A hollow guide wire

Abstract

The utility model relates to a kind of hollow guide wire, including guide wire body, the first development mark is set in guide wire body terminal;Bulge body, the bulge body is set in guide wire body distal end, second development mark is set in the bulge body;The guide wire body is worn in bulge body, and coaxial setting is done between guide wire body;The maximum diameter in the middle of the bulge body, gradually decrease both ends.In the guide wire setting bulge, when cooperating with catheter, the efficiency of catheter over bending and over bifurcated blood vessel is improved, the phenomenon of being stuck is reduced.It is convenient to operate, shortens the length of time of operation to establish passage.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a hollow guidewire. Background Technology

[0002] like Figure 1 As shown, during vascular interventional surgery, a guidewire is often used to guide catheter 1 to the target lesion site distal to the blood vessel to establish a diagnostic and treatment pathway. However, when encountering a thin and tortuous blood vessel with branch vessels 22, and the branch vessels 22 are located precisely in the direction of the outward curve of the main vessel 21, the guidewire becomes eccentric within the catheter 1 due to the larger diameter of the guidewire's inner lumen. This creates a large gap between the catheter 1 and the guidewire, which appears as a large "windowsill" in cross-section. When catheter 1 is advanced along the guidewire, it may deviate to one side and scrape against the main vessel 21. When encountering a branch vessel, it is easily stuck, preventing further advancement. This phenomenon is clinically known as the "windowsill effect."

[0003] Especially during neurointerventional surgery, the internal carotid artery is often very tortuous. When the catheter is pushed to the end of the internal carotid artery along the guidewire, the bifurcation ophthalmic artery is the only way for the catheter to be delivered to the distal part of the middle cerebral artery in anterior circulation interventional surgery. The catheter tip is very likely to get stuck here, which increases the difficulty of the operation for the surgeon, prolongs the operation time, and may even lead to failure to establish the surgical access, delaying the patient's best rescue time, thereby reducing the patient's benefit and affecting the treatment effect.

[0004] Chinese patent CN117982777A discloses a guidewire system with a balloon. While this guidewire adds a balloon at the distal end to locally increase the diameter and address the window sill effect, the added balloon requires fluid infusion, necessitating a proximal connector and increasing surgical complexity. Furthermore, the fluid-filled balloon does not appear more flexible, potentially making catheter guidance less smooth, and the guidewire's distal length cannot be controlled. This results in the loss of the opportunity to continue delivering the microguidewire.

[0005] like Figure 2 As shown, the existing method involves using multiple catheters over the guidewire during surgery. For example, when using guidewire 3 to deliver the most common 6F distal access catheter, a microcatheter 11 is first placed over the guidewire, and then a 4F or 5F catheter is placed over the microcatheter 11. These two catheters are used to increase the wall thickness of guidewire 3, and are placed between guidewire 3 and catheter 1. If a larger 7F or 8F distal access catheter is used, three or more catheters are needed to address the window effect, which not only makes the surgery more complex and prolongs the operation time, but is also uneconomical and increases the risk of surgery. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a hollow guidewire that makes the operation more complicated, prolongs the operation time, is uneconomical and increases the technical problems of the operation when dealing with the "windowsill effect".

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] First aspect:

[0009] Provides a hollow guidewire, including

[0010] A guidewire body, wherein a first radiopaque marker is provided at the end of the guidewire body;

[0011] A bulge body is disposed at the distal end of the guidewire body, and a second imaging marker is disposed within the bulge body;

[0012] The guidewire body is inserted into the bulge and is coaxially arranged with the guidewire body.

[0013] The bulge has the largest diameter in the middle and gradually decreases at both ends.

[0014] Furthermore, the guidewire body has a through-hole single-lumen channel inside.

[0015] Furthermore, the diameter of the bulge at its maximum point in the middle is 0.4–4 mm, and its length is 5–50 mm.

[0016] Furthermore, the outer diameter of the guidewire body is 0.035–0.085 mm, and its inner diameter is 0.010–0.030 mm.

[0017] Furthermore, the bulge is a double-conical structure that is larger in the middle and smaller at both ends, or an elliptical structure.

[0018] The second aspect:

[0019] A method for using the hollow guidewire described above is provided. During surgery, the operator first controls the hollow guidewire to move a certain distance within the cerebral blood vessel. The position of the hollow guidewire is monitored in real time by using contrast markers to ensure that the axis of the hollow guidewire coincides with the axis of the cerebral blood vessel until the bulge reaches the bifurcation of the cerebral blood vessel. The hollow guidewire is then observed by using a second contrast marker to prevent it from entering the bifurcation vessel.

[0020] The catheter is guided along the path established by the hollow guidewire. When the catheter is advanced to the tortuous and narrow bifurcation of the distal cerebral blood vessel, the cross-section of the catheter and the cross-section of the cerebral blood vessel are concentric rings. That is, the end wall of the catheter will not be hooked by the bifurcation of the cerebral blood vessel, so that the catheter can pass smoothly through the tortuous and narrow bifurcation of the cerebral blood vessel.

[0021] Continue pushing the catheter until it reaches the preset position, then withdraw the hollow guidewire.

[0022] Third aspect:

[0023] A method for using the hollow guidewire described above is provided. During surgery, the operator first inserts the hollow guidewire into the catheter, with the bulge of the hollow guidewire positioned at the end of the catheter.

[0024] The catheter containing the hollow guidewire is then moved within the cerebral blood vessel. The position of the catheter and hollow guidewire is monitored in real time using contrast markers to ensure that the axis of the catheter and hollow guidewire coincides with the axis of the cerebral blood vessel until the bulge reaches the bifurcation of the cerebral blood vessel. A second contrast marker is used to observe and prevent the catheter and hollow guidewire from entering the bifurcation vessel.

[0025] Continue to advance the catheter and hollow guidewire. When the catheter is advanced to the tortuous and narrow bifurcation of the distal cerebral blood vessel, the cross-section of the catheter and the cross-section of the cerebral blood vessel are concentric rings. That is, the end wall of the catheter will not be hooked by the bifurcation of the cerebral blood vessel, so that the catheter can pass smoothly through the tortuous and narrow bifurcation of the cerebral blood vessel.

[0026] Continue pushing the catheter until it reaches the preset position, then withdraw the hollow guidewire.

[0027] Fourth aspect:

[0028] A method for using the hollow guidewire described above is provided. During surgery, the operator first controls the catheter to move a certain distance within the cerebral blood vessel. The position of the catheter is monitored in real time by the contrast markers on the catheter. If the catheter passes smoothly through the bifurcation vessel, there is no need to insert the hollow guidewire. If the catheter gets stuck at the bifurcation of the cerebral blood vessel and cannot move forward, the catheter is retracted a short section. Then, the hollow guidewire is delivered within the catheter, and the subsequent steps are performed using the method described above.

[0029] The beneficial effects of this utility model are:

[0030] By creating a bulge on the guidewire, the efficiency of the catheter navigating bends and bifurcations during operation is improved, reducing the risk of entrapment. This also facilitates the procedure and shortens the time required to establish access.

[0031] The guidewire is hollow, retaining the function of delivering the microguidewire and reducing the number of instrument exchanges.

[0032] The guidewire can be used alone or with an internal microguidewire for use as a dual guidewire system. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Figure 1This is a schematic diagram of a catheter and guidewire being transported in a blood vessel and encountering obstruction at a bifurcation point.

[0035] Figure 2 This is a conventional solution that involves inserting multiple intermediate catheters between the catheter and the guidewire to make the guidewire and catheter more coaxial, thus avoiding the "windowsill effect."

[0036] Figure 3 This is a schematic diagram of the hollow guide wire guiding catheter of this utility model crossing a bifurcated blood vessel;

[0037] Figure 4 This is a schematic diagram of the hollow guidewire containing a microguidewire of this utility model crossing a bifurcated blood vessel;

[0038] Figure 5 This is a schematic diagram of the hollow guide wire of this utility model.

[0039] in,

[0040] 1. Catheter; 11. Microcatheter;

[0041] 21. Main blood vessels; 22. Branch blood vessels;

[0042] 3. Hollow guidewire; 31. Guidewire body;

[0043] 4. Bulging body;

[0044] 51. First developing mark; 52. Second developing mark;

[0045] 5. Microguidewire. Detailed Implementation

[0046] 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.

[0047] This application provides a hollow guidewire, 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.

[0048] To address the issues in existing technologies where handling the "windowsill effect" complicates surgery, prolongs operation time, is uneconomical, and increases technical challenges, an embodiment of this application provides a hollow guidewire. This is described in detail below.

[0049] like Figures 3 to 5 As shown, a hollow guidewire includes

[0050] Guide wire body 31, wherein a first imaging mark 51 is provided at the end of the guide wire body 31;

[0051] A bulge body 4 is disposed at the distal end of the guidewire body 31, and a second imaging mark 52 is disposed inside the bulge body 4;

[0052] The guide wire body 31 is inserted into the bulge body 4 and is coaxially arranged with the guide wire body 31.

[0053] The bulge 4 has the largest diameter in the middle and gradually decreases at both ends.

[0054] Specifically, as an optional implementation method in this embodiment, such as Figures 3 to 5 As shown, the guidewire body 31 has a through single-lumen channel inside.

[0055] In this embodiment, a single-lumen channel is used for the passage of the microguidewire 5, such as... Figure 4 As shown.

[0056] In this embodiment, the material of the developing marker wire can be platinum-iridium, platinum, tungsten, etc.

[0057] Specifically, as an optional implementation method in this embodiment, such as Figure 5 As shown, the diameter of the bulge 4 at its maximum point in the middle is 0.4-4 mm, and its length is 5-50 mm.

[0058] Specifically, as an optional implementation method in this embodiment, such as Figures 3 to 5 As shown, the outer diameter of the guidewire body 31 is 0.035–0.085 mm, and its inner diameter is 0.010–0.030 mm.

[0059] Specifically, as an optional implementation method in this embodiment, such as Figures 3 to 5 As shown, the bulge 4 is a double-conical structure with a larger middle and smaller ends, or an elliptical structure.

[0060] The bulge 4 is fixed to the guide wire body 31 by heating and melting.

[0061] The bulge 4 can also be fixed to the guide wire body 31 by either laser welding or adhesive bonding.

[0062] In this embodiment, the bulge 4 is made of a polymer material, such as Pebax, polyurethane, or eptfe.

[0063] In this embodiment, the guide wire body 31 is made of polymer material, metal wire winding or braiding reinforcement.

[0064] Specifically, as an optional implementation in this embodiment, the first developing mark 51 can be a developing ring or a developing wire.

[0065] The second developing mark can also be a developing ring or developing wire, or the developing agent can be added directly to the material of the bulge body 4. In this case, barium sulfate, bismuth oxide, tungsten powder, etc. can be added to the developing mark entity for development.

[0066] The hollow guidewire 3 of this invention is used to guide the catheter 1 through a tortuous, bifurcated blood vessel. (See also...) Figure 3 and Figure 4 The hollow guidewire 3 serves only as an auxiliary delivery device for catheter 1 and is not used as a catheter itself.

[0067] Currently, during vascular interventional surgery, a guidewire and a catheter are usually used in tandem to guide the catheter into the corresponding lesion location in the blood vessel.

[0068] like Figure 1 As shown, when encountering tortuous bifurcated blood vessels, they often get stuck, forming a window sill effect. At this time, it is necessary to rotate the main body or catheter 1 to change its direction and overcome the problem. This is usually quite difficult. Sometimes, if the rotation force is slightly too great, vasospasm or puncture of the inner wall of the blood vessel can occur, forming a dissection.

[0069] like Figure 2 As shown, sometimes multiple catheters are installed outside the guidewire to reduce the window sill effect. The cross-section of the suction catheter and the cross-section of the microcatheter 11 form an eccentric circle.

[0070] When performing vascular interventional surgery, the hollow guidewire 3 of this invention concentrates the gap between the catheter 1 and the guidewire on the bulge 4 of the guidewire. The bulge 4 guides the movement of the catheter 1, which improves the efficiency of the catheter 1 passing through the curved branch blood vessel 22, reduces the occurrence of clogging, facilitates operation, and shortens the time for establishing access during surgery.

[0071] The following provides three clinical applications of the aforementioned center-hole guidewire;

[0072] 1. A method of using the hollow guidewire described above, wherein during surgery, the operator first controls the hollow guidewire 3 to move a certain distance within the cerebral blood vessel, and monitors the position of the hollow guidewire 3 in real time through imaging markers to ensure that the axis of the hollow guidewire 3 coincides with the axis of the cerebral blood vessel until the bulge reaches the bifurcation of the cerebral blood vessel, and observes through a second imaging marker to prevent the hollow guidewire 3 from entering the bifurcation vessel.

[0073] The catheter 1 is guided along the path established by the hollow guide wire 3. When the catheter 1 is guided to the tortuous and narrow bifurcation of the distal cerebral blood vessel, the cross-section of the catheter 1 and the cross-section of the cerebral blood vessel are concentric rings. That is, the end wall of the catheter 1 will not be hooked by the bifurcation of the cerebral blood vessel, so that the catheter 1 can pass smoothly through the tortuous and narrow bifurcation of the cerebral blood vessel.

[0074] Continue pushing catheter 1 until it reaches the preset position, then withdraw hollow guidewire 3.

[0075] 2. A method for using the hollow guidewire described above is provided. During surgery, the operator first inserts the hollow guidewire 3 into the catheter 1, and the bulge of the hollow guidewire 3 is placed at the end of the catheter 1.

[0076] The catheter 1 containing the hollow guidewire 3 is then moved within the cerebral blood vessel. The position of the catheter 1 and the hollow guidewire 3 is monitored in real time using contrast markers to ensure that the axis of the catheter 1 and the hollow guidewire 3 coincides with the axis of the cerebral blood vessel until the bulge reaches the bifurcation of the cerebral blood vessel. The second contrast marker is used to observe and prevent the catheter 1 and the hollow guidewire 3 from entering the bifurcation vessel.

[0077] Continue to deliver catheter 1 and hollow guidewire 3. When catheter 1 is advanced to the tortuous and narrow bifurcation of the distal cerebral blood vessel, the cross-section of catheter 1 and the cross-section of the cerebral blood vessel are concentric rings. That is, the end wall of catheter 1 will not be hooked by the bifurcation of the cerebral blood vessel, so that catheter 1 can pass smoothly through the tortuous and narrow bifurcation of the cerebral blood vessel.

[0078] Continue pushing catheter 1 until it reaches the preset position, then withdraw hollow guidewire 3.

[0079] 3. A method for using the hollow guidewire described above is provided. During surgery, the operator first controls the catheter 1 to move a certain distance within the cerebral blood vessel. The position of the catheter 1 is monitored in real time by the imaging marker of the catheter 1. If the catheter 1 passes smoothly through the bifurcation vessel, there is no need to insert the hollow guidewire 3. If the catheter 1 is stuck at the bifurcation of the cerebral blood vessel and cannot move forward, the catheter 1 is retracted a small section, and then the hollow guidewire 3 is delivered within the catheter 1. Then, the subsequent steps are performed according to the method described in the first method above.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 hollow guidewire, characterized in that, include The guidewire body (31) has a first imaging mark (51) at its end. A bulge body (4) is disposed at the distal end of the guidewire body (31), and a second imaging mark (52) is disposed inside the bulge body (4). The guidewire body (31) is inserted into the bulge body (4) and is coaxially arranged with the guidewire body (31); The bulge (4) has the largest diameter in the middle and gradually decreases at both ends; The guidewire body (31) is provided with a through single-lumen channel; The bulge is fixed to the guide wire body 31 by laser welding or adhesive bonding.

2. The hollow guidewire according to claim 1, characterized in that, The diameter of the bulge (4) at its maximum point is 0.4-4 mm, and its length is 5-50 mm.

3. A hollow guidewire according to claim 1, characterized in that, The outer diameter of the guidewire body (31) is 0.035 to 0.085 mm, and its inner diameter is 0.010 to 0.030 mm.

4. A hollow guidewire according to claim 1, characterized in that, The bulge (4) is a double-conical structure with a large middle and small ends, or an elliptical structure.

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