CN115869031A - Spring ring for blocking blood flow and release system thereof - Google Patents

Abstract

The invention provides a spring ring for blocking blood flow and a release system thereof, relating to the technical field of medical instruments. The blood flow blocking spring ring comprises a spring ring body and a fiber wire, wherein the spring ring body is formed by winding a spring body which is formed by spirally processing a spring wire, at least part of the fiber wire is positioned in the spring ring body, and at least one end of the fiber wire extends out of the outer surface of the spring ring body; the spring body is internally provided with a first anti-unscrewing wire and a second anti-unscrewing wire which are attached side by side in a penetrating manner. The double-strand anti-unwinding wire is used for preventing the spring ring from unwinding, the double-strand anti-unwinding wire is used for primarily fixing the fiber wire, the double-strand anti-unwinding wire is multifunctional, the fiber wire is wound and finally fixed through the spring wire, knotting of the fiber wire is not needed, the problems that the fiber wire falls off and the outer diameter of the spring body is increased are solved, the two sides of the fiber wire are located outside the spring body and are subjected to lock treatment, and the embolism effect can be further improved.

Description

A spring coil for blocking blood flow and its release system

technical field

The invention relates to the technical field of medical devices, in particular to a spring coil for blocking blood flow, and a spring coil release system for blocking blood flow with the spring coil.

Background technique

In the process of vascular occlusion therapy, implants such as coils need to be implanted in human blood vessels through a coil release system for blood flow occlusion. In order to improve the efficiency of surgical treatment, fiber threads are bound on the coils in the prior art , thereby improving the thrombus effect.

However, the existing fiber binding method generally clamps the fiber thread through the gap between the adjacent spring wires of the spring coil. This method has poor fixing effect, and it is easy to cause the fiber thread to fall off and cause serious distal embolism and other adverse events; another method Knotting and fixing the fiber thread on the spring wire is difficult and inefficient, and the exposure of the overlapping points increases the resistance of the spring wire. In addition, the existing spring coil release structure also has problems such as cumbersome operation, low efficiency, and even prone to release failure.

Contents of the invention

The object of the present invention is to provide a spring coil for blocking blood flow and its release system, aiming to solve the above technical problems in whole or in part.

In order to solve the above problems, the present invention firstly provides a spring coil for blocking blood flow, which includes a coil body and a fiber thread. The fiber thread is at least partly located in the spring coil body, and at least one end protrudes from the outer surface of the spring coil body; along the length direction of the spring body, the spring body is pierced with first anti-decomposition joints arranged side by side. spinning and the second anti-untwisting yarn, the fiber thread is bound to the first anti-untwisting yarn and the second anti-untwisting yarn in the following manner:

S1. Before the spring body is wound into the coil body, the spring body is straightened, and at least part of the spring body is stretched to a deformed state, and the spring wire of the stretched spring body is formed into multiple a first binding space;

S2. The first anti-untwisting wire and the second anti-untwisting wire whose length is longer than the straightened length of the 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 The secondary anti-untwisting filament is in a vertically parallel and fixed state, at this time, a second binding space is formed between the first anti-untwisting filament and the second anti-untwisting filament;

S3. Pass the double-strand closed-loop fiber thread through the second binding space, and keep the middle part of the fiber thread between the first anti-untwisting yarn and the second anti-untwisting yarn, at this time The fiber thread has a first portion located on one side of the first anti-untwisting yarn and the second anti-untwisting yarn, and on the other side of the first anti-untwisting yarn and the second anti-untwisting yarn. the second part of the side;

S4. Translate the first anti-untwisting yarn or the second anti-untwisting yarn so that the first anti-untwisting yarn and the second anti-untwisting yarn fit side by side, and clamp the fiber thread ;

S5. Fixedly connecting one end of the first anti-untwisting wire and one end of the second anti-untwisting wire to the fixed end of the spring body;

S6. Winding the first part on the first anti-untwisting wire and/or the second anti-untwisting wire along the first circumferential direction, and winding the second part on the first anti-untwisting wire along the second circumferential direction The second anti-untwisting thread and/or the first anti-untwisting thread, the first circumferential direction is the same as or opposite to the second circumferential direction;

S7. Release the stretching of the spring body, and two adjacent coils of the spring wire clamp the first part and the second part;

S8. Cutting the redundant first anti-untwisting yarn and the second anti-untwisting yarn, and fixedly connecting the other end of the first anti-untwisting yarn to the other end of the second anti-untwisting yarn.

Using the above technical scheme, the double-strand anti-untwisting wire is used to prevent the untwisting of the spring coil, and at the same time, the double-strand anti-twisting wire is used to initially fix the fiber thread, which is multi-purpose, and then the fiber thread is wound and passed through the spring wire For final fixation, there is no need to knot the fiber thread. Compared with the traditional binding method, it is not only convenient to operate, but also has a better fixing effect, and there will be no problems of fiber thread falling off and increasing the outer diameter of the spring. The spring outside the body and treated with a beating can also further improve the embolization effect.

Further, the step of binding the fiber thread to the first anti-untwisting yarn and the second anti-untwisting yarn further includes: S9. performing a beating treatment on the first part and the second part, Both the first portion and the second portion are divided into a plurality of filaments.

By adopting the above technical solution, the first part and the second part located outside the spring body on both sides of the fiber thread are subjected to beating treatment to form a plurality of fiber threads, further improving the embolism effect.

Further, the length of the first part is greater than the length of the second part. After the spring body is wound into a coil, the first part is located outside the coil, and the second part is at least partially located on the coil. inside the spring coil.

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 mutual interference between the two when winding, and the longer first part is placed outside the spring coil to achieve a good embolism effect, and the shorter part The second part is placed in the spring coil, which can reduce the waste of fiber filaments while assisting embolization.

Further, the side of the first anti-untwisting wire facing the second anti-untwisting wire is provided with a first clamping plane, and the second anti-untwisting wire faces one side of the first anti-untwisting wire. The side is provided with a second clamping plane, and the fiber thread is clamped between the first clamping plane and the second clamping plane.

By adopting the above technical solution, the clamping force on the fiber thread can be improved through the cooperation of the first clamping plane and the second clamping plane, and the fiber thread can be prevented from detaching from the spring coil.

Further, the first clamping plane and/or the second clamping plane are provided with friction particles.

By adopting the above technical solution, friction particles are used to increase the frictional force between the first clamping plane and the second clamping plane and the fiber thread, further improving the stability of the fiber thread after being fixed.

Further, a first fixing hole, a second fixing hole and a third fixing hole are provided on the side of the fixing end facing the first anti-untwisting wire and the second anti-untwisting wire, the first The fixing hole is spaced apart from the second fixing hole, 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 the third fixing hole There is a card slot between the second fixing hole; one end of the first anti-untwisting wire is inserted into the first fixing hole, and closely fits with the first fixing hole; The direction of the head, the second anti-untwisting wire sequentially includes a first inserting part, a breaking body, a connecting belt and a second inserting part, and one end of the first inserting part is configured to be able to connect with the second The fixing hole is plugged and closely matched, and the other end of the first plug-in part is connected to one end of the second plug-in part through the break body, and the break body is configured to be able to connect with the The first plug-in part and the second plug-in part are disconnected, the length of the snap-off body is equal to the length of the slot and can be snap-fitted into the slot, and the connecting straps are connected to the first slot respectively. The inserting part, the breaking body and the second inserting part are connected; wherein, the second anti-untwisting wire is connected to the fixed end in the following manner: the second anti-untwisting wire One end 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 insertion part, the other end of the breaking body is connected to the second insertion part, and The broken body is placed in the slot; the second insertion part is inserted into the third fixing hole.

By adopting the above technical scheme, the first fixing hole and the second fixing hole are used to facilitate the preliminary fixing of the first anti-untwisting yarn and the second anti-untwisting yarn, thereby facilitating the passing of the fiber thread, and through the design of the breaking body and the connecting belt , it is convenient to translate the second anti-untwisting thread to the third fixing hole for fixing, so that the first anti-untwisting thread and the second anti-untwisting thread fit side by side to clamp the fiber line, the structure is ingenious, and the operation is simple.

Further, the connecting belt is made of the same material as the second anti-untwisting thread, and is heat-fused connected with the first insertion part, the breaking body and the second insertion part.

By adopting the above technical solution, the structural stability of the second anti-untwisting wire can be further improved.

The present invention also provides a coil release system for blocking blood flow, which includes a catheter mechanism, a delivery mechanism, a release mechanism, and the coil for blocking blood flow as described in the above technical solution, at least part of the delivery mechanism, The release mechanism and the blood flow blocking spring coil are located in the catheter mechanism, and the distal end of the delivery mechanism is connected to the blood flow blocking spring coil through the release mechanism; wherein, The release mechanism is configured to act by operating the proximal end of the delivery mechanism, and the spring coil for blocking blood flow is disengaged from the delivery mechanism.

Using the above technical scheme, the binding structure of the fiber thread on the spring coil is improved. The fiber thread is initially fixed by the double-strand anti-untwisting wire, and then the two sides of the fiber thread are clamped and fixed by the elasticity of the spring body, without the need for The fiber thread is knotted. Compared with the traditional binding method, it is not only convenient to operate, but also has a better fixing effect, and there will be no problems of fiber thread falling off and increasing the outer diameter of the spring. Moreover, both sides of the fiber thread are located outside the spring body and are locked. Treatment can also further improve the embolism effect.

Further, 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 limitly cooperate with the first limiting portion; The first release part and the second release part are slidably installed in the guide sleeve, one end of the first release part is connected to the conveying mechanism, and the other end of the first release part is provided with a shape memory alloy part, One end of the second release member is provided with a slot for plugging and fitting with the shape memory alloy part, and the side wall of the slot is provided with a limiting groove, and the limiting groove has a space for the bending of the shape memory alloy part. space for deformation, the shape memory alloy part is configured to at least partly protrude into the limiting groove at a first temperature, and escape from the limiting groove at a second temperature, the first temperature being lower than the second temperature.

With the above-mentioned technical solution, there is no need for medical personnel to perform operations such as breaking and pulling wires for release, and the coil can be automatically untwisted by directly placing the coil in the blood for a certain period of time, which reduces the work of medical personnel and improves the efficiency and accuracy of release.

Further, the delivery mechanism includes a delivery tube connected to the release mechanism, the delivery tube is provided with a spiral groove along its length, from the proximal end to the distal end of the delivery tube, between two adjacent spiral grooves The distance between them gradually decreases.

With the above technical solution, the spiral groove is used to facilitate the curved delivery of the delivery tube, and the design of the gradual spacing is adopted, so that the delivery tube is gradually soft from the proximal end to the distal end, which enhances the delivery performance and reduces the impact on the catheter tip.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic structural view of the spring body of the spring coil for blocking blood flow provided by the embodiment of the present invention after stretching;

Fig. 2 is a schematic structural view of the fiber thread of the spring coil for blocking blood flow provided by the embodiment of the present invention after being clamped by the first anti-untwisting wire and the second anti-untwisting wire;

Fig. 3 is a schematic structural view of the fiber thread of the coil for blocking blood flow provided by the embodiment of the present invention after being wound into the first state of the first anti-untwisting wire and the second anti-untwisting wire;

Fig. 4 is a schematic structural view of the fiber thread of the coil for blocking blood flow provided by the embodiment of the present invention after being wound into the second state of the first anti-untwisting wire and the second anti-untwisting wire;

Fig. 5 is a schematic diagram of the structure of the fiber thread of the coil for blocking blood flow provided by the embodiment of the present invention after being wound into the third state of the first anti-untwisting wire and the second anti-untwisting wire;

Fig. 6 is a schematic diagram of the structure of the spring body of the spring coil for blocking blood flow provided by the embodiment of the present invention after the fiber line is implanted;

Fig. 7 is a schematic structural view of the spring coil for blocking blood flow provided by the embodiment of the present invention after the spring body forms the coil;

Fig. 8 is a schematic structural view of the fixed end of the spring coil for blocking blood flow and the second anti-untwisting wire provided by the embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a coil release system for blocking blood flow provided by an embodiment of the present invention;

Fig. 10 is a schematic structural view of the coil releasing system for blocking blood flow provided by the embodiment of the present invention after the coil is disengaged;

Fig. 11 is a schematic structural view of the delivery tube of the coil release system for blocking blood flow provided by an embodiment of the present invention.

Explanation of reference signs:

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

200-fiber thread; 210-first part; 220-second part;

300-the first anti-untwisting wire; 301-the first clamping plane;

400-second anti-untwisting wire; 401-second clamping plane; 410-first socket; 420-broken body; 430-connecting belt; 440-second socket;

500-catheter mechanism; 510-second limiting part;

600-conveying mechanism; 610-spiral groove;

700-release mechanism; 710-guide sleeve; 711-first limiting part; 720-first release part; 721-shape memory alloy part; 730-second release part; 731-slot.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In order to solve the problem of poor fixation effect existing in the existing fiber fixation method, which is likely to cause serious distal embolism, or increase the outer diameter of the spring wire at the knotting point and increase the resistance of delivery, this embodiment firstly provides A spring coil for blocking blood flow aims to solve the above technical problems by improving the structure of the coil and the fixing method of fiber threads.

As shown in Figure 6 and Figure 7, the coil for blocking blood flow in this embodiment includes a coil body 100 and a fiber wire 200, and the outer diameter of the distal end of the coil in this embodiment is designed to be the outer diameter of the proximal end. 60% to 80%, which facilitates the anchoring operation, makes the anchoring firmer, and is easier to fix and embolize in blood vessels with high blood flow. Specifically, the coil body 100 is formed by spiral processing of spring wire The spring body 110 is formed by winding, which is different from the traditional spring structure. In this embodiment, the spring wire is spirally wound to form the spring body 110. The existing spring structure of the spring body 110 is the same, and then the spring body 110 is passed through Bending or other ways to form a spring coil, the structural form of the spring coil can be a regular 3D spring in Figure 1, or an irregular 2D form (this form is not shown in the figure), the structural diagram of the spring body 110 Refer to Figure 2. It should be noted that the distance between the "distal end" and "near end" in this embodiment refers to the distance from the medical operator during the embolization operation.

The fiber thread 200 of this embodiment is partly located in the spring coil body 100, and at least one end protrudes from the outer surface of the spring coil body 100. Directionally, the spring body 110 of this embodiment is provided with a first anti-untwisting wire 300 and a second anti-untwisting wire 400, and one end of the first anti-untwisting wire 300 and the second anti-untwisting wire 400 are connected The fixed end 120 at the far end of the coil body 100 is connected. The functions of the first anti-untwisting wire 300 and the second anti-untwisting wire 400 are mainly to prevent accidental untwisting of the coil, and the coil can be recovered during operation by medical staff. , to avoid when the spring coil is recovered, the distal end of the spring coil is stuck or the resistance becomes larger, resulting in a larger pitch and untwisting.

Different from the traditional binding method of the fiber thread 200, the fiber thread 200 of this embodiment is fixed to the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400 through the following steps:

S1. Straighten the spring body before the spring body is wound into the spring coil body 100 to form the state in Figure 1, and stretch at least part of the spring body to a deformed state, and the spring wire of the stretched spring body forms a plurality of The first binding space; the stretching of the spring body in this step S1 can be realized 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 The two ends of the spring body are clamped and fixed, and the two first clamping mechanisms can approach or move away from each other, so as to realize stretching and fixing and releasing the stretching and fixing of the spring body.

S2. 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 straightening are passed through the channel formed by the spring body to ensure that the first anti-untwisting wire 300 and the second anti-untwisting wire The spinning wire 400 is in a parallel and fixed state up and down. At this time, a second binding space is formed between the first anti-unwinding wire 300 and the second anti-unwinding wire 400; shown) to achieve.

S3. Pass the double-strand closed-loop fiber thread 200 through the second binding space, and keep the middle part of the fiber thread 200 between the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400. At this time, the fiber thread 200 has The first part 210 is located on one side of the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400 , and the second part 220 is located on the other side of the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400 .

S4. Translate the first anti-untwisting yarn 300 or the second anti-untwisting yarn 400, so that the first anti-untwisting yarn 300 and the second anti-untwisting yarn 400 fit side by side, and clamp the fiber thread 200, forming Figure 2 state in .

S5. Fixedly connect 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. The specific fixed connection method is given below.

S6. Winding the first part 210 on the first anti-untwisting thread 300 and/or the second anti-untwisting thread 400 along the first circumferential direction, and wrapping the second part 220 on the second anti-untwisting thread along the second circumferential direction For the wire 400 and/or the first anti-untwisting wire 300, the first circumferential direction is the same as or opposite to the second circumferential direction. The winding process can be realized by a micro-manipulator.

There are many winding ways in this step. For example, as shown in FIG. 3, the first part 210 is wound up to the first anti-untwisting wire 300 of about half a turn, and the second part 220 is wound down to the second anti-untwisting thread of about half a turn. Of course, as shown in FIG. 4 , the wire 400 can also be wound downwards on the first part 210 so that the first part 210 is wound around the second anti-untwisting wire 400 for about half a circle, and wound up on the second part 220 so that the second part 220 is wound up to half a circle. The first anti-untwisting silk 300.

Of course, in order to improve the stability of the fiber thread 200 after winding, as shown in FIG. 5 , the second anti-untwisting yarn 400 can be wound downward for about half a circle after the first part 210 is wound upwards, and the second part 220 is wound downwards. Then wind up the first anti-untwisting wire 300 for about half a circle, and so on.

S7. The tension on the spring body is released, and the two adjacent coils of spring wire clamp the first part 210 and the second part 220 to form the state shown in FIG. 6 .

S8. Cutting the redundant first anti-untwisting wire 300 and the second anti-untwisting wire 400, and fixing the other end of the first anti-untwisting wire 300 and the other end of the second anti-untwisting wire 400.

The above-mentioned processing steps are adopted for the fiber thread, and while the double-strand anti-untwist yarn is used to prevent the untwisting of the spring coil, the fiber thread 200 is initially fixed by using the double-strand anti-twist yarn, and the first anti-twist yarn 300 is realized. It is integrated with the second anti-untwisting wire 400 for multiple purposes, and then the fiber thread 200 is wound and finally fixed by spring wire, without knotting the fiber thread 200. Compared with the traditional binding method, it is not only convenient to operate, but also fast The effect is good, and the fiber thread 200 will not fall off and the problem of increasing the outer diameter of the spring will not occur. Moreover, both sides of the fiber thread 200 are located outside the spring body and subjected to beating treatment, which can further improve the embolization effect.

In addition, in order to further improve the embolization effect, the step of binding the fiber thread 200 to the first anti-untwisting thread 300 and the second anti-untwisting thread 400 in this embodiment further includes: S9. The second part 220 is subjected to beating treatment, and the first part 210 and the second part 220 are both divided into a plurality of filaments. The beating device (not shown in the figure) can include a plurality of micro scrapers arranged side by side with gaps and a driving structure that drives the action of the micro scrapers. A single fiber thread 200 can form a plurality of fiber filaments after beating, and the number of fiber filaments depends on The number of micro scrapers and the number of actions are determined.

Optionally, the fiber thread 200 of this embodiment can be a double-strand closed-loop structure. In this way, the fiber thread 200 is designed as a closed-loop double-strand structure, which can further increase the strength of the fiber thread 200 after beating. Quantity, to further improve the embolization effect.

Optionally, in this embodiment, the length of the first part 210 of the filament is greater than the length of the second part 220. After the spring body is wound to form a coil, the first part 210 is located outside the coil, and the second part 220 is at least partially located in the spring. circle. In this way, the length of the first part 210 is designed to be greater than the length of the second part 220, so as to prevent the two from interfering with each other when they are wound by a structure such as a micro-manipulator, and placing the longer first part 210 outside the coil has a good effect. The embolization effect is improved, and the shorter second part 220 is placed in the coil, which can reduce the waste of fiber filaments while assisting embolization.

In addition, a first clamping plane 301 may be provided on the side of the first anti-untwisting wire 300 facing the second anti-untwisting wire 400 in this embodiment, and the second anti-untwisting wire 400 faces the first anti-untwisting wire 300 A second clamping plane 401 is provided on one side, and the fiber line 200 is clamped between the first clamping plane 301 and the second clamping plane 401, passing through the first clamping plane 301 and the second clamping plane 401 The cooperation can improve the clamping force on the fiber thread 200 and prevent the fiber thread 200 from detaching from the spring coil.

Optionally, friction particles (not shown in the figure) may be provided on the first clamping plane 301 and the second clamping plane 401 of this embodiment, and the first clamping plane 301 and the second clamping plane are improved by using the friction particles. The frictional force between the tight plane 401 and the fiber line 200 further improves the stability of the fiber line 200 after being fixed.

As shown in Figure 8, in order to facilitate the first anti-untwisting wire 300 and the second anti-untwisting wire 400 to be relatively fixed in step S2 to form a first binding space, and to facilitate the first anti-untwisting wire 300 and the second anti-untwisting wire 300 and the second anti-untwisting wire One of the two untwisting wires 400 moves to form a bonded state. This embodiment also improves the structure of the fixed end 120, and the fixed end 120 faces the first anti-untwisting wire 300 and the second anti-untwisting wire One side of 400 is provided with a first fixing hole 121, a second fixing hole 122 and a third fixing hole 123, the first fixing hole 121 is spaced from the second fixing hole 122, and the third fixing hole 123 is located between the first fixing hole 121 and the third fixing hole 123. Between the second fixing holes 122 and adjacent to the first fixing holes 121 , there is a locking slot 124 between the third fixing holes 123 and the second fixing holes 122 .

One end of the first anti-untwisting wire 300 in this embodiment is inserted into the first fixing hole 121 and closely fits with the first fixing hole 121; It includes a first plugging part 410, a breaking body 420, a connecting band 430 and a second plugging part 440. One end of the first plugging part 410 is configured to be plugged into and closely fitted with the second fixing hole 122. The first plugging part The other end of the connecting part 410 is connected to one end of the second plugging part 440 through a breaking body 420, and the breaking body 420 is configured to be disconnected from the first plugging part 410 and the second plugging part 440 under the action of an external force, The length of the snap-off body 420 is equal to the length of the slot 124 and can be clipped in the slot 124 . The connecting band 430 is respectively connected to the first insertion portion 410 , the snap-off body 420 and the second insertion portion 440 .

Wherein, 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 the breaking body 420 of the embodiment, one end of the breaking body 420 is disconnected from the first insertion part 410, and the other end of the breaking body 420 is connected to the second insertion part 440, and the breaking body 420 is placed in the slot 124; The insertion portion 440 is inserted into the third fixing hole 123 .

The above-mentioned structural design utilizes the first fixing hole 121 and the second fixing hole 122 to facilitate the preliminary fixing of the first anti-untwisting thread 300 and the second anti-untwisting thread 400, thereby facilitating the passing of the fiber thread 200, and passing through the breaking body 420 and The design of the connecting belt 430 is convenient for translating the second anti-untwisting thread 400 to the third fixing hole 123 for fixing, so that the first anti-untwisting thread 300 and the second anti-untwisting thread 400 fit side by side to clamp the fiber line 200, The structure is ingenious and the operation is simple.

Optionally, the material of the connecting belt 430 in this embodiment is the same as that of the second anti-untwisting wire 400, for example, both are alloys or polymer materials, and are connected with the first insertion part 410, the breaking body 420 and the second insertion part 440. Hot-melt connection to further improve the structural stability of the second anti-untwisting wire 400 .

As shown in FIG. 9 and FIG. 10 , based on the above-mentioned coil structure, the present invention also provides a coil release system for blocking blood flow, which includes a catheter mechanism 500, a delivery mechanism 600, a release mechanism 700 and the above-mentioned The coil for blocking blood flow, wherein at least part of the delivery mechanism 600, the release mechanism 700 and the coil for blocking blood flow are located in the catheter mechanism 500, and the distal end of the delivery mechanism 600 and the coil for blocking blood flow pass through the release mechanism 700; and, the release mechanism 700 of this embodiment is configured to: operate the proximal release mechanism 700 of the delivery mechanism 600 to act, and the spring coil for blocking blood flow is separated from the delivery mechanism 600 .

The coil release system for blocking blood flow in this embodiment improves the binding structure of the fiber thread 200 on the coil. The fiber thread 200 is initially fixed by a double-strand anti-untwisting thread, and then the fiber thread is fixed by the elasticity of the spring body. The two sides of the 200 are clamped and fixed without knotting the fiber thread 200. Compared with the traditional binding method, it is not only convenient to operate, but also has a better fixing effect, and there will be no problems of the fiber thread 200 falling off and increasing the outer diameter of the spring. Both sides of the fiber thread 200 are located outside the body of the spring and subjected to beating treatment, which can also further improve the embolism effect.

There are various structural forms of the release mechanism 700 in this embodiment. For example, the existing double "S" curved mechanical release structure (this structure is not shown in the figure) can be used, which can be divided into S-curve and implant S-curve after integral cutting and molding. The S-bend of the delivery system, the S-bend of the implant is connected to the coil, the S-bend of the delivery system is connected to the delivery mechanism 600, the S-bend of the implant and the delivery system S-bend are connected by inserting a release wire in the middle of the delivery mechanism 600; the coil needs to be released At the same time, break off the proximal part of the delivery mechanism 600, and then stretch the release wire from the proximal end to separate the S-bend of the implant from the S-bend of the delivery system. The length of the release area is less than 2mm, reducing the impact on the catheter tip during delivery. , to avoid the phenomenon of kicking the tube after release; specifically, connect the proximal end of the release wire to the release tube, and spot-weld the release tube to the delivery system; when release is required, break the point-shaped welding point and pull the release tube back , the release wire moves back correspondingly to realize release; no handle, power supply and 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.

The connection between the release wire and the release tube can be in the following ways: A. welding; insert the release wire into the release tube, and use the mandrel to stick the release wire to the wall, and perform laser welding on the outer surface of the release tube to make the release wire and release tube The tubes are connected together; laser welding can be continuous welding or spot welding to achieve connection strength; B. Crimping: insert the release wire into the release tube, and use a crimping tool or equipment to press the release tube to make the release wire and release The tubes are connected together; the crimping grip can be continuous or dotted to achieve connection strength; C. Bonding: insert the release wire into the release tube, and inject glue into the release tube to realize the connection.

The connection between the release pipe and the delivery system can be spot welding, such as 180-degree intervals (2 points), 120-degree intervals (3 points), 90-degree intervals (4 points), to achieve a balance between connection strength and breaking force; That is, it can avoid accidental breaking and accidental release before use, and can also ensure that the breaking force required for breaking will not be too large, meeting the use requirements, reducing the difficulty of operation and reducing the operation time.

The inventor found that in the existing release mechanism 700, the two release parts are generally connected by a release line. The release line needs to pass through the delivery tube of the delivery mechanism 600, and a break line is provided on the delivery tube. When it is necessary to release the coil In this case, the medical personnel need to manually break the breaking line of the delivery tube, and then pull the release line to release the fitting connection of the two release parts. This method is not only cumbersome to operate, but also needs to make more structural improvements to the delivery tube of the delivery mechanism 600 , In addition, in the process of pulling the release thread, the problems of release failure, jamming and breakage of the release thread are prone to occur. Therefore, this embodiment also provides a new coil release mechanism 700 .

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 limiter 711, and the inner wall of the distal end of the catheter mechanism 500 is provided with a second limiter that can be limitedly matched with the first limiter 711 part 510; the first release part 720 and the second release part 730 are slidably installed in the guide sleeve 710, one end of the first release part 720 is connected with the conveying mechanism 600, and the other end of the first release part 720 is provided with a shape memory alloy part 721, One end of the second release member 730 is provided with a slot 731 that is plugged and fitted with the shape memory alloy portion 721. The side wall of the slot 731 is provided with a limiting groove, and there is a space for the shape memory alloy portion 721 to bend and deform in the limiting groove. As shown in Figure 9, the shape memory alloy part 721 is configured to at least partially extend into the limiting groove at the first temperature, and as shown in Figure 10, the shape memory alloy part 721 is out of the limiting groove at the second temperature, 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.

When the release mechanism 700 of this embodiment releases the coil, it does not need the medical personnel to perform operations such as breaking and pulling the wire for release, and the coil can be automatically untwisted by directly placing the coil in the blood for a certain period of time, which reduces the work of the medical staff and improves Learn about release efficiency and accuracy.

As shown in Figure 11, the delivery mechanism 600 of this embodiment includes a delivery tube connected to the release mechanism 700, and the delivery tube is provided with a spiral groove 610 along its length, from the proximal end to the far end of the delivery tube, two adjacent The distance between the spiral grooves 610 is gradually reduced, and the spiral groove 610 is used to facilitate the bending of the delivery tube, and the design of the gradual spacing is adopted, so that the delivery tube is gradually soft from the proximal end to the distal end, which enhances the delivery performance and reduces the stress on the catheter tip. Influence.

Specifically, the conveying tube of the conveying mechanism 600 of this embodiment is cut in a "helical, intermittent, step-by-step" manner at the far end, with a cutting width of 0.01mm-2mm and a spiral pitch of 0.1mm-10mm, which changes step by step and is intermittent. The ratio is 180° (cutting area): 45° (uncutting area), and a gradual change (note: intermittent ratio refers to, according to the defined cutting width and pitch, after cutting 180°, stop cutting 45°, and cut 180° again, Stop cutting 45° and cycle like this ;).

The above-mentioned structural design has the following advantages: A. Gradual cutting, realizing the perfect combination of proximal support and distal flexibility; B. Gradually increasing screw pitch, realizing the smooth change of hardness and enhancing the transmission of pushing force; C. The distal end Soft design, enhance the delivery performance, reduce the impact on the catheter tip; D. Intermittent cutting, enhance the anti-ovalization performance, avoid excessive softness after excessive cutting in some areas, ovalize and squeeze the release wire during use, and increase the release and pull-out resistance, which may lead to failures such as inability to release the device.

In addition, the spring coil release system for blocking blood flow in this embodiment is also provided with a marking ring (not shown in the figure). When the first coil is implanted, the imaging performance of the coil itself will block the catheter tip. Development; therefore, the conventional coil catheter has 2 marking rings with a distance of 3cm; therefore, the product needs to have a developing mark at 3cm from the coil, and when the mark is aligned with the proximal mark of the catheter, it will start to be released; so the marking ring The assembly accuracy is very high; therefore, this embodiment has a new design for the marking ring, and the marking ring is installed on the release wire, and the marking ring is fixed at the required position by welding, swaging, bonding and other methods; the marking ring It can be wound wire, pipe or C-shaped tube; the traditional design is to place the mark on the outer surface of the conveying system, on the one hand, it increases the outer diameter and increases the conveying resistance; on the other hand, there are steps at both ends of the marking ring, which is easy to get stuck The new design completely avoids this problem; and in the traditional design, in order to reduce the outer diameter, the wall thickness of the marking ring needs to be reduced, which increases the difficulty of connection; the new design of this embodiment will mark the ring Fixed on the release wire, the process is simple and easy to operate. When it needs to be released, pull the release wire proximally to release the implant; at this time, the marking ring on the release wire will move a certain distance to the proximal end to match the mark on the catheter. The deviation of the ring plays an indicator role, indicating that the implant has been released, which is convenient for doctors to operate.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims. Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

Claims (10)

1. The spring ring for blocking the blood flow comprises a spring ring body (100) and a fiber wire (200), wherein the spring ring body (100) is formed by winding a spring body (110) formed by spirally processing a spring wire, at least part of the fiber wire (200) is positioned in the spring ring body (100), and at least one end of the fiber wire extends out of the outer surface of the spring ring body (100);

the spring body (110) is internally provided with a first anti-unscrewing wire (300) and a second anti-unscrewing wire (400) which are attached side by side in a penetrating manner, and the fiber wire (200) is bound on the first anti-unscrewing wire (300) and the second anti-unscrewing wire (400) in the following manner:

s1, straightening a spring body (110) before the spring body (110) is wound and molded into a spring ring body (100), stretching at least part of the spring body (110) to a deformation state, and forming a plurality of first binding spaces by spring wires of the stretched spring body (110);

s2, penetrating a first anti-unscrewing wire (300) and a second anti-unscrewing wire (400) which are longer than the straightened spring body (110) into a channel formed by the spring body (110), ensuring that the first anti-unscrewing wire (300) and the second anti-unscrewing wire (400) are in a vertically parallel and fixed state, and forming a second binding space between the first anti-unscrewing wire (300) and the second anti-unscrewing wire (400);

s3, a double-stranded closed-loop type fiber wire (200) is passed through the second binding space, and the middle part of the fiber wire (200) is kept between the first anti-unscrewing-resistant wire (300) and the second anti-unscrewing-resistant wire (400), and the fiber wire (200) is provided with a first part (210) on one side of the first anti-unscrewing-resistant wire (300) and the second anti-unscrewing-resistant wire (400) and a second part (220) on the other side of the first anti-unscrewing-resistant wire (300) and the second anti-unscrewing-resistant wire (400);

s4, translating the first anti-unscrewing yarns (300) or the second anti-unscrewing yarns (400), enabling the first anti-unscrewing yarns (300) and the second anti-unscrewing yarns (400) to be attached side by side, and clamping the fiber wires (200);

s5, fixedly connecting one end of the first anti-unscrewing wire (300) and one end of the second anti-unscrewing wire (400) with a fixed end (120) of the spring body (110);

s6, overlapping and winding the first part (210) on the first anti-unscrewing wires (300) and/or the second anti-unscrewing wires (400) along a first circumferential direction, overlapping and winding the second part (220) on the second anti-unscrewing wires (400) and/or the first anti-unscrewing wires (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 tension of the spring body (110), and clamping the first part (210) and the second part (220) by two adjacent turns of the spring wire;

s8, cutting redundant first anti-unscrewing yarns (300) and second anti-unscrewing yarns (400), and fixedly connecting the other ends of the first anti-unscrewing yarns (300) and the second anti-unscrewing yarns (400).

2. The blood flow blocking spring coil of claim 1, wherein the step of passing the fiber strand (200) over the first anti-unwinding wire (300) and the second anti-unwinding wire (400) further comprises:

s9, performing a lock making treatment on the first part (210) and the second part (220), and dividing the first part (210) and the second part (220) into a plurality of fiber filaments.

3. The occlusion coil of claim 1, wherein the first portion (210) has a length greater than the length of the second portion (220), the first portion (210) being disposed outside the coil and the second portion (220) being disposed at least partially within the coil after the coil is formed by winding the body (110).

4. A blood flow blocking spring coil as set forth in claim 1, wherein a side of the first anti-unscrewing wire (300) facing the second anti-unscrewing wire (400) is provided with a first clamping plane (301), a side of the second anti-unscrewing wire (400) facing the first anti-unscrewing wire (300) is provided with a second clamping plane (401), and the fiber wire (200) is clamped between the first clamping plane (301) and the second clamping plane (401).

5. A blood flow occlusion coil as claimed in claim 4, characterised in that the first clamping plane (301) and/or the second clamping plane (401) is provided with friction particles.

6. A blood flow blocking coil as claimed in claim 1, wherein the side of the fixing end (120) facing the first anti-unscrewing wire (300) and the second anti-unscrewing wire (400) is provided with a first fixing hole (121), a second fixing hole (122) and a third fixing hole (123), the first fixing hole (121) and the second fixing hole (122) are arranged at intervals, the third fixing hole (123) is located between the first fixing hole (121) and the second fixing hole (122) and adjacent to the first fixing hole (121), and a clamping groove (124) is arranged between the third fixing hole (123) and the second fixing hole (122);

one end of the first anti-unscrewing wire (300) is inserted into the first fixing hole (121) and is tightly matched with the first fixing hole (121);

along the direction departing from the fixing end head (120), the second anti-unscrewing wire (400) sequentially comprises a first inserting portion (410), a breaking body (420), a connecting band (430) and a second inserting portion (440), one end of the first inserting portion (410) is configured to be capable of being inserted into the second fixing hole (122) and tightly matched with the second fixing hole, the other end of the first inserting portion (410) is connected with one end of the second inserting portion (440) through the breaking body (420), the breaking body (420) is configured to be capable of being disconnected from the first inserting portion (410) and the second inserting portion (440) under the action of external force, the length of the breaking body (420) is equal to that of the clamping groove (124) and capable of being clamped in the clamping groove (124), and the connecting band (430) is respectively connected with the first inserting portion (410), the breaking body (420) and the second inserting portion (440);

wherein the second anti-unwinding wire (400) is connected with the fixing tip (120) by:

inserting one end of the second anti-rotation wire (400) into the second fixing hole (122);

breaking the breaking body (420) to disconnect one end of the breaking body (420) from the first insertion part (410), disconnecting the other end of the breaking body (420) from the second insertion part (440), and placing the breaking body (420) in the clamping groove (124);

and inserting the second inserting part (440) into the third fixing hole (123).

7. The blood flow occlusion coil as set forth in claim 6, wherein said connecting band (430) is made of the same material as said second anti-unwinding wire (400), and is thermally fused to said first insertion portion (410), said breaking body (420) and said second insertion portion (440).

8. A blood flow occlusion coil release system comprising a catheter mechanism (500), a delivery mechanism (600), a release mechanism (700), and the blood flow occlusion coil of any of claims 1-7, at least some of the delivery mechanism (600), the release mechanism (700), and the blood flow occlusion coil being disposed within the catheter mechanism (500), the distal end of the delivery mechanism (600) being coupled to the blood flow occlusion coil via the release mechanism (700); wherein the release mechanism (700) is configured to: the release mechanism (700) is actuated to operate the proximal end of the delivery mechanism (600), and the blood flow occlusion coil is disengaged from the delivery mechanism (600).

9. The occlusion coil release system of claim 8, wherein 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 arranged in the catheter mechanism (500), the outer diameter of the guide sleeve (710) is smaller than the inner diameter of the catheter mechanism (500), a first limiting part (711) is arranged on the outer wall of the far end of the guide sleeve (710), and a second limiting part (510) which can be in limiting fit with the first limiting part (711) is arranged on the inner wall of the far end of the catheter mechanism (500); the first release piece (720) and the second release piece (730) are slidably mounted in the guide sleeve (710), one end of the first release piece (720) is connected with the conveying mechanism (600), the other end of the first release piece (720) is provided with a shape memory alloy part (721), one end of the second release piece (730) is provided with a slot (731) which is in plug-in fit with the shape memory alloy part (721), the side wall of the slot (731) is provided with a limiting groove, the limiting groove is internally provided with a space for bending deformation of the shape memory alloy part (721), the shape memory alloy part (721) is configured to at least partially extend into the limiting groove at a first temperature and separate from the limiting groove at a second temperature, and the first temperature is lower than the second temperature.

10. The blood flow occlusion coil release system of claim 8, wherein the delivery mechanism (600) comprises a delivery tube connected to the release mechanism (700), the delivery tube defining a spiral groove (610) along its length, the distance between two adjacent spiral grooves (610) decreasing from a proximal end to a distal end of the delivery tube.

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