A perfusion catheter

Abstract

The application provides a perfusion catheter, and relates to the technical field of medical devices. The perfusion catheter can improve the uniformity of liquid flowing out of a plurality of perfusion holes on a catheter tube body, and is beneficial to the purpose of uniform perfusion. The perfusion catheter comprises a catheter tube body; wherein the catheter tube body comprises a delivery section and a perfusion section, the proximal end of the delivery section can be connected with a syringe, the perfusion section is located on the distal end side of the delivery section, the perfusion section is enclosed to form a perfusion cavity, the pipe wall of the perfusion section has at least two perfusion holes in communication with the perfusion cavity, the delivery section is enclosed to form a delivery channel, and along the radial direction of the catheter tube body, the inner diameter of the perfusion cavity is greater than the inner diameter of the delivery channel.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an infusion catheter. Background Technology

[0002] An infusion catheter is a medical device used to inject medications or other fluids into the body during surgery or treatment. An infusion catheter typically consists of a long, thin catheter and a syringe, through which medications are delivered into the body. In related technologies, uneven drug delivery can occur as the medication flows out from multiple infusion orifices on the catheter, thus affecting the therapeutic effect. Utility Model Content

[0003] This application provides an infusion conduit that can improve the uniformity of liquid flow from multiple infusion holes on the conduit body, which is beneficial to achieving the purpose of uniform infusion.

[0004] The infusion catheter provided in this application includes: a catheter body; wherein the catheter body includes a delivery section and an infusion section, the proximal end of the delivery section can be connected to an injection device, the infusion section is located on the distal side of the delivery section, the infusion section encloses to form an infusion cavity, the wall of the infusion section has at least two infusion holes communicating with the infusion cavity, the delivery section encloses to form a delivery channel, and along the radial direction of the catheter body, the inner diameter of the infusion cavity is larger than the inner diameter of the delivery channel.

[0005] The infusion catheter provided in this application, by configuring the catheter body into a structure including a delivery section and an infusion section, can deliver liquids such as drugs to the vicinity of the infusion part of the human body through the delivery channel formed by the delivery section. Furthermore, multiple infusion holes are provided on the wall of the infusion section, allowing liquid flowing into the infusion chamber to be infused into the infusion part from multiple points through these holes, which is beneficial for improving the infusion efficiency of drugs, etc. Simultaneously, setting the inner diameter of the infusion chamber to be larger than the inner diameter of the delivery channel allows the infusion chamber to have a larger space than a delivery channel of the same length. This results in a more uniform pressure in different parts of the liquid within the infusion chamber after the drug or other liquid flows into it, thus ensuring that the pressure of the liquid near each infusion hole is consistent or nearly consistent, which in turn helps to ensure that the flow rate of liquid flowing out from each infusion hole is consistent or nearly consistent. Therefore, the infusion catheter provided in this application embodiment can improve the uniformity of liquid flow from multiple infusion holes on the catheter body, which is beneficial for achieving uniform infusion.

[0006] In one possible implementation of this application, the infusion cavity has a spindle-shaped structure.

[0007] In one possible implementation of this application, the infusion port includes an end port and at least two side ports, the end port penetrating the distal end of the infusion section wall along the axial direction of the catheter body, and each side port penetrating the wall of the infusion section radially.

[0008] In one possible implementation of this application, the diameter of the end hole is smaller than the inner diameter of the injection cavity.

[0009] In one possible implementation of this application, at least two side holes are axially distributed in the injection section, and the diameter of the side hole closer to the end hole is larger than the diameter of the side hole closer to the delivery section.

[0010] In one possible implementation of this application, the perfusion catheter further includes a radiopaque element disposed in the perfusion section, and each side hole is provided with a radiopaque element. The radiopaque element is used to identify the position of the perfusion catheter in the body.

[0011] In one possible implementation of this application, the length of the infusion section along the axial direction of the catheter body is 10 mm to 50 mm.

[0012] In one possible implementation of this application, the ratio of the inner diameter of the infusion cavity to the inner diameter of the delivery channel ranges from 1.1 to 2.8.

[0013] In one possible implementation of this application, the infusion catheter further includes a connector, the proximal end of the delivery section being connected to the connector, the connector being used to connect to the injection piece.

[0014] In one possible implementation of this application, the infusion catheter further includes a strain relief sleeve, and the proximal end of the delivery section is connected to the connector via the strain relief sleeve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the infusion catheter provided in this application;

[0016] Figure 2 A partial structural diagram of the catheter body in the infusion catheter provided in this application;

[0017] Figure 3 This is a schematic diagram illustrating the working principle of the perfusion catheter provided in this application within a tumor-feeding artery with multiple branches.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Catheter body; 11-Delivery section; 12-Perfusion section; 13-Delivery channel; 14-Perfusion cavity; 15-End hole; 16-Side hole; 2-Iconizing element; 3-Connecting seat; 4-Strain release sleeve; 5-Tumor; 6-Feeding artery branch; 7-Feeding artery; Y-Radial; Z-Axial. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0021] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0022] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0023] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0024] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0025] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0026] In procedures such as transcatheter arterial chemoembolization (TACE), hepatic artery infusion chemotherapy (HAIC), and surgeries requiring intravascular infusion of other fluids, targeted intravascular drug delivery via perfusion catheters is necessary. For example, in liver cancer treatment, multiple blood vessels typically supply the cancer cells. When using perfusion catheters for drug embolization / perfusion therapy, the drug flows from multiple perfusion holes at the distal end of the catheter. However, it is often difficult to distribute the drug evenly to all arteries supplying the tumor, resulting in uneven drug delivery and affecting treatment efficacy.

[0027] This application provides an infusion conduit that can improve the uniformity of liquid flow from multiple infusion holes on the conduit body, thereby facilitating uniform infusion. (Refer to...) Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the infusion catheter provided in this application. Figure 2 This is a partial structural diagram of the catheter body in the infusion catheter provided in this application.

[0028] The infusion catheter provided in this application embodiment includes: a catheter body 1; wherein, the catheter body 1 includes a delivery section 11 and an infusion section 12, the proximal end of the delivery section 11 can be connected to an injection device, the infusion section 12 is located on the distal side of the delivery section 11, the infusion section 12 surrounds to form an infusion cavity 14, the wall of the infusion section 12 has at least two infusion holes communicating with the infusion cavity 14, the delivery section 11 surrounds to form a delivery channel 13, and along the radial direction Y of the catheter body 1, the inner diameter of the infusion cavity 14 is larger than the inner diameter of the delivery channel 13.

[0029] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the catheter body 1 can be configured as a long, thin cylindrical strip. The length and outer diameter of the catheter body 1 can be set according to the specific application scenario of the infusion catheter. The catheter body 1 can be made of materials with good biocompatibility, such as silicone or rubber. For example, based on the function of each part of the catheter body 1, the catheter body 1 can be configured to include a delivery section 11 and an infusion section 12. The delivery section 11 delivers liquids such as drugs to the infusion site in the human body, and the infusion section 12 evenly supplies drugs to various parts of the infusion site.

[0030] For example, the delivery section 11 can be configured as a circular tube with a small outer diameter. The length of the delivery section 11 can be set according to the length of the travel path of the catheter body 1 into the human body, and the length of the delivery section 11 can be greater than the length of the travel path of the catheter body 1 into the human body. The proximal end of the delivery section 11 can be connected to an injection device, which can be a syringe, a delivery pump, etc., to deliver liquids such as drugs into the delivery channel 13 enclosed by the delivery section 11.

[0031] In another example, the infusion section 12 can be configured as a tube with a larger outer diameter and shorter length than the delivery section 11, forming an infusion cavity 14. The infusion cavity 14 communicates with the delivery channel 13, and multiple infusion holes are provided on the wall of the infusion section 12. In this way, after the liquid flows through the delivery channel 13 to the infusion cavity 14, it can flow through the infusion holes to the infusion site in the body. Specifically, along the radial direction Y of the catheter body 1, the inner diameter of the infusion cavity 14 can be set to be larger than the inner diameter of the delivery channel 13, so that the cross-section of the infusion cavity 14 is larger than the cross-section of the delivery channel 13. That is, for the same length, the infusion cavity 14 can hold a larger volume of liquid than the delivery channel 13.

[0032] It should be noted that in this application, "distal" and "proximal" refer to the ends of the catheter, with the Z-axis of the catheter body 1 as the direction of extension. The distal end is the end of the infusion catheter furthest from the operator, meaning it is the end that first enters or is closest to the body. The proximal end is the end of the infusion catheter closest to the operator, meaning it is the end that last enters or is furthest from the body. For example, as... Figure 1 As shown, the far end is Figure 1 The left side of the middle, the proximal end is Figure 1 Right side of the middle.

[0033] The infusion catheter provided in this embodiment, by configuring the catheter body 1 as including a delivery section 11 and an infusion section 12, allows liquids such as drugs to be delivered to the vicinity of the infusion portion in the human body through the delivery channel 13 formed by the delivery section 11. Furthermore, multiple infusion holes are provided on the wall of the infusion section 12, allowing liquid flowing into the infusion chamber 14 to be infused into the infusion portion from multiple points through these holes, thus improving the infusion efficiency of drugs, etc. Simultaneously, by setting the inner diameter of the infusion chamber 14 to be larger than the inner diameter of the delivery channel 13, the infusion chamber 14 has a larger space than the delivery channel 13 of the same length. This results in a more uniform pressure distribution of the liquid within the infusion chamber 14 after the liquid, such as drugs, flows into it. Consequently, the pressure of the liquid near each infusion hole is consistent or nearly consistent, which in turn helps to ensure that the flow rate of liquid flowing out from each infusion hole is consistent or nearly consistent. Therefore, the infusion conduit provided in this application embodiment can improve the uniformity of liquid flowing out from multiple infusion holes on the conduit body 1, which is beneficial to achieving the purpose of uniform infusion.

[0034] In some possible embodiments of this application, such as Figure 1 and Figure 2 As shown, the infusion chamber 14 has a spindle-shaped structure.

[0035] In this embodiment of the application, the infusion section 12 can be configured as an approximately spindle-shaped structure so that the infusion cavity 14 also becomes an approximately spindle-shaped structure.

[0036] For example, along the axial direction Z of the catheter body 1, the two ends of the infusion cavity 14 can be approximately frustum-shaped, while the middle part of the infusion cavity 14 can be approximately cylindrical. Alternatively, along the axial direction Z of the catheter body 1, the infusion cavity 14 can be approximately shaped like two identical frustums joined together (the larger bases of the two frustums are joined). In this way, along the axial direction Z of the catheter body 1, the outer diameter of the two ends of the infusion section 12 is small, and the outer diameter of the middle part is large. That is, the inner diameter of the two ends of the infusion cavity 14 is small (the inner diameter of the two ends of the infusion cavity 14 is still larger than the inner diameter of the delivery channel 13), and the inner diameter of the middle part is large, thereby making the infusion cavity 14 have a spindle-shaped structure.

[0037] In the above embodiments, by setting the perfusion cavity 14 to a spindle-shaped structure, the connection between the perfusion section 12 and the delivery section 11 can be smoothly and continuously transitioned, and the inner diameter of the perfusion cavity 14 can be gradually and continuously increased, thereby making the space of the perfusion cavity 14 of the same length larger than the space of the delivery channel 13. Furthermore, the outer diameter of the distal end of the perfusion section 12 can be gradually and continuously decreased, making the distal end of the perfusion section 12 approximately conical, which helps to reduce the resistance when inserting the catheter body 1 into the blood vessel.

[0038] In some possible embodiments of this application, reference is made to Figure 3 , Figure 3This is a schematic diagram illustrating the working principle of the perfusion catheter provided in this application within a multi-branched tumor-feeding artery. Figure 1 and Figure 2 As shown, the infusion port includes an end hole 15 and at least two side holes 16. The end hole 15 penetrates the wall of the distal end of the infusion section 12 along the axial direction Z of the catheter body 1, and each side hole 16 penetrates the wall of the infusion section 12 along the radial direction Y.

[0039] In this embodiment, an end hole 15 serving as an injection port and multiple side holes 16 can be provided on the injection section 12. The end hole 15 can be provided on the pipe wall at the distal end of the injection section 12, so that the end hole 15 penetrates the pipe wall of the injection section 12 along the axial direction Z of the conduit body 1.

[0040] For example, the diameter of the end hole 15 can be set to be smaller than the inner diameter of the infusion chamber 14, that is, the diameter of the end hole 15 is smaller than the minimum inner diameter of the infusion chamber 14. Simultaneously, the inner diameter of the end hole 15 can be determined based on the outer diameter of the guidewire used with the infusion catheter, and the inner diameter of the end hole 15 can be larger than the outer diameter of the guidewire. This not only helps to maintain appropriate diameters for both the end hole 15 and the side hole 16 on the infusion section 12, but also reduces the resistance between the catheter body 1 and the guidewire, allowing the catheter body 1 to advance rapidly along the guidewire.

[0041] In another example, multiple side holes 16 can be provided on the circumferential wall of the infusion section 12, each side hole 16 penetrating the wall of the infusion section 12 along the radial direction Y of the conduit body 1. For example, at least two side holes 16 can be provided on the circumferential wall of the infusion section 12 along the axial direction Z of the conduit body 1, or at least two side holes 16 can be located on the same cross section (the cross section perpendicular to the axial direction Z) of the infusion section 12.

[0042] In the above embodiment, since the perfusion section 12 is provided with an end hole 15 and multiple side holes 16, the liquid in the perfusion chamber 14 can flow through the end hole 15 to the blood supply artery 7 that supplies blood to the tumor 5, etc., and the liquid in the perfusion chamber 14 can flow through the multiple side holes 16 to multiple blood supply artery branches 6 respectively, so that drugs and other liquids can be perfused into multiple blood vessels simultaneously and uniformly.

[0043] In some possible embodiments of this application, such as Figure 2 As shown, at least two side holes 16 are distributed along the axial direction Z in the injection section 12, and the diameter of the side hole 16 near the end hole 15 is larger than the diameter of the side hole 16 near the conveying section 11.

[0044] In this embodiment, multiple side holes 16 can be distributed along the axial direction Z of the conduit body 1 on the circumferential wall of the infusion section 12. For example, two, three, or four equal numbers of side holes 16 can be provided on the same cross-section of the circumferential wall of the infusion section 12, and at least two rings of side holes 16 can be provided, with the same ring of side holes 16 located on the same cross-section of the circumferential wall of the infusion section 12.

[0045] For example, along the axial direction Z of the conduit body 1, the diameter of the side hole 16 near the end hole 15 can be larger than the diameter of the side hole 16 near the conveying section 11, that is, the closer the side hole 16 is to the end hole 15, the larger its diameter.

[0046] In the above embodiment, since at least two side holes 16 are distributed along the axial direction Z in the injection section 12, and the diameter of the side hole 16 near the end hole 15 is larger than the diameter of the side hole 16 near the conveying section 11, even if the pressure of the liquid at the far end of the injection chamber 14 is less than the pressure of the liquid at the near end of the injection chamber 14, the liquid flowing out from different side holes 16 can have a consistent or nearly consistent flow rate, which is beneficial to keep the flow rate of the liquid flowing out from each end hole 15 and side hole 16 of the injection section 12 uniform.

[0047] In some possible embodiments of this application, such as Figure 1 As shown, the infusion catheter also includes a radiopaque element 2, which is disposed in the infusion section 12, and each side hole 16 is provided with a radiopaque element 2. The radiopaque element 2 is used to identify the position of the infusion catheter in the body.

[0048] In this embodiment, a developing element 2 can be provided on the infusion section 12. The developing element 2 can be made of an X-ray-impermeable material, such as a platinum-tungsten alloy, tantalum, or gold. The developing element 2 can be configured as a semi-annular or complete annular shape and can be embedded within the infusion section 12.

[0049] For example, a developing element 2 can be provided for each side hole 16. For instance, the developing element 2 can be set as an annular shape, and the annular developing element 2 can be fitted over the positions of the multiple side holes 16 in the same ring. In this case, the developing element 2 does not block or obstruct the side holes 16.

[0050] In the above embodiments, since each side hole 16 is provided with a contrasting element 2, after the catheter body 1 is inserted into the body, the position of the perfusion segment 12 in the body can be quickly determined by the contrasting element 2, and it can be determined whether the side hole 16 is facing the blood supply artery branch 6. Thus, the position of the perfusion segment 12 in the body can be quickly and accurately adjusted so that the side hole 16 is facing the blood supply artery branch 6.

[0051] In some possible embodiments of this application, the length of the infusion section 12 along the axial direction Z of the catheter body 1 is 10 mm to 50 mm.

[0052] In this embodiment, the length of the infusion section 12 can be set according to the specific application scenario of the infusion catheter. For example, the length of the infusion section 12 can be set from 10mm to 50mm. Specifically, the length of the infusion section 12 can be set to 10mm, 15mm, 20mm, 24mm, 28mm, 32mm, 35mm, 40mm, 45mm, 48mm, or 50mm, etc. This embodiment does not limit the specific length of the infusion section 12.

[0053] In the above embodiments, since the length of the perfusion section 12 is 10mm to 50mm, the required perfusion catheter can be selected according to the specific application scenario of the perfusion catheter so that the perfusion section 12 of the perfusion catheter matches the structural characteristics of the perfusion site in the human body, thereby improving the effect of drug and other liquid perfusion.

[0054] In some possible embodiments of this application, the ratio of the inner diameter of the infusion cavity 14 to the inner diameter of the delivery channel 13 ranges from 1.1 to 2.8.

[0055] In this embodiment, the outer diameters of the infusion section 12 and the delivery section 11 can be set according to the specific application scenario of the infusion conduit. For example, the wall thickness of the delivery section 11 and the wall thickness of the infusion section 12 can be the same or nearly the same, or the wall thickness of the infusion section 12 can be greater than the wall thickness of the delivery section 11.

[0056] For example, the outer diameter of the conveying section 11 can be set to 0.6 mm to 1.5 mm, such as 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, or 1.5 mm. The outer diameter of the filling section 12 can be set to 0.7 mm to 1.7 mm, such as 0.7 mm, 0.9 mm, 1.2 mm, 1.4 mm, 1.5 mm, or 1.7 mm. In this way, the inner diameter of the filling cavity 14 can be 1.1 to 2.8 times the inner diameter of the conveying channel 13, so that the inner diameter of the filling cavity 14 is larger than the inner diameter of the conveying channel 13.

[0057] In the above embodiments, since the ratio of the inner diameter of the infusion chamber 14 to the inner diameter of the delivery channel 13 ranges from 1.1 to 2.8, the required infusion catheter can be selected according to the specific application scenario of the infusion catheter so that the size of the infusion chamber 14 meets the delivery rate of liquids such as drugs, thereby improving the effect of infusion of liquids such as drugs.

[0058] In some possible embodiments of this application, such as Figure 1 As shown, the infusion catheter also includes a connector 3, and the proximal end of the delivery section 11 is connected to the connector 3. The connector 3 is used to connect to the injection piece.

[0059] In this embodiment, a connector 3 can be provided in the infusion catheter to connect the proximal end of the delivery section 11 to the injection component. For example, the injection component can be a syringe, a delivery pump, etc. The connector 3 can be a device that facilitates sealing and insertion, such as a needle hub that matches the syringe barrel, to facilitate connection between the syringe barrel tip and the needle hub. The connector 3 can be sealed and fixed by bonding, laser welding, or other methods.

[0060] In the embodiments of this application, such as Figure 1 As shown, a strain relief sleeve 4 can also be installed in the infusion conduit to connect the proximal end of the delivery section 11 to the connecting seat 3 via the strain relief sleeve 4.

[0061] For example, the strain relief sleeve 4 can be made of a material with a hardness less than that of the conduit body 1. The strain relief sleeve 4 can be shaped like an approximate frustum, and a through hole can be provided inside the strain relief sleeve 4. The proximal end of the strain relief sleeve 4 can be sealed and fixedly connected to the connecting seat 3, and the distal end of the strain relief sleeve 4 can be sealed and connected to the proximal end of the conveying section 11. In this way, the conduit body 1 and the connecting seat 3 are connected and communicated through the strain relief sleeve 4. In this way, when the proximal end of the conveying section 11 is subjected to force, the force on the proximal end of the conveying section 11 can be transmitted to the strain relief sleeve 4, causing the strain relief sleeve 4 to bend and deform. That is, the strain relief sleeve 4 can reduce the occurrence of damage to the conveying section 11 due to bending of the proximal end of the conveying section 11 during use.

[0062] In the above embodiments, since the delivery section 11 and the connecting seat 3 are connected by the strain relief sleeve 4, the risk of bending at the proximal end of the delivery section 11 can be reduced. The connecting seat 3 can also quickly connect the catheter body 1 and the injection component, which is beneficial to improving the convenience of using the infusion catheter.

[0063] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way.

Claims

1. An infusion catheter, characterized in that, include: The catheter body includes a delivery section and an infusion section. The proximal end of the delivery section can be connected to an injection device. The infusion section is located on the distal side of the delivery section. The infusion section encloses and forms an infusion cavity. The wall of the infusion section has at least two infusion holes communicating with the infusion cavity. The delivery section encloses and forms a delivery channel. Along the radial direction of the catheter body, the inner diameter of the infusion cavity is larger than the inner diameter of the delivery channel.

2. The infusion catheter according to claim 1, characterized in that, The infusion cavity has a spindle-shaped structure.

3. The infusion catheter according to claim 1, characterized in that, The infusion port includes an end hole and at least two side holes. The end hole penetrates the wall of the distal end of the infusion section along the axial direction of the conduit body, and each of the side holes penetrates the wall of the infusion section along the radial direction.

4. The infusion catheter according to claim 3, characterized in that, The diameter of the end hole is smaller than the inner diameter of the injection cavity.

5. The infusion catheter according to claim 3, characterized in that, At least two of the side holes are distributed along the axial direction in the injection section, and the diameter of the side hole closer to the end hole is larger than the diameter of the side hole closer to the delivery section.

6. The infusion catheter according to claim 5, characterized in that, The infusion catheter also includes a radiopaque element, which is disposed in the infusion section, and each of the side holes is correspondingly provided with the radiopaque element. The radiopaque element is used to identify the position of the infusion catheter in the body.

7. The infusion catheter according to any one of claims 1 to 6, characterized in that, Along the axial direction of the catheter body, the length of the infusion section is 10 mm to 50 mm.

8. The infusion catheter according to any one of claims 1 to 6, characterized in that, The ratio of the inner diameter of the infusion cavity to the inner diameter of the delivery channel ranges from 1.1 to 2.

8.

9. The infusion catheter according to any one of claims 1 to 6, characterized in that, The infusion catheter also includes a connector, the proximal end of the delivery section is connected to the connector, and the connector is used to connect to the injection device.

10. The infusion catheter according to claim 9, characterized in that, The infusion catheter also includes a strain relief sleeve, and the proximal end of the delivery section is connected to the connector via the strain relief sleeve.

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