Medical catheter

Abstract

The utility model provides a kind of medical catheter, medical catheter includes joint and catheter, catheter includes main pipe section and first pipe section, one end of main pipe section is connected with joint, the other end of main pipe section is connected with first pipe section, and the included angle between the center line of main pipe section and the center line of first pipe section is alpha, wherein 120 °≤alpha < 150 °. The medical catheter of the utility model embodiment, the included angle between the center line of main pipe section and the center line of first pipe section is alpha, wherein 120 °≤alpha < 150 °, this particular angle range fully considers the anatomical features of arteriovenous fistula anastomotic mouth and the actual demand of clinical operation, can effectively adapt to the spatial structure and angle characteristics of anastomotic mouth in most cases, ensure that catheter can smoothly enter and cross anastomotic mouth, and then improve the success rate and efficiency of operation.

Description

Technical Field

[0001] This utility model relates to the field of medical catheter technology, and in particular to a medical catheter. Background Technology

[0002] Vascular access, as the lifeline for hemodialysis patients, inevitably faces various complications during long-term use, with stenosis and thrombosis being particularly prominent issues. Arteriovenous fistulas (VFs), as the primary vascular access method for hemodialysis, typically have anastomoses designed with limited space and unique angles. When performing vascular access surgeries, physicians primarily focus on addressing stenosis or thrombosis within the VF, striving to restore blood flow and ensure smooth dialysis treatment through interventional procedures. Among the surgical methods for VFs, end-to-side anastomosis has become the mainstream choice due to its unique advantages, while end-to-end and side-to-side anastomosis are used relatively less frequently. However, during end-to-side anastomosis, physicians often face a challenging problem: due to the large angle of the anastomosis itself, and the fact that the area near the anastomosis is a high-risk area for VF stenosis, guidewires and other interventional devices frequently encounter difficulties when traversing the anastomosis to reach the proximal end of the artery. This unique anatomical structure places extremely high demands on interventional devices, especially when the guidewire passes through the anastomosis to the proximal end of the artery, significantly increasing the difficulty of the procedure. This challenge not only increases the complexity and difficulty of the surgery but also prolongs the operation time, causing unnecessary pain and risks to the patient.

[0003] In related technologies, key instruments such as angiography catheters, guiding catheters, and vascular sheaths are widely used in clinical practice. However, their bending angles and design features often only adapt to a few specific types of anastomoses. Their design does not fully consider the special characteristics and clinical needs of the vascular access field, resulting in poor versatility. This makes it difficult to pass through the anastomosis smoothly in actual operation, and may even cause iatrogenic damage or surgical failure. Utility Model Content

[0004] This utility model provides a medical catheter to solve the defect of poor versatility of medical catheters in the prior art and improve the versatility of medical catheters.

[0005] An embodiment of this utility model discloses a medical catheter, comprising: Connector; The conduit includes a main pipe section and a first pipe section. One end of the main pipe section is connected to the connector, and the other end of the main pipe section is connected to the first pipe section. The angle between the centerline of the main pipe section and the centerline of the first pipe section is α, where 120°≤α<150°.

[0006] In some embodiments, the medical catheter includes a second segment, one end of which is connected to the first segment. The centerline of the second segment forms an angle β with the centerline of the first segment, wherein 80°≤β<100°. The main segment and the second segment are located on the same side of the first segment with both angles β and α. The centerlines of the main segment, the second segment, and the first segment are coplanar.

[0007] In some embodiments, the length of the first pipe segment is 0.5cm-3cm; the length of the second pipe segment is 1mm-5mm.

[0008] In some embodiments, the first pipe segment includes a first connecting end and a second connecting end, the first connecting end being connected to the main pipe segment, and the cross-sectional area of ​​the first pipe segment gradually decreasing along the direction from the first connecting end to the second connecting end.

[0009] In some embodiments, the length of the first pipe segment is 1mm-5mm.

[0010] In some embodiments, the length of the main pipe section is 30cm-50cm.

[0011] In some embodiments, the conduit is inlaid with steel wire, or the conduit is provided with a cylindrical metal mesh.

[0012] In some embodiments, the end of the conduit opposite to the connector has a smooth arc surface structure, and a metal support ring is built into the port.

[0013] In some embodiments, the outer peripheral wall of the catheter is provided with a hydrophilic coating.

[0014] In some embodiments, the connection between the main pipe section and the first pipe section is rounded.

[0015] In some embodiments, the connector includes a connecting portion, a handle portion, and a connector portion arranged sequentially along the centerline of the main pipe section. One end of the connecting portion is connected to the main pipe section. The connecting portion includes a first connecting segment and a second connecting segment connected together. One end of the first connecting segment is connected to the main pipe section. The inner diameter of the second connecting segment is larger than the inner diameter of the first connecting segment. The outer diameter of the handle portion is larger than the outer diameter of the second connecting section.

[0016] The medical catheter of this utility model has an angle α between the centerline of the main tube segment and the centerline of the first tube segment, wherein 120°≤α<150°. This specific angle range fully considers the anatomical characteristics of arteriovenous fistula anastomosis and the actual needs of clinical operation. It can effectively adapt to the spatial structure and angular characteristics of the anastomosis in most cases, ensuring that the catheter can smoothly enter and pass through the anastomosis, thereby improving the success rate and efficiency of the operation.

[0017] Therefore, the medical catheter of this utility model embodiment has the advantages of high versatility. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the 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.

[0019] Figure 1 This is a schematic diagram of an end (vein) and side (artery) anastomosis.

[0020] Figure 2 This is a schematic diagram of another type of end (vein) side (artery) anastomosis.

[0021] Figure 3 This is a schematic diagram of the existing RDC sheath.

[0022] Figure 4 This is a schematic diagram of the structure of the first embodiment (single bend) of the medical catheter provided by this utility model.

[0023] Figure 5 This is a schematic diagram of the second embodiment (double bend) of the medical catheter provided by this utility model.

[0024] Figure 6 This is a schematic diagram of the structure at the port of the medical catheter provided by this utility model.

[0025] Figures 7a-7c yes Figure 4 A schematic diagram of the working process of the medical catheter of the first embodiment provided, which anastomoses the narrowed part of the blood vessel through the end (vein) and side (artery).

[0026] Figures 8a-8c yes Figure 5 A schematic diagram of the working process of the end (vein) side (arterial) anastomosis at the vascular stenosis in the second embodiment provided.

[0027] Figure label: 101. Artery; 102. Vein; 103. Stenosis; 104. Anastomosis; 200. Guidewire; 1. Connector; 11. Connecting part; 111. First connecting section; 112. Second connecting section; 113. Guide section; 12. Handle part; 13. Joint part; 2. Conduit; 20. Main pipe section; 21. First pipe section; 211. First connecting end; 212. Second connecting end; 22. Second pipe section; 3. Port; 4. Metal support ring; Figure 3 The reference numerals in the attached diagram are: 20', main pipe section; 21', first pipe section; 22', second pipe section. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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 scope of protection of this utility model.

[0029] like Figures 4 to 8c As shown, the medical catheter of this utility model embodiment includes a connector 1 and a catheter 2. The catheter 2 includes a main tube section 20 and a first tube section 21. One end of the main tube section 20 is connected to the connector 1, and the other end of the main tube section 20 is connected to the first tube section 21. The angle between the center line of the main tube section 20 and the center line of the first tube section 21 is α, where 120°≤α<150°.

[0030] For example, for ease of description, the left-right direction is taken as the extension direction of the main section 20, and the up-down direction is perpendicular to the extension direction of the main section 20, where the left-right and up-down directions are as follows: Figure 4 As shown.

[0031] The right end of connector 1 is used to connect to other medical devices, and the left end of connector 1 is connected to the main tube section 20 of catheter 2. The internal channels of connector 1 and catheter 2 are connected to allow guidewire 200 to pass through. Connector 1 is connected to a syringe, through which contrast agent is injected into catheter 2. The contrast agent flows out from the left end of the first tube section 21, thereby confirming the diameter of the blood vessel at the left end of the medical catheter, the bifurcation angle of the lumen, etc.

[0032] The following examples illustrate this point.

[0033] Figure 1This is a schematic diagram of an anastomosis between a vein (102) and an artery (101). The end of vein 102 is directly anastomosed to the side wall of artery 101, forming an anastomosis 104 (crossing). Over time, embolic material deposits at vein 102, causing a narrowing 103 at the anastomosis 104 at the end of vein 102, thus affecting blood flow. To maintain normal blood flow, the physician needs to treat the narrowing 103 to enlarge the lumen, for example, by performing balloon dilation. Balloon dilation requires the guidewire 200 to be passed through the narrowing 103. However, directly inserting the guidewire 200 along... Figure 1 As the guidewire 200 was advanced in the direction of the arrow, it was difficult to insert into the vein 102. Therefore, the applicant designed the medical catheter of the first embodiment.

[0034] For example, using Figure 3 Although the RDC sheath is similar to the medical catheter in the second embodiment, its structure differs significantly. The first segment 21' of the RDC sheath is 15 mm long, and the second segment 22' is 14 mm long. The angle between the centerline of the main segment 20' and the centerline of the first segment 21' is α = 150°, and the angle between the centerline of the second segment 22' and the centerline of the first segment 21' is β = 100°. Due to the relatively long length of the first and second segments 21' of the RDC sheath, it is difficult to effectively access the narrow section 103 at the vein 102.

[0035] The medical catheter of the first embodiment of this utility model is described below: like Figure 4 As shown, the left end of the main pipe section 20 is provided with a first pipe section 21, and the first pipe section 21 is inclined to the lower left. The angle between the center line of the main pipe section 20 and the center line of the first pipe section 21 is α, 120°≤α<150°. For example, α is 120°, 130° or 149°. It is understood that it can also be other angles.

[0036] In the first embodiment, as Figure 4 As shown, the first pipe section 21 includes a first connecting end 211 and a second connecting end 212. The first connecting end 211 is connected to the main pipe section 20. The cross-sectional area of ​​the first pipe section 21 gradually decreases along the direction from the first connecting end 211 to the second connecting end 212.

[0037] In this first embodiment, the conduit 2 includes a main pipe section 20 and a first pipe section 21. The right end of the first pipe section 21 is a first connecting end 211, which is connected to the main pipe section 20. The left end of the first pipe section 21 is a second connecting end 212.

[0038] The cross-sectional area of ​​the first pipe segment 21 gradually decreases along the direction from the first connecting end 211 to the second connecting end 212. That is, the cross-sectional area of ​​the first pipe segment 21 gradually decreases from right to left. As a result, the first pipe segment 21 can easily reach the target location.

[0039] In the first embodiment, as Figure 4 As shown, the length of the first pipe section 21 is 1mm-5mm.

[0040] For example, the length of the first pipe section 21 is 1mm, 3mm or 5mm, etc.

[0041] Preferably, the length of the first pipe section 21 is 2mm-4mm, and more preferably, the length of the first pipe section 21 is 3mm.

[0042] The medical catheter of this embodiment has a shorter first segment 21, which is suitable for operation in the narrow space of the arteriovenous fistula anastomosis 104.

[0043] In the first embodiment, as Figure 4 As shown, the length of the main pipe section 20 is 30cm-50cm. For example, the length of the main pipe section 20 is 30cm, 40cm, or 50cm, etc.

[0044] The anastomosis site 104 of an arteriovenous fistula is confined to a small space and has specific angle requirements. In related techniques, the bending angle of catheter 2 can only accommodate a few anastomosis sites 104, resulting in poor versatility and making it unsuitable for most cases.

[0045] In this embodiment of the medical catheter, the angle between the centerline of the main tube segment 20 and the centerline of the first tube segment 21 is α, where 120°≤α<150°. This specific angle range fully considers the anatomical characteristics of the arteriovenous fistula anastomosis 104 and the actual needs of clinical operation. It can effectively adapt to the spatial structure and angular characteristics of the anastomosis 104 in most cases, ensuring that the catheter 2 can smoothly enter and pass through the anastomosis 104, thereby improving the success rate and efficiency of the operation.

[0046] Therefore, the medical catheter of this utility model embodiment has the advantages of high versatility.

[0047] Figure 2 This is a schematic diagram of another type of anastomotic vessel (vein 102) on the side (artery 101).

[0048] The end of vein 102 is directly anastomosed to the side wall of artery 101, forming an anastomosis 104 (crossing). Over time, embolic material deposits at artery 101, causing a narrowing 103 at the end of artery 101 in anastomosis 104, thus affecting blood flow. To maintain normal blood flow, the physician needs to treat the narrowing 103 to enlarge the lumen, for example, by performing balloon dilation. Balloon dilation requires the guidewire 200 to be passed through the narrowing 103. However, directly inserting the guidewire 200 along... Figure 2 As the guidewire was advanced in the direction of the arrow, it was difficult for the guidewire 200 to enter the artery 101. Therefore, the applicant designed a medical catheter according to the second embodiment.

[0049] For example, using Figure 3 Although the RDC sheath is similar to the medical catheter in the second embodiment, its structure differs significantly. The first segment 21 of the RDC sheath is 15 mm long, and the second segment 22 is 14 mm long. The angle between the centerline of the main segment 20 and the centerline of the first segment 21 is α = 150°, and the angle between the centerline of the second segment 22 and the centerline of the first segment 21 is β = 100°. Due to the relatively long length of the first and second segments 22 of the RDC sheath, it is difficult to effectively access the narrowing at the artery 101.

[0050] The medical catheter of the second embodiment of this utility model is described below: In the second embodiment, as Figure 5 As shown, the medical catheter includes a second tube segment 22, one end of which is connected to the first tube segment 21. The angle between the centerline of the second tube segment 22 and the centerline of the first tube segment 21 is β, where 80°≤β<100°, and the included angles β and α are located on the same side of the first tube segment 21.

[0051] In the second embodiment, the conduit 2 includes a main pipe section 20, a first pipe section 21, and a second pipe section 22.

[0052] The second pipe section 22 is located to the left of the first pipe section 21. One end of the second pipe section 22 is connected to the first pipe section 21, and the other end of the second pipe section 22 is inclined downward. Wherein, 80°≤β<100°, for example, β is 80°, 85°, 90° or 98°, etc.

[0053] The included angles β and α are located on the same side of the first pipe segment 21, that is, both included angles β and α are located below the first pipe segment 21. That is, the first pipe segment 21 is inclined downward relative to the main pipe segment 20, and the second pipe segment 22 is inclined downward relative to the first pipe segment 21.

[0054] The medical catheter of the second embodiment of this utility model sets the angle β between the centerline of the second tube segment 22 and the centerline of the first tube segment 21 to 80°≤β<100°. This specific angle range fully considers the anatomical characteristics of the arteriovenous fistula anastomosis 104 and the actual needs of clinical operation. It can effectively adapt to the spatial structure and angular characteristics of the anastomosis 104 in most cases, ensuring that the catheter 2 can smoothly enter and pass through the anastomosis 104, thereby improving the success rate and efficiency of the operation.

[0055] In the second embodiment, as Figure 5 As shown, the length of the first pipe section 21 is 0.5cm-3cm. The length of the second pipe section 22 is 1mm-5mm.

[0056] For example, the length of the first pipe section 21 is 0.5cm, 2cm or 3cm.

[0057] Preferably, the length of the first pipe segment 21 is 0.5cm-2cm, and more preferably, the length of the first pipe segment 21 is 1cm.

[0058] The length of the second pipe section 22 is 1mm, 3mm or 5mm, etc.

[0059] Preferably, the length of the second pipe section 22 is 2mm-4mm, and more preferably, the length of the second pipe section 22 is 3mm.

[0060] Optionally, the connection between the second pipe section 22 and the first pipe section 21 is rounded.

[0061] The medical catheter of the second embodiment of this utility model has a shorter second segment 22, which is suitable for operation in the narrow space of the arteriovenous fistula anastomosis 104.

[0062] In the second embodiment, as Figure 5 As shown, the length of the main pipe section 20 is 30cm-50cm. For example, the length of the main pipe section 20 is 30cm, 40cm, or 50cm, etc.

[0063] The medical catheters of the first embodiment and the second embodiment share the following features: In some embodiments, the catheter 2 is inlaid with a steel wire, or the catheter 2 is provided with a cylindrical metal mesh. This not only effectively improves the flexibility and pressure resistance of the catheter 2, but also provides better torque transmission during operation, preventing the catheter 2 from twisting or deforming in complex vascular environments, thereby ensuring that the catheter 2 is more stable and reliable when traversing narrow or tortuous vascular access.

[0064] In some embodiments, the outer peripheral wall of the catheter 2 is provided with a hydrophilic coating. This reduces the friction between the catheter 2 and the inner wall of the blood vessel, making the insertion and movement of the catheter 2 smoother, effectively reducing irritation and damage to the blood vessel wall, thereby reducing the risk of iatrogenic complications and ensuring that the catheter 2 can smoothly reach the target location and complete the expected medical procedure.

[0065] In other embodiments, the connection between the main tube segment 20 and the first tube segment 21 is rounded. This effectively avoids unnecessary damage or irritation to the blood vessel wall caused by excessively sharp angles at the connection point 11, while also improving the overall smoothness and flexibility of the catheter 2. This makes the catheter 2 pass through narrow or tortuous blood vessel pathways more smoothly, reducing the resistance that may be encountered during the operation, thereby improving the safety and success rate of the surgery.

[0066] In some embodiments, the port 3 at the end of the catheter away from the connector has a smooth arc surface structure, and a metal support ring 4 is built into the port 3. That is, the port 3 at the left end of the catheter has a smooth arc surface structure, and a metal support ring 4 is built into the port 3. The metal support ring 4 not only increases the mechanical properties of the port 3, but also improves the force with which the left end of the catheter holds the anastomosis 104, avoiding the situation where the medical catheter cannot hold the anastomosis 104.

[0067] In some embodiments, such as Figure 4 or Figure 5 As shown, the connector 1 includes a connecting part 11, a handle part 12 and a connector part 13 arranged sequentially along the center line of the main pipe section 20. One end of the connecting part 11 is connected to the main pipe section 20. The connecting part 11 includes a first connecting section 111 and a second connecting section 112 connected together. One end of the first connecting section 111 is connected to the main pipe section 20. The inner diameter of the second connecting section 112 is larger than the inner diameter of the first connecting section 111.

[0068] The outer diameter of the handle portion 12 is larger than the outer diameter of the second connecting section 112.

[0069] For example, the connecting part 11, the handle part 12 and the connector part 13 are arranged sequentially from left to right, and the left end of the connecting part 11 is connected to the main pipe section 20.

[0070] The first connecting segment 111 and the second connecting segment 112 are arranged sequentially from left to right, and the inner diameter of the second connecting segment 112 is larger than the inner diameter of the first connecting segment 111.

[0071] Optionally, the connecting part 11 further includes a guide section 113, which is located between the first connecting section 111 and the second connecting section 112. The inner diameter of the guide section 113 gradually decreases from right to left, thereby facilitating the guide wire 200 to enter the first connecting section 111 from the second connecting section 112 and then enter the catheter 2.

[0072] The outer diameter of the handle portion 12 is larger than the outer diameter of the second connecting section 112, so that it can be used by the operator.

[0073] The following describes the usage methods of the two medical catheters of this invention, in conjunction with vascular structures.

[0074] First, the medical catheter of the first embodiment of this utility model is introduced. When using the medical catheter of the first embodiment, the puncture is performed by inserting it from the artery 101 into the vein 102.

[0075] like Figure 1 As shown, in this situation, a narrowing 103 is commonly found near the anastomosis 104, and puncture is performed from the artery 101 into the vein 102. If the guidewire 200 enters the vein 102 from the artery 101 through the anastomosis 104, the guidewire 200 is likely to fail to pass through the anastomosis 104 and continue its passage in the artery 101.

[0076] like Figures 7a to 7c As shown, the procedure for performing surgery using the medical catheter of the first embodiment will be described below.

[0077] R1. Preoperative preparation: Disinfect and drape the surgical area, ensure aseptic treatment of the surgical area, and locate the puncture site as marked before the operation.

[0078] R2, Artery 101 puncture: Insert the puncture into Artery 101 along the distal end. After confirming blood return, quickly exchange the micro-puncture sheath to ensure the stability of the puncture channel.

[0079] R3, guidewire 200 introduction: (e.g.) Figure 7a As shown, a 0.035-inch guidewire 200 was inserted through a micro-puncture sheath and operated under ultrasound guidance to successfully reach the anastomosis 104.

[0080] R4. Adjust guidewire 200: Try repeatedly adjusting the position of guidewire 200 to allow it to enter vein 102. If you encounter difficulties, stop further operation.

[0081] R5. Insertion of a medical catheter: such as Figure 7b As shown, the guidewire 200 is inserted into the medical catheter of this application, and the medical catheter follows the guidewire 200 to the anastomosis 104 position.

[0082] R6. Confirmation by contrast: Contrast agent is delivered to anastomosis 104 through a medical catheter to confirm that the medical catheter has accurately reached the target position.

[0083] R7, Guidewire 200 Retraction and Shape Restoration: Slowly retract guidewire 200 to restore the medical catheter to its original shape.

[0084] R8. Adjust the position of the medical catheter: Adjust the position of the medical catheter so that its left end can be smoothly attached to the anastomosis site 104 of the vein 102.

[0085] R9, Guidewire 200 enters the artery 101: Push the guidewire 200 back into the medical catheter to ensure that the guidewire 200 enters the vein smoothly 102.

[0086] R10. Remove the medical catheter: After adjusting the guidewire 200, carefully remove the medical catheter.

[0087] R11, Balloon dilation: Insert a 6mm×60mm balloon along the guidewire 200° and dilate the stenotic area under a pressure of 20 atm. Repeat the operation 3 times, each lasting about 30 seconds.

[0088] R12. Examination results: Ultrasound examination confirmed that the stenotic area was significantly widened, and the fistula thrill was enhanced after dilation, indicating that blood flow was unobstructed.

[0089] R13. Postoperative cleaning: Remove the guidewire 200 and balloon together with the micro-puncture sheath. After local pressure to stop bleeding, cover the puncture site with sterile gauze.

[0090] R14. End of surgery: The surgery is complete, and the patient returns to the ward for postoperative observation.

[0091] The medical catheter of the second embodiment of the present invention is described below. When using the medical catheter of the second embodiment, the puncture is performed by inserting the catheter from the vein 102 into the artery 101.

[0092] like Figure 2 As shown, the puncture is performed from vein 102 into artery 101. Because artery 101 is located deep, direct puncture of artery 101 is difficult and causes great pain to the patient. In contrast, vein 102 has a larger diameter and is more superficially distributed, making it easier to puncture during the procedure and ensuring blood flow.

[0093] like Figures 8a to 8c As shown, the procedure for performing surgery using the medical catheter of the second embodiment will be described below.

[0094] S1. Preoperative preparation: Disinfect and drape the surgical area, ensure aseptic treatment of the surgical area, and locate the puncture site as marked before the operation.

[0095] S2, Vein 102 puncture: Insert the puncture into vein 102 against the direction of blood flow. After confirming blood return, quickly exchange the micro-puncture sheath to ensure the stability of the puncture channel.

[0096] S3, Guidewire 200 introduction: Insert the 0.035-inch guidewire 200 through the micro-puncture sheath and operate under ultrasound guidance to make the guidewire 200 reach the anastomosis 104 smoothly.

[0097] S4. Adjust guidewire 200: Try repeatedly adjusting the position of guidewire 200 to bring it into the proximal end of artery 101. If you encounter difficulties, stop further operation.

[0098] S5. Inserting a medical catheter: Insert the medical catheter of this application along the guide wire 200, and the medical catheter follows the guide wire 200 to the anastomosis 104 position.

[0099] S6. Contrast confirmation: Contrast agent is delivered to anastomosis 104 through a medical catheter to confirm that the medical catheter has accurately reached the target position.

[0100] S7. Guidewire 200 retraction and shape restoration: Slowly retract guidewire 200 to restore the medical catheter to its original shape.

[0101] S8. Adjust the position of the medical catheter: Adjust the position of the medical catheter so that its left end can be smoothly hooked onto the proximal entrance of artery 101.

[0102] S9. Guidewire 200 enters artery 101: Push guidewire 200 back into the medical catheter to ensure that guidewire 200 enters the proximal end of artery 101 smoothly.

[0103] S10. Remove the medical catheter: After completing the guidewire adjustment 200, carefully remove the medical catheter.

[0104] S11. Balloon dilation: Insert a 6mm×60mm balloon along the guidewire 200° and dilate the stenotic area under a pressure of 20 atm. Repeat the operation 3 times, each lasting about 30 seconds.

[0105] S12. Examination results: Ultrasound examination confirmed that the stenotic area was significantly widened, and the fistula thrill was enhanced after dilation, indicating that blood flow was unobstructed.

[0106] S13. Postoperative cleaning: Remove the guidewire 200 and balloon along with the micro-puncture sheath. After local pressure to stop bleeding, cover the puncture site with sterile gauze.

[0107] S14. End of surgery: The surgery is completed, and the patient returns to the ward for postoperative observation.

[0108] Similarly, regarding Figure 1 For lesions, a puncture can be performed to enter the artery 101 from the vein 102 using the medical catheter of the second embodiment, with steps similar to S1-S14.

[0109] Similarly, regarding Figure 2 For lesions, a puncture can be performed to enter the vein 102 from the artery 101 using the medical catheter of the first embodiment, with steps similar to R1-R14.

[0110] In related technologies, key instruments such as angiography catheters, guiding catheters, and vascular sheaths are widely used in clinical practice. However, their bending angles and design features often only adapt to a few specific types of anastomoses. Their design does not fully consider the special characteristics and clinical needs of the vascular access field, resulting in poor versatility. This makes it difficult to pass through the anastomosis smoothly in actual operation, and may even cause iatrogenic damage or surgical failure.

[0111] The medical catheter of this utility model has a specific angle range and length that fully consider the anatomical characteristics of the arteriovenous fistula anastomosis 104 and the actual needs of clinical operation. It can effectively adapt to the spatial structure and angle characteristics of the anastomosis 104 in most cases, ensuring that the catheter can smoothly enter and pass through the anastomosis 104, thereby improving the success rate and efficiency of the operation.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A medical catheter, characterized in that, include: Connector; The conduit includes a main pipe section and a first pipe section. One end of the main pipe section is connected to the connector, and the other end of the main pipe section is connected to the first pipe section. The angle between the centerline of the main pipe section and the centerline of the first pipe section is α, where 120°≤α<150°. The medical catheter includes a second segment, one end of which is connected to the first segment. The angle between the centerline of the second segment and the centerline of the first segment is β, where 80°≤β<100°. The main segment and the second segment are both located on the same side of the first segment, and the centerlines of the main segment, the second segment, and the first segment are coplanar. The end of the conduit opposite to the connector has a smooth arc surface structure, and a metal support ring is built into the port.

2. The medical catheter according to claim 1, characterized in that, The length of the first pipe section is 0.5cm-3cm; the length of the second pipe section is 1mm-5mm.

3. The medical catheter according to claim 1, characterized in that, The first pipe segment includes a first connecting end and a second connecting end. The first connecting end is connected to the main pipe segment, and the cross-sectional area of ​​the first pipe segment gradually decreases along the direction from the first connecting end to the second connecting end.

4. The medical catheter according to claim 3, characterized in that, The length of the first pipe section is 1mm-5mm.

5. The medical catheter according to any one of claims 1-4, characterized in that, The length of the main pipe section is 30cm-50cm.

6. The medical catheter according to any one of claims 1-4, characterized in that, The conduit is inlaid with steel wire, or the conduit is provided with a cylindrical metal wire mesh.

7. The medical catheter according to any one of claims 1-4, characterized in that, The outer peripheral wall of the catheter is provided with a hydrophilic coating.

8. The medical catheter according to any one of claims 1-4, characterized in that, The connector includes a connecting part, a handle part, and a connector part arranged sequentially along the center line of the main pipe section. One end of the connecting part is connected to the main pipe section. The connecting part includes a first connecting segment and a second connecting segment connected together. One end of the first connecting segment is connected to the main pipe section. The inner diameter of the second connecting segment is larger than the inner diameter of the first connecting segment. The outer diameter of the handle portion is larger than the outer diameter of the second connecting section.

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