Delivery catheter and delivery system

Abstract

The invention relates to a delivery catheter and a delivery system, a first unit catheter is provided with an axially through first guide channel for guiding a first guide wire to pass through, a second unit catheter is provided with an axially through second guide channel for guiding a second guide wire to pass through, the second unit catheter is connected with the first unit catheter, and a part of catheter section of the second unit catheter exceeds the far end of the first unit catheter in the axial direction of the first unit catheter. The conveying catheter or the second guide silk thread can be exposed on the same side and the opposite side of the organism and is fixed outside the organism, the conveying catheter is kept in the original state, the first guide silk thread can accurately penetrate into a target position, and the conveying device can accurately advance towards the target position when advancing in the organism by means of the first guide silk thread. And the implantation success rate of the stent body is improved.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a delivery catheter and a delivery system. Background Art

[0002] Endovascular repair is an effective means to treat aneurysms such as the internal iliac artery, renal artery, superior mesenteric artery, celiac trunk, left subclavian artery, left common carotid artery, and innominate artery. Compared with open surgery, endovascular repair has significant advantages such as less trauma and fewer complications.

[0003] For example, when reshaping the internal iliac artery, the conventional surgical method is to introduce a guidewire from the same side approach to establish an implantation path for the internal iliac artery stent. However, when the delivery system for delivering the arterial stent reaches the bifurcation of the common iliac artery along the guidewire, the guidewire is not fixed at one end of the internal iliac artery, and the flexibility of the delivery system is usually less than that of the guidewire. Therefore, the guidewire is very easy to be lifted by the delivery system, causing the tip of the guidewire to fall out of the internal iliac artery, and the successful implantation of the arterial stent cannot be completed. Summary of the invention

[0004] Based on this, it is necessary to provide a delivery catheter and a delivery system to address the above-mentioned technical problems.

[0005] The present application provides a delivery catheter, the delivery catheter comprising:

[0006] A first unit catheter, the first unit catheter having an axially penetrating first guide channel, the first guide channel being used to guide a first guide wire to pass through;

[0007] The second unit catheter has an axially-through second guide channel for guiding the second guide wire to pass through, the second unit catheter is connected to the first unit catheter, and a portion of the second unit catheter extends beyond the distal end of the first unit catheter in the axial direction of the first unit catheter.

[0008] In one embodiment, the second unit catheter is divided into a main tube section and an extension tube section in the axial direction, and the proximal end of the extension tube section is connected to the distal end of the main tube section, wherein the main tube section is connected to the first unit catheter, and at least a portion of the extension tube section exceeds the distal end of the first unit catheter in the axial direction of the first unit catheter.

[0009] In one embodiment, the first unit conduit and the second unit conduit are constructed as an integrally formed tube structure.

[0010] In one embodiment, the length of the main body tube section is equal to the length of the first unit catheter, the proximal end of the main body tube section is flush with the proximal end of the first unit catheter, and the distal end of the main body tube section is flush with the distal end of the first unit catheter; or,

[0011] The length of the main body tube section is greater than that of the first unit catheter, the proximal end of the main body tube section is flush with the proximal end of the first unit catheter, and the distal end of the main body tube section exceeds the distal end of the first unit catheter in the axial direction of the first unit catheter.

[0012] In one embodiment, a channel cross-sectional area of ​​the first guide channel is greater than or equal to a channel cross-sectional area of ​​the second guide channel.

[0013] In one embodiment, the channel cross-sections of the first guide channel and the second guide channel are both circular, and the channel diameter of the first guide channel is greater than or equal to the channel diameter of the second guide channel.

[0014] In one of the embodiments, the first guide wire is used to establish a stent delivery path, the stent delivery path is used to guide the movement of a delivery device, and the delivery device is used to deliver the stent body.

[0015] In one embodiment, the second guide wire is used to establish a delivery adjustment path, and the delivery adjustment path is used to adjust the position of the first guide channel so that the first guide wire passing through the first guide channel passes through a target position.

[0016] In one embodiment, the delivery adjustment path is used to adjust the positions of the first unit catheter and the second unit catheter so that the distal outlet of the first guide channel is in a target area and toward the entrance of the internal iliac artery, wherein the target area includes the area between the bifurcation of the common iliac artery and the entrance of the internal iliac artery.

[0017] The present application provides a delivery system, which includes a delivery device and a delivery catheter, wherein the delivery catheter is used to deliver the delivery device.

[0018] In one embodiment, the delivery device is used to deliver a stent body, the first guide wire is used to establish a stent delivery path, and the stent delivery path is used to guide the movement of the delivery device.

[0019] In one embodiment, the second guide wire is used to establish a delivery adjustment path, and the delivery adjustment path is used to adjust the position of the first guide channel so that the first guide wire passing through the first guide channel passes through a target position.

[0020] In one embodiment, the delivery adjustment path is used to adjust the positions of the first unit catheter and the second unit catheter so that the distal outlet of the first guide channel is in a target area and toward the entrance of the internal iliac artery, wherein the target area includes the area between the bifurcation of the common iliac artery and the entrance of the internal iliac artery.

[0021] In the above-mentioned delivery catheter and delivery system, the delivery catheter or the second guide wire can be exposed on the same side and the opposite side of the biological body, and the two ends exposed on the same side and the opposite side can be fixed outside the biological body. After the delivery device penetrates the first guide channel of the delivery catheter, even if the delivery device has a large hardness, the delivery catheter can be kept in the original state, so that the distal end of the first guide channel is kept at a position and angle that allows the first guide wire to penetrate into the target position. Therefore, when the delivery device advances in the biological body with the help of the first guide wire, it can accurately advance to the target position, avoid failure of stent implantation, and improve the success rate of stent implantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the process of guidewire implantation provided in the prior art.

[0023] Figure 2 The present invention is a schematic diagram of the implantation process of the delivery device provided in the prior art.

[0024] Figure 3 A schematic diagram of the structure of a delivery catheter provided in one embodiment of the present application.

[0025] Figure 4 A schematic diagram of the use status of a delivery catheter provided in one embodiment of the present application.

[0026] Figure Number:

[0027] 10. Location of the bifurcation of the common iliac artery; 11. Location of the entrance of the internal iliac artery;

[0028] 100. target position; 200. guide wire; 300. delivery device;

[0029] 200a, preset posture; 200b, actual posture;

[0030] 1000, first unit catheter; 2000, second unit catheter;

[0031] 1100, a first guide channel; 1200, a first guide wire;

[0032] 2100, second guide channel; 2200, second guide wire;

[0033] 2000a, main pipe section; 2000b, extension pipe section. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 the present application.

[0036] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0040] In order to more clearly describe the structure of the delivery catheter and the delivery system, the term "distal end" is defined here to mean the end of the delivery catheter and the delivery system away from the operator when the operator operates the delivery catheter and the delivery system during the surgical operation, and the "proximal end" means the end of the delivery catheter and the delivery system close to the operator when the operator operates the delivery catheter and the delivery system during the surgical operation. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0041] Taking the remodeling of the internal iliac artery as an example, see Figure 1 As shown, when reshaping the internal iliac artery, the guide wire 200 can be implanted into the corresponding blood vessel in the living body to establish an implantation path for the internal iliac artery stent. Figure 2 As shown, when the guide wire 200 is used to introduce the delivery device 300, when the delivery device 300 reaches the bifurcation of the common iliac artery, the guide wire 200 is at the distal end of the internal iliac artery (i.e. Figure 2 The left end shown in FIG. 3 is not fixed, and the flexibility of the delivery device 300 is usually less than that of the guide wire 200, so the guide wire 200 is very easy to be fixed. Figure 2 The state shown in FIG. is pushed upward by the conveying device 300. Figure 2It can be seen that the actual posture 200b of the guidewire 200 is separated from the preset posture 200a of the guidewire 200, that is, the guidewire 200 deviates from the preset posture 200a due to the force, which will cause the distal end of the guidewire 200 to not be aligned with the internal iliac artery (target position 100), but to fall out of the internal iliac artery. The fall-out of the guidewire 200 is the key reason for the failure to complete the stent implantation, making the operation unable to be successfully carried out.

[0042] In view of the above-mentioned technical problems, an embodiment of the present application provides a delivery catheter. Figure 3 As shown, the delivery catheter includes a first unit catheter 1000 and a second unit catheter 2000, and the first unit catheter 1000 has a first guide channel 1100 that penetrates axially.

[0043] The first guide channel 1100 is used to guide Figure 4 The first guide wire 1200 shown in the figure moves. The function of the first guide wire 1200 is to establish a stent delivery path in the corresponding blood vessel in the organism. The first guide wire 1200 can be assembled with the adapted delivery device 300. The first guide wire 1200 is first pre-implanted in the corresponding blood vessel in the organism, and the first guide wire 1200 is used to explore a feasible path. After the stent delivery path is constructed, the stent delivery path is used to guide the movement of the delivery device 300 in the organism.

[0044] The delivery device 300 enters the body along the stent delivery path and successfully reaches the Figure 4 After reaching the target position 100 shown in the figure, the stent body can be delivered and released. The stent body can be a coated stent suitable for use in the medical field, etc. The specific structure, size and material of the stent body can be set according to actual needs and are not limited here.

[0045] Continue reading Figures 1 to 4 The second unit catheter 2000 has an axially through second guide channel 2100, the second guide channel 2100 is used to guide the second guide wire 2200 to pass through, the second guide wire 2200 is used to establish a delivery adjustment path, the delivery adjustment path is not a path for delivering the stent body or the delivery device 300, in view of Figure 1 and Figure 2 The guide wire 200 shown in the figure deviates from the actual posture 200b. The present application constructs a second guide channel 2100 through which the second guide wire 2200 can pass through by the second unit catheter 2000. Figure 4As shown, when the second guide wire 2200 passes through the same side of the biological body and continues to pass out from the opposite side, the two ends of the second guide wire 2200 can be fixed outside the biological body. After the operator applies appropriate control force to the second guide wire 2200, the actual position of the second guide wire 2200 can be adjusted. The adjusted actual position can construct a transport regulation path in the biological body.

[0046] In one embodiment, the second guide wire 2200 can apply a force to the second unit catheter 2000, and the second unit catheter 2000 can apply a force to the first unit catheter 1000. The second guide wire 2200 can adjust the actual position of the first unit catheter 1000 and the second unit catheter 2000 in the body by means of the constructed transport adjustment path. The transport adjustment path can be used to adjust the actual position of the first guide channel 1100 by controlling the actual position of the first unit catheter 1000 and the second unit catheter 2000 in the body. When the position of the first guide channel 1100 can be adjusted by the operator's control of the second guide wire 2200, the first guide wire 1200 inserted in the first guide channel 1100 can pass through the target position 100.

[0047] Specifically, the second guide wire 2200 can adjust the positions of the first unit catheter 1000 and the second unit catheter 2000 by means of the constructed delivery adjustment path, so that the distal outlet of the first guide channel 1100 is in the target area. When the distal outlet of the first guide channel 1100 is in the target area, the distal outlet of the first guide channel 1100 can accurately face the target position 100, so when the first guide wire 1200 passes through the first guide channel 1100, it can extend from the distal outlet of the first guide channel 1100 and continue to move toward the target position 100, thereby making the first guide wire 1200 passed through the first guide channel 1100 pass through the target position 100. Among them, the target area includes the area between the bifurcation position 10 of the common iliac artery and the entrance position 11 of the internal iliac artery, and the target position includes the entrance of the internal iliac artery. In addition, those skilled in the art can also select other areas and positions to be defined as the target area and target position of the operation according to actual needs, and apply them to more similar treatment scenarios, which are not limited here.

[0048] In some embodiments, the first unit conduit 1000 and the second unit conduit 2000 are connected. In some implementations, the first unit conduit 1000 and the second unit conduit 2000 are connected in parallel axially, that is, the two are arranged in parallel axially, and the relative outer peripheral surfaces of the two are connected. In some other replaceable implementations, the first unit conduit 1000 and the second unit conduit 2000 can also be connected in other forms, for example, the first unit conduit 1000 and the second unit conduit 2000 are arranged in parallel axially, but connected by other components, and for another example, the first unit conduit 1000 and the second unit conduit 2000 are arranged in parallel axially and connected to each other in the proximal region of the two. The above are only some examples of the connection methods of the first unit conduit 1000 and the second unit conduit 2000. Other connection methods that can realize the first unit conduit 1000 and the second unit conduit 2000 are all within the protection scope of this application, and this application does not make specific limitations on this.

[0049] Continue to refer Figure 3 As shown, the second unit catheter 2000 can be divided into two pipe sections in the axial direction, namely the main pipe section 2000a and the extension pipe section 2000b, wherein the proximal end of the extension pipe section 2000b is connected to the distal end of the main pipe section 2000a. The extension pipe section 2000b and the main pipe section 2000a can be two separate pipe sections, and the end-to-end connection between the extension pipe section and the main pipe section 2000a is achieved by bonding, welding, tying, etc., and after the two are connected, the extension pipe section 2000b and the main pipe section 2000a are connected through the inner cavity through the axis of each of the extension pipe section 2000b and the main pipe section 2000a, and the combination forms the second guide channel 2100. Alternatively, the extension pipe section 2000b and the main pipe section 2000a can also be an integrally formed catheter structure, but the two pipe sections are divided in the axial direction of the second unit catheter 2000. The size and material of the extension pipe section 2000b and the main pipe section 2000a may be the same or different. Those skilled in the art may construct the second unit conduit 2000 according to actual needs, which is not limited here.

[0050] See also Figure 4 As shown, the main tube segment 2000a is connected to the first unit catheter 1000, and the axial direction of the main tube segment 2000a is arranged parallel to the axial direction of the first unit catheter 1000. Therefore, when the second guide wire 2200 is implanted in the organism and a delivery adjustment path is constructed in the corresponding blood vessel in the organism, the second guide wire 2200 applies a force to the second unit catheter 2000. Based on the connection between its main tube segment 2000a and the first unit catheter 1000, the second unit catheter 2000 will also apply a force to the first unit catheter 1000, thereby adjusting the actual positions of the first unit catheter 1000 and the second unit catheter 2000 in the organism.

[0051] It should be noted that the main pipe section 2000a is connected to the first unit catheter 1000, and the manner in which the first unit catheter 1000 and the second unit catheter 2000 are connected can also be referred to. For example, in some of the implementations, the main pipe section 2000a is connected to the first unit catheter 1000 in parallel axially, that is, the two are arranged in parallel axially, and the relative outer peripheral surfaces of the two are connected. In some other replaceable implementations, the main pipe section 2000a and the first unit catheter 1000 can also be connected in other forms, for example, the main pipe section 2000a and the first unit catheter 1000 are arranged in parallel axially, but connected through other components, and for another example, the main pipe section 2000a and the first unit catheter 1000 are arranged in parallel axially, and are connected to each other in the proximal region of the two. The above are only some examples of the connection method of the main pipe section 2000a and the first unit catheter 1000. Other methods that can realize the connection between the main pipe section 2000a and the first unit catheter 1000 are within the protection scope of this application, and this application does not make specific restrictions on this.

[0052] Among them, see Figure 3 and Figure 4 As shown, at least a portion of the extension tube segment 2000b or all of the extension tube segment 2000b may extend beyond the distal end of the first unit catheter 1000 in the axial direction of the first unit catheter 1000. Because the extension tube segment 2000b extends beyond the distal end of the first unit catheter 1000, the distal end of the extension tube segment 2000b can pass through the opposite side of the biological body, and in the state of passing through, the distal end of the first unit catheter 1000 can also be maintained in the biological body. By means of adjustment of the delivery adjustment path, the distal end of the first unit catheter 1000 can be directed toward the target position 100 at a suitable angle and direction, providing a channel for the accurate advancement of the first guide wire 1200.

[0053] The function of the first unit catheter 1000 and the second unit catheter 2000 is to construct the first guide channel 1100 and the second guide channel 2100 respectively. The first guide channel 1100 needs to pass through the first guide wire 1200 to construct the stent delivery path. The second guide channel 2100 needs to pass through the second guide wire 2200 to construct the delivery adjustment path. Therefore, different paths need to be constructed between the first guide wire 1200 and the second guide wire 2200, respectively, and different functions need to be assumed. The two need to be isolated from each other and do not interfere. Therefore, the first unit catheter 1000 and the second unit catheter 2000 can belong to two catheter structures separated from each other, and the two can be connected by bonding, welding, tying, etc. For example, the first unit catheter 1000 is connected to the main pipe section 2000a of the second unit catheter 2000, and the connection method can be an interval connection at multiple points, or the first unit catheter 1000 is connected to the main pipe section 2000a of the second unit catheter 2000 along the axial direction in a linear and continuous manner. Those skilled in the art may realize the connection between the first unit catheter 1000 and the second unit catheter 2000 according to actual needs, as long as the first unit catheter 1000 and the second unit catheter 2000 are simultaneously implanted in the body, which is not limited here.

[0054] In addition, in one embodiment, the first unit conduit 1000 and the second unit conduit 2000 can also be constructed as an integrally formed tube structure. In this case, the first unit conduit 1000 and the second unit conduit 2000 are not two separate conduit structures, but two parts of the same conduit structure. One side of the conduit structure belongs to the first unit conduit 1000, and the other side belongs to the second unit conduit 2000. The conduit structure is as follows: Figure 3 The double-pipeline form shown in the figure has both the first guide channel 1100 and the second guide channel 2100 inside the catheter structure. The first guide channel 1100 and the second guide channel 2100 are substantially in a channel state parallel to each other, so that the first guide wire 1200 and the second guide wire 2200 can pass through the first guide channel 1100 and the second guide channel 2100 respectively, and the first guide wire 1200 and the second guide wire 2200 will not interfere with each other in the process of constructing the stent delivery path and the delivery adjustment path.

[0055] Those skilled in the art can construct the first guide channel 1100 and the second guide channel 2100 suitable for passing the first guide wire 1200 and the second guide wire 2200 according to actual needs. It is not limited to that some channel sections in the first guide channel 1100 and the second guide channel 2100 can be connected. As long as the first guide wire 1200 and the second guide wire 2200 do not interfere with each other in the process of constructing the stent delivery path and the delivery adjustment path, no limitation is made here.

[0056] See also Figure 3 As shown, in one embodiment, the length of the main body tube segment 2000a can be defined as being greater than or equal to the length of the first unit catheter 1000, for example, the length of the main body tube segment 2000a is equal to the length of the first unit catheter 1000, the proximal end of the main body tube segment 2000a is flush with the proximal end of the first unit catheter 1000, the distal end of the main body tube segment 2000a is flush with the distal end of the first unit catheter 1000, and the axis of the main body tube segment 2000a is parallel to the axis of the first unit catheter 1000. Alternatively, the length of the main body tube segment 2000a is greater than the length of the first unit catheter 1000, the proximal end of the main body tube segment 2000a is flush with the proximal end of the first unit catheter 1000, the distal end of the main body tube segment 2000a exceeds the distal end of the first unit catheter 1000 in the axial direction of the first unit catheter 1000, and the axis of the main body tube segment 2000a is parallel to the axis of the first unit catheter 1000.

[0057] Since the first guide channel 1100 not only needs to be penetrated by the first guide wire 1200, but also needs to be penetrated by the conveying device 300 assembled with the first guide wire 1200, and the second guide wire 2200 only needs to be penetrated by the second guide wire 2200, therefore, the channel cross-sectional area of ​​the first guide channel 1100 can be defined as being greater than or equal to the channel cross-sectional area of ​​the second guide channel 2100, and a larger channel cross-sectional area can be suitable for penetrating a conveying device 300 with a larger diameter, and those skilled in the art can set specific dimensions according to actual needs. The channel cross-sections of the first guide channel 1100 and the second guide channel 2100 are various structures such as circular, square, polygonal, etc., as long as they are suitable for penetrating the conveying device 300. In one embodiment, the channel cross-sections of the first guide channel 1100 and the second guide channel 2100 are both circular, so the channel diameter of the first guide channel 1100 can be defined as being greater than or equal to the channel diameter of the second guide channel 2100.

[0058] The present application provides a delivery system, which includes a delivery device 300 and a delivery catheter. The delivery catheter is used to deliver the delivery device 300. Specifically, the delivery device 300 and the stent body carried by the delivery device 300 can be delivered through a first guide channel 1100 in the delivery catheter.

[0059] See first Figure 1 As shown, in conventional technology, when the guide wire 200 is used to introduce the delivery device 300 during remodeling of the internal iliac artery, when the delivery device 300 reaches the bifurcation of the common iliac artery, the guide wire 200 is at the distal end of the internal iliac artery (i.e. Figure 2 The left end shown in FIG. 3 is not fixed, and the flexibility of the delivery device 300 is usually less than that of the guide wire 200, so the guide wire 200 is very easy to be fixed. Figure 2The state shown in FIG. is pushed upward by the conveying device 300. Figure 2 It can be seen that the actual posture 200b of the guidewire 200 is separated from the preset posture 200a of the guidewire 200, that is, the guidewire 200 deviates from the preset posture 200a due to the force, which will cause the distal end of the guidewire 200 to not be aligned with the internal iliac artery (target position 100), but to fall out of the internal iliac artery. The fall-out of the guidewire 200 is the key reason for the failure to complete the stent implantation, making the operation unable to be successfully carried out.

[0060] The technical solution of this application can be found in Figure 4 As shown, the delivery catheter is implanted in the body and can straddle the bifurcation of the common iliac artery. Figure 4 The second guide wire 2200 can be bent from the middle direction. Figure 4 The contralateral or ipsilateral side of the organism shown in the figure is inserted into the second guide channel 2100 of the second unit catheter 2000. Since the proximal end of the delivery catheter is outside the body on the ipsilateral side, the extension tube section 2000b of the second unit catheter 2000 is outside the body on the contralateral side. Of course, the extension tube section 2000b of the second unit catheter 2000 may not be outside the body on the contralateral side, but only the second guide wire 2200 is outside the body on the contralateral side.

[0061] Since the two ends of the delivery catheter or the second guide wire 2200 exposed on the same side and the opposite side of the biological body can be fixed outside the biological body, after the delivery device 300 penetrates the first guide channel 1100 of the delivery catheter, even if the delivery device 300 has a large hardness, the delivery catheter can be kept in its original state, so that the distal end of the first guide channel 1100 is kept at a position and angle that allows the first guide wire 1200 to penetrate into the target position 100. Therefore, when the delivery device 300 advances in the biological body with the help of the first guide wire 1200, it can accurately advance to the target position 100, avoiding the failure of the stent implantation and improving the success rate of the stent implantation.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A delivery catheter, characterized in that: The delivery catheter comprises: A first unit catheter, the first unit catheter having an axially penetrating first guide channel, the first guide channel being used to guide a first guide wire to pass through; The second unit catheter has an axially-through second guide channel for guiding the second guide wire to pass through, the second unit catheter is connected to the first unit catheter, and a portion of the second unit catheter extends beyond the distal end of the first unit catheter in the axial direction of the first unit catheter.

2. The delivery catheter according to claim 1, characterized in that: The second unit catheter is divided into a main pipe section and an extension pipe section in the axial direction, and the proximal end of the extension pipe section is connected to the distal end of the main pipe section, wherein the main pipe section is connected to the first unit catheter, and at least a portion of the extension pipe section exceeds the distal end of the first unit catheter in the axial direction of the first unit catheter.

3. The delivery catheter according to claim 1, characterized in that: The first unit conduit and the second unit conduit are constructed as an integrally formed pipe structure.

4. The delivery catheter according to claim 2, characterized in that: The length of the main body tube section is equal to the length of the first unit catheter, the proximal end of the main body tube section is flush with the proximal end of the first unit catheter, and the distal end of the main body tube section is flush with the distal end of the first unit catheter; or, The length of the main body tube section is greater than that of the first unit catheter, the proximal end of the main body tube section is flush with the proximal end of the first unit catheter, and the distal end of the main body tube section exceeds the distal end of the first unit catheter in the axial direction of the first unit catheter.

5. The delivery catheter according to claim 1, characterized in that: A channel cross-sectional area of ​​the first guide channel is greater than or equal to a channel cross-sectional area of ​​the second guide channel.

6. The delivery catheter according to claim 5, characterized in that: The channel cross sections of the first guide channel and the second guide channel are both circular, and the channel diameter of the first guide channel is greater than or equal to the channel diameter of the second guide channel.

7. The delivery catheter according to claim 1, characterized in that: The first guide wire is used to establish a stent delivery path, the stent delivery path is used to guide the movement of a delivery device, and the delivery device is used to deliver the stent body.

8. The delivery catheter according to claim 7, characterized in that: The second guide wire is used to establish a delivery adjustment path, and the delivery adjustment path is used to adjust the position of the first guide channel so that the first guide wire passing through the first guide channel passes through a target position.

9. The delivery catheter according to claim 8, characterized in that: The delivery adjustment path is used to adjust the positions of the first unit catheter and the second unit catheter so that the distal outlet of the first guide channel is in a target area and faces the entrance of the internal iliac artery, wherein the target area includes the area between the bifurcation of the common iliac artery and the entrance of the internal iliac artery.

10. A conveying system, characterized in that: The delivery system comprises a delivery device and a delivery catheter as described in any one of claims 1 to 9, wherein the delivery catheter is used to deliver the delivery device.

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