside the conveying tube (310). The constraint spring (330) is sleeved on the protruding section (322) and the conveying tube (310) to bind and fix the protruding section (322) to the conveying tube (310).

11. A manufacturing process for a mechanical release structure as described in any one of claims 1-8, characterized in that, include: A release ring (120) is made from a platinum-tungsten wire with a diameter of 0.03 mm to 0.05 mm; A platinum-tungsten wire with a diameter of 0.03mm-0.05mm is wound into a fixed spring (110), the inner diameter of which is smaller than the outer diameter of the release ring (120), and the length is 0.2mm-0.6mm; The release ring (120) is passed through the fixed spring (110) to form a first section (121) and a second section (122) extending out of the fixed spring (110) at both ends, respectively. The length of the release ring (120) along the axis of the fixed spring (110) is in the range of 0.6mm-1.2mm. The first limiting ball (1211) is formed by welding in the first segment (121).

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