Spring ring release system

Abstract

The invention provides a spring ring releasing system, and belongs to the technical field of medical instruments. The system comprises a spring ring, a pushing component and a conveying sheath tube, wherein the far end of the pushing component is detachably connected with the near end of the spring ring; the conveying sheath tube is used for accommodating a spring ring and conveying the spring ring to a target position; a cut-off component is arranged on the end face of the far end of the conveying sheathing canal, the cut-off component is in sliding fit with the end face of the far end of the conveying sheathing canal, a traction component is arranged on the cut-off component, one end of the traction component is fixedly connected with the cut-off component, the other end of the traction component extends to the near end in the axial direction of the conveying sheathing canal, and the traction component is pulled from the near end. The driving component is used for driving the cut-off component to move from one side to the other side of the conveying sheath tube cavity to cut off the spring ring; the slidable cut-off component is arranged at the far end of the conveying sheath tube, controllable cut-off of the spring ring is achieved, and the technical problem that in the prior art, the filling length of the spring ring cannot be flexibly adjusted in the last stage of an aneurysm embolism operation is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a spring coil release system. BACKGROUND

[0002] At present, in the treatment of aneurysm, especially cerebral aneurysm, an interventional embolization is usually adopted, that is, a spring coil is delivered into an aneurysm cavity through a microcatheter for filling, so as to promote thrombosis and achieve the purpose of occluding the aneurysm. During the operation, a plurality of spring coils usually need to be released into the aneurysm cavity in sequence to achieve dense packing of the aneurysm cavity.

[0003] In the implantation process of the spring coil, the controllable release of the implanted part is a key operation link. There are various release methods in the prior art, including electrolytic release and mechanical release. For example, a Chinese patent application for invention with the document number CN112274209A discloses a spring coil delivery and release system, which adopts a gas release method to realize the separation of the spring coil and the delivery device through the cooperation of an elastic balloon, a gas sealing component and a fracture structure. The system can effectively avoid the position deviation of the implant caused by stress during mechanical release, and improves the safety and stability of the operation.

[0004] However, in actual clinical operation, especially when a plurality of spring coils need to be implanted for step-by-step packing, the existing system still has significant deficiencies. For example, when releasing the last spring coil, the doctor often faces a dilemma: if the spring coil is completely filled to achieve dense embolization, the pressure in the aneurysm cavity may suddenly increase due to overfilling, and even the aneurysm wall may be ruptured, which poses a serious risk to the operation; if the last spring coil is abandoned to avoid rupture, it will lead to insufficient packing of the aneurysm, affecting the embolization effect and increasing the risk of postoperative recurrence.

[0005] Therefore, the prior art lacks a release system that can adjust or cut off the length of the spring coil at the end of the filling period, which can not only achieve reliable release, but also flexibly adjust the length of the implanted spring coil according to the space of the aneurysm cavity, so as to improve the adaptability, safety and treatment effect of the operation. SUMMARY

[0006] The purpose of the present application is to provide a spring coil release system, which realizes controllable cutting of the spring coil by setting a slidable cutting component at the distal end of the delivery sheath tube, so as to solve the technical problems that the length of the spring coil cannot be flexibly adjusted at the end of the aneurysm embolization operation in the prior art, resulting in insufficient packing or aneurysm rupture.

[0007] In order to achieve the above-mentioned purpose, the spring coil release system of the present application provides the following technical solutions: A spring coil release system, comprising: spring ring; a pushing component, a distal end of the pushing component being detachably connected with a proximal end of the spring ring; a delivery sheath tube, the delivery sheath tube being used for accommodating the spring ring and delivering the spring ring to a target position; an end face of a distal end of the delivery sheath tube is provided with a cutting-off component, the cutting-off component being in sliding fit with the end face of the distal end of the delivery sheath tube, and the cutting-off component is provided with a pulling component, one end of the pulling component being fixedly connected with the cutting-off component, and the other end of the pulling component extending to a proximal end along an axial direction of the delivery sheath tube, the pulling component being pulled from the proximal end to drive the cutting-off component to move from one side to the other side of a lumen of the delivery sheath tube to cut off the spring ring.

[0008] As a further optimized technical solution, an accommodating cavity for accommodating the cutting-off component is arranged on an opposite side of the cutting-off component on the end face of the distal end of the delivery sheath tube, and a thickness of the accommodating cavity is matched with a thickness of the cutting-off component.

[0009] As a further optimized technical solution, the cutting-off component is in a sheet structure, and a first blade edge structure is arranged on a side of the cutting-off component facing the lumen of the delivery sheath tube, and a second blade edge structure is arranged on a top wall of the accommodating cavity and faces the first blade edge structure.

[0010] As a further optimized technical solution, sliding components are arranged in parallel on both sides of the lumen on the end face of the delivery sheath tube, and both ends of the cutting-off component are in sliding fit with one of the sliding components.

[0011] As a further optimized technical solution, the sliding component is in a channel structure with an arc-shaped cross section, and both ends of the cutting-off component are respectively provided with a limiting block matched with the channel structure.

[0012] As a further optimized technical solution, the pulling component is two pulling wires, one end of each of the pulling wires is fixedly connected with one of the limiting blocks, and the other end of each of the pulling wires extends to the proximal end along the axial direction of the delivery sheath tube.

[0013] As a further optimized technical solution, a sliding cavity is arranged on a side wall of the delivery sheath tube in an axial direction for the pulling wires to extend.

[0014] As a further optimized technical solution, the cutting-off component is in an integral blade structure.

[0015] As a further optimized technical solution, the cutting-off component has two hingedly connected first and second shearing blades, and after the cutting-off component moves to one side of the accommodating cavity, the first and second shearing blades are close to each other to shear the spring ring.

[0016] As a further optimization technical solution, the gap is arranged between the sliding component and the accommodating cavity for the end of the cutting component to separate from the sliding component, and the two ends of the cutting component are close to each other after separating from the sliding component to make the first shearing blade close to the second shearing blade.

[0017] Beneficial effects: The present application sets the controllable sliding cutting component at the distal end of the delivery sheath, so that the operator can accurately cut the excess part of the spring coil after the spring coil is delivered to the target position according to the remaining space of the aneurysm cavity. Thus, the "on-demand cutting" type implantation is realized, which not only avoids the risk of overfilling and bursting the aneurysm due to the excess length of the spring coil, but also ensures that the aneurysm cavity can be fully and densely packed, thereby effectively improving the safety, adaptability and treatment effect of the interventional embolization surgery. At the same time, the entire cutting operation is controlled by the proximal traction, which is convenient and intuitive, and the cutting process does not disturb the implanted part.

[0018] Further, the sliding component extends along the sliding channel of the side wall of the delivery sheath to the proximal end, so that additional surgical channels are not required during operation, which is in line with the operation habits of existing interventional surgeries.

[0019] Further, the movement of the cutting component is guided by the sliding component, and the accommodating cavity limits the final position of the cutting component, ensuring that the cutting action is only completed at the distal end face of the delivery sheath, and will not cause scratching or damage to the surrounding blood vessel wall, aneurysm wall and other fragile tissues, thereby significantly reducing the risk of surgery. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of this application serve to provide a further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation of the present application. Among them: Figure 1 It is a whole structure schematic diagram of the spring coil release system embodiment 1 of the present application; Figure 2 It is a distal end face schematic diagram of the delivery sheath of the spring coil release system embodiment 1 of the present application; Figure 3 It is a Figure 2 schematic diagram of the bottom view; Figure 4 It is a spring coil cutting schematic diagram of the spring coil release system embodiment 1 of the present application; Figure 5 It is a distal end structure schematic diagram of the delivery sheath of the spring coil release system embodiment 2 of the present application; Figure 6 It is a distal end face schematic diagram of the delivery sheath of the spring coil release system embodiment 2 of the present application; Figure 7 It is a cutting component working state schematic diagram of the spring coil release system embodiment 2 of the present application.

[0021] In the figure: 100, spring ring; 200, pushing part; 300, delivery sheath; 310, sliding channel; 400a and 400b, cutting part (400a is the cutting part in the first embodiment, and 400b is the cutting part in the second embodiment); 410, first blade structure; 420, limiting block; 430, first shearing blade; 440, second shearing blade; 500, pulling part; 600, containing cavity; 610, top wall; 620, side wall; 611, second blade structure; 700, sliding part; 800, gap. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0023] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and are not required to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "connected", "connected" used in the present application should be understood broadly, for example, can be fixed connection, can also be detachable connection; can be directly connected, can also be indirectly connected through intermediate components, and those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. In addition, the term "proximal end" refers to the end close to the operator, and the term "distal end" refers to the end away from the operator.

[0024] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] The shapes and sizes of the components in the drawings do not reflect the true proportions of the product, but only serve to illustrate the content of the present application.

[0026] This invention provides a coil release system, primarily addressing the technical problems of "overfilling leading to rupture" or "underfilling leading to recurrence" during aneurysm embolization due to the inability to adjust the length of implanted coils. This system features structural improvements over traditional coils, delivery components, and delivery sheaths. Specifically, a proximal-controlled mechanical cutting mechanism is integrated into the distal end face of the delivery sheath 300. This mechanism mainly includes sliding or movable cutting components 400a and 400b, and a connected traction component 500. During surgery, after the last coil in a set is pushed to the target aneurysm location via the delivery sheath 300, if the surgeon determines that the current length of the coil 100 may exceed the safe volume of the aneurysm cavity, the traction component 500 can be operated proximally. This operation drives the distal cutting components 400a and 400b to perform a specific action, thereby directly cutting off the excess portion of the coil 100 on-site, achieving precise "on-demand trimming" implantation.

[0027] Specifically, this invention provides two design schemes: The first design adopts an integrated sliding blade structure. The cutting component 400a is a single, flat blade, which is embedded in the sliding component 700 on the end face of the delivery sheath 300 via limiting blocks 420 on both sides. One side of the blade has a first cutting edge structure 410, and the corresponding end face of the delivery sheath 300 has a receiving cavity 600 with a second cutting edge structure 611. When the traction component 500 is pulled from the proximal end, the driving blade slides rapidly along the sliding component 700 into the receiving cavity 600. During this process, the spring coil 100 located between the blade and the top wall of the receiving cavity 600 is cut by the coordinated shearing of the two cutting edges (similar to the principle of a guillotine). This design is simple in structure, direct in action, and has high cutting efficiency.

[0028] The second design adopts a hinged scissor structure. The cutting component 400b itself consists of two shearing blades, a first shearing blade 430 and a second shearing blade 440, connected by a hinge shaft. Initially, both blades are open. Both ends of the cutting component 400 are also engaged with the sliding component 700 via limiting blocks 420. The sliding component 700 has a gap 800 at its end. When the traction component 500 pulls the cutting component 400b to the end of the sliding component 700, the limiting blocks 420 at both ends of the cutting component 400b disengage from the track and fall into the gap 800, losing lateral constraint. Under the continuous action of the traction force, the ends of the two shearing blades approach each other, causing the cutting edge to perform a closing motion like scissors, thereby cutting the spring coil 100 located between the cutting edges.

[0029] Example 1 like Figures 1-4 As shown, the spring coil release system includes a spring coil 100, a pushing component 200, a delivery sheath 300, a cutting component 400a, and a traction component 500.

[0030] The spring coil 100 is a common medical embolism spring coil made of platinum-tungsten alloy material, has good biocompatibility and plasticity, and is used for filling the aneurysm cavity of an aneurysm.

[0031] The pushing component 200 is a pushing rod, the distal end of which is connected to the proximal end of the spring coil 100 in a detachable manner such as mechanical clamping or electrolytic connection, facilitating the release of the spring coil 100, and the proximal end extends out of the body, facilitating the doctor to control the pushing of the spring coil 100 in the delivery sheath tube 300.

[0032] The delivery sheath tube 300 is a common microcatheter made of medical polymer material and metal braided structure for delivery, the lumen diameter of which is matched with the diameter of the spring coil 100, and is used for accommodating and delivering the spring coil 100 to the target position of the aneurysm. Two parallel sliding cavities 310 are arranged on the side wall of the delivery sheath tube 300 in the axial direction, and the sliding cavities 310 are independent of the lumen of the delivery sheath tube 300, avoiding interference with the delivery of the spring coil 100.

[0033] The cutting component 400a is an integral blade structure in the form of a sheet, and a first blade edge structure 410 is arranged on the side facing the lumen of the delivery sheath tube 300. The first blade edge structure 410 is a sharp bevel structure for cutting the spring coil 100. Preferably, the first blade edge structure 410 is in the form of an outwardly convex arc shape. Two limiting blocks 420 are arranged at the two ends of the cutting component 400a, respectively. The cross section of the limiting block 420 is arc-shaped, and the thickness dimension of the connecting component of the limiting block 420 and the cutting component 400a is smaller than the overall thickness dimension of the cutting component 400a, facilitating the cooperation of the limiting block 420 with the sliding component to be described below.

[0034] On the end face of the distal end of the delivery sheath tube 300, two sliding components 700 are arranged in parallel on both sides of the lumen. In this embodiment, the sliding component 700 is an arc-shaped channel structure with a cross section matched with the limiting block 420. The limiting block 420 of the cutting component 400a is embedded in the sliding component 700, facilitating the sliding cooperation with the end face of the distal end of the delivery sheath tube 300, and in the sliding process, the limiting block 420 is used to limit the stable sliding of the cutting component 400a along the sliding component 700.

[0035] An accommodation cavity 600 for accommodating the cutting member 400a is arranged on the end face of the distal end of the delivery sheath 300, on the side opposite to the cutting member 400a. In the embodiment, the accommodation cavity 600 and the initial position of the cutting member 400a are arranged near the two ends of the sliding member 700 respectively, and the accommodation cavity 600 is enclosed by a top wall 610 and a side wall 620, wherein the top wall 610 is arranged in parallel with the end face of the distal end of the delivery sheath 300, the side wall 620 is perpendicular to the end face of the distal end of the delivery sheath 300, and the distance between the top wall 610 and the end face of the distal end of the delivery sheath 300 is the thickness of the accommodation cavity. In the embodiment, the thickness of the accommodation cavity 600 is matched with the thickness of the cutting member 400a, so that the cutting member 400a in the moving position can be accommodated. The cutting member 400a after moving avoids scratching or damaging the fragile tissues such as the wall of the surrounding blood vessel and the wall of the aneurysm, so as to reduce the risk of the operation.

[0036] Preferably, a second blade structure 611 is arranged on the top wall 610 of the accommodation cavity 600, and the second blade structure 611 faces the first blade structure 410. When the cutting member 400a moves to the accommodation cavity 600, the first blade structure 410 and the second blade structure 611 cooperate with each other to form a shearing surface, so as to realize the shearing cutting of the spring coil 100.

[0037] One end of the traction member 500 is fixedly connected with the limiting block 420 of the cutting member 400a, and the other end extends to the proximal end along the sliding lumen 310 of the delivery sheath 300. The traction member 500 is pulled from the proximal end, so as to drive the cutting member 400a to move from one side to the other side of the lumen of the delivery sheath 300 to cut the spring coil 100. In the embodiment, the traction member 500 is two medical stainless steel traction wires. One end of each traction wire is fixedly connected with the limiting block 420 at the two ends of the cutting member 400a respectively, and the other end extends to the proximal end along the sliding lumen 310 of the side wall of the delivery sheath 300 in the axial direction of the delivery sheath 300 and is exposed outside the body.

[0038] In the embodiment, each sliding lumen 310 is arranged near one sliding member 700 respectively, and each traction member 500 is arranged along the sliding lumen 310 near the sliding member. In this way, when the sliding lumen 310 and the sliding member 700 are arranged close to each other, the force direction of the traction wire can be highly consistent with the sliding direction of the cutting member 400a (along the sliding member), so as to reduce the bending and deviation of the traction wire due to the large span, avoid the problems of the cutting member jamming and deviation caused by the included angle between the traction direction and the sliding direction, and ensure that the cutting member can move smoothly along the sliding member when the traction wire is pulled, so as to realize the cutting action accurately.

[0039] In practical use, all spring coils 100 are first sequentially filled into the aneurysm along the lumen of the sheath 300. When filling the last one, if it is observed that the aneurysm lumen is about to be filled and continuing to push may cause excessive pressure, the pushing is stopped. The doctor simultaneously pulls two traction wires from the proximal end, driving the cutting component 400a to move along the sliding component 700 towards the receiving cavity 600. When the cutting component 400a moves to the receiving cavity 600, the first cutting edge structure 410 and the second cutting edge structure 611 cooperate to cut and sever the spring coils 100, achieving partial release of the spring coils 100. After the cutting is completed, the pushing component 200 is manipulated to remove the remaining spring coils 100 from the body, completing the surgery.

[0040] Example 2 like Figures 5-7 As shown, the difference between this embodiment and Embodiment 1 is that the structure of the cutting component is different. In this embodiment, the cutting component adopts a hinged shearing blade structure.

[0041] The specific cutting component 400b includes two hinged first shear blades 430 and second shear blades 440, with the hinge point of the two located in the middle of the cutting component 400b. The free ends of the first shear blades 430 and the second shear blades 440 are respectively provided with limiting blocks 420 adapted to the sliding component 700.

[0042] A gap 800 is provided between the sliding member 700 and the receiving cavity 600. The width of the gap 800 is greater than the thickness of the limiting block 420, which is used to allow the end of the cutting member 400b to disengage from the sliding member 700.

[0043] In the embodiment, in order to facilitate the mutual shearing of the first shearing blade 430 and the second shearing blade 440, the sliding cavity 310 is provided with one, and the sliding cavity 310 is arranged at a position between the two sliding members 700. In this way, the single sliding cavity 310 enables the two traction wires to pass out of the same cavity, and the tension points are located between the two sliding members 700, so that the symmetric and balanced tension can be applied to the limiting blocks 420 of the two shearing blades, the tension imbalance caused by the too large distance between the two cavities is avoided, the first shearing blade 430 and the second shearing blade 440 are synchronously closed, the shearing stability is improved, and the spring ring 100 is prevented from slipping or being incompletely cut off. At the same time, compared with the design of two cavities, the single middle cavity can reduce the occupation of the internal space of the side wall of the delivery sheath, and the cavity position does not need to be reserved on both sides of the sheath, so that the effective inner diameter of the sheath lumen can be ensured (without affecting the spring ring delivery), the overall outer diameter of the sheath can be reduced, the interventional operation of the fine diameter blood vessel is more suitable, and the risk of blood vessel injury is reduced. In addition, the closing action of the hinged shearing blade presents a symmetric rotation trend, the tension direction of the middle cavity is more consistent with the movement track of the shearing blade, the friction resistance between the traction wire and the cavity wall is reduced, the doctor's proximal control is more labor-saving and smooth, and the scene in which the cutting time needs to be finely adjusted during the operation is especially suitable.

[0044] The working process of the embodiment is as follows: the doctor synchronously pulls the two traction wires from the proximal end, drives the cutting part 400b to move along the sliding part 700 to the accommodation cavity 600, when the two ends of the cutting part 400b move to the gap 800, the limiting block 420 is separated from the sliding part 700, under the action of the tension of the traction wire, the two ends of the cutting part 400b approach each other, the free ends of the first shearing blade 430 and the second shearing blade 440 approach each other, and the shearing and cutting of the spring ring 100 are realized.

[0045] In summary, the spring ring release system provided by the application realizes the controllable cutting of the spring ring by arranging the slidable cutting part at the distal end of the delivery sheath and cooperating with the proximal control of the traction part, solves the problem that the length of the spring ring cannot be flexibly adjusted at the end of the aneurysm embolization operation, effectively reduces the risk of aneurysm rupture while ensuring that the aneurysm is fully packed, and improves the safety and treatment effect of the operation.

[0046] It can be understood that the above description is only exemplary, and the embodiments of the application are not limited in this regard.

[0047] The above is only a preferred embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application is within the protection scope of the application.

Claims

1. A spring ring release system characterized by, The utility model relates to a kind of spring ring and its delivery device, including: Spring ring (100); Push component (200), the distal end of the push component (200) is detachably connected with the proximal end of spring ring (100); Delivery sheath tube (300), the delivery sheath tube (300) is used to accommodate spring ring (100), and is used to deliver spring ring (100) to target position; End face on the distal end of the delivery sheath tube (300) is provided with truncation component (400a, 400b), the truncation component (400a, 400b) is slidably connected with the end face on the distal end of delivery sheath tube (300), and truncation component (400a, 400b) is provided with traction component (500), one end of traction component (500) is fixedly connected with truncation component (400a, 400b), and the other end extends to proximal end along the axial direction of delivery sheath tube (300), and the proximal end is pulled to traction component (500), for driving truncation component (400a, 400b) from the one side of the lumen of delivery sheath tube (300) to the other side to cut off spring ring (100).

2. The spring release system of claim 1, wherein, End face on the distal end of the delivery sheath tube (300) is provided with accommodation cavity (600) for accommodating truncation component (400a, 400b) on the side opposite to truncation component (400a, 400b), and the thickness of the accommodation cavity (600) is matched with the thickness of truncation component (400a, 400b).

3. The spring coil release system of claim 2, wherein, The truncation component (400a, 400b) is sheet structure, and the side of truncation component (400a, 400b) towards the lumen of delivery sheath tube (300) has first blade edge structure (410), and the top wall (610) of the accommodation cavity (600) is provided with second blade edge structure (611) towards the first blade edge structure (410).

4. The spring release system of claim 2, wherein, The end face of the delivery sheath tube (300) is provided with sliding component (700) on both sides of lumen in parallel, and both ends of the truncation component (400a, 400b) are slidably connected with one of the sliding component (700).

5. The spring coil release system of claim 4, wherein, The sliding component (700) is channel structure with arc-shaped cross section, and both ends of the truncation component (400a, 400b) have limiting block (420) matched with the channel structure.

6. The spring coil release system of claim 5, wherein, The traction component (500) is two traction wires, and one end of each of the traction wires is fixedly connected with one of the limiting block (420), and the other end extends to proximal end along the axial direction of delivery sheath tube (300).

7. The spring coil release system of claim 6, wherein, The side wall of the delivery sheath tube (300) is arranged with sliding cavity (310) for traction wire extension along the axial direction.

8. The coil release system according to any one of claims 1-7, wherein, The truncation component (400a) is one-piece blade structure.

9. The coil release system according to any one of claims 4-7, wherein, The truncation component (400b) has two hingedly connected first shear blade (430) and second shear blade (440), and after the truncation component (400b) moves to one side of the accommodation cavity (600), the first shear blade (430) and the second shear blade (440) are close to each other to shear spring ring (100).

10. The spring coil release system of claim 9, wherein, The sliding part (700) and the accommodating cavity (600) are provided with a gap (800) for the end of the cutting part (400b) to be separated from the sliding part (700), and after the two ends of the cutting part (400a, 400b) are separated from the sliding part (700), the two ends are close to each other so that the first shearing blade (430) and the second shearing blade (440) are close to each other.

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