Catheter structure of ablation electrode and ablation electrode dissector

Abstract

The utility model provides a catheter structure of an ablation electrode and an ablation electrode dissector. The catheter structure of the ablation electrode comprises an inner tube, a hook knife installed on the inner tube, an installation part installed at the end, away from the hook knife, of the inner tube and an outer tube connected to the inner tube in an interference and sleeving mode, and the outer tube comprises a combined tube and an insulating tube covering the combined tube. The combined pipe comprises a first connecting pipe and a second connecting pipe, and the first connecting pipe and the second connecting pipe are arranged at a preset distance A in a spaced mode. A boss is arranged on the end face, away from the second connecting pipe, of the first connecting pipe, and the inner pipe is pushed by the elastic assembly to stretch out and draw back to the hook knife in the length direction of the outer pipe and is in lap joint with the end face of the boss. The preset distance A of the combined pipe is set, so that the conductive area of the first connecting pipe is reduced, the capacitance and the voltage of the hooked knife when the hooked knife is used for electric excision can be reduced, and the possibility of burning caused by overlarge current is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a catheter structure for an ablation electrode and an ablation electrode dissecter. Background Technology

[0002] Currently, surgical procedures utilize tools such as electrocautery hooks and electrocoagulation rods. These tools can only be used for electrocautery and electrocoagulation individually and cannot be switched. When bleeding occurs during surgery, it is often necessary to first use a suction device to remove the blood before inserting the electrocautery knife for cutting. When hemostasis is required, the electrocoagulation device must be switched. During electrocoagulation, the device heats the bleeding point with a high-frequency current, causing tissue proteins to denature and coagulate, thereby achieving hemostasis. However, high-frequency current generates distributed capacitance during transmission, which may lead to current leakage into non-target tissues or other parts of the body, increasing the risk of burns to the patient. The magnitude of the current directly affects the surgical outcome and safety; excessive current may cause excessive thermal damage to tissues. Utility Model Content

[0003] This invention addresses the technical problem of how to avoid burns caused by excessive current during surgical procedures by providing a conduit structure for an ablation electrode and an ablation electrode dissecter.

[0004] In view of the above technical problems, this utility model provides a conduit structure for an ablation electrode, including an inner tube, a hook blade mounted on the inner tube, a mounting portion mounted on the inner tube at one end away from the hook blade, an outer tube interference-fitted onto the inner tube, a connecting portion sleeved on the outer tube, and an elastic component disposed between the mounting portion and the connecting portion. The mounting portion is provided with a conductive component electrically connected to the inner tube. The outer tube includes a combined tube and an insulating tube covering the combined tube. The combined tube includes a first connecting tube and a second connecting tube, which are spaced apart by a preset distance A. A boss is provided on the end face of the first connecting tube away from the second connecting tube. The inner tube extends and retracts along the length direction of the outer tube to the hook blade and overlaps with the end face of the boss under the push of the elastic component.

[0005] Preferably, the length of the first connecting pipe is 4mm-100mm; the length of the preset distance A is greater than or equal to 4mm.

[0006] The combined tube is made of conductive material, and two guide holes are symmetrically arranged at the end of the first connecting tube.

[0007] Preferably, the hook knife includes a handle mounted on the inner tube at one end away from the mounting portion and a blade head connected to the handle.

[0008] Preferably, the blade head includes a bent portion and a hook portion integrally formed and connected with the bent portion.

[0009] Preferably, the inner tube is provided with a mounting groove for mounting the knife handle, and both the inner tube and the outer tube are provided with insulating sleeves.

[0010] Preferably, the elastic component includes a fixing bracket sleeved on the outer tube for connecting the connecting part, a spring sleeved on the fixing bracket, an elastic hook disposed on the mounting part, and two positioning holes spaced apart on the connecting part for engaging with the elastic hook.

[0011] Preferably, the elastic component further includes a switching button, the switching button including a buckle mounted on the connecting part and a key shell connected to the buckle, the key shell being provided with an actuating block that mates with the positioning hole.

[0012] Preferably, the conductive components are a conductive spring and a power plug disposed on the mounting portion, and the inner tube is connected to the power plug through the conductive spring.

[0013] Preferably, the end of the mounting part away from the hook blade is provided with an air pipe that connects to the outer tube, and an air valve is installed on the air pipe.

[0014] This invention also provides an ablation electrode dissecter, which includes the catheter structure of the ablation electrode described above.

[0015] In this invention, an inner tube fitted with a hook blade is interference-fitted into the inner cylinder of an outer tube, and the inner tube is electrically connected to a conductive component. The inner tube is normally energized during operation. An elastic component connects the mounting part and the connecting part, allowing the inner tube to extend and retract along the length of the outer tube under the push of the elastic component. Specifically, when the elastic component is compressed, it pushes the inner tube outwards towards the port of the outer tube, at which point the energized hook blade can be used to cut and separate lesion tissue. When the elastic component is released, it pushes the inner tube back towards the mounting part until the contact surface of the hook blade and the outwardly extending boss overlaps. At this point, the energized hook blade contacts the contact surface of the boss, making the contact surface conductive. The hook blade and the contact surface form an electrocoagulation plane that can be used for electrocoagulation hemostasis during surgery. Furthermore, the combined tube consists of a first connecting tube and a second connecting tube, with a preset distance A between them. An insulating tube covers the combined tube. This preset distance A reduces the conductive area of ​​the first connecting tube, thereby reducing the capacitive voltage of the hook blade during electrocautery and preventing the possibility of burns due to excessive current. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1This is a schematic diagram of the overall structure of the conduit for the ablation electrode provided in one embodiment of the present invention;

[0018] Figure 2 This is a structural cross-sectional view of the outer tube provided in an embodiment of this utility model;

[0019] Figure 3 yes Figure 1 A partial structural diagram of point A;

[0020] Figure 4 yes Figure 1 Another partial structural diagram;

[0021] Figure 5 This is a schematic diagram of the structure of a switching button provided in one embodiment of the present invention.

[0022] The reference numerals in the accompanying drawings are as follows:

[0023] 1-Inner tube, 101-Mounting slot, 2-Hook, 201-Handle, 202-Knife head, 2021-Bending part, 2022-Hooking part, 3-Mounting part, 4-Outer tube, 41-Combined tube, 411-First connecting tube, 412-Second connecting tube, 413-Boss, 42-Insulating tube, 43-Guide hole, 5-Connecting part, 6-Fixing bracket, 7-Spring, 8-Elastic hook, 9-Positioning hole, 10-Switch button, 1001-Snap head, 1002-Key shell, 1003-Touch block, 11-Conductive spring, 12-Power plug, 13-Air valve. Detailed Implementation

[0024] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] It should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0026] like Figures 1 to 5As shown, an embodiment of this utility model provides a conduit structure for an ablation electrode, including an inner tube 1, a hook 2 mounted on the inner tube 1, a mounting portion 3 mounted on the inner tube 1 at one end away from the hook 2, an outer tube 4 interference-fitted onto the inner tube 1, a connecting portion 5 sleeved on the outer tube 4, and an elastic component disposed between the mounting portion 3 and the connecting portion 5. The mounting portion 3 is provided with a conductive component electrically connected to the inner tube 1. The outer tube 4 includes a combined tube 41 and an insulating tube 42 covering the combined tube 41. The combined tube 41 includes a first connecting tube 411 and a second connecting tube 412, which are spaced apart by a preset distance A. A boss 413 is provided on the end face of the first connecting tube 411 away from the second connecting tube 412. The inner tube 1 extends and retracts along the length direction of the outer tube 4 under the push of the elastic component until it reaches the hook 2 and overlaps with the end face of the boss 413. The boss 413 is provided on the end face of the first connecting pipe 411 away from the second connecting pipe 412, so that the end of the first connecting pipe 411 extends outward to form a contact surface that can be connected to the hook 2. The length of the insulating pipe 42 is not specifically limited, as long as its length is sufficient to indirectly connect the first connecting pipe 411 and the second connecting pipe 412 of the combined pipe 41.

[0027] In the above embodiments of this utility model, the inner tube 1 with the hook 2 is interference-fitted into the inner cylinder of the outer tube 4, and the inner tube 1 is electrically connected to the conductive component. The inner tube 1 is in a normally energized state during operation. The elastic component connects the mounting part 3 and the connecting part 5, so that the inner tube 1 extends and retracts along the length direction of the outer tube 4 under the push of the elastic component. That is, when the elastic component is compressed, it pushes the inner tube 1 to extend towards the port of the outer tube 4. At this time, the hook 2, which is in an energized state, can be used to cut and separate lesion tissue. When the elastic component is released, it pushes the inner tube 1 back towards the mounting part 3 until the contact surface of the hook 2 and the protrusion 413 extends outward and overlaps. At this time, the contact surface of the hook 2, which is in an energized state, contacts the protrusion 413, making the contact surface conductive. The hook 2 and the contact surface constitute an electrocoagulation plane that can be used for electrocoagulation hemostasis in surgery.

[0028] Furthermore, the combined tube 41 is composed of a first connecting tube 411 and a second connecting tube 412, and the first connecting tube 411 and the second connecting tube 412 are spaced apart by a preset distance A. The insulating tube 42 is wrapped around the combined tube 41. Thus, the preset distance A reduces the conductive area of ​​the first connecting tube 411, thereby reducing the capacitor voltage of the hook 2 when used for electric cutting to a safer range, so as to avoid the possibility of burns caused by excessive current.

[0029] In one embodiment, such as Figures 1 to 2As shown, the length of the first connecting tube 411 is 4mm-100mm; the length of the preset distance A is greater than or equal to 4mm. The length of the combined tube 41 is not specifically limited and is determined according to the surgical requirements. Understandably, the length of the preset distance A can be set according to actual needs. By setting the preset distance A, the conductive area of ​​the combined tube 41 can be significantly reduced, which directly leads to a reduction in distributed capacitance. A reduction in distributed capacitance means that under the same voltage and frequency, the capacitive reactance increases, thereby reducing the leakage current through the human body.

[0030] In one specific embodiment, if the length of the first connecting tube 411 is set to 30mm, and the electrocoagulation output voltage is 4000V, the voltage through the capacitor is reduced from 2000V to about 267V, thereby greatly reducing the risk of burns to the patient due to excessive current during the operation.

[0031] In one embodiment, such as Figures 1 to 2 As shown, the combined tube 41 is made of conductive material, and two guide holes 43 are symmetrically arranged at the end of the first connecting tube 411. Understandably, smoke and blood generated during surgery can be drawn out through the guide holes 43 of the outer tube 4.

[0032] In one embodiment, such as Figures 3 to 4 As shown, the hook knife 2 includes a handle 201 mounted on the inner tube 1 at the end away from the mounting part 3, and a blade head 202 connected to the handle 201. It can be understood that the hook knife 2 consists of a handle 201 and a blade head 202. The handle 201 is mounted on the end of the inner tube 1 away from the mounting part 3, and the blade head 202 protrudes from the end of the inner tube 1 to facilitate cutting and separation operations during surgery.

[0033] The blade head 202 includes a bent portion 2021 and a hook portion 2022 integrally formed and connected to the bent portion 2021. It is simple to manufacture and has high structural strength. Furthermore, the connection methods of the bent portion 2021 and the hook portion 2022 include, but are not limited to, welding, bonding, and snap-fit ​​connections.

[0034] In one embodiment, such as Figure 1 As shown, the inner tube 1 is provided with a mounting groove 101 for mounting the knife handle 201, and both the inner tube 1 and the outer tube 4 are provided with insulating sleeves. Understandably, the knife handle 201 is installed in the mounting groove 101 on the inner tube 1, and the installation method can be welding, which can improve the stability of the connection between the hook knife 2 and the inner tube 1. The insulating sleeves on both the inner tube 1 and the outer tube 4 isolate the electrical conductivity between the outer tube 4 and the inner tube 1, and also prevent electrical conductivity between the inner tube 1 and the outer tube 4 from posing a danger to the surgical operator.

[0035] In one embodiment, such as Figure 1As shown, the elastic component includes a fixing frame 6 sleeved on the outer tube 4 for connecting the connecting part 5, a spring 7 sleeved on the fixing frame 6, an elastic hook 8 disposed on the mounting part 3, and two positioning holes 9 spaced apart on the connecting part 5 to engage with the elastic hook 8. Understandably, the fixing frame 6 is fixedly sleeved on the side of the outer tube 4 with the insulating sleeve away from the stepped surface 402. The fixing frame 6 is provided with a limiting ring that restricts the movement of one end of the spring 7. The outer contour of the limiting ring is larger than the diameter of the spring 7. The end of the connecting part 5 near the stepped surface 402 is smaller than the outer contour of the limiting ring. The diameter of the end of the mounting part 3 near the other end of the spring 7 is equal to the latter being larger than the diameter of the spring 7. Thus, the spring 7 is movably installed between the inner cylinder of the connecting part 5 and the mounting part 3, and the connecting part 5 is sleeved on the outer wall of the mounting part 3. Insert the inner tube 1 into the outer tube 4, push the mounting part 3 toward the connecting part 5, and the elastic hook 8 engages with the positioning hole 9 to complete the installation of the electrocautery structure; the distance between the two positioning holes 9 determines the stroke of the hook 2 extending out of the contact surface of the boss 413. Among them, the positioning hole 9 on the connecting part 5 near the step surface 402 is the cutting position positioning hole 9. When the elastic hook 8 engages with the cutting position positioning hole 9, the stroke of the hook 2 is the longest, and the lesion can be cut and separated at this time; the other positioning hole 9 is the electrocautery position positioning hole 9. When the elastic hook 8 engages with the electrocautery position positioning hole 9, the hook 2022 of the hook 2 abuts against the contact surface of the boss 413 to form an electrocautery plane, and hemostasis electrocautery can be performed at this time.

[0036] In one embodiment, such as Figure 5 As shown, the elastic component also includes a switching button 10, which includes a buckle 1001 mounted on the connecting part 5 and a key shell 1002 connected to the buckle 1001. The key shell 1002 is provided with an actuating block 1003 that mates with the positioning hole 9. That is, when the actuating block 1003 on the key shell 1002 is pressed, the actuating block 1003 presses the elastic hook 8 mounted in the cutting position positioning hole 9. At this time, the pressure released by the spring 7 forces the mounting part 3 away from the connecting part 5, so that the elastic hook 8 is engaged in the electrocoagulation position positioning hole 9; pressing the mounting part 3 pushes the mounting part 3 toward the connecting part 5, at which time the spring 7 is compressed, so that the elastic hook 8 is engaged in the cutting position positioning hole 9. In this way, the surgeon can switch between cutting and electrocoagulation hemostasis with one hand without frequently changing instruments.

[0037] In one embodiment, such as Figure 1As shown, the conductive components are a conductive spring 11 and a power plug 12 disposed on the mounting part 3. The inner tube 1 is connected to the power plug 12 through the conductive spring 11. Understandably, the end of the inner tube 1 can be connected to the conductive spring 11 through a conductive connecting block. When the power plug 12 is connected to an external power source, both the inner tube 1 and the hook 2 are in a conductive state. Further, the conductive spring 11 is disposed on the inner tube 1. The end of the conductive spring 11 away from the hook 2 is disposed on the opposite side of the elastic hook 8 and is on the same horizontal line as the end of the elastic hook 8. When the elastic component is released, it pushes the inner tube 1 to retract towards the mounting part 3, causing the hook 2 to contact the port of the outer tube 4. The end of the inner tube 1 away from the hook 2 is connected to the power plug 12 through the conductive spring 1 to achieve conductivity. At this time, the hook 2, which is in a charged state, contacts the slot 401, making the stepped surface 402 conductive. The contact surface between the hook 2 and the boss 413 constitutes an electrocoagulation plane that can be used for electrocoagulation hemostasis in surgery.

[0038] In another embodiment, the end of the outer tube 4 away from the connecting part 5 can be set as a flat port, that is, set as a stepped end face without the groove 401. When the elastic component is released, it pushes the inner tube 1 to retract towards the mounting part 3, causing the hook knife 2 to contact the contact surface of the boss 413 of the outer tube 4, which can also form an electrocoagulation plane for electrocoagulation hemostasis in surgery.

[0039] In one embodiment, such as Figures 1 to 2 As shown, the end of the mounting part 3 away from the hook knife 2 is provided with an air pipe that connects to the outer tube 4. An air valve 13 is installed on the air pipe, and the air pipe is connected to an external air source. The air valve 13 can adjust the flow rate of the gas according to the actual needs of the operation. When the air pipe and the outer tube 4 are connected to an external air source, the smoke and blood generated during the operation can be sucked out through the guide hole 43 of the outer tube 4.

[0040] Understandably, the catheter structure of the ablation electrode in the above embodiments allows the operator to perform the switching between cutting and separating the lesion, electrocoagulation hemostasis, and smoke aspiration with a single hand during surgical procedures, such as laparoscopic surgery. This eliminates the need for frequent and repeated changes of the electrocautery device, electrocoagulation instrument, and smoke aspiration instrument. Simultaneously, smoke can be aspirated to maintain a clear anatomical surface. Furthermore, the ablation electrode catheter structure can also be used in open surgery by simply adjusting the inner tube 1 and outer tube 4 to appropriate lengths.

[0041] This utility model also provides an ablation electrode dissecter, including an inner tube 1, a hook 2 mounted on the inner tube 1, a mounting part 3 mounted on the inner tube 1 at one end away from the hook 2, an outer tube 4 interference-fitted onto the inner tube 1, a connecting part 5 sleeved on the outer tube 4, and an elastic component disposed between the mounting part 3 and the connecting part 5. The mounting part 3 is provided with a conductive component electrically connected to the inner tube 1. The outer tube 4 includes a combined tube 41 and an insulating tube 42 covering the combined tube 41. The combined tube 41 includes a first connecting tube 411 and a second connecting tube 412, which are spaced apart by a preset distance A. A boss 413 is provided on the end face of the first connecting tube 411 away from the second connecting tube 412. The inner tube 1 is extended and retracted along the length direction of the outer tube 4 under the push of the elastic component to the hook 2 and overlap with the end face of the boss 413. The boss 413 is located on the end face of the first connecting tube 411 away from the second connecting tube 412, so that the end of the first connecting tube 411 extends outward to form a contact surface that can be connected to the hook 2. In the above-mentioned ablation electrode dissecter of this utility model, the combined tube 41 is composed of the first connecting tube 411 and the second connecting tube 412, and the first connecting tube 411 and the second connecting tube 412 are spaced apart by a preset distance A. The insulating tube 42 covers the combined tube 41. Thus, the preset distance A reduces the conductive area of ​​the first connecting tube 411, thereby reducing the current of the hook when used for electrocautery, so as to avoid the possibility of burns caused by excessive current.

[0042] The above are merely embodiments of the catheter structure and ablation electrode dissecter of this utility model, and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A conduit structure for an ablation electrode, characterized in that, The device includes an inner tube (1), a hook blade (2) mounted on the inner tube (1), a mounting portion (3) mounted on the inner tube (1) at one end away from the hook blade (2), an outer tube (4) interference-fitted onto the inner tube (1), a connecting portion (5) fitted onto the outer tube (4), and an elastic component disposed between the mounting portion (3) and the connecting portion (5). The mounting portion (3) is provided with a conductive component electrically connected to the inner tube (1). The outer tube (4) includes a composite tube (41) and a covering portion that covers the composite tube. The insulating tube (42) on (41) includes a first connecting tube (411) and a second connecting tube (412). The first connecting tube (411) and the second connecting tube (412) are spaced apart by a preset distance A. A boss (413) is provided on the end face of the first connecting tube (411) away from the second connecting tube (412). The inner tube (1) is pushed by the elastic component and extends along the length direction of the outer tube (4) to the hook (2) and overlaps with the end face of the boss (413).

2. The conduit structure of the ablation electrode according to claim 1, characterized in that, The length of the first connecting pipe (411) is 4mm-100mm; the length of the preset distance A is greater than or equal to 4mm.

3. The conduit structure of the ablation electrode according to claim 2, characterized in that, The combined tube (41) is made of conductive material, and two guide holes (43) are symmetrically arranged at the end of the first connecting tube (411).

4. The conduit structure of the ablation electrode according to claim 1, characterized in that, The hook knife (2) includes a handle (201) mounted on the inner tube (1) at one end away from the mounting part (3) and a blade head (202) connected to the handle (201); the blade head (202) includes a bent part (2021) and a hook-shaped part (2022) integrally formed and connected to the bent part (2021).

5. The conduit structure of the ablation electrode according to claim 4, characterized in that, The inner tube (1) is provided with a mounting groove (101) for mounting the knife handle (201), and both the inner tube (1) and the outer tube (4) are provided with insulating sleeves.

6. The conduit structure of the ablation electrode according to claim 1, characterized in that, The elastic component includes a fixing bracket (6) sleeved on the outer tube (4) for connecting the connecting part (5), a spring (7) sleeved on the fixing bracket (6), an elastic hook (8) provided on the mounting part (3), and two positioning holes (9) spaced apart on the connecting part (5) to engage with the elastic hook (8).

7. The conduit structure of the ablation electrode according to claim 6, characterized in that, The elastic component also includes a switching button (10), which includes a buckle (1001) mounted on the connecting part (5) and a key shell (1002) connected to the buckle (1001). The key shell (1002) is provided with an actuating block (1003) that cooperates with the positioning hole (9).

8. The conduit structure of the ablation electrode according to claim 6, characterized in that, The conductive components are a conductive spring (11) and a power plug (12) disposed on the mounting part (3), and the inner tube (1) is connected to the power plug (12) through the conductive spring (11).

9. The conduit structure of the ablation electrode according to claim 1, characterized in that, An air pipe (13) connected to the outer tube (4) is provided at the end of the mounting part (3) away from the hook (2), and an air valve is installed on the air pipe (13).

10. An ablation electrode dissecting device, characterized in that, The conduit structure includes the ablation electrode as described in any one of claims 1 to 9.

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