A thyroid ablation needle

Abstract

The present invention belongs to the technical field of minimally invasive medical devices, and specifically relates to a thyroid ablation needle, comprising a knife bar assembly, a handle, an input assembly arranged at the rear end of the handle, and a puncture head arranged at the front end of the knife bar assembly, the knife bar assembly comprising an inner knife bar and an outer knife bar, the inner knife bar is wrapped with an inner insulating layer, the inner insulating layer and the outer knife bar form a water inlet channel in communication with the water injection pipe of the input assembly, one end of the inner knife bar is electrically connected to the puncture head, and the other end is electrically connected to the conductive cable of the input assembly, one end of the puncture head is fixed with an insulating spacer, and the insulating spacer is provided with a plurality of water outlet grooves in communication with the water inlet channel, one end of the outer knife bar is electrically connected to the conductive cable, and the other end is movably sleeved on the insulating spacer and spaced at a fixed distance from the puncture head. The problem of knife head blockage in the prior art due to the high density and firmness of thyroid nodules and tumors is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of minimally invasive medical devices, and in particular relates to a thyroid ablation needle. Background Art

[0002] The thyroid gland is located below the thyroid cartilage in the human neck, on both sides of the trachea, and is shaped like a butterfly, like a shield. Among neck lumps, thyroid adenomas account for about 50%. Thyroid adenomas are a common benign tumor and generally have no obvious symptoms. When the tumor is large, it can compress the trachea, esophagus, and nerves, causing symptoms such as difficulty breathing, difficulty swallowing, and hoarseness. When the tumor is combined with bleeding and grows rapidly, it will cause local distension and pain. Because benign thyroid tumors may become malignant, some of them are benign, but they are "hot nodules," that is, highly functional.

[0003] Thyroid nodules are a common disease of the endocrine system. In the existing technology, laparoscopic thyroidectomy can reduce the neck scar caused by surgery, but it may cause greater damage to surrounding tissues, and laparoscopic surgery has strict surgical indications. Compared with laparoscopic surgery, ultrasound-guided percutaneous thermal ablation has great advantages, but the anatomical structure of the tissue around the thyroid is complex and important, and there are trachea, large blood vessels, nerves, etc. around it. The existing common thermal ablation is easy to cause damage to the surrounding normal tissues.

[0004] Plasma technology is widely used in medical devices due to its low-temperature ablation characteristics. However, due to the particularity of thyroid tissue, the existing ablation electrodes have large and solid nodules and tumors, and the blood supply to this type of lesion area is very rich. For example, CN 219289674U discloses a plasma ablation puncture needle; when it is used in the thyroid ablation process, the blade is prone to blockage. For surgeons and developers, solving the problem of thyroid ablation needle blade blockage is a technical problem that needs to be overcome urgently. Summary of the invention

[0005] The present application overcomes the problem in the prior art that the blade is easily blocked during the ablation process due to the high density and solidity of thyroid nodules and tumors.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted in the present application is: a thyroid ablation needle, comprising a knife rod assembly, a handle, an input assembly arranged at the rear end of the handle and a puncture head arranged at the front end of the knife rod assembly, the knife rod assembly comprising an inner knife rod and an outer knife rod, the inner knife rod is wrapped with an inner insulating layer, the inner insulating layer and the outer knife rod form a water inlet cavity connected to the water injection pipe of the input assembly through a gap, one end of the inner knife rod is electrically connected to the puncture head, and the other end is electrically connected to the conductive cable of the input assembly, one end of the puncture head is fixed with an insulating sleeve, and the insulating sleeve is provided with a plurality of water outlet grooves connected to the water inlet cavity, one end of the outer knife rod is electrically connected to the conductive cable, and the other end is movably sleeved on the insulating sleeve and spaced a certain distance from the puncture head.

[0007] A further improvement is that the puncture head is provided with a conical head and a connecting part, the connecting part is fixedly connected to the inner knife rod through a connecting hole, an insulating sleeve is fixedly provided on the connecting part, the outer knife rod is movably sleeved on the insulating sleeve and is spaced from the conical head, and one end of the inner insulation layer is sealed and connected to the insulating sleeve.

[0008] A further improvement is that the front end of the insulating spacer is provided with a convex large diameter portion which separates the conical head and the outer blade rod, and the rear end of the convex large diameter portion is provided with a small diameter portion, and the small diameter portion extends backward to completely wrap the portion where the inner blade rod is connected to the connecting portion, and extends into the water inlet cavity between the outer blade rod and the inner blade rod, and the small diameter end can be rotatably sleeved in the outer blade rod, and the water outlet groove is an arc-shaped groove structure which is opened through the convex large diameter portion or the outer side surface of the convex large diameter portion and the small diameter portion.

[0009] A further improvement is that the outer convex large diameter portion is set equal to the maximum outer diameter of the outer tool rod and the conical head.

[0010] A further improvement is that an insulating reinforcement layer is also provided at the front end of the inner blade rod, the front end of the insulating reinforcement layer is sealed with the connecting part and the insulating spacer, and the insulating reinforcement layer is extended and embedded in the water inlet cavity between the inner blade rod and the inner insulating layer.

[0011] A further improvement is that the insulating sleeve is made of insulating ceramic and the inner blade rod is made of metal wire material.

[0012] Further improvement is that: the handle includes a handle shell, a tail shell and an embedded tube, the embedded tube is built into a cavity formed by the handle shell and the tail shell buckle, the embedded tube is provided with an upper channel for the knife rod assembly to pass through and connected to the conductive cable, and a lower channel connected to the water injection pipe, the outer knife rod is provided with a water injection port, and the water injection port is sealed and connected to the lower channel.

[0013] A further improvement is that an outer insulating layer is provided on the outer blade rod, and an exposed section of a fixed length is provided at one end of the outer blade rod close to the puncture head.

[0014] A further improvement is that scale indicating lines are arranged at intervals on the outer blade rod, and the outer insulating layer is made of a transparent material.

[0015] A further improvement is that a sliding limit device is also provided on the knife bar assembly on the front side of the handle.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects:

[0017] 1. The needle puncture head, insulating ceramic and inner knife rod integrated structure and the outer knife rod rotatable design of the present invention, if blockage occurs during the operation, the surgeon can easily manually rotate the puncture needle, combined with the water outlet of physiological saline, the tissue blocked at the water outlet can be effectively cleared, eliminating the needle blockage during the operation, effectively solving the problem of knife head blockage that is prone to occur during surgical ablation, thereby improving the surgical progress of thyroid ablation.

[0018] 2. The insulating spacer with the convex large diameter part and the small diameter part arranged concentrically has a plurality of water outlet grooves with arc-shaped groove structures on its outer cylindrical surface, which increases the water outlet surface and makes the water outlet smooth and fast. At the same time, it well controls the fixed distance between the outer knife rod and the puncture head, and also plays a supporting, limiting and guiding role for the outer knife rod.

[0019] 3. The present invention utilizes the low-temperature characteristics of plasma to ablate thyroid nodules under low-heat damage, thereby reducing patients' pain and medical costs. In clinical surgery, due to the particularity of thyroid tissue, thyroid nodules and tumors are dense and firm, and the blood supply to the lesion area is very rich. The ablation needle is equipped with plasma technology, and its low-temperature characteristics can specifically control the range of ablation thermal damage in the lesion area, which has important practical value for preserving thyroid function and reducing adjacent damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the knife rod assembly and the puncture head of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the knife rod assembly and the puncture head of the present invention.

[0024] Figure 5 It is a schematic diagram of the exploded structure of the tool bar of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the insulating spacer of the present invention.

[0026] Figure 7It is a schematic diagram of the embedded tube structure of the present invention.

[0027] Figure ID:

[0028] Input component 1, handle 2, knife rod component 3, puncture head 4, conical head 41, connecting part 42, connecting hole 43,

[0029] Handle shell 5, tail shell 6, embedded tube 7, outer knife rod 8, scale indicator line 81, inner knife rod 9, sliding limit device 10, conductive cable 11, water injection pipe 12, upper channel 13, lower channel 14, water injection port 15, inner insulation layer 16, outer insulation layer 17, insulation spacer 18, water outlet trough 181, outer convex large diameter part 182, small diameter part 183, insulation reinforcement layer 19, water inlet cavity 21. Implementation

[0030] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the combination or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0032] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0033] like Figure 1As shown: A thyroid ablation needle comprises a handle 2, an input assembly 1 arranged at the rear end of the handle 2 and composed of a conductive cable 11 and a water injection pipe 12, a knife rod assembly 3 and a puncture head 4 connected to the front end of the knife rod assembly 3, the knife rod assembly 3 is installed in the handle 2 and is connected and fixed with the conductive cable 11 and the water injection pipe 12, the knife rod assembly 3 comprises an inner knife rod 9 and an outer knife rod 8, the inner knife rod 9 is wrapped with an inner insulating layer 16, the inner insulating layer 16 and the outer knife rod 8 form a water inlet channel 21 connected to the water injection pipe 12, the inner knife rod 9 One end is electrically connected to the puncture head 4, and the other end is electrically connected to the conductive cable 11. An insulating sleeve 18 is fixedly provided at one end of the puncture head 4, and a plurality of water outlet grooves 181 communicating with the water inlet channel 21 are arranged outside the insulating sleeve 18. One end of the outer knife rod 8 is electrically connected to the conductive cable 11, and the other end is movably sleeved on the insulating sleeve 18 and is arranged at a fixed distance from the puncture head 4. The fixed distance interval is controlled so that the puncture head 4 and the surface of the outer knife rod 8 are excited in the electrolyte to generate conductive plasma, and cannot be broken down, and the distance is 1.5-3mm. Physiological saline is injected from the water injection pipe 12, enters the water inlet channel 21, and flows out along the water outlet groove 181 on the insulating sleeve 18, wrapping the puncture head 4 and the outer knife rod 8 at the lesion, forming a plasma environment, and under the excitation of radio frequency energy, a thin plasma layer is formed at the puncture head 4 to ablate the thyroid diseased tissue. The puncture head 4 and the inner knife rod 9 are both electrically connected and fixed by conductive metal materials, and are sleeved and fixed with the insulating spacer 18 to form an integral structure. The integral structure and the outer knife rod 8 are rotatable and movable. If blockage occurs during the operation, the puncture needle is manually rotated, and the tissue blocked in the water outlet trough 181 can be effectively cleared by combining the water output of physiological saline, which effectively solves the problem of knife head blockage during surgical ablation and greatly shortens the operation process.

[0034] A preferred embodiment: Figure 3As shown, the piercing head 4 is provided with a conical head 41 and a connecting portion 42. The connecting portion 42 is fixedly connected to the inner knife rod 9 through a connecting hole 43. The inner knife rod 9 is made of a metal wire material. After the inner knife rod 9 is inserted into the connecting hole 43, laser high-frequency filler welding is adopted. After welding, the surface oxide layer is removed by pickling, which can effectively improve the connection strength between the piercing head 4 and the inner knife rod 9. An insulating spacer 18 is fixed on the connecting portion 42 and fixed by glue, preferably DG-3S glue; the insulating spacer 18 is an insulating ceramic, which can be fixed by oxide. Aluminum material, the outer blade rod 8 is movably sleeved on the insulating sleeve 18 and is spaced from the conical head 41, one end of the inner insulating layer 16 is sealed and bonded to the insulating sleeve 18 with high-strength structural glue, preferably Thomas high-strength structural glue, so that the puncture head 4, the inner blade rod 9, and the insulating sleeve 18 are fixedly connected into an integral structure, the integral structure is inserted into the outer blade rod 8, and the tail end of the outer blade rod 8 and the inner blade rod 9 are sealed and bonded in the handle 2 with high-strength structural glue to prevent saline from leaking out from the tail end. The setting of the conical head 41 ensures the strength of puncture and reduces the wound surface of the patient. The connecting part 42 is fixedly electrically connected to the inner knife rod 9 through the connecting hole 43, ensuring that the connection is safe and reliable and will not fall off; the insulating spacer 18 is sealed and fixedly connected to one end of the inner insulating layer 16, so that the physiological saline in the water inlet channel 21 arranged between the outer knife rod 8 and the inner insulating layer 16 does not leak, thereby ensuring that the insulation between the puncture head 4 and the outer knife rod 8 as the positive and negative electrodes is not broken down, and the overall operation is stable, safe and reliable.

[0035] A preferred embodiment: Figure 3-6 As shown in the figure, the front end of the insulating sleeve 18 is set as a convex large diameter part 182 separating the conical head 41 and the outer blade 8, and the rear end of the convex large diameter part 182 is provided with a small diameter part 183, and the small diameter part 183 extends backward to completely wrap the part where the inner blade 9 is connected with the connecting part 42, and extends to the water inlet channel 21 between the outer blade 8 and the inner blade 9. The small diameter end 183 can be rotatably sleeved in the outer blade 8, and the water outlet groove 181 is an arc-shaped groove structure that is opened through the convex large diameter part 182 or the outer side of the convex large diameter part 182 and the small diameter part 183. The insulating sleeve 18, which is concentrically arranged with the convex large diameter part 182 and the small diameter part 183, has a plurality of water outlet grooves 181 with arc-shaped groove structures on its outer cylindrical surface, which increases the water outlet surface and makes the water outlet smooth and fast, and at the same time well controls the fixed distance interval between the outer blade 8 and the puncture head 4, and also plays a supporting and limiting guiding role for the outer blade 8.

[0036] A preferred implementation manner: the outer convex large diameter portion 182 is set equal to the maximum outer diameter of the outer knife rod 8 and the conical head 41, ensuring that the knife rod assembly has a beautiful appearance and maintains the stability of the surgical incision surface and smooth water flow from the water outlet 181.

[0037] A preferred embodiment: Figure 3As shown, an insulating reinforcement layer 19 is also provided at the front end of the inner blade rod 9. The front end of the insulating reinforcement layer 19 is bonded and sealed with a high-strength structural glue to the connecting portion 42 and the rear end of the insulating spacer 18. The insulating reinforcement layer 19 is extended and embedded in the water inlet cavity 21 between the inner blade rod 9 and the inner insulating layer 16. The high-strength structural glue can use Thomas high-strength structural glue, which has a smaller gap between the two bonding parts, strong fluidity, can evenly cover the bonding surface, is resistant to cold and hot shocks, and has a good insulating and sealing effect. Insulation protection is added at the connection between the puncture head 4, the inner blade rod 9, and the insulating spacer 18 to prevent leakage of physiological saline in the water inlet cavity 21.

[0038] A preferred embodiment: Figure 2 , 5 As shown in Figures 7, the handle 2 includes a handle shell 5, a tail shell 6 and an embedded tube 7. The embedded tube 7 is embedded in a cavity formed by the handle shell 5 and the tail shell 6. Specifically, the handle shell 5 and the tail shell 6 are snap-connected and fixed with glue. The handle shell 5 is provided with an embedded tube 7. The embedded tube 7 is a double-channel design. The upper channel 13 is used to fix the knife rod assembly 3, and the other end is used to connect the conductive cable 11. One end of the lower channel 14 is used as a saline water injection channel, and the other end is used to connect the water injection pipe 12. A water injection port 15 is provided on the outer knife rod 8. The water injection port 15 is sealed and connected to the lower channel 14 for receiving saline from the water injection pipe 12.

[0039] A preferred embodiment: Figure 2 , 5 As shown, the outer knife rod 8 is also provided with scale indicator lines 81 at intervals, and the outer knife rod 8 is provided with an outer insulating layer 17, which is made of a transparent material. A transparent insulating heat shrink tube is preferably covered on the outer knife rod 8 by heat shrinkage, and a fixed-length exposed section is provided at one end of the outer knife rod 8 close to the puncture head 4; the setting of the fixed-length exposed section ensures the effective generation of plasma, and the wall thickness of the heat shrink tube is ultra-thin, and the single-side wall thickness after heat shrinkage is maintained between 0.015-0.025mm, thereby reducing the size increase caused by insulation and reducing the impact on the surgical incision.

[0040] A preferred embodiment: Figure 1 , 2 As shown, a sliding limit device 10 is also provided on the knife rod assembly 3 on the front side of the handle 2. The device can slide back and forth on the knife rod with a certain damping. Combined with the scale indicator line 81 on the outer knife rod 8, the puncture depth can be limited and judged.

[0041] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A thyroid ablation needle, comprising a knife bar assembly (3), a handle (2), an input assembly (1) arranged at the rear end of the handle (2), and a puncture head (4) arranged at the front end of the knife bar assembly (3), wherein the knife bar assembly (3) comprises an inner knife bar (9) and an outer knife bar (8), and is characterized in that: The inner blade rod (9) is wrapped with an inner insulating layer (16), and a gap between the inner insulating layer (16) and the outer blade rod (8) forms a water inlet channel (21) which communicates with the water injection pipe (12) of the input component (1). One end of the inner blade rod (9) is electrically connected to the puncture head (4), and the other end is electrically connected to the conductive cable (11) of the input component (1). An insulating sleeve (18) is fixedly provided at one end of the puncture head (4), and a plurality of water outlet grooves (181) which communicate with the water inlet channel (21) are provided on the outer periphery of the insulating sleeve (18). One end of the outer blade rod (8) is electrically connected to the conductive cable (11), and the other end is movably sleeved on the insulating sleeve (18) and is spaced a certain distance from the puncture head (4). The puncture head (4) is provided with a conical head (41) and a connecting portion (42); The front end of the insulating spacer (18) is provided as an outwardly convex large-diameter portion (182) for separating the conical head (41) and the outer blade rod (8); the rear end of the outwardly convex large-diameter portion (182) is provided with a small-diameter portion (183); the small-diameter portion (183) extends backward to completely wrap the portion where the inner blade rod (9) and the connecting portion (42) are connected, and extends into the water inlet cavity (21) between the outer blade rod (8) and the inner blade rod (9); the small-diameter portion (183) is rotatably sleeved in the outer blade rod (8); and the water outlet groove (181) is an arc-shaped groove structure that is provided through the outwardly convex large-diameter portion (182) or the outer side surface of the outwardly convex large-diameter portion (182) and the small-diameter portion (183); The piercing head (4) and the inner blade rod (9) are both electrically connected and fixed by conductive metal materials, and are sleeved and fixed with the insulating spacer (18) to form an integral structure. The integral structure and the outer blade rod (8) are rotatably arranged.

2. The thyroid ablation needle according to claim 1, characterized in that: The connecting portion (42) is fixedly connected to the inner blade rod (9) via a connecting hole (43); an insulating sleeve (18) is fixedly provided on the connecting portion (42); the outer blade rod (8) is movably sleeved on the insulating sleeve (18) and spaced from the conical head (41); and one end of the inner insulating layer (16) is sealedly connected to the insulating sleeve (18).

3. The thyroid ablation needle according to claim 1, characterized in that: The outer convex large diameter portion (182) is set to be equal to the maximum outer diameter of the outer shank (8) and the conical head (41).

4. The thyroid ablation needle according to claim 1, characterized in that: The front end of the inner blade rod (9) is also provided with an insulating reinforcement layer (19), the front end of the insulating reinforcement layer (19) is sealed with the connecting portion (42) and the insulating spacer (18), and the insulating reinforcement layer (19) is extended and embedded in the water inlet cavity (21) between the inner blade rod (9) and the inner insulating layer (16).

5. The thyroid ablation needle according to claim 4, characterized in that: The insulating spacer (18) is made of insulating ceramic, and the inner blade rod (9) is made of metal wire material.

6. The thyroid ablation needle according to claim 1, characterized in that: The handle (2) comprises a handle shell (5), a tail shell (6) and an embedded tube (7); the embedded tube (7) is embedded in a cavity formed by snapping the handle shell (5) and the tail shell (6); the embedded tube (7) is provided with an upper channel (13) for the knife bar assembly (3) to pass through and connected to the conductive cable (11) and a lower channel (14) connected to the water injection pipe (12); the outer knife bar (8) is provided with a water injection port (15); the water injection port (15) is sealed and communicated with the lower channel (14).

7. The thyroid ablation needle according to claim 1, characterized in that: An outer insulating layer (17) is provided on the outer blade rod (8), and an exposed section of a certain length is provided at one end of the outer blade rod (8) close to the puncture head (4).

8. The thyroid ablation needle according to claim 7, characterized in that: The outer blade rod (8) is also provided with scale indicator lines (81) at intervals, and the outer insulating layer (17) is made of a transparent material.

9. The thyroid ablation needle according to any one of claims 1 to 8, characterized in that: A sliding limit device (10) is also provided on the knife bar assembly (3) on the front side of the handle (2).

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