Stent delivery device

Abstract

The utility model discloses a kind of support conveying devices, it is related to medical instrument technical field.The support conveying device includes conveying catheter, positioning release device and operating component;Conveying catheter includes inner tube and outer tube sleeved on the outer periphery of inner tube;Positioning release device includes the release hook with storage state and unfolded state, and release hook is located on the distal end of inner tube;Operating component is connected with the proximal end of conveying catheter and is used to drive inner tube and / or outer tube axial movement, to make release hook switch between storage state and unfolded state;In unfolded state, release hook is located outside outer tube, to be used for hooking support;In storage state, release hook is contained in outer tube, to be used for releasing support.The utility model improves the structure of support conveying device, improves the accuracy of vascular stent positioning, reduces positioning difficulty, improves the convenience of operator operation, improves treatment effect.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a stent delivery device. Background Technology

[0002] Common vascular diseases such as aneurysms, ruptured blood vessels, and perforated blood vessels can also cause acute bleeding, posing a life-threatening risk to patients. To address these issues, endovascular stenting is a commonly used treatment method in clinical practice. This method has advantages such as minimal invasiveness, fewer complications, high safety, and less patient discomfort. The specific process involves delivering a compressed stent to the location of the lesion, then releasing it. The expanded stent covers the diseased blood vessel, isolating the lesion and creating a new blood flow channel, thereby achieving the therapeutic goal.

[0003] Existing stent delivery devices include an outer sheath, a core tube, a support tube, a limiting head, a fixing handle, and an operating handle. The two ends of the core tube are connected to the limiting head and the support tube, respectively. The outer sheath is movable and coaxially sleeved around the limiting head, the core tube, and the support tube, forming a receiving cavity for accommodating the vascular stent between the core tube and the outer sheath. Both the fixing handle and the operating handle are movable around the support tube, with the outer sheath passing through the fixing handle and connecting to the operating handle. The operating handle, positioned on the support tube, can drive the outer sheath to move axially relative to the central axis of the support tube at rapid or slow speeds. The operating handle moves the outer sheath away from the limiting head, gradually freeing the vascular stent from the compression of the outer sheath within the receiving cavity. Due to its elasticity, the vascular stent gradually expands radially until it adheres to the vessel wall. During the procedure, medical personnel can rotate and drag the outer sheath rapidly or slowly as needed, ultimately releasing the vascular stent within the vessel at rapid or slow speeds.

[0004] However, the aforementioned stent delivery device may not be able to accurately position the stent during deployment, especially near the opening of a vascular branch. If the positioning is inaccurate, it may block the branch or fail to completely cover the lesion. Severe blockage of the branch can cause ischemia, serious adverse events, and even endanger life. If necessary, the vascular opening may need to be reopened, which is a complicated process and causes secondary trauma to the patient. Utility Model Content

[0005] The main objective of this invention is to provide a stent delivery device that improves the positioning accuracy of the stent delivery device when releasing the stent, thereby enhancing the convenience of operation for the operator and improving the treatment effect.

[0006] To achieve the above objectives, this utility model proposes a support conveying device, comprising:

[0007] A delivery conduit, comprising an inner tube and an outer tube sleeved around the periphery of the inner tube;

[0008] A positioning and release device includes a release hook having a retracted state and an extended state, the release hook being disposed on the distal end of the inner tube; and

[0009] An operating component, connected to the proximal end of the delivery conduit and used to drive the inner tube and / or the outer tube to move axially thereto, so that the release hook switches between the retracted state and the deployed state;

[0010] In the deployed state, the release hook is located outside the outer tube to hook the bracket;

[0011] In the retracted state, the release hook is housed within the outer tube for releasing the support.

[0012] Optionally, the release hook includes an installation tube and a plurality of barbs provided on the installation tube, all of which are bent toward the distal end of the inner tube.

[0013] Optionally, the barb includes a bent section and an extension section connected to one end of the bent section, the other end of which is connected to the mounting tube.

[0014] Optionally, the tangent of the curved section forms an angle with the centerline of the mounting tube, with the opening facing the distal end of the inner tube, and the angle is 15-45°.

[0015] Optionally, the extension is arranged parallel to the centerline of the mounting tube.

[0016] Optionally, a plurality of the barbs are arranged at circumferential intervals along the mounting tube and symmetrically arranged about the center line of the mounting tube.

[0017] Optionally, the length of the mounting tube is 2-5 mm; and / or

[0018] The mounting tube is fixed to the inner tube by circumferential compression or by threaded connection.

[0019] Optionally, the support conveying device further includes a guide head located at the distal end of the inner tube and connected to the mounting tube.

[0020] Optionally, the release hook is made of shape memory alloy.

[0021] Optionally, the operating component includes a control knob connected to the proximal end of the inner tube or the outer tube and used to control the axial movement of the inner tube or the outer tube by rotation; and / or

[0022] The operating component includes a sliding control element, which is connected to the proximal end of the inner tube or the outer tube and is used to control the axial movement of the inner tube or the outer tube by sliding.

[0023] In the technical solution of this utility model, the stent delivery device includes a delivery catheter, a positioning and release device, and an operating component. The delivery catheter includes an inner tube and an outer tube sleeved around the periphery of the inner tube. The positioning and release device includes a release hook having a retracted state and an extended state, the release hook being located on the distal end of the inner tube. The operating component is connected to the proximal end of the delivery catheter and is used to drive the inner tube and / or the outer tube to move along their axial direction, so that the release hook switches between the retracted state and the extended state. In the extended state, the release hook is located outside the outer tube to hook the stent; in the retracted state, the release hook is housed inside the outer tube to release the stent. It can be understood that this utility model improves the structure of the stent delivery device. By setting a release hook to hook or release the stent, it greatly reduces the difficulty of positioning, improves the accuracy of vascular stent positioning, thereby improving the convenience of operation for the operator and enhancing the treatment effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the bracket conveying device of this utility model when the positioning and release device is in the storage state;

[0026] Figure 2 This is a schematic diagram of the structure of the bracket conveying device of this utility model when the positioning and release device is in the deployed state;

[0027] Figure 3 This is a schematic diagram showing the connection of the positioning and release device, the delivery conduit, and the guide head in one embodiment of the support delivery device of this utility model;

[0028] Figure 4 This is a schematic diagram showing the connection between the positioning and release device and the guide head in one embodiment of the bracket conveying device of this utility model;

[0029] Figure 5 This is a schematic diagram of the positioning and release device in one embodiment of the bracket conveying device of this utility model;

[0030] Figure 6 This is a schematic diagram showing the state of the support body when it is released in one embodiment of the support conveying device of this utility model;

[0031] Figure 7 This is a schematic diagram of the state after the inner tube is retracted following the release of the support body in one embodiment of the support conveying device of this utility model;

[0032] Figure 8 This is a schematic diagram of the state after the support body is positioned and released and the release hook is retracted in one embodiment of the support conveying device of this utility model.

[0033] Explanation of icon numbers:

[0034] 10. Delivery conduit; 20. Positioning and release device; 30. Operating component; 11. Inner tube; 12. Outer tube; 21. Release hook; 211. Installation tube; 212. Barb; 2121. Bending section; 2122. Extension section; 111. Guide head; 200. Support.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. If the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. The technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0040] This utility model proposes a stent delivery device, which can be used to deliver vascular stents, covered stents, etc., and is not limited thereto.

[0041] Reference Figures 1 to 8 In one embodiment of this utility model, the stent delivery device includes a delivery conduit 10, a positioning and release device 20, and an operating component 30. The delivery conduit 10 includes an inner tube 11 and an outer tube 12 sleeved around the outer periphery of the inner tube 11. The positioning and release device 20 includes a release hook 21 having a retracted state and an extended state, the release hook 21 being disposed on the distal end of the inner tube 11. The operating component 30 is connected to the proximal end of the delivery conduit 10 and is used to drive the inner tube 11 and / or the outer tube 12 to move along their axial direction, so that the release hook 21 switches between the retracted state and the extended state. In the extended state, the release hook 21 is located outside the outer tube 12 to hook the stent 200; in the retracted state, the release hook 21 is accommodated inside the outer tube 12 to release the stent 200.

[0042] In this embodiment, the inner tube 11 may be hollow to form a channel for the guidewire to pass through, so that the operator can deliver the stent delivery device to the target site, which helps to improve the efficiency of operation. A receiving cavity for accommodating the vascular stent 200 or the covered stent 200 may be formed between the inner tube 11 and the outer tube 12.

[0043] In this embodiment, the release hook 21 can be made of stainless steel or nickel-titanium alloy and other shape memory alloy materials, which have shape memory function after being shaped.

[0044] In this embodiment, the operating component 30 may be a knob structure, a sliding structure, etc., and no specific limitation is made here.

[0045] It is understood that this utility model improves the structure of the stent delivery device by setting a release hook 21 to hook or release the stent 200, which greatly reduces the difficulty of positioning, improves the accuracy of vascular stent 200 positioning, thereby improving the convenience of operation for the operator and enhancing the treatment effect.

[0046] To facilitate the installation of the release hook 21 and further improve the efficiency and effectiveness of the release hook 21 in releasing or hooking the bracket 200, refer to Figures 1 to 5 In one embodiment, the release hook 21 may include an installation tube 211 and a plurality of barbs 212 disposed on the installation tube 211, all of which are bent toward the distal end of the inner tube 11. The number of barbs 212 is preferably four or more, but is not limited here.

[0047] In this embodiment, the barb 212 includes a bent section 2121 and an extension section 2122 connected to one end of the bent section 2121, and the other end of the bent section 2121 is connected to the mounting tube 211.

[0048] Preferably, the tangent of the bent section 2121 forms an angle with the centerline of the mounting tube 211, with the opening facing the distal end of the inner tube 11. The angle can be 15-45°. The extension section 2122 is arranged parallel to the centerline of the mounting tube 211. In this way, the barb 212 of the release hook 21 can be better housed inside the outer tube 12, and the release hook 21 as a whole can move more smoothly in and out of the outer tube 12.

[0049] To ensure the stability of the release hook 21 anchoring bracket 200 and to make the force on the bracket 200 more uniform in the circumferential direction, further, several barbs 212 can be arranged at intervals along the circumferential direction of the mounting tube 211 and symmetrically set about the center line of the mounting tube 211.

[0050] For easy installation of release hook 21, refer to Figures 1 to 8 In one embodiment, the length of the mounting tube 211 can be 2-5 mm; the mounting tube 211 is fixed to the inner tube 11 by ring compression or threaded connection. In this embodiment, the stent delivery device may also include a guide head 111, i.e., a tip head, which is located at the distal end of the inner tube 11 and is connected to the mounting tube 211. This allows the operator to more quickly deliver the stent 200 to the target site.

[0051] Preferably, the length of the mounting tube 211 is 2-5 mm. When the mounting tube 211 and the inner tube 11 are connected by threads, the thread length of the mounting tube 211 can be set to 2-4 mm. The mounting tube 211 can also be extended 10-15 mm towards the guide head 111 and have an external thread at the distal end. The guide head 111 has an internal thread so that the mounting tube 211 and the guide head 111 are connected by threads.

[0052] Main reference Figure 1 and Figure 2 In one embodiment, the operating component 30 may include a control knob and a sliding control element. The control knob is connected to the proximal end of the inner tube 11 or the outer tube 12 and is used to control the axial movement of the inner tube 11 or the outer tube 12 by rotation. The sliding control element is connected to the proximal end of the inner tube 11 or the outer tube 12 and is used to control the axial movement of the inner tube 11 or the outer tube 12 by sliding.

[0053] In this embodiment, the control knob can be used for slow release of the support 200, while the sliding control can be used for rapid release of the support 200. Specifically, the control knob can be connected to the outer tube 12 via a threaded structure, and the release speed is controlled by controlling the movement of the outer tube 12 through the threaded structure. The sliding control can be a manually sliding structure, and the release process is positively correlated with the force applied by the practitioner.

[0054] In use, the delivery conduit 10 can be connected to the handle via a T-shaped connector, which connects to the slider. Pushing the slider causes the outer tube 12 to retract, releasing the main body of the support 200 located between the inner tube 11 and the outer tube 12. After the main body of the support 200 is released, its front end hooks onto the release hook 21. At this time, the inner tube 11 of the retracting delivery system drives the release hook 21 to retract and be stored in the outer tube 12, thereby releasing the distal end of the main body of the support 200 and completing the overall positioning and release of the support 200.

[0055] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stent delivery device, characterized by, include: A delivery conduit, comprising an inner tube and an outer tube sleeved around the periphery of the inner tube; A positioning and release device includes a release hook having a retracted state and an extended state, the release hook being disposed on the distal end of the inner tube; and An operating component, connected to the proximal end of the delivery conduit and used to drive the inner tube and / or the outer tube to move axially thereto, so that the release hook switches between the retracted state and the deployed state; In the deployed state, the release hook is located outside the outer tube to hook the bracket; In the retracted state, the release hook is housed within the outer tube for releasing the support.

2. The stent delivery device of claim 1, wherein, The release hook includes an installation tube and several barbs provided on the installation tube, all of which are bent toward the distal end of the inner tube.

3. The support conveying device as described in claim 2, characterized in that, The barb includes a curved section and an extension section connected to one end of the curved section, the other end of which is connected to the mounting tube.

4. The stent delivery device of claim 3, wherein the stent delivery device is configured to be inserted into the patient's body through a catheter. The tangent of the curved section forms an angle with the centerline of the mounting tube, with the opening facing the distal end of the inner tube, and the angle is 15-45°.

5. The stent delivery device of claim 4, wherein the stent delivery device further comprises a stent. The extension section is arranged parallel to the centerline of the mounting pipe.

6. The stent delivery device of claim 2, wherein, Several of the barbs are arranged at intervals along the circumference of the mounting tube and are symmetrically arranged about the center line of the mounting tube.

7. The stent delivery device of claim 2, wherein, The length of the mounting tube is 2-5mm; and / or The mounting tube is fixed to the inner tube by circumferential compression or by threaded connection.

8. The stent delivery device of claim 2, wherein, The support conveying device also includes a guide head, which is located at the distal end of the inner tube and is connected to the mounting tube.

9. The support conveying device as described in claim 1, characterized in that, The release hook is made of shape memory alloy.

10. The stent delivery device of any of claims 1-9, wherein, The operating component includes a control knob connected to the proximal end of the inner tube or the outer tube and used to control the axial movement of the inner tube or the outer tube by rotation; and / or The operating component includes a sliding control element, which is connected to the proximal end of the inner tube or the outer tube and is used to control the axial movement of the inner tube or the outer tube by sliding.

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