Improved coronary artery stent conveying extension catheter

Abstract

The utility model discloses an improved coronary artery stent conveying extension catheter. The improved coronary artery stent conveying extension catheter comprises a catheter body and a progressive inner core. The catheter body is of a cylindrical hollow flexible tubular structure, the length ranges from 2 cm to 3 cm, the outer diameter ranges from 1.7 mm to 1.8 mm, and the wall thickness ranges from 0.2 mm to 0.3 mm. A main body of the progressive inner core is of a solid flexible columnar structure, the head end of the progressive inner core is machined into a tapered conical part, the total length of the progressive inner core is 50-60 cm, the diameter of the progressive inner core is 0.5-1 mm, and the length of the conical head end is 1-1.5 cm; the gradual inner core is inserted into the tubular structure of the catheter body, and the conical head end extends out of the far-end opening of the catheter body to form the extension catheter.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment and relates to an improved coronary artery stent delivery extension catheter. Background Art

[0002] During coronary intervention, coronary extension catheters or extension catheters are used as an important delivery auxiliary device, which are widely used to help stents pass through narrow or complex lesion areas. However, the existing extension catheter design is usually long (about 30 cm or longer). Although this length design can provide sufficient support to stabilize the advancement of the catheter and stent, it has exposed some significant defects in actual clinical applications. First, after the catheter enters the coronary artery, especially when passing through the target lesion (such as severe stenosis or calcification area), its longer distal part can easily lead to local blood flow obstruction, causing severe ischemia of the coronary artery. Even if the catheter is designed with side holes to maintain the passage of collateral blood flow, it cannot completely avoid ischemia of the distal tissue. Patients may experience obvious ischemic symptoms during the operation, such as chest pain, abnormal electrocardiogram, and even hemodynamic instability, which seriously affects the safety and effectiveness of the operation.

[0003] In addition, the existing extension catheters still have significant deficiencies in passability when dealing with some complex coronary lesions. In the face of severely calcified lesions, the catheter often encounters significant resistance during the pushing process, which greatly reduces the success rate of the catheter passing through the lesion. In order to improve this situation, it is usually necessary to use technologies such as balloon dilatation to help the catheter and stent pass through narrow or calcified areas. However, the balloon dilatation process may increase the risk of damage to the blood vessel wall, and in some cases, even with balloon assistance, some lesions still cannot pass smoothly, and stent unloading may occur, causing vascular complications, which in turn leads to operation failure or prolonged operation time. In addition, balloon assistance also increases the complexity of the operation and the patient's discomfort during the operation.

[0004] Therefore, there is an urgent need for a new extension catheter design that can effectively shorten the catheter length to reduce the risk of distal ischemia, while also improving the catheter's ability to navigate complex lesions through optimized structural and material design. Such an improvement would help reduce surgical risks, improve the success rate of stent delivery and patient prognosis, and ultimately achieve better clinical outcomes in coronary intervention. Utility Model Content

[0005] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide an improved coronary stent delivery extension catheter for assisting the delivery of the stent during coronary intervention.

[0006] The utility model provides an improved coronary artery stent delivery extension catheter, the extension catheter comprising: a catheter body, a progressive inner core;

[0007] The catheter body is a cylindrical hollow flexible tubular structure with a length of 2-3 cm, preferably 3 cm; the outer diameter of the catheter body is 1.7-1.8 mm, preferably 1.7 mm; the wall thickness is 0.2-0.3 mm, preferably 0.2 mm.

[0008] The main body of the progressive inner core is a solid flexible cylindrical structure, and the head end is processed into a tapered conical part. The total length of the inner core is 50-60 cm, preferably 50 cm; the diameter of the inner core is 0.5-1 mm, preferably 1 mm; the length of the tapered head end is 1-1.5 cm, preferably 1 cm;

[0009] The progressive inner core is inserted into the tubular structure of the catheter body, and the tapered head extends from the distal opening of the catheter body to form the extension catheter;

[0010] The proximal and distal ends of the catheter body are both located in the coronary artery, and the overall length is designed to reduce the risk of blood flow obstruction and ischemia, ensuring the continuity and stability of coronary blood flow during the operation.

[0011] In a specific embodiment, both end openings of the catheter body and the proximal end of the progressive inner core are provided with conical or arc-shaped chamfers at the openings or ends, thereby reducing the friction and damage to the inner wall of the blood vessel during the insertion and withdrawal of the extension catheter into the coronary artery, thereby further improving the passability of the catheter.

[0012] In one embodiment, the size of the distal opening of the catheter body is slightly smaller than the main body diameter of the progressive inner core, and when the tapered head end of the progressive inner core extends from the distal opening of the catheter body, the inner core body does not extend from the distal opening; the inner diameter of the catheter body is slightly larger than the diameter of the inner core body;

[0013] In one embodiment, the inner diameter of the catheter body is 0.1 mm larger than the diameter of the progressive inner core, ensuring that the progressive inner core can rotate and move freely within the catheter body, while providing sufficient clearance to reduce friction and ensuring smooth advancement of the catheter during operation.

[0014] In a specific embodiment, a flexible but rigid solid body traction wire is fixedly provided on the outer wall of the catheter body along the length direction, one end of the body traction wire covers part or all of the outer wall of the catheter body in the length direction, and the other end continues to extend beyond the end of the catheter body; the total length of the body traction wire fixed on the outer wall of the catheter body is 150-160 cm, preferably 150 cm; the diameter of the body traction wire is 0.5-0.6 mm, preferably 0.5 mm;

[0015] During use, the body traction wire is used to, on the one hand, provide stable traction for the catheter body, maintain the stability of the catheter body when the progressive inner core is pulled out, and prevent the catheter body from being pulled out at the same time as the progressive inner core is pulled out; on the other hand, the catheter body can be easily removed from the body by pulling the body traction wire.

[0016] In a specific embodiment, a solid inner core traction wire that is flexible but has a certain rigidity is fixedly provided on the outer wall of the progressive inner core along the length direction, one end of the inner core traction wire covers part or all of the outer wall of the progressive inner core in the length direction, and the other end continues to extend beyond the end of the progressive inner core; the total length of the inner core traction wire fixed on the outer wall of the progressive inner core is 150-160 cm, preferably 150 cm; the diameter of the inner core traction wire is 0.5-0.6 mm, preferably 0.5 mm;

[0017] During use, the inner core pulling wire is used to pull the progressive inner core out from the interior of the catheter body after the extension catheter is placed at a designated position.

[0018] An anti-slip texture is provided on the outer surface of the main body traction wire or the inner core traction wire, which can provide better grip and control when withdrawing the catheter body or the progressive inner core; in a specific embodiment, the anti-slip texture can be a spiral shape, a mesh groove or other structural form to meet the needs during use.

[0019] In one embodiment, a manual screw device is fixedly provided at the proximal end of the progressive inner core. The manual screw device is ergonomically designed, allowing the operator to more accurately control the rotation direction and speed of the inner core. The progressive inner core is screwed into the catheter body and extended from the distal opening of the catheter body, so that the inner core can rotate during the advancement of the catheter, providing additional torque to overcome the resistance of the coronary artery lesion area and enhance the advancement ability of the extension catheter.

[0020] The outer surface of the progressive inner core is a smooth structure, which reduces friction with the inner wall of the catheter body during rotation, thereby ensuring smooth rotation and improving passability, while avoiding pulling out the catheter body when withdrawing the progressive inner core.

[0021] In a specific embodiment, reference can also be made to existing extension catheter-related products, and one or more through holes are also provided on the outer wall of the catheter body. The through holes are evenly or unevenly distributed along the length direction of the catheter body. These through holes are used to reduce the blood flow resistance when the catheter is inserted into the coronary artery, ensure the passage of collateral blood flow, and maintain hemodynamic stability.

[0022] In a specific embodiment, the outer surface of the catheter body may also be provided with one or more radioactive markers, which are evenly or unevenly distributed along the length of the catheter body, so as to facilitate real-time monitoring of the position and direction of the catheter through image guidance during the interventional operation and ensure the accuracy of the operation.

[0023] The beneficial effects of the present invention include: the improved coronary stent delivery extension catheter in the present invention has significant structural advantages and clinical application effects compared to existing extension catheter products. First, by shortening the length of the catheter body to 2-3 cm and ensuring that both its proximal and distal ends are located within the coronary artery, the risk of blood flow obstruction and ischemia is greatly reduced, and the stability of hemodynamics is improved. Secondly, the progressive inner core of the extension catheter of the present invention adopts a rotary structural design, and by being equipped with a manual spiral device, the progressive inner core can generate additional rotational torque during the advancement process, thereby making it easier to pass through narrow or calcified lesion areas, significantly enhancing the passability of the catheter. In addition, a body traction wire is fixed to the outer wall of the catheter body, and an inner core traction wire is fixed to the outer wall of the progressive inner core. The body traction wire can cooperate with the inner core traction wire to prevent the catheter body from being brought out when the progressive inner core is pulled out, and can also provide stable traction when the catheter is subsequently pulled out, ensuring that the extension catheter remains accurately positioned during the operation and prevents position displacement. In summary, this improved extension catheter significantly improves the safety, effectiveness and patient comfort of surgical procedures through multiple structural innovations, providing a more optimized solution for coronary artery interventional treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the catheter body of the extension catheter of the utility model.

[0026] Figure 2 It is a schematic diagram of the progressive inner core structure of the extension catheter of the utility model.

[0027] Figure 3 It is a schematic diagram of the structure of the extension catheter of the utility model.

[0028] Figure 4 This is a schematic structural diagram of an extension conduit with a through hole in an embodiment of the present utility model.

[0029] In the figure, 1-catheter body, 11-through hole, 2-progressive inner core, 21-conical head end, 3-body traction wire, 4-inner core traction wire, 5-manual spiral device. DETAILED DESCRIPTION

[0030] The utility model is further described in detail with reference to the following specific embodiments and drawings. The processes, conditions, experimental methods, etc. for implementing the utility model, except for those specifically mentioned below, are common knowledge and common common sense in the field and are not particularly limited by the present utility model.

[0031] This utility model addresses the issues of existing extension catheters that can cause hemodynamic instability and make some lesions difficult to access, and offers two design improvements: 1. The length of the extension catheter is shortened from the current 30cm to 2-3cm. This allows the proximal opening to enter the coronary artery after the distal end of the extension catheter enters the coronary artery, completely avoiding the severe ischemia at the distal end of the extension catheter in existing products. 2. A progressive inner core is designed within the extension catheter. Unlike the inner cores of existing extension catheters, this inner core has a manual spiral device at its proximal end, allowing the operator to rotate the distal end of the inner core while pushing the extension catheter and inner core together, thereby enhancing the overall ability of the extension catheter to pass through the target lesion.

[0032] The innovations of the present invention mainly include the following: 1. The length of the delivery sheath (i.e., the catheter body) is greatly shortened, thereby avoiding the disadvantage of severe insufficient perfusion of the distal vascular after the delivery sheath (catheter body) enters the coronary artery, thereby ensuring surgical safety.

[0033] 2. The ability of the entire extension catheter to pass through the lesion is greatly improved by arranging a manual spiral device at the proximal end and the gradual design of the distal end (head end) of the progressive inner core.

[0034] Example 1

[0035] This embodiment provides an improved coronary stent delivery extension catheter, the extension catheter comprising: a catheter body, a progressive inner core, such as Figure 1-3As shown;

[0036] The catheter body is a cylindrical hollow flexible tubular structure with a length of 2 cm; the outer diameter of the catheter body is 1.8 mm; the wall thickness is 0.2 mm; the main body of the progressive inner core is a solid flexible cylindrical structure with a head end processed into a tapered portion, the total length of the inner core is 60 cm; the diameter of the inner core is 0.9 mm; the length of the tapered portion is 1.2 cm; the inner diameter of the catheter body is 0.1 mm larger than the diameter of the progressive inner core;

[0037] The progressive inner core is inserted into the catheter body, and the tapered tip is extended from the distal end opening of the catheter body to form the extension catheter of the present utility model;

[0038] A flexible but rigid solid body traction wire is fixedly provided on the outer wall of the catheter body along its length, one end of the body traction wire covers part or all of the outer wall of the catheter body along its length, and the other end continues to extend beyond the end of the catheter body; the total length of the body traction wire fixed on the outer wall of the catheter body is 150 cm; the diameter of the body traction wire is 0.5 mm;

[0039] A flexible but rigid solid inner core traction wire is fixedly provided on the outer wall of the progressive inner core along the length direction, one end of the inner core traction wire covers part or all of the outer wall of the progressive inner core in the length direction, and the other end continues to extend beyond the end of the progressive inner core; the total length of the inner core traction wire fixed on the outer wall of the progressive inner core is 155 cm; the diameter of the inner core traction wire is 0.5 mm;

[0040] When the extension catheter of the present invention is in use, the proximal and distal ends of the catheter body are both located within the coronary artery. The overall length is designed to reduce the risk of blood flow obstruction and ischemia, ensuring the continuity and stability of coronary blood flow during surgery.

[0041] During use, the body traction wire is used to, on the one hand, provide a stable traction force for the catheter body, maintain the stability of the catheter body when the progressive inner core is withdrawn, and prevent the catheter body from being pulled out simultaneously with the withdrawal of the progressive inner core; on the other hand, the catheter body can be conveniently removed from the body by pulling the body traction wire;

[0042] During use, the inner core pulling wire is used to pull the progressive inner core out from the interior of the catheter body after the extension catheter is placed at a designated position.

[0043] Example 2

[0044] This embodiment provides an improved coronary stent delivery extension catheter, the extension catheter comprising: a catheter body, a progressive inner core, such as Figure 1-3 As shown;

[0045] The catheter body is a cylindrical hollow flexible tubular structure with a length of 2.5 cm; the outer diameter of the catheter body is 1.7 mm; the wall thickness is 0.3 mm; the main body of the progressive inner core is a solid flexible cylindrical structure with a head end processed into a tapered portion, the total length of the inner core is 50 cm; the diameter of the inner core is 0.9 mm; the length of the tapered portion is 1.3 cm; the inner diameter of the catheter body is 0.1 mm larger than the diameter of the progressive inner core;

[0046] The progressive inner core is inserted into the catheter body, and the tapered tip is extended from the distal end opening of the catheter body to form the extension catheter of the present utility model;

[0047] A flexible but rigid solid body traction wire is fixedly provided on the outer wall of the catheter body along its length, one end of the body traction wire covering part or all of the outer wall of the catheter body in its lengthwise direction, and the other end extending beyond the end of the catheter body; the total length of the body traction wire fixed on the outer wall of the catheter body is 160 cm; the diameter of the body traction wire is 0.6 mm;

[0048] A solid inner core traction wire that is flexible but has a certain rigidity is fixedly provided on the outer wall of the progressive inner core along the length direction, one end of the inner core traction wire covers part or all of the outer wall of the progressive inner core in the length direction, and the other end continues to extend beyond the end of the progressive inner core; the total length of the inner core traction wire fixed on the outer wall of the progressive inner core is 150 cm; the diameter of the inner core traction wire is 0.5 mm;

[0049] A manual screw device is fixedly provided at the proximal end of the progressive inner core. The design of the manual screw device conforms to the ergonomic shape, allowing the operator to more accurately control the rotation direction and speed of the inner core. The progressive inner core is screwed into the catheter body and extended from the distal opening of the catheter body, so that the inner core can rotate during the advancement of the catheter, providing additional torque to overcome the resistance of the coronary artery disease area and enhance the advancement ability of the extension catheter.

[0050] Example 3

[0051] This embodiment provides an improved coronary stent delivery extension catheter, the extension catheter comprising: a catheter body, a progressive inner core, such as Figure 4 As shown;

[0052] The catheter body is a cylindrical hollow flexible tubular structure with a length of 2.7 cm; the outer diameter of the catheter body is 1.7 mm; the wall thickness is 0.2 mm; the main body of the progressive inner core is a solid flexible cylindrical structure with a head end processed into a tapered portion, the total length of the inner core is 50 cm; the diameter of the inner core is 0.8 mm; the length of the tapered portion is 1.1 cm; the inner diameter of the catheter body is 0.1 mm larger than the diameter of the progressive inner core;

[0053] The progressive inner core is inserted into the catheter body, and the tapered tip is extended from the distal end opening of the catheter body to form the extension catheter of the present utility model;

[0054] A flexible but rigid solid body traction wire is fixedly provided on the outer wall of the catheter body along its length, one end of the body traction wire covering part or all of the outer wall of the catheter body in its lengthwise direction, and the other end extending beyond the end of the catheter body; the total length of the body traction wire fixed on the outer wall of the catheter body is 160 cm; the diameter of the body traction wire is 0.5 mm;

[0055] A solid inner core traction wire that is flexible but has a certain rigidity is fixedly provided on the outer wall of the progressive inner core along the length direction, one end of the inner core traction wire covers part or all of the outer wall of the progressive inner core in the length direction, and the other end continues to extend beyond the end of the progressive inner core; the total length of the inner core traction wire fixed on the outer wall of the progressive inner core is 150 cm; the diameter of the inner core traction wire is 0.6 mm;

[0056] One or more through holes are provided on the outer wall of the catheter body, and the through holes are evenly or unevenly distributed along the length of the catheter body. These through holes are used to reduce blood flow resistance when the catheter is inserted into the coronary artery, ensure the passage of collateral blood flow, and maintain hemodynamic stability.

[0057] Example 4

[0058] This embodiment provides an improved coronary stent delivery extension catheter, the extension catheter comprising: a catheter body, a progressive inner core;

[0059] The catheter body is a cylindrical hollow flexible tubular structure with a length of 2.2 cm; the outer diameter of the catheter body is 1.8 mm; the wall thickness is 0.2 mm; the main body of the progressive inner core is a solid flexible cylindrical structure with a head end processed into a tapered portion, the total length of the inner core is 60 cm; the diameter of the inner core is 0.8 mm; the length of the tapered portion is 1.5 cm; the inner diameter of the catheter body is 0.1 mm larger than the diameter of the progressive inner core;

[0060] The progressive inner core is inserted into the catheter body, and the tapered tip is extended from the distal end opening of the catheter body to form the extension catheter of the present utility model;

[0061] A flexible but rigid solid body traction wire is fixedly provided on the outer wall of the catheter body along its length, one end of the body traction wire covering part or all of the outer wall of the catheter body along its length, and the other end extending beyond the end of the catheter body; the total length of the body traction wire fixed on the outer wall of the catheter body is 155 cm; the diameter of the body traction wire is 0.5 mm;

[0062] A solid inner core traction wire that is flexible but has a certain rigidity is fixedly provided on the outer wall of the progressive inner core along the length direction, one end of the inner core traction wire covers part or all of the outer wall of the progressive inner core in the length direction, and the other end continues to extend beyond the end of the progressive inner core; the total length of the inner core traction wire fixed on the outer wall of the progressive inner core is 150 cm; the diameter of the inner core traction wire is 0.6 mm;

[0063] The outer surface of the catheter body may also be provided with one or more radioactive markers, which are evenly or unevenly distributed along the length of the catheter body, to facilitate real-time monitoring of the position and direction of the catheter through image guidance during the interventional operation to ensure operational accuracy.

[0064] In the description of this application, it should be understood that the orientations or positional relationships indicated in the text are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0065] Many different embodiments or examples are provided in the present invention to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art will appreciate the application of other processes and / or the use of other materials.

[0066] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, any changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the appended claims.

Claims

1. An improved coronary stent delivery extension catheter, characterized in that: The extension catheter comprises: a catheter body (1), a progressive inner core (2); The catheter body (1) is a cylindrical hollow flexible tubular structure with a length of 2-3 cm, an outer diameter of 1.7-1.8 mm, and a wall thickness of 0.2-0.3 mm; the main body of the progressive inner core (2) is a solid flexible columnar structure, and the head end is processed into a tapered portion. The total length of the progressive inner core (2) is 50-60 cm, the diameter is 0.5-1 mm, and the length of the tapered head end (21) is 1-1.5 cm; The progressive inner core (2) is inserted into the tubular structure of the catheter body (1), and the tapered head end (21) extends from the distal end opening of the catheter body (1) to form the extension catheter.

2. The extension catheter according to claim 1, wherein The distal opening of the catheter body (1) is smaller than the main body diameter of the progressive inner core (2), and when the tapered head end (21) of the progressive inner core extends from the distal opening of the catheter body (1), the inner core body does not extend from the distal opening; the inner diameter of the catheter body (1) is larger than the main body diameter of the progressive inner core (2); and / or, Both ends of the catheter body (1) are open, and the proximal end of the progressive inner core (2) is provided with conical or arc-shaped chamfers at the opening and / or end.

3. The extension catheter according to claim 2, wherein: The inner diameter of the catheter body (1) is 0.1 mm larger than the diameter of the progressive inner core (2).

4. The extension catheter according to claim 1, wherein: A solid body traction wire (3) is fixedly provided on the outer wall of the catheter body (1) along the length direction, one end of the body traction wire (3) covers part or all of the outer wall of the catheter body (1) in the length direction, and the other end continues to extend beyond the end of the catheter body (1); the total length of the body traction wire (3) fixed on the outer wall of the catheter body (1) is 150-160 cm; the diameter of the body traction wire (3) is 0.5-0.6 mm.

5. The extension catheter according to claim 4, wherein: The outer surface of the main body traction wire (3) is processed and provided with anti-slip texture.

6. The extension catheter according to claim 1, wherein: A solid inner core traction wire (4) is fixedly arranged on the outer wall of the progressive inner core (2) along the length direction, one end of the inner core traction wire (4) covers part or all of the outer wall of the progressive inner core (2) in the length direction, and the other end continues to extend beyond the end of the progressive inner core (2); the total length of the inner core traction wire (4) fixed on the outer wall of the progressive inner core (2) is 150-160 cm; the diameter of the inner core traction wire (4) is 0.5-0.6 mm.

7. The extension catheter according to claim 6, wherein: The outer surface of the inner core traction wire (4) is processed and provided with anti-slip texture.

8. The extension catheter according to claim 5 or 7, wherein: The anti-slip texture is a spiral or mesh groove.

9. The extension catheter according to claim 5, wherein: A manual screw device (5) is fixedly provided at the proximal end of the inner core traction wire (4) of the progressive inner core, and the manual screw device (5) is rotated to screw into the progressive inner core (2).

10. The extension catheter according to claim 1, wherein One or more through holes are provided on the outer wall of the catheter body (1), and the through holes are evenly or unevenly distributed along the length direction of the catheter body (1).

11. The extension catheter according to claim 1, wherein One or more radioactive markers are provided on the outer surface of the catheter body (1), and the radioactive markers are evenly or unevenly distributed along the length direction of the catheter body.

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