A medical catheter

Abstract

The present invention provides a medical catheter comprising: a tube body, a pressure sensor, a head electrode, a support base for supporting the head electrode, and a first insulator, wherein the tube body is an elastic body, the pressure sensor is used to sense the deformation of the tube body; the tube body includes a first connecting portion disposed at the distal end of the tube body, the support base includes a second connecting portion, the second connecting portion being connected to the first connecting portion so that the head electrode is fixed to the distal end of the tube body; and the first insulator is disposed between the first and second connecting portions. The addition of the first insulator between the support base and the tube body prevents electrical conduction due to contact between the support base and the tube body, thereby improving the insulation between the head electrode and the pressure sensor and resolving the problem of low force accuracy when using a pressure sensor to measure force in an electrophysiological catheter.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a medical catheter. Background Art

[0002] In recent years, catheter systems have been used for interventional treatment of conditions such as arrhythmias and refractory hypertension. For example, in the treatment of atrial fibrillation, a type of arrhythmia, an ablation or mapping catheter is passed through a vein or artery into the heart to map the location or pathway of abnormal electrical signals. Energy is then applied to ablate the tissue, thereby heating it with impedance to create non-conductive ablation lesions in the tissue, achieving a therapeutic effect. Another example is renal artery ablation for the treatment of refractory hypertension. The ablation catheter is passed from the artery into the artery connecting the abdominal aorta and the kidneys, ablating and blocking the parasympathetic nerve pathway, thereby lowering blood pressure.

[0003] During ablation procedures, the contact force between the distal catheter tip electrode and the tissue is a key factor influencing the depth of the ablation lesion. When the contact force is low, the ablation lesion is shallow and cannot effectively isolate abnormal electrical signals or nerve conduction. However, when the contact force is high, safety risks increase. To mitigate this effect, a pressure sensor can be used to sense the contact force between the distal catheter tip and the tissue. However, when using such a pressure sensor to measure force, it has been found that the ablation current can interfere with the pressure sensor's current signal, resulting in low accuracy in the measured force. Summary of the Invention

[0004] An object of the present invention is to provide an electrophysiological catheter to solve one or more problems in the prior art.

[0005] The inventors discovered that when the pressure sensor is used to measure force, the reason why the ablation current interferes with the current signal of the pressure sensor is due to poor insulation between the support base and the elastic body currently used to support the head electrode.

[0006] In view of this, in order to solve the above problems, the present invention provides a medical catheter, comprising: a tube body, a pressure sensor, a head electrode, a support base for supporting the head electrode, and a first insulator, wherein:

[0007] The tube body is an elastic body, and the pressure sensor is used to sense the deformation of the tube body;

[0008] The tube body includes a first connecting portion, the support seat includes a second connecting portion, and the second connecting portion is connected to the first connecting portion, so that the head electrode is fixed to the distal end of the tube body;

[0009] The first insulator is disposed between the first connecting portion and the second connecting portion.

[0010] Optionally, in the medical catheter, the second connecting portion is embedded in the first connecting portion, and the first insulator is an insulating tube, which is sleeved on the second connecting portion.

[0011] Optionally, in the medical catheter, the length of the first insulator matches the length of the first connecting portion and / or the second connecting portion.

[0012] Optionally, in the medical catheter, the surface of the first insulator has a concave-convex structure formed by roughening.

[0013] Optionally, in the medical catheter, the medical catheter further includes a second insulator, and the second insulator is arranged between the first connecting portion and the head electrode.

[0014] Optionally, in the medical catheter, the second insulator is an insulating ring.

[0015] Optionally, in the medical catheter, the radial outer dimension of the second insulator is not smaller than the outer diameter of the first connecting portion.

[0016] Optionally, in the medical catheter, the surface of the second insulator has a concave-convex structure formed by roughening.

[0017] Optionally, in the medical catheter, the first connecting portion has a first through hole extending radially therethrough, the first insulator has a second through hole extending radially therethrough, the second connecting portion has a groove, the first through hole, the second through hole, and the groove are connected in sequence, wherein the first through hole and the second through hole are configured to allow glue to pass through, and the groove is configured to accommodate at least a portion of the glue passing through the first through hole and the second through hole.

[0018] Optionally, in the medical catheter, the groove is axially arranged along the outer surface of the second connecting part, and the second connecting part has at least one groove, and the at least one groove is evenly distributed along the circumference of the second connecting part.

[0019] Optionally, in the medical catheter, the number of the grooves is three, and the cross-section of the groove along the radial direction of the second connecting portion is U-shaped, and the cross-section of the groove along the axial direction of the second connecting portion is rectangular.

[0020] Optionally, in the medical catheter, the outer surface of the second connecting portion has a plurality of pits.

[0021] Optionally, in the medical catheter, the inner surface of the first connecting portion has a concave-convex structure formed by roughening.

[0022] Optionally, in the medical catheter, the groove includes a first limiting portion, the first through hole includes a second limiting portion, and the medical catheter further includes a fixing member, which is clamped to the first limiting portion and the second limiting portion to limit the relative position of the second connecting portion and the first connecting portion.

[0023] Compared with the prior art, the medical catheter provided by the present invention has the following beneficial effects:

[0024] The medical catheter provided by the present invention includes: a tube body, a pressure sensor, a head electrode, a support base for supporting the head electrode, and a first insulator, wherein the tube body is an elastomer, and the pressure sensor is used to sense the deformation of the tube body; the tube body includes a first connecting portion disposed at the distal end of the tube body; the support base includes a second connecting portion, the second connecting portion being connected to the first connecting portion, so that the head electrode is fixed to the distal end of the tube body; and the first insulator is disposed between the first and second connecting portions. The addition of the first insulator between the support base and the tube body prevents electrical conduction due to contact between the support base and the tube body, thereby improving the insulation between the head electrode and the pressure sensor and resolving the problem of low force accuracy when using a pressure sensor to measure force in an electrophysiological catheter.

[0025] Furthermore, the medical catheter provided by the present invention also includes a second insulator, which is arranged between the first connecting portion and the head electrode. Since the second insulator is added between the support seat and the head electrode, electrical conductivity caused by contact between the head electrode and the elastomer can be avoided, thereby further improving the insulation between the head electrode and the pressure sensor. In addition, to ensure the bonding strength between the head electrode and the distal end of the catheter, the reserved gap between the head electrode and the distal end of the catheter must be small. When the voltage of radiofrequency ablation reaches a certain value, it is easy to cause the electric field to concentrate in the gap and produce a corona phenomenon, which will lead to local discharge. The medical catheter provided by the present invention adds the second insulator between the support seat and the head electrode, thereby solving the problem of local discharge caused by the corona phenomenon caused by the small gap between the tube body and the head electrode.

[0026] Furthermore, the connecting surfaces of the support seat and / or the tube body, the surface of the first insulator (including the inner surface and the outer surface) and / or the surface of the second insulator (including the two opposite surfaces) are all roughened. On the one hand, it can increase the surface friction, and on the other hand, when the glue is filled, the glue can be solidified to produce small castings, thereby improving the bonding strength, improving the connection stability between the insulator, the head electrode support seat and the tube body, and making the insulation effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a medical catheter provided by an embodiment of the present invention;

[0028] Figure 2 A schematic structural diagram of a tube body provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of a support base provided with a head electrode provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of an insulating tube and an insulating ring in an embodiment of the present invention;

[0031] Figure 5 This is a comparison chart of the qualified rate of DC insulation resistance of conduits in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the arrangement of the first limiting portion in an embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the arrangement of the second limiting portion in an embodiment of the present invention;

[0034] Figure 8 Schematic diagram of the arrangement of the second through hole in an embodiment of the present invention;

[0035] Figure 9 This is a schematic structural diagram of another insulating tube in an embodiment of the present invention;

[0036] Figure 10 for Figure 1 The medical catheter is shown in section along line AA after being filled with glue to form a cast unit;

[0037] Figure 11 for Figure 8 The cross section of the medical catheter along line BB is shown after the fixing member is inserted and glue is applied.

[0038] The descriptions of the reference numerals are as follows:

[0039] 11-tube body; 12-pressure sensor; 21-head electrode; 22-support seat; 111-first connecting part, 221-second connecting part; 31-insulating tube; 32-insulating ring; 100-first through hole; 200-groove; 500-second through hole; 400-pit; 300-third through hole; 201-first limiting part; 101-second limiting part; 41-fixing part. DETAILED DESCRIPTION

[0040] The following is a detailed description of the medical catheter of the present invention, with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are highly simplified and not to exact scale, serving only to facilitate and clearly illustrate the embodiments of the present invention. Furthermore, the structures depicted in the drawings are often portions of actual structures. In particular, different drawings may utilize different scales, depending on the emphasis required.

[0041] As used in the present invention, the term "proximal end" generally refers to the end close to the operator, the term "distal end" generally refers to the end close to the patient close to the lesion, "one end" and "the other end" as well as "proximal end" and "distal end" generally refer to two corresponding parts, which include not only the endpoints, unless the content clearly indicates otherwise.

[0042] For the sake of simplicity, in the description of some parts of this embodiment, the tip electrode at the distal end of the catheter is configured as an ablation electrode, which contacts the blood vessel wall or tissue and can apply energy to perform ablation. However, this application does not limit the tip electrode to being configured only as an ablation electrode, but can also be configured as other electrodes, such as a mapping electrode. Those skilled in the art should be able to apply the corresponding description to other types of electrodes and other fields outside the field of electrophysiology, such as esophageal ablation, after making appropriate modifications to the details.

[0043] Please refer to Figure 1 The embodiment of the present invention provides a medical catheter, which includes: a tube body 11, a pressure sensor 12, a head electrode 21, a support base 22 for supporting the head electrode 21, and a first insulator ( Figure 1 (not shown), wherein the tube body 11 is an elastic body, and the pressure sensor 12 is provided on the tube body 11 for sensing the deformation of the tube body 11.

[0044] Please refer to Figure 2 The tube body 11 includes a first connecting portion 111, and the first connecting portion 111 is provided at the distal end of the tube body 11. Figure 3 The support base 22 includes a second connecting portion 221, which is connected to the first connecting portion 111, so that the head electrode 21 is fixed to the distal end of the tube body 11. The first insulator is provided between the first connecting portion 111 and the second connecting portion 221 to separate the first connecting portion 111 and the second connecting portion 221.

[0045] The material of the first insulator can be polyimide or other polymer materials with excellent insulating properties. The pressure sensor 12 may include multiple strain gauges disposed on the outer wall of the tube body 11 to sense strain in multiple directions. For example, the number of strain gauges may be three, evenly distributed along the circumference of the tube body 11. The tube body 11 is adapted to accommodate a saline tube and a conductive wire. It preferably has an inner diameter of 0.5 mm to 2.5 mm and can be made of nickel-titanium alloy or other materials with excellent elasticity and resilience. In practical applications, the support base 22 may be provided with a third through hole 300 along the axial direction. The third through hole 300 is provided at least at the second connecting portion 221 and communicates with the tube body 11 to accommodate the passage of a saline tube and a conductive wire. The head electrode 21 and the support base 22 may be integrally formed or welded together. The head electrode 21 preferably has six holes, but may also be non-porous or multi-porous. The head electrode 21 and the support base 22 may be made of platinum-iridium alloy or stainless steel.

[0046] When the tip electrode 21 contacts the vessel wall or tissue surface, it experiences a contact force, causing the tube 11 to deform. Consequently, the electrical signal from the pressure sensor 12 on the tube 11 changes, and this signal is transmitted to an external control terminal, which calculates the magnitude and direction of the contact force based on the received signal. However, in the prior art, the ablation current interferes with this signal during the transmission of this electrical signal because the support base supporting the tip electrode and the tube is only connected by adhesive, resulting in poor insulation.

[0047] The medical catheter provided in the embodiment of the present invention has a first insulator added between the support base 22 and the tube body 11. This prevents electrical conduction between the support base 22 and the tube body 11 due to contact. This improves the insulation between the head electrode 21 and the pressure sensor 12, thereby resolving the issue of low force accuracy when the medical catheter utilizes the pressure sensor 12 for force measurement.

[0048] In addition, to ensure the bonding strength between the head electrode and the tube body, the reserved gap between the head electrode and the tube body must be small. When the voltage of radiofrequency ablation reaches a certain value, the electric field is concentrated in the gap and corona phenomenon is generated, which will lead to local discharge.

[0049] In view of this, the medical catheter preferably also includes a second insulator. The second insulator can be made of polyimide or other polymeric materials with excellent insulating properties. This second insulator, positioned between the tube body 11 and the head electrode 21, prevents the head electrode 21 from contacting the elastomer and thus conducting electricity. This further improves the insulation between the head electrode 21 and the pressure sensor, and also addresses the issue of corona and localized discharge caused by the small gap between the tube body 11 and the head electrode 21.

[0050] In order to improve the bonding strength, preferably, the second connecting portion 221 of the support seat 22 is embedded in the first connecting portion 111, and the length of the second connecting portion can be about 2mm. Figure 4 To achieve a good insulation effect, the first insulator is preferably an insulating tube 31. Preferably, the inner surface of the tube body 11 has a rough portion, which can be formed by mechanical treatment such as grinding or other chemical treatment. The second insulator is an insulating ring 32. The insulating tube 31 is sleeved on the second connecting portion 221, the insulating ring 32 is sleeved on the insulating tube 31, or the insulating ring 32 is sleeved on the second connecting portion 221 and arranged axially parallel to the insulating tube 31. Further preferably, the length of the insulating tube 31 matches the length of the first connecting portion 111 and / or the second connecting portion 221 (i.e., the length of the axial surface connecting the first connecting portion 111 and the second connecting portion 221), and the outer diameter of the insulating ring 32 is not less than the outer diameter of the distal end of the tube body 11. In other words, the tube body 11 is completely isolated from the support seat 22 and the head electrode 21 by the insulating tube 31 and the insulating ring 32, thereby achieving the best insulation effect. Among them, the outer contour of the insulating ring 32 is not limited to a circle, and can also be a polygon or an irregular shape. In this embodiment, preferably, the inner surface of the first connecting part 111, the outer surface of the second connecting part 221, the surface of the first insulator (including the inner surface and the outer surface) and / or the surface of the second insulator (including the two opposite sides) have a concave-convex structure formed by roughening treatment, and the roughening treatment includes mechanical grinding, physical etching, chemical etching or sandblasting. The concave-convex structure can, on the one hand, increase the friction of the surface, and on the other hand, when the glue is filled, the glue can be solidified to produce small castings, thereby improving the bonding strength between the first insulator, the second insulator, the tube body 11 and the support seat 22, thereby enhancing the connection stability between the first insulator, the second insulator, the head electrode support seat and the tube body, so that the insulation effect is better.

[0051] To simulate the blood and blood pressure environment during actual ablation surgery, as well as the effects of catheter sheathing, bending, torsion, ablation discharge, and other factors on its insulation performance, the following tests were performed on multiple test samples:

[0052] (1) Initial insulation, test the initial insulation performance of the sample;

[0053] (2) Sealing insulation: inject 0.9% saline solution into a sealed can, place the test sample in the saline solution, and then apply a certain air pressure, preferably 0.3 MPa, for more than 15 hours, and then test the DC insulation resistance;

[0054] (3) After the sheath is passed through fatigue, the sheath is placed in 0.9% saline solution, and the saline temperature is maintained at about 37°C. The catheter is repeatedly passed through the sheath 100 times before testing;

[0055] (4) Insulation after bending: Place the bending fatigue mold in 0.9% saline solution, insert the catheter tip of the test sample from one end of the mold to the other end, and then rotate the catheter 180° and repeat the operation. Repeat this operation 200 times before testing;

[0056] (5) Insulation after torque resistance: fix the head electrode 21 in the torque tester, rotate 90° clockwise and counterclockwise, and then test the insulation performance;

[0057] (6) Insulation after service life: 0.9% saline solution is maintained at a temperature of approximately 37°C and the saline impedance is approximately 120Ω. The catheter is placed in the saline solution, the power is set to 60W, the discharge time is 120s, and this discharge is repeated 125 times before the insulation performance is measured.

[0058] The samples tested above include:

[0059] Sample 1: The catheter provided in this embodiment includes the insulating tube 31 and the insulating ring 32;

[0060] Sample 2: does not contain the insulating tube 31 and the insulating ring 32, and the other structures are the same as those of Sample 1;

[0061] Sample 3: does not contain the insulating ring 32, and other structures are consistent with Sample 1.

[0062] See Figure 5 , Figure 5 The above-mentioned insulation test was performed on Samples 1, 2 and 3, and then a line graph was drawn based on the qualified rate of the DC insulation resistance of the head electrode 21 and the elastomer. The results showed that the insulation performance of Sample 1 including the insulating tube 31 and the insulating ring 32 was significantly improved.

[0063] It should be noted that in this embodiment, the second connection portion 221 of the support base is embedded in the tube body 11 to achieve the connection between the second connection portion 221 of the support base and the tube body 11. Accordingly, the insulating tube is sleeved on the second connection portion 221 of the support base, and the insulating ring is sleeved on the insulating tube or the second connection portion 221 of the support base. In other embodiments, the second connection portion 221 of the support base 22 can also be sleeved on the tube body 11 to connect the head electrode 21 to the distal end of the tube body 11. In this case, the insulating tube is sleeved on the tube body 11, and the insulating ring is sleeved on the insulating tube or the tube body 11.

[0064] In this embodiment, the support seat may further have a coupling portion for coupling with the head electrode 21 , and the coupling portion and the second connecting portion 221 may be integrally formed.

[0065] In addition, for ablation catheters, the tip docking area is small and is easily affected by various forces before and after passing through the sheath and during the operation, or by thermal expansion and cold contraction during perfusion. Therefore, in order to ensure safety during the ablation operation, the bonding strength of the tip must be guaranteed.

[0066] In view of this, in a medical catheter provided in this embodiment, preferably, please refer to Figure 10 and Figure 11 The following configuration is made: the first connecting portion 111 has a first through-hole 100 extending radially therethrough, the first insulator has a second through-hole 500 extending radially therethrough, and the second connecting portion 221 has a groove 200. The first through-hole 100, the second through-hole 500, and the groove 200 are sequentially connected. The first through-hole 100 and the second through-hole 500 are configured to allow glue to pass through, and the groove 200 is configured to accommodate at least a portion of the glue that passes through the first through-hole 100 and the second through-hole 500. This design allows the glue to fill the groove 200 after passing through the first through-hole 100. After curing, a strong cast body is formed between the support seat 22 and the tube body 11, enhancing their tensile, compressive, and torsional resistance.

[0067] Please refer to Figure 3In order to meet the actual bonding strength requirements and the actual process difficulty, in this embodiment, the groove 200 is axially arranged along the outer surface of the second connecting part 221, and the second connecting part 221 has a plurality of the grooves 200, and the plurality of the grooves 200 are evenly distributed along the circumference of the second connecting part 221. The groove 200 can be a U-shaped groove (that is, the cross-section of the groove along the radial direction of the second connecting part 221 is U-shaped). Preferably, the groove 200 is long and narrow, that is, the cross-section of the groove along the axial direction of the second connecting part 221 is rectangular, and the ratio of the axial length of the groove 200 along the second connecting part 221 to the total length of the second connecting part 221 is greater than 1:2, but this embodiment is not limited to this. Furthermore, in this embodiment, it is preferred that the second connecting part 221 has three grooves 200 to avoid causing the support seat 22 to be easily deformed while meeting the actual bonding strength requirements.

[0068] In this embodiment, there is no specific limitation on the specific shape and number of the grooves 200. It is sufficient to ensure that the grooves 200 can form a cast structure after being filled with glue, and that the cast structure can enhance the bonding strength between the first connecting portion 111 and the second connecting portion 221. For example, in other embodiments, the grooves 200 can also be provided along the circumference of the second connecting portion 221, and a plurality of the circumferentially provided grooves 200 can be arranged radially in sequence to resemble a thread.

[0069] In addition, the outer surface of the second connecting portion 221 preferably has a plurality of dimples 400. The dimples 400 can be formed by methods such as bead blasting, laser etching, or chemical etching. In other embodiments, considering the difficulty of bead blasting, laser etching, or chemical etching, the outer surface of the second connecting portion 221 can also be roughened to form a concave-convex structure to form the cast body.

[0070] For further optimization, please refer to Figure 6 In this embodiment, the groove 200 includes a first limiting portion 201, please refer to Figure 7 , the first through hole 100 includes a second limiting portion 101, please refer to Figure 11The medical catheter also includes a fixing member 41, which can be made of zirconium oxide or other high-hardness materials. The fixing member 41, the first limiting portion 201, and the second limiting portion 101 have matching cross-sections. The fixing member 41 is snap-fitted to the first limiting portion 201 and the second limiting portion 101, acting as a rivet and defining the relative position of the second connecting portion 221 and the first connecting portion 111. After glue is applied, the glue fills the gap between the fixing member 41, the second connecting portion 221, and the first connecting portion 111, forming an interlocking structure that further enhances the catheter's tensile, compressive, and torsional resistance. In some embodiments, the first limiting portion 201, the second limiting portion 101, and the fixing member 41 can have circular cross-sections. In other embodiments, the first limiting portion 201 can also have other shapes, such as a square, and the fixing member 41 and the limiting member can be configured accordingly.

[0071] like Figure 6 As shown, the first limiting portion 201 can be provided at the distal end of the groove 200. Figure 7 As shown, the second limiting portion 101 can be disposed at the distal end of the first through hole 100. However, this embodiment is not limited thereto; the first limiting portion 201 can also be disposed at other portions of the groove 200, such as the middle portion of the groove 200. To achieve a secure engagement with the limiting member, the width of the first limiting portion 201 can be greater than that of other portions of the groove 200 adjacent to the first limiting portion 201, and / or the depth of the first limiting portion 201 can be greater than that of other portions of the groove 200 adjacent to the first limiting portion 201.

[0072] This embodiment does not limit the shape of the first through hole 100 except the second limiting portion 101. For example, please refer to Figure 8 In some other embodiments, the second limiting portion 101 constitutes the entire first through hole 100, and the cross section of the first through hole 100 is circular. Correspondingly, referring to FIG9 , the cross section of the second through hole 500 of the insulating tube 31 is also circular, and the size matches.

[0073] In summary, the medical catheter provided by the present invention comprises: a tube body, a pressure sensor, a head electrode, a support base for supporting the head electrode, and a first insulator, wherein the tube body is an elastic body, and the pressure sensor is used to sense the deformation of the tube body; the tube body includes a first connecting portion disposed at the distal end of the tube body; the support base includes a second connecting portion, the second connecting portion being connected to the first connecting portion, so that the head electrode is fixed to the distal end of the tube body; and the first insulator is disposed between the first and second connecting portions. The addition of the first insulator between the support base and the tube body prevents electrical conduction due to contact between the support base and the tube body, thereby improving the insulation between the head electrode and the pressure sensor and resolving the problem of low force accuracy when using a pressure sensor to measure force in an electrophysiological catheter.

[0074] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A medical catheter, characterized in that: include: A tube body, a pressure sensor, a head electrode, a support base for supporting the head electrode, and a first insulator, wherein: The tube body is an elastic body, and the pressure sensor is used to sense the deformation of the tube body; The tube body includes a first connecting portion, which is provided at the distal end of the tube body; the support seat includes a second connecting portion, which is connected to the first connecting portion, so that the head electrode is fixed to the distal end of the tube body; The first insulator is disposed between the first connecting portion and the second connecting portion; The medical catheter further includes a second insulator, which is disposed between the first connecting portion and the head electrode. The second insulator is an insulating ring, and an outer diameter of the insulating ring is not smaller than an outer diameter of the first connecting portion.

2. The medical catheter according to claim 1, wherein The second connecting portion is embedded in the first connecting portion, and the first insulator is an insulating tube sleeved on the second connecting portion.

3. The medical catheter according to claim 2, wherein The length of the first insulator matches the length of the first connecting portion and / or the second connecting portion.

4. The medical catheter according to claim 2, wherein The surface of the first insulator has a concavo-convex structure formed by roughening.

5. The medical catheter according to claim 1, wherein The surface of the second insulator has a concavo-convex structure formed by roughening.

6. The medical catheter according to any one of claims 1 to 5, wherein: The first connecting portion has a first through hole extending radially, the first insulator has a second through hole extending radially, the second connecting portion has a groove, the first through hole, the second through hole and the groove are connected in sequence, wherein the first through hole and the second through hole are configured to allow glue to pass through, and the groove is configured to accommodate at least part of the glue passing through the first through hole and the second through hole.

7. The medical catheter according to claim 6, wherein The groove is axially arranged along the outer surface of the second connecting portion. The second connecting portion has a plurality of the grooves, and the plurality of the grooves are evenly distributed along the circumference of the second connecting portion.

8. The medical catheter according to claim 7, wherein The number of the grooves is three, and the cross-section of the groove along the radial direction of the second connecting portion is U-shaped, and the cross-section of the groove along the axial direction of the second connecting portion is rectangular.

9. The medical catheter according to claim 6, wherein The outer surface of the second connecting portion has a plurality of pits.

10. The medical catheter according to claim 6, wherein The inner surface of the first connecting portion has a concavo-convex structure formed by roughening.

11. The medical catheter according to claim 6, wherein The groove includes a first limiting portion, the first through hole includes a second limiting portion, and the medical catheter further includes a fixing member, which is clamped to the first limiting portion and the second limiting portion to define the relative position of the second connecting portion and the first connecting portion.

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