Controlled bending guide wire

Abstract

The utility model belongs to the technical field of guide wires, and particularly relates to a controlled bending guide wire which comprises a mandrel, a core wire, a sheath, an end, a developing electrode and a wire. The developing electrode is arranged in the sheath and located on the peripheral side of the core wire, and the wire is connected with the developing electrode and an external power supply, so that the developing electrode develops and emits heat when being electrified, and the sheath is heated and bent; wherein the core wire comprises a near-end bending section, a middle bending section and a far-end bending section which are sequentially connected, and the diameters of the near-end bending section, the middle bending section and the far-end bending section are sequentially reduced. The diameter of the near-end bending section, the diameter of the middle bending section and the diameter of the far-end bending section are sequentially reduced, the resistance of the core wire to the bending of the sheath is reduced, the guide wire can be bent more easily, the farther the guide wire is, the bending amplitude is larger, the controllability is better, and the guide wire can better pass through a complex blood vessel; meanwhile, the developing electrodes are used for developing and positioning when being electrified, so that the operation accuracy is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of guidewires, and in particular to a controlled bending guidewire. Background Art

[0002] Interventional therapy is a minimally invasive treatment using modern high-tech means. Under the guidance of medical imaging equipment, special catheters, medical guidewires and other precision instruments are introduced into the human body to diagnose and locally treat pathological conditions in the body. Before the medical guidewire enters the human body, it is usually necessary to bend the head of the medical guidewire to make it have a suitable angle. Because the channels and blood vessels in the human body are intricate and have many branches, the bending angle of the medical guidewire needs to be frequently adjusted during the operation to meet the various channels and blood vessel branches. The operation is complicated and the efficiency of interventional therapy is low.

[0003] A Chinese patent with authorization announcement number CN114470487B discloses a medical guidewire and an interventional medical device. The medical guidewire includes a sheath, an end, a core wire, a core shaft and a plurality of electrode sheets. The core wire is inserted into the sheath, the end is installed at the distal end of the sheath and connected to the distal end of the core wire; the core shaft is installed at the proximal end of the sheath and connected to the proximal end of the core wire; each electrode sheet is arranged in the sheath and distributed along the length direction of the sheath; the electrode sheets locally heat the sheath after power is turned on, so that the heated sheath bends.

[0004] The prior art heats the sheath by energizing the electrode sheet, causing the guide wire to bend. Although this can solve the problem that the conventional guide wire needs to frequently adjust the guide wire angle, its control accuracy is poor. Therefore, it is necessary to improve the prior art to solve the above problem. Utility Model Content

[0005] The purpose of the present application is to provide a controlled bending guide wire, aiming to solve the technical problem of poor guide wire control accuracy in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides a controlled bending guide wire, comprising a mandrel, a core wire, a sheath, an end, a developing electrode and a conductive wire; the proximal end of the core wire is connected to the distal end of the mandrel, the sheath is sleeved on the outer peripheral side of the core wire, the end is installed on the distal end of the sheath, the developing electrode is arranged in the sheath and located on the peripheral side of the core wire, and the conductive wire connects the developing electrode and an external power source, so that the developing electrode develops and generates heat when energized, thereby causing the sheath to be bent by heat;

[0007] Among them, the core wire includes a proximal bending section, an intermediate bending section and a distal bending section which are connected in sequence, and the diameters of the proximal bending section, the intermediate bending section and the distal bending section decrease in sequence; the developing electrode includes a first electrode sheet, a second electrode sheet and a third electrode sheet connected to the wire, the first electrode sheet is installed at the distal end of the proximal bending section, the second electrode sheet is installed at the distal end of the intermediate bending section, and the third electrode sheet is installed at the distal end of the distal bending section.

[0008] As a preferred solution, the core wire is made of shape memory alloy, and the inner wall of the developing electrode is in contact with the core wire, so that when the developing electrode is energized, both the core wire and the sheath are bent by heat.

[0009] As a preferred solution, the material of the core wire is nickel-titanium alloy, stainless steel, cobalt-based alloy, manganese-iron alloy, zinc-copper alloy or nickel-iron alloy.

[0010] As a preferred solution, the bending angle of the core wire is 0-65°.

[0011] As a preferred solution, the terminal and the sheath are coated with an electrical insulation coating.

[0012] As a preferred solution, the material of the core wire is nickel-titanium alloy, stainless steel, cobalt-based alloy, manganese-iron alloy, zinc-copper alloy or nickel-iron alloy.

[0013] As a preferred solution, the material of the sheath is shape memory alloy.

[0014] As a preferred solution, the material of the developing electrode is silver.

[0015] As a preferred solution, the outer diameter of the sheath is 0.4-0.9 mm, and the outer diameter of the core wire is 0.2-0.7 mm.

[0016] Compared with the prior art, the above one or more technical solutions in a controlled bending guidewire provided by the present application have at least one of the following technical effects:

[0017] By setting the diameters of the proximal bending section, the middle bending section and the distal bending section to decrease in sequence, the resistance of the core wire to the bending of the sheath is reduced, making the guide wire easier to bend, and the bending amplitude is larger at the distal end, so the controllability is better and it can better pass through complex blood vessels; at the same time, the development positioning is performed when the development electrode is energized, further improving the accuracy of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of a controlled bending guide wire in this application.

[0020] Figure 2 This is a schematic diagram of the structure of a controlled bending guide wire in the energized bending state in the present application.

[0021] Figure 3 This is a schematic diagram of the guide wire (hidden sheath) in this application when it is not bent by heat.

[0022] Figure 4 This is a schematic diagram of the guide wire (hidden sheath) in the first case of the energized bending state in this application.

[0023] Figure 5 This is a schematic diagram of the guide wire (hidden sheath) in the second case of the energized bending state in this application.

[0024] Figure 6 This is a schematic diagram of the guide wire (hidden sheath) in the third case of the present application being energized and bent.

[0025] Figure 7 This is a schematic diagram of the guide wire (hidden sheath) in the fourth case of the energized bending state in this application.

[0026] Figure 8 This is a schematic diagram of the guide wire (hidden sheath) in the fifth case of the energized bending state in this application.

[0027] Fig. 9 This is a schematic diagram of the guide wire (hidden sheath) in the sixth case of the energized bending state in this application.

[0028] Fig.10 This is a schematic diagram of the guide wire (hidden sheath) in the seventh case of the energized bending state in this application.

[0029] Explanation of the reference numerals: 1-core shaft; 2-core wire; 3-sheath; 4-end; 5-developing electrode; 6-conducting wire; 7-proximal bending section; 8-middle bending section; 9-distal bending section; 10-first electrode sheet; 11-second electrode sheet; 12-third electrode sheet; 13-transition section. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In one embodiment of the present application, Figure 1-Figure 2 As shown, a controlled bending guide wire is provided, comprising a core shaft 1, a core wire 2, a sheath 3, a tip 4, a developing electrode 5 and a guide wire 6. It should be noted that the "proximal end" mentioned in the above description and the following description generally refers to the end of the medical device close to the operator during normal operation, and the "distal end" generally refers to the end of the medical device that first enters the patient's body during normal operation.

[0035] The proximal end of the core wire 2 is connected to the distal end of the core shaft 1. The sheath 3 is sleeved on the outer peripheral side of the core wire 2. The terminal 4 is installed at the distal end of the sheath 3. The developing electrode 5 is arranged in the sheath 3 and is located on the peripheral side of the core wire 2. The wire 6 connects the developing electrode 5 and an external power source, so that the developing electrode 5 develops and generates heat when it is energized, thereby causing the sheath 3 to bend due to the heat.

[0036] The core wire 2 includes a proximal bending section 7, an intermediate bending section 8 and a distal bending section 9 connected in sequence. The diameters of the proximal bending section 7, the intermediate bending section 8 and the distal bending section 9 decrease in sequence. The core wire 2 is usually made of a metal material. By gradually reducing the diameter of the core wire 2 from the proximal end to the distal end, the guide wire can be more easily bent, and the bending amplitude at the distal end is larger, so that it can better pass through blood vessels with complex shapes, and the operation accuracy is higher.

[0037] Further, the core wire 2 also includes a transition section 13, which is arranged between the proximal bending section 7 and the middle bending section 8, and the transition section 13 is also arranged between the middle bending section 8 and the distal bending section 9. The cross-sectional shapes of the proximal bending section 7, the middle bending section 8 and the distal bending section 9 are circular, and the diameter of the transition section 13 is equal to the diameter of the bending sections connected at both ends. By setting the transition section 13, stable force transmission can be achieved, good support and pushing effects can be maintained, and the stability of the guide wire during use is guaranteed.

[0038] Furthermore, the core wire 2 is made of nickel-titanium alloy, stainless steel, cobalt-based alloy, manganese-iron alloy, zinc-copper alloy or nickel-iron alloy.

[0039] The sheath 3 is spring-shaped, which improves the support, maneuverability and tracking of the guidewire, and enhances the visibility and tactile feedback of the guidewire, helping the operator to better locate the guidewire entering the human body and perceive the activity of the guidewire.

[0040] Furthermore, the sheath 3 is made of a shape memory alloy, and the sheath 3 bends after being heated by the developing electrode 5, changing from a straight shape in a normal state to a curved shape in a memory shape. By setting it as a shape memory alloy, the sheath 3 returns to its original shape after cooling, and the guide wire is pulled out during the process of the sheath 3 returning from a curved shape to a straight shape, which can avoid the problem of the end 4 hooking the catheter port or even damaging the catheter wall, and ensure that the guide wire can be safely removed from the human body.

[0041] In this embodiment, by setting the diameters of the proximal bending section 7, the middle bending section 8 and the distal bending section 9 to decrease successively, when the developing electrode 5 heats the sheath 3, the bending angle of the sheath 3 can reach 0-65° with better accuracy.

[0042] The end 4 is hemispherical, which reduces collision damage to blood vessels. The distal end of the distal bending section 9 is connected to the proximal end of the end 2, which improves the penetration and passability of the guide wire when encountering resistance, and improves the tactile feedback of the guide wire, helping the operator to better perceive the activity of the guide wire and improve the accuracy of operation.

[0043] Furthermore, the surfaces of the end 4 and the sheath 3 are coated with an electrical insulating coating, preferably a PTFE coating (polytetrafluoroethylene) to prevent the current when the developing electrode 5 is energized from causing damage to the human body and improve the safety of interventional treatment. At the same time, the PTFE coating has the advantages of low water absorption, surface non-stickiness, corrosion resistance, high temperature resistance, excellent electrical insulation, high strength, light weight, good flexibility, and long life. It can reduce surface friction, improve the tracking and passability of the guide wire, and thus improve the efficiency of interventional treatment.

[0044] The developing electrode 5 includes a first electrode sheet 10, a second electrode sheet 11 and a third electrode sheet 12 which are connected to the wire 6 in sequence, the first electrode sheet 10 is installed at the distal end of the proximal bending section 7, the second electrode sheet 11 is installed at the distal end of the middle bending section 8, and the third electrode sheet 12 is installed at the distal end of the distal bending section 9.

[0045] Furthermore, the developing electrode 5 is made of silver, which has good electrical conductivity, thermal conductivity and developing effect. In the operation of hospital instrument imaging, the developing electrode 5 displays a black shadow under X-rays, providing the operator with accurate position information of the guide wire, including the depth of the guide wire entering the human body's blood vessels. The developing electrode 5 is annular, and the sheath 3 is heated more evenly by being set in an annular shape.

[0046] There are three wires 6 , and each wire 6 is respectively connected to the first electrode sheet 10 , the second electrode sheet 11 , and the third electrode sheet 12 , so as to independently control the temperature of each developing electrode 5 , thereby further improving the operation accuracy.

[0047] In the embodiment of the present application, the outer diameter of the sheath 3 is 0.4-0.9 mm, and the outer diameter of the core wire 2 is 0.2-0.7 mm, which can meet the sheath diameter required for most interventional surgeries.

[0048] In the present application, the temperature of the sheath 3 is controlled by the developing electrode 5, thereby controlling the bending shape of the guide wire, and the guide wire is transformed into a straight shape and a curved shape according to the structure of the channel and the blood vessel, so as to assist the balloon catheter to conveniently reach the lesion in the human body, thereby greatly improving the efficiency of interventional treatment. After the treatment is completed, when the guide wire is pulled out of the human body, the developing electrode 5 is stopped from being energized, and the developing electrode 5 is no longer heated. The sheath 3 dissipates heat in the flowing blood, and the guide wire is pulled out of the human body during the process of returning to a straight shape. This can avoid the problem of the end 2 hooking the catheter port or even damaging the catheter wall, thereby ensuring that the guide wire can be safely separated from the human body, thereby greatly improving the safety of interventional treatment.

[0049] In another embodiment of the present application, the core wire 2 is made of shape memory alloy, and the inner wall of the developing electrode 5 is in contact with the core wire 2, so that when the developing electrode 5 is energized, the core wire 2 and the sheath 3 are both bent by heat to better bend the guide wire.

[0050] like Figure 3 As shown, when the developing electrodes 5 on the proximal bending section 7, the middle bending section 8 and the distal bending section 9 are not energized, the guide wire is straight because the guide wire has a small diameter and is bent by the path of the blood vessel wall.

[0051] When the developing electrode 5 on the distal bending section 9 is energized, the distal bending section 9 will be bent by heat, that is, the guide wire is bent by X°. Figure 4 Similarly, when only the developing electrode 5 on the middle bending section 8 or the proximal bending section 7 is energized, that is, the guide wire is bent by Y° or Z°, the bending position is different, as shown in FIG. Figure 5 and Figure 6 The angles Y°, Z° or X° are preset angles and can be the same or different.

[0052] When the developing electrodes 5 on the distal bending section 9 and the intermediate bending section 8 are energized, the distal bending section 9 and the intermediate bending section 8 are both bent by heat, that is, the guide wire is bent by (X+Y)°. Figure 7 shown.

[0053] When the developing electrodes 5 on the middle bending section 8 and the proximal bending section 7 are energized, the middle bending section 8 and the proximal bending section 7 are both bent by heat, that is, the guide wire is bent by (Y+Z)°. Figure 8 shown.

[0054] When the developing electrodes 5 on the distal bending section 9 and the proximal bending section 7 are energized, the distal bending section 9 and the proximal bending section 7 are bent, that is, the guide wire is bent (X+Z)°, as shown in FIG. Fig. 9 shown.

[0055] When the developing electrodes 5 on the distal bending section 9, the middle bending section 8 and the proximal bending section 7 are all energized, the distal bending section 9, the middle bending section 8 and the proximal bending section 7 are all bent by heat, that is, the guide wire is bent by (Y+X+Z)°. Fig.10 shown.

[0056] The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and these modifications or substitutions should be included in the protection scope of the present application.

Claims

1. A controlled bending guide wire, characterized in that: The invention comprises a core shaft, a core wire, a sheath, an end head, a developing electrode and a conducting wire; the proximal end of the core wire is connected to the distal end of the core shaft, the sheath is sleeved on the outer peripheral side of the core wire, the end head is installed on the distal end of the sheath, the developing electrode is arranged in the sheath and is located on the peripheral side of the core wire, and the conducting wire connects the developing electrode and an external power source, so that the developing electrode develops and generates heat when energized, thereby causing the sheath to bend due to the heat; Among them, the core wire includes a proximal bending section, an intermediate bending section and a distal bending section which are connected in sequence, and the diameters of the proximal bending section, the intermediate bending section and the distal bending section decrease in sequence; the developing electrode includes a first electrode sheet, a second electrode sheet and a third electrode sheet connected to the wire, the first electrode sheet is installed at the distal end of the proximal bending section, the second electrode sheet is installed at the distal end of the intermediate bending section, and the third electrode sheet is installed at the distal end of the distal bending section.

2. A controlled bending guidewire according to claim 1, characterized in that: There are three wires, and each of the wires is respectively connected to the first electrode sheet, the second electrode sheet, and the third electrode sheet.

3. A controlled bending guidewire according to claim 2, characterized in that: The core wire is made of shape memory alloy, and the inner wall of the developing electrode is in contact with the core wire, so that when the developing electrode is energized, both the core wire and the sheath are bent by heat.

4. A controlled bending guidewire according to claim 1 or 2, characterized in that: The core wire is made of nickel-titanium alloy, stainless steel, cobalt-based alloy, manganese-iron alloy, zinc-copper alloy or nickel-iron alloy.

5. A controlled bending guidewire according to any one of claims 1 to 3, characterized in that: The bending angle of the core wire is 0-65°.

6. A controlled bending guidewire according to any one of claims 1 to 3, characterized in that: The terminal head and the sheath are coated with an electrical insulating coating.

7. A controlled bending guidewire according to any one of claims 1 to 3, characterized in that: The material of the sheath is shape memory alloy.

8. A controlled bending guidewire according to any one of claims 1 to 3, characterized in that: The material of the developing electrode is silver.

9. A controlled bending guidewire according to any one of claims 1 to 3, characterized in that: The outer diameter of the sheath is 0.4-0.9 mm, and the outer diameter of the core wire is 0.2-0.7 mm.

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