Conveying device for assisting in positioning blood flow guiding dense net support

Abstract

The utility model relates to a conveying device for assisting in positioning a blood flow guiding dense net support. The conveying device comprises a protection tube and a guide wire movably arranged in the protection tube. The far end of the guide wire is provided with a support placing area, the two ends of the support placing area are respectively provided with a limiting block, and a support is arranged between the two limiting blocks. The auxiliary stent positioning device is used for assisting stent positioning in the blood flow guiding dense net stent releasing process, a doctor can conveniently and accurately position the far-end position of the stent, the stent can be released in situ, the stent does not need to be released and then pulled back for positioning, operation time is saved, and meanwhile the risk of blood vessel injury is avoided. The position of the tail end of the stent can be estimated by combining the shortening rate of the stent, important branch blood vessels can be prevented from being covered, it is guaranteed that the stent falls at a safe position, and safety and effectiveness of an operation are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a delivery device for a blood flow guiding mesh stent for assisting positioning. Background Technology

[0002] Current dense-mesh stent implantation procedures often require deploying a portion of the stent further away for distal positioning, then pulling it back to the desired location before releasing the remaining stent. The estimation of the stent's distal end position largely relies on the surgeon's familiarity with the stent's properties to roughly determine its likely placement. This dense-mesh stent implantation method demands a high level of skill and experience from the surgeon. The deployment and retraction process increases surgical time, and the distal stent wires are prone to damaging the vessel wall, leading to risks of later intravascular proliferation or vascular occlusion, causing harm to the patient.

[0003] Some subsequent products add imaging markers at both ends of the stent. This method can determine the position of the distal and proximal ports of the stent. However, after the braided stent is released from the microcatheter, its diameter increases and its length decreases. The surgeon cannot accurately determine the landing point of the stent head after release in advance, and it is still impossible to release it accurately in situ. It is still necessary to release part of the stent and then pull it back for positioning.

[0004] Some products add a contrasting section to the guidewire to indicate the length of the stent after deployment, helping doctors to accurately locate the stent. This method can effectively locate the position of the stent after deployment. However, a contrasting section of a certain length can easily interfere with the visualization of the stent, making it difficult for the surgeon to clearly observe the stent deployment and affecting the surgeon's judgment. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a delivery device for an auxiliary positioning blood flow guiding mesh stent in response to the above-mentioned shortcomings.

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

[0007] A delivery device for an auxiliary positioning blood flow guiding mesh stent, the delivery device includes a protective tube and a guide wire movably disposed within the protective tube; the distal end of the guide wire has a stent placement area, and limiting blocks are respectively provided at both ends of the stent placement area, with the stent disposed between the two limiting blocks.

[0008] Furthermore, in the aforementioned delivery device for an auxiliary positioning blood flow guiding mesh stent, a first imaging marker and a second imaging marker are provided within the stent placement area.

[0009] Furthermore, in the aforementioned delivery device for an auxiliary positioning blood flow guiding mesh stent, the positions of the first imaging marker point and the second imaging marker point are the distal and proximal positions of the stent after it enters the blood vessel and expands.

[0010] Furthermore, in the aforementioned delivery device for an auxiliary positioning blood flow guiding mesh stent, the first imaging marker point and the second imaging marker point are platinum-tungsten points or platinum-iridium points.

[0011] Furthermore, in the aforementioned delivery device for an auxiliary positioning blood flow guiding mesh stent, the length of the first imaging marker and the second imaging marker along the length direction of the guide wire does not exceed 0.5 mm.

[0012] Furthermore, in the aforementioned delivery device for an auxiliary positioning blood flow guiding mesh stent, the first imaging marker and the second imaging marker are circular, elliptical, rectangular, or other irregular shapes.

[0013] The advantages and effects of this utility model are:

[0014] 1. The delivery device for the blood flow guiding mesh stent provided by this utility model belongs to the category of intravascular implantation products. This utility model is used to assist in stent positioning during the release of the blood flow guiding mesh stent, making it convenient for doctors to accurately locate the distal position of the stent. The stent can be released in situ without the need to release the stent and then pull it back for positioning, saving surgical time and avoiding the risk of damaging blood vessels.

[0015] 2. The guidewire of the delivery device provided by this utility model is equipped with two small imaging points, which can mark the distal and proximal port positions when the stent is released to the nominal diameter. Combined with the shortening rate of the stent, the position of the stent tail end after expansion can be predicted, avoiding the covering of important branch vessels, ensuring that the stent is placed in a safe position, and ensuring the safety and effectiveness of the operation. Attached Figure Description

[0016] Figure 1 This diagram shows the structural schematic of the delivery device for the auxiliary positioning blood flow guiding mesh stent provided by this utility model;

[0017] Figure 2 This diagram shows the conveying device provided by this utility model after the bracket has been added;

[0018] Figure 3 This diagram illustrates the release process of the stent being delivered to a blood vessel using the delivery device provided by this invention.

[0019] Figure 4 This diagram illustrates the delivery device provided by the present invention after the stent has been delivered to the blood vessel and released.

[0020] Explanation of reference numerals in the attached diagram: 1-protective tube, 2-guide wire, 3-support placement area, 4-first limiting block, 5-second limiting block, 6-first developing mark, 7-second developing mark, 8-support. Detailed Implementation

[0021] 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:

[0022] 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.

[0023] Figure 1 This diagram illustrates the structure of the delivery device for the auxiliary positioning blood flow guiding mesh stent provided by this invention. The delivery device includes a protective tube 1 and a guide wire 2 movably disposed within the protective tube 1. The distal end of the guide wire 2 has a stent placement area 3, and limiting blocks, namely a first limiting block 4 and a second limiting block 5, are respectively provided at both ends of the stent placement area 3. The stent 8 is disposed and constrained between the first limiting block 4 and the second limiting block 5. Figure 2 As shown, when the support 8 is placed inside the protective tube 1 with the guide wire and has not expanded, the distance between the first limiting block 4 and the second limiting block 5 is just enough to position the support 8. A first developing indicator point 6 and a second developing indicator point 7 are provided within the support placement area 3 (between the first limiting block 4 and the second limiting block 5). Figure 4As shown, the positions of the first imaging marker 6 and the second imaging marker 7 are the distal and proximal positions of the stent 8 after it enters the blood vessel and expands. Specifically, the second imaging marker 7 is located at the distal end of the stent placement area 3, close to the first limiting block 4; the first imaging marker 6 is located between the second imaging marker 7 and the second limiting block 5. Based on the stent shortening rate, the position of the stent's tail end is estimated.

[0024] This delivery device allows the operator to predict the landing point of the stent tip (distal end) after it opens, before the stent is deployed into the blood vessel, eliminating the need for distal deployment and subsequent stent retraction for positioning, thus reducing damage to the vessel wall. The operator can directly deploy the stent (in situ deployment) as needed. After the stent tip is fully opened, it can coincide with the second contrast marker 7, or the error will not exceed 2mm depending on the vessel diameter.

[0025] The first imaging marker 6 and the second imaging marker 7 are platinum-tungsten or platinum-iridium points, with a length not exceeding 0.5 mm along the guidewire. The shapes of the first imaging marker 6 and the second imaging marker 7 can be circular, elliptical, rectangular, or other irregular shapes, as long as they can effectively locate the position of the stent after release without interfering with the imaging of the stent.

[0026] 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 delivery device for an auxiliary positioning blood flow guiding mesh stent, characterized in that, The conveying device includes a protective tube (1) and a guide wire (2) movably disposed within the protective tube (1); the distal end of the guide wire (2) has a support placement area (3), and the two ends of the support placement area (3) are respectively provided with limiting blocks, and the support (8) is disposed between the two limiting blocks.

2. The delivery device for an auxiliary positioning blood flow guiding mesh stent according to claim 1, characterized in that, The bracket placement area (3) is provided with a first development mark (6) and a second development mark (7).

3. The delivery device for an auxiliary positioning blood flow guiding mesh stent according to claim 2, characterized in that, The positions of the first imaging marker (6) and the second imaging marker (7) are the distal and proximal positions of the stent (8) after it enters the blood vessel and expands.

4. The delivery device for an auxiliary positioning blood flow guiding mesh stent according to claim 2, characterized in that, The first developing marker (6) and the second developing marker (7) are platinum-tungsten or platinum-iridium points.

5. The delivery device for an auxiliary positioning blood flow guiding mesh stent according to claim 2, characterized in that, The length of the first development mark (6) and the second development mark (7) along the length direction of the guide wire does not exceed 0.5 mm.

6. The delivery device for an auxiliary positioning blood flow guiding mesh stent according to claim 2, characterized in that, The first developing marker (6) and the second developing marker (7) are circular, elliptical or rectangular in shape.

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