Auxiliary guide wire for cleaning blocked bile duct metal stent
By designing a guidewire with a bent connection segment, the problem that existing guidewires are prone to wall penetration when cleaning the bile duct metal bracket is solved, and a safer and more effective cleaning process is achieved.
Patent Information
- Application Number
- CN202420663686.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-04-02
AI Technical Summary
In transendoscopic retrograde cholangiopancreatography, existing guidewires are prone to penetrate into the mesh space of the stent when cleaning the metal choke of the bile duct, resulting in wall penetration problems, which in turn leads to complications such as tissue damage and perforation.
An auxiliary guide wire is designed, which includes a guide wire body and a connecting section. At least part of the connecting section is bent to one side of the guide wire body and in parallel with the guide wire body, increasing the radial dimension of the distal end. The connecting section composed of arc segments and straight segments can avoid entering the mesh gap of the bracket and gradually tend to be straight during the pullback process.
By using this guidewire, wall penetration problems are avoided, damage to the bile duct wall and complications are reduced during the cleaning process, and the safety and effectiveness of cleaning are improved.
Smart Images
Figure CN222488544U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an auxiliary guide wire for clearing a metal stent that is blocking a bile duct. Background Art
[0002] During endoscopic retrograde cholangiopancreatography (ERCP), if the patient has malignant bile duct obstruction or pancreatic tumors that cannot be radically removed, a metal biliary stent needs to be placed in the patient's bile duct to relieve the patient's bile duct obstruction. Therefore, this stent needs to remain in the patient's body for a long time. During the retention of the bile duct stent, the growth of tumors in the stent or the backflow of intestinal contents may cause stent occlusion. In this case, accessories such as baskets and balloons are needed to clean the bile duct stent to achieve the purpose of unblocking. During cleaning, such accessories need to enter the blocked bile duct stent along the guide wire. However, the problem currently existing in clinical practice is that the front end of the guide wire currently used in clinical practice is straight or "J" shaped. The front end of the guide wire enters the stent and easily penetrates into the mesh space of the bile duct stent, causing the problem of "penetrating the wall", resulting in the introduction of subsequent accessories for bile duct stent cleaning and other operations to "go astray", that is, enter the space between the outer wall of the stent and the bile duct wall that should not be entered, thereby causing complications such as tissue damage and perforation.
[0003] In view of the above problems, the utility model provides an auxiliary guide wire for clearing a metal stent that is blocking a bile duct. Utility Model Content
[0004] In order to overcome the problems raised in the background technology, the utility model adopts the following technical solutions:
[0005] An auxiliary guide wire for clearing a metal stent that is blocked in a bile duct, comprising:
[0006] A guidewire body, the guidewire body having a proximal end and a distal end opposite to each other;
[0007] A connecting segment is connected to the distal end, wherein at least a portion of the connecting segment is bent toward one side of the guidewire body, and at least a portion of the connecting segment is parallel to the guidewire body, so that the radial size of the distal end is increased.
[0008] In some embodiments of the present application, the connecting segment includes: an arc segment and a straight segment, wherein the arc segment connects the distal end with the straight segment, and the straight segment is in a parallel relationship with the guidewire body.
[0009] Furthermore, the guidewire body is integrally connected to the arc segment, wherein the diameter of the guidewire body is the same as the diameter of the cross section of the arc segment.
[0010] Furthermore, the outer wall of the straight line segment and the outer wall of the arc segment are in a tangent relationship.
[0011] Furthermore, the arc segment is in the shape of a 1 / 2 circle, and the maximum diameter does not exceed 1 cm.
[0012] Furthermore, the arc segment is elastic, and when subjected to a pulling force greater than a preset value, the arc segment gradually tends to a straight state.
[0013] In some embodiments of the present application, the guide wire body is made of one of stainless steel and nickel-titanium alloy, wherein the connecting section and the guide wire body are made of the same material.
[0014] In some embodiments of the present application, it also includes:
[0015] The sheath is sleeved on the outer walls of the guide wire body and the connecting section, and completely covers the guide wire body and the connecting section.
[0016] In some embodiments of the present application, it also includes:
[0017] A hydrophilic coating is applied to the outer wall of the guide wire body and the connecting section, and completely covers the outer wall of the guide wire body and the connecting section.
[0018] Furthermore, the hydrophilic coating is a PVP hydrophilic coating.
[0019] Beneficial effects of the utility model:
[0020] 1. By providing a connecting segment including an arc segment and a straight segment at the distal end of the guide wire body, the arc segment can avoid penetrating into the mesh gap of the bile duct stent during use, thereby avoiding the occurrence of the "wall penetration" problem;
[0021] 2. Through the arc segment, when introducing accessories to clean the blocked bile duct stent, avoid the accessories being introduced into the gap between the outer wall of the stent and the bile duct wall, thereby avoiding complications such as damage to the patient's bile duct tissue and perforation during cleaning.
[0022] 3. By setting an elastic arc segment, when the guide wire body is pulled back during use, the arc segment can gradually become straight with the support of the stent wall or the bile duct wall, thereby avoiding scratches on the patient's bile duct wall or getting stuck in the mesh gap of the bile duct stent. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the structure of the guide wire body of the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the guide wire body of the utility model;
[0025] Figure 3 It is a schematic diagram of the arc segment and straight line segment structure of the utility model;
[0026] Figure 4 This is a schematic diagram of the structure of the utility model after the arc segment is deformed;
[0027] Figure 5 This is a schematic diagram of the flexible core and wire winding structure of the utility model;
[0028] Figure 6 This is a schematic diagram of the structure of the flexible core of the utility model after deformation;
[0029] Figure 7 This is a schematic diagram of the structure of the "U"-shaped spring of the utility model;
[0030] Figure 8 This is a schematic diagram of the structure of the utility model after the basket is connected to the guide wire body;
[0031] In the figure, 1, guide wire body; 11, distal end; 12, proximal end; 13, connecting segment; 131, arc segment; 1311, flexible core; 1312, winding wire; 132, straight segment; 14, "U"-shaped spring; 2, basket. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the utility model are clearly and completely described below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Those skilled in the art can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] Example 1
[0034] Figure 1 and Figure 8 , showing the main technical content of this embodiment, this specific embodiment provides an auxiliary guide wire for clearing a metal stent that is blocked in a bile duct, which includes:
[0035] A guide wire body 1, wherein the guide wire body 1 has a proximal end 12 and a distal end 11 opposite to each other;
[0036] The connecting section 13 is connected to the distal end 11, wherein at least a portion of the connecting section 13 is bent toward one side of the guide wire body 1, and at least a portion of the connecting section 13 is parallel to the guide wire body 1, so that the radial dimension of the distal end 11 is increased. When in use, the distal end 11 is placed into the blocked bile duct stent through the operator's operation; at this time, the distal end 11 equipped with the connecting section 13 will not enter the mesh gap of the bile duct stent during the operator's operation due to the increase in radial dimension, thereby avoiding the occurrence of wall penetration problems; then, accessories such as the basket 2 or the balloon are transported into the patient's body from the proximal end 12 of the guide wire body 1 as the starting point; until it reaches the blocked bile duct stent; the operator repeatedly pushes and pulls the accessories to achieve the cleaning of the blocked bile duct stent.
[0037] refer to Figure 1 —3. In the present embodiment, the connecting segment 13 includes: an arc segment 131 and a straight segment 132, wherein the arc segment 131 connects the distal end 11 with the straight segment 132, and the straight segment 132 is parallel to the guidewire body 1. Under this setting, the distal end 11 of the guidewire body 1 is in a "U" shape, thereby increasing the radial dimension of the distal end 11, so as to avoid entering the mesh gap of the bile duct stent when in use.
[0038] More specifically, the guidewire body 1 is integrally connected to the arc segment 131, wherein the diameter of the guidewire body 1 is the same as the diameter of the cross-section of the arc segment 131, and more specifically, the outer wall of the straight segment 132 is tangent to the outer wall of the arc segment 131. Under this setting, there is no edge between the connection between the guidewire body 1, the arc segment 131 and the straight segment 132, so that in the process of pushing the guidewire body 1, the guidewire can be prevented from scratching the inner wall of the patient's bile duct, and it is easier to push the guidewire body 1 into the patient's body.
[0039] refer to Figure 3 In this embodiment, the arc segment 131 is in the shape of a 1 / 2 circle, and its maximum diameter does not exceed 1 cm. It should be noted that the diameter of a conventional endoscopic biopsy channel is within 3-4 mm, so preferably, the diameter of the arc segment 131 is less than 4 mm, so that it can be pushed into the patient's body along the biopsy channel during use.
[0040] refer to Figure 3 -4. In the present embodiment, the arc segment 131 is elastic, and when subjected to a pulling force greater than a preset value, the arc segment 131 gradually tends to a straight state. Specifically, when the guide wire body 1 is pulled back in the patient's body, the straight end can be supported by the patient's bile duct wall or the bile duct stent wall, so that the arc end receives a pulling force greater than the preset value. At this time, the arc segment 131 gradually tends to a straight state, and thus during the pulling back process, the straight segment 132 can be prevented from scratching the patient's bile duct wall or getting stuck in the mesh gaps between the bile ducts.
[0041] refer to Figure 3 —4. More specifically, the guidewire body 1 is made of one of stainless steel and nickel-titanium alloy, wherein the connecting segment 13 and the guidewire body 1 are made of the same material. With the guidewire body 1 and the connecting segment 13 made of such material, when the arc segment 131 is deformed, the arc segment 131 can be restored to its original shape due to the characteristics of the material used, and then when the guidewire body 1 is pushed back again, the connecting segment 13 can still be prevented from piercing into the mesh gap of the bile duct stent.
[0042] In this embodiment (not shown), a sheath is provided, which is sleeved on the outer walls of the guidewire body 1 and the connecting section 13, and completely covers the guidewire body 1 and the connecting section 13; this setting improves the smoothness of the outer walls of the guidewire body 1 and the connecting section 13, thereby improving the passability of the guidewire body 1 in the patient's body.
[0043] Alternatively, a hydrophilic coating is provided, applied to the outer walls of the guidewire body 1 and the connecting section 13, and completely covers the outer walls of the guidewire body 1 and the connecting section 13; more specifically, the hydrophilic coating is a PVP hydrophilic coating, for example: a hydrophilic coating compounded with a polymer PVP (polyvinyl pyrrolidone), or a PVP hydrophilic coating prepared by free radical polymerization of vinyl pyrrolidone monomer. When in use, the outer walls of the guidewire body 1 and the connecting section 13 are in contact with the patient's body secretions, thereby improving the overall smoothness of the guidewire body 1, thereby reducing the friction between the guidewire body 1 and the human tissue, thereby improving the passability of the guidewire body 1.
[0044] In this embodiment, the outer wall of the guide wire body 1 and the outer wall of the connecting section 13 are covered with a plastic sheath, and a hydrophilic coating is coated on the outer wall of the plastic sheath; under this setting, the friction coefficient between the guide wire body 1 and the human tissue is reduced to a minimum. At the same time, when the basket 2, balloon and other accessories are transported along the guide wire body 1, the pushing process can also be made smoother.
[0045] Example 2
[0046] Different from Example 1, Figure 1 and Figure 5In this embodiment, the arc segment 131 is composed of a flexible core 1311 and a winding wire 1312. The flexible core 1311 is in a 1 / 2 circle shape, wherein one end of the flexible core 1311 is connected to the distal end 11, and the other end of the flexible core 1311 is connected to the straight segment 132; the winding wire 1312 is arranged around the outer wall of the flexible core 1311 and completely covers the flexible core 1311, wherein the winding wire 1312 can maintain the shape of the flexible core 1311 when the flexible core 1311 is not subjected to force. When in use, the flexible core 1311 and the straight segment 132 are pushed into the blocked bile duct stent. The 1 / 2 circular flexible core 1311 prevents the guide wire body 1 from entering the blocked bile duct stent. Furthermore, when the guide wire body 1 is pulled back, the flexible core 1311 can be supported by the patient's bile duct wall or the bile duct stent wall and gradually tend to a straight state, thereby preventing the straight segment 132 from scratching the patient's bile duct wall or getting stuck in the mesh gap between the bile ducts during the pulling back process.
[0047] refer to Figure 1 and Figure 5 —6. More specifically, the radius of the 1 / 2 circle formed by the flexible core 1311 is less than 5 mm. Preferably, the radius of the 1 / 2 circle is 1.5 mm. Through this arrangement, when in use, the flexible core 1311 can be pushed along the biopsy channel of the endoscope; at the same time, the diameter of the distal end 11 of the guide wire body 1 is increased, and during use, it can avoid entering the mesh gap of the bile duct stent to a certain extent.
[0048] More specifically, the flexible core 1311 and the distal end 11 are connected by welding or an integral connection, and the connection method between the flexible core 1311 and the straight segment 132 is the same as the connection method between the flexible core 1311 and the distal end 11. Preferably, the flexible core 1311 and the distal end 11 are connected in an integral manner, which can reduce the possibility of breakage between the flexible core 1311 and the distal end 11 during use.
[0049] In this embodiment, the winding wire 1312 is made of nickel-titanium alloy. After the flexible core 1311 is deformed, the characteristics of the material used for the winding wire 1312 can restore the flexible core 1311 to its original shape; more specifically, the winding wire 1312 is spirally shaped on the outer wall of the flexible core 1311; wherein the two ends of the winding wire 1312 are respectively welded to the distal end 11 and the straight segment 132.
[0050] In this embodiment, the outer wall of the straight segment 132 is tangent to the outer wall of the arc segment 131, and the straight segment 132 and the guide wire body 1 are parallel, so that the distal end 11 of the guide wire body 1 is in a "U" shape, thereby preventing the distal end 11 of the guide wire body 1 from drilling into the mesh gap of the bile duct stent during the process of inserting the guide wire body 1.
[0051] Example 3
[0052] refer to Figure 1 and Figure 7 In the present embodiment, the connecting section 13 is constructed as a "U"-shaped spring 14, wherein the "U"-shaped spring 14 is made of nickel-titanium alloy. More specifically, the "U"-shaped spring has a first end and a second end, the first end is connected to the distal end 11, and the second end is configured as a ball head. When the pull-back operation is performed, the "U"-shaped spring 14 is deformed and deformed to a straight state, thereby avoiding scratching the patient's bile duct wall or getting stuck in the mesh gap of the bile duct stent.
[0053] The use of the utility model:
[0054] 1. Place the guidewire into the operating channel of the endoscope, and the operator pushes the guidewire so that the distal end of the guidewire enters the metal stent that is blocked in the patient's bile duct;
[0055] 2. Starting from the proximal end of the guidewire body, push the basket, balloon and other accessories into the patient's body along the guidewire body. After the pushing is completed, the basket or balloon is expanded between the bile ducts;
[0056] 3. Repeatedly push and pull the basket or balloon along the guide wire body to clear the blocked bile duct stent. At the same time, the connecting section at the distal end of the guide wire body can prevent the guide wire body from entering the gap of the bile duct stent.
[0057] 4. At the same time, when the pull-back operation is performed again, the straight segment can use the patient's bile duct wall or the stent wall to make the arc segment deform to a straight state, thereby avoiding scratches on the patient's bile duct wall or getting stuck in the mesh gap of the bile duct stent.
[0058] The above-mentioned embodiments are only used to understand the present invention. It should be noted that, for those skilled in the art, several improvements can be made to the present invention without departing from the principle of the present invention, and these improvements will also fall within the scope of protection of the claims of the present invention.
Claims
1. An auxiliary guide wire for clearing a metal stent that is blocked in a bile duct, characterized in that: It includes: A guidewire body, the guidewire body having a proximal end and a distal end opposite to each other; A connecting segment is connected to the distal end, wherein at least a portion of the connecting segment is bent toward one side of the guidewire body, and at least a portion of the connecting segment is parallel to the guidewire body, so that the radial size of the distal end is increased.
2. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 1, characterized in that: The connecting segment includes: an arc segment and a straight segment, wherein the arc segment connects the distal end with the straight segment, and the straight segment is in a parallel relationship with the guide wire body.
3. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 2, characterized in that: The guidewire body is integrally connected to the arc segment, wherein the diameter of the guidewire body is the same as the diameter of the cross section of the arc segment.
4. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 3, characterized in that: The outer wall of the straight line segment and the outer wall of the arc segment are in a tangent relationship.
5. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 2, characterized in that: The arc segment is in the shape of a 1 / 2 circle, and the maximum diameter does not exceed 1 cm.
6. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to any one of claims 2 to 5, characterized in that: The arc segment is elastic, and when subjected to a pulling force greater than a preset value, the arc segment gradually tends to a straight state.
7. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 1, characterized in that: The guide wire body is made of one of stainless steel and nickel-titanium alloy, wherein the connecting section and the guide wire body are made of the same material.
8. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 1, characterized in that: Also includes: The sheath is sleeved on the outer walls of the guide wire body and the connecting section, and completely covers the guide wire body and the connecting section.
9. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 1, characterized in that: Also includes: A hydrophilic coating is applied to the outer wall of the guide wire body and the connecting section, and completely covers the outer wall of the guide wire body and the connecting section.
10. The auxiliary guide wire for clearing a metal stent for blocking a bile duct according to claim 9, characterized in that: The hydrophilic coating is a PVP hydrophilic coating.