Dilation device and guidance system

Abstract

The application relates to a dilating device and a guiding system. The dilating device comprises a dilating tube, a connecting tube and an adapter, wherein the dilating tube comprises a supporting tube and an expansion tube sleeved outside the supporting tube, a filling cavity is formed in the expansion tube, the expansion tube has a contraction state and an expansion state of expanding in the radial direction after the filling cavity is filled with a medium, the connecting tube is connected with the dilating tube, the connecting tube is provided with a filling channel, the filling channel is communicated with the filling cavity, and the adapter is provided with a filling opening communicated with the filling channel. The dilating device can expand the curved blood vessel with plaques and ulcers or the spastic blood vessel with tightness, reduce the resistance of the blood vessel wall, and ensure that a surgical instrument such as a guiding catheter or a contrast catheter smoothly passes through the curved or spastic position of the blood vessel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a dilating device and a guiding system. BACKGROUND

[0002] Percutaneous coronary intervention (PCI) is mainly used for the treatment of obstructive coronary artery disease, which has developed rapidly due to its advantages of minimally invasive, time-saving, safe and efficient. In addition, PCI has a high success rate and good effect for left main lesion, chronic total occlusion (CTO) lesion, severe calcified lesion, etc. At present, the radial artery approach for PCI has become the preferred approach. During the operation, interventional instruments such as guide wires, balloons or stents need to be delivered to the lesion site, but due to the tortuosity of the blood vessel path and the effect of blood flow dynamics, flexible guide wires, balloons or stents are difficult to pass through the blood vessel to reach the lesion site. Therefore, a guide catheter needs to be inserted into the blood vessel to guide the interventional instrument to the lesion site.

[0003] However, when the radial artery is tortuous or spastic, the guide catheter will not pass through the artery smoothly, and violent operation may cause blood vessel injury, local pain or local hematoma, and even serious complications such as osteofascial syndrome. However, if the contralateral radial artery or femoral artery approach is changed, it will increase the patient's pain, the probability of serious complications and the high cost of the operation, and also increase the operation time and the time of exposure to radiation for the patient and the operator. SUMMARY

[0004] Therefore, it is necessary to provide a dilating device and a guiding system for the problem that the guide catheter is difficult to pass through the blood vessel when the artery is tortuous or spastic.

[0005] In one aspect, the present application provides a dilating device, comprising:

[0006] a dilating tube, the dilating tube comprising a support tube and an expansion tube sleeved outside the support tube, the expansion tube being formed with a filling cavity inside, the expansion tube having a contracted state and an expanded state expanded radially after the filling cavity is filled with a medium;

[0007] a connecting tube connected with the dilating tube, the connecting tube being provided with a filling channel, the filling channel being in communication with the filling cavity;

[0008] an adapter provided with a filling port in communication with the filling channel.

[0009] The technical solutions of the present application are further described as follows:

[0010] In one embodiment, the outer diameter of the dilating tube gradually decreases in the direction away from the connecting tube.

[0011] In one embodiment, the dilation device is provided with a guide wire channel, which penetrates through the dilation tube, the connecting tube and the connector.

[0012] In one embodiment, the outer periphery of the dilation tube is provided with a drainage hole, which communicates with the guide wire channel.

[0013] In one embodiment, the outer periphery of the dilation tube, the outer periphery of the connecting tube and the inner wall of the guide wire channel are provided with a lubricating coating.

[0014] In one embodiment, the outer periphery of the connecting tube is provided with threads; and / or,

[0015] The outer periphery of the connecting tube is provided with an annular protrusion, and the outer diameter of the annular protrusion gradually increases in the direction from the dilation tube to the connector; and / or,

[0016] The outer periphery of the connecting tube is provided with a net structure; and / or,

[0017] The outer periphery of the connecting tube is provided with a drug hole, which carries a drug.

[0018] In one embodiment, the connecting tube comprises an inner tube and an outer tube sleeved outside the inner tube, the inner tube and the outer tube form the filling channel, one end of the inner tube is connected with the support tube, the other end of the inner tube is connected with the connector, one end of the outer tube is connected with the inflation tube, the other end of the outer tube is connected with the connector.

[0019] In one embodiment, the connecting tube comprises an inner tube and an outer tube sleeved outside the inner tube, the inner tube and the outer tube form the filling channel, the inner tube is connected with the support tube, the outer tube is connected with the inflation tube, one end of the filling channel away from the dilation tube is provided with a connecting hole, the dilation device further comprises a push tube, one end of the push tube penetrates into the connecting hole and enters into the filling channel, the other end of the push tube communicates with the filling port.

[0020] In one embodiment, the material of the inflation tube is a biocompatible polymer material; the material of the support tube is a biocompatible metal material.

[0021] On the other hand, the application also provides a guide system, which comprises a guide catheter and the above-mentioned dilation device, the dilation device penetrates into the guide catheter, and the dilation tube penetrates out of one end of the guide catheter, and the connector penetrates out of the other end of the guide catheter.

[0022] On the other hand, the application also provides a guide system, which comprises:

[0023] The expansion tube comprises a support tube and an expansion tube sleeved outside the support tube, the expansion tube is formed with a filling cavity, and the expansion tube has a contracted state and an expanded state after being radially expanded after the filling cavity is filled with a medium;

[0024] The connecting tube is connected with the expansion tube, the connecting tube is provided with a filling channel, the filling channel is communicated with the filling cavity, the connecting tube comprises a soft section, a bending section and a support section connected in sequence, the soft section is connected with the expansion tube, and the bending section is formed with at least one bending structure bent relative to the support section or the soft section; and

[0025] The adapter is connected with the support section, and the adapter is provided with a filling port communicated with the filling channel;

[0026] The expansion tube, the connecting tube and the adapter are formed with a device channel for a surgical instrument to pass through.

[0027] The expansion device and the guiding system can effectively increase the support strength of the expansion tube, so that the expansion tube can smoothly penetrate into a tortuous or spastic position of a blood vessel, and the expansion tube is configured to have a contracted state and an expanded state, so that after the expansion tube penetrates into the tortuous or spastic position of the blood vessel, a liquid or a gas or other medium is injected into the filling cavity of the expansion tube through the filling port of the adapter and the filling channel of the connecting tube, so that the expansion tube is radially expanded, thereby expanding the tortuous blood vessel with plaques or ulcers or the spastic blood vessel with gripping, reducing the resistance of the blood vessel wall, and ensuring that a guiding catheter or a contrast catheter or other surgical instrument smoothly penetrates into the tortuous or spastic position of the blood vessel. When the blood vessel is tortuous or spastic during an interventional operation, the guiding catheter or other surgical instrument can be ensured to smoothly penetrate into the lesion position without changing the access path, the operation is simple, the operation time is saved, and the time of exposure of the patient and the operator to the rays is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings, and their description, are presented to explain the application and are not intended to limit the application unduly.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative effort.

[0030] Figure 1 Structure diagram of the expansion device of the first embodiment;

[0031] Figure 2 Structure diagram of the expansion tube of the expansion device shown in Figure 1 Structure diagram of the expansion tube and the connecting tube of the expansion device shown in

[0032] Figure 3 Structure diagram of the expansion tube of the expansion device shown in Figure 1 Structure diagram of the expansion tube of the expansion device shown in

[0033] Figure 4 Structure diagram of the thread of the connecting tube of the embodiment;

[0034] Figure 5 Structure diagram of the annular protrusion of the connecting tube of the embodiment;

[0035] Figure 6 Structure diagram of the net structure of the connecting tube of the embodiment;

[0036] Figure 7 Structure diagram of the medicine hole of the connecting tube of the embodiment;

[0037] Figure 8 Structure diagram of the expansion device of the second embodiment;

[0038] Figure 9 Structure diagram of the expansion tube, the connecting tube and the pushing tube of the expansion device shown in Figure 8 Structure diagram of the expansion tube, the connecting tube and the pushing tube of the expansion device shown in

[0039] Figure 10 Structure diagram of the connecting tube of the expansion device shown in Figure 8 Structure diagram of the connecting tube of the expansion device shown in

[0040] Figure 11 Structure diagram of the guide catheter of the embodiment.

[0041] Explanation of reference numerals:

[0042] 10, dilating device; 11, dilating tube; 111, supporting tube; 112, inflatable tube; 113, inflation cavity; 114, drainage hole; 12, connecting tube; 121, inner tube; 122, outer tube; 123, inflation passage; 124, thread; 125, annular protrusion; 126, net structure; 127, medicine hole; 13, adapter; 131, inflation port; 14, guide wire passage; 20, dilating device; 21, dilating tube; 213, inflation cavity; 22, connecting tube; 221, inner tube; 222, outer tube; 223, inflation passage; 2231, connecting hole; 23, adapter; 231, inflation port; 24, pushing tube; 30, guide catheter; 31, dilating tube; 32, connecting tube; 321, soft section; 322, bending section; 323, supporting section; 33, adapter; 331, inflation port. DETAILED DESCRIPTION

[0043] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar improvements can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0044] Specifically, the present application provides a dilating device for dilating a blood vessel to assist a guide catheter or the like surgical instrument to pass through the blood vessel. Specifically, the dilating device of an embodiment includes a dilating tube, a connecting tube and an adapter, wherein the dilating tube includes a supporting tube and an inflatable tube sleeved outside the supporting tube, the inflatable tube is formed with an inflation cavity therein, the inflatable tube has a contracted state and an expanded state along the radial direction after the inflation cavity is filled with a medium, the connecting tube is connected with the dilating tube, the connecting tube is provided with an inflation passage, the inflation passage is in communication with the inflation cavity, and the adapter is provided with an inflation port in communication with the inflation passage.

[0045] Specifically, the dilating device described above can be used in combination with a guide catheter or a contrast catheter when the guide catheter or the contrast catheter cannot continue to penetrate into the blood vessel due to the tortuosity or spasm of the blood vessel. The dilating device described above can be penetrated into the guide catheter, and the dilating tube can be penetrated out of the guide catheter or the contrast catheter and into the tortuous or spastic part of the blood vessel. The adapter can be used to connect a syringe, and then the syringe can inject a liquid or a gas or the like medium into the inflation cavity of the dilating tube through the inflation port of the adapter. After the inflation cavity is filled with the medium, the dilating tube can be expanded along the radial direction, thereby supporting the tortuous or spastic part of the blood vessel, expanding the inner diameter of the blood vessel to ensure that the guide catheter or the contrast catheter or the like surgical instrument can smoothly pass through the tortuous or spastic part of the blood vessel and penetrate into the lesion part. Then, the dilating device can be withdrawn from the guide catheter or the contrast catheter, and the surgical instrument can be delivered to the lesion part through the guide catheter or the contrast catheter.

[0046] The expansion device can effectively increase the supporting strength of the expansion tube, so that the expansion tube can smoothly pass into the tortuous or spastic position of the blood vessel, and by configuring the expansion tube to have a contracted state and an expanded state, after the expansion tube passes into the tortuous or spastic position of the blood vessel, a medium such as liquid or gas is injected into the inflation cavity of the expansion tube through the inflation channel of the connecting tube via the inflation port of the adapter, so that the expansion tube expands radially, thereby expanding the tortuous blood vessel with plaques or ulcers or the spastic blood vessel with gripping, reducing the resistance of the blood vessel wall, and ensuring that the surgical instrument such as the guide catheter or the contrast catheter smoothly passes through the tortuous or spastic position of the blood vessel. When encountering the problem of blood vessel tortuosity or spasticity during interventional surgery, the surgical instrument such as the guide catheter can be smoothly passed into the lesion position without changing the access path, the operation is simple, the surgery time is saved, and the time of exposure of the patient and the operator to the rays is reduced.

[0047] The different embodiments of the expansion device of the present application will be further described below in conjunction with the drawings.

[0048] Specifically, referring to Figure 1 and Figure 2 , Figure 1 and Figure 2 a structural schematic diagram of the expansion device 10 of the first embodiment is shown, specifically, the expansion device 10 of the first embodiment includes an expansion tube 11, a connecting tube 12 and an adapter 13, wherein the expansion tube 11 includes a supporting tube 111 and an expansion tube 112 sleeved outside the supporting tube 111, the expansion tube 112 forms an inflation cavity 113 therein, the expansion tube 112 has a contracted state and an expanded state which expands radially after the inflation cavity 113 is filled with a medium, one end of the connecting tube 12 is connected with the expansion tube 11, the connecting tube 12 is provided with an inflation channel 123 which communicates with the inflation cavity 113, the other end of the connecting tube 12 is connected with the adapter 13, and the adapter 13 is provided with an inflation port 131 which communicates with the inflation channel.

[0049] Further, in the present embodiment, the material of the expansion tube 112 is a biocompatible polymer material, for example, a composite material mixed with one or more of polyethylene, polypropylene, polytetrafluoroethylene, polyurethane, polyamide, polyether block polyamide, polyester, and silicone rubber. The expansion tube 112 can be formed by injection molding, extrusion, pressing, calendering or thermoplastic shaping process. Preferably, in the present embodiment, the expansion tube 112 is a double-layer tube material, including an inner layer covering the outer circumferential surface of the supporting tube 111 and an outer layer sleeved outside the inner layer, and the inflation cavity 113 is formed between the inner layer and the outer layer. In another embodiment, the expansion tube 112 can also be a single-layer tube material, and the inflation cavity 113 is formed between the expansion tube 112 and the supporting tube 111.

[0050] Further, in the present embodiment, the material of the support tube 111 is a biocompatible metal material, such as a composite material mixed with one or more of titanium, magnesium, nickel, cobalt, stainless steel, and the like. Preferably, the structure of the support tube 111 is a braided mesh tube structure, thereby effectively improving the support rigidity of the expansion tube 11, so as to ensure that the expansion tube 11 can be inserted into the support tube 111 to support the soft inflation tube 112.

[0051] Referring to Figure 3 , the outer diameter of the expansion tube 11 gradually decreases in the direction away from the connected tube 12, i.e., the expansion tube 11 as a whole is tapered, thereby improving the expansion performance of the expansion tube 11, ensuring that the expansion tube 11 can be smoothly inserted into the relatively narrow and tortuous or spastic position of the blood vessel without damaging the blood vessel, and at the same time, combining the performance of the expansion tube 11 to be inflated, thereby effectively expanding the blood vessel.

[0052] Further, the expansion device 10 is provided with a guide wire channel 14, which penetrates the expansion tube 11, the connected tube 12, and the connecting piece. Specifically, in use, a guide wire can be inserted into the guide wire channel 14 of the expansion device 10, so that the guide wire can be delivered to the designated area along the expansion device 10. The guide wire includes but is not limited to a guide guide wire, a contrast guide wire, a rotary grinding guide wire, and the like.

[0053] Further, the outer periphery of the expansion tube 11 is provided with a drainage hole 114, which is in communication with the guide wire channel 14. Thus, after the expansion device 10 is sent to the lesion site, the blood flow of the branch blood vessel can flow through the drainage hole 114 and the guide wire channel 14, ensuring the blood flow of the branch blood vessel. Further, the drainage hole 114 is separated from the inflation cavity 113, thereby avoiding the blood from entering the inflation cavity 113, and also avoiding the leakage of the medium in the inflation cavity 113 into the blood vessel.

[0054] Further, the outer periphery of the expansion tube 11 and the outer periphery of the connected tube 12 are provided with a lubricating coating, thereby reducing the friction between the blood vessel wall and the expansion device 10, improving the smoothness of the expansion device 10 when inserted into the blood vessel, and avoiding damage to the blood vessel. Further, the inner wall of the guide wire channel 14 is also provided with a lubricating coating, thereby improving the smoothness when the guide wire is inserted. Preferably, the lubricating coating can be selected from a hydrophilic coating, such as polyvinylpyrrolidone, or a hydrophobic coating, such as silicone oil, polytetrafluoroethylene, and the like.

[0055] Further, referring to Figure 2In the embodiment, the connecting tube 12 comprises an inner tube 121 and an outer tube 122 sleeved outside the inner tube 121, a filling channel 123 is formed between the inner tube 121 and the outer tube 122, one end of the inner tube 121 is connected with the support tube 111, the other end of the inner tube 121 is connected with the adapter 13, one end of the outer tube 122 is connected with the expansion tube 112, and the other end of the outer tube 122 is connected with the adapter 13. That is, in the embodiment, the connecting tube 12 has a double-layer structure, and the expansion tube 11 and the connecting piece are connected through the double-layer connecting tube 12, thereby improving the supportability and the twist-controllability of the expansion device 10.

[0056] Specifically, the material of the outer tube 122 is a biocompatible polymer material, for example, a composite material mixed with one or more of polyethylene, polypropylene, polytetrafluoroethylene, polyurethane, polyamide, polyether block polyamide, polyester, and silicone rubber. Further, the material hardness of the outer tube 122 is greater than the material hardness of the expansion tube 112, so as to ensure that the outer tube 122 of the connecting tube 12 will not be deformed when the expansion tube 112 is filled with the medium.

[0057] The material of the inner tube 121 is a biocompatible metal material, for example, a composite material mixed with one or more of titanium, magnesium, nickel, cobalt, and stainless steel. Preferably, the inner tube 121 and the support tube 111 are integrally formed, that is, the structure of the inner tube 121 is also a woven mesh tube structure, thereby effectively improving the supportability and the twist-controllability of the connecting tube 12.

[0058] Further, the outer periphery of the outer tube 122 of the connecting tube 12 can be provided with some texture structure, thereby improving the functionality of the connecting tube 12. Specifically, referring to Figure 4 In an embodiment, the outer periphery of the connecting tube 12 is provided with a thread 124, so that when the expansion device 10 passes through the tortuous and spastic blood vessel, the connecting tube 12 is rotated by the rotating connecting piece. Since the outer periphery of the connecting tube 12 is provided with the thread 124, the blood vessel wall and the thread 124 can exert an axial force on the expansion device 10, thereby helping the expansion device 10 to pass through the tortuous and spastic blood vessel, and further improving the pushability, the passability, and the twist-controllability of the expansion device 10.

[0059] Referring to Figure 5The outer circumferential side of the connecting tube 12 can also be provided with an annular protrusion 125, and the outer diameter of the annular protrusion 125 gradually increases in the direction from the expanding tube 11 to the adapter 13, that is, the annular protrusion 125 has a tapered structure, and the outer diameter of the end of the annular protrusion 125 close to the expanding tube 11 is smaller, so that it is easier to penetrate into the tortuous and spastic part of the blood vessel. The outer diameter of the end of the annular protrusion 125 close to the expanding tube 11 is larger, so that the connecting tube 12 has a certain expansion, and when the connecting tube 12 passes through the tortuous and spastic blood vessel, it can further expand the blood vessel, thereby improving the expansion of the expanding device 10. Preferably, the outer circumferential side of the connecting tube 12 is provided with a plurality of annular protrusions 125, and the plurality of annular protrusions 125 are arranged in the axial direction of the connecting tube 12.

[0060] Referring to Figure 6 The outer circumferential side of the connecting tube 12 can also be provided with a mesh structure 126, and preferably the mesh structure 126 can be a metal mesh, which can improve the rigidity of the connecting tube 12, thereby improving the supporting performance of the supporting tube 111 to improve the steering performance.

[0061] Referring to Figure 7 The outer circumferential side of the connecting tube 12 can also be provided with a drug hole 127, and the drug hole 127 is used to carry drugs, wherein the drugs include but are not limited to drugs for treating vascular spasm, so that the blood vessel can be expanded while treating vascular spasm. Preferably, the drug hole 127 is provided with a plurality of drug holes 127, and the plurality of drug holes 127 are distributed at intervals on the outer circumferential side of the connecting tube 12.

[0062] Referring to Figures 8 to 10 , Figures 8 to 10 The structure of the expanding device 20 of the second embodiment is shown in the structural schematic view, and specifically, the expanding device 20 of the second embodiment further includes a pushing tube 24 for connecting the connecting tube 22 and the adapter 23. Specifically, in the second embodiment, the connecting tube 22 includes an inner tube 221 and an outer tube 222 sleeved outside the inner tube 221, and a filling channel 223 is formed between the inner tube 221 and the outer tube 222. The inner tube 221 is connected with the supporting tube, and the outer tube 222 is connected with the expanding tube. The end of the filling channel 223 away from the expanding tube 21 is provided with a connecting hole 2231 in communication with the filling channel 223, and the rest of the end of the filling channel 223 away from the expanding tube 21 is a closed structure. One end of the pushing tube 24 is arranged in the connecting hole 2231 and penetrates into the filling channel 223, and the other end of the pushing tube 24 is in communication with the filling port 231.

[0063] Specifically, the push tube 24 is a hollow tubular structure with two open ends, the diameter of the push tube 24 is smaller than the radial dimension of the filling channel 223, so as to ensure that one end of the push tube 24 penetrates into the filling channel 223 to communicate the filling channel 223 and the filling port 231 through the push tube 24, and when the liquid or gas medium is injected into the filling port 231, the medium can enter the filling cavity 213 and make the expansion tube 21 enter the expanded state to expand the blood vessel. Moreover, since the tube diameter of the push tube 24 is small, it occupies a small space in the blood vessel, so as not to affect the passage of other surgical instruments through the blood vessel, and is beneficial to the delivery of other interventional instruments.

[0064] Further, the material of the push tube 24 is a biocompatible metal material, for example, a composite material mixed with one or more of titanium, magnesium, nickel, cobalt, stainless steel, etc., so as to improve the support and torque control of the push tube 24. Further, the cross section of the push rod can be circular, oval or rectangular, etc., which is not limited here.

[0065] It can be understood that the other technical features of the expansion tube 21, the connecting tube 22 and the adapter 23 of the second embodiment can be the same as those of the first embodiment without contradiction in the combination of technical features, which will not be repeated here.

[0066] The present application also provides a guide system, specifically, a guide system of an embodiment includes a guide catheter and the expansion device of any of the above embodiments, the expansion device is arranged in the guide catheter, and the expansion tube penetrates out of one end of the guide catheter, and the adapter penetrates out of the other end of the guide catheter.

[0067] Specifically, in use, the guide catheter can be first penetrated into the blood vessel, when the guide catheter encounters a tortuous or spastic problem of the blood vessel and cannot continue to penetrate into the blood vessel, the expansion device can be penetrated into the guide catheter, and the expansion tube penetrates out of the distal end of the guide catheter, and the adapter remains in the proximal end of the guide catheter and is used to connect the syringe, then the gas or liquid medium is injected into the filling port of the adapter through the syringe, the medium can enter the filling cavity of the expansion tube through the filling channel, so that the expansion tube is radially expanded and supports the tortuous or spastic part of the blood vessel, so that the inner diameter of the blood vessel is expanded, at this time, the guide catheter can smoothly pass through the tortuous or spastic position of the blood vessel and penetrate into the lesion position, then the expansion device is withdrawn from the guide catheter, and the surgical instrument can be delivered to the lesion position through the guide catheter or the angiographic catheter.

[0068] The foregoing expansion device generally needs to be used with the guide catheter, so as to realize the functions of expanding the blood vessel and delivering the instrument. In another embodiment, a guide system 30 is provided, which has the functions of expanding the blood vessel and guiding the instrument, specifically, referring to Figure 11The guiding system 30 of one embodiment comprises an expansion tube 31, a connecting tube 32 and an adapter 33. The expansion tube 31 comprises a support tube and an expansion tube sleeved outside the support tube, and a filling cavity is formed in the expansion tube. The expansion tube has a contracted state and an expanded state after being filled with a medium in the filling cavity. One end of the connecting tube 32 is connected with the expansion tube 31, and the connecting tube 32 is provided with a filling channel which is in communication with the filling cavity. The other end of the connecting tube 32 is connected with the adapter 33, and the adapter 33 is provided with a filling port 331 which is in communication with the filling channel.

[0069] Further, in the embodiment, the connecting tube 32 comprises a soft section 321, a bending section 322 and a support section 323 connected in sequence. The soft section 321 is connected with the expansion tube 31. The bending section 322 is formed with at least one bending structure which is bent relative to the support section 323 or the soft section 321. The bending angle of the bending structure can be adjusted according to the physiological structure of the patient (such as the opening position and the inclination angle of the coronary artery) and the operation path (such as left coronary or right coronary), so that the connecting tube 32 can be smoothly hung on the coronary artery opening after entering the aorta.

[0070] Further, the guiding system 30 is provided with an instrument channel which penetrates through the expansion tube 31, the connecting tube 32 and the adapter 33, so that the operation instruments such as guide wire, balloon and stent can be delivered to the lesion position through the instrument channel.

[0071] It can be understood that, in the absence of contradictions in the combination of technical features, the other technical features of the expansion tube 31, the connecting tube 32 and the adapter 33 of the guiding system 30 of the embodiment can be the same as those of the expansion tube 31, the connecting tube 32 and the adapter 33 of the expansion device of the first embodiment, and will not be described here.

[0072] The guiding system 30 described above is provided at one end of the connecting tube 32. The expansion tube 31 is configured to comprise a support tube and an expansion tube sleeved outside the support tube. The support tube can effectively increase the support strength of the expansion tube 31, so that the expansion tube 31 can be smoothly inserted into the tortuous or spastic position of the blood vessel. The expansion tube is configured to have a contracted state and an expanded state. After the expansion tube 31 is inserted into the tortuous or spastic position of the blood vessel, a medium such as liquid or gas is injected into the filling cavity of the expansion tube 31 through the filling port 331 of the adapter 33 and the filling channel of the connecting tube 32, so that the expansion tube is radially expanded, thereby expanding the tortuous blood vessel with plaque or ulcer or the spastic blood vessel with tightness, reducing the resistance of the blood vessel wall, ensuring that the guiding system 30 smoothly passes through the tortuous or spastic position of the blood vessel and enters the lesion position. At the same time, the instrument channel is provided in the guiding system 30, so that the guiding system 30 can assist the instruments such as guide wire, balloon and stent to smoothly pass through the tortuous or spastic position of the blood vessel and reach the lesion position.

[0073] Any technical features in the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure encompasses all possible combinations.

[0074] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that, for those skilled in the art, without departing from the concept of the present disclosure, some modifications and improvements can be made, which are all within the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

[0075] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0076] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0077] In the present disclosure, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0078] In the present application, unless explicitly stated and limited otherwise, a first feature "on", "above", or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above", and "on top of" a second feature can be directly above or diagonally above the second feature, or simply mean that the first feature is horizontally higher than the second feature. A first feature "under", "below", and "underneath" a second feature can be directly below or diagonally below the second feature, or simply mean that the first feature is horizontally lower than the second feature.

[0079] It is to be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Other than in the operating examples or where otherwise indicated, as used herein, the terms "comprising", "comprises" and "comprised of" are to be construed as meaning "including, but not limited to".

Claims

1. An expansion device, characterized in that, include: An expansion tube, comprising a support tube and an expansion tube sleeved outside the support tube, wherein a filling cavity is formed inside the expansion tube, and the expansion tube has a contracted state and an expanded state in which it expands radially after the filling cavity is filled with a medium. A connecting tube, which is connected to the expansion tube, the connecting tube having a filling channel communicating with the filling cavity, and the outer diameter of the expansion tube gradually decreasing in the direction away from the connecting tube; and... An adapter, wherein the adapter is provided with a filling port that communicates with the filling channel; The expansion device is provided with a guide wire channel, which passes through the expansion tube, the connecting tube, and the adapter.

2. The expansion device according to claim 1, characterized in that, The expansion tube has a drainage hole on its outer periphery, and the drainage hole is connected to the guide wire channel.

3. The expansion device according to claim 1, characterized in that, The outer periphery of the expansion tube, the outer periphery of the connecting tube, and the inner wall of the guide wire channel are all provided with a lubricating coating.

4. The expansion device according to claim 1, characterized in that, The outer circumferential side of the connecting pipe is threaded; and / or, The outer periphery of the connecting pipe is provided with an annular protrusion, and the outer diameter of the annular protrusion gradually increases along the direction from the expansion pipe to the adapter; and / or, The outer periphery of the connecting pipe is provided with a mesh structure; and / or, The outer periphery of the connecting tube is provided with a drug port, which is used to carry the drug.

5. The expansion device according to any one of claims 1-4, characterized in that, The connecting pipe includes an inner pipe and an outer pipe sleeved outside the inner pipe. The filling channel is formed between the inner pipe and the outer pipe. One end of the inner pipe is connected to the support pipe, and the other end of the inner pipe is connected to the adapter. One end of the outer pipe is connected to the expansion pipe, and the other end of the outer pipe is connected to the adapter.

6. The expansion device according to any one of claims 1-4, characterized in that, The connecting tube includes an inner tube and an outer tube sleeved outside the inner tube. The inner tube and the outer tube form the filling channel. The inner tube is connected to the support tube, and the outer tube is connected to the expansion tube. The end of the filling channel away from the expansion tube is provided with a connecting hole. The expansion device also includes a pushing tube. One end of the pushing tube passes through the connecting hole and into the filling channel, and the other end of the pushing tube is connected to the filling port.

7. The expansion device according to any one of claims 1-4, characterized in that, The expansion tube is made of a biocompatible polymer material; the support tube is made of a biocompatible metallic material.

8. A guidance system, characterized in that, The device includes a guiding catheter and an expansion device according to any one of claims 1-7, the expansion device being inserted through the guiding catheter, and the expansion tube extending through one end of the guiding catheter, and the adapter extending through the other end of the guiding catheter.

9. A guidance system, characterized in that, include: An expansion tube, comprising a support tube and an expansion tube sleeved outside the support tube, wherein a filling cavity is formed inside the expansion tube, and the expansion tube has a contracted state and an expanded state in which it expands radially after the filling cavity is filled with a medium. A connecting tube, which is connected to the expansion tube, is provided with a filling channel communicating with the filling cavity. The connecting tube includes a flexible section, a bent section, and a support section connected in sequence. The flexible section is connected to the expansion tube. The bent section forms at least one bent structure relative to the support section or the flexible section. The outer diameter of the expansion tube gradually decreases in the direction away from the connecting tube. An adapter is provided, which is connected to the support section and has a filling port that communicates with the filling channel. The expansion tube, the connecting tube, and the adapter all have instrument channels formed within them for the passage of surgical instruments.

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