Guide catheter replacement assist device and guide catheter replacement method

Abstract

The present application belongs to the technical field of interventional medical equipment and provides a guide catheter replacement auxiliary device and a method for replacing a guide catheter. The guide catheter replacement auxiliary device includes a balloon, a tube assembly, and a charging and discharging piece connected in sequence; the balloon is provided with an expandable accommodating cavity; the tube assembly is used to be placed in the guide catheter, and the tube assembly has a selectively closable lumen, the lumen communicating with the accommodating cavity; the charging and discharging piece is detachably connected to the tube assembly, and the charging and discharging piece is used to inject fluid into the accommodating cavity through the tube assembly to press the guide wire against the inner wall of the vessel, and to remove fluid from the accommodating cavity through the tube assembly to release the guide wire from the inner wall of the vessel. Using the guide catheter replacement auxiliary device provided by the present application, the operating physician can independently replace the guide catheter, which is simple to operate, takes less time, and can reduce the patient's pain.

Description

Technical Field

[0001] The present application relates to the technical field of interventional medical equipment, and in particular to a guide catheter replacement auxiliary device and a method for replacing a guide catheter. Background Art

[0002] In the interventional treatment of coronary heart disease and other diseases, a guide catheter and a guide wire are often used in conjunction with an expansion balloon or other interventional medical device. When in use, the guide catheter is generally first inserted into the blood vessel until the distal end of the guide catheter approaches the lesion site, and then a guide wire with a smaller outer diameter is loaded into the guide catheter until the distal end of the guide wire is closer to the lesion site. Subsequently, an expansion balloon or other interventional medical device can be loaded on the guide wire, and the lesion site is treated using the expansion balloon or other interventional medical device. For example, during percutaneous transluminal coronary angioplasty (PTCA), after the guide wire is loaded onto the guide catheter, sometimes the operating physician needs to replace the guide catheter due to the inappropriate size or distal shape of the guide catheter. However, when the old guide catheter is withdrawn, the guide wire will inevitably be withdrawn along with it. Then, after the new guide catheter is inserted, the guide wire needs to be reinserted into place, which is cumbersome, prolongs the operation time, and increases the patient's pain.

[0003] To prevent the guidewire from losing its original position when replacing the guide catheter, current practices include using a longer guidewire. The portion of the guidewire extending outside the patient's body must be at least slightly longer than the entire lumen of the guide catheter being used. This allows the operating physician or their assistant to maintain the guidewire's original position during the procedure. However, this method requires the cooperation of the operating physician and assistant, is cumbersome, and takes a long time. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a guide catheter replacement auxiliary device and a method for replacing a guide catheter, so as to solve the technical problems in the prior art that the operation of replacing a guide catheter requires the cooperation of multiple people, the operation is cumbersome and the operation time is long.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a guide catheter replacement auxiliary device for use with a guide catheter and a guidewire, the guide catheter replacement auxiliary device comprising a balloon, a tube assembly and a filling and unloading piece connected in sequence from the distal end to the proximal end; the balloon has an expandable accommodating cavity, the tube assembly is used to be placed in the guide catheter, and the tube assembly has a selectively closable lumen, the lumen is connected to the accommodating cavity, the filling and unloading piece is detachably connected to the tube assembly, the filling and unloading piece is used to inject fluid into the accommodating cavity through the tube assembly so that the guidewire is pressed against the inner wall of the blood vessel, and remove fluid from the accommodating cavity through the tube assembly to release the guidewire from the inner wall of the blood vessel.

[0006] In one embodiment, the tube assembly includes a connected tube member and a switch member, the tube member is connected to the balloon and has the lumen, the switch member is detachably connected to the filling and discharging member and is used to selectively close the proximal end of the lumen.

[0007] In one embodiment, the switch component includes a first connector, a flexible component and a second connector, the first connector is provided with a first through hole, the inner wall of the first through hole is provided with a step, the flexible component is provided in the first through hole, and the flexible component is provided with a second through hole that can be connected to the first through hole; the second connector can be movably installed in the first through hole, and the second connector can be moved to press the flexible component against the step to close the second through hole.

[0008] In one embodiment, the second connector is provided with a third through hole connected to the second through hole, one of the second connector and the first connector is connected to the pipe, and the other of the second connector and the first connector is detachably connected to the charging and discharging piece.

[0009] In one embodiment, the second connector is threadedly connected to the first connector or is detachably snap-fitted to the first connector.

[0010] In one embodiment, the switch component includes a valve body provided with an inner cavity and a valve core provided with a fourth through hole, one end of the valve body is connected to the pipe fitting and the other end is detachably connected to the filling and unloading component, the valve core is rotatably arranged in the valve body, and the fourth through hole is separated from or connected to the inner cavity as the valve core rotates.

[0011] In one embodiment, the tube is a hypotube having the lumen, and a metal wire extending axially along the hypotube is provided in the wall of the hypotube, and the metal wire extends to the distal end of the balloon.

[0012] In one embodiment, the balloon is provided with a channel separated from the accommodating cavity, and the channel is used to maintain the conduction of the blood vessels; wherein the channel is provided inside the balloon, or the channel is provided on the outer wall of the balloon.

[0013] In one embodiment, when the outer wall of the balloon is provided with the channel, the outer wall of the balloon is provided with a plurality of ridges, the channel is formed between two adjacent ridges, and the outer wall of the plurality of ridges is projected as a closed loop in the axial direction of the tube assembly; or, the outer wall of the balloon is provided with a groove, the internal space of the groove forms the channel, and the outer wall of the balloon is projected as a closed loop in the axial direction of the tube assembly.

[0014] In one embodiment, the outer wall of the balloon is provided with a plurality of ridges, the channel is formed between two adjacent ridges, and the outer wall of the plurality of ridges is projected as a closed loop in the axial direction of the tube assembly; or, the outer wall of the balloon is provided with a groove, the internal space of the groove forms the channel, and the outer wall of the balloon is projected as a closed loop in the axial direction of the tube assembly.

[0015] In one embodiment, the charging and discharging component includes a connecting component and an injection component, and the connecting component is used to seal the injection component and the switch component.

[0016] To achieve the above-mentioned object, the present application further provides a method for replacing a guide catheter, wherein the method for replacing a guide catheter adopts the above-mentioned guide catheter replacement auxiliary device, and the method for replacing a guide catheter comprises:

[0017] Loading a first guide catheter in the vessel, loading a guide wire in the first guide catheter, and making the distal end of the guide wire extend beyond the distal end of the first guide catheter;

[0018] loading the guide catheter replacement auxiliary device in the first guide catheter, and placing the balloon between the distal end of the first guide catheter and the distal end of the guide wire;

[0019] Using a filling and unloading member to inject fluid into the accommodating cavity of the balloon through the tube assembly, so that the volume of the accommodating cavity is increased and the guide wire is pressed against the inner wall of the blood vessel;

[0020] Disconnecting the charging and discharging member from the tube assembly, withdrawing the first guide catheter from the guidewire, and loading a second guide catheter onto the guidewire until the distal end of the second guide catheter approaches the proximal end of the balloon;

[0021] reconnecting the filling and discharging component to the tube assembly, and using the filling and discharging component to remove the fluid from the accommodating cavity through the tube assembly to release the guide wire from the inner wall of the vessel;

[0022] The guide catheter exchange assist device is withdrawn from the second guide catheter.

[0023] The beneficial effects of the guide catheter replacement auxiliary device and the guide catheter replacement method provided in the present application are: compared with the prior art, when the first guide catheter is inserted into the blood vessel and the guide wire is loaded on the first guide catheter, when the operating physician needs to replace the first guide catheter due to reasons such as the inappropriate shape of the end of the first guide catheter, the operating physician can load the guide catheter replacement auxiliary device provided in the present application into the first guide catheter and place the balloon between the distal end of the first guide catheter and the distal end of the guide wire. Then, the fluid is injected into the accommodating cavity of the balloon through the filling and unloading part to increase the volume of the balloon and thereby press the guide wire against the inner wall of the blood vessel. Then, the connection between the filling and unloading part and the tube assembly is released, the first guide catheter is withdrawn from the guide wire and loaded into the second guide catheter; then, the filling and unloading part is reconnected to the tube assembly, and the fluid in the accommodating cavity is removed through the tube assembly through the filling and unloading part to reduce the volume of the balloon and thereby release the guide wire from the inner wall of the blood vessel; finally, the guide catheter replacement auxiliary device is withdrawn from the second guide catheter. The above operation can be completed independently by the operating physician. It is simple, time-saving, and can alleviate the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A schematic diagram of the structure of the guide catheter replacement auxiliary device provided in an embodiment of the present application when used in conjunction with a guide catheter and a guide wire;

[0026] Figure 2 for Figure 1 A cross-sectional view taken along the AA axis when the guide catheter replacement assist device is used in conjunction with the guide catheter and guidewire;

[0027] Figure 3 A schematic diagram of the structure of a switch element provided in an embodiment of the present application;

[0028] Figure 4 A schematic structural diagram of another switch element provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 A schematic structural diagram of the valve body of the switch member shown;

[0030] Figure 6 for Figure 4 A schematic structural diagram of the valve core of the switch member shown;

[0031] Figure 7Schematic diagram of the structure of the balloon provided in the embodiment of the present application Figure 1 ;

[0032] Figure 8 Schematic diagram of the structure of the balloon provided in the embodiment of the present application Figure 2 ;

[0033] Figure 9 The structural diagram of the balloon provided in the embodiment of the present application Figure 3 ;

[0034] Figure 10 The structural diagram of the balloon provided in the embodiment of the present application Figure 4 ;

[0035] Figure 11 The structural diagram of the balloon provided in the embodiment of the present application Figure 5 .

[0036] Among them, the reference numerals in the figures are:

[0037] 100 - Guide catheter replacement assist device; 110 - Balloon; 111 - Accommodation chamber; 112 - Channel; 113 - Perfusion tube; 114 - Expansion element; 1141 - Inner tube; 1143 - Opening; 1142 - Outer cover; 115 - Ribbon; 116 - Groove; 120 - Tube assembly; 121 - Lumen; 122 - Tube fitting; 1221 - Hypotube; 1222 - Metal wire; 123 - Switch ;124-first connector;1241-first through hole;1242-step;125-flexible part;1251-second through hole;126-second connector;1261-third through hole;127-valve body;1271-inner cavity;1272-opening;128-valve core;1281-fourth through hole;130-filling and unloading parts;131-connecting part;200-guide catheter;300-guide wire. DETAILED DESCRIPTION

[0038] The following describes in detail embodiments of the present application, examples of which 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 present application, and should not be construed as limiting the present application.

[0039] In the description of this application, 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 this application and simplifying the description, and do not indicate or imply 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 this application.

[0040] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0041] See also Figure 1 and Figure 2 The guide catheter replacement assist device 100 provided in an embodiment of the present application will now be described. The guide catheter replacement assist device 100 is used in conjunction with a guide catheter 200 and a guidewire 300. The guide catheter replacement assist device 100 includes a balloon 110, a tube assembly 120, and a charging and discharging component 130, which are sequentially connected from the distal end to the proximal end. The balloon 110 has an expandable accommodating cavity 111. The tube assembly 120 is used to be placed in the guide catheter 200, and the tube assembly 120 has a selectively closable lumen 121, which is in communication with the accommodating cavity 111. The charging and discharging component 130 is detachably connected to the tube assembly 120. The charging and discharging component 130 is used to inject fluid into the accommodating cavity 111 through the tube assembly 120 to press the guidewire 300 against the inner wall of the vessel, and remove fluid from the accommodating cavity 111 through the tube assembly 120 to release the guidewire 300 from the inner wall of the vessel.

[0042] It should be noted that after the interventional medical device penetrates the human skin and enters the human blood vessel, and enters the lesion site along the direction of the blood vessel, the entrance of the human skin is used as the reference point. The distal end can be understood as the end away from the reference point, and the proximal end can be understood as the end close to the reference point. The fluid generally includes one or more sterile solutions such as saline and contrast agent solution. This is not the only limitation. When it is desired to use fluoroscopy to observe the operation and volume changes of the balloon 110, a contrast agent solution can be used.

[0043] Compared with the prior art, the guide catheter replacement assisting device 100 provided in this embodiment is as follows: after the first guide catheter is inserted into the vessel and the guide wire 300 is loaded on the first guide catheter, if the operating physician needs to replace the first guide catheter due to reasons such as the inappropriate shape of the end of the first guide catheter, the operating physician can load the guide catheter replacement assisting device 100 provided in this application into the first guide catheter and place the balloon 110 between the distal end of the first guide catheter and the distal end of the guide wire 300, and then inject the fluid into the accommodating cavity 110 of the balloon 110 through the filling and unloading part 130. 11, so that the volume of balloon 110 increases, thereby pressing the guidewire 300 against the inner wall of the vessel. Then, the connection between the charging and discharging component 130 and the tube assembly 120 is released, the first guide catheter is removed from the guidewire 300, and the second guide catheter is loaded. Next, the charging and discharging component 130 is reconnected to the tube assembly 120, and the fluid in the accommodating chamber 111 is removed through the tube assembly 120 by the charging and discharging component 130, so that the volume of balloon 110 decreases, thereby releasing the guidewire 300 from the inner wall of the vessel. Finally, the guide catheter replacement assist device 100 is removed from the second guide catheter. The above operation can be completed independently by the operating physician, which is simple, time-saving, and can reduce the pain of the patient.

[0044] In another embodiment of this application, please refer to Figure 1 The tube assembly 120 includes a connected tube 122 and a switch 123 . The tube 122 is connected to the balloon 110 and has a lumen 121 . The switch 123 is detachably connected to the charging and discharging member 130 and is used to selectively close the proximal end of the lumen 121 .

[0045] It should be noted that the tubular member 122 is sealedly connected to the switch member 123. The tubular member 122 and the balloon 110 can be fixedly or detachably connected, and this arrangement can be configured as needed and is not limited to a single method. The switch member 123 and the charging and discharging member 130 can be detachably connected using various methods, such as a threaded connection or a snap connection, and can be configured as needed and is not limited to a single method.

[0046] When using the guide catheter replacement assisting device 100 provided in this embodiment, the operating physician inserts the guide catheter replacement assisting device 100 into the first guide catheter (not shown), and places the balloon 110 between the distal end of the first guide catheter and the distal end of the guide wire 300, and places the switch member 123 beyond the proximal end of the first guide catheter and outside the patient's body; then, the switch member 123 is opened, and the fluid is injected into the accommodating chamber 111 through the filling and discharging member 130, so that the volume of the balloon 110 increases to a level that can accommodate the guide catheter. The guide wire 300 is pressed against the inner wall of the blood vessel; then, the charging and discharging component 130 is removed from the switch component 123, the first guide catheter is withdrawn from the guide wire 300 and loaded into the second guide catheter (not shown); then, the charging and discharging component 130 is reconnected to the switch component 123, and the fluid in the accommodating cavity 111 is removed through the charging and discharging component 130 to reduce the volume of the balloon 110, thereby releasing the guide wire 300 from the inner wall of the blood vessel; finally, the guide catheter replacement auxiliary device 100 is withdrawn from the second guide catheter.

[0047] The guide catheter replacement auxiliary device 100 provided in this embodiment, by detachably connecting the disassembly part and the switch part 123, allows the operating physician to remove the filling and disassembly part 130 from the switch part 123 when the switch part 123 is in the closed state, and then directly perform the replacement operation of the guide catheter 200, which is simple to operate and takes little time.

[0048] In another embodiment of this application, please refer to Figure 1 and Figure 3 The switch member 123 includes a first connecting head 124, a flexible member 125 and a second connecting head 126. A first through hole 1241 is provided in the first connecting head 124, and a step 1242 is provided on the inner wall of the first through hole 1241. The flexible member 125 is provided in the first through hole 1241, and a second through hole 1251 that can communicate with the first through hole 1241 is provided in the flexible member 125; the second connecting head 126 is movably installed in the first through hole 1241, and the second connecting head 126 can be moved to press the flexible member 125 against the step 1242 to close the second through hole 1251.

[0049] It should be noted that the flexible member 125 can be made of materials such as silicone or rubber, and can be selected according to needs, and is not limited here.

[0050] When using the guide catheter replacement assist device 100 provided in this embodiment, the first connector 124 can be connected to the tube 122, and the first through hole 1241 can be connected to the lumen 121. In this way, the operating physician can move the second connector 126 toward the first connector 124 to squeeze the second through hole 1251 until it is closed, thereby sealing the lumen 121. The operating physician can move the second connector 126 away from the first connector 124 to restore the second through hole 1251 to a conductive state, thereby opening the lumen 121. Of course, the first connector 124 can also be detachably connected to the charging and discharging component 130 to block or open the internal space of the charging and discharging component 130.

[0051] The guide catheter replacement auxiliary device 100 with the above structure realizes the opening or closing of the second through hole 1251 through the axial movement of the second connecting head 126, thereby blocking or opening the space connected to the first through hole 1241, thereby facilitating the reduction of the radial size of the switch member 123 and enabling the guide catheter 200 to pass through the outer periphery of the switch member 123.

[0052] In another embodiment of this application, please refer to Figures 1 to 3 The second connector 126 is provided with a third through hole 1261 that communicates with the second through hole 1251. One of the second connector 126 and the first connector 124 is connected to the tube 122, and the other is detachably connected to the charging and discharging component 130. With the guide catheter replacement assist device 100 having the above structure, the operating physician can connect or disconnect the charging and discharging component 130 and the balloon 110 by opening or closing the second through hole 1251, thus facilitating operation.

[0053] In another embodiment of the present application, the second connector 126 is threadedly connected to the first connector 124 or is detachably snap-connected.

[0054] It should be noted that one end of the second connector 126 is located outside the first through hole 1241, and the other end extends into the first through hole 1241 and is threadedly connected or detachably snapped into the first connector 124, so that the operating physician can operate it by rotating or pushing and pulling the second connector 126 located outside the first through hole 1241.

[0055] When the second connector 126 is threadedly connected to the first connector 124, the second connector 126 is screwed into the first through hole 1241, pressing the flexible member 125 to close the second through hole 1251. Conversely, the second connector 126 is screwed out of the first through hole 1241, loosening the flexible member 125 to open the second through hole 1251.

[0056] When the second connector 126 and the first connector 124 are detachably connected, one of the second connector 126 and the first connector 124 is provided with a buckle (not shown), and the other is provided with a buckle hole (not shown). The buckle hole corresponds to the position of the buckle. During use, the second connector 126 moves toward the first connector 124, so that the buckle is buckled into the buckle hole, and the second through hole 1251 remains closed; the second connector 126 moves away from the first connector 124, driving the buckle to re-escape from the buckle hole, and the second through hole 1251 opens. When the second connector 126 and the first connector 124 are detachably connected, one of the two can also be provided with a slide rail (not shown) to guide the other to move until the buckle is buckled into the buckle. With the guide catheter replacement auxiliary device 100 with the above structure, the operating physician can open or close the second through hole 1251 by rotating or pushing and pulling the second connector 126, which is convenient and quick to operate.

[0057] In another embodiment of this application, please refer to Figure 4 and Figure 5 The switch member 123 includes a valve body 127 provided with an inner cavity 1271 and a valve core 128 provided with a fourth through hole 1281. One end of the valve body 127 is connected to the pipe fitting 122 and the other end is detachably connected to the filling and unloading member 130. The valve core 128 is rotatably arranged in the valve body 127, and the fourth through hole 1281 is separated from or connected with the inner cavity 1271 as the valve core 128 rotates.

[0058] It should be noted that the valve core 128 can be rotated in a variety of ways, such as by providing an opening 1272 on the valve body 127 that communicates with the inner cavity 1271, with the valve core 128 partially extending through the opening 1272 from the inner cavity 1271 of the valve body 127. The operating physician can rotate the portion of the valve core 128 extending through the opening 1272 to rotate the valve core 128 as a whole. Of course, other methods can also be used to achieve rotation of the valve core 128, which are not intended to be the sole limitation. When the valve core 128 rotates until the inner cavity 1271 is connected to the fourth through hole 1281, the switch 123 is in the open state; when the valve core 128 rotates until the inner cavity 1271 is separated from the fourth through hole 1281, the switch 123 is in the closed state. Using the guide catheter replacement auxiliary device 100 with the above structure, the operating physician can easily open or close the switch 123, making operation convenient and quick.

[0059] In another embodiment of this application, please refer to Figure 1 The tube 122 is a hypotube 1221 having a lumen 121 , and a metal wire 1222 extending axially along the hypotube 1221 is provided in the wall of the hypotube 1221 , and the metal wire 1222 extends to the distal end of the balloon 110 .

[0060] The guide catheter replacement assist device 100 provided in this embodiment can enhance the supporting force of the balloon 110 by extending the metal wire 1222 inside the inner wall of the hypotube 1221 to the distal end of the balloon 110 .

[0061] In another embodiment of this application, please refer to Figure 1 and Figure 2 The balloon 110 is provided with a channel 112 separated from the accommodating cavity 111, and the channel 112 is used to maintain vascular conduction; wherein, the channel 112 is provided inside the balloon 110, or the channel 112 is provided on the outer wall of the balloon 110.

[0062] When the guide catheter replacement auxiliary device 100 with the above structure is used, when the balloon 110 presses the guide wire 300 against the inner wall of the blood vessel, the blood in the patient's blood vessel can flow through the channel 112, which can prevent the balloon 110 from completely blocking the blood vessel and causing harm to the patient, further alleviating the patient's pain.

[0063] As a specific embodiment of setting the channel 112 inside the balloon 110, please refer to Figure 1 and Figure 2 The balloon 110 includes an infusion tube 113 and an expansion member 114. The expansion member 114 includes an inner tube 1141 and an outer cover 1142 that is sealed and sleeved on the outer periphery of the inner tube 1141. The proximal end of the inner tube 1141 is sealed and connected to the distal end of the tube assembly 120. The distal end of the inner tube 1141 is closed, and an opening 1143 is provided on the wall of the inner tube 1141. The infusion tube 113 penetrates into the interior of the inner tube 1141 from the distal end of the inner tube 1141 and extends to the lumen 121 of the tube assembly 120 and then passes through the lumen 121.

[0064] With the guide catheter replacement auxiliary device 100 having the above-mentioned structure, the fluid can pass through the lumen 121 of the tube assembly 120, the internal space of the inner tube 1141, and the opening 1143 and then enter the space between the inner tube 1141 and the outer cover 1142, thereby changing the volume of the balloon 110. At the same time, the blood in the blood vessel can flow through one end of the perfusion tube 113 to the other end of the perfusion tube 113 without causing blockage of the blood vessel.

[0065] In another embodiment of this application, please refer to Figures 7 to 11 When the outer wall of the balloon 110 is provided with a channel 112, the outer wall of the balloon 110 is provided with a plurality of ridges 115, and the channel 112 is formed between two adjacent ridges 115, and the outer surface of the plurality of ridges 115 is projected as a closed loop in the axial direction of the tube assembly 120; or, the outer wall of the balloon 110 is provided with a groove 116, and the internal space of the groove 116 forms the channel 112, and the outer surface of the balloon 110 is projected as a closed loop in the axial direction of the tube assembly 120.

[0066] It should be noted that the ridges 115 can be provided continuously or divided into several sections. The number of the grooves 116 can be one or more and can be provided as required, which is not limited here.

[0067] The guide catheter replacement auxiliary device 100 provided in this embodiment has a surface of the balloon 110 that contacts the inner wall of the blood vessel projected as a closed ring in the axial direction of the tube assembly 120, so that when the guide wire 300 is located at various positions on the periphery of the balloon 110, the balloon 110 can press the guide wire 300 against the inner wall of the blood vessel, thereby achieving a good fixing effect on the guide wire 300 and high reliability.

[0068] In another embodiment of this application, please refer to Figure 1 The charging and discharging part 130 includes a connecting part 131 and an injection part, wherein the connecting part 131 is used to seal the injection part and the switch part 123.

[0069] It should be noted that the connector 131 can be configured as a Luer connector or a needle holder, and the injection component can be a syringe or an injection pump, etc., which can be selected as needed and are not limited to the above. The guide catheter replacement auxiliary device 100 with the above structure is convenient for filling and unloading fluids and has good sealing performance.

[0070] This embodiment further provides a method for replacing a guide catheter. The method for replacing a guide catheter employs the aforementioned guide catheter replacement auxiliary device 100. The method for replacing a guide catheter includes:

[0071] Loading a first guide catheter into the vessel, loading a guide wire 300 into the first guide catheter, and making the distal end of the guide wire 300 extend beyond the distal end of the first guide catheter;

[0072] The guide catheter replacement assist device 100 is loaded into the first guide catheter, and the balloon 110 is interposed between the distal end of the first guide catheter and the distal end of the guide wire 300;

[0073] The filling and discharging member 130 is used to inject the fluid into the accommodating cavity 111 of the balloon 110 through the tube assembly 120, so that the volume of the accommodating cavity 111 is increased and the guide wire 300 is pressed against the inner wall of the vessel;

[0074] The connection between the charging and discharging member 130 and the tube assembly 120 is released, the first guide catheter is withdrawn from the guidewire 300, and a second guide catheter is loaded on the guidewire 300 until the distal end of the second guide catheter approaches the proximal end of the balloon 110;

[0075] Reconnect the filling and discharging component 130 to the tube assembly 120, and use the filling and discharging component 130 to remove the fluid from the accommodating cavity 111 through the tube assembly 120 to release the guide wire 300 from the inner wall of the vessel;

[0076] The guide catheter exchange assist device 100 is withdrawn from the second guide catheter.

[0077] The operating physician uses the above-mentioned guide catheter replacement auxiliary device 100 and adopts the above-mentioned method to independently complete the replacement of the guide catheter 200. The operation is simple, time-saving, and can alleviate the patient's pain. Moreover, when the balloon 110 is provided with a channel 112, while the guide catheter 200 is being replaced, the blood in the patient's blood vessels can flow through the channel 112 of the balloon 110, which can further alleviate the patient's pain and avoid harm to the patient due to vascular blockage.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A guide catheter replacement assist device for use with a guide catheter and a guide wire, characterized by: The guide catheter replacement auxiliary device includes a balloon, a tube assembly, and a charging and discharging component connected in sequence from the distal end to the proximal end; the balloon has an expandable accommodating cavity, the tube assembly is used to be placed in the guide catheter, and the tube assembly has a selectively closable lumen, the lumen is communicated with the accommodating cavity, the charging and discharging component is detachably connected to the tube assembly, and the charging and discharging component is used to inject fluid into the accommodating cavity through the tube assembly to press the guide wire onto the inner wall of the blood vessel, and remove fluid from the accommodating cavity through the tube assembly to release the guide wire from the inner wall of the blood vessel; The tube assembly includes a tube member and a switch member connected to each other, the tube member is sealedly connected to the switch member, the tube member is connected to the balloon and has the lumen, the switch member is detachably connected to the filling and discharging member and is used to selectively close the proximal end of the lumen; The switch member includes a first connector, a flexible member, and a second connector. The first connector is provided with a first through hole, and an inner wall of the first through hole is provided with a step. The flexible member is provided in the first through hole, and a second through hole is provided in the flexible member that is communicative with the first through hole. The second connector is movably mounted in the first through hole, and the second connector is movable to press the flexible member against the step to close the second through hole. The balloon is provided with a channel separated from the accommodating cavity, and the channel is used to maintain the conduction of the blood vessel. The outer wall of the balloon is provided with multiple ridges, and the channel is formed between two adjacent ridges, and the outer wall of the multiple ridges is a closed loop in the axial projection of the tube assembly.

2. The guide catheter replacement assist device according to claim 1, characterized in that: The second connector is provided with a third through hole communicating with the second through hole. One of the second connector and the first connector is connected to the pipe fitting, and the other of the second connector and the first connector is detachably connected to the charging and discharging piece.

3. The guide catheter replacement assist device according to claim 1, characterized in that: The second connector is threadably connected to the first connector or is detachably clamped.

4. The guide catheter replacement assist device according to claim 1, wherein: The switch component includes a valve body provided with an inner cavity and a valve core provided with a fourth through hole. One end of the valve body is connected to the pipe fitting and the other end is detachably connected to the filling and unloading component. The valve core is rotatably arranged in the valve body, and the fourth through hole is separated from or connected to the inner cavity as the valve core rotates.

5. The guide catheter replacement assist device according to claim 1, characterized in that: The tube is a hypotube having the lumen, and a tube wall of the hypotube is provided with a metal wire extending axially along the hypotube, and the metal wire extends to the distal end of the balloon.

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