Tubular implant conveyor

Abstract

The utility model relates to a tubular implant conveyor which comprises a conveying guide wire, a fixing piece, a fastening piece and a fastening wire. The fixing piece partially or wholly sleeves the conveying guide wire, and the fixing piece is provided with a containing cavity with an open far end; the far end of the fastening wire penetrates through an inner cavity of the conveying guide wire to be connected to the near end of the fastening piece, and under the action of the fastening wire, the near end of the tubular implant is clamped between the fastening piece and the inner wall of the fixing piece. The tubular implant conveyor not only can be used for conveying a dense net stent, but also can be used for conveying an aneurysm auxiliary stent. Tubular implantation is fixed in a clamping mode of the fixing piece and the fastening piece, and the conveying guide wire and the fastening wire are matched, so that the size requirement and the requirement for the mutual matching degree are reduced, and meanwhile, the instrument safety is higher.

Description

Technical Field

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

[0002] An aneurysm is a condition in which an artery, due to congenital abnormalities or acquired damage, experiences decreased function and elasticity in its wall, gradually dilating or bulging under hemodynamic stress and other factors. Intracranial aneurysms are the leading cause of subarachnoid hemorrhage; once ruptured, the patient may suffer disability or even death.

[0003] Clinically, the main treatments for intracranial aneurysms include traditional open craniotomy clipping and endovascular interventional therapy. Compared to traditional open craniotomy clipping, endovascular interventional therapy is less invasive, has a faster recovery time, and fewer complications, and is gradually replacing open craniotomy clipping. Stent placement in the aneurysm is one method of endovascular interventional therapy. Currently, the main types of stents used to treat aneurysms are dense mesh stents or aneurysm-assisted stents.

[0004] In existing stent delivery systems, most dense-mesh stents are delivered by the interlocking of a retrieval pad with a certain deformation on the guidewire and the inner wall of the microcatheter. This interference fit causes the dense-mesh stent to move along with the guidewire, thus achieving delivery within the microcatheter. However, excessive interference increases delivery resistance, while insufficient interference prevents proper delivery. For aneurysm-assisted stents, delivery is typically achieved by embedding a protrusion or groove at the stent's tail end into a locking point on the guidewire, working in conjunction with the microcatheter lumen. Appropriate dimensions are required for the protrusion or groove at the stent's tail end and the locking point on the guidewire; otherwise, delivery within the microcatheter is impossible. Therefore, existing stent delivery systems have high requirements for the outer diameter of the retrieval pad, the inner diameter of the microcatheter, the dimensions of the protrusion or groove, and the locking point, as well as their fit, which increases the manufacturing complexity. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a tubular implant delivery device that can be used for both dense mesh stents and aneurysm-assisted stents, in order to address the above-mentioned shortcomings.

[0006] This utility model is achieved through the following technical solution:

[0007] A tubular implant delivery device includes a delivery guidewire, a fixation element, a fastener, and a fastening wire; the fixation element is partially or entirely sleeved on the delivery guidewire, and the fixation element has a receiving cavity with a distal end open; the distal end of the fastening wire passes through the inner cavity of the delivery guidewire and is connected to the proximal end of the fastener, and under the action of the fastening wire, the proximal end of the tubular implant is clamped between the fastener and the inner wall of the fixation element.

[0008] Furthermore, in the tubular implant delivery device, the receiving cavity is frustum-shaped or bowl-shaped with a distal diameter not less than the proximal diameter of the receiving cavity; the shape of the fastener is consistent with the shape of the receiving cavity, the proximal diameter of the fastener is not less than the proximal diameter of the receiving cavity, and the distal diameter of the fastener is between the distal diameter of the receiving cavity and the proximal diameter of the fastener.

[0009] Furthermore, in the tubular implant delivery device, the fastener is a frustum-shaped or bowl-shaped elastic structure.

[0010] Furthermore, in the tubular implant delivery device, both the fixing element and the fastener are provided with radiopaque markings.

[0011] Furthermore, in the tubular implant delivery device, the distal end of the delivery guidewire is connected to the proximal end of the fixation member, and the inner cavity of the delivery guidewire communicates with the receiving cavity of the fixation member.

[0012] Furthermore, in the tubular implant delivery device, the distal end of the delivery guide wire passes through the fixation member and the fastener, and the delivery guide wire is provided with at least one receiving hole perpendicular to its central axis; the fastening wire enters from the proximal end of the delivery guide wire, exits from the receiving hole, and is connected to the proximal end of the fastener.

[0013] Furthermore, in the tubular implant delivery device, the distal end of the delivery guidewire is a flexible free end and is provided with a radiopaque marker.

[0014] Furthermore, in the tubular implant delivery device, the number of fastening wires is not less than two.

[0015] The advantages and effects of this utility model are:

[0016] The tubular implant delivery device provided by this utility model can be used for the delivery of both dense mesh stents and aneurysm-assisted stents. It secures the tubular implant (including but not limited to dense mesh stents and aneurysm-assisted stents) by clamping it with fixators and fasteners. Combined with the functions of the delivery guidewire and fastening wire, it reduces size requirements and the need for perfect fit between devices while enhancing device safety. Attached Figure Description

[0017] Figure 1 This diagram shows a structural schematic of the tubular implant delivery device according to Embodiment 1 of the present invention;

[0018] Figure 2 This diagram shows a structural schematic of the tubular implant delivery device according to Embodiment 2 of the present invention;

[0019] Figure 3 This diagram shows a structural schematic of the tubular implant delivery device according to Embodiment 3 of the present invention;

[0020] Figure 4 This diagram illustrates the application of the tubular implant delivery device provided by this invention.

[0021] Explanation of reference numerals in the attached diagram: 1-tubular implant, 2-guidewire delivery, 3-fixation element, 4-fastener, 5-fastening wire, 6-microcatheter, 7-acceptance port, 8-aneurysm. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. The described embodiments are only some, not all, of the embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings:

[0023] In the description of this utility model, it should be understood that, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, as fixed connections, detachable connections, or integral connections; they can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] Figure 1 This diagram illustrates the structure of a tubular implant delivery device according to Embodiment 1 of the present invention. The tubular implant delivery device, used to deliver a tubular implant to a vascular aneurysm, includes a delivery guidewire 2, a fixation member 3, a fastener 4, and a fastening wire 5. The fixation member 3 has a receiving cavity, the distal end of which is an opening communicating with the receiving cavity. Specifically, the receiving cavity is frustoconical in shape, with a distal diameter not less than the proximal diameter. The fixation member 3 is partially fitted onto the delivery guidewire 2. Specifically, the distal end of the delivery guidewire 2 is connected to the proximal end of the fixation member 3, or the distal end of the delivery guidewire 2 extends into the receiving cavity of the fixation member 3 and is connected to the fixation member 3, so that the inner cavity of the delivery guidewire 2 communicates with the receiving cavity of the fixation member 3. The distal end of the fastening wire 5 penetrates the inner cavity of the delivery guidewire 2 (and the proximal end face of the fixation member 3) and is connected to the proximal end of the fastener 4. The connection point between the distal end of the fastening wire 5 and the proximal end of the fastener 4 is the center point of the proximal end face of the fastener 4. The shape of the fastener 4 is consistent with the shape of the receiving cavity. The proximal diameter of the fastener 4 is not less than the proximal diameter of the receiving cavity, and the distal diameter of the fastener 4 is between the distal diameter of the receiving cavity and the proximal diameter of the fastener 4. Under the action of the fastening wire 5 and the delivery guide wire 2, the proximal end of the tubular implant 1 is clamped between the fastener 4 and the inner wall of the fixing member 3.

[0025] Both the fixation element 3 and the fastener 4 are equipped with radiopaque markings, allowing for accurate identification of their positions during and after delivery. The fastener 4 is a frustum-shaped elastic structure that cooperates with the fixation element 3 to clamp the proximal portion of the tubular implant 1. During the delivery of the tubular implant to the blood vessel, the delivery guidewire 2, fixation element 3, fastener 4, and fastening wire 5 are all located within the microcatheter 6, providing protection and facilitating operation.

[0026] Figure 2 This diagram shows a schematic of the tubular implant delivery device according to Embodiment 2 of the present invention. Unlike Embodiment 1, the receiving cavity is bowl-shaped with a distal diameter not less than the proximal diameter. The fastener 4 is a bowl-shaped elastic structure that cooperates with the fixing member 3 to clamp the proximal portion of the tubular implant 1.

[0027] Figure 3 This diagram illustrates the structure of the tubular implant delivery device according to Embodiment 3 of this invention. Unlike Embodiment 1, the fixing member 3 is integrally fitted onto the delivery guidewire 2. Specifically, the distal end of the delivery guidewire 2 passes through but is not connected to the fixing member 3 or the fastener 4. The distal end of the delivery guidewire 2 is a flexible free end and is marked with a radiopaque indicator, allowing for accurate determination of the distal end's location during and after delivery. At least one receiving hole 7 is provided on the delivery guidewire 2 perpendicular to its central axis. The distal end of the fastening wire 5 enters from the proximal end of the delivery guidewire 2, exits through the receiving hole 7, and connects to the proximal end of the fastener 4. There are at least two fastening wires 5. The connection points between the distal ends of the at least two fastening wires 5 and the proximal end face of the fastener 4 are evenly distributed around the periphery of the proximal end face of the fastener 4.

[0028] like Figure 1 As shown, during delivery, the fastener 4 is located inside the proximal end of the tubular implant 1, and the proximal portion of the tubular implant 1 is placed within the receiving cavity of the fixation member 3. Under the force of the fastening wire 5 and the delivery guide wire 2, the fastener 4 is positioned within the receiving cavity of the fixation member 3, and the fastener 4 and the fixation member 3 clamp the proximal end of the tubular implant 1. Figure 4 As shown, after the delivery is completed, the fastening wire 5 exerts no force on the fastener 4. At this time, the fastener 4 and the fixing member 3 lose the clamping force on the proximal end of the tubular implant 1, and the tubular implant 1 is freed from restraint and released.

[0029] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of implementation of this utility model. Any equivalent changes and modifications made within the protection scope of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A tubular implant delivery device, characterized in that, The delivery device includes a delivery guide wire (2), a fixing member (3), a fastener (4), and a fastening wire (5); the fixing member (3) is partially or entirely sleeved on the delivery guide wire (2), and the fixing member (3) has a receiving cavity with an open distal end; the distal end of the fastening wire (5) passes through the inner cavity of the delivery guide wire (2) and is connected to the proximal end of the fastener (4), and under the action of the fastening wire (5), the proximal end of the tubular implant (1) is clamped between the fastener (4) and the inner wall of the fixing member (3).

2. The tubular implant delivery device according to claim 1, characterized in that, The receiving cavity is a frustum or bowl shape with a distal diameter not less than the proximal diameter of the receiving cavity; the shape of the fastener (4) is consistent with the shape of the receiving cavity, the proximal diameter of the fastener (4) is not less than the proximal diameter of the receiving cavity, and the distal diameter of the fastener (4) is between the distal diameter of the receiving cavity and the proximal diameter of the fastener (4).

3. A tubular implant delivery device according to claim 2, characterized in that, The fastener (4) is a frustum-shaped or bowl-shaped elastic structure.

4. The tubular implant delivery device according to claim 1, characterized in that, Both the fixing member (3) and the fastener (4) are provided with a visible marking.

5. A tubular implant delivery device according to claim 1, characterized in that, The distal end of the delivery guide wire (2) is connected to the proximal end of the fixing member (3), and the inner cavity of the delivery guide wire (2) is connected to the receiving cavity of the fixing member (3).

6. A tubular implant delivery device according to claim 1, characterized in that, The distal end of the conveying guide wire (2) passes through the fixing member (3) and the fastener (4), and the conveying guide wire (2) is provided with at least one receiving hole (7) perpendicular to its central axis; the fastening wire (5) enters from the proximal end of the conveying guide wire (2), exits from the receiving hole (7), and is connected to the proximal end of the fastener (4).

7. A tubular implant delivery device according to claim 6, characterized in that, The distal end of the delivery guide wire (2) is a flexible free end and is marked with a imaging indicator.

8. A tubular implant delivery device according to claim 6, characterized in that, The number of fastening wires (5) is no less than two.

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