Embolism spring ring easy and convenient to release and completely controllable and using method thereof

Abstract

The invention relates to the technical field of embolism spring rings, in particular to an embolism spring ring easy and convenient to release and completely controllable and a using method thereof. The device comprises an embolism spring ring, a conveying guide wire, an interlocking structural part used for connecting the embolism spring ring and the conveying guide wire, a release adjusting mechanism arranged in the conveying guide wire, and a release control wire connected with the release adjusting mechanism and the interlocking structural part. When the spring ring is conveyed to a corresponding arterial malformation lesion target part such as aneurysm in a clinical universal mode, the placing position of the spring ring can be flexibly adjusted before release, the release part of the spring ring cannot be released immediately after completely leaving the conveying catheter, and release is completely controllable; and during disengagement, the far end and the near end of the conveying guide wire are separated in a physical mode, disengagement of the spring ring can be simply and rapidly achieved, and a disengageable spring ring choice which is low in risk, efficient, controllable, economical and practical is provided for clinic.

Description

Technical Field

[0001] The present invention relates to the technical field of embolic spring coils, and in particular to an embolic spring coil which is easy to release and fully controllable, and a use method thereof. Background Art

[0002] Embolization coils are a type of minimally invasive interventional device widely used in the medical field, mainly used for vascular embolization. This device is usually made of metal materials and introduced into the target blood vessel through a catheter. It uses its shape memory properties to expand and block the blood vessel in the target area to achieve the purpose of treatment. According to the different ways of release, embolization coils can be divided into free type and detachable type.

[0003] Among them, the free type cannot be recovered once released, while the detachable type can be recovered or repositioned as needed after release, and adjusted multiple times in the catheter until the ideal position and effect are achieved. Therefore, the detachable spring coil has significant advantages in embolization accuracy and success rate.

[0004] Common methods of releasing detachable coils include mechanical, electronic and hydraulic release. Among them, electrolytic release requires complex electronic components and power supply support, while hydrolytic release requires a complex liquid circulation system. These release designs increase the failure rate and maintenance difficulty to a certain extent. Mechanical release devices are relatively simple. Through physical control, medical staff can operate more intuitively and accurately, reducing the uncertainty caused by electromagnetic interference or liquid flow, and improving the stability and success rate of surgery.

[0005] In order to mechanically release the embolic coil, people have developed various technologies and methods. After searching the literature of the prior art, it was found that CN 1024385833 B describes a mechanical interlocking connection delivery device for delivering embolic instruments, which includes a delivery guide wire and an embolic coil interlockingly connected, and an interlocking connection device can be operated to release the coil. When the delivery device is located in the target area, the delivery guide wire is pushed forward, prompting the interlocking connection device to push out the delivery catheter, so that the delivery guide wire and the embolic coil are separated from each other. CN 112274209B discloses a spring coil delivery and release system, which comprises: a spring coil, a developing code engraving and a delivery and release device; the developing code engraving is fixedly connected to the spring coil; the delivery and release device comprises an elastic balloon and a delivery tube; the distal end of the elastic balloon is accommodated in the developing code engraving, and the proximal end is bonded to the delivery tube; the delivery tube is connected to the inside of the elastic balloon to form a chamber for accommodating gas; the proximal end of the delivery tube is provided with an inflatable sealing component, and a breaking structure is provided at a position at a certain distance from the inflatable sealing component on one side of the proximal end; an external inflating device inflates the chamber through the inflatable sealing component; the spring coil and the developing code engraving are delivered to a target position through the inside of a microcatheter under the action of the elastic balloon and the delivery tube; the breaking structure is broken by an external force, the gas in the chamber leaks, the elastic balloon contracts, and escapes from the developing code engraving, so that the developing code engraving is separated from the elastic balloon, thereby releasing the spring coil and the developing code engraving from the delivery and release device. CN 110840509B discloses a spring coil double-guide wire release system, including a delivery guide wire and a release guide wire, the release system also includes a spring coil and a polymer plastic sleeve, the release guide wire passes through the release buckle at the proximal end of the spring coil and abuts against the polymer plastic sleeve, and the delivery guide wire abuts against the release buckle at the proximal end of the spring coil. Through the unique double-guide wire mechanical cooperation, only the release guide wire needs to be withdrawn during release, which reduces the difficulty of parts processing and assembly, and achieves more stable and efficient release.

[0006] In the above-mentioned technologies, the embolic coils released by mechanical means mostly adopt an incompletely controllable release method, that is, the coils will be released immediately after they completely leave the catheter. However, the existing fully controllable mechanical release coils mostly need to be used with complex release devices, which increases the clinical learning cost, affects the surgical efficiency and increases the release failure rate to a certain extent. Therefore, the development of an embolic coil system that is easy to release and fully controllable is conducive to improving the stability, accuracy and success rate of embolic treatment of vascular malformations such as aneurysms. Summary of the invention

[0007] The purpose of the present invention is to provide an embolic coil that is easy to release and fully controllable and a method of using the same, so as to solve the problem of how to design an embolic coil that improves the stability, accuracy and success rate of embolic treatment of vascular malformations such as aneurysms.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention provides an embolic spring coil that is easy to release and fully controllable, comprising an embolic spring coil, a delivery guide wire, an interlocking structure for connecting the embolic spring coil and the delivery guide wire, a release adjustment mechanism disposed in the delivery guide wire, and a release control wire connecting the release adjustment mechanism and the interlocking structure;

[0010] The interlocking structure comprises an interlocking structure I connected to the end of the embolic spring coil and an interlocking structure II connected to the end of the delivery guide wire;

[0011] One end of the release control wire after passing through the interlocking structure II is detachably connected to the interlocking structure I, and the release adjustment mechanism is used to disengage the release control wire from the interlocking structure I.

[0012] Furthermore, in this embodiment, the interlocking structure member I and the interlocking structure member II are interlocked via a coupling slot; a reserved hole is provided axially in the interlocking structure member II to facilitate the passage of the release control wire, and a closed spring piece for clamping the release control wire is provided in the interlocking structure member I.

[0013] This embodiment goes a step further, wherein the closing spring piece includes two adjacent arc-shaped pieces arranged on the interlocking structure I, a reserved gap is reserved between the two arc-shaped pieces to facilitate the passage of the release control wire, and a round head larger than the size of the reserved gap is provided at the end of the release control wire.

[0014] Further in this embodiment, the delivery guide wire includes a hollow section close to the interlocking structure II and a connecting section connected to the hollow section;

[0015] The release adjustment mechanism comprises a pressure-bearing hollow platform arranged in the hollow section, a connecting platform arranged in the connecting section, and a compression spring located between the pressure-bearing hollow platform and the connecting platform; a buckle I is arranged in the end of the hollow section, and a buckle II rotatably engaged with the buckle I is arranged at the end of the connecting section;

[0016] A through hole is axially opened in the pressure-bearing hollow platform to facilitate the passage of the release control wire, and one end of the release control wire away from the interlocking structure I is fixedly connected to the connecting platform.

[0017] Furthermore, in this embodiment, the interlocking structural member I and the interlocking structural member II are interlocked by a physical interlocking mechanism, and the two are interlocked by a toothed contact surface; the toothed contact surface is a regular geometric shape or an irregular geometric shape.

[0018] Furthermore, in this embodiment, the snap-fit ​​member I and the snap-fit ​​member II are interlocked through a snap-fit ​​mechanism, and the two are interlocked through a toothed contact surface; the toothed contact surface is a regular geometric shape or an irregular geometric shape.

[0019] In this embodiment, the diameter of the release control wire is in the range of 0.05 mm to 0.15 mm;

[0020] The release control wire is made of metal material, which includes but is not limited to a single metal material, an alloy material or a combination thereof; wherein the alloy material is at least one of nickel-based alloy, iron-based alloy, cobalt-based alloy, titanium-based alloy, copper-based alloy, aluminum-based alloy, zinc-based alloy and magnesium-based alloy.

[0021] The present invention also provides a method for using an embolic spring coil that is easy to release and fully controllable, comprising: delivering the embolic spring coil to a target position via a microcatheter so that the interlocking structure completely leaves the microcatheter; rotating the connecting section to drive the snap member I to rotate relative to the snap member II until the two are complementary in shape; automatically separating the connecting section from the hollow section by a predetermined distance through the elastic force of the compression spring component; and driving the release control wire to move via the connecting section so that the round end of the release control wire is separated from the closed spring sheet, thereby achieving separation of the interlocking structure I from the interlocking structure II.

[0022] Furthermore, in this embodiment, the compression spring component has a compressed state and a natural state; when the buckle I and the buckle II are locked, the compression spring component is in the compressed state.

[0023] Furthermore, in this embodiment, when the latch member I and the latch member II are rotated and unlocked, the compression spring component recovers from the compressed state to the natural state, and generates a driving force to separate the connecting section from the hollow section.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are:

[0025] When the spring coil in the present invention is delivered to the target site of the corresponding arterial malformation lesion such as an aneurysm by a common clinical method, its placement position can be flexibly adjusted before release, and the spring coil will not be released immediately after the release site completely leaves the delivery catheter, and the release is completely controllable; when released, the distal and proximal parts of the delivery guide wire are separated by physical means, so the spring coil can be released simply and quickly, providing a low-risk, highly efficient, controllable, economical and practical detachable spring coil option for clinical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 This is a front view of the structure of the present invention;

[0028] Figure 2 A schematic diagram of an interlocking structure according to a preferred embodiment;

[0029] Figure 3 It is a schematic diagram of the connection between the conveying guide wire connecting section and the hollow section;

[0030] Figure 4 It is a schematic diagram of the fastener, the connecting platform and the pressure-bearing hollow platform;

[0031] Figure 5 It is a schematic diagram of the connection between the delivery guide wire connection section and the hollow section during release;

[0032] Figure 6 It is a schematic diagram of the interlocking structural parts when released;

[0033] Figure 7 to Figure 10 It is a schematic diagram of interlocking structural parts of an optional embodiment;

[0034] Figure 11 to Figure 14 Schematic diagram of a snap fastener according to an optional embodiment.

[0035] Description of reference numerals:

[0036] 1. Embolization spring coil; 2. Interlocking structure; 21. Interlocking structure I; 211. Closing spring; 22. Interlocking structure II; 3. Release control wire; 4. Compression spring; 5. Delivery guide wire; 51. Connecting section; 511. Connecting platform; 512. Fastener II; 52. Hollow section; 521. Fastener I; 522. Pressure-bearing hollow platform. DETAILED DESCRIPTION

[0037] refer to Figure 1 This embodiment provides an embolic spring coil that is easy to release and fully controllable, including a spring coil 1, an interlocking structure 2, a release control wire 3, a compression spring 4 and a delivery guide wire 5.

[0038] refer to Figure 2 The interlocking structure 2 includes an interlocking structure Ⅰ21 and an interlocking structure Ⅱ22, wherein the interlocking structure Ⅰ21 is connected to the embolic spring coil 1, and the interlocking structure Ⅱ22 is connected to the delivery guide wire 5.

[0039] refer to Figure 3, the delivery guide wire 5 is composed of a hollow section 52 and a connecting section 51. A buckle II 512 and a connecting platform 511 are installed inside the connecting section 51 of the delivery guide wire 5. A buckle I 521 and a pressure-bearing hollow platform 522 are installed in the hollow section 52 of the delivery guide wire 5. A compression spring 4 is connected between the hollow section 52 and the connecting section 51. A circular hole is provided in the middle of the pressure-bearing hollow platform 522, which only allows the release control wire 3 to pass through. The connecting section 51 is connected to the buckle I 521 of the hollow section 52 of the delivery guide wire by a physical buckle through the buckle II 512. The compression spring 4 is connected to the connecting platform 511 of the connecting section 52.

[0040] refer to Figure 2 and Figure 3 The round end of the release control wire 3 is connected to the interlocking structure I21 by a physical snap-fit ​​method through a closed spring 211, and the proximal end is connected to the connecting platform 511 of the delivery guide wire connecting section. The release control wire 3 is located inside the delivery guide wire 5 and in the hollow axial area of ​​the compression spring 4.

[0041] When used in conjunction with a microcatheter, after the embolization spring coil 1 is delivered to the target position and the interlocking structure 2 completely leaves the delivery catheter, the connecting section 51 of the delivery guide wire 5 is rotated to drive the buckle II 512 to rotate relative to the buckle I 521. When the buckle II 512 rotates to a position where the shape of the buckle I 521 is complementary, the compression spring 4, which was originally in a compressed state, will be restored to a natural state through its elasticity, and the elastic force generated can realize the automatic push-off of the delivery guide wire connecting section 51 and the hollow section 52, so that the two form a predetermined distance. Under the pulling action of the delivery guide wire connecting section 52, the round head end of the release control wire 3 is separated from the closed spring piece 211, and is separated from the interlocking structure I 21. After losing the connection of the release control wire 3 and the restraining effect of the catheter, the interlocking structure I 21 and the interlocking structure II 22 are separated, and the embolization spring coil 1 is mechanically released.

[0042] refer to Figure 4 , the shapes and contact surface numbers of the snap fasteners Ⅰ521 and the snap fasteners Ⅱ512; the release control wire 3 has a diameter of 0.10 mm and is made of stainless steel.

[0043] In an optional embodiment, the interlocking structure 2 is shaped as follows: Figure 7-Figure 10 shown.

[0044] The shapes and contact surface numbers of the fasteners Ⅰ521 and Ⅱ512 are as follows: Figure 11-14 as shown.

[0045] In this embodiment, the diameter of the release control wire 3 is 0.05 mm and is made of nickel-titanium alloy.

[0046] In an optional embodiment, the interlocking structure 2 is shaped as follows: Figure 8 The shape and number of contact surfaces of the snap member 42 and the snap member 51 are as shown; Fig.12 As shown; the release control wire 3 has a diameter of 0.15mm and is made of stainless steel.

[0047] In an optional embodiment, the interlocking structure 2 is shaped as follows: Fig. 9 The shape and number of contact surfaces of the snap member 42 and the snap member 51 are as shown; Fig.13 As shown; the release control wire 3 has a diameter of 0.10 mm and is made of nickel-titanium alloy.

[0048] In an optional embodiment, the interlocking structure 2 is shaped as follows: Fig.10 The shape and number of contact surfaces of the snap member 42 and the snap member 51 are as shown; Fig.14 As shown; the release control wire 3 has a diameter of 0.10 mm and is made of stainless steel.

[0049] The above describes the various components of the spring coil delivery and release system provided by the embodiment of the present invention and the connection lines between them. Figure 1 to Figure 6 Introduce the working principle and process of the present invention

[0050] The present invention is used in conjunction with a microcatheter. After the embolic spring coil 1 is delivered to the target position and the interlocking structure 2 completely leaves the delivery catheter, the delivery guide wire connecting section 51 is rotated to drive the buckle II 512 to rotate relative to the buckle I 521. When the buckle II 512 rotates to a position where the buckle II 512 is complementary in shape to the buckle I 521, the compression spring 4, which was originally in a compressed state, will recover to a natural state through its elasticity, and the elastic force generated will act on the pressure-bearing hollow platform 522 to form a reaction force, which will act on the connecting platform 511, thereby realizing the automatic separation of the delivery guide wire connecting section 51 and the hollow section 52, so that the two form a predetermined distance, such as Figure 5 As shown. Under the pulling action of the connecting platform 511, the round end of the release control wire 3 is separated from the closing spring piece 211, and is separated from the interlocking structure part Ⅰ21, as shown. Figure 6 After the connection of the release control wire 3 and the restraining effect of the catheter are lost, the interlocking structure part I 21 and the interlocking structure part II 22 are separated, and the embolization spring coil 1 is mechanically released.

[0051] The embolic spring coil, which is easy to release and fully controllable, provided in an embodiment of the present invention is used in conjunction with a microcatheter. After the embolic spring coil is delivered to the target position and the interlocking structure completely leaves the delivery catheter, the operator can release the locking state of the proximal end and the hollow section of the delivery guide wire by a rotational action. After the locking state is released, the spring that was originally in a compressed state between the proximal end and the hollow section of the guide wire will return to a natural state through its elasticity, and the elastic force generated can automatically push the two parts apart, so that the two form a predetermined distance, so that the release control wire is pulled by the guide wire connecting section, and the round head end of the release control wire is separated from the closed spring sheet to achieve separation from the interlocking structure. After the release control wire connection and the catheter constraint are lost, the interlocking structure is separated and the embolic spring coil is mechanically released.

[0052] The above embodiments are only descriptions of the preferred methods of the invention, and are not intended to limit the scope of the invention. Without departing from the design spirit of the invention, various modifications and improvements made to the technical solutions of the invention by ordinary technicians in this field should fall within the protection scope of the claims of the invention.

Claims

1. An embolic coil that is easily released and fully controllable, characterized in that: It comprises an embolic spring coil (1), a delivery guide wire (5), an interlocking structure (2) for connecting the embolic spring coil (1) and the delivery guide wire (5), a release adjustment mechanism arranged in the delivery guide wire (5), and a release control wire (3) connecting the release adjustment mechanism and the interlocking structure (2); The interlocking structure (2) comprises an interlocking structure I (21) connected to the end of the embolic spring coil (1) and an interlocking structure II (22) connected to the end of the delivery guide wire (5); One end of the release control wire (3) after passing through the interlocking structure II (22) is detachably connected to the interlocking structure I (21), and the release adjustment mechanism is used to separate the release control wire (3) from the interlocking structure I (21).

2. The embolic spring coil with easy release and full controllability according to claim 1, characterized in that: The interlocking structure part I (21) and the interlocking structure part II (22) are interlocked via a coupling slot; a reserved hole is provided in the axial direction of the interlocking structure part II (22) to facilitate the passage of the release control wire (3); and a closing spring piece (211) for clamping the release control wire (3) is provided in the interlocking structure part I (21).

3. The embolic spring coil with easy release and full controllability according to claim 2, characterized in that: The closing spring piece (211) comprises two arc-shaped pieces arranged close to each other on the interlocking structure part I (21), a reserved gap is reserved between the two arc-shaped pieces to facilitate the passage of the release control wire (3), and a round head larger than the size of the reserved gap is arranged at the end of the release control wire (3).

4. The embolic coil with easy release and full controllability according to claim 1, characterized in that: The delivery guide wire (5) comprises a hollow section (52) close to the interlocking structure II (22) and a connecting section (51) connected to the hollow section; The release adjustment mechanism comprises a pressure-bearing hollow platform (522) arranged in the hollow section (52), a connecting platform (511) arranged in the connecting section (51), and a compression spring (4) located between the pressure-bearing hollow platform (522) and the connecting platform (511); a buckle part I (521) is arranged in the end of the hollow section (52), and a buckle part II (512) rotatably engaged with the buckle part I (521) is arranged at the end of the connecting section (51); A through hole is axially opened in the pressure-bearing hollow platform (522) to facilitate the passage of the release control wire (3), and one end of the release control wire (3) away from the interlocking structure part I (21) is fixedly connected to the connecting platform (511).

5. The embolic spring coil with easy release and full controllability according to claim 1, characterized in that: The interlocking structure part I (21) and the interlocking structure part II (22) are interlocked through a physical interlocking mechanism, and the two are interlocked through a toothed contact surface; the toothed contact surface is a regular geometric shape or an irregular geometric shape.

6. The embolic spring coil with easy release and full controllability according to claim 1, characterized in that: The snap-fit ​​member I (521) and the snap-fit ​​member II (512) are interlocked through a snap-fit ​​mechanism, and the two are interlocked through a toothed contact surface; the toothed contact surface is a regular geometric shape or an irregular geometric shape.

7. The embolic spring coil with easy release and full controllability according to claim 1, characterized in that: The diameter of the release control wire (3) is in the range of 0.05 mm to 0.15 mm; The release control wire (3) is made of a metal material, which includes but is not limited to a single metal material, an alloy material or a combination thereof; wherein the alloy material is at least one of a nickel-based alloy, an iron-based alloy, a cobalt-based alloy, a titanium-based alloy, a copper-based alloy, an aluminum-based alloy, a zinc-based alloy and a magnesium-based alloy.

8. A method for using an embolic spring coil that is easily released and fully controllable, according to any one of claims 1 to 7, characterized in that: The embolic spring coil (1) is delivered to the target position through the microcatheter, so that the interlocking structure (2) completely leaves the microcatheter; the connecting section (51) is rotated to drive the buckle part I (521) to rotate relative to the buckle part II (512) until the two shapes complement each other; through the elastic force of the compression spring component (4), the connecting section (51) and the hollow section (52) are automatically separated by a predetermined distance; and the release control wire (3) is driven to move through the connecting section (51), so that the round end of the release control wire (3) is separated from the closing spring sheet (211), thereby realizing the separation of the interlocking structure I (21) and the interlocking structure II (22).

9. The method for using the embolic spring coil with easy release and full controllability according to claim 8, characterized in that: The compression spring component (4) has a compression state and a natural state; when the buckle part I (521) is locked with the buckle part II (512), the compression spring component (4) is in the compression state.

10. The method for using the embolic spring coil with easy release and full controllability according to claim 9, characterized in that: When the latch member I (521) and the latch member II (512) are rotated and unlocked, the compression spring component (4) recovers from the compressed state to the natural state and generates a driving force to separate the connecting section (51) from the hollow section (52).

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