Medical catheter

Abstract

The present invention provides a medical catheter, comprising: a tube body, a head electrode and a support seat for supporting the head electrode; the tube body comprises a first connection part, which is arranged at the distal end of the tube body, and the support seat comprises a second connection part, which is nested with the first connection part to fix the head electrode to the distal end of the tube body; the first connection part has a first through hole that penetrates radially, and the second connection part has a groove, and the first through hole is connected to the groove, wherein the first through hole is configured to allow glue to pass through and penetrate between the first connection part and the second connection part, and the groove is configured to accommodate at least part of the glue passing through the first through hole. That is, by opening a hole on the tube body and grooving the support seat, the glue can be filled into the groove after passing through the first through hole, and then after curing, a firm casting body can be formed between the support seat and the tube body, thereby enhancing its tensile, compressive and torsional properties.

Description

Technical Field

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

[0002] In catheter intervention therapy during electrophysiological surgery, usually an ablation catheter is inserted into the target position in the heart through a vein or artery. After contacting the abnormal electrical signal tissue, radiofrequency energy is applied through the catheter tip electrode to form an ablation lesion, so as to terminate or change the useless electrical signal and achieve the treatment effect.

[0003] The head end of the ablation catheter is divided into a head electrode and a sensing deformation section. Since the butt joint area of these two sections is small, higher requirements for the bonding firmness are inevitably put forward. During ablation, the head end of the catheter will be subjected to greater tensile and compressive forces before and after passing through the sheath; during the catheter bending and turning operations during the surgery, the head end of the catheter will also be subjected to greater torsional, tensile or compressive forces; repeated ablation by repeatedly abutting against the myocardial tissue will also repeatedly be subjected to forces; the thermal expansion during ablation and the cold contraction during perfusion, all these factors will affect the bonding firmness and fatigue resistance of the head end of the catheter. Therefore, the present invention provides a structural design of the catheter head end to improve the bonding strength and ensure the safety during the ablation surgery process. Summary of the Invention

[0004] The purpose of the present invention is to provide a medical catheter to improve the firmness and fatigue resistance of the catheter head end.

[0005] To this end, the present invention provides a medical catheter, comprising: a tube body, a head electrode, and a support seat for supporting the head electrode; the tube body includes a first connection part provided at the distal end of the tube body, the support seat includes a second connection part, and the second connection part is nested with the first connection part to fix the head electrode at the distal end of the tube body;

[0006] The first connection part has a first through hole penetrating radially, the second connection part has a groove, and the first through hole is communicated with the groove. Wherein, the first through hole is configured to allow glue to pass through and penetrate between the first connection part and the second connection part, and the groove is configured to accommodate at least part of the glue passing through the first through hole.

[0007] Optionally, in the medical catheter, the groove is axially arranged along the outer surface of the second connection part, and the second connection part has a plurality of the grooves, and the plurality of grooves are evenly distributed along the circumferential direction of the second connection part.

[0008] Optionally, in the medical catheter, the number of the grooves is three, and the cross-sectional shape of the groove along the radial direction of the second connection part is U-shaped, and the cross-sectional shape of the groove along the axial direction of the second connection part is rectangular.

[0009] Optionally, in the medical catheter, the outer surface of the second connection part has a plurality of pits.

[0010] Optionally, in the medical catheter, the inner surface of the first connection part has an uneven structure formed by roughening treatment.

[0011] Optionally, in the medical catheter, the groove includes a first limiting part, the first through hole includes a second limiting part, and the medical catheter further includes a fixing part, and the fixing part is clamped between the first limiting part and the second limiting part to define the relative positions of the second connection part and the first connection part.

[0012] Optionally, in the medical catheter, the tube body is an elastomer, and the medical catheter further includes a pressure sensor for sensing the deformation of the tube body.

[0013] Optionally, in the medical catheter, the medical catheter includes a first insulator disposed between the second connection part and the first connection part.

[0014] Optionally, in the medical catheter, the first insulator is sleeved on the second connection part, the first insulator has a second through hole, the second through hole communicates with the first through hole and the groove, and the cross section of the second through hole matches the cross section of the first through hole or the groove.

[0015] Optionally, in the medical catheter, the length of the insulating tube matches the length of the first connection part and / or the second connection part.

[0016] Optionally, in the medical catheter, the surface of the first insulator has an uneven structure formed by roughening treatment.

[0017] Optionally, in the medical catheter, the medical catheter includes a second insulator disposed between the tube body and the head electrode.

[0018] Optionally, in the medical catheter, the surface of the second insulator has an uneven structure formed by roughening treatment.

[0019] In summary, compared with the prior art, the medical catheter provided by the present invention has the following beneficial effects:

[0020] The medical catheter includes: a tube body, a head electrode, and a support seat for supporting the head electrode; the tube body includes a first connecting portion disposed at the distal end of the tube body, the support seat includes a second connecting portion, and the second connecting portion is embedded in the first connecting portion to fix the head electrode to the distal end of the tube body; the first connecting portion has a first through hole penetrating in the radial direction, the second connecting portion has a groove, and the first through hole communicates with the groove. Wherein, the first through hole is configured to allow glue to pass through and penetrate between the first connecting portion and the second connecting portion, and the groove is configured to accommodate at least part of the glue passing through the first through hole. That is, by opening a hole in the tube body and grooving in the support seat, the glue can be filled into the groove after passing through the first through hole, and then a firm casting body can be formed between the support seat and the tube body after curing, enhancing its tensile, compressive, and torsional resistance.

[0021] Further, the groove has a first limiting portion, the first through hole includes a second limiting portion, the medical catheter further includes a fixing member, the size of the fixing member matches the cross-sections of the first limiting portion and the second limiting portion, and the fixing member is clamped between the first limiting portion and the second limiting portion to become a rivet connecting the head electrode support seat and the tube body, defining the relative positions of the second connecting portion and the first connecting portion. After applying glue, the glue fills the gaps among the three, connecting the three into an integrated interlocking structure, thereby further enhancing its tensile, compressive, and torsional resistance.

[0022] Further, the surfaces where the support seat, the tube body, the first insulator, and / or the second insulator are in contact are roughened. On the one hand, it can increase the surface friction, and on the other hand, when filling glue, the glue can be cured to generate small casting bodies, thereby improving the bonding strength. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the ablation catheter entering the heart for ablation in the embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of a medical catheter provided by the embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of a tube body provided by the embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of a support seat provided with a head electrode according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the setting of the first limiting portion in the embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the setting of the second limiting part in the embodiment of the present invention;

[0029] Figure 7 For Figure 2 Schematic diagram of the structure of the medical catheter shown with an insulating tube and an insulating ring added;

[0030] Figure 8 Schematic diagram of another medical catheter provided by the embodiment of the present invention;

[0031] Figure 9 Comparison chart of the pull-off strength in the embodiment of the present invention;

[0032] Figure 10 And Figure 11 Schematic diagrams of the insulating tube and the insulating ring exemplified by the embodiments of the present invention respectively;

[0033] Figure 12 For Figure 7 Sectional view of the medical catheter shown along the line A-A after filling with glue to form a casting body;

[0034] Figure 13 For Figure 8 Sectional view of the medical catheter shown along the line B-B after inserting the fixing part and applying glue.

[0035] Among them, the descriptions of each reference numeral are as follows:

[0036] 1 - Distal end of the catheter; 2 - Deflectable section; 3 - Left atrium; 4 - Puncture sheath; 5 - Catheter body; 6 - Ablation catheter; 7 - Control handle; 8 - Circuit board; 9 - Tail wire;

[0037] 11 - Tube body; 21 - Head electrode; 22 - Support seat; 111 - First connecting part; 100 - First through hole; 221 - Second connecting part; 200 - Groove; 300 - Third through hole; 400 - Pit; 201 - First limiting part; 101 - Second limiting part, 31 - Insulating tube; 32 - Insulating ring; 500 - Second through hole; 41 - Fixing part. Detailed implementation manners

[0038] The medical catheter proposed by the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention. In addition, the structures shown in the drawings are often part of the actual structures. In particular, the focus that each drawing needs to show is different, and sometimes different scales are used.

[0039] As used in the present invention, the term "proximal end" generally refers to the end closer to the operator, and the term "distal end" generally refers to the end closer to the patient near 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 otherwise explicitly stated in the context.

[0040] 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 for ablation. However, the present application does not limit that the tip electrode can only be set as an ablation electrode, and it can also be configured as other electrodes, such as mapping electrodes. Those skilled in the art should be able to apply the corresponding description to other types of electrodes and other fields outside the electrophysiology field, such as esophageal ablation and other fields, after making appropriate modifications in details.

[0041] Figure 1 Schematic diagram of the ablation catheter entering the heart for ablation. Please refer to Figure 1 , the ablation catheter 6 includes a catheter distal end 1, a deflectable section 2, a catheter body 5, a control handle 7, a circuit board 8, and a tail wire 9 that are connected in sequence. The catheter distal end 1 is equipped with an ablation electrode and can apply energy for ablation. During application, the ablation catheter 6 will pass through the puncture sheath 4 and enter the left atrium 3 through the inferior vena cava for ablation. The control handle 7 can control the deflectable section 2 to achieve deflection.

[0042] As mentioned above, the docking area at the head end of the ablation catheter is relatively small, and during the process of passing through the sheath and during the operation, it is easily affected by various forces, or affected by the thermal expansion and cold contraction during perfusion. Therefore, to ensure the safety during the ablation operation, it is necessary to ensure the bonding strength of the head end.

[0043] In view of this, please refer to Figure 2 and in combination with Figure 3 and Figure 4 , this embodiment provides a medical catheter, which includes: a tube body 11, a tip electrode 21, and a support seat 22 for supporting the tip electrode 21.

[0044] Among them, as Figure 3 shown, the tube body 11 includes a first connecting portion 111, which is arranged at the distal end of the tube body 11, and the first connecting portion 111 has a first through hole 100 that penetrates radially. As Figure 4As shown, the support base 22 includes a second connecting portion 221. The second connecting portion 221 is embedded in the first connecting portion 111 to fix the head electrode 21 to the distal end of the tube body 11. The second connecting portion 221 has a groove 200, and the first through hole 100 communicates with the groove 200. The first through hole 100 is configured to allow glue to pass through and penetrate between the first connecting portion 111 and the second connecting portion 221. The groove 200 is configured to accommodate at least part of the glue passing through the first through hole 100.

[0045] As Figure 5 shown, by opening a hole in the tube body 11 and axially forming a groove 200 on the outer surface of the second connecting portion 221 of the support base 22, the glue can be filled into the groove 200 after passing through the first through hole 100, and then a firm casting body can be formed between the support base 22 and the tube body 11 after curing, so the tensile, compressive and torsional resistance performances can be enhanced.

[0046] In this embodiment, the head electrode 21 and the support base 22 can be integrally formed or can be integrated by welding. The support base 22 has a third through hole 300, and the third through hole 300 is at least provided in the second connecting portion 221 of the support base 22. The third through hole 300 communicates with the tube body 11 and can be penetrated by a salt water pipe and a wire. The head electrode 21 is preferably in a six-hole form, and can also be non-porous or multi-porous. The materials of the head electrode 21 and the support base 22 can be platinum-iridium alloy or stainless steel.

[0047] Please refer to Figure 4 , 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 portion 221, and the second connecting portion 221 has a plurality of the grooves 200, and the plurality of grooves 200 are evenly distributed along the circumferential direction of the second connecting portion 221. The groove 200 can adopt a U-shaped groove, that is, the cross-sectional shape of the groove along the radial direction of the second connecting portion is U-shaped. Preferably, the groove 200 is long and narrow, and the cross-sectional shape of the groove along the axial direction of the second connecting portion is rectangular. The ratio of the length of the groove 200 along the axial direction of the second connecting portion 221 to the total length of the second connecting portion 221 is greater than 1:2, but this embodiment is not limited thereto. Further, in this embodiment, it is preferred that the second connecting portion 221 has three of the grooves 200 to avoid deformation of the support base 22 easily on the premise of meeting the actual bonding strength requirements.

[0048] In this embodiment, there are no specific restrictions on the specific shape and quantity of the groove 200, as long as it is ensured that a casting body can be formed after the groove 200 is filled with glue, and this casting body can play a role in increasing the bonding strength between the first connecting portion 111 and the second connecting portion 221. For example, in some other embodiments, the groove 200 may also be arranged along the circumferential direction of the second connecting portion 221, and a plurality of the grooves 200 arranged along the circumferential direction are arranged in a similar spiral shape in the radial direction in sequence.

[0049] In other embodiments, it may also be that the first connecting portion 111 is embedded in the second connecting portion 221. The first connecting portion 111 has a through hole, and grooves are formed on the inner surface of the second connecting portion 221. After filling glue in the grooves through the through hole and forming a casting body, the tensile, compressive, and torsional resistance properties can also be increased.

[0050] In addition, preferably, the outer surface of the second connecting portion 221 has a plurality of pits 400. The pits 400 can be formed by methods such as bead blasting, laser etching, or chemical etching. The inner surface of the first connecting portion 111 has an uneven structure formed by roughening treatment, and this roughening treatment includes mechanical grinding, physical etching, chemical etching, or sandblasting, etc. The pits 400 and the uneven structure can, on the one hand, increase the surface friction, and on the other hand, enable the glue to solidify to generate small casting bodies when the glue is filled, thereby improving the bonding strength. In some other embodiments, considering the process difficulty of bead blasting, laser etching, or chemical etching, etc., the outer surface of the second connecting portion 221 can also be roughened to form an uneven structure to form a casting body.

[0051] Further preferably, please refer to Figure 5 , in this embodiment, the groove 200 includes a first limiting portion 201, please refer to Figure 6 , the first through hole 100 includes a second limiting portion 101, please refer to Figure 12, the medical catheter further includes a fixing member 41, and the material of the fixing member 41 can be zirconia or other materials with high hardness. The cross-sections of the fixing member 41, the first limiting portion 201, and the second limiting portion 101 are matched, and the fixing member 41 is clamped between the first limiting portion 201 and the second limiting portion 101, acting as a rivet, and at the same time defining the relative positions of the second connecting portion 221 and the first connecting portion 111. Specifically, the fixing member 41 and the first limiting portion 201 and the second limiting portion 101 can be clamped by interference fit. After applying glue, the glue fills the gaps among the three, connecting the fixing member 41, the second connecting portion 221, and the first connecting portion 111 into an integrated locking structure, thereby further enhancing its tensile, compressive, and torsional resistance. In some specific embodiments, the cross-sections of the first limiting portion 201, the second limiting portion 101, and the fixing member 41 can be circularly arranged. In other specific embodiments, the first limiting portion 201 can also be set in other shapes, such as square, and the fixing member 41 and the second limiting portion 101 can be correspondingly set.

[0052] As Figure 5 shown, the first limiting portion 201 can be arranged at the distal end of the groove 200. Correspondingly, as Figure 6 shown, the second limiting portion 101 can be correspondingly arranged 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 arranged at other parts of the groove 200, such as the middle of the groove 200. To achieve the clamping of the fixing member 41, the width of the first limiting portion 201 can be set to be greater than other parts of the groove 200 adjacent to the first limiting portion 201, and / or the depth of the first limiting portion 201 can be set to be greater than other parts of the groove 200 adjacent to the first limiting portion 201.

[0053] This embodiment does not limit the shape of the first through hole 100 other than the first limiting portion 201. For example, please refer to Figure 8 , in other embodiments, the second limiting portion 101 constitutes all of the first through hole 100.

[0054] To test the bonding strength of the medical catheter provided in this embodiment, for multiple test samples, pull-off strength tests are respectively performed. The test samples include:

[0055] Sample a: The catheter provided in this embodiment includes the fixing member 41, and the surfaces of the support seat 22 and the elastomer are correspondingly designed and processed (including setting the groove 200, the pit 400, and roughening treatment);

[0056] Sample b: It does not include the fixing member 41, and other structures are the same as those of sample a;

[0057] Sample c: The surfaces of the support base 22 and the elastomer are not subjected to corresponding design and treatment (including setting the groove 200, the pit 400, and the roughening treatment), and other structures are the same as those of sample b.

[0058] The results of the pull-off strength tests on samples a, b, and c using a tensile machine are as Figure 9 shown. It can be seen from Figure 9 that the pull-off strengths of samples a and b are much greater than that of sample c, indicating that the relevant surface treatment and structural design can significantly enhance the bonding strength of the catheter head end; in addition, the pull-off strength of sample a is greater than that of sample b, indicating that the design of adding the fixing member 41 further improves the firmness of the catheter head end bonding.

[0059] Optionally, the medical catheter provided in this embodiment has a pressure monitoring function. Specifically, the tube body 11 is an elastomer, preferably with an inner diameter size of 0.5 mm to 2.5 mm. Its material can be nitinol alloy or other materials with excellent elasticity and recovery. The medical catheter further includes a pressure sensor (not shown), and the pressure sensor is arranged on the tube body 11 for sensing the deformation amount of the tube body 11. The support base 22 is a rigid structure. After the second connection portion 221 is embedded in the first connection portion 111, the deformation of the first connection portion 111 will be reduced. When the pressure sensor is set, it should avoid the first connection portion 111, that is, avoid the part where the tube body 11 and the support base 22 are connected. The pressure sensor may include a plurality of strain gauges, and the plurality of strain gauges are arranged on the outer wall of the elastomer to sense strain from multiple directions. For example, the number of the strain gauges is three, and the three strain gauges are evenly distributed along the circumferential direction of the elastomer 11.

[0060] When the head electrode 21 contacts the blood vessel wall or the tissue surface, the head electrode 21 is subjected to a contact force, causing the tube body 11 to deform. Correspondingly, the electrical signal of the pressure sensor arranged on the tube body 11 changes, and the electrical signal is transmitted to an external control end, so that the control end calculates the magnitude and direction of the contact force according to the change of the received electrical signal. During the transmission of this electrical signal, since the support base 22 for supporting the head electrode 21 and the tube body 11 are adhesively connected with poor insulation, the ablation current will interfere with this electrical signal.

[0061] In view of this, the medical catheter provided in this embodiment further includes a first insulator. The material of the first insulator can be polyimide or other polymer materials with excellent insulation properties. The first insulator is disposed between the second connection portion 221 and the first connection portion 111 for spacing the tube body 11 and the support base 22. In this way, it is possible to prevent the support base 22 and the tube body 11 from conducting electricity due to contact, thereby improving the insulation between the head electrode 21 and the pressure sensor and solving the problem of low accuracy of the measured force value when the medical catheter uses the pressure sensor to measure the force value.

[0062] In addition, to ensure the bonding strength between the head electrode 21 and the distal end of the catheter, the reserved gap between the head electrode 21 and the distal end of the tube body 11 must be very small. When the voltage of radiofrequency ablation reaches a certain value, it causes the electric field to concentrate at this gap and generate a corona phenomenon, which will lead to partial discharge.

[0063] In view of this, preferably, the medical catheter further includes a second insulator. The material of the second insulator can be polyimide or other polymer materials with excellent insulation properties. The second insulator is disposed between the tube body 11 and the head electrode 21 to prevent the head electrode 21 from contacting the elastomer and conducting electricity. Therefore, the insulation between the head electrode 21 and the pressure sensor is further improved, and the problem of partial discharge caused by the corona phenomenon due to the small gap between the tube body 11 and the head electrode 21 is also solved.

[0064] In this embodiment, preferably, the surface of the first insulator (including the inner surface and the outer surface), and / or the surface of the second insulator (including the opposite two surfaces) also has an uneven structure. This uneven structure can also be formed by mechanical processing such as grinding or other chemical treatments. Similarly, the uneven structure on the surface of the first insulator and / or the second insulator can also improve the bonding strength between the first insulator, the second insulator, the tube body 11, and the support base 22.

[0065] Please refer to Figure 10 or Figure 11 , to achieve a good insulation effect, preferably, the first insulator is an insulating tube 31, the second insulator is an insulating ring 32, the insulating tube 31 is sleeved on the second connection portion 221, the insulating ring 32 is sleeved on the insulating tube 31, or the insulating ring 32 is sleeved on the second connection portion 221 and is arranged axially in parallel with the insulating tube 31. Figure 7 For Figure 2The structural schematic diagram of the medical catheter shown is provided with an insulating tube and an insulating ring. 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 axially adjacent surface of the first connecting portion 111 and the second connecting portion 221), and the outer radial dimension of the insulating ring 32 is not less than the outer diameter of the distal end of the tube body 11. That is to say, through the insulating tube 31 and the insulating ring 32, the tube body 11 is completely isolated from the support base 22 and the head electrode 21, so that the best insulation effect can be achieved. 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, etc.

[0066] In order to enable the glue to fill the groove 200, the setting of the first insulator should not affect the flow of the glue passing through the first through hole 100 to the groove 200. Therefore, please refer to Figure 12 and in combination with Figure 10 , when the first insulator is the insulating tube 31, the insulating tube 31 has a second through hole 500, the second through hole 500 communicates with the first through hole 100 and the groove 200, and the cross-section of the second through hole 500 matches the cross-section of the first through hole 100 or the groove 200. In this way, the glue can fill the groove after passing through the first through hole 100 and the second through hole 500, and a firm casting body is formed between the support base 22 and the tube body 11. In some specific embodiments, as Figure 10 shown, the cross-section of the second through hole 500 matches the cross-section of the first through hole 100. In this way, please refer to Figure 13 , when the fixing member 41 is provided, the fixing member 41 can define the relative positions of the first connecting portion 111, the second connecting portion 221 and the insulating tube 31, and play the role of a rivet for the three. In some other specific embodiments, please refer to Figure 11 , the second through hole 500 can match the cross-section of the groove 200. In this way, when the glue fills the groove 200 through the first through hole 100, the flow rate of the glue will not be disturbed, and when the fixing member 41 is provided, since the second through hole 500 also has a limiting portion corresponding to the groove 200, therefore, the fixing member 41 can also define the relative positions of the first connecting portion 111, the second connecting portion 221 and the insulating tube 31.

[0067] In summary, the medical catheter provided by the present invention includes: a tube body, a head electrode, and a support seat for supporting the head electrode; the tube body includes a first connection portion disposed at the distal end of the tube body, the support seat includes a second connection portion, and the second connection portion is embedded in the first connection portion to fix the head electrode to the distal end of the tube body; the first connection portion has a first through hole penetrating the side wall, the second connection portion has a groove, and the first through hole communicates with the groove, wherein the first through hole is configured to allow glue to pass through and penetrate between the first connection portion and the second connection portion, and the groove is configured to accommodate at least part of the glue passing through the first through hole. In this way, the glue can pass through the first through hole and fill into the groove, and then a firm casting body can be formed between the support seat and the tube body after curing, enhancing its tensile, compressive, and torsional resistance properties.

[0068] 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 in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure are within the scope of protection of the claims.

Claims

1. A medical catheter, characterized in that, Comprising: A tube body, a head electrode, and a support seat for supporting the head electrode; the tube body includes a first connecting portion disposed at the distal end of the tube body, the support seat includes a second connecting portion, and the second connecting portion is nested with the first connecting portion to fix the head electrode to the distal end of the tube body; The first connecting portion has a first through hole penetrating radially, the second connecting portion has a groove, and the first through hole communicates with the groove. Wherein, the first through hole is configured to allow glue to pass through and penetrate between the first connecting portion and the second connecting portion, and the groove is configured to accommodate at least part of the glue passing through the first through hole; 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, and the fixing member is clamped between the first limiting portion and the second limiting portion to define the relative positions of the second connecting portion and the first connecting portion.

2. The medical catheter according to claim 1, wherein, The groove is axially disposed along the outer surface of the second connecting portion, and the second connecting portion has a plurality of the grooves, and the plurality of grooves are evenly distributed along the circumferential direction of the second connecting portion.

3. The medical catheter according to claim 2, wherein, The number of the grooves is three, and the cross-sectional shape of the groove along the radial direction of the second connecting portion is U-shaped, and the cross-sectional shape of the groove along the axial direction of the second connecting portion is rectangular.

4. The medical catheter according to claim 1, characterized in that, The outer surface of the second connecting portion has a plurality of pits.

5. The medical catheter according to claim 1, characterized in that, The inner surface of the first connecting portion has an uneven structure formed by roughening treatment.

6. The medical catheter according to claim 1, characterized in that, The tube body is an elastomer, and the medical catheter further includes a pressure sensor for sensing the deformation amount of the tube body.

7. The medical catheter according to claim 6, wherein The medical catheter includes a first insulator disposed between the second connecting portion and the first connecting portion.

8. The medical catheter according to claim 7, wherein The first insulator is sleeved on the second connecting portion, the first insulator has a second through hole, the second through hole communicates with the first through hole and the groove, and the cross-section of the second through hole matches the cross-section of the first through hole or the groove.

9. The medical catheter according to claim 8, wherein The length of the first insulator matches the length of the first connecting portion and / or the second connecting portion.

10. The medical catheter according to claim 8, wherein, The surface of the first insulator has an uneven structure formed by roughening treatment.

11. The medical catheter according to claim 8, wherein, The medical catheter includes a second insulator disposed between the tube body and the head electrode.

12. The medical catheter according to claim 11, wherein, The surface of the second insulator has an uneven structure formed by roughening treatment.

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