Multi-segment ercp guidewire

Abstract

This utility model provides a multi-segment ERCP guidewire, including a core wire comprising a first core wire, a second core wire, and a third core wire. The two ends of the second core wire are respectively connected to one end of the first core wire and one end of the third core wire. The first core wire is made of stainless steel, the second core wire is made of nickel-titanium alloy, and the third core wire is made of polyurethane. The outer surface of the first core wire has a first coating layer, the outer surface of the second core wire has a second coating layer, and the outer surfaces of the second coating layer and the third core wire have a coating layer. The multi-segment design of this utility model ensures the proximal segment's pushability during doctor operation and the flexibility and torsional resistance of the distal segment in contact with the patient. The variable diameter coating design maintains the lubrication performance of the distal segment, and the silicone oil-based lubricating layer does not require pre-wetting in water before use. Therefore, the overall controllability, passability, and safety of the guidewire are improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a multi-segment ERCP guidewire. Background Technology

[0002] Interventional pancreatobiliary duct surgery (ERCP) is a minimally invasive technique guided by endoscopy or imaging. It is primarily used to diagnose and treat diseases of the pancreatic duct and bile duct system, with the core goal of avoiding traditional open surgery, reducing trauma, and improving treatment outcomes. The ERCP guidewire is a key instrument in ERCP. Before using catheters, stents, and other instruments, the guidewire passes through the pancreatic duct, especially at narrow points. Once the guidewire reaches the lesion, it precisely guides subsequent instruments to their appropriate positions. Generally, ERCP guidewires use a nickel-titanium alloy or stainless steel wire as the core, with a hydrophilic coating on the outer layer, and a straight or J-shaped soft tip.

[0003] Before use, the guidewire needs to be pre-soaked in water for lubrication. During use, the distal end of the guidewire needs to pass through complex anatomical structures, while the proximal end is controlled by the surgeon as it enters the body. If the guidewire core is entirely made of nickel-titanium alloy, the proximal end will be difficult for the surgeon to advance due to excessive elasticity; if the guidewire core is entirely made of stainless steel, the distal end will prolong the operation time or even cause perforation when passing through complex cavities due to insufficient elasticity. Guidewires made of a single material have the above limitations, and the adaptability of common coatings and tip designs to complex anatomical structures needs to be improved.

[0004] Therefore, a multi-segment ERCP guidewire was designed to improve its maneuverability, passability, and safety. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-segment ERCP guidewire that improves the guidewire's maneuverability, passability, and safety.

[0006] According to one aspect of the present invention, a multi-segment ERCP guidewire is provided, comprising a core wire, wherein the inner core wire includes a first core wire, a second core wire, and a third core wire, wherein the two ends of the second core wire are respectively connected to one end of the first core wire and one end of the third core wire; the first core wire is made of stainless steel, the second core wire is made of nickel-titanium alloy, and the third core wire is made of polyurethane; the outer surface of the first core wire is provided with a first coating layer, the outer surface of the second core wire is provided with a second coating layer, and the outer surfaces of the second coating layer and the third core wire are provided with a coating layer.

[0007] Preferably, the diameter of the cross-section of the third core wire gradually decreases in the direction away from the second core wire.

[0008] Preferably, the third core wire has a ball end at the end away from the second core wire.

[0009] Preferably, the first and second coating layers are made of PTFE.

[0010] Preferably, the coating material is silicone oil-based.

[0011] Preferably, the outer surface of the first covering layer is provided with a coating.

[0012] Preferably, the material of the third core wire also includes barium sulfate or tungsten powder.

[0013] Preferably, one end of the first core wire is welded to one end of the second core wire, and the other end of the second core wire is glued to one end of the third core wire.

[0014] This utility model provides a multi-segment ERCP guidewire. The multi-segment design ensures the proximal segment can be pushed by the doctor and the flexibility and torsional resistance of the distal segment that contacts the patient. The variable diameter coating design maintains the lubrication performance of the distal segment, and the silicone oil-based lubricating layer does not need to be pre-wetted in water before use. Therefore, the overall controllability, passability and safety of the guidewire are improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a multi-segment ERCP guidewire;

[0016] Figure 2 This is a schematic diagram of the third core wire;

[0017] Figure 3 This is a schematic diagram of the cross-section of the first core wire;

[0018] Figure 4 This is a schematic diagram of the cross-section of the first core wire. Detailed Implementation

[0019] To facilitate understanding of this application and to make the aforementioned objectives, features, and advantages of this application more apparent, a detailed description of specific embodiments of this application is provided below in conjunction with the accompanying drawings. Numerous specific details are set forth in the following description to provide a thorough understanding of this application, and preferred embodiments are shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application. This application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can also refer to the internal connection between two components.

[0023] For ease of description, in this instruction manual, the end of the guidewire furthest from the operator during use is defined as the distal end, or the front end, while the end held by the operator is defined as the proximal end, or the rear end.

[0024] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-4 As shown, a multi-segment ERCP guidewire includes a core wire comprising a first core wire 11, a second core wire 12, and a third core wire 13. The two ends of the second core wire 12 are connected to one end of the first core wire 11 and one end of the third core wire 13, respectively. The first core wire 11 is made of stainless steel, the second core wire 12 is made of nickel-titanium alloy, and the third core wire is made of polyurethane. The outer surface of the first core wire 11 is provided with a first coating layer 2, the outer surface of the second core wire 12 is provided with a second coating layer 3, and the outer surfaces of the second coating layer 3 and the third core wire 13 are provided with a coating 4. Specifically, the coating 4 is made of silicone oil and serves a lubricating function. The first core wire 11 and the second core wire 12 are both of equal diameter, while the third core wire 13 is of varying diameter, with its cross-sectional diameter gradually decreasing in the direction away from the second core wire 12. The third core wire 13 has a ball head 5 at the end away from the second core wire 12; the ball head 5 can also be an eccentric ball head or a hemispherical shape.

[0026] In one implementation, the first coating layer 2 and the second coating layer 3 are made of PTFE and have a two-tone zebra stripe pattern (such as alternating yellow and black or blue and white) to facilitate the operator's observation of the guidewire movement. The third core wire 13 is also made of barium sulfate or tungsten powder, which can be visualized under X-rays to facilitate the operator's observation of the guidewire position. One end of the first core wire 11 is welded to one end of the second core wire 12, and the other end of the second core wire 12 is glued to one end of the third core wire 13.

[0027] In one embodiment, the outer surface of the first covering layer 2 is provided with a coating 4, or the outer surface of the first covering layer 2 is coated with other hydrophilic coatings.

[0028] This multi-segment ERCP guidewire is used in ERCP surgery to guide catheters and other medical instruments to the target site in the body in conjunction with an endoscope. Specifically, after the guidewire enters the body through the endoscope's working channel, the operator can see the bicolor zebra stripe of the coating layer in the endoscopic image to understand the guidewire's movement. The coating 4 lubricates the guidewire's movement, and the third core wire 13 in the variable diameter section allows the guidewire tip to penetrate deeper into narrow areas. The spherical shape of the ball head 5 reduces the risk of tissue damage. The second core wire 12 is made of nickel-titanium alloy, which has good flexibility and torsional resistance, allowing it to better conform to the body's cavities. The first core wire 11 is made of stainless steel and has no coating, which prevents the operator from slipping, strengthens the pushing force, and improves operability. The third core wire 13 has a polyurethane soft tip incorporating barium sulfate, which can be visualized under X-ray, making it easy for the operator to observe the guidewire's position.

[0029] This utility model proposes a solution with a multi-segment design that ensures the proximal segment can be pushed by the doctor and the flexibility and torsional resistance of the distal segment that contacts the patient. The variable diameter coating design maintains the lubrication performance of the distal segment, and the silicone oil-based lubricating layer does not need to be pre-wetted in water before use; thus, the overall controllability, passability and safety of the guidewire are improved.

[0030] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A multi-segment ERCP guidewire, characterized in that, The device includes a core wire, which includes a first core wire (11), a second core wire (12), and a third core wire (13). The two ends of the second core wire (12) are respectively connected to one end of the first core wire (11) and one end of the third core wire (13). The first core wire (11) is made of stainless steel, the second core wire (12) is made of nickel-titanium alloy, and the third core wire is made of polyurethane. The outer surface of the first core wire (11) is provided with a first coating layer (2), the outer surface of the second core wire (12) is provided with a second coating layer (3), and the outer surfaces of the second coating layer (3) and the third core wire (13) are provided with a coating layer (4).

2. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The diameter of the cross-section of the third core wire (13) gradually decreases in the direction away from the second core wire (12).

3. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The third core wire (13) has a ball head (5) at the end away from the second core wire (12).

4. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The first coating layer (2) and the second coating layer (3) are made of PTFE.

5. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The coating (4) is made of silicone oil.

6. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The outer surface of the first covering layer (2) is provided with a coating (4).

7. The multi-segment ERCP guidewire as described in claim 1, characterized in that, The material of the third core wire (13) also includes barium sulfate or tungsten powder.

8. The multi-segment ERCP guidewire as described in claim 1, characterized in that, One end of the first core wire (11) is welded to one end of the second core wire (12), and the other end of the second core wire (12) is glued to one end of the third core wire (13).

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