A spring coil for blood flow blocking and its release system

Abstract

The present invention provides a spring coil for blood flow blocking and its release system, which relates to the field of medical device technology. The spring coil for blood flow blocking includes a spring coil body and a fiber line. The spring coil body is formed by winding a spring body formed by spiral processing of spring wire. The fiber line is at least partially located in the spring coil body, and at least one end extends out of the outer surface of the spring coil body; a first anti-untwisting wire and a second anti-untwisting wire arranged side by side are passed through the spring body. The present invention uses a double-strand anti-untwisting wire to prevent the spring coil from untwisting while using the double-strand anti-untwisting wire to perform preliminary fixation of the fiber line, which is a one-piece multi-purpose device. The fiber line is then wound and finally fixed by the spring wire, without the need to knot the fiber line, and the problem of the fiber line falling off and increasing the outer diameter of the spring body will not occur. In addition, both sides of the fiber line are located outside the spring body and are knotted, which can further improve the embolization effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a spring coil for blood flow blocking, and a spring coil release system for blood flow blocking having the spring coil. Background Art

[0002] During vascular occlusion therapy, coils and other implants need to be implanted into human blood vessels through a blood flow occlusion coil release system. In order to improve the efficiency of surgical treatment, existing technology ties fiber threads on the coils to improve the thrombus formation effect.

[0003] However, existing fiber tying methods typically clamp the fiber wires between adjacent spring wires using spring coils. This method provides poor fixation and can easily cause the fiber wires to fall off, leading to serious adverse events such as distal embolism. Another method involves tying the fiber wires into knots on the spring wires, which is difficult to operate and inefficient, and the exposed joints increase resistance to spring wire delivery. Furthermore, existing spring coil release mechanisms also present complex operation, low efficiency, and are prone to release failure. Summary of the Invention

[0004] The object of the present invention is to provide a blood flow blocking spring coil and a release system thereof, aiming to fully or partially solve the above technical problems.

[0005] To solve the above problems, the present invention first provides a spring coil for blood flow blocking, comprising a spring coil body and a fiber line, wherein the spring coil body is formed by winding a spring body formed by spiral processing of spring wire, and the fiber line is at least partially located in the spring coil body, and at least one end extends out of the outer surface of the spring coil body; along the length direction of the spring body, a first anti-untwisting wire and a second anti-untwisting wire arranged side by side are passed through the spring body, and the fiber line is tied to the first anti-untwisting wire and the second anti-untwisting wire in the following manner:

[0006] S1. Straighten the spring body before winding the spring body into the spring coil body, and stretch at least part of the spring body to a deformed state, whereby the spring wire of the spring body after stretching forms a plurality of first binding spaces;

[0007] S2. A first anti-untwisting wire and a second anti-untwisting wire having a length greater than that of the straightened spring body are passed through the channel formed by the spring body to ensure that the first anti-untwisting wire and the second anti-untwisting wire are parallel and fixed in the vertical direction. At this time, a second binding space is formed between the first anti-untwisting wire and the second anti-untwisting wire;

[0008] S3. Passing a double-strand closed-loop fiber line through the second binding space, and keeping the middle portion of the fiber line between the first anti-untwisting wire and the second anti-untwisting wire, wherein the fiber line has a first portion located on one side of the first anti-untwisting wire and the second anti-untwisting wire, and a second portion located on the other side of the first anti-untwisting wire and the second anti-untwisting wire;

[0009] S4. translating the first anti-untwisting wire or the second anti-untwisting wire so that the first anti-untwisting wire and the second anti-untwisting wire are aligned side by side and clamping the fiber line;

[0010] S5. One end of the first anti-untwisting wire and one end of the second anti-untwisting wire are fixedly connected to the fixed end of the spring body;

[0011] S6. Wrapping the first portion along a first circumferential direction around the first anti-untwisting wire and / or the second anti-untwisting wire, and wrapping the second portion along a second circumferential direction around the second anti-untwisting wire and / or the first anti-untwisting wire, wherein the first circumferential direction is the same as or opposite to the second circumferential direction;

[0012] S7. Release the stretching of the spring body, and the two adjacent turns of the spring wire clamp the first portion and the second portion;

[0013] S8. Cutting excess first anti-untwisting wire and second anti-untwisting wire, and fixedly connecting the other end of the first anti-untwisting wire and the other end of the second anti-untwisting wire.

[0014] By adopting the above technical solution, the double-strand anti-untwisting wire is used to prevent the spring coil from untwisting, and the double-strand anti-untwisting wire is used to initially fix the fiber line, which is multi-purpose. The fiber line is then wrapped and finally fixed by the spring wire. There is no need to knot the fiber line. Compared with the traditional binding method, it is not only easy to operate and has a good fixing effect, but also will not cause the fiber line to fall off or increase the outer diameter of the spring body. Moreover, both sides of the fiber line are located outside the spring body and are tied, which can further improve the embolization effect.

[0015] Furthermore, the step of tying the fiber thread to the first anti-untwisting yarn and the second anti-untwisting yarn further includes: S9. performing a bundle process on the first part and the second part to divide the first part and the second part into a plurality of fiber yarns.

[0016] By adopting the above technical solution, the first and second parts of the fiber line located outside the spring body on both sides are bundled to form multiple fiber filaments, thereby further improving the embolization effect.

[0017] Furthermore, the length of the first portion is greater than the length of the second portion. After the spring body is wound to form a spring coil, the first portion is located outside the spring coil, and the second portion is at least partially located inside the spring coil.

[0018] Using the above technical solution, the length of the first part is designed to be greater than the length of the second part to avoid interference between the two during winding, and the longer first part is placed outside the spring coil to achieve a good embolization effect, and the shorter second part is placed inside the spring coil, which can assist in embolism while reducing fiber waste.

[0019] Furthermore, a first clamping plane is provided on the side of the first anti-untwisting yarn facing the second anti-untwisting yarn, and a second clamping plane is provided on the side of the second anti-untwisting yarn facing the first anti-untwisting yarn, and the fiber line is clamped between the first clamping plane and the second clamping plane.

[0020] By adopting the above technical solution, the clamping force on the fiber line can be improved through the cooperation of the first clamping plane and the second clamping plane, thereby preventing the fiber line from escaping from the spring coil.

[0021] Furthermore, the first clamping plane and / or the second clamping plane are provided with friction particles.

[0022] By adopting the above technical solution, the friction particles are used to increase the friction between the first clamping plane and the second clamping plane and the fiber line, further improving the stability of the fiber line after it is fixed.

[0023] Furthermore, the fixed end head is provided with a first fixing hole, a second fixing hole and a third fixing hole on a side facing the first anti-untwisting wire and the second anti-untwisting wire, the first fixing hole and the second fixing hole are arranged at an interval, the third fixing hole is located between the first fixing hole and the second fixing hole, and is adjacent to the first fixing hole, and a card slot is provided between the third fixing hole and the second fixing hole; one end of the first anti-untwisting wire is inserted into the first fixing hole and fits tightly with the first fixing hole; along the direction away from the fixed end head, the second anti-untwisting wire comprises a first plug-in portion, a breaking body, a connecting belt and a second plug-in portion in sequence, one end of the first plug-in portion is configured to be plugged into and tightly fit with the second fixing hole, and the first plug-in portion The other end is connected to one end of the second plug-in part through the breaking body, and the breaking body is configured to be able to be disconnected from the first plug-in part and the second plug-in part under the action of external force. The length of the breaking body is equal to the length of the card slot and can be snapped into the card slot, and the connecting belt is respectively connected to the first plug-in part, the breaking body and the second plug-in part; wherein, the second anti-untwisting wire is connected to the fixed end head in the following manner: one end of the second anti-untwisting wire is inserted into the second fixing hole; the breaking body is broken so that one end of the breaking body is disconnected from the first plug-in part, and the other end of the breaking body is connected to the second plug-in part, and the breaking body is placed in the card slot; the second plug-in part is inserted into the third fixing hole.

[0024] By adopting the above technical solution, the first fixing hole and the second fixing hole are used to facilitate the initial fixation of the first anti-untwisting wire and the second anti-untwisting wire, which in turn facilitates the passage of the fiber line. Through the design of the breaking body and the connecting belt, the second anti-untwisting wire is easily translated to the third fixing hole for fixation, so that the first anti-untwisting wire and the second anti-untwisting wire are side by side to clamp the fiber line. The structure is ingenious and the operation is simple.

[0025] Furthermore, the connecting belt is made of the same material as the second anti-untwisting wire, and is hot-melt-connected to the first plug-in portion, the breaking body and the second plug-in portion.

[0026] The above technical solution can further improve the structural stability of the second anti-untwisting filament.

[0027] The present invention also provides a blood flow blocking spring coil release system, which includes a catheter mechanism, a conveying mechanism, a release mechanism, and a blood flow blocking spring coil as described in the above technical solution, at least part of the conveying mechanism, the release mechanism, and the blood flow blocking spring coil are located in the catheter mechanism, and the distal end of the conveying mechanism is connected to the blood flow blocking spring coil through the release mechanism; wherein, the release mechanism is configured to: operate the proximal end of the conveying mechanism to activate the release mechanism, and the blood flow blocking spring coil detaches from the conveying mechanism.

[0028] By adopting the above technical solution, the binding structure of the fiber line on the spring coil is improved. The fiber line is initially fixed by a double-strand anti-untwisting wire, and then the two sides of the fiber line are clamped and fixed by the elasticity of the spring body. There is no need to knot the fiber line. Compared with the traditional binding method, it is not only convenient to operate and has a good fixing effect, but also will not cause the problem of fiber line falling off and increasing the outer diameter of the spring body. Moreover, both sides of the fiber line are located outside the spring body and are tied, which can further improve the embolization effect.

[0029] Furthermore, the release mechanism includes a guide sleeve, a first release member and a second release member; the guide sleeve is installed in the catheter mechanism, and the outer diameter of the guide sleeve is smaller than the inner diameter of the catheter mechanism, the outer wall of the distal end of the guide sleeve is provided with a first limiting portion, and the inner wall of the distal end of the catheter mechanism is provided with a second limiting portion that can be limited and matched with the first limiting portion; the first release member and the second release member are slidably installed in the guide sleeve, one end of the first release member is connected to the conveying mechanism, the other end of the first release member is provided with a shape memory alloy part, and one end of the second release member is provided with a slot that is plugged into and matched with the shape memory alloy part, and a limiting groove is provided on the side wall of the slot, and the limiting groove has space for the shape memory alloy part to bend and deform, and the shape memory alloy part is configured to at least partially extend into the limiting groove at a first temperature and disengage from the limiting groove at a second temperature, and the first temperature is lower than the second temperature.

[0030] By adopting the above technical solution, medical staff do not need to break, pull the wire or perform other operations to release the coil. The coil can be automatically untwisted by simply placing it in the blood for a certain period of time, which reduces the workload of medical staff and improves the efficiency and accuracy of release.

[0031] Furthermore, the conveying mechanism includes a conveying tube connected to the releasing mechanism, and the conveying tube is provided with a spiral groove along its length direction. From the proximal end to the distal end of the conveying tube, the distance between two adjacent spiral grooves gradually decreases.

[0032] By adopting the above technical solution, the spiral groove is used to facilitate the curved delivery of the delivery tube, and the gradual pitch design is adopted to make the delivery tube gradually softer from the proximal end to the distal end, thereby enhancing the delivery performance and reducing the impact on the catheter tip. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of the spring body of the blood flow blocking spring coil provided in an embodiment of the present invention after being stretched;

[0035] Figure 2 A schematic diagram of the structure of a blood flow blocking spring coil provided in an embodiment of the present invention after being clamped by a first anti-untwisting wire and a second anti-untwisting wire;

[0036] Figure 3 A schematic diagram of the structure of a blood flow blocking spring coil provided in an embodiment of the present invention after the fiber thread is wound around the first anti-untwisting wire and the second anti-untwisting wire in a first state;

[0037] Figure 4 A schematic diagram of the structure of a blood flow blocking spring coil provided in an embodiment of the present invention after the fiber thread is wound around the first anti-untwisting wire and the second anti-untwisting wire;

[0038] Figure 5 A schematic diagram of the structure of the blood flow blocking spring coil provided in an embodiment of the present invention after the fiber thread is wound into the third state of the first anti-untwisting wire and the second anti-untwisting wire;

[0039] Figure 6 A schematic diagram of the structure of the spring body of the blood flow blocking spring coil provided in an embodiment of the present invention after the fiber line is implanted;

[0040] Figure 7 A schematic diagram of the structure of a blood flow blocking spring coil provided in an embodiment of the present invention after the spring coil is formed into a spring body;

[0041] Figure 8 A schematic structural diagram of a fixed end of a blood flow blocking spring coil and a second anti-untwisting wire provided in an embodiment of the present invention;

[0042] Figure 9 A schematic structural diagram of a blood flow occlusion coil release system provided in an embodiment of the present invention;

[0043] Figure 10A schematic structural diagram of a blood flow occlusion coil release system according to an embodiment of the present invention after the coil is released;

[0044] Figure 11 A schematic structural diagram of a delivery tube of a spring coil release system for blood flow occlusion provided in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 100 - spring coil body; 110 - spring body; 120 - fixed end; 121 - first fixing hole; 122 - second fixing hole; 123 - third fixing hole; 124 - slot;

[0047] 200-fiber line; 210-first part; 220-second part;

[0048] 300-first anti-untwisting yarn; 301-first clamping plane;

[0049] 400 - second anti-untwisting wire; 401 - second clamping plane; 410 - first plug-in portion; 420 - broken body; 430 - connecting belt; 440 - second plug-in portion;

[0050] 500-catheter mechanism; 510-second limiting portion;

[0051] 600- conveying mechanism; 610- spiral groove;

[0052] 700 - release mechanism; 710 - guide sleeve; 711 - first limiting portion; 720 - first release member; 721 - shape memory alloy portion; 730 - second release member; 731 - slot. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] In order to solve the problems of poor fixation effect in existing fiber fixation methods, which may easily cause serious distal embolism, or increase the outer diameter of the spring wire at the knotting point, thereby increasing the resistance to delivery, this embodiment first provides a spring coil for blood flow occlusion, aiming to solve the above technical problems by improving the structure of the spring coil and the fixation method of the fiber wire.

[0055] Combined with attachment Figure 6 and attached Figure 7As shown, the blood flow blocking spring coil of this embodiment includes a spring coil body 100 and a fiber line 200. The outer diameter of the distal end of the spring coil of this embodiment is designed to be 60% to 80% of the outer diameter of the proximal end, which facilitates the anchoring operation, makes the anchoring more firm, and is easier to fix and embolize in blood vessels with high blood flow rates. Specifically, the spring coil body 100 is formed by winding a spring body 110 formed by spiral processing of spring wire, that is, different from the traditional spring structure, this embodiment is to spirally wind the spring wire into a spring body 110, the spring body 110 has the same existing spring structure, and then the spring body 110 is wound by bending or other means to form a spring coil. The structure of the spring coil can be Figure 1 The spring body 110 may be a regular 3D spring shape or an irregular 2D shape (not shown in the figure). The structure diagram of the spring body 110 can be referred to Figure 2 It should be noted that the “distal end” and “proximal end” mentioned in this embodiment refer to the distance from the medical operator during the embolization operation.

[0056] The fiber line 200 of this embodiment is partially located in the spring coil body 100, and at least one end extends out of the outer surface of the spring coil body 100. In order to distinguish it from the existing fixing method of the fiber line 200, in the direction of winding the formed spring coil along the spring body 110, a first anti-untwisting wire 300 and a second anti-untwisting wire 400 are passed through the spring body 110 of this embodiment. One end of the first anti-untwisting wire 300 and the second anti-untwisting wire 400 are both connected to the fixed end 120 at the distal end of the spring coil body 100. The function of the first anti-untwisting wire 300 and the second anti-untwisting wire 400 is mainly to prevent the spring coil from being accidentally untwisted, and the spring coil can be recovered during operation by medical staff to avoid the distal end of the spring coil being stuck or the resistance increasing, resulting in an increase in the pitch and untwisting when the spring coil is recovered.

[0057] Different from the conventional binding method of the fiber line 200, the fiber line 200 of this embodiment is fixed to the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400 through the following steps:

[0058] S1. Straighten the spring body before winding it into the spring coil body 100 to form an attached Figure 1 The spring body is in a state in the middle, and at least part of the spring body is stretched to a deformed state, and the spring wire of the stretched spring body forms a plurality of first binding spaces; the stretching of the spring body in this step S1 can be achieved by a stretching device (not shown in the figure), and the stretching device has at least two first clamping mechanisms, and the two first clamping mechanisms can clamp and fix the two ends of the spring body, and the two first clamping mechanisms can move closer to or farther away from each other, thereby achieving stretching and fixing of the spring body and releasing the stretching and fixing.

[0059] S2. Insert the first anti-untwisting wire 300 and the second anti-untwisting wire 400, whose length is greater than the length of the spring body after being straightened, into the channel formed by the spring body to ensure that the first anti-untwisting wire 300 and the second anti-untwisting wire 400 are in a parallel and fixed state up and down. At this time, a second binding space is formed between the first anti-untwisting wire 300 and the second anti-untwisting wire 400; this step can be achieved by a movable clamping device (not shown in the figure).

[0060] S3. Pass the double-strand closed-loop fiber line 200 through the second binding space, and keep the middle part of the fiber line 200 between the first anti-unrotating wire 300 and the second anti-unrotating wire 400. At this time, the fiber line 200 has a first part 210 located on one side of the first anti-unrotating wire 300 and the second anti-unrotating wire 400, and a second part 220 located on the other side of the first anti-unrotating wire 300 and the second anti-unrotating wire 400.

[0061] S4. The first anti-unspinning yarn 300 or the second anti-unspinning yarn 400 is translated so that the first anti-unspinning yarn 300 and the second anti-unspinning yarn 400 are aligned side by side and the fiber line 200 is clamped to form an attachment. Figure 2 Status in.

[0062] S5. One end of the first anti-untwisting wire 300 and one end of the second anti-untwisting wire 400 are fixedly connected to the fixed end 120 of the spring body. The specific fixing connection method is given below.

[0063] S6. The first portion 210 is wound around the first anti-untwisting filament 300 and / or the second anti-untwisting filament 400 along a first circumferential direction, and the second portion 220 is wound around the second anti-untwisting filament 400 and / or the first anti-untwisting filament 300 along a second circumferential direction. The first circumferential direction and the second circumferential direction may be the same or opposite. The winding process may be performed by a micro-robotic arm.

[0064] There are many ways to wrap this step, such as Figure 3 As shown in FIG, the first part 210 is wound upward to the first anti-untwisting wire 300 of about half a circle, and the second part 220 is wound downward to the second anti-untwisting wire 400 of about half a circle. Of course, it can also be as shown in FIG. Figure 4 As shown, the first portion 210 is wound downwardly so as to wrap around the second anti-untwisting wire 400 for about half a circle, and the second portion 220 is wound upwardly so as to wrap around the first anti-untwisting wire 300 for about half a circle.

[0065] Of course, in order to improve the stability of the fiber line 200 after winding, it is also possible to Figure 5 As shown, the second anti-untwisting wire 400 is wound upwards and then wound downwards for about half a circle after the first portion 210 is wound upwards, the first anti-untwisting wire 300 is wound downwards and then wound upwards for about half a circle after the second portion 220 is wound downwards, and so on.

[0066] S7. Release the stretching of the spring body, and the two adjacent coils of spring wire clamp the first part 210 and the second part 220 to form Figure 6 Status in.

[0067] S8. Cut off the excess first anti-untwisting thread 300 and the second anti-untwisting thread 400, and fix the other end of the first anti-untwisting thread 300 and the other end of the second anti-untwisting thread 400 together.

[0068] The above-mentioned processing steps are adopted for the fiber filaments. The double-strand anti-untwisting wire is used to prevent the spring coil from untwisting, and the double-strand anti-untwisting wire is used to initially fix the fiber line 200, thereby realizing the multi-purpose use of the first anti-untwisting wire 300 and the second anti-untwisting wire 400. Then, the fiber line 200 is wound and finally fixed by the spring wire. There is no need to knot the fiber line 200. Compared with the traditional binding method, it is not only convenient to operate and has a good fixing effect, but also will not cause the fiber line 200 to fall off and increase the outer diameter of the spring body. Moreover, both sides of the fiber line 200 are located outside the spring body and are tied, which can further improve the embolization effect.

[0069] In addition, in order to further improve the embolization effect, the step of tying the fiber line 200 to the first anti-untwisting wire 300 and the second anti-untwisting wire 400 in this embodiment further includes: S9. The first part 210 and the second part 220 are subjected to a bundle process to divide the first part 210 and the second part 220 into multiple fiber filaments. The bundle-tying device (not shown in the figure) can include a plurality of micro-scrapers arranged side by side at intervals and a driving structure for driving the micro-scrapers. A single fiber line 200 can form multiple fiber filaments after bundled, and the number of fiber filaments is determined by the number of micro-scrapers and the number of operations.

[0070] Optionally, the fiber line 200 of this embodiment can be designed as a double-strand closed-loop structure. In this way, designing the fiber line 200 as a closed-loop double-strand structure can further increase the number of fiber filaments in the fiber line 200 after being bundled, further improving the embolization effect.

[0071] Optionally, in this embodiment, the length of the first portion 210 of the fiber filament is greater than the length of the second portion 220. After the spring body is wound to form a spring coil, the first portion 210 is located outside the spring coil, and the second portion 220 is at least partially located inside the spring coil. In this way, the length of the first portion 210 is designed to be greater than the length of the second portion 220, avoiding interference between the two when winding using a structure such as a micro-manipulator. In addition, placing the longer first portion 210 outside the spring coil achieves a good embolization effect, while placing the shorter second portion 220 inside the spring coil, which assists in embolization and reduces fiber waste.

[0072] In addition, in this embodiment, a first clamping plane 301 can be provided on the side of the first anti-untwisting wire 300 facing the second anti-untwisting wire 400, and a second clamping plane 401 can be provided on the side of the second anti-untwisting wire 400 facing the first anti-untwisting wire 300. The fiber line 200 is clamped between the first clamping plane 301 and the second clamping plane 401. The cooperation of the first clamping plane 301 and the second clamping plane 401 can increase the clamping force on the fiber line 200, thereby preventing the fiber line 200 from detaching from the spring coil.

[0073] Optionally, friction particles (not shown in the figure) can be provided on the first clamping plane 301 and the second clamping plane 401 of this embodiment. The friction particles are used to increase the friction between the first clamping plane 301 and the second clamping plane 401 and the fiber line 200, further improving the stability of the fiber line 200 after being fixed.

[0074] Combined with attachment Figure 8 As shown, in order to facilitate the relative fixation of the first anti-unrotating wire 300 and the second anti-unrotating wire 400 in step S2 to form a first binding space, and to facilitate the movement of one of the first anti-unrotating wire 300 and the second anti-unrotating wire 400 to form a fitting state, this embodiment also makes improvements to the structure of the fixed end 120, and a first fixing hole 121, a second fixing hole 122 and a third fixing hole 123 are provided on the side of the fixed end 120 facing the first anti-unrotating wire 300 and the second anti-unrotating wire 400, the first fixing hole 121 and the second fixing hole 122 are spaced apart, the third fixing hole 123 is located between the first fixing hole 121 and the second fixing hole 122, and is adjacent to the first fixing hole 121, and a card slot 124 is provided between the third fixing hole 123 and the second fixing hole 122.

[0075] One end of the first anti-untwisting wire 300 of this embodiment is inserted into the first fixing hole 121 and fits tightly with the first fixing hole 121; along the direction away from the fixed end head 120, the second anti-untwisting wire 400 includes a first plug-in portion 410, a breaking body 420, a connecting belt 430 and a second plug-in portion 440 in sequence. One end of the first plug-in portion 410 is configured to be able to be plugged into and tightly fit with the second fixing hole 122, and the other end of the first plug-in portion 410 is connected to one end of the second plug-in portion 440 through the breaking body 420. The breaking body 420 is configured to be able to be disconnected from the first plug-in portion 410 and the second plug-in portion 440 under the action of external force. The length of the breaking body 420 is equal to the length of the card slot 124 and can be snapped into the card slot 124. The connecting belt 430 is respectively connected to the first plug-in portion 410, the breaking body 420 and the second plug-in portion 440.

[0076] Among them, the second anti-untwisting wire 400 is connected to the fixed end 120 in the following manner: in step S2, one end of the second anti-untwisting wire 400 is inserted into the second fixing hole 122; in step S4, the breaking body 420 of this embodiment is broken, so that one end of the breaking body 420 is disconnected from the first plug-in part 410, and the other end of the breaking body 420 is connected to the second plug-in part 440, and the breaking body 420 is placed in the card slot 124; the second plug-in part 440 is inserted into the third fixing hole 123.

[0077] The above-mentioned structural design utilizes the first fixing hole 121 and the second fixing hole 122 to facilitate the initial fixation of the first anti-untwisting wire 300 and the second anti-untwisting wire 400, which in turn facilitates the passage of the fiber line 200. Through the design of the breaking body 420 and the connecting belt 430, it is convenient to translate the second anti-untwisting wire 400 to the third fixing hole 123 for fixation, so that the first anti-untwisting wire 300 and the second anti-untwisting wire 400 are side by side to clamp the fiber line 200. The structure is ingenious and the operation is simple.

[0078] Optionally, the connecting belt 430 of this embodiment is made of the same material as the second anti-untwisting wire 400, for example, both are alloy or polymer materials, and are hot-melt connected to the first plug-in part 410, the breaking body 420 and the second plug-in part 440 to further improve the structural stability of the second anti-untwisting wire 400.

[0079] Combined with attachment Figure 9 and attached Figure 10 As shown, based on the above-mentioned spring coil structure, the present invention also provides a blood flow occluding spring coil release system, which includes a catheter mechanism 500, a conveying mechanism 600, a releasing mechanism 700 and the above-mentioned blood flow occluding spring coil, wherein at least part of the conveying mechanism 600, the releasing mechanism 700 and the blood flow occluding spring coil are located in the catheter mechanism 500, and the distal end of the conveying mechanism 600 is connected to the blood flow occluding spring coil through the releasing mechanism 700; and the releasing mechanism 700 of this embodiment is configured as follows: when the proximal end of the conveying mechanism 600 is operated, the blood flow occluding spring coil is detached from the conveying mechanism 600.

[0080] The blood flow blocking spring coil release system of this embodiment improves the binding structure of the fiber line 200 on the spring coil. The fiber line 200 is initially fixed by a double-strand anti-untwisting wire, and then the two sides of the fiber line 200 are clamped and fixed by the elasticity of the spring body. There is no need to tie the fiber line 200. Compared with the traditional binding method, it is not only convenient to operate and has a good fixing effect, but also will not cause the fiber line 200 to fall off or increase the outer diameter of the spring body. Moreover, both sides of the fiber line 200 are located outside the spring body and are tied, which can further improve the embolization effect.

[0081] The release mechanism 700 of this embodiment has various structural forms. For example, the existing double "S" bend mechanical release structure (such structure is not shown in the figure) can be adopted, which is divided into an implant S bend and a delivery system S bend after integral cutting and molding. The implant S bend is connected to the spring coil, and the delivery system S bend is connected to the delivery mechanism 600. The implant S bend and the delivery system S bend are connected by inserting a release wire in the middle of the delivery mechanism 600; when the spring coil needs to be released, the proximal part of the delivery mechanism 600 is broken off, and then the release wire is stretched from the proximal end to separate the implant S bend from the delivery system S bend. The length of the release area is less than 2 mm, which reduces the impact on the catheter head end during delivery and avoids the kicking tube phenomenon after release; specifically, the proximal end of the release wire is connected to the release tube, and the release tube and the delivery system are point-welded; when release is required, the point welding point is broken, the release tube is pulled back, and the release wire moves back accordingly to achieve release; no handle, power supply or other accessories are required, which is simple and fast. In addition, the material selection and inner and outer diameter selection of the S-bend itself also reduce the hardness in this area; the short release area can further reduce the probability of release failure and improve stability.

[0082] The connection between the release wire and the release tube can be done in the following ways: A. Welding; insert the release wire into the release tube, and use the core shaft to stick the release wire to the wall, and perform laser welding on the outer surface of the release tube to connect the release wire and the release tube together; laser welding can be continuous welding or point welding to achieve connection strength; B. Crimping: insert the release wire into the release tube, and use a crimping tool or equipment to crimp the release tube to connect the release wire and the release tube together; crimping can be continuous or point-like to achieve connection strength; C. Bonding: insert the release wire into the release tube, and inject glue into the release tube to achieve connection.

[0083] The connection between the release tube and the conveying system can be point welding, such as 180 degree intervals (2 points), 120 degree intervals (3 points), and 90 degree intervals (4 points), to achieve a balance between connection strength and breaking force; that is, it can avoid accidental breakage and accidental release before use, and can also ensure that the breaking force required for breaking will not be too large, thereby meeting use requirements, reducing operation difficulty, and reducing operation time.

[0084] The inventors found that the existing release mechanism 700 generally has two release parts connected by a release line. The release line needs to pass through the delivery tube of the delivery mechanism 600, and a breaking line is provided on the delivery tube. When the spring coil needs to be released, the medical staff needs to manually break the breaking line of the delivery tube, and then pull the release line to release the interlocking connection between the two release parts. This method is not only cumbersome to operate, but also requires more structural improvements to the delivery tube of the delivery mechanism 600. In addition, in the process of pulling the release line, problems such as release failure, release line jamming, and breakage are prone to occur. Therefore, this embodiment also provides a new spring coil release mechanism 700.

[0085] Different from the existing release structure, the release mechanism 700 of this embodiment includes a guide sleeve 710, a first release member 720 and a second release member 730; the guide sleeve 710 is installed in the catheter mechanism 500, and the outer diameter of the guide sleeve 710 is smaller than the inner diameter of the catheter mechanism 500, the outer wall of the distal end of the guide sleeve 710 is provided with a first limiting portion 711, and the inner wall of the distal end of the catheter mechanism 500 is provided with a second limiting portion 510 that can be limited and matched with the first limiting portion 711; the first release member 720 and the second release member 730 are slidably installed in the guide sleeve 710, one end of the first release member 720 is connected to the conveying mechanism 600, the other end of the first release member 720 is provided with a shape memory alloy part 721, and one end of the second release member 730 is provided with a slot 731 that is plugged into the shape memory alloy part 721, and the side wall of the slot 731 is provided with a limiting groove, and the limiting groove has space for the shape memory alloy part 721 to bend and deform. Figure 9 As shown, the shape memory alloy portion 721 is configured to at least partially extend into the limiting groove at the first temperature. Figure 10 As shown, the shape memory alloy portion 721 is separated from the limiting groove at the second temperature, and the first temperature is lower than the second temperature, for example, the first temperature is 0-20°C and the second temperature is 30-40°C.

[0086] When releasing the spring coil, the release mechanism 700 of this embodiment does not require medical staff to break, pull the wire, or perform other operations to release the coil. The spring coil can be automatically untwisted by simply placing it in the blood for a certain period of time, which reduces the workload of medical staff and improves release efficiency and accuracy.

[0087] Combined with attachment Figure 11 As shown, the delivery mechanism 600 of this embodiment includes a delivery tube connected to the release mechanism 700. The delivery tube is provided with a spiral groove 610 along its length. From the proximal end to the distal end of the delivery tube, the distance between two adjacent spiral grooves 610 gradually decreases. The spiral grooves 610 are used to facilitate the curved delivery of the delivery tube, and the gradual spacing design is adopted to make the delivery tube gradually softer from the proximal end to the distal end, thereby enhancing the delivery performance and reducing the impact on the catheter tip.

[0088] Specifically, the conveying tube of the conveying mechanism 600 of this embodiment is cut in a far-end "spiral, intermittent, step-by-step gradual" manner, with a cutting width of 0.01mm-2mm, a spiral pitch of 0.1mm-10mm, and a step-by-step change. The intermittent ratio is 180° (cutting area): 45° (uncut area), and is gradually changed (Note: the intermittent ratio refers to, according to the defined cutting width and pitch, after cutting 180°, stop cutting 45°, cut 180° again, stop cutting 45°, and repeat this cycle;).

[0089] The above structural design has the following advantages: A. Gradual cutting to achieve a perfect combination of proximal support and distal flexibility; B. Gradually increasing pitch to achieve a smooth change in hardness and enhance the transmission of pushing force; C. Soft distal design to enhance delivery performance and reduce the impact on the catheter tip; D. Intermittent cutting to enhance anti-ovalization performance to avoid excessive cutting and softening of some areas. During use, ovalization squeezes the release wire, increases the resistance to release and pulling out, and may cause failure of the device such as inability to release.

[0090] In addition, the blood flow blocking coil release system of this embodiment is also provided with a marker ring (not shown in the figure). After the first coil is implanted, the visualization performance of the coil itself will block the visualization of the catheter tip; therefore, conventional coil catheters all have two marker rings with a spacing of 3 cm; therefore, the product needs to have a visualization mark 3 cm away from the coil, and when the mark is aligned with the proximal mark of the catheter, release begins; therefore, the assembly accuracy of the marker ring is very high; therefore, this embodiment has a new design for the marker ring, which is installed on the release wire and fixed to the required position by welding, swaging, bonding, etc. The marker ring can be a winding wire, a tube or a C-shaped tube; the traditional design places the marker on the outer surface of the delivery system, which increases the outer diameter and the delivery resistance on the one hand; on the other hand, there will be steps at both ends of the marker ring, which is easy to get stuck at the catheter tube seat, in tortuous blood vessels, etc.; the new design completely avoids this problem; and the traditional design needs to reduce the wall thickness of the marker ring to reduce the outer diameter, which increases the difficulty of connection; the new design of this embodiment fixes the marker ring on the release wire, which is simple and easy to operate. When release is required, the release wire is pulled proximally to release the implant; at this time, the marker ring on the release wire will move a certain distance proximally and deviate from the marker ring on the catheter, serving as an indicator, indicating that the implant has been released, making it convenient for the doctor to operate.

[0091] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to in conjunction with each other.

Claims

1. A spring coil for blood flow blocking, comprising a spring coil body (100) and a fiber line (200), wherein the spring coil body (100) is formed by winding a spring body (110) formed by spiral processing of spring wire, and the fiber line (200) is at least partially located in the spring coil body (100) and at least one end thereof extends out of the outer surface of the spring coil body (100); It is characterized by: A first anti-untwisting thread (300) and a second anti-untwisting thread (400) are provided in the spring body (110), and the fiber line (200) is tied to the first anti-untwisting thread (300) and the second anti-untwisting thread (400) in the following manner: S1. Straightening the spring body (110) before the spring body (110) is wound and formed into the spring coil body (100), and stretching at least a portion of the spring body (110) to a deformed state, so that the spring wire of the stretched spring body (110) forms a plurality of first binding spaces; S2. Inserting a first anti-untwisting wire (300) and a second anti-untwisting wire (400) having a length greater than the length of the spring body (110) after being straightened into the channel formed by the spring body (110), ensuring that the first anti-untwisting wire (300) and the second anti-untwisting wire (400) are in a vertically parallel and fixed state, and at this time, a second binding space is formed between the first anti-untwisting wire (300) and the second anti-untwisting wire (400); S3. Passing the double-strand closed-loop fiber line (200) through the second binding space, and keeping the middle of the fiber line (200) between the first anti-untwisting yarn (300) and the second anti-untwisting yarn (400), wherein the fiber line (200) has a first portion (210) located on one side of the first anti-untwisting yarn (300) and the second anti-untwisting yarn (400), and a second portion (220) located on the other side of the first anti-untwisting yarn (300) and the second anti-untwisting yarn (400); S4. translating the first anti-unspinning yarn (300) or the second anti-unspinning yarn (400) so that the first anti-unspinning yarn (300) and the second anti-unspinning yarn (400) are aligned side by side and the fiber line (200) is clamped; S5. fixedly connecting one end of the first anti-untwisting wire (300) and one end of the second anti-untwisting wire (400) to the fixed end (120) of the spring body (110); S6. The first portion (210) is laid and wound around the first anti-untwisting yarn (300) and / or the second anti-untwisting yarn (400) along a first circumferential direction, and the second portion (220) is laid and wound around the second anti-untwisting yarn (400) and / or the first anti-untwisting yarn (300) along a second circumferential direction, wherein the first circumferential direction is the same as or opposite to the second circumferential direction; S7. releasing the stretching of the spring body (110), so that the two adjacent turns of the spring wire clamp the first portion (210) and the second portion (220); S8. Cutting off the excess first anti-untwisting thread (300) and the second anti-untwisting thread (400), and fixedly connecting the other end of the first anti-untwisting thread (300) and the other end of the second anti-untwisting thread (400).

2. The blood flow blocking spring coil according to claim 1, characterized in that: The step of tying the fiber line (200) to the first anti-untwisting yarn (300) and the second anti-untwisting yarn (400) further comprises: S9. Perform a stranding process on the first part (210) and the second part (220), and divide the first part (210) and the second part (220) into a plurality of fiber filaments.

3. The blood flow blocking spring coil according to claim 1, characterized in that: The length of the first portion (210) is greater than the length of the second portion (220). After the spring body (110) is wound to form a spring coil body, the first portion (210) is located outside the spring coil body, and the second portion (220) is at least partially located inside the spring coil body.

4. The blood flow blocking spring coil according to claim 1, characterized in that: A first clamping plane (301) is provided on the side of the first anti-untwisting yarn (300) facing the second anti-untwisting yarn (400), and a second clamping plane (401) is provided on the side of the second anti-untwisting yarn (400) facing the first anti-untwisting yarn (300), and the fiber line (200) is clamped between the first clamping plane (301) and the second clamping plane (401).

5. The blood flow blocking spring coil according to claim 4, characterized in that: The first clamping plane (301) and / or the second clamping plane (401) are provided with friction particles.

6. The blood flow blocking spring coil according to claim 1, characterized in that: A first fixing hole (121), a second fixing hole (122) and a third fixing hole (123) are provided on a side of the fixing end (120) facing the first anti-untwisting thread (300) and the second anti-untwisting thread (400); the first fixing hole (121) and the second fixing hole (122) are spaced apart; the third fixing hole (123) is located between the first fixing hole (121) and the second fixing hole (122) and is adjacent to the first fixing hole (121); and a slot (124) is provided between the third fixing hole (123) and the second fixing hole (122); One end of the first anti-untwisting thread (300) is inserted into the first fixing hole (121) and tightly fits with the first fixing hole (121); Along the direction away from the fixed end (120), the second anti-untwisting wire (400) comprises a first plug-in portion (410), a breaking body (420), a connecting belt (430) and a second plug-in portion (440) in sequence, one end of the first plug-in portion (410) is configured to be plugged into and tightly fitted with the second fixing hole (122), the other end of the first plug-in portion (410) is connected to one end of the second plug-in portion (440) via the breaking body (420), the breaking body (420) is configured to be disconnected from the first plug-in portion (410) and the second plug-in portion (440) under the action of an external force, the length of the breaking body (420) is equal to the length of the card slot (124) and can be snapped into the card slot (124), and the connecting belt (430) is connected to the first plug-in portion (410), the breaking body (420) and the second plug-in portion (440) respectively; The second anti-untwisting wire (400) is connected to the fixed end (120) in the following manner: Inserting one end of the second anti-untwisting thread (400) into the second fixing hole (122); Breaking the breaking body (420) so that one end of the breaking body (420) is disconnected from the first plug-in portion (410), and the other end of the breaking body (420) is disconnected from the second plug-in portion (440), and placing the breaking body (420) in the slot (124); The second plug-in portion (440) is inserted into the third fixing hole (123).

7. The blood flow blocking spring coil according to claim 6, characterized in that: The connecting belt (430) is made of the same material as the second anti-untwisting wire (400), and is hot-melt-connected to the first plug-in portion (410), the breaking body (420), and the second plug-in portion (440).

8. A blood flow blocking coil release system, characterized in that: The invention comprises a catheter mechanism (500), a conveying mechanism (600), a releasing mechanism (700) and a blood flow blocking spring coil according to any one of claims 1 to 7, wherein at least part of the conveying mechanism (600), the releasing mechanism (700) and the blood flow blocking spring coil are located in the catheter mechanism (500), and the distal end of the conveying mechanism (600) is connected to the blood flow blocking spring coil via the releasing mechanism (700); wherein the releasing mechanism (700) is configured to: operate the proximal end of the conveying mechanism (600) so that the releasing mechanism (700) is actuated, and the blood flow blocking spring coil is separated from the conveying mechanism (600).

9. The blood flow blocking coil release system according to claim 8, characterized in that: The release mechanism (700) includes a guide sleeve (710), a first release member (720) and a second release member (730); the guide sleeve (710) is installed in the catheter mechanism (500), and the outer diameter of the guide sleeve (710) is smaller than the inner diameter of the catheter mechanism (500); the outer wall of the distal end of the guide sleeve (710) is provided with a first limiting portion (711), and the inner wall of the distal end of the catheter mechanism (500) is provided with a second limiting portion (510) capable of limiting and cooperating with the first limiting portion (711); the first release member (720) and the second release member (730) are slidably installed on the guide sleeve (710) ), one end of the first releasing member (720) is connected to the conveying mechanism (600), the other end of the first releasing member (720) is provided with a shape memory alloy part (721), and one end of the second releasing member (730) is provided with a slot (731) that is plugged into the shape memory alloy part (721), and a limiting groove is provided on the side wall of the slot (731), and the limiting groove has a space for the shape memory alloy part (721) to bend and deform, and the shape memory alloy part (721) is configured to at least partially extend into the limiting groove at a first temperature and detach from the limiting groove at a second temperature, and the first temperature is lower than the second temperature.

10. The blood flow blocking coil release system according to claim 8, characterized in that: The conveying mechanism (600) comprises a conveying tube connected to the releasing mechanism (700), wherein the conveying tube is provided with a spiral groove (610) along its length, and the distance between two adjacent spiral grooves (610) gradually decreases from the proximal end to the distal end of the conveying tube.

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