Angiography catheter and guiding device

Abstract

This utility model relates to the field of medical device technology and discloses an angiography catheter and a guiding device. The angiography catheter includes a distal structure, a proximal structure, and a transition structure. By incorporating the transition structure, a cross-section is made perpendicular to the length of the transition structure. The width of the first tapering section gradually increases from one end to the other, and the guiding catheter is fitted onto the outside of the proximal structure between the other end of the first tapering section and the proximal structure. When the angiography catheter guides the guiding catheter through locations with small, tortuous, or spasmodic blood vessels, the first tapering section gradually widens the tortuous or spasmodic areas, allowing the guiding catheter to pass smoothly without damaging the blood vessel. Therefore, the angiography catheter can perform both angiography and guiding procedures without the need for additional instruments, saving time, reducing surgical costs, and lowering the probability of surgical complications.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to angiography catheters and guiding devices. Background Technology

[0002] Percutaneous coronary intervention (PCI) is primarily used to treat obstructive coronary artery disease. Its rapid development due to its minimally invasive, time-saving, safe, and highly effective advantages has made it an important treatment method for obstructive coronary artery disease. Furthermore, PCI demonstrates high success rates and good efficacy for diseases such as left main coronary artery disease, chronic total occlusion, and severe calcification.

[0003] Currently, the radial artery approach has become the preferred vascular route for PCI. During the procedure, the placement of the guiding catheter is the first step in coronary intervention and a key factor in its success. The guiding catheter's main functions are to deliver interventional devices and monitor coronary artery pressure.

[0004] Specifically, a 0.035-inch guidewire is first inserted through an arterial sheath into the pathway vessel until its tip reaches the ascending aorta. The guiding catheter then travels along the vascular pathway to the ascending aorta under the guidance of the guidewire. During this process, if the pathway vessel is small, spasmodic, or tortuous, the flexible tip of the guiding catheter can deform and become sharp, creating a "plough furrow effect." This means the guiding catheter not only fails to reach the ascending aorta smoothly but the sharp tip can also damage or even rupture the pathway vessel, potentially leading to complications such as compartment syndrome and vascular occlusion.

[0005] When a guiding catheter encounters narrow, spasmodic, or tortuous blood vessels along its path, the following methods are commonly used to resolve the issue:

[0006] 1. Changing the surgical approach: This method increases the scope of surgical trauma, the likelihood of vascular complications, and the cost of surgical treatment. Furthermore, the changed surgical approach may also result in a "plough furrow effect."

[0007] 2. Twisting and pushing: The guide catheter is gently twisted left and right along the angiography guidewire. This method has a low success rate and is prone to aggravating the degree of vascular damage and patient pain, increasing the chance of radial artery occlusion, and causing damage to the vascular intima and vagal nerve reflex.

[0008] 3. Requires additional instruments: This involves the use of a balloon catheter and a 0.014-inch guidewire. Specifically, after the guidewire passes through the vascular pathway, a guiding catheter containing an auxiliary balloon catheter is guided through areas where the blood vessels are small, spasmodic, or tortuous. Then, a 0.035-inch angiographic guidewire is used to guide the guiding catheter to the ascending aorta. This procedure is complex, and the auxiliary instruments not only increase surgical costs but also extend the balloon catheter dilation time, leading to a prolonged surgical time and increased surgical risks. Utility Model Content

[0009] In view of this, the present invention provides an angiography catheter and guiding device to solve the problem that in existing percutaneous coronary interventions, it is necessary to change the approach of the guiding catheter, or to push the guiding catheter by twisting, or to guide it with an additional guide wire and balloon catheter, which not only increases the cost and time of the operation, but also causes vascular complications of the interventional procedure.

[0010] In a first aspect, this utility model provides an angiography catheter, comprising:

[0011] A remote structure, wherein a first channel is provided within the remote structure, and one end of the first channel is used to communicate with the outside world;

[0012] A proximal structure is provided at an interval from the distal structure, and a second channel is provided within the proximal structure, one end of which is used to communicate with the outside.

[0013] A transition structure connects the distal structure and the proximal structure. The transition structure includes a first gradient section, one end of which is connected to the distal structure. A third channel is provided within the first gradient section, one end of which communicates with the other end of the first channel. The third channel has a cross-section perpendicular to the length of the transition structure. The width of the first gradient section gradually increases from one end to the other. The outer side between the other end of the first gradient section and the proximal structure is used to accommodate a guiding catheter. The first gradient section is used to guide the movement of the guiding catheter.

[0014] Beneficial Effects: By setting a transition structure and making a cross-section perpendicular to the length of the transition structure, the width of the first gradient segment gradually increases from one end to the other, and the guiding catheter is fitted onto the outside between the other end of the first gradient segment and the proximal structure. When the angiography catheter guides the guiding catheter through locations with small, tortuous, or spasmodic blood vessels, the first gradient segment can gradually deform the small, tortuous, or spasmodic parts of the blood vessel, while avoiding deformation of the guiding catheter tip and the "ploughing effect," allowing the guiding catheter to pass smoothly through the location without damaging the blood vessel. Based on this, the angiography catheter can perform both angiography and guiding operations, without the need for other operations in related techniques, i.e., no need to change the surgical path, no need for twisting and pushing, and no need for the assistance of other instruments. It can pass through locations with small, tortuous, or spasmodic blood vessels using only the angiography catheter, which not only saves time and reduces surgical costs, but also achieves the technical effect of reducing the probability of surgical complications.

[0015] In one optional embodiment, the transition structure includes a second gradient segment, one end of which is connected to the proximal structure. The second gradient segment has a fourth channel, one end of which is connected to the other end of the second channel, and the other end of which is connected to the other end of the third channel. The second gradient segment has a cross-section perpendicular to the length of the transition structure, and the width of the second gradient segment gradually increases from one end to the other end.

[0016] Beneficial effects: By incorporating a second gradient segment, the smoothness of the dimensional transition between the proximal and transitional structures can be increased. During angiography, the catheter can avoid abrupt dimensional changes between the proximal and transitional structures that could damage the blood vessel, thus enhancing the protection of the vessel.

[0017] In one optional embodiment, the transition structure includes a connecting segment connecting the first gradient segment and the second gradient segment. The connecting segment has a fifth channel communicating between the third channel and the fourth channel, and has a cross-section perpendicular to the length direction of the transition structure. The width of the connecting segment remains constant, and the outer side of the connecting segment is used to sleeve the guiding conduit.

[0018] Beneficial effects: By setting a connecting segment that connects the first and second gradient segments, specifically along the length direction perpendicular to the transition structure, the connecting segment connects to the maximum width of both the first and second gradient segments. The maximum width of the first gradient segment equals the width of the connecting segment, which in turn equals the maximum width of the second gradient segment. Therefore, when the guiding catheter needs to be fitted at the maximum widths of both the first and second gradient segments, it is fitted onto the connecting segment. This increases the connection area between the guiding catheter and the connecting segment, thereby improving the stability of the connection position between the guiding catheter and the angiography catheter.

[0019] In one alternative implementation, at the connection point between the first gradient segment and the connecting segment, the first gradient segment and the connecting segment have the same size;

[0020] And / or, at the connection between the second gradient segment and the connecting segment, the second gradient segment and the connecting segment have the same size;

[0021] And / or, a cross-section is made along the length direction perpendicular to the transition structure, and the first gradient segment and the second gradient segment are trapezoidal in shape.

[0022] Beneficial effects: By limiting the connection between the first gradient segment and the connecting segment to have the same size, and the connection between the second gradient segment and the connecting segment to have the same size, the smoothness of the connection between the transition structure and the first gradient segment, as well as the connection between the transition structure and the second gradient segment, can be increased. This avoids the possibility of scratching the blood vessel due to size differences between the connection between the transition structure and the first gradient segment, as well as the connection between the transition structure and the second gradient segment, thereby achieving the technical effect of improving the protection of blood vessels.

[0023] Compared to making a cross-section along the length direction perpendicular to the transition structure, the upper and lower sides of the first and second gradient sections are arc-shaped. By limiting the cross-section to the length direction perpendicular to the transition structure, the shapes of the first and second gradient sections are trapezoidal, which makes the shape processing of the first and second gradient sections simpler and can achieve the technical effect of improving the ease of fabrication of angiography catheters.

[0024] In one alternative implementation, the first gradient segment is fixedly connected to the distal structure, and / or the second gradient segment is fixedly connected to the proximal structure.

[0025] Beneficial effects: By defining the fixed connection between the first gradient segment and the distal structure, and between the second gradient segment and the proximal structure, the technical effect of improving the stability of the connection between the first gradient segment and the distal structure, and between the second gradient segment and the proximal structure, can be achieved.

[0026] In one alternative implementation, the first gradient segment and the distal structure, and / or the second gradient segment and the proximal structure, are an integrated structure.

[0027] Beneficial effects: By defining the first gradient segment and the distal structure, and the second gradient segment and the proximal structure as an integrated structure, the technical effect of improving the stability and reliability of the connection between the first gradient segment and the distal structure, and between the second gradient segment and the proximal structure, can be further achieved.

[0028] In one alternative embodiment, the inner wall of the first channel, and / or the inner wall of the second channel, and / or the inner wall of the third channel, and / or the inner wall of the fourth channel, and / or the inner wall of the fifth channel is provided with a first lubricating coating.

[0029] Beneficial effects: The first lubricating coating can increase the lubrication inside the contrast catheter. When the contrast catheter is used for contrast operation, contrast fluid needs to be injected into the contrast catheter. At this time, the first lubricating coating can reduce the flow resistance of the contrast fluid, thereby achieving the technical effect of improving the flow speed and flow efficiency of the contrast fluid.

[0030] In one alternative embodiment, a second lubricating coating is provided on the outer side of the distal structure, and / or the outer side of the proximal structure, and / or the outer side of the transition structure.

[0031] Beneficial effects: The second lubricating coating can reduce the friction of the angiography catheter entering the blood vessel, thereby improving the smoothness of the catheter's entry into the blood vessel and avoiding damage to the blood vessel, thus achieving the technical effect of enhancing the protection of the blood vessel.

[0032] Secondly, this utility model also provides a guiding device, comprising:

[0033] The angiography catheter described above;

[0034] A guiding catheter is fitted at the position between the other end of the first gradient section and the proximal structure.

[0035] Beneficial effects: When the guiding catheter is placed between the other end of the first tapering segment and the proximal structure, that is, when the guiding catheter is placed on the connecting segment or the second tapering segment, the first tapering segment guides the movement path of the guiding catheter, allowing the guiding catheter to gradually and without damaging blood vessels through small, tortuous or spasmodic blood vessels, thereby achieving the technical effect of improving the ease of guiding catheter passage through small, tortuous or spasmodic blood vessels.

[0036] In one alternative embodiment, the guiding catheter is provided with a sixth channel, the inner wall of which is fitted to the outer wall of the transition structure.

[0037] Beneficial effects: By limiting the sixth channel to fit snugly against the outer wall of the transition structure, that is, by tightly fitting the sixth channel onto the outer wall of the transition structure, the technical effect of improving the stability of the connection between the guiding catheter and the transition structure can be achieved. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the angiography catheter in this embodiment;

[0040] Figure 2 This is a schematic diagram of the guiding device in this embodiment.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Distal structures; 2. Proximal structures;

[0043] 3. Transition structure; 301. First transition section; 302. Second transition section; 303. Connecting section;

[0044] 4. Guiding catheter. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, in one aspect, an angiography catheter is provided, the angiography catheter comprising:

[0048] The remote structure 1 has a first channel inside it, one end of which is used to communicate with the outside world;

[0049] The proximal structure 2 is spaced apart from the distal structure 1. The proximal structure 2 has a second channel, one end of which is used to communicate with the outside.

[0050] The transition structure 3 connects the distal structure 1 and the proximal structure 2. The transition structure 3 includes a first gradient section 301. One end of the first gradient section 301 is connected to the distal structure 1. A third channel is provided in the first gradient section 301. One end of the third channel is connected to the other end of the first channel and has a cross section perpendicular to the length of the transition structure 3. The width of the first gradient section 301 gradually increases from one end to the other end. The outer side between the other end of the first gradient section 301 and the proximal structure 2 is used to fit the guiding catheter 4. The first gradient section 301 is used to guide the movement of the guiding catheter 4.

[0051] In the angiography catheter of this embodiment, by setting a transition structure 3, a cross-section is made along the length direction perpendicular to the transition structure 3. The width of the first gradient section 301, which is connected to the distal structure 1, gradually increases from one end to the other end. The guiding catheter 4 is sleeved on the outside between the other end of the first gradient section 301 and the proximal structure 2. In this way, when the angiography catheter drives the guiding catheter 4 through the location of small, tortuous, or spasmodic blood vessels, the first gradient section 301 can gradually deform the small, tortuous, or spasmodic parts of the blood vessels, while avoiding deformation of the tip of the guiding catheter 4 and the occurrence of the "ploughing effect". This allows the guiding catheter 4 to pass through the location smoothly without damaging the blood vessels. Based on this, the angiography catheter can perform angiography through the first, second, and third channels. After the angiography is completed, the angiography catheter can also guide the guiding catheter 4 without the need for other operations in the related technology, that is, without changing the surgical path, without twisting and pushing, and without the need for the assistance of other instruments. The angiography catheter alone can pass through the small, tortuous, or spasmodic blood vessels, which not only saves time and reduces surgical costs, but also reduces the probability of surgical complications.

[0052] In this embodiment, the angiography catheter can be used in percutaneous coronary intervention to perform surgical treatment without changing the interventional route, while also reducing radial artery pathway-related complications.

[0053] Of course, in other embodiments, the angiography catheter can be used in other procedures as needed.

[0054] In addition, one end of the first gradient segment 301 is... Figure 1 The left end of the first gradient segment 301 shown, and the other end of the first gradient segment 301 is... Figure 1 The right end of the first gradient segment 301 shown. The length direction of the transition structure 3 refers to along... Figure 1 The horizontal direction shown is then the length direction perpendicular to the transition structure 3. Figure 1 The vertical direction is shown.

[0055] In this embodiment, a cross-section is taken along the length direction perpendicular to the transition structure 3. The width dimensions of both the distal structure 1 and the proximal structure 2 remain unchanged. Here, the width dimension is... Figure 1 The vertical dimension. Of course, in other embodiments, depending on the design of the angiography catheter, the cross-section is made along the length direction perpendicular to the transition structure 3, and the width dimensions of the distal structure 1 and the proximal structure 2 are gradually changed, all of which are within the protection scope of this utility model.

[0056] Furthermore, in this embodiment, the distal end refers to the end of the angiography catheter and the guiding catheter 4 located in the patient's body and away from the doctor during the operation, while the proximal end refers to the end of the angiography catheter and the guiding catheter 4 close to the doctor during the operation.

[0057] In addition, combined Figure 1 As shown, the transition structure 3 includes a second gradient segment 302. One end of the second gradient segment 302, i.e., the right end of the second gradient segment 302, is connected to the proximal structure 2. A fourth channel is provided within the second gradient segment 302. One end of the fourth channel is connected to the other end of the second channel, and the other end of the fourth channel is connected to the other end of the third channel. A cross-section is made along the length direction perpendicular to the transition structure 3, and the width of the second gradient segment 302 gradually increases from one end to the other. The other end of the second gradient segment 302 is the left end of the second gradient segment 302.

[0058] Of course, in other embodiments, depending on the design of the angiography catheter, the transition structure 3 may not include the second gradient segment 302. Compared to other embodiments, this embodiment, by providing the second gradient segment 302, can increase the smoothness of the dimensional transition between the proximal structure 2 and the transition structure 3, without requiring any modification to the original proximal structure 2 of the angiography catheter. During angiography, the abrupt change in size between the proximal structure 2 and the transition structure 3 can be avoided, thus preventing damage to the blood vessel and achieving the technical effect of improving the protection of the blood vessel.

[0059] In addition, in this embodiment, the transition structure 3 includes a connecting section 303, which is connected between the first transition section 301 and the second transition section 302. The connecting section 303 has a fifth channel, which is connected between the third channel and the fourth channel. The fifth channel has a cross section along the length direction perpendicular to the transition structure 3. The width of the connecting section 303 remains unchanged. The outer side of the connecting section 303 is used to fit the guiding conduit 4.

[0060] By providing a connecting segment 303, which connects the first gradient segment 301 and the second gradient segment 302, specifically along the length direction perpendicular to the transition structure 3, the connecting segment 303 connects to the maximum width of the first gradient segment 301 and simultaneously to the maximum width of the second gradient segment 302. The maximum width of the first gradient segment 301 is equal to the width of the connecting segment 303, which in turn equals the maximum width of the second gradient segment 302. Therefore, when the guiding catheter 4 needs to be fitted onto the maximum width of the first gradient segment 301 and the maximum width of the second gradient segment 302, the guiding catheter 4 is fitted onto the connecting segment 303. This increases the connection area between the guiding catheter 4 and the connecting segment 303, thereby improving the stability of the connection position between the guiding catheter 4 and the angiography catheter.

[0061] Alternatively, the transition structure 3 may not include the connecting segment 303.

[0062] In addition, in this embodiment, at the connection between the first gradient segment 301 and the connecting segment 303, the first gradient segment 301 and the connecting segment 303 have the same size;

[0063] At the connection between the second gradient section 302 and the connecting section 303, the second gradient section 302 and the connecting section 303 have the same size.

[0064] In other embodiments, depending on the design of the angiography catheter, the dimensions of the transition structure 3 and the first gradient segment 301 may differ at the connection point. Similarly, the dimensions of the transition structure 3 and the second gradient segment 302 may differ at the connection point. Compared to other embodiments, this embodiment increases the smoothness of the connections between the transition structure 3 and the first gradient segment 301, and between the transition structure 3 and the second gradient segment 302, avoiding the potential for scratches to the blood vessel caused by dimensional differences at these connections, thereby enhancing the protection of the blood vessel.

[0065] Furthermore, in this embodiment, a cross-section is made along the length direction perpendicular to the transition structure 3, i.e. Figure 1 The cross section shown has a trapezoidal shape for the first gradient segment 301 and the second gradient segment 302.

[0066] Of course, in other embodiments, depending on the design of the angiography catheter, the shape of the first gradient segment 301 and the second gradient segment 302 can be adjusted by making a cross-section along the length direction perpendicular to the transition structure 3. For example, the upper and lower edges of the first gradient segment 301 and the second gradient segment 302 can be arc-shaped. Compared with other embodiments, the shape processing of the first gradient segment 301 and the second gradient segment 302 in this embodiment is simpler, which can achieve the technical effect of improving the ease of fabrication of the angiography catheter.

[0067] In other embodiments, depending on the design of the angiography catheter, it may be limited only to the connection between the transition structure 3 and the first gradient section 301, where the transition structure 3 and the first gradient section 301 have the same dimensions; or it may be limited only to the connection between the transition structure 3 and the second gradient section 302, where the transition structure 3 and the second gradient section 302 have the same dimensions; or it may be limited only to a cross-section perpendicular to the length direction of the transition structure 3, where the first gradient section 301 and the second gradient section 302 are trapezoidal in shape.

[0068] Furthermore, in this embodiment, the first gradient segment 301 is fixedly connected to the distal structure 1, and the second gradient segment 302 is fixedly connected to the proximal structure 2. Based on this, the technical effect of improving the stability of the connection between the first gradient segment 301 and the distal structure 1, and between the second gradient segment 302 and the proximal structure 2, can be achieved.

[0069] Preferably, the first gradient segment 301 and the distal structure 1, and the second gradient segment 302 and the proximal structure 2 are integrated structures. Based on this, the technical effect of improving the stability and reliability of the connection between the first gradient segment 301 and the distal structure 1, and between the second gradient segment 302 and the proximal structure 2 can be further achieved.

[0070] Of course, in other embodiments, the fixed connection may be limited only to the first gradient segment 301 and the distal structure 1, or only to the second gradient segment 302 and the proximal structure 2. Simultaneously, the fixed connection may be limited only to the first gradient segment 301 and the distal structure 1 being an integrated structure, or only to the second gradient segment 302 and the proximal structure 2 being an integrated structure.

[0071] In other embodiments, the distal structure 1 and the first transition section 301, and the proximal structure 2 and the second transition section 302, are detachably connected to facilitate the replacement of the transition structure 3, the distal structure 1, and the proximal structure 2 as needed. Specifically, the distal structure 1 and the first transition section 301, and the proximal structure 2 and the second transition section 302, are detachably connected by threads. Of course, the detachable connection method between the distal structure 1 and the first transition section 301, and between the distal structure 1 and the second transition section 302, can be adjusted according to different designs of the angiography catheter.

[0072] Furthermore, in this embodiment, the inner walls of the first channel, the second channel, the third channel, the fourth channel, and the fifth channel are all provided with a first lubricating coating. The first lubricating coating can increase the lubrication inside the contrast catheter. When the contrast catheter performs contrast operation, contrast fluid needs to be injected into the contrast catheter. At this time, the first lubricating coating can reduce the flow resistance of the contrast fluid, thereby achieving the technical effect of improving the flow speed and flow efficiency of the contrast fluid.

[0073] Furthermore, a second lubricating coating is provided on the outer side of the distal structure 1, the outer side of the proximal structure 2, and the outer side of the transition structure 3. The outer side is the side of the angiography catheter that can contact the blood vessel. The second lubricating coating reduces the frictional force of the angiography catheter entering the blood vessel, thereby improving the smoothness of the catheter's entry and preventing damage to the blood vessel, thus achieving the technical effect of enhancing the protection of the blood vessel.

[0074] In this embodiment, the first and second lubricating coatings can be of the same type, both being polytetrafluoroethylene (PTFE) coatings. However, in other embodiments, the types of the first and second lubricating coatings can differ depending on the design of the angiography catheter. Furthermore, in other embodiments, the types of the first and second lubricating coatings can be adjusted; for example, both the first and second lubricating coatings can be polyvinylpyrrolidone (PVP) coatings.

[0075] As an alternative implementation, the inner walls of the first channel, the second channel, the third channel, the fourth channel, and the fifth channel may not be provided with or may not be provided with the first lubricating coating. At the same time, the outer side of the distal structure 1, the outer side of the proximal structure 2, and the outer side of the transition structure 3 may not be provided with or may not be provided with the second lubricating coating.

[0076] According to an embodiment of the present invention, in another aspect, a guiding device is also provided, comprising:

[0077] The contrast catheter in this embodiment;

[0078] The guiding catheter 4 is positioned between the other end of the first transition section 301 and the proximal structure 2.

[0079] When the guiding catheter 4 is positioned between the other end of the first transition section 301 and the proximal structure 2, that is, when the guiding catheter 4 is positioned on the connecting section 303 or the second transition section 302, the first transition section 301 guides the movement path of the guiding catheter 4, enabling the guiding catheter 4 to gradually and without damaging the blood vessels through the tortuous or spasmodic locations of the blood vessels, thereby achieving the technical effect of improving the ease of guiding catheter 4 passing through the small, tortuous or spasmodic locations of the blood vessels.

[0080] Meanwhile, if guiding catheter 4 fails to pass smoothly through the radial artery, it indicates potential damage to the vessel. In related techniques, because the guidewires of guiding catheter 4 and balloon catheters are not interchangeable, both need to be placed outside the patient's body to replace the balloon catheter's guidewire. However, vessel damage can lead to collapse and depression, preventing the balloon catheter's guidewire from being inserted, thus hindering the procedure and impacting the patient's health. In contrast, because the guidewire of guiding catheter 4 can be the same as that of the angiography catheter, guidewire replacement is unnecessary, preventing vessel collapse and allowing the percutaneous coronary intervention to continue, thereby reducing surgical risks.

[0081] Furthermore, the guiding catheter 4 is provided with a sixth channel, the inner wall of which is fitted against the outer wall of the transition structure 3, i.e., the outer wall of the connecting section 303 or the outer wall of the second transition section 302. By limiting the fit between the sixth channel and the outer wall of the transition structure 3, that is, by ensuring that the sixth channel is tightly fitted against the outer wall of the transition structure 3, the technical effect of improving the stability of the connection between the guiding catheter 4 and the transition structure 3 can be achieved.

[0082] Of course, in other embodiments, the dimensions between the sixth channel and the transition structure 3 can be adjusted depending on the design of the guiding device.

[0083] Furthermore, a third lubricating coating is provided within the sixth channel. This reduces the frictional force required for other structures to enter the sixth channel, thereby simplifying the process for these structures to access the sixth channel.

[0084] Specifically, the third lubricating coating is a polytetrafluoroethylene coating. As an alternative embodiment, the third lubricating coating may also be a polyvinylpyrrolidone coating.

[0085] Of course, in other embodiments, a third lubricating coating may be provided locally within the sixth channel; that is, the third lubricating coating is not provided at the connection position between the sixth channel and the transition structure 3, while the third lubricating coating is provided at the position where the sixth channel and the transition structure 3 are not connected. As an alternative implementation, the sixth channel may not have a third lubricating coating provided.

[0086] Specifically, the following are application examples of the guidance device in this embodiment:

[0087] Case 1

[0088] The patient is a 59-year-old woman with unstable angina, coronary atherosclerotic heart disease, grade 3 hypertension (very high risk), type 2 diabetes, hypercholesterolemia, and old cerebral infarction.

[0089] Using the angiography catheter of this embodiment, coronary angiography was performed via the radial artery approach. The findings showed: TIMI (Thrombolysis In Myocardial Infarction) grade II flow in the mid-segment of the left anterior descending artery with a maximum stenosis of 99%; occlusion of the distal circumflex artery with TIMI flow grade 0; and occlusion of the mid-segment of the right coronary artery with TIMI flow grade 0. The patient and family refused bypass surgery, and the plan was to open the chronically occluded lesion of the right coronary artery.

[0090] The specific procedure is as follows: A 0.035-inch diameter J-shaped guidewire is inserted into the aortic sinus and then shaped into a U-shaped guidewire. The guiding catheter 4 is then guided along the guidewire to the vicinity of the radial artery where it merges with the brachial artery. During this process, significant resistance was observed in the movement of the guiding catheter 4. At this point, the guiding catheter 4 can be withdrawn and placed on top of the angiography catheter, with a 5cm gap between the distal ends of the angiography catheter and the distal ends of the guiding catheter 4. The entire procedure, including the angiography catheter and the guiding catheter 4, is then inserted into the patient's body, successfully navigating the high-resistance segment of the peripheral arteries and reaching the ascending aorta.

[0091] Furthermore, after fixing the J-shaped guidewire, the angiography catheter was removed, and then the percutaneous coronary intervention was successfully completed through the guiding catheter 4.

[0092] After the percutaneous coronary intervention (PCI) procedure was successfully completed, the guiding catheter 4 was removed smoothly. Routine pressure bandaging was applied to the puncture site. There was no swelling or significant pain in the forearm. At discharge, the patient had no swelling or significant pain in the forearm.

[0093] Case 2

[0094] The patient is a 40-year-old male who has acute non-ST-segment elevation myocardial infarction, clinical grade I heart failure due to acute myocardial infarction, coronary atherosclerotic heart disease, and hypercholesterolemia.

[0095] Using the angiography catheter of this embodiment, coronary angiography was performed via the radial artery approach. The findings showed: 99% stenosis in the proximal-mid segment of the left anterior descending artery (LAD), TIMI flow grade III; 95% stenosis at the ostium of the first diagonal branch, TIMI flow grade III; and 50% stenosis at the ostium of the circumflex artery, TIMI flow grade III. Treatment of the lesions in the LAD and first diagonal branches is planned.

[0096] The percutaneous coronary intervention procedure is as follows: A J-shaped guidewire with a diameter of 0.035 inches is used to guide the catheter 4 to the vicinity of the elbow joint where resistance is encountered. Radial arteriography is performed, which shows that the radial artery is tortuous.

[0097] At this point, guide catheter 4 is withdrawn and placed on the angiography catheter, with the distal end of the angiography catheter and the distal end of guide catheter 4 10cm apart. The angiography catheter and guide catheter 4 are then inserted into the patient's body as a whole, successfully passing through the elbow joint resistance segment to reach the ascending aorta.

[0098] Further, after fixing the J-wire, the angiography catheter was removed, and then the left coronary ostium was reached through the guiding catheter 4, and the percutaneous coronary intervention was successfully completed.

[0099] After the percutaneous coronary intervention (PCI) procedure was successfully completed, the guiding catheter 4 was removed smoothly. Routine pressure bandaging was applied to the puncture site. There was no swelling or significant pain in the forearm. At discharge, the patient had no swelling or significant pain in the forearm.

[0100] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A contrast catheter, characterized in that, include: The remote structure (1) has a first channel, one end of which is used to communicate with the outside world; The proximal structure (2) is spaced apart from the distal structure (1), and the proximal structure (2) is provided with a second channel, one end of which is used to communicate with the outside. A transition structure (3) is connected between the distal structure (1) and the proximal structure (2). The transition structure (3) includes a first gradient section (301). One end of the first gradient section (301) is connected to the distal structure (1). A third channel is provided in the first gradient section (301). One end of the third channel is connected to the other end of the first channel and has a cross section perpendicular to the length of the transition structure (3). The width of the first gradient section (301) gradually increases from one end to the other end. The outer side between the other end of the first gradient section (301) and the proximal structure (2) is used to fit a guiding catheter (4). The first gradient section (301) is used to guide the movement of the guiding catheter (4).

2. The angiography catheter according to claim 1, characterized in that, The transition structure (3) includes a second gradient section (302), one end of which is connected to the proximal structure (2). A fourth channel is provided in the second gradient section (302), one end of which is connected to the other end of the second channel, and the other end of which is connected to the other end of the third channel. The second gradient section (302) has a cross section perpendicular to the length of the transition structure (3), and the width of the second gradient section (302) gradually increases from one end to the other end.

3. The angiography catheter according to claim 2, characterized in that, The transition structure (3) includes a connecting section (303), which is connected between the first gradient section (301) and the second gradient section (302). The connecting section (303) has a fifth channel, which is connected between the third channel and the fourth channel, and has a cross-section perpendicular to the length of the transition structure (3). The width of the connecting section (303) remains unchanged, and the outer side of the connecting section (303) is used to fit the guiding conduit (4).

4. The angiography catheter according to claim 3, characterized in that, At the connection between the first gradient segment (301) and the connecting segment (303), the first gradient segment (301) and the connecting segment (303) have the same size; And / or, at the connection between the second gradient segment (302) and the connecting segment (303), the second gradient segment (302) and the connecting segment (303) have the same size; And / or, a cross section is made along the length direction perpendicular to the transition structure (3), and the first gradient segment (301) and the second gradient segment (302) are trapezoidal in shape.

5. The angiography catheter according to claim 3, characterized in that, The first gradient segment (301) is fixedly connected to the distal structure (1), and / or the second gradient segment (302) is fixedly connected to the proximal structure (2).

6. The angiography catheter according to claim 5, characterized in that, The first gradient segment (301) and the distal structure (1), and / or the second gradient segment (302) and the proximal structure (2) are an integrated structure.

7. The angiography catheter according to any one of claims 3-6, characterized in that, The inner wall of the first channel, and / or the inner wall of the second channel, and / or the inner wall of the third channel, and / or the inner wall of the fourth channel, and / or the inner wall of the fifth channel is provided with a first lubricating coating.

8. The angiography catheter according to any one of claims 1-6, characterized in that, A second lubricating coating is provided on the outer side of the distal structure (1), and / or the outer side of the proximal structure (2), and / or the outer side of the transition structure (3).

9. A guiding device, characterized in that, include: The angiography catheter according to any one of claims 1-8; A guiding catheter (4) is fitted at the position between the other end of the first gradient section (301) and the proximal structure (2).

10. The guiding device according to claim 9, characterized in that, The guiding catheter (4) is provided with a sixth channel, and the inner wall of the sixth channel is fitted to the outer wall of the transition structure (3).

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