Support conveyor facilitating support positioning
By setting development components and limiting parts at the distal end of the push wire of the stent conveyor, the problem of inaccurate position after the stent is released is solved, and the effect of the stent fully covering the lesion position is achieved, reducing the difficulty of operation and improving the accuracy.
Patent Information
- Application Number
- CN202421482436.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In stent interventional surgery, it is difficult for the prior art to accurately determine the position of the stent after release, resulting in the stent failing to fully cover the lesion position and the operation is difficult.
A stent conveyor is designed to facilitate positioning of the bracket. By setting a developing assembly and a limiting member at the distal end of the push wire, the length of the development assembly is smaller than the length of the bracket. When the bracket is in the press-hold state, there is a first preset distance between the development assembly and the distal end of the bracket to ensure that the released stent can completely cover the lesion position.
Through this technical solution, the operator does not need to rely on experience to visually measure the position of the stent, but only needs to ensure that the developing assembly covers the lesion position, which significantly reduces the difficulty of operation and improves the accuracy of the release of the stent.
Smart Images
Figure CN222899406U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a stent delivery device facilitating stent positioning. Background Art
[0002] Stent interventional surgery usually refers to a minimally invasive treatment method that, under the guidance of medical imaging, uses vascular puncture technology to deliver a stent to the site in the body that needs treatment (such as coronary arteries, peripheral arteries, carotid arteries, veins, intracranial arteries, etc.) through a catheter, and releases the stent to improve the structural function of the diseased location.
[0003] In the treatment of intracranial vascular diseases, the stent system consists of a stent and a delivery device. The delivery device includes a pusher wire and an introducer sheath. The stent is introduced into a microcatheter through the introducer sheath, and then the stent is pushed to the distal end of the microcatheter with the pusher wire in the microcatheter. Finally, the microcatheter is slowly withdrawn, so that the stent is pushed out of the microcatheter and released at the blood vessel lesion.
[0004] Both the distal end of the delivery device and the stent are provided with imaging components for determining the positions of the delivery device and the stent under X-rays during the operation. During the operation, the doctor first performs angiography to clarify the position and length A of the lesion. Since the stent needs to completely cover the lesion, generally at least a distance B (slightly different for different diseases, about 3 - 5 mm) needs to be reserved at both ends. Therefore, the doctor selects a stent with a nominal length longer than A + 2B for implantation.
[0005] When the stent is released, the distal end of the stent is first released and fixed to the blood vessel wall. Since the stent has shortening, that is, the stent in the compressed state is longer than the released stent, it is impossible to visually judge whether the released stent can completely cover the diseased location based on the imaging components of the stent in the compressed state.
[0006] Secondly, when releasing the stent during the operation, the distal end of the stent needs to be released after crossing a certain length of the diseased location. This length is ideally the distance B. However, on the one hand, only the imaging points at both ends of the stent have imaging properties. On the other hand, the blood vessel network is three-dimensional, and the angiography seen by the doctor is planar, and there is no scale in the angiography image. The operator can only visually estimate the position where the stent should be when estimating the distance B, which requires high experience of the operator and is difficult.
[0007] Therefore, an improved technical solution is needed to address the deficiencies of the above-mentioned existing technologies. Summary of the Invention
[0008] The purpose of the utility model is to provide a stent delivery device facilitating stent positioning, which can accurately judge the position of the released stent when placing the stent, thereby helping the released stent to align and completely cover the diseased location, so as to solve the problem that the stent does not cover the lesion due to inaccurate release position.
[0009] To achieve the above object, the present utility model provides the following technical solutions:
[0010] A stent delivery device facilitating stent positioning, comprising a pushing wire for pushing a vascular stent. A developing component is provided at the distal end of the pushing wire, and a limiting member is also provided at the distal end of the pushing wire. The pushing wire and the vascular stent are detachably connected through the limiting member. The length of the developing component is less than the length of the vascular stent. The vascular stent has a compressed state and an expanded state. When the vascular stent is in the compressed state, there is a first preset distance between the developing component and the distal end of the vascular stent.
[0011] Preferably, the first preset distance is 3 - 5 mm.
[0012] Preferably, when the vascular stent is in the expanded state, defining its length as L, then:
[0013] L = S + 2d,
[0014] wherein, S is the length of the developing component, and d is the first preset distance.
[0015] Preferably, the limiting member is snap - connected to the proximal end of the vascular stent.
[0016] Preferably, a support spring is provided between the pushing wire and the vascular stent, and the support spring is used to abut against the proximal end of the vascular stent and provide a thrust force.
[0017] Preferably, the limiting member protrudes from the surface of the pushing wire, and an inverted buckle is provided at the proximal end of the vascular stent, and the shape of the inverted buckle is adapted to the limiting member.
[0018] Preferably, the developing component is a flexible developing component.
[0019] Preferably, the developing component is continuous developing or discontinuous developing.
[0020] Preferably, the developing component is a single continuous developing spring, or the developing component is composed of several discontinuous developing springs.
[0021] Preferably, the developing component is a single continuous developing tube, or the developing component is composed of several discontinuous developing tubes.
[0022] Advantageous effects:
[0023] (1) The present utility model arranges the imaging component for pushing the wire inside the bracket in the pressed state. The center of the imaging component corresponds to the center of the bracket in the released state, and the length of the imaging component is adjusted. Its length is equal to the length of the bracket in the expanded state minus the preset distance at both ends of the bracket. During treatment, only by covering the lesion location with the imaging component for pushing the wire can it be ensured that the vascular stent after release completely covers the lesion location, and the distances between both ends of the stent and both ends of the lesion are not less than the preset distance;
[0024] (2) When releasing the vascular stent, the operator does not need to visually estimate and adjust the distal position of the vascular stent by experience. Only by ensuring that the imaging component for pushing the wire completely covers the lesion location can the operation difficulty be greatly reduced;
[0025] (3) The imaging component is made of a flexible material to facilitate passing along the microcatheter through the curved blood vessel to reach the lesion location. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:
[0027] Figure 1 is a schematic diagram of a vascular stent before being released from a microcatheter in the prior art.
[0028] Figure 2 is a schematic diagram of the shortening of a vascular stent after being released from a microcatheter in the prior art.
[0029] Figure 3 is a structural diagram of the distal end of the stent delivery device provided in Embodiment 1 of the present utility model.
[0030] Figure 4 is a structural diagram of the proximal end of the stent delivery device provided in Embodiment 1 of the present utility model.
[0031] Figure 5 is Figure 3 the enlarged view at A in
[0032] Figure 6 is Figure 3 the enlarged view at B in
[0033] Figure 7 is a schematic diagram of the imaging component being a continuous imaging spring in Embodiment 1 of the present utility model.
[0034] Figure 8 is a schematic diagram of the imaging component being an imaging tube in Embodiment 2 of the present utility model.
[0035] Figure 9 is a schematic diagram of the imaging component in Embodiment 4 of the present utility model.
[0036] Figure 10 This is a schematic diagram of the developing component in Embodiment 5 of the present utility model.
[0037] In the figure: 100, microcatheter; 200, pusher wire; 300, developing component; 400, vascular stent; 201, limiting member; 202, support spring; 301, first developing spring; 302, second developing spring. Detailed implementation manners
[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.
[0039] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.
[0040] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, or a detachable connection or an inseparable connection, or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication, indirect communication or the interaction relationship between two elements of two elements.
[0043] In the description of the present invention, the "proximal end" refers to the end close to the operator, and the "distal end" refers to the end far from the operator. For the convenience of understanding, without special instructions, the right side in the attached drawings of the specification of the present invention is the "distal end" direction, and the left side is the "proximal end" direction.
[0044] The following will describe the present utility model in detail with reference to embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.
[0045] In view of the problem that when the current vascular stent 400 is released, the operator needs to visually estimate the position where the stent should be when the reserved distance B at both ends of the stent is required, which has a high requirement for the operator's experience and affects the release accuracy, the present utility model provides a stent delivery device convenient for stent positioning, including a push wire 200, and the push wire 200 is used to push the vascular stent 400. As Figures 3 to 5 shown, a developing component 300 is provided at the distal end of the push wire 200, a limiting member 201 is also provided at the distal end of the push wire 200, the push wire 200 and the vascular stent 400 are detachably connected through the limiting member 201, the length of the developing component 300 is less than the length of the vascular stent 400, and the vascular stent 400 has a crimped state and an expanded state. When the vascular stent 400 is in the crimped state, there is a first preset distance between the developing component 300 and the distal end of the vascular stent 400.
[0046] Before use, the vascular stent 400 and the push wire 200 are loaded into the lumen of the introducer sheath. After connecting the introducer sheath with the microcatheter 100, the vascular stent 400 can be pushed into the microcatheter 100 through the push wire 200.
[0047] In a preferred embodiment of the present invention, the first preset distance is 3 - 5 mm, such as 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, and can be set to different values according to the type of lesion. For example, for atherosclerotic lesions, it can be set to 3 mm.
[0048] In the present invention, when the vascular stent 400 is in the expanded state, its length is defined as L, then:
[0049] L = S + 2d,
[0050] wherein, S is the length of the developing component 300, d is the first preset distance, and the first preset distance is the length to be reserved.
[0051] As Figure 3As shown in the figure, when the stent changes from the compressed state to the expanded state, "shortening" occurs, resulting in a shorter length. Since the distal end of the vascular stent 400 adheres to the wall and is fixed first during release, and the proximal end is gradually released as the sheath is withdrawn, the "shortening" is mainly manifested as the proximal end of the vascular stent 400 gradually displacing distally during the release process. And since the position of the push wire 200 remains unchanged when the vascular stent 400 is released, the distal positions of the push wire 200 and the vascular stent 400 are relatively stationary before and after release. Subsequently, the distance between the distal end of the imaging component 300 and the distal end of the vascular stent 400 is maintained at the first preset distance d. Therefore, in the present invention, to solve the release accuracy problem, it is defined that the distal end of the imaging component 300 and the distal end of the vascular stent 400 are kept at the first preset distance d in the compressed state. Before releasing the stent, it is only necessary to ensure that the imaging component 300 completely covers the lesion position, so as to ensure that the released vascular stent 400 can also completely cover the lesion position, thus solving the error caused by visual estimation during the release process.
[0052] Moreover, by adopting the above solution, the position judgment method during the release of the vascular stent 400 is changed. The operator no longer needs to estimate the distance between the distal end of the vascular stent 400 and the distal end of the lesion based on the position of the stent imaging component 300 on the image and fine-tune the position of the stent. Instead, the operator directly and intuitively adjusts the position of the imaging component 300, and then releases the vascular stent 400, greatly reducing the operation difficulty and improving the accuracy of stent release.
[0053] In the present invention, by controlling the distance between the distal end of the imaging component 300 and the vascular stent 400, after the vascular stent 400 expands, the imaging component 300 can be exactly located in the central area of the expanded vascular stent 400. Therefore, during the operation, when the imaging component 300 is aligned with the lesion and the length of the imaging component 300 covers the lesion, the microcatheter 100 is withdrawn. Then, the vascular stent 400 separated from the microcatheter 100 can be exactly aligned with the lesion after expansion. At this time, both the distal end and the proximal end of the vascular stent 400 extend a certain length beyond the lesion, and can completely cover the lesion, thus solving the problem that the vascular stent 400 cannot completely cover the lesion due to shortening and inaccurate release. At the same time, it is no longer necessary to estimate the position of the distal end of the stent based on the image and perform fine-tuning. It is only necessary to adjust the position of the imaging component 300, greatly reducing the operation difficulty.
[0054] In a preferred embodiment of the present invention, the limiting member 201 is buckled with the proximal end of the vascular stent 400 to provide a pulling force in the proximal direction for the vascular stent 400 to prevent the vascular stent 400 from accidentally detaching from the introduction sheath or the microcatheter 100.
[0055] Specifically, as Figure 5As shown, the limiting member 201 protrudes from the surface of the pushing wire 200. The proximal end of the vascular stent 400 is provided with an undercut, and the shape of the undercut is adapted to the limiting member 201. The proximal end of the vascular stent 400 is locked by the cooperation of the undercut and the limiting member 201.
[0056] Generally, the proximal end of the existing vascular stent 400 is provided with a radiopaque marker, and the radiopaque marker can be made into an undercut as Figure 5 shown, and the limiting member 201 is clamped by the radiopaque marker.
[0057] In a preferred embodiment of the present invention, a support spring 202 is provided between the pushing wire 200 and the introduction sheath. The distal diameter of the pushing wire 200 is smaller than the proximal diameter, so as to reduce the rigidity of the distal end of the pushing wire 200, improve the flexibility, and facilitate pushing.
[0058] In a preferred embodiment of the present invention, the imaging component 300 is a flexible imaging component 300, such as an imaging spring or an imaging tube, so that when passing through a curved blood vessel, the imaging component 300 bends together with the vascular stent 400 to prevent difficult pushing or damage to the vascular stent 400.
[0059] As Figures 7 to 10 shown, in a preferred embodiment of the present invention, the imaging component 300 is continuously imaged or discontinuously imaged. It only needs to ensure that the distal end and the proximal end of the imaging component 300 can be imaged to satisfy the judgment of the positions of both ends of the imaging component 300. As for the middle part of the imaging component 300, a non-imaging structure or a structure with several discontinuous imaging parts can be adopted. For example, when using an imaging spring as the imaging component 300, the imaging component 300 can be a whole continuous imaging spring, or several shorter imaging springs connected by non-imaging materials.
[0060] The following specifically describes a stent delivery device for facilitating stent positioning according to the present utility model through specific embodiments.
[0061] Embodiment 1
[0062] As Figures 3 to 6 shown, this embodiment provides a stent delivery device for facilitating stent positioning, including a pushing wire 200. The distal end of the pushing wire 200 is connected with an imaging component 300. The distal end of the pushing wire 200 is also provided with a limiting member 201. The limiting member 201 is located at the proximal ends of the vascular stent 400 and the imaging component 300, and is used to fix the vascular stent 400.
[0063] The length of the imaging component 300 is smaller than the length of the vascular stent 400. The vascular stent 400 has a crimped state and an expanded state. When the vascular stent 400 is in the crimped state, there is a first preset distance between the imaging component 300 and the distal end of the vascular stent 400.
[0064] When the vascular stent 400 is in the expanded state, its length is defined as L, then:
[0065] L = S + 2d,
[0066] wherein, S is the length of the imaging component 300, and d is the first preset spacing. In this embodiment, d = 5 mm, that is, the length of the imaging component 300 plus twice the length of the first preset spacing (10 mm) is the length of the vascular stent 400 in the expanded state.
[0067] A support spring 202 is provided on the outer side of the distal end of the pusher wire 200. The diameter of the distal end of the pusher wire 200 is smaller than that of the proximal end to reduce the rigidity of the distal end of the pusher wire 200 and improve the flexibility for easy pushing.
[0068] In this embodiment, the imaging component 300 is an imaging spring, and a continuous imaging structure as Figure 7 shown is adopted, which is convenient for judging the positions of both ends of the imaging component 300.
[0069] Embodiment 2
[0070] The difference between this embodiment and Embodiment 1 is only that the imaging component 300 is an imaging tube, as Figure 8 shown. A plurality of slits are provided on the tube wall of the imaging tube, and the slits are equidistantly arranged on the tube wall of the imaging tube.
[0071] Embodiment 3
[0072] The difference between this embodiment and Embodiment 1 is only that the imaging component 300 is an imaging tube, and a plurality of slits are provided on the tube wall of the imaging tube, and the slits are not equidistantly arranged on the tube wall of the imaging tube.
[0073] Embodiment 4
[0074] The difference between this embodiment and Embodiment 1 is only that the imaging component 300 is an imaging spring, and a non - continuous imaging structure is adopted. Specifically, as Figure 9 shown, the imaging component 300 includes a first imaging spring 301 and a second imaging spring 302. The first imaging spring 301 is located on the proximal side of the second imaging spring 302, and the length between the proximal end of the first imaging spring 301 and the distal end of the second imaging spring 302 is the length S of the imaging component 300.
[0075] The first imaging spring 301 and the second imaging spring 302 are connected by the pusher wire 200.
[0076] Embodiment 5
[0077] The difference between this embodiment and Embodiment 1 is only that the imaging component 300 adopts a non - continuous imaging structure. Specifically, as Figure 10As shown, the developing component 300 is formed by connecting a number of developing springs arranged at intervals and having a relatively short length through a pushing wire 200. The length between the proximal end point of the proximalmost developing spring and the distal end point of the distalmost developing spring is the length S of the developing component 300.
[0078] In summary:
[0079] In the present utility model, the developing component 300 is arranged inside the bracket in a pressed state, and the length of the developing component 300 is adjusted so that the center of the developing component 300 corresponds to the center of the bracket in the released state. During treatment, by completely covering the lesion position with the developing component 300, it can be ensured that the released vascular stent 400 can also completely cover the lesion position, and the lengths of both ends of the vascular stent 400 exceeding the lesion are appropriate. There is no need for the operator to visually estimate based on the image and experience to determine the accurate length of the stent crossing the lesion position, significantly reducing the operation difficulty and solving the problems of visually judging the stent position during stent release and the interference of the shortening before and after stent release on the release accuracy.
[0080] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various modifications and changes can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A stent delivery device for facilitating stent positioning, comprising a push wire, the push wire being used to push a vascular stent, a developing assembly being provided at the distal end of the push wire, characterized in that: A limiting piece is also provided at the distal end of the push wire, and the push wire and the vascular stent are detachably connected via the limiting piece. The length of the developing assembly is smaller than the length of the vascular stent, and the vascular stent has a clamped state and an expanded state. When the vascular stent is in the clamped state, there is a first preset distance between the developing assembly and the distal end of the vascular stent.
2. A stent conveyor for facilitating stent positioning according to claim 1, characterized in that: The first preset distance is 3-5 mm.
3. A stent conveyor for facilitating stent positioning according to claim 1, characterized in that: When the vascular stent is in an expanded state, its length is defined as L, then: L = S + 2d, Wherein, S is the length of the developing assembly, and d is the first preset distance.
4. A stent conveyor for facilitating stent positioning according to claim 1, characterized in that: The limiting component is buckled with the proximal end of the blood vessel stent.
5. A stent conveyor for facilitating stent positioning according to claim 1, characterized in that: A support spring is provided between the pushing wire and the vascular stent, and the support spring is used to resist the proximal end of the vascular stent and provide a thrust.
6. A stent conveyor for facilitating stent positioning according to claim 4, characterized in that: The limiting member protrudes from the surface of the pushing wire, and a buckle is arranged at the proximal end of the vascular stent, and the shape of the buckle is adapted to the limiting member.
7. A stent conveyor for facilitating stent positioning according to any one of claims 1 to 6, characterized in that: The developing assembly is a flexible developing assembly.
8. A stent conveyor for facilitating stent positioning according to claim 7, characterized in that: The developing assembly is for continuous developing or discontinuous developing.
9. A stent conveyor for facilitating stent positioning according to claim 8, characterized in that: The developing assembly is a continuous developing spring, or the developing assembly is composed of a plurality of discontinuously arranged developing springs.
10. A stent conveyor for facilitating stent positioning according to claim 8, characterized in that: The developing assembly is a continuous developing tube, or the developing assembly is composed of a plurality of discontinuously arranged developing tubes.