A spring ring release system

Abstract

The application relates to the technical field of medical devices, in particular to a spring coil releasing system. The spring coil releasing system comprises: an implanted spring coil connected with a first conveying structure through a core wire; and a first conveying structure and a second conveying structure which are mutually sleeved, wherein the first conveying structure and the second conveying structure can relatively move along the axial direction, so that the distal end of the first conveying structure and the core wire are exposed in a conductive fluid when the second conveying structure moves towards the proximal end relative to the first conveying structure, the core wire is corroded, and the releasing is completed; or when the first conveying structure moves towards the proximal end relative to the second conveying structure, the implanted spring coil abuts against the distal end of the second conveying structure until the core wire is broken, and the releasing is completed. The spring coil releasing system provided by the application has various releasing modes and wide application range.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and specifically to a coil release system. Background Technology

[0002] Coils are implantable occluders used to close arteriovenous malformations and aneurysms, and are also commonly used for emergency vascular closure in cases of accidental bleeding during surgery. The mechanism of action of coils is to reduce local blood flow velocity and promote thrombus formation, thereby achieving a closure effect. To ensure accurate delivery and release of the coils, a delivery device is required during implantation to transport the coils to the lesion site. The delivery device and the coils are two separate components; after implantation, the coils need to be detached from the delivery device. Detachment methods include mechanical, electrochemical, electrothermal, and hydrolytic detachment.

[0003] Conventional spring coils only have one release method during use, but due to their mechanisms, each release method has its own working principle and advantages and disadvantages. For example, mechanical release has high reliability, but misalignment and stretching may occur during the transport process, leading to premature release; electrochemical release has a stable structure, but requires a sufficiently liquid environment for release; electrothermal release may cause additional localized heating and tissue damage, making it less applicable. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the existing spring coil release system, which has a single release method and poor applicability, and thus provide a spring coil release system with diverse release methods and a wide range of applications.

[0005] To solve the above-mentioned technical problems, the present invention provides a spring coil release system, comprising:

[0006] An implanted spring coil is connected to the first conveying structure via a core wire.

[0007] The first and second conveying structures are nested together, and both can move relative to each other along the axial direction. When the second conveying structure moves towards the proximal end relative to the first conveying structure, the distal end of the first conveying structure and the core wire are exposed to the conductive fluid, causing the core wire to be corroded and thus completing the release. Alternatively, when the first conveying structure moves towards the proximal end relative to the second conveying structure, the implanted spring coil abuts against the distal end of the second conveying structure until the core wire breaks, thus completing the release.

[0008] Optionally, both the first and second conveying structures can move relative to each other along the axial direction, so that when the second conveying structure moves towards the proximal end relative to the first conveying structure and the first conveying structure is stationary, the distal end of the first conveying structure and the core wire are exposed to the conductive fluid, causing the core wire to be corroded and thus completing the release; or, when the first conveying structure moves towards the proximal end relative to the second conveying structure and the second conveying structure is stationary, the implanted spring coil abuts against the distal end of the second conveying structure until the core wire breaks, thus completing the release.

[0009] Optionally, the distal end of the second delivery structure has a frustoconical head, the outer diameter of the small end of the head being smaller than the outer diameter of the implanted spring coil.

[0010] Optionally, the inner diameter of the second conveying structure is 110%-125% of the outer diameter of the first conveying structure.

[0011] Optionally, the hardness of the first conveying structure and the second conveying structure gradually decreases from the proximal end to the distal end along the axial direction.

[0012] Optionally, the first conveying structure is made of coils with progressively increasing pitch from the proximal end to the distal end along the axial direction, or...

[0013] The cutting density of the second conveying structure gradually increases from the proximal end to the distal end along the axial direction, and the distal head of the second conveying structure is not cut.

[0014] Optionally, the proximal end of the first conveying structure extends to the outside of the proximal end of the second conveying structure, and a thickening layer is provided at the proximal end of the first conveying structure, wherein the outer diameter of the thickening layer is not less than the inner diameter of the second conveying structure.

[0015] Optionally, the thickened layer is an insulating layer.

[0016] Optionally, the first delivery structure is made of one or more metals that are conductive and biocompatible, and the second delivery structure is made of a biocompatible metal or polymer.

[0017] Optionally, the proximal end of the first conveying structure is further provided with an electrolytic converter adapter area.

[0018] The technical solution of this invention has the following advantages:

[0019] 1. The coil release system provided by this invention can preferentially use electrolytic release when occluding blood vessels, filling aneurysms, or when blood vessels near the lesion are tortuous or fragile. This involves moving the second delivery structure proximally relative to the first delivery structure, exposing the distal end of the first delivery structure and the core wire to the conductive fluid, causing the core wire to corrode and complete the release, thus leveraging the advantages of electrolytic release. When performing aneurysm termination, in other locations with extremely slow blood flow, or when continuous saline perfusion cannot be performed in the catheter for other reasons, a mechanical release method can be used. This involves moving the first delivery structure proximally relative to the second delivery structure, causing the implanted coil to contact the distal end of the second delivery structure until the core wire breaks, thus leveraging the advantages of mechanical release. This provides multiple release methods under different lesion conditions and risk scenarios, improving its applicability.

[0020] 2. The spring coil release system provided by the present invention, wherein the thickened layer of the first conveying structure can prevent the second conveying structure from excessively retracting when moving towards the proximal end, thereby avoiding detachment and serving as a limiting function.

[0021] 3. The spring coil release system provided by the present invention, with the frustoconical head of the second delivery structure, can ensure that the implanted spring coil abuts against the head of the second delivery structure during mechanical release, thus ensuring the smooth breakage of the core wire, while reducing the sharpness of the head of the second delivery structure to avoid scratching blood vessels.

[0022] 4. The spring coil release system provided by the present invention has a first conveying structure and a second conveying structure whose hardness gradually decreases from the proximal end to the distal end along the axial direction to ensure the effectiveness of pushing and transmitting, while also having a certain bending capability. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the spring coil release system provided by the present invention;

[0025] Figure 2 for Figure 1 Sectional view along line A-A;

[0026] Figure 3 A schematic diagram illustrating one embodiment of the second conveying structure;

[0027] Figure 4 A schematic diagram of another embodiment of the second conveying structure.

[0028] Figure 5 This is a schematic diagram of the first conveying structure;

[0029] Figure 6 A schematic diagram of the spring coil release system provided by the present invention during electrical release;

[0030] Figure 7 for Figure 6 Enlarged schematic diagram of part B;

[0031] Figure 8 for Figure 6 An enlarged schematic diagram of section C;

[0032] Figure 9 A schematic diagram of the spring coil release system provided by the present invention during mechanical release;

[0033] Figure 10 for Figure 9 An enlarged schematic diagram of section D in the middle;

[0034] Figure 11 for Figure 9 An enlarged schematic diagram of section E in the middle.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Core wire; 2. First conveying structure; 3. Embedded spring coil; 4. Second conveying structure; 5. Electrolytic converter adapter area; 6. Head; 7. Thickened layer; 8. Adhesive; 21. Proximal end; 22. First intermediate end; 23. Second intermediate end; 24. Transition end; 25. Distal end. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figures 1 to 11One specific embodiment of the spring coil release system shown includes an implanted spring coil 3 connected to a first delivery structure 2 via a core wire 1, a first delivery structure 2 and a second delivery structure 4 nested together, and an electric release adapter area 5 located near the first delivery structure 2.

[0040] During electrical release, the second delivery structure 4 moves proximally relative to the first delivery structure 2. When the second delivery structure 4 moves to the point where both the distal end of the first delivery structure 2 and the core wire 1 are exposed to the conductive fluid, the core wire 1 is corroded, completing the release. The conductive fluid here includes, but is not limited to, human body fluids, blood, etc. During mechanical release, the first delivery structure 2 moves proximally relative to the second delivery structure 4. When the implanted spring coil 3 comes into contact with the distal end of the second delivery structure 4, the implanted spring coil 3 and the second delivery structure 4 are relatively stationary, continuously applying a pull-back force to the proximal end of the first delivery structure 2. This force is simultaneously borne by the core wire, the second delivery structure 4, and the first delivery structure 2. Since the outer diameter of the core wire 1 in the release zone is small, it will break first when the critical tension is reached, completing the release.

[0041] The implanted coil 3 is made of radiopaque metal wire, such as platinum-tungsten alloy, and has a secondary spiral winding configuration and a tertiary configuration in three-dimensional space. During delivery in the system, it is in an unreleased state with a secondary configuration. Once released and positioned at the target lesion site, such as a blood vessel or aneurysm, it is in a released state with a tertiary configuration. Figure 1 This represents the secondary form in the unreleased state.

[0042] The implanted spring coil 3 is connected to the first delivery structure 2 by a core wire 1 that runs through the first delivery structure 2. The connection can be made by adhesive bonding or heat shrink tubing, and the exposed part is the release zone. To ensure release efficiency and reduce the amount of release zone remaining in the body after release, the outer diameter of the core wire 1 and the length of the release zone are both small and much smaller than the inner diameter of the first delivery structure 2. Specifically, the core wire 1 is a metal wire with high biocompatibility or containing metallic elements naturally present in the human body, such as stainless steel (iron).

[0043] The first conveying structure 2 and the second conveying structure 4 can move relative to each other along the axial direction. They are preferably tubular, but other shapes are also possible and not specifically limited here. The outer diameter of the first conveying structure 2 is less than the inner diameter of the second conveying structure 4, which is less than the outer diameter of the electric decoupling adapter area 5. Specifically, the inner diameter of the second conveying structure 4 is 110%-125% of the outer diameter of the first conveying structure 2 to ensure the effective transmission of pushing force by the second and first conveying structures. During the delivery of the implanted spring coil 3, the second conveying structure 4 transmits the force to the outer surface of the implanted spring coil 3, while the first conveying structure 2 transmits the force to the release area and the inner surface of the implanted spring coil 3. Their combined action smoothly transmits the pushing force applied by the proximal hand to the distal end, making the placement of the implanted spring coil 3 easier. Simultaneously, the head of the second conveying structure 4 crosses the release area and contacts the proximal end of the implanted spring coil 3, protecting the release area and preventing damage such as bending to the most vulnerable part of the release area during delivery. Furthermore, the second conveying structure 4 directly contacts the implanted spring coil 3, resulting in better support.

[0044] like Figure 3 As shown, the distal end of the second delivery structure 4 has a frustoconical head 6, the outer diameter of the small end of the head 6 being smaller than the outer diameter of the implanted spring coil 3. The material of the second delivery structure 4 is a metal or polymer with certain strength and biocompatibility, such as platinum-tungsten alloy, nickel-cadmium alloy, stainless steel, polyetheretherketone, polytetrafluoroethylene, etc.

[0045] like Figure 4 In another embodiment of the second conveying structure shown, the hardness of the second conveying structure 4 gradually decreases axially from the proximal end d to the distal end a. Specifically, a continuous cutting method along the axial direction can be adopted, so that the cutting density of the second conveying structure 4 gradually increases axially from the proximal end to the distal end, thereby ensuring that the hardness of the second conveying structure 4 gradually decreases from the proximal end to the distal end, and the distal head 6 of the second conveying structure 4 is not cut to ensure that the hardness is the highest at this point, thus ensuring the strength required for mechanical release.

[0046] Of course, the second conveying structure 4 can also be made of coils with high hardness or high winding density, coils with medium hardness or medium winding density, and coils with softness or low winding density along the axial direction from the near end to the far end.

[0047] like Figure 5As shown, the first conveying structure 2 is made of one or more conductive and biocompatible metals, such as platinum-tungsten alloy, nickel alloy, stainless steel, etc. The hardness of the first conveying structure 2 gradually decreases axially from the proximal end to the distal end. Specifically, the gradual decrease in hardness includes, but is not limited to: the first conveying structure 2 being made of coils with progressively increasing pitch axially from the proximal end to the distal end; or sequentially using an uncut, high-hardness, intact tube as the proximal end 21, a lower-hardness cut tube as the first intermediate end 22, a coil with lower hardness or higher pitch as the second intermediate end 23, a coil of other materials or with a higher pitch as the transition end 24, and a soft or wound coil with an even higher pitch as the distal end 25. The transition end 24 can use a radiopaque metal material, such as platinum-tungsten alloy, to provide radiographic visibility when used with a conveying system. The distal end of the first conveying structure 2 is fixed to the core wire 1 with adhesive 8. Except for the distal end, which lacks an insulating layer, the outer surface of the first conveying structure 2 is coated along its remaining length, such as using a polymer coating or heat-shrink tubing. The proximal end of the first conveying structure 2 extends to the outside of the proximal end of the second conveying structure 4, and a thickening layer 7 is provided at the proximal end of the first conveying structure 2. The outer diameter of the thickening layer 7 is not less than the inner diameter of the second conveying structure 4. Specifically, the thickening layer 7 is an insulating layer. The outer surface of the proximal end of the first conveying structure 2 is covered with an insulating layer, such as insulating glue or polymer heat shrink tubing. The insulating layer serves to isolate the first conveying structure 2 and the second conveying structure 4 to prevent short circuits, and also acts as a limiting device for the second conveying structure 4 during electrolytic decoupling. A portion of the proximal end enters the inner cavity of the electrolytic decoupling adapter area 5, and the gap between the two is filled and fixed by insulating polymer heat shrink tubing or insulating glue. The electrolytic decoupling adapter area 5 can enter the electrolytic decoupling device and serves to conduct electricity during electrolytic decoupling.

[0048] like Figures 6 to 8 As shown, during electrolysis, the second conveying structure 4 moves toward the proximal end while the first conveying structure 2 remains stationary. When the second conveying structure 4 moves to the point where the distal uninsulated portion of the first conveying structure 2 and the core wire 1 are both exposed to the conductive fluid (i.e., the human body fluid environment), the distal uninsulated portion and the core wire 1 simultaneously come into contact with the human body fluid environment, together forming the positive and negative electrodes required for electrolysis. Then, the electrolysis adapter 5 is inserted into the electrolysis device to form a circuit. After energization, electrochemical corrosion can occur, and the core wire in the decomposition area is corroded, thus completing the decomposition.

[0049] like Figures 9 to 11As shown, during mechanical release, the first conveying structure 2 moves towards the proximal end while the second conveying structure 4 remains stationary, causing the implanted spring coil 3 to abut against the distal end of the second conveying structure 4. At this time, the implanted spring coil 3 and the second conveying structure 4 are relatively stationary, continuously applying a pulling force towards the proximal end to the first conveying structure 2. This force is simultaneously borne by the core wire, the second conveying structure 4, and the first conveying structure 2. Since the outer diameter of the core wire 1 in the release zone is small, it will break first when the critical tension is reached, thus completing the release.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A spring ring release system characterized by, The implanting spring ring (3) is connected with the first delivery structure (2) through the core wire (1). The first delivery structure (2) and the second delivery structure (4) are sleeved with each other and can be relatively moved in the axial direction, so that the distal end of the first delivery structure (2) and the core wire (1) are exposed to the conductive fluid when the second delivery structure (4) moves towards the proximal end relative to the first delivery structure (2) and the first delivery structure (2) is static, so that the core wire (1) is corroded and the detachment is completed; when the first delivery structure (2) moves towards the proximal end relative to the second delivery structure (4) and the second delivery structure (4) is static, the implanting spring ring (3) abuts against the distal end of the second delivery structure (4) until the core wire (1) is broken, and the detachment is completed. The distal end of the second delivery structure (4) has a frustoconical head (6), and the outer diameter of the small end of the head (6) is smaller than the outer diameter of the implanting spring ring (3).

2. The spring coil release system of claim 1, wherein, The inner diameter of the second delivery structure (4) is 110%-125% of the outer diameter of the first delivery structure (2).

3. The spring ring release system of claim 1, wherein, The hardness of the first delivery structure (2) and the second delivery structure (4) gradually decreases from the proximal end to the distal end in the axial direction.

4. The spring ring release system of claim 1, wherein, The first delivery structure (2) is made of coils with gradually increasing pitches from the proximal end to the distal end in the axial direction, or 5. The spring ring release system of claim 4, wherein, The cutting density of the second delivery structure (4) gradually increases from the proximal end to the distal end in the axial direction, and the distal head (6) of the second delivery structure (4) is not cut. The proximal end of the first delivery structure (2) extends to the outside of the proximal end of the second delivery structure (4), and a thickened layer (7) is arranged at the proximal end of the first delivery structure (2), and the outer diameter of the thickened layer (7) is not less than the inner diameter of the second delivery structure (4).

6. The spring coil release system of claim 1, wherein, The thickened layer (7) is an insulating layer.

7. The spring coil release system of claim 6, wherein, The material of the first delivery structure (2) is one or more metals that are conductive and have biocompatibility, and the material of the second delivery structure (4) is a metal or a polymer that has biocompatibility.

8. The frisket system of any of claims 1-7, wherein, The proximal end of the first delivery structure (2) is further provided with an electrolytic detacher adaptation area (5).

9. The spring coil release system according to any one of claims 1-7, wherein, ​

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