CN215386900U - Guide catheter replacement auxiliary device - Google Patents

Abstract

The application belongs to the technical field of interventional medical equipment and provides a guide catheter replacing auxiliary device which comprises a fixing part, a pipe assembly and a charging and discharging part which are sequentially connected; the fixing piece is provided with an expandable accommodating cavity; the tube assembly is used for being placed in the guide tube and is provided with a tube cavity capable of being selectively closed, and the tube cavity is communicated with the accommodating cavity; the charging and discharging member is detachably connected with the tube assembly, and is used for injecting fluid into the accommodating cavity through the tube assembly so that the guide wire is pressed on the inner wall of the vessel, and removing the fluid from the accommodating cavity through the tube assembly so that the guide wire is released from the inner wall of the vessel. By adopting the auxiliary device for replacing the guide catheter, the guide catheter can be independently replaced by an operating doctor, the operation is simple, the consumed time is short, and the pain of a patient can be relieved.

Description

Guide catheter replacement auxiliary device

Technical Field

The application relates to the technical field of interventional medical equipment, in particular to a guide catheter replacement auxiliary device.

Background

In interventional therapy of coronary heart disease and other diseases, a guide catheter and a guide wire are often used in combination with an expansion balloon or other interventional medical devices, when in use, the guide catheter is generally firstly inserted into a blood vessel until the distal end of the guide catheter approaches a diseased part, then the guide wire with smaller outer diameter is loaded in the guide catheter until the distal end of the guide wire further approaches the diseased part, and then the expansion balloon or other interventional medical devices can be loaded on the guide wire, and the diseased part is further treated by utilizing the expansion balloon or other interventional medical devices. For example, in the procedure of Percutaneous Transluminal Coronary Angioplasty (PTCA), after a guide wire is loaded on a guide catheter, sometimes an operating physician needs to replace the guide catheter due to an inappropriate size or distal end shape of the guide catheter, but when an old guide catheter is withdrawn, the guide wire is necessarily withdrawn, and after a new guide catheter is inserted, the guide wire needs to be threaded in place again, which complicates the operation, prolongs the operation time, and increases the pain of a patient.

To avoid the guide wire losing its original position when replacing the guide catheter, current practice involves using a longer guide wire, the portion of which extending outside the patient must be at least slightly longer than the full length of the lumen of the guide catheter to be used. Thus, the operating physician or his/her assistant can hold the guide wire at all times during the operation to maintain the original positioning of the guide wire, but the above-mentioned method requires the operating physician to cooperate with the assistant, and is cumbersome and long in operation time.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present application is to provide a guide catheter replacing assisting device and a method for replacing a guide catheter, so as to solve the technical problems of complex operation and long operation time due to the cooperation of multiple users required for the operation of replacing the guide catheter in the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the guide catheter replacing auxiliary device is used together with a guide catheter and a guide wire, and comprises a fixing part, a pipe component and a charging and discharging part which are sequentially connected from the far end to the near end; the anchor has an expandable receiving lumen, the tube assembly is for placement within the catheter, and the tube assembly has a selectively closable lumen in communication with the receiving lumen, the charging and discharging member is removably coupled to the tube assembly, the charging and discharging member is for injecting fluid through the tube assembly into the receiving lumen to press the guidewire against the inner wall of the vessel, and removing fluid from the receiving lumen through the tube assembly to release the guidewire from the inner wall of the vessel.

In one embodiment, the tube assembly includes a tube member coupled to the securing member and having the lumen, and a switch member removably coupled to the charging and discharging member for selectively closing a proximal end of the lumen.

In one embodiment, the switch member comprises a first connector, a flexible member and a second connector, wherein a first through hole is formed in the first connector, a step is formed on the inner wall of the first through hole, the flexible member is arranged in the first through hole, and a second through hole which can be communicated with the first through hole is formed in the flexible member; the second connector is movably arranged in the first through hole, and the second connector can move to enable the flexible piece to be tightly pressed on the step, so that the second through hole is closed.

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

In one embodiment, the second connector is screwed or detachably clamped with the first connector.

In one embodiment, the switch member includes a valve body having an inner cavity and a valve core having a fourth through hole, one end of the valve body is connected to the pipe member and the other end is detachably connected to the charging and discharging member, the valve core is rotatably disposed in the valve body, and the fourth through hole is separated from or communicated with the inner cavity along with the rotation of the valve core.

In one embodiment, the tube is a hypotube, the hypotube has the lumen, and a wire extending in an axial direction of the hypotube is disposed in a wall of the hypotube, and the wire extends to a distal end of the fixing member.

In one embodiment, the fixing member is provided with a channel which is separated from the accommodating cavity and is used for keeping the vessel in conduction; the channel is arranged in the fixing piece, or the channel is arranged on the outer wall of the fixing piece.

In one embodiment, when the outer wall of the fixing part is provided with the channel, the outer wall of the fixing part is provided with a plurality of convex strips, the channel is formed between two adjacent convex strips, and the axial projection of the outer walls of the convex strips on the pipe assembly is a closed loop; or the outer wall of the fixing piece is provided with a groove, the inner space of the groove forms the channel, and the axial projection of the outer wall of the fixing piece on the pipe assembly is a closed loop.

In one embodiment, when the channel is arranged in the fixing part, the fixing part comprises a perfusion tube and an expansion part, the expansion part comprises an inner tube and an outer cover arranged on the periphery of the inner tube in a sealing mode, the near end of the inner tube is connected with the far end of the tube assembly in a sealing mode, the far end of the inner tube is closed, an opening communicated with the outer cover is formed in the wall of the inner tube, the perfusion tube penetrates into the inner tube from the far end of the inner tube and extends to the tube cavity and then penetrates out of the tube cavity, and the channel is formed in the perfusion tube.

In one embodiment, the charging and discharging member includes a connecting member for sealingly connecting the injection member with the switching member and an injection member.

In order to achieve the above object, the present application also provides a method of replacing a guide catheter, the method of replacing a guide catheter using the above guide catheter replacement assistance device, the method of replacing a guide catheter comprising:

loading a first guide catheter within the vessel, loading a guidewire within the first guide catheter with a distal end of the guidewire beyond a distal end of the first guide catheter;

loading the guide catheter exchange aid within the first guide catheter with a fixation member interposed between the distal end of the first guide catheter and the distal end of the guidewire;

injecting fluid into the accommodating cavity of the fixing piece through the pipe assembly by using the filling and unloading piece so as to compress the guide wire on the inner wall of the vessel after the volume of the accommodating cavity is increased;

disconnecting the charging and discharging member from the tube assembly, withdrawing the first guide catheter from the guide wire, and loading a second guide catheter over the guide wire until the distal end of the second guide catheter is proximate to the proximal end of the anchor;

reconnecting the stent to the tube assembly, removing fluid from the receiving lumen through the tube assembly using the stent to release the guidewire from the inner wall of the vessel;

withdrawing the guide catheter replacement aid from the second guide catheter.

The application provides a method for replacing a guide catheter and a guide catheter, which has the advantages that: compared with the prior art, after the first guide catheter is inserted into the vessel and the guide wire is loaded on the first guide catheter, when an operating physician needs to replace the first guide catheter due to reasons such as improper end shape of the first guide catheter, the operating physician can load the guide catheter replacement auxiliary device provided by the application into the first guide catheter and enable the fixing piece to be between the distal end of the first guide catheter and the distal end of the guide wire, then inject fluid into the accommodating cavity of the fixing piece through the filling and unloading piece to enable the volume of the fixing piece to be increased so as to press the guide wire on the inner wall of the vessel, then remove the connection between the filling and unloading piece and the tube assembly, withdraw the first guide catheter from the guide wire and load the first guide catheter into the second guide catheter; then, the filling and unloading piece is connected to the tube assembly again, and the fluid in the accommodating cavity is removed through the tube assembly through the filling and unloading piece, so that the volume of the fixing piece is reduced, and the guide wire is released from the inner wall of the vessel; and finally withdrawing the guide catheter replacement assisting device from the second guide catheter. The operation can be independently completed by an operating doctor, the operation is simple, the time consumption is short, and the pain of patients can be relieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a guide catheter replacement assisting device provided in an embodiment of the present application in cooperation with a guide catheter and a guide wire;

FIG. 2 is a cross-sectional view taken along the line A-A of the guide catheter replacement assistance device of FIG. 1 in use with a guide catheter and a guidewire;

fig. 3 is a schematic structural diagram of a switch provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of another switch provided in the embodiment of the present application;

FIG. 5 is a schematic view of the valve body of the switch member shown in FIG. 4;

FIG. 6 is a schematic view of the valve core of the switching element of FIG. 4;

fig. 7 is a first schematic structural diagram of a fixing element according to an embodiment of the present application;

fig. 8 is a second schematic structural diagram of a fixing element according to an embodiment of the present application;

FIG. 9 is a third schematic structural view of a fastener provided in the embodiments of the present application;

FIG. 10 is a fourth schematic structural view of a fastener provided in the embodiments of the present application;

fig. 11 is a schematic structural diagram of a fixing element according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

100-guide catheter replacement assistance; 110-a fixture; 111-a housing chamber; 112-channel; 113-a perfusion tube; 114-an expansion member; 1141-inner tube; 1143-opening a hole; 1142-a housing; 115-ribs; 116-a groove; 120-a tube assembly; 121-lumen; 122-a tubular; 1221-a hypotube; 1222-a wire; 123-a switch member; 124-a first connector; 1241-first via; 1242-step; 125-a flexible member; 1251-a second via; 126-a second connector; 1261-a third via; 127-a valve body; 1271-lumen; 1272-opening; 128-a valve core; 1281-fourth via; 130-a charging and discharging member; 131-a connector; 200-a guide catheter; 300-guide wire.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, a guide catheter replacement assistance device 100 according to an embodiment of the present application will now be described. The guide catheter replacement assisting device 100 is used together with the guide catheter 200 and the guide wire 300, and the guide catheter replacement assisting device 100 comprises a fixing member 110, a tube assembly 120 and a charging and discharging member 130 which are sequentially connected from the far end to the near end; the fixing member 110 has an expandable accommodating cavity 111, the tube assembly 120 is used for being placed in the guiding catheter 200, the tube assembly 120 has a selectively-closed lumen 121, the lumen 121 is communicated with the accommodating cavity 111, the charging and discharging member 130 is detachably connected with the tube assembly 120, the charging and discharging member 130 is used for injecting fluid into the accommodating cavity 111 through the tube assembly 120 so as to enable the guide wire 300 to be pressed on the inner wall of the vessel, and removing the fluid from the accommodating cavity 111 through the tube assembly 120 so as to enable the guide wire 300 to be released from the inner wall of the vessel.

It should be noted that, after the interventional medical device is inserted through the skin of the human body and enters the blood vessel of the human body, and enters the lesion part along the direction of the blood vessel, the inserted inlet of the skin of the human body is used as a reference point, the far end can be understood as the end far away from the reference point, and the near end can be understood as the end close to the reference point. The fixing member may be a balloon or an elastic arm, which is not limited herein. The fluid typically comprises one or more of saline, contrast media solution, and the like, in a sterile solution. And are not intended to be limited solely thereto. A contrast solution may be used when it is desired to observe the movement and volume change of the fixture 110 using fluoroscopy.

Compared with the prior art, when the first guide catheter is inserted into the vessel and the guide wire 300 is loaded on the first guide catheter, and the operating physician needs to replace the first guide catheter due to the improper shape of the end of the first guide catheter, the operating physician may load the guide catheter replacement assistance device 100 provided in this embodiment into the first guide catheter with the fixing member 110 interposed between the distal end of the first guide catheter and the distal end of the guide wire 300, then inject fluid into the accommodating cavity 111 of the fixing member 110 through the charging and discharging member 130 to increase the volume of the fixing member 110 and press the guide wire 300 against the inner wall of the vessel, then release the connection between the charging and discharging member 130 and the tube assembly 120, withdraw the first guide catheter from the guide wire 300 and load the first guide catheter into the second guide catheter; then, the charging and discharging member 130 is connected to the tube assembly 120 again, and the fluid in the accommodating cavity 111 is removed through the tube assembly 120 by the charging and discharging member 130, so that the volume of the fixing member 110 is reduced, and the guide wire 300 is released from the inner wall of the vessel; and finally withdraw the guide catheter replacement assistance device 100 from within the second guide catheter. The operation can be independently completed by an operating doctor, the operation is simple, the time consumption is short, and the pain of patients can be relieved.

In another embodiment of the present application, referring to fig. 1, the tube assembly 120 includes a tube member 122 and a switch member 123 connected together, the tube member 122 is connected to the fixing member 110 and has a lumen 121, and the switch member 123 is detachably connected to the filling and discharging member 130 and is used for selectively closing the proximal end of the lumen 121.

It should be noted that the pipe 122 is connected with the switch 123 in a sealing manner, and the pipe 122 and the fixing element 110 may be fixedly connected or detachably connected, and may be configured as required, which is not limited herein. The switch member 123 and the charging and discharging member 130 can be detachably connected in various ways, such as a threaded connection or a snap connection, and can be configured as required, which is not limited herein.

In the guiding catheter replacement assisting device 100 provided in this embodiment, in use, the operating physician passes the guiding catheter replacement assisting device 100 into a first guiding catheter (not shown), and makes the fixing member 110 be located between the distal end of the first guiding catheter and the distal end of the guide wire 300, and makes the switch member 123 be located outside the patient's body beyond the proximal end of the first guiding catheter; then, the switch 123 is opened, and fluid is injected into the accommodating cavity 111 through the filling and discharging piece 130, so that the volume of the fixing piece 110 is increased to enable the guide wire 300 to be pressed on the inner wall of the vessel; next, the loading and unloading member 130 is detached from the switch member 123, and the first guide catheter is withdrawn from the guide wire 300 and loaded into a second guide catheter (not shown); then, the charging and discharging member 130 is connected to the switch member 123 again, and the fluid in the accommodating cavity 111 is removed through the charging and discharging member 130, so that the volume of the fixing member 110 is reduced, and the guide wire 300 is released from the inner wall of the vessel; and finally withdraw the guide catheter replacement assistance device 100 from within the second guide catheter.

In the guide catheter replacement assistance device 100 according to the present embodiment, the detachable member is detachably connected to the switch member 123, so that the operating physician can directly perform the replacement operation of the guide catheter 200 after detaching the charging and detaching member 130 from the switch member 123 in the state where the switch member 123 is closed, and the operation is simple and time-consuming.

In another embodiment of the present application, referring to fig. 1 and fig. 3, the switch 123 includes a first connector 124, a flexible member 125 and a second connector 126, the first connector 124 is provided with a first through hole 1241, an inner wall of the first through hole 1241 is provided with a step 1242, the flexible member 125 is provided in the first through hole 1241, and the flexible member 125 is provided with a second through hole 1251 capable of communicating with the first through hole 1241; the second connecting head 126 is movably installed in the first through hole 1241, and the second connecting head 126 can move to press the flexible member 125 against the step 1242, so that the second through hole 1251 is closed.

It should be noted that the flexible member 125 may be made of a material such as silicone or rubber, and may be selected according to the requirement, which is not limited herein.

In the guide catheter replacement assisting device 100 provided by this embodiment, when in use, the first connector 124 can be connected to the tube 122, and the first through hole 1241 is communicated with the lumen 121, so that the operating physician moves the second connector 126 toward the direction close to the first connector 124, and the second through hole 1251 can be pressed to be closed, thereby closing the lumen 121; the operator moves the second connector 126 away from the first connector 124 to restore the second through hole 1251 to a conducting state, so that the lumen 121 is in an open state. Of course, the first connector 124 can also be detachably connected to the charging unit 130 for closing or opening the inner space of the charging unit 130.

With the guide catheter replacement assistance device 100 having the above-described structure, the second through hole 1251 is opened or closed by the axial movement of the second connector 126, and the space connected to the first through hole 1241 is closed or opened, so that the size of the switch 123 in the radial direction is reduced, and the guide catheter 200 can pass through the outer periphery of the switch 123.

In another embodiment of the present application, referring to fig. 1 to 3, the second connector 126 is provided with a third through hole 1261 communicated with the second through hole 1251, one of the second connector 126 and the first connector 124 is connected to the pipe 122, and the other is detachably connected to the charging and discharging member 130. With the guide catheter replacement assistance device 100 having the above-described structure, the operator can easily operate the device by opening or closing the second through hole 1251 to communicate or separate the filler/discharger member 130 with or from the fixing member 110.

In another embodiment of the present application, the second connector 126 is screwed or detachably engaged with the first connector 124.

It should be noted that one end of the second connector 126 is located outside the first through hole 1241, and the other end of the second connector 126 extends into the first through hole 1241 and is screwed or detachably clamped with the first connector 124, so that the operator can operate by rotating or pushing and pulling the second connector 126 located outside the first through hole 1241 when using the medical device.

When the second connector 126 is screwed to the first connector 124, the second connector 126 is screwed into the first through hole 1241 to press the flexible member 125, so that the second through hole 1251 is closed. Conversely, the second connector 126 is screwed out of the first through hole 1241, and the flexible member 125 is released, so that the second through hole 1251 is opened.

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, when in use, the second connector 126 moves towards the first connector 124, so that the buckle is buckled in the buckle hole, and the second through hole 1251 is kept closed; the second connector 126 is far away from the first connector 124, and drives the buckle to be taken out of the buckle hole again, so that the second through hole 1251 is opened. When the second connector 126 and the first connector 124 are detachably engaged, one of the two connectors may further be provided with a slide rail (not shown) to guide the other one of the two connectors to move to the engagement portion for engaging with the engagement portion. With the guide catheter replacement assistance device 100 having the above-described structure, an operator can open or close the second through hole 1251 by rotating or pushing and pulling the second connector 126, and the operation is convenient and quick.

In another embodiment of the present application, referring to fig. 4 and 5, the switch member 123 includes a valve body 127 having an inner cavity 1271 and a valve core 128 having a fourth through hole 1281, one end of the valve body 127 is connected to the pipe member 122 and the other end is detachably connected to the charging and discharging member 130, the valve core 128 is rotatably disposed in the valve body 127, and the fourth through hole 1281 is separated from or communicated with the inner cavity 1271 along with the rotation of the valve core 128.

It should be noted that the valve core 128 can be rotated in various ways, such as providing an opening 1272 in the valve body 127, the valve core 128 partially passing through the opening 1272 from the inner cavity 1271 of the valve body 127, and operating the physician to rotate the portion of the valve core 128 passing through the opening 1272 to rotate the valve core 128 as a whole, although other ways of rotating the valve core 128 may be used, and the limitation is not limited herein. When the valve core 128 rotates to the inner cavity 1271 to be communicated with the fourth through hole 1281, the switch member 123 is in an open state; when the spool 128 is rotated to a position where the bore 1271 is separated from the fourth through-hole 1281, the switching member 123 is in an off state. With the guide catheter replacement assistance device 100 of the above-described structure, the operator can easily open or close the switch member 123, and the operation is convenient and quick.

In another embodiment of the present application, referring to fig. 1, the tube 122 is a hypotube 1221, the hypotube 1221 has a lumen 121, and a wire 1222 extending axially along the hypotube 1221 is disposed in a wall of the hypotube 1221, the wire 1222 extending to a distal end of the fixing element 110.

The guide catheter replacement assistance device 100 according to the present embodiment can increase the supporting force of the fixing member 110 by extending the wire 1222 in the inner wall of the hypotube 1221 to the distal end of the fixing member 110.

In another embodiment of the present application, referring to fig. 1 and fig. 2, the fixing member 110 has a channel 112 separated from the accommodating cavity 111, and the channel 112 is used for keeping the vessel in conduction; wherein, the inside of the fixing member 110 is provided with a channel 112, or the outer wall of the fixing member 110 is provided with a channel 112.

By adopting the guide catheter replacing auxiliary device 100 with the structure, when the fixing member 110 presses the guide wire 300 against the inner wall of the vessel, blood in the vessel of the patient can circulate through the channel 112, so that the fixing member 110 can be prevented from completely blocking the vessel to cause injury to the patient, and the pain of the patient can be further relieved.

Referring to fig. 1 and 2, as one specific embodiment of the channel 112 disposed inside the fixing member 110, the fixing member 110 includes an irrigation tube 113 and an expansion member 114, the expansion member 114 includes an inner tube 1141 and an outer cover 1142 disposed around the inner tube 1141, and the proximal end of the inner tube 1141 is hermetically connected to the distal end of the tube assembly 120; the distal end of the inner tube 1141 is closed, and the wall of the inner tube 1141 is provided with an opening 1143 communicated with the inner side of the outer cover 1142; the irrigation tube 113 passes from the distal end of the inner tube 1141 into the interior of the inner tube 1141 and extends to the lumen 121 of the tube assembly 120 and out of the lumen 121, the interior of the irrigation tube 113 forming the channel 112.

With the guide catheter replacement assistance device 100 having the above-described structure, fluid can enter the space between the inner tube 1141 and the outer cover 1142 through the lumen 121 of the tube assembly 120, the inner space of the inner tube 1141, and the opening 1143, thereby changing the volume of the fixing member 110, and at the same time, blood in the vessel can flow into the other end of the perfusion tube 113 through one end of the perfusion tube 113, so that the vessel is not blocked.

In another embodiment of the present application, referring to fig. 7 to 11, when the outer wall of the fixing member 110 is provided with the channel 112, the outer wall of the fixing member 110 is provided with a plurality of convex strips 115, the channel 112 is formed between two adjacent convex strips 115, and the outer surfaces of the plurality of convex strips 115 are projected in the axial direction of the tube assembly 120 to form a closed loop; or, the outer wall of the fixing member 110 is provided with a groove 116, the inner space of the groove 116 forms the channel 112, and the outer surface of the fixing member 110 is a closed loop in the axial projection of the pipe assembly 120.

It should be noted that the protruding strips 115 may be disposed continuously or may be disposed in several sections. The number of the grooves 116 may be one or more, and may be set as needed, which is not limited herein.

In the guiding catheter replacement assisting device 100 provided by this embodiment, the projection of the surface of the fixing member 110, which is in contact with the inner wall of the vessel, in the axial direction of the tube assembly 120 is a closed ring, so that when the guide wire 300 is located at each position of the periphery of the fixing member 110, the fixing member 110 can press the guide wire 300 against the inner wall of the vessel, and the guide wire 300 is fixed effectively and reliably.

In another embodiment of the present application, referring to fig. 1, the charging and discharging member 130 includes a connecting member 131 and an injection member, wherein the connecting member 131 is used for sealing the injection member with the switch member 123,

it should be noted that the connecting element 131 may be configured as a luer connector or a needle holder, and the injection element may be a syringe or a syringe pump, etc., and may be selected according to the needs, which is not limited herein. The guide catheter replacement assisting device 100 having the above structure is convenient for fluid filling and discharging and has good sealing performance.

The present embodiment also provides a method for replacing a guide catheter, the method for replacing a guide catheter using the guide catheter replacement assistance device 100, the method for replacing a guide catheter comprising:

loading a first guide catheter within the vessel, loading the guidewire 300 within the first guide catheter with the distal end of the guidewire 300 beyond the distal end of the first guide catheter;

loading the guide catheter exchange aid 100 in the first guide catheter with the fixing member 110 interposed between the distal end of the first guide catheter and the distal end of the guide wire 300;

injecting fluid into the accommodating cavity 111 of the fixing member 110 through the tube assembly 120 by using the filling and discharging member 130, so that the guide wire 300 is pressed against the inner wall of the vessel after the accommodating cavity 111 is enlarged;

disconnecting the charging and discharging member 130 from the tube assembly 120, withdrawing the first guide catheter from the guide wire 300, and loading the second guide catheter over the guide wire 300 until the distal end of the second guide catheter is proximal to the proximal end of the anchor 110;

reconnecting the stent 130 to the tube assembly 120, removing fluid from the receiving lumen 111 through the tube assembly 120 using the stent 130 to release the guidewire 300 from the inner wall of the vessel;

the guide catheter replacement assistance device 100 is withdrawn from the second guide catheter.

The operating physician can independently complete the replacement of the guiding catheter 200 by using the guiding catheter replacement assisting device 100 and adopting the method, the operation is simple, the time consumption is short, and the pain of the patient can be relieved; when the fixing member 110 is provided with the channel 112, the blood in the patient's vessel can flow through the channel 112 of the fixing member 110 while the guiding catheter 200 is replaced, so that the pain of the patient can be further relieved, and the injury of the patient due to vessel blockage can be avoided.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A guide catheter replacement assistance device for use with a guide catheter and a guidewire, comprising: the guide catheter replacing auxiliary device comprises a fixing piece, a pipe assembly and a charging and discharging piece which are sequentially connected from the far end to the near end; the anchor has an expandable receiving lumen, the tube assembly is for placement within the catheter, and the tube assembly has a selectively closable lumen in communication with the receiving lumen, the charging and discharging member is removably coupled to the tube assembly, the charging and discharging member is for injecting fluid through the tube assembly into the receiving lumen to press the guidewire against the inner wall of the vessel, and removing fluid from the receiving lumen through the tube assembly to release the guidewire from the inner wall of the vessel.

2. The guide catheter replacement assistance device of claim 1, wherein: the tube assembly comprises a tube member and a switch member which are connected, the tube member is connected with the fixing member and is provided with the tube cavity, and the switch member is detachably connected with the charging and discharging member and is used for selectively closing the proximal end of the tube cavity.

3. The guide catheter replacement assistance device of claim 2, wherein: the switch piece comprises a first connector, a flexible piece and a second connector, wherein a first through hole is formed in the first connector, and a step is arranged on the inner wall of the first through hole; the flexible piece is arranged in the first through hole, and a second through hole which can be communicated with the first through hole is formed in the flexible piece; the second connector is movably arranged in the first through hole, and the second connector can move to enable the flexible piece to be tightly pressed on the step, so that the second through hole is closed.

4. The guide catheter replacement assistance device of claim 3, wherein: the second connector be equipped with the third through-hole of second through-hole intercommunication, the second connector with in the first connector with the pipe connection, the second connector with in the first connector another with the piece can be dismantled and be connected.

5. The guide catheter replacement assistance device of claim 3, wherein: the second connector with first connector threaded connection or detachable joint.

6. The guide catheter replacement assistance device of claim 2, wherein: the switch piece comprises a valve body with an inner cavity and a valve core with a fourth through hole, one end of the valve body is connected with the pipe fitting, the other end of the valve body is detachably connected with the charging and discharging piece, the valve core is rotatably arranged in the valve body, and the fourth through hole is separated from or communicated with the inner cavity along with the rotation of the valve core.

7. The guide catheter replacement assistance device of claim 2, wherein: the pipe fitting is a hypotube, the hypotube is provided with the pipe cavity, a metal wire extending along the axial direction of the hypotube is arranged on the pipe wall of the hypotube, and the metal wire extends to the far end of the fixing piece.

8. The guide catheter replacement assistance device according to any one of claims 1 to 7, wherein: the fixing piece is provided with a channel which is separated from the accommodating cavity and is used for keeping the vessel in conduction; the channel is arranged in the fixing piece, or the channel is arranged on the outer wall of the fixing piece.

9. The guide catheter replacement assistance device of claim 8, wherein: when the channel is arranged on the outer wall of the fixing piece, a plurality of convex strips are arranged on the outer wall of the fixing piece, the channel is formed between every two adjacent convex strips, and the axial projection of the outer walls of the convex strips on the pipe assembly is a closed loop; or the outer wall of the fixing piece is provided with a groove, the inner space of the groove forms the channel, and the axial projection of the outer wall of the fixing piece on the pipe assembly is a closed loop.

10. The guide catheter replacement assistance device of claim 8, wherein: work as the inside of mounting is equipped with during the passageway, the mounting is including filling pipe and inflation spare, the inflation spare includes that inner tube and seal cover are located the dustcoat of inner tube periphery, the near-end of inner tube with the distal end sealing connection of pipe assembly, the distal end of inner tube is sealed, just be equipped with on the pipe wall of inner tube with the trompil of dustcoat intercommunication, fill the pipe by the distal end of inner tube penetrates the inside of inner tube and extend to wear out behind the lumen, fill the inside formation of pipe the passageway.

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