Three-dimensional neurointerventional catheter

Abstract

The utility model relates to a three -dimensional nerve interventional catheter, including catheter body, the first bending and second bending are formed to the catheter body far -end, the second bending is close to the far -end port, the angle alpha of first bending is 10~90 DEG, the angle beta of second bending is 10~90 DEG, the first plane that first bending is in and the second plane that second bending is in form plane angle gamma between, the plane angle gamma is -90~90 DEG, and plane angle gamma is not 0 DEG, and the development mark is set up in the catheter body far -end close to the port place, the three -dimensional nerve interventional catheter of the utility model, can make the catheter itself automatically pass through bifurcated blood vessel by the catheter structure of front end three -dimensional structure, reduces the use of guide wire or intermediate catheter, microcatheter.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a three-dimensional nerve intervention catheter. Background Technology

[0002] In neurointerventional procedures, it is often necessary to deliver a catheter to the target lesion site distal to the blood vessel to establish a pathway for diagnosis and treatment. Common sites include the basilar artery, middle cerebral artery, and anterior cerebral artery. The middle cerebral artery is a typical location for catheter placement in neurointerventions. The placement of the middle cerebral artery catheter involves entering the carotid artery from the aortic arch and then proceeding along the internal carotid artery. The overall anatomy of the carotid artery has the following characteristics: the internal carotid artery is usually very tortuous; there is an S-shaped siphon bend in the C4-C5 segment of the internal carotid artery; immediately following this bend, at the external incision, there is a bifurcation vessel, the ophthalmic artery. This means that the catheter, traveling from the right posterolateral inferior to superior position, must first pass through an S-bend, and during delivery, the catheter often becomes stuck at the bifurcation vessel, the ophthalmic artery, and cannot proceed further.

[0003] Current catheter shaping techniques, such as 25° or 45° angles, sometimes involve embedding a microguidewire within the catheter for guidance. However, due to the large gap between the catheter and the microguidewire, [see...]. Figure 1-a The "windowsill effect" exists; while this method does reduce catheter damage to the blood vessel wall, the bending is still undesirable and the effect is not ideal. It increases the difficulty for the surgeon, prolongs the operation time, and may even lead to failure in establishing surgical access, delaying the patient's optimal rescue time, thus reducing patient benefit and affecting treatment outcomes.

[0004] The current method involves using multiple catheters over the guidewire during surgery. See also Figure 1-b For example, when using a guidewire to deliver the most common 6F distal access catheter, a microcatheter is first placed over the guidewire, and then a 4F or 5F catheter is placed over the microcatheter. These two catheters are used to increase the wall thickness of the guidewire and are placed between the guidewire and the catheter. If a larger 7F or 8F distal access catheter is used, three or more catheters are needed to address the window stage effect, which not only makes the procedure more complex and prolongs the operation time, but is also uneconomical and increases the risk of the procedure. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a three-dimensional nerve intervention catheter to solve the technical problem that current nerve intervention catheters are prone to touching the ophthalmic artery, which is located in a bifurcation vessel, when passing through the tortuous internal carotid artery.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A three-dimensional nerve interventional catheter is provided, including

[0008] The catheter body has a first bend and a second bend at its distal end, with the second bend being close to the distal port.

[0009] The angle α of the first bend is 10 to 90°, and the angle β of the second bend is 10 to 90°;

[0010] The first plane where the first bend is located and the second plane where the second bend is located form a plane angle γ, wherein the plane angle γ is -90 to 90° and the plane angle γ ≠ 0°;

[0011] The imaging marker is placed at the distal end of the catheter body near the port.

[0012] Furthermore, the distance between the first bend and the distal end of the catheter body is 2 to 10 cm;

[0013] The distance between the second bend and the distal end of the catheter body is 0.5 to 2 cm.

[0014] Furthermore, the catheter body is a single-lumen tube, and the outer and inner diameters of the catheter body are the same throughout without change, or gradually decrease from near to far.

[0015] Furthermore, the total length of the catheter body is 100–135 cm;

[0016] The outer diameter of the catheter body is 1.3–2.7 mm, and the inner diameter of the catheter body is 1.0–2.3 mm.

[0017] The beneficial effects of this utility model are:

[0018] The three-dimensional nerve intervention catheter of this invention, relying on the three-dimensional structure of the catheter tip, can automatically pass through bifurcated blood vessels, reducing the use of guide wires, intermediate catheters, or microcatheters.

[0019] The rapid establishment of access channels saved on equipment and simplified procedures, further reducing surgical time. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1-a This refers to situations where traditional catheters and guidewires are obstructed when they encounter bifurcated blood vessels during delivery in blood vessels.

[0022] Figure 1-b The conventional solution involves inserting multiple intermediate catheters between the catheter and the guidewire to make them more coaxial, thus avoiding the "windowsill effect".

[0023] Figure 2-a This is a schematic diagram of the first nerve conduit of this utility model;

[0024] Figure 2-b This is a schematic diagram of the second nerve conduit of this utility model;

[0025] Figure 2-c This is a schematic diagram of the third type of nerve conduit of this utility model;

[0026] Figure 2-d This is a schematic diagram of the fourth type of nerve conduit of this utility model;

[0027] Figure 2-e This is a schematic diagram of the fifth type of nerve conduit of this utility model;

[0028] Figure 2-f This is a schematic diagram of the sixth type of nerve conduit of this utility model;

[0029] Figure 2-g This is a schematic diagram of the seventh type of nerve conduit of this utility model;

[0030] Figure 2-h This is a schematic diagram of the eighth nerve conduit of this utility model;

[0031] Figure 3-a It is a cross-sectional view of a catheter or guidewire being transported in a blood vessel and encountering obstruction at a bifurcation point.

[0032] Figure 3-b This is a cross-sectional view of the three-dimensional shaped nerve conduit of this utility model when it avoids bifurcated blood vessels in the left direction during delivery;

[0033] Figure 3-c This is a cross-sectional view of the three-dimensional shaped nerve conduit of this utility model when it avoids bifurcated blood vessels in the right direction during delivery;

[0034] Figure 4 This is a frontal view of the three-dimensional shaped nerve conduit of this utility model when avoiding bifurcated blood vessels during delivery.

[0035] Among them, 1. catheter body, 2. first bend, 3. second bend, 4. contrast marker. Detailed Implementation

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

[0037] This application provides a three-dimensional neural interventional catheter, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0038] To address the technical problem in existing neurointerventional catheters that easily encounter the ophthalmic artery, which is located at a bifurcation, when passing through the tortuous internal carotid artery, one embodiment of this application provides a three-dimensional neurointerventional catheter. This is described in detail below.

[0039] like Figures 2-a to 2-h As shown, a three-dimensional nerve intervention catheter includes...

[0040] The catheter body 1 has a first bend 2 and a second bend 3 formed at its distal end, with the second bend 3 being close to the distal port;

[0041] The angle α of the first bend 2 is 10 to 90°, and the angle β of the second bend 3 is 10 to 90°;

[0042] The first plane where the first bend 2 is located and the second plane where the second bend 3 is located form a plane angle γ, the plane angle γ is -90 to 90°, and the plane angle γ ≠ 0°;

[0043] The imaging marker 4 is located at the distal end of the catheter body 1 near the port.

[0044] In this embodiment, when the plane angle γ = 0°, the first bend 2 and the second bend 3 of the conduit are both within the first plane, that is, it is not a three-dimensional structure.

[0045] Specifically, as an optional implementation in this embodiment, the distance between the first bend 2 and the distal port of the catheter body 1 is 2 to 10 cm;

[0046] The distance between the second bend 3 and the distal end of the catheter body 1 is 0.5 to 2 cm.

[0047] Specifically, as an optional implementation in this embodiment, the catheter body 1 is a single-lumen tube, and the outer diameter and inner diameter of the catheter body 1 are the same and unchanged throughout the entire length, or gradually decrease from near to far.

[0048] Specifically, as an optional implementation in this embodiment, the total length of the catheter body 1 is 100-135cm;

[0049] The outer diameter of the catheter body 1 is 1.3 to 2.7 mm, and the inner diameter of the catheter body 1 is 1.0 to 2.3 mm.

[0050] In actual anatomical structures, the diameter of the distal end of the internal carotid artery is 4.5–5.5 mm, and the diameter of the ophthalmic artery is 1.5–2 mm. When the outer diameter of the ductus artery is 1.3–2.7 mm, it indicates that the ductus artery has sufficient room to move within the internal carotid artery.

[0051] In this embodiment, the method for pre-shaping the catheter is as follows: the catheter is placed in a shape mold and heated at a temperature ranging from 80 to 200°C for 1-10 minutes. After complete cooling, the catheter is removed.

[0052] In this embodiment, the catheter typically has a three-layer structure. The catheter uses existing, mature catheters and comprises three layers: an inner wall with a smooth coating, made of materials such as PTFE, nylon, Pebax, HDPE, or modified PTFE; a middle layer with metal reinforcement, which can be a helical spring, laser-cut, or metal braided, with the wire material being stainless steel, nickel-titanium, tungsten, etc.; and an outer layer composed of multiple segments of polymer materials with varying hardness, such as nylon, Pebax, or TPU polyurethane. The hardness ranges from Shore A 15A to 90D, with the material hardness gradually decreasing from near to far, or slightly harder at the distal end.

[0053] In this embodiment, the outermost layer of the catheter can be coated with a hydrophilic or hydrophobic coating to reduce friction in the blood vessel and facilitate delivery. The hydrophilic coating is made of PVP.

[0054] In this embodiment, the developing mark 4 can be an independent end piece made of a radiopaque metal such as platinum-iridium, platinum, or tungsten. Alternatively, a developing agent, such as barium sulfate or a component containing tungsten or bismuth, can be added to the outer polymer material at the distal end.

[0055] The three-dimensional nerve intervention catheter of this utility model is preferably available in the following eight styles;

[0056] Section 1: See also Figure 2-a As shown, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, and the plane angle γ is 45°;

[0057] Section Two: See also Figure 2-b As shown, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, and the plane angle γ is 90°;

[0058] Section 3: See also Figure 2-c As shown, the angle α of the first bend 2 is 90°, the angle β of the second bend 3 is 90°, and the plane angle γ is 45°;

[0059] Section 4: See Figure 2-d As shown, the angle α of the first bend 2 is 90°, the angle β of the second bend 3 is 90°, and the plane angle γ is 90°;

[0060] Section 5: See Figure 2-e As shown, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, and the plane angle γ is -45°;

[0061] Section 6: See Figure 2-f As shown, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, and the plane angle γ is -90°;

[0062] Section 7: See Figure 2-g As shown, the angle α of the first bend 2 is 90°, the angle β of the second bend 3 is 90°, and the plane angle γ is -45°;

[0063] Article 8: See Figure 2-h As shown, the angle α of the first bend 2 is 90°, the angle β of the second bend 3 is 90°, and the plane angle γ is -90°;

[0064] The above eight neurointerventional catheters should be selected based on the actual surgical needs. First, observe the tortuous shape of the internal carotid artery, whether it is in the same plane, and the specific location of the ophthalmic artery at the angle of the tortuous vessel, based on the anatomical structure of the cerebral blood vessels, such as CTA, MRA, or DSA images.

[0065] Choose a suitable three-dimensional shaped catheter. The selection method is as follows: the first bend 2 should match the first bend 2 of the blood vessel as closely as possible, and the second bend 3 should be larger than the second bend 3 of the blood vessel. The angle between the two bending planes should be chosen as far as possible in the opposite direction to the location of the ophthalmic artery to avoid contact with it.

[0066] For example:

[0067] Assuming vascular anatomy, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, the plane angle γ is 15°, and the ophthalmic artery is located slightly to the left. When selecting a catheter, the angle α of the first bend 2 must be 45°, the angle β of the second bend 3 must be greater than 45°, and the plane angle must be less than -15° or greater than 45°, meaning the difference must be greater than 30°.

[0068] Assuming vascular anatomy, the angle α of the first bend 2 is 45°, the angle β of the second bend 3 is 45°, the plane angle γ is 0°, and the ophthalmic artery is located slightly to the left. When selecting a catheter, the angle α of the first bend 2 must be 45°, the angle β of the second bend 3 must be greater than 45°, and the plane angle must be less than -30° or greater than 30°.

[0069] When selecting a catheter, the angle γ of the plane is often more important. The sign of the angle γ is mainly based on the fact that the directions of the left and right internal carotid arteries in the brain are completely opposite. Next are the angles β of the second bend 3 and α of the first bend 2.

[0070] Instructions for using neurointerventional catheters:

[0071] Following the original surgical procedure, the catheter's position is monitored in real time using imaging marker 4. Under normal circumstances, pushing the three-dimensional shaped nerve catheter will smoothly pass through the ophthalmic artery. If jamming occurs, gently rotate the proximal seat of the catheter. Because the catheter is reinforced with a metal wire inside, it has corresponding torsional control, and the distal end will follow the rotation. Then, push the catheter again, and it can smoothly pass through the tortuous and narrow bifurcation of the cerebral blood vessels. If it still cannot pass, the catheter can be withdrawn, and the shaping angle can be readjusted using steam shaping as needed.

[0072] All the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0073] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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.

[0074] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are 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 of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0076] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0077] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0078] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-dimensional neurointerventional catheter, characterized by, Comprising a catheter body, the catheter body distal end forms a first bend and a second bend, the second bend is close to the distal end port; the angle of the first bend α is 10-90°, the angle of the second bend β is 10-90°; the first plane where the first bend is located and the second plane where the second bend is located form a plane angle γ, the plane angle γ is -90-90°, and the plane angle γ≠0°; a developing mark is arranged on the catheter body distal end close to the port.

2. The three-dimensional nerve interventional catheter according to claim 1, wherein the distance of the first bend from the distal end port of the catheter body is 2-10 cm; the distance of the second bend from the distal end port of the catheter body is 0.5-2 cm.

3. The three-dimensional nerve interventional catheter according to claim 1, wherein the catheter body is a single-lumen tube, and the outer diameter and the inner diameter of the catheter body are the same without change throughout the whole tube, or gradually decrease from proximal to distal.

4. The three-dimensional nerve interventional catheter according to claim 1, wherein the total length of the catheter body is 100-135 cm; the outer diameter of the catheter body is 1.3-2.7 mm, and the inner diameter of the catheter body is 1.0-2.3 mm.

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