Stent leading-in device
By designing a locking member at the connection between the push wire and the introduction device of the bracket introduction device, and locking the push wire with the combined structure of the adjusting member and the friction member, the problem of the stent being easily fall off during the conveying process is solved, and the stability and safety of the surgery are improved.
Patent Information
- Application Number
- CN202421482384.0
- 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
The existing stent introduction device lacks a locking structure at the connection of the push wire and the introduction device, which causes the stent to fall off accidentally or be released early during the delivery process, increasing the risk and cost of surgery.
A bracket introduction device is designed, including a sheath and a locking member, which consists of a connecting seat, a adjusting member and a friction member. The adjusting member squeezes the friction member to shrink its inner hole and provides a positive pressure locking of the push wire to prevent it from accidentally moving.
It effectively prevents accidental shedding or early release of the stent during delivery, improves the stability and safety of the operation, and reduces the cost and time of the operation.
Smart Images
Figure CN222899405U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a stent introduction device. Background Art
[0002] The treatment of stroke depends on its type: hemorrhagic or ischemic stroke. In interventional therapy, specially designed stents are used to reopen or stabilize the affected blood vessels. When treating ischemic stroke, stents help restore blood flow and limit the damaged area; while in dealing with hemorrhagic stroke, they may be used to prevent further rupture of blood vessels, thus reducing bleeding. When using stents for interventional therapy, the general surgical strategy is to first establish a passage, then introduce the stent into the microcatheter passage, deliver the stent to the lesion site through the passage, and push out the stent to reconstruct blood circulation to complete the operation.
[0003] The method of treating stroke has high requirements for stent delivery. The stent should have good delivery and positioning performance, and needs to be compressed into a smaller diameter introduction device and then pushed from outside the body and accurately released at the lesion site. Therefore, the auxiliary stent delivery system has high requirements for the delivery resistance of the stent, the release flexibility, and the release accuracy. Generally speaking, before the stent system is transferred to the stent delivery microcatheter, the stent is compressed and loaded into the main body of the stent introduction device. During the process of transferring to the stent delivery microcatheter, the main body of the introduction device loaded with the stent plays a very crucial role. Its head end size, delivery resistance, connection stability with the microcatheter, and the smoothness of the inner lumen after connection affect the delivery stability and smoothness of the stent. A stent delivery process with high stability and no jamming can improve the operator's operation experience, reduce the probability of instrument failure, shorten the operation time, and also play a positive role in the postoperative recovery of patients.
[0004] Before using the stent delivery system, flushing is an essential step. First, the stent system needs to be taken out from the coil, and then the end of its introduction device is connected to the RHV connected to the microcatheter, and it is ensured that the connection is firm. Thereafter, the inside of the system is flushed through the introduction device, and the air in the system is thoroughly removed with a suitable liquid. When it is observed that droplets emerge from the proximal end of the introduction device, it indicates that the flushing work has been completed, and at this time the system is ready to enter the next stage.
[0005] After flushing is completed, the introduction device is docked with the microcatheter connector, and the three-way valve is locked to ensure fixation. The stent and the push wire are loaded into the introduction device. At this time, the stent is slowly pushed into the microcatheter through the push wire and moved along the blood vessel path to the lesion site. After reaching the position, the stent is released from the microcatheter and expands itself at body temperature by using the characteristics of the shape memory alloy or returns to its original state through its inherent elasticity, and stably adheres to the blood vessel wall.
[0006] Such as Figure 1As shown, due to the lack of a key locking structure between the wire pushing part and the introducing device, there are certain risks in the above-mentioned processes of removing, rinsing, and transferring the stent to the microcatheter for the stent delivery system. An inadvertent tug on the wire pushing part by the operator may cause the stent to accidentally fall off or be prematurely released, thereby resulting in the failure of the instrument. In such a case, it is required to use a spare stent system to complete the operation, which increases the surgical cost and may have an adverse impact on the smoothness and efficiency of the operation.
[0007] Therefore, it is necessary to provide an improved technical solution to address the deficiencies of the above-mentioned prior art. Summary of the Invention
[0008] The purpose of the present utility model is to provide a stent introducing device that can be installed at the connection part between the wire pushing part and the introducing device for locking the wire pushing part to prevent its accidental movement, so as to solve the problems existing in the above-mentioned prior art.
[0009] To achieve the above purpose, the present utility model provides the following technical solution:
[0010] A stent introducing device includes a sheath tube. A locking member is connected to the proximal end of the sheath tube. The locking member includes a connection seat. The distal end of the connection seat is fixedly connected to the sheath tube. An adjusting member is provided at the proximal end of the connection seat. A friction member is provided inside the connection seat. The friction member has elasticity. The adjusting member, the friction member, and the connection seat are coaxially arranged. The adjusting member, the friction member, and the connection seat are all provided with inner holes for the guide wire to pass through. When the friction member is squeezed by the adjusting member, the diameter of its inner hole decreases.
[0011] Preferably, the adjusting member is threadedly connected to the connection seat.
[0012] Preferably, when the adjusting member is rotated, the distal end of the adjusting member approaches or moves away from the friction member.
[0013] Preferably, a first groove is provided at the proximal end of the connection seat. The friction member is placed at the distal end of the first groove. The proximal end of the first groove is threadedly connected to the distal end of the adjusting member.
[0014] Preferably, the proximal end of the friction member is frustum-shaped. A second groove is provided at the distal end of the adjusting member. The bottom diameter of the second groove is not greater than the diameter of the proximal end of the friction member.
[0015] Preferably, the bottom diameter of the second groove is smaller than the diameter of the proximal end of the friction member.
[0016] Preferably, the distal end of the friction member is frustum-shaped. The shape of the distal end of the first groove is adapted to the shape of the distal end of the friction member.
[0017] Preferably, the sheath tube is a single-lumen tube, and a plurality of water outlet holes are provided on the tube wall of the sheath tube.
[0018] Preferably, the water outlet holes are located at the proximal end of the sheath tube.
[0019] Preferably, the number of the water outlet holes is 1; or, the number of the water outlet holes is greater than 1 and is arranged along the circumferential direction or the axial direction of the sheath tube.
[0020] Beneficial effects:
[0021] (1) In the present application, a locking member is provided at the distal end of the sheath tube. By using the adjusting member to squeeze the friction member to deform it, the inner diameter of the inner hole of the friction member is reduced, and then a large positive pressure is applied to the pushing wire. When the pushing wire is pulled, the friction force of the friction member is used to limit the movement of the pushing wire, thereby avoiding accidental detachment or premature release of the stent.
[0022] (2) The friction member is located between the adjusting member and the connecting seat, and can also play a sealing role to prevent liquid leakage at the proximal end of the connecting seat.
[0023] (3) Water outlet holes are provided on the tube wall of the sheath tube. Before the operation, the flushing liquid can be injected from the distal end of the introducing device and discharged through the water outlet holes, and the air and the flushing liquid inside the stent system can be discharged without loosening the adjusting member for evacuation, providing a more stable and reliable operation environment for the operation. Description of the Drawings
[0024] The schematic diagram of the drawings forming a part of the present application is used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:
[0025] Figure 1 It is a schematic structural diagram of a stent system in the prior art.
[0026] Figure 2 It is the front view of the stent introducing device provided by the embodiment of the present invention.
[0027] Figure 3 It is the front view structural diagram of the locking member in the embodiment of the present invention.
[0028] Figure 4 It is the front view of the adjusting member in the embodiment of the present invention.
[0029] Figure 5 It is the front view structural diagram of the friction member in the embodiment of the present invention.
[0030] Figure 6 It is the front view of the stent introducing device provided by Embodiment 2 of the present invention.
[0031] Figure 7This is a schematic diagram of the distribution of the water outlet holes in Embodiment 2 of the present utility model.
[0032] In the figure: 100, sheath tube; 200, connecting seat; 300, adjusting member; 400, friction member; 101, water outlet hole; 201, first groove; 301, second groove. Detailed implementation manners
[0033] 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 the 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.
[0034] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. 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 thus should not be construed as a limitation to the present utility model.
[0035] 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 original number, and above, below, within, etc. are understood as including the original number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.
[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0037] In the description of the present utility model, it should be noted that unless otherwise clearly defined 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 a non-detachable 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 or indirect communication of two elements or the interaction relationship between two elements.
[0038] In the description of the present utility model, the "proximal end" is the end close to the operator, and the "distal end" is the end far from the operator.
[0039] The present utility model will be described in detail below in conjunction with 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.
[0040] In view of the problem that the pusher wire is prone to displacement during the use of the current stent introduction device, the present utility model provides a stent introduction device, as Figure 2 , 3 shown, which includes a sheath 100. The sheath 100 is a single-lumen tube, and its internal cavity allows the pusher wire to pass through. A locking member is connected to the proximal end of the sheath 100. The locking member is used to fix the pusher wire passing through the sheath 100 when needed to prevent the pusher wire from displacing; the locking member includes a connection seat 200. The distal end of the connection seat 200 is fixedly connected to the sheath 100. An adjusting member 300 is provided at the proximal end of the connection seat 200. A friction member 400 is provided inside the connection seat 200. The adjusting member 300, the friction member 400 and the connection seat 200 are coaxially arranged. At the same time, the adjusting member 300, the friction member 400 and the connection seat 200 are all provided with inner holes for the guide wire to pass through. The friction member 400 has elasticity and can undergo elastic deformation under external extrusion. When the friction member 400 is extruded by the adjusting member 300, the diameter of its inner hole shrinks.
[0041] Through the above settings, the adjusting member 300 can be used to extrude the friction member 400 to make it deform, resulting in the shrinkage of the inner diameter of the inner hole of the friction member 400. Subsequently, a large positive pressure is applied to the pusher wire. When the pusher wire is pulled, the friction of the friction member 400 is used to limit the movement of the pusher wire, thereby solving the problem of accidental detachment or premature release of the stent.
[0042] In the present utility model, the friction member 400 is made of a material with good elasticity and a rough surface, such as silicone, rubber, etc.
[0043] In the present utility model, as Figure 3 , 4 shown, the adjusting member 300 is threadedly connected to the connection seat 200. When the adjusting member 300 is rotated, the distal end of the adjusting member 300 approaches or moves away from the friction member 400. By rotating the adjusting member 300, the position of the adjusting member 300 is adjusted, and then the extrusion force of the adjusting member 300 on the friction member 400 is changed.
[0044] Specifically, a first groove 201 is provided at the proximal end of the connection seat 200. The opening direction of the first groove 201 faces the proximal end of the connection seat 200. The friction member 400 is placed at the distal end of the first groove 201. The inner wall of the proximal end of the first groove 201 is provided with threads and is connected to the distal end of the adjusting member 300 through the threads.
[0045] In a preferred embodiment of the present utility model, as Figure 5As shown, the proximal end of the friction member 400 is frustum-shaped, and the distal end of the adjusting member 300 is provided with a second groove 301. The bottom diameter of the second groove 301 is not greater than the diameter of the proximal end of the friction member 400. When the distal end of the adjusting member 300 moves towards the friction member 400, the friction member 400 is forced to contract under the action of the extrusion force, so that the inner hole diameter of the friction member 400 gradually decreases, pressing on the pushing wire passing through the inner hole, and using the frictional force between the friction member 400 and the pushing wire to prevent the displacement of the pushing wire.
[0046] More preferably, the bottom diameter of the second groove 301 is smaller than the diameter of the proximal end of the friction member 400. Through this setting, when the friction member 400 is not squeezed, there is a certain distance between its proximal end and the bottom of the second groove 301, so that the friction member 400 has a tendency to move towards the bottom of the second groove 301 after being squeezed. Since the bottom diameter of the second groove 301 is smaller than the diameter of the proximal end of the friction member 400, the proximal end of the friction member 400 will be more significantly compressed, making it easier to lock the pushing wire.
[0047] In a preferred embodiment of the present utility model, the distal end of the friction member 400 is also frustum-shaped, and the shape of the distal end of the first groove 201 is adapted to the shape of the distal end of the friction member 400, so that after the friction member 400 is squeezed by the pushing member, obvious compression occurs at both ends, increasing the frictional force between the friction member 400 and the pushing wire.
[0048] Considering that the locking member at the proximal end of the sheath tube 100 will affect the drainage during preoperative flushing, in a preferred embodiment of the present utility model, the tube wall of the sheath tube 100 is provided with a plurality of water outlet holes 101. Before the operation, the flushing liquid can be injected from the distal end of the introduction device, and the air and flushing liquid inside the stent system are discharged from the water outlet holes 101, providing a more stable and reliable surgical operation environment.
[0049] In a preferred embodiment of the present utility model, the water outlet holes 101 are located at the proximal end of the sheath tube 100 and close to the distal end of the connection seat 200, so that the sheath tube 100 can be fully flushed before the operation. The water outlet holes 101 can be provided with only one, such as Figure 6 , or a plurality of them can be provided; as shown in (a) to (c) in Figure 7 , the water outlet holes 101 can be arranged circumferentially or axially on the surface of the sheath tube 100, or arranged irregularly.
[0050] The following will specifically describe a stent introduction device of the present utility model through specific embodiments.
[0051] Embodiment 1
[0052] This embodiment provides a stent introduction device, such as Figures 2 - 3As shown in the figure, it includes a sheath tube 100. The sheath tube 100 is a single-lumen tube. A locking member is connected to the proximal end of the sheath tube 100 for fixing the push wire passing through the sheath tube 100 to prevent the displacement of the push wire. The locking member includes a connection seat 200. The distal end of the connection seat 200 is fixedly connected to the sheath tube 100. An adjusting member 300 is provided at the proximal end of the connection seat 200. A friction member 400 is provided inside the connection seat 200. The adjusting member 300, the friction member 400 and the connection seat 200 are coaxially arranged. At the same time, the adjusting member 300, the friction member 400 and the connection seat 200 are all provided with inner holes for the guide wire to pass through. The inner hole diameter of the friction member 400 is slightly larger than the diameter of the push wire. The friction member 400 has good elasticity and can undergo elastic deformation under external extrusion. When the friction member 400 is extruded by the adjusting member 300, its inner hole diameter shrinks.
[0053] Specifically, in this embodiment, as Figures 2 - 4 shown, the adjusting member 300 is a nut and is threadedly connected to the connection seat 200. When the adjusting member 300 is rotated, the distal end of the adjusting member 300 approaches or moves away from the friction member 400. The friction member 400 is a silicone rubber ring, which has good elasticity and a non-smooth surface. After being extruded by the distal end of the adjusting member 300, it can produce a large elastic deformation and generate a large frictional force with the push wire.
[0054] A first groove 201 is provided at the proximal end of the connection seat 200. The opening direction of the first groove 201 faces the proximal end of the connection seat 200. The friction member 400 is placed at the distal end of the first groove 201. The inner wall of the proximal end of the first groove 201 is provided with threads and is connected to the distal end of the adjusting member 300 through the threads.
[0055] As Figure 5 shown, both the proximal end and the distal end of the friction member 400 are frustum-shaped, making the friction member 400 in a double-cone shape. A second groove 301 is provided at the distal end of the adjusting member 300. The bottom diameter of the second groove 301 is smaller than the proximal end diameter of the friction member 400, so that the friction member 400 has a tendency to move towards the bottom of the second groove 301 after being extruded, generating a greater extrusion force and being able to lock the push wire more effectively.
[0056] At the same time, the shape of the distal end of the first groove 201 is adapted to the shape of the distal end of the friction member 400, so that the friction member 400 can seal the bottom of the first groove 201.
[0057] During use, it is necessary to first confirm whether the adjusting member 300 is tightened to ensure that the push wire has been fixed by the friction member 400. Then, take out the stent system from the coil, flush the inside of the system through the introduction device, and use a suitable liquid to thoroughly remove the air in the system. When it is observed that droplets emerge from the proximal end of the introduction device, it indicates that the flushing work has been completed. At this time, the system is ready and can enter the next stage.
[0058] Before use, the distal end of the pusher wire sequentially passes through the inner holes of the adjusting member 300, the friction member 400 and the connecting seat 200, is assembled into the sheath 100, and the adjusting member 300 is tightened so that the proximal end of the pusher wire is fixed by the friction member 400; after confirming that the adjusting member 300 is tightened, the stent system can be taken out and rinsed. When rinsing, the adjusting member 300 should be loosened for drainage, and after rinsing is completed, the stent is transferred to the microcatheter. During the above process, the friction member 400 can ensure that the pusher wire is locked and does not move under the influence of external forces, thereby avoiding problems such as accidental detachment or premature release of the stent.
[0059] Embodiment 2
[0060] Considering that the locking member at the proximal end of the sheath 100 will affect the drainage during preoperative rinsing, this embodiment provides a stent introduction device, which is improved on the basis of Embodiment 1. Specifically, as Figure 6 shown, the tube wall of the sheath 100 is provided with a water outlet hole 101, and the water outlet hole 101 is located at the proximal end of the sheath 100. Through this setting, the flushing liquid can be injected from the distal end of the introduction device before the operation to discharge the air inside the stent system. After the flushing is completed, the flushing liquid can be discharged through the water outlet hole 101, which is convenient for observation.
[0061] In summary:
[0062] The utility model uses the adjusting member 300 to squeeze the friction member 400 to deform it, resulting in a reduction in the inner diameter of the inner hole of the friction member 400, and then applying a large positive pressure to the pusher wire. When the pusher wire is pulled, the friction of the friction member 400 is used to limit the movement of the pusher wire, thereby solving the problem of accidental detachment or premature release of the stent. The provided friction member 400 can also play a role in sealing the proximal end of the sheath 100. By providing the water outlet hole 101 on the sheath 100, the flushing liquid can be injected from the distal end of the introduction device before the operation, and the air inside the stent system can be discharged from the water outlet hole 101, providing a more stable and reliable surgical operation environment.
[0063] The above are only the preferred embodiments of the utility model and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.
Claims
1. A stent introduction device, comprising a sheath tube, characterized in that: The proximal end of the sheath is connected with a locking piece, and the locking piece includes a connecting seat. The distal end of the connecting seat is fixedly connected to the sheath, and the proximal end of the connecting seat is provided with an adjusting piece. A friction piece is provided inside the connecting seat, and the friction piece is elastic. The adjusting piece, the friction piece and the connecting seat are coaxially arranged, and the adjusting piece, the friction piece and the connecting seat are all provided with an inner hole for the guide wire to pass through. When the friction piece is squeezed by the adjusting piece, the diameter of the inner hole is reduced.
2. A stent introduction device according to claim 1, characterized in that: The adjusting member is connected to the connecting seat via threads.
3. A stent introduction device according to claim 2, characterized in that: When the adjusting member is rotated, the distal end of the adjusting member approaches or moves away from the friction member.
4. A stent introduction device according to claim 3, characterized in that: A first groove is provided at the proximal end of the connecting seat, the friction member is placed at the distal end of the first groove, and the proximal end of the first groove is connected to the distal end of the adjusting member through a thread.
5. A stent introduction device according to claim 4, characterized in that: The proximal end of the friction member is in a truncated cone shape, and the distal end of the adjustment member is provided with a second groove, and the bottom diameter of the second groove is not greater than the proximal end diameter of the friction member.
6. A stent introduction device according to claim 5, characterized in that: The bottom diameter of the second groove is smaller than the proximal end diameter of the friction member.
7. A stent introduction device according to claim 5 or 6, characterized in that: The distal end of the friction member is in a truncated cone shape, and the shape of the distal end of the first groove is adapted to the shape of the distal end of the friction member.
8. A stent introduction device according to any one of claims 1 to 6, characterized in that: The sheath tube is a single-lumen tube, and a tube wall of the sheath tube is provided with a plurality of water outlet holes.
9. A stent introduction device according to claim 8, characterized in that: The water outlet is located at the proximal end of the sheath tube.
10. A stent introduction device according to claim 8, characterized in that: The number of the water outlet holes is 1; or, the number of the water outlet holes is greater than 1, and they are arranged along the circumference or axial direction of the sheath tube.