Flexible radiofrequency ablation catheter with bending-adjustable needle head

Abstract

The utility model provides a flexible radiofrequency ablation catheter with a bending-adjustable needle head. The flexible radiofrequency ablation catheter comprises the needle head; the far end of the flexible pipeline is connected with the needle head; the at least one traction wire is connected with the flexible pipeline; and the actuating piece is connected with the traction wire, and when acting force is applied to the actuating piece, the actuating piece drags the traction wire towards the near end or pushes the traction wire towards the far end, so that the traction wire guides the far end of the flexible pipeline to be bent. The needle head of the flexible radiofrequency ablation catheter is bent by 180 degrees in two directions, so that tumors at harsh positions can be smoothly subjected to operative treatment, and the success rate of an operation is increased.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of medical devices, and in particular to a flexible radiofrequency ablation catheter with an adjustable needle bend. Background Art

[0002] The incidence of malignant tumors is increasing year by year, posing an increasing threat to human health. Traditional treatment methods such as surgery, radiotherapy, chemotherapy and other technologies are becoming more and more mature, but they will inevitably cause varying degrees of damage to the normal functions of the body, and the success rate of treatment still needs to be improved. Radiofrequency ablation is the most mature and widely used ablation treatment method. Its principle is to apply a high-frequency alternating electric field between the positive and negative electrodes of the probe, forcing the charged particles in the tissue to move in the direction of the alternating electric field, causing frictional heat generation, and then causing cell thermal damage.

[0003] Most of the radiofrequency ablation probes on the market are percutaneous puncture probes, which are used to reach the tumor site through percutaneous puncture during surgery for radiofrequency ablation treatment. According to the electrode form, they are divided into monopolar, bipolar and multipolar (claw-shaped) probes. For tumors in some special locations, such as those near natural cavities such as the respiratory tract, esophagus, and urethra, it is difficult for the ablation needle to enter the tumor through percutaneous puncture without causing trauma to the tissues in the cavity. Once the wall of the above cavity is pierced, the result is often fatal. The development of flexible radiofrequency ablation needles that can smoothly reach the target tumor through natural cavities and implement radiofrequency treatment will significantly reduce tissue trauma and improve surgical efficiency, which is of great significance in the treatment of cavity tumors. Traditional flexible radiofrequency ablation needles are usually monopolar needle structures, and the needle cannot be bent. It enters the human body through an endoscope to reach the area around the tumor, and then uses the ablation catheter to transmit thrust to puncture the needle into the tumor. However, the location of each patient's tumor is different. When encountering a tumor in a critical location, it may not be possible to use the bending of the endoscope to bring the needle to the tumor. If the needle of the flexible radiofrequency ablation needle can also be bent, then the needle can be bent again based on the bending of the endoscope to treat tumors in critical locations. Utility Model Content

[0004] In view of the above problems, the present application provides a flexible radiofrequency ablation catheter with an adjustable needle tip to overcome the above problems or at least partially solve the above problems.

[0005] An embodiment of the present application provides a flexible radiofrequency ablation catheter, which includes: a needle; a flexible pipeline, the distal end of which is connected to the needle; at least one traction wire, which is connected to the flexible pipeline; an actuator, which is connected to the traction wire. When a force is applied to the actuator, the actuator drags the traction wire toward the proximal end or pushes the traction wire toward the distal end, so that the traction wire guides the distal end of the flexible pipeline to bend.

[0006] Optionally, the inner wall of the flexible pipeline is provided with a snake bone, and the traction wire is buried in the snake bone.

[0007] Optionally, two axially symmetrically arranged traction wires are embedded in the snake bone, and the traction wires are used to guide the distal end of the flexible tube to bend in a first direction or in a second direction opposite to the first direction.

[0008] Optionally, the actuator includes: a sliding track; a sliding member, the sliding member is slidably disposed on the sliding track, and the traction wire is connected to the sliding member.

[0009] Optionally, the flexible radiofrequency ablation needle device further comprises a roller rotatably disposed on the bracket, and the roller abuts against the traction wire, and the friction between the roller and the traction wire causes the roller to rotate along with the movement of the traction wire.

[0010] Optionally, the sliding member is provided with an adjusting member, the traction wire is wound around the adjusting member, and the adjusting member is used to rotate during assembly to tighten the traction wire.

[0011] Optionally, the flexible radiofrequency ablation catheter is further provided with a hollow handle, the distal end of the handle is connected to the flexible pipeline, and the handle is provided with a slide groove, and the sliding member is slidably arranged on the slide groove.

[0012] Optionally, the flexible radiofrequency ablation catheter is further provided with a wire penetrating through the flexible pipeline, and the proximal end of the wire is connected to the radiofrequency circuit.

[0013] Optionally, the proximal end of the radio frequency line is connected to a quick-connect connector for electrical connection with a host.

[0014] Optionally, the flexible radiofrequency ablation needle device includes a traction wire, which passes around the roller and has two ends embedded in the snake bone.

[0015] It can be seen from the above technical solution that the flexible pipeline of the embodiment of the present application can enter the natural cavity of the human body through an endoscope to the lesion tissue. The adjustable needle bending structure can also enable surgical treatment of tumors in critical locations. The adjusting part can adjust the tightness of the traction wire, and the sliding slider can achieve bidirectional 180° bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of an embodiment of a flexible radiofrequency ablation catheter of the present application;

[0018] Figure 2 It is a schematic diagram of the internal structure of an embodiment of a flexible radiofrequency ablation catheter of the present application;

[0019] Figure 3 It is a schematic diagram of the inner side of a flexible tube of a flexible radiofrequency ablation catheter of the present application;

[0020] Figure 4 This is a schematic diagram of the internal structure of a handle portion of an embodiment of a flexible radiofrequency ablation catheter of the present application;

[0021] Figure 5 It is a cross-sectional view of a sliding member of an embodiment of a flexible radiofrequency ablation catheter of the present application.

[0022] Component number

[0023] 100: flexible radiofrequency ablation catheter; 1: needle; 2: flexible pipeline; 3: snake bone; 4, 11: traction wire; 5, 13: guide wire; 6: fixing part; 7: sliding track; 8: sliding part; 9: handle; 10: adjustment part; 12: roller; 14: radiofrequency circuit; 15: quick connector; 16: slide groove. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0025] The “distal end” mentioned above refers to the end of the flexible radiofrequency ablation catheter away from the operator during the surgical operation; the “proximal end” mentioned above refers to the end of the flexible radiofrequency ablation catheter close to the operator during the surgical operation.

[0026] The specific implementation of the embodiment of the present application is further explained below in conjunction with the accompanying drawings of the embodiment of the present application.

[0027] See also Figures 1 to 5 In a specific implementation of the present application, a flexible radiofrequency ablation catheter 100 is provided, and the flexible radiofrequency ablation catheter 100 includes: a needle 1; a flexible tube 2, the distal end of which is connected to the needle 1; at least one traction wire, which is connected to the flexible tube 2; an actuator, which is connected to the traction wire, and when a force is applied to the actuator, the actuator drags the traction wire toward the proximal end or pushes the traction wire toward the distal end, so that the traction wire guides the distal end of the flexible tube 2 to bend.

[0028] In one embodiment, the inner wall of the flexible pipe 2 is provided with a snake bone 3, and the traction wire is embedded in the snake bone 3. The function of the snake bone 3 is to assist and enhance the bending strength of the traction wire, so that the flexible pipe 2 bends more smoothly, and also prevents the traction wire from breaking. The snake bone 3 can be axially extended and arranged on the inner wall of the flexible pipe 2.

[0029] In one embodiment, two axially symmetrically arranged traction wires 4 are embedded in the snake bone 3, and the traction wires are used to guide the distal end of the flexible tube 2 to bend in a first direction or in a second direction opposite to the first direction. The first direction is, for example, counterclockwise, and the maximum bending amplitude is 90°. Correspondingly, the second direction is clockwise, and the maximum bending amplitude is also 90°. Thus, the maximum bending amplitude of the distal end of the flexible tube 2 is 180° in total.

[0030] In one embodiment, the actuator comprises: a sliding track 7; a sliding member 8, the sliding member 8 is slidably disposed on the sliding track 7, and the traction wire is connected to the sliding member 8. The sliding track 7 can be a sliding rod or a track.

[0031] In one embodiment, the flexible radiofrequency ablation needle device further comprises a roller 12 rotatably arranged on the bracket, and the roller 12 abuts against the traction wire, and the roller 12 rotates with the movement of the traction wire through the friction between the roller 12 and the traction wire. The bracket can be a supporting structure of the sliding track 7 or the handle 9. The traction wire can be set as one, with both ends fixed to the snake bone 3, and the middle parts 4 and 11 abutting against the roller 12.

[0032] like Figure 5 As shown, in one embodiment, the sliding member 8 is provided with an adjusting member 10, and the traction wire is wound on the adjusting member 10. The adjusting member 10 is used to rotate and tighten the traction wire during assembly, so that when the sliding member 8 is pushed and pulled, the angle of the needle 1 can be adjusted immediately to improve the efficiency and success rate of the operation. The adjusting member 10 can be an adjusting pin, and the traction wire can be wound on the adjusting pin. The lower part of the sliding member 8 can be provided with an axial through hole, and the adjusting member 10 is radially penetrated in the lower part of the sliding member 8, so that the traction wire can be wound on the outer periphery of the adjusting member 10 corresponding to the through hole.

[0033] In one embodiment, the flexible radiofrequency ablation catheter is further provided with a hollow handle 9, the distal end of which is connected to the flexible pipeline 2, and the handle 9 is provided with a slide groove 16, on which the sliding member 8 is slidably arranged. A fixing member 6 may also be provided at the connection between the flexible pipeline 2 and the handle 9, for fixing the flexible pipeline 2. The distal end of the snake bone 3 may be connected to the needle 1, and the proximal end may be connected to the fixing member 6. The traction wire passes through the fixing member 6 and is arranged inside the handle 9. The distal end of the sliding track 7 may be connected to the fixing member 6, and the proximal end may be fixed to the supporting structure of the handle 9, so as to provide a sliding path for the sliding member 8.

[0034] In one embodiment, the flexible radiofrequency ablation catheter is further provided with a wire passing through the flexible tube 2, the proximal end 13 of the wire is connected to the radiofrequency circuit 14, the distal end 5 of the wire can be fixedly connected to the needle 1, and the wire can transfer the radiofrequency energy in the radiofrequency circuit 14 to the needle 1.

[0035] In one embodiment, the proximal end of the RF circuit 14 is connected to a quick connector 15 for electrical connection with the host. The quick connector 15 is a standard male and female connector that can be quickly connected and unplugged from the host. An identification resistor is installed inside the quick connector 15. When the quick connector 15 is plugged into the corresponding connector of the host, the host can recognize that it has been inserted in place. When it is not inserted or not inserted in place, an alarm prompt will be issued.

[0036] Flexible tubing with good lubricity and insulation can be selected for the flexible pipeline 2. During the operation, the endoscope first passes through the natural cavity of the human body (oral cavity, anus, urethra, etc.) and cooperates with the light source and imaging system of the endoscope to enter and find the lesion. Then the flexible radiofrequency ablation catheter enters through the instrument channel of the endoscope until the lesion tissue is located for surgical treatment. The technical problem that the metal hard rod of the probe cannot be bent to enter the natural cavity and can only be entered through puncture of the needle 1 is solved. Skin damage and bleeding due to puncture are avoided. The material of the flexible tube can be PTFE, Nylon, PEBAX and other polymer materials. The outer diameter of the flexible tube can be between 1mm and 4mm, and the length of the flexible tube can be between 100mm and 3000mm.

[0037] Due to the differences in patients and lesion organs, the location of the lesion may also vary. For example, if the lesion location is more demanding, the difficulty of the operation will be increased, the operation time will be prolonged, and the success rate of the operation will be reduced. The endoscope can be bent at the front end and the needle 1 of the flexible radiofrequency ablation catheter can be bent by 180 degrees in both directions, so that tumors in demanding locations can also be smoothly treated surgically, thereby improving the success rate of the operation.

[0038] Compared with the traditional radiofrequency ablation needle (percutaneous puncture type), the flexible radiofrequency ablation needle in the embodiment of the present application has a longer tube (about 1m) entering the human body, and the outer tube material is usually a flexible polymer material with a high degassing coefficient under vacuum conditions. Therefore, if a conventional probe is used to pre-make a vacuum tube, the high vacuum degree of the flexible probe needle tube will be difficult to maintain for a long time.

[0039] During the operation, the endoscope first passes through the natural cavity of the human body (oral cavity, anus, urethra, etc.), cooperates with the light source and imaging system of the endoscope to enter and find the lesion location, and then the flexible radiofrequency ablation catheter 100 enters through the instrument channel of the endoscope until the lesion tissue is located for surgical treatment, thereby solving the technical problem that the metal hard rod of the probe cannot bend and enter the natural cavity, and can only enter through puncture of the needle 101. It avoids skin damage and bleeding caused by puncture.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A flexible radiofrequency ablation catheter with an adjustable needle tip, characterized in that: The flexible radiofrequency ablation catheter comprises: Needles; a flexible tube, the distal end of which is connected to the needle; at least one traction wire connected to the flexible pipe; an actuator connected to the traction wire, and when a force is applied to the actuator, the actuator drags the traction wire toward the proximal end or pushes the traction wire toward the distal end, so that the traction wire guides the distal end of the flexible tube to bend, The inner wall of the flexible pipeline is provided with a snake bone, and the traction wire is buried in the snake bone.

2. The flexible radiofrequency ablation catheter according to claim 1, characterized in that: Two axially symmetrically arranged traction wires are embedded in the snake bone, and the traction wires are used to guide the distal end of the flexible pipeline to bend in a first direction or in a second direction opposite to the first direction.

3. The flexible radiofrequency ablation catheter according to claim 1, characterized in that: The actuator comprises: Sliding track; A sliding member is slidably arranged on the sliding track, and the traction wire is connected to the sliding member.

4. The flexible radiofrequency ablation catheter according to claim 1, characterized in that: The flexible radiofrequency ablation catheter also includes a roller rotatably arranged on the bracket, and the roller is in contact with the traction wire. The friction between the roller and the traction wire causes the roller to rotate with the movement of the traction wire.

5. The flexible radiofrequency ablation catheter according to claim 3, characterized in that: The sliding member is provided with an adjusting member, the traction wire is wound around the adjusting member, and the adjusting member is used to rotate during assembly to tighten the traction wire.

6. The flexible radiofrequency ablation catheter according to claim 3, characterized in that: The flexible radiofrequency ablation catheter is also provided with a hollow handle, the distal end of the handle is connected to the flexible pipeline, and the handle is provided with a slide groove, and the sliding member is slidably arranged on the slide groove.

7. The flexible radiofrequency ablation catheter according to claim 6, characterized in that: The flexible radiofrequency ablation catheter is also provided with a wire which passes through the flexible pipeline, and the proximal end of the wire is connected to the radiofrequency circuit.

8. The flexible radiofrequency ablation catheter according to claim 7, characterized in that: The proximal end of the radio frequency line is connected to a quick-connect connector for electrical connection with the host.

9. The flexible radiofrequency ablation catheter according to claim 4, characterized in that: The flexible radiofrequency ablation catheter comprises a traction wire which goes around the roller and has two ends buried in the snake bone.

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