Prostate microwave ablation device

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a prostate microwave ablation device which comprises a handle, an outer catheter is fixed to one end of the handle, an ablation cavity and a flushing cavity are formed in the outer catheter, and a needle outlet is formed in the end, away from the handle, of the outer catheter. The ablation cavity and the needle outlet are communicated with each other, the flushing cavity and the needle outlet are communicated with each other, a coil driving unit is assembled at the end, close to the outer catheter, of the interior of the handle, a needle advancing and retreating button is assembled at the upper end of the handle, and the coil driving unit and the needle advancing and retreating button are electrically connected through a wire. The prostate focus tissue is rapidly heated to about 150 DEG C through microwave energy, thermal coagulation and necrosis of the focus tissue are achieved, the method has the advantages of being rapid in effect taking and low in recurrence rate, meanwhile, water molecules are gasified through high temperature, the ablation process is conveniently monitored in real time through ultrasonic images, and compared with the prior art, the diameter is obviously reduced, and implementation of a soft needle is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a prostate microwave ablation device. Background Art

[0002] Prostate diseases, such as benign prostatic hyperplasia (BPH) and prostate cancer, are common urinary system diseases in middle-aged and elderly men. Traditional treatments include medication and surgery, but medication can only alleviate symptoms and cannot cure the disease, while surgery carries risks such as severe trauma and multiple complications. In recent years, minimally invasive treatment technologies have gradually emerged, among which ablation technology has been widely used in the treatment of prostate diseases due to its advantages such as minimal trauma and rapid recovery. However, existing prostate ablation mainly relies on thermal steam ablation, which has the following problems in the process of prostate ablation: During thermal steam ablation, the steam temperature output from the front end is generally 103°C. When this high-temperature steam is injected into the prostate tissue, the surrounding prostate tissue temperature reaches 70°C, causing instant necrosis of prostate hyperplasia cells. Because the actual tissue temperature is below 100°C, water molecules cannot be vaporized, and ultrasound imaging equipment cannot fully and immediately observe the ablation effect. As a result, medical staff cannot evaluate the ablation results in real time and can only rely on the doctor's experience. 2. The onset of thermal steam ablation is relatively long, generally starting two weeks after the procedure, and the maximum therapeutic effect may take two to three months to fully manifest. 3. The low temperature of thermal steam ablation has a poor way and degree of damage to prostate tissue. Since it takes a long time to take effect and its efficacy is affected by many factors, such as the reaction of prostate tissue to thermal steam, the stability of the treatment effect is relatively poor and the postoperative recurrence rate is relatively high.

[0003] Based on the above problems, the present application proposes a prostate microwave ablation device to improve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a prostate microwave ablation device, which uses microwave energy to quickly heat the prostate lesion tissue to about 150°C, so that the lesion tissue can be thermally coagulated and necrotized. It has the characteristics of rapid onset and low recurrence rate. At the same time, the high temperature vaporizes water molecules, making it convenient to monitor the ablation process in real time through ultrasound imaging. Compared with the existing technology, the diameter is significantly reduced, which is conducive to the realization of soft needles.

[0005] The technical solutions adopted by the present invention are as follows: A prostate microwave ablation device comprises a handle, an outer catheter fixed to one end of the handle, an ablation lumen and an irrigation lumen defined within the outer catheter, a needle exit hole defined at an end of the outer catheter remote from the handle, the ablation lumen and the needle exit hole, as well as the irrigation lumen and the needle exit hole, being interconnected, a coil drive unit mounted on an end of the handle proximal to the outer catheter, a needle advance / retraction button mounted on the upper end of the handle, the coil drive unit and the needle advance / retraction button being electrically connected via a wire, and further comprising: An ablation catheter assembly, the ablation catheter assembly being mounted inside an ablation cavity and connected to a coil drive unit, the ablation catheter assembly comprising a puncture catheter and an ablation antenna unit, the puncture catheter being slidably connected to the inside of the ablation cavity and connected to the coil drive unit, the puncture catheter being provided with a puncture blade at one end away from the handle, and the ablation antenna unit being mounted inside the puncture catheter; The coil driving unit is configured to drive the ablation catheter assembly to perform a needle removal or retraction action, and the ablation antenna unit is configured to release a spherical microwave ablation energy field.

[0006] In a preferred embodiment, the ablation antenna unit includes an antenna inner conductor and a metal head, the antenna inner conductor is fixed inside the puncture catheter, the metal head is fixed to the end of the antenna inner conductor close to the puncture blade, a first insulating layer and a second insulating layer are fixed to the outside of the antenna inner conductor, and the first insulating layer is located at the end of the second insulating layer close to the metal head, a first metal layer is fixed between the first insulating layer and the second insulating layer, and an air cavity is formed between the first metal layer and the antenna inner conductor.

[0007] In a preferred embodiment, a second metal layer is fixed to the outer side of the first insulating layer, and a third metal layer is fixed to the outer side of the second insulating layer.

[0008] In a preferred embodiment, the cross-sectional shape of the first metal layer is T-shaped, the end of the third metal layer close to the metal head extends to the outside of the first insulating layer, and the first insulating layer and the third metal layer as well as the first metal layer and the third metal layer are fixedly connected.

[0009] In a preferred embodiment, the length of the metal head is recorded as L1, the distance between the metal head and the second metal layer is recorded as L2, the length of the second metal layer is recorded as L3, the distance between the second metal layer and the third metal layer is recorded as L4, the distance between the end of the first metal layer close to the metal head and the end of the third metal layer close to the metal head is recorded as L5, and the distance between the end of the first metal layer away from the metal head and the end of the third metal layer close to the metal head is recorded as L6. The value range of L1 is 0.8~1.2, the value range of L2 is 0.5~1, the value range of L3 is 1~1.2, the value range of L4 is 0.8~1.2, the value range of L5 is 1.6~2, and the value range of L6 is 1.8~2.2.

[0010] In a preferred embodiment, the puncture catheter is made of any one of the following materials: PTFE, FEP, PI, PEEK or other polymer materials.

[0011] In a preferred embodiment, the shape of the puncture edge is one of the following forms: conical, bevel, triangular or other needle shapes with puncture function.

[0012] In a preferred embodiment, a cooling tube is fixed inside the puncture catheter and outside the third metal layer. The puncture catheter and the cooling tube, as well as the third metal layer and the cooling tube, are all clearance-fitted. A cooling channel is formed between the cooling tube and the third metal layer. A reflux channel is formed between the puncture catheter and the cooling tube, and the cooling channel and the reflux channel are interconnected.

[0013] In a preferred embodiment, a temperature sensor is fixed to one end of the puncture catheter near the puncture edge.

[0014] The technical effects achieved by the present invention are: In this invention, after the ablation catheter assembly is precisely inserted into the prostate lesion under the guidance of ultrasound imaging and equipment, microwave energy causes polar molecules such as water molecules in the tissue to move at high speed and rub against each other to generate heat, thereby rapidly raising the tissue temperature to around 150°C. This can effectively achieve thermal coagulation and necrosis of the prostate lesion tissue with a relatively fast onset. At the same time, the high temperature can quickly and completely vaporize the water molecules, allowing the ablation area to be observed in real time through ultrasound imaging equipment. The present invention uses microwave ablation to ablate prostate lesions. By precisely controlling the transmission and distribution of microwave energy, it can more effectively destroy prostate lesions, thereby reducing the postoperative recurrence rate. At the same time, by delivering physiological saline to the bladder through a flushing water tank, it can avoid unnecessary damage to surrounding normal tissues caused by high temperatures, thereby improving the safety of treatment. The present invention uses a specifically structured ablation antenna unit to provide the ablation antenna unit with impedance-matching non-periodic interstitial characteristics, achieving impedance matching at the ISM-specified frequency of 4.5 GHz, with energy concentrated at the tip of the antenna. The ablation area is approximately spherical, avoiding unnecessary ablation of healthy tissue. In addition, compared with existing choke coils, floating metal sleeves, and balun antennas, the diameter is significantly reduced, making it more conducive to the implementation of soft needles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 It is a schematic diagram of the mechanism inside the handle of the present invention; Figure 3 It is a partial structural cross-sectional view of the outer catheter of the present invention; Figure 4 is a partial structural cross-sectional view of the ablation catheter assembly of the present invention; Figure 5 It is a schematic diagram of the partial structure of the ablation antenna unit of the present invention; Figure 6 This is a structural cross-sectional view of the ablation catheter assembly of the present invention in a needle-retracted state; Figure 7 This is a schematic diagram of SAR simulation of the device of the present invention; Figure 8 This is a schematic diagram of thermal field simulation of the device of the present invention; Figure 9 It is a schematic diagram of the ablation effect of the device of the present invention on ex vivo tissue.

[0016] In the accompanying drawings, the components represented by the reference numerals are as follows: 100, handle; 110, outer catheter; 111, ablation channel; 112, irrigation channel; 113, needle exit hole; 120. Coil drive unit; 121. Needle advance and retract button; 130. Cooling water tank; 140. Flush the water tank; 141. Flush the water inlet pipe; 142. Flush the water outlet pipe; 150. Flushing start / stop button; 151. Ablation start / stop button; 200, ablation catheter assembly; 210, puncture catheter; 211, puncture blade; 212, cooling tube; 213, temperature sensor; 220, ablation antenna unit; 221. Antenna inner conductor; 222. Metal head; 223. First insulating layer; 224. Second insulating layer; 225. First metal layer; 226. Air cavity; 227. Second metal layer; 228. Third metal layer. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive of other embodiments.

[0020] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0021] Example 1 Please see the attached Figures 1 to 3 As shown, the first embodiment of the present invention provides a prostate microwave ablation device, including a handle 100, an outer catheter 110 is fixed to one end of the handle 100, an ablation cavity 111 and an irrigation cavity 112 are provided inside the outer catheter 110, an end of the outer catheter 110 away from the handle 100 is provided with a needle hole 113, and the ablation cavity 111 and the needle hole 113, as well as the irrigation cavity 112 and the needle hole 113 are interconnected, an arc-shaped guide surface is provided at the end of the outer catheter 110 away from the handle 100, and the arc-shaped guide surface is adapted to the needle hole 113, a coil drive unit 120 is installed at the end of the handle 100 close to the outer catheter 110, and a needle advance and retreat button 121 is installed at the upper end of the handle 100, and the coil drive unit 120 and the needle advance and retreat button 121 are electrically connected via a wire, and further comprising: The ablation catheter assembly 200 is assembled inside the ablation cavity 111 and connected to the coil drive unit 120. The ablation catheter assembly 200 includes a puncture catheter 210 and an ablation antenna unit 220. The puncture catheter 210 is slidably connected to the inside of the ablation cavity 111 and connected to the coil drive unit 120. A puncture blade 211 is defined at the end of the puncture catheter 210 away from the handle 100. The ablation antenna unit 220 is assembled inside the puncture catheter 210. The flushing channel 112 is configured to be used for conveying an endoscope or other imaging equipment, and the coil driving unit 120 is configured to be able to drive the ablation catheter assembly 200 to perform a needle withdrawal or needle removal action (i.e., the coil driving unit 120 drives the ablation catheter assembly 200 to move or retract to the outside of the ablation channel 111, such as Figure 3 and Figure 6 As shown), the ablation antenna unit 220 is configured to release a spherical microwave ablation energy field and quickly vaporize water molecules in the microwave ablation energy field. In the initial state, the ablation catheter assembly 200 is completely located inside the ablation cavity 111.

[0022] Here, the device is also used in conjunction with a microwave ablation device and an ultrasonic imaging device. The microwave ablation device is connected to the ablation antenna unit 220. The microwave ablation device can transmit microwaves to the ablation antenna unit 220, so that the ablation antenna unit 220 releases a microwave ablation energy field. The ultrasonic imaging device can obtain information such as the size and location of the prostate hyperplasia site. Specifically, the endoscope, microwave ablation device and ultrasonic imaging equipment are all existing mature technologies. Please refer to the existing technology for their specific working principles. No further elaboration will be made here.

[0023] Furthermore, the coil drive unit 120 is provided with a driving permanent magnet and a coil inside. When the coil is energized, a magnetic field is generated. By adjusting the direction of the current, the permanent magnet and the ablation catheter assembly 200 are driven to move forward and backward. The coil drive unit 120 is an existing mature application. For its specific working process, please refer to the existing technology.

[0024] In this embodiment, under the guidance of the ultrasound imaging device, the handle 100 is held to insert the outer catheter 110 into the vicinity of the prostate hyperplasia site (hereinafter referred to as the lesion tissue), and the coil drive unit 120 is started by the needle advance and retreat button 121. The ablation catheter assembly 200 is driven by the coil drive unit 120 to pass through the inside of the needle hole 113 and move to the outside of the ablation cavity 111, so that the ablation catheter assembly 200 penetrates the lesion tissue, and the puncture status of the ablation catheter assembly 200 (such as: puncture depth, whether the puncture is deviated, etc.) is observed through the endoscope, and the microwave ablation instrument is started to transmit microwaves to the ablation antenna unit 220, so that the ablation antenna unit 220 is away from the handle 100. The end releases a microwave ablation energy field. The microwave energy causes polar molecules such as water molecules in the tissue to move at high speed and rub against each other to generate heat, thereby rapidly increasing the temperature of the tissue to about 150°C, achieving the effect of thermal coagulation and necrosis, and taking effect quickly. At the same time, during the microwave ablation process, water molecules are vaporized, and the ablation area is observed in real time through ultrasonic imaging equipment until the ablation is completed. The microwave ablation instrument is turned off, and the coil drive unit 120 is started through the needle advance and retreat button 121, so that the coil drive unit 120 runs in reverse and drives the handle 100 and drives the ablation catheter assembly 200 back to the inside of the ablation cavity 111. The handle 100 is held to remove the outer catheter 110 from the patient's body.

[0025] Next, please refer to Figure 4 and Figure 5 The ablation antenna unit 220 includes an antenna inner conductor 221 and a metal head 222. The antenna inner conductor 221 is fixed inside the puncture catheter 210. The metal head 222 is fixed to one end of the antenna inner conductor 221 close to the puncture blade 211. A first insulating layer 223 and a second insulating layer 224 are fixed to the outside of the antenna inner conductor 221. The first insulating layer 223 is located at one end of the second insulating layer 224 close to the metal head 222. The first metal layer 223 is fixed between the first insulating layer 223 and the second insulating layer 224. 5, and an air cavity 226 is formed between the first metal layer 225 and the antenna inner conductor 221, the cross-sectional shape of the first metal layer 225 is T-shaped, the end of the third metal layer 228 close to the metal head 222 extends to the outside of the first insulating layer 223, and the first insulating layer 223 and the third metal layer 228, as well as the first metal layer 225 and the third metal layer 228, are fixedly connected, the second metal layer 227 is fixed to the outside of the first insulating layer 223, and the third metal layer 228 is fixed to the outside of the second insulating layer 224.

[0026] The first metal layer 225 , the second metal layer 227 and the third metal layer 228 together constitute a balun structure.

[0027] In this embodiment, after the device reaches the diseased tissue, the microwave ablation device is started, and the microwave energy is transmitted to the metal head 222 through the inner conductor 221 of the antenna, so that a microwave ablation energy field is formed around the metal head 222, thereby ablating the diseased tissue. During the ablation process, the setting of the balun structure is intended to adjust the impedance matching of different sections to reduce energy reflection and loss, thereby improving the utilization efficiency of microwave energy. In addition, it can also optimize the standing wave ratio of the metal head 222, enhance the electromagnetic interference shielding effect, and suppress the propagation of reverse electromagnetic waves, ensuring that the ablation area around the metal head 222 remains circular, avoiding the tailing phenomenon in the ablation area. At the same time, the setting of the air cavity 226 can prevent the air cavity 226 from direct contact with the inner conductor 221 of the antenna, playing a role similar to insulation, and this design is similar to a gap antenna, which can effectively radiate microwaves and play a role of focusing energy, which not only improves the utilization efficiency of microwave energy, but also effectively avoids the tailing phenomenon in the ablation area.

[0028] Please refer again Figures 4 to 5 The length of the metal head 222 is recorded as L1, the distance between the metal head 222 and the second metal layer 227 is recorded as L2, the length of the second metal layer 227 is recorded as L3, the distance between the second metal layer 227 and the third metal layer 228 is recorded as L4, the distance between the end of the first metal layer 225 close to the metal head 222 and the end of the third metal layer 228 close to the metal head 222 is recorded as L5, and the distance between the end of the first metal layer 225 away from the metal head 222 and the end of the third metal layer 228 close to the metal head 222 is recorded as L6. The value range of L1 is 0.8~1.2, the value range of L2 is 0.5~1, the value range of L3 is 1~1.2, the value range of L4 is 0.8~1.2, the value range of L5 is 1.6~2, and the value range of L6 is 1.8~2.2.

[0029] It should be noted that, in this embodiment, the value of L1 is 1, the value of L2 is 0.8, the value of L3 is 1.1, the value of L4 is 1, the value of L5 is 1.8, the value of L6 is 1.9, and the length of the first metal layer 225 and the air cavity 226 are both 3.7 (i.e., the sum of L5 and L6).

[0030] In this implementation, see Figures 7 to 9As shown, due to the dielectric constant of the specific tissue of the prostate (the dielectric constant of the prostate tissue at a frequency of 2.45 GHz is 50-60), the microwave ablation antenna structure of the above structure has the characteristics of impedance matching non-periodic interstitial, which can achieve impedance matching at the frequency of 4.5 GHz specified by the ISM, and the energy is concentrated around the metal head 222. The ablation area is approximately spherical, avoiding unnecessary ablation of healthy tissue. In addition, the structural form of the above microwave ablation antenna is significantly reduced in diameter compared with the choke, floating metal sleeve, and balun antenna in the prior art, which is more conducive to the realization of soft needles, and this scheme can achieve impedance matching to a certain extent without the need to include a matching network. The matching network has many problems in size, realization and loss. At the same time, in the process of ablation of the diseased tissue, as the ablation time goes by, the spherical heating mode can remain unchanged while the ablation area expands.

[0031] For further information, see Figures 7 to 9 As shown, the SAR distribution map and thermal field map (such as Figure 7 and Figure 8 As shown in the figure, it can be clearly seen that the ablation pattern of prostate tissue using the impedance-matched non-periodic interstitial microwave ablation antenna is spherical in orientation. The suppression effect along the axis of the needle shaft is better in this embodiment, and the SAR distribution along the edge of the needle shaft is obviously suppressed more thoroughly. At the same time, during the ablation process of the ex vivo tissue (such as Figure 9 As shown in the figure, it can be seen that the ablation area is quasi-circular and there is no tailing phenomenon.

[0032] In a preferred embodiment, the material of the puncture catheter 210 is any one of the following materials: PTFE, FEP, PI, PEEK or other polymer materials. In this embodiment, the material of the puncture catheter 210 is PEEK.

[0033] In a preferred embodiment, the shape of the puncture edge 211 is one of the following forms: conical, beveled, triangular or other needle shapes with puncture function. In this embodiment, the shape of the puncture edge 211 is preferably conical.

[0034] Please refer again Figure 4A cooling tube 212 is fixed inside the puncture catheter 210 and on the outside of the third metal layer 228. The puncture catheter 210 and the cooling tube 212, as well as the third metal layer 228 and the cooling tube 212 are all clearance-fitted. A cooling channel is formed between the cooling tube 212 and the third metal layer 228. A reflux channel is formed between the puncture catheter 210 and the cooling tube 212, and the cooling channel and the reflux channel are interconnected. A temperature sensor 213 is fixed at one end of the puncture catheter 210 near the puncture blade 211, and the temperature sensor 213 and the microwave ablation instrument are electrically connected through a wire. A cooling water tank 130 and a flushing water tank 140 are also provided inside the handle 100. The interior of the cooling water tank 130 is divided into a cooling water inlet tank and a cooling water outlet tank, and the cooling water inlet tank and the cooling channel, as well as the cooling water outlet tank and the reflux channel are interconnected. The flushing water The interior of the box 140 is divided into a flushing water inlet tank and a flushing water outlet tank, and the flushing water inlet tank and the flushing cavity 112, as well as the flushing water outlet tank and the flushing cavity 112 are interconnected. A flushing water inlet pipe 141 and a flushing water outlet pipe 142 are fixed on the flushing water tank 140, and the flushing water inlet pipe 141 and the flushing water inlet tank, as well as the flushing water outlet pipe 142 and the flushing water outlet tank are adapted to each other. The lower end of the outer side of the handle 100 is also equipped with a flushing start-stop button 150 and an ablation start-stop button 151, and the temperature sensor 213 and the microwave ablation device, the flushing start-stop button 150 and the flushing water tank 140, and the ablation start-stop button 151 and the microwave ablation device are all electrically connected through wires. The flushing start-stop button 150 can control the opening and closing of the flushing water tank 140, and the ablation start-stop button 151 can control the microwave ablation device to transmit or stop microwaves to the metal head 222.

[0035] It should be noted that the device is also equipped with a liquid storage tank and a waste water tank. Physiological saline is stored in the liquid storage tank, and the cooling water inlet tank and the microwave ablation device, the cooling water outlet tank and the microwave ablation device, the flushing water inlet pipe 141 and the microwave ablation device, the flushing water outlet pipe 142 and the microwave ablation device, the liquid storage tank and the microwave ablation device, and the waste water tank and the microwave ablation device are all interconnected. After the microwave ablation device is started, while transmitting microwaves to the metal head 222 through the antenna inner conductor 221, the physiological saline in the liquid storage tank can also be independently transported to the cooling water inlet tank and the flushing water inlet pipe 141, wherein the flow of physiological saline in the cooling channel and the ablation process are carried out simultaneously.

[0036] In this embodiment, the temperature sensor 213 is provided to monitor the temperature of the microwave ablation energy field. The transmission and distribution of microwave energy can be accurately controlled according to the real-time temperature monitored by the temperature sensor 213, which can more effectively destroy the prostate lesion tissue, thereby reducing the postoperative recurrence rate. At the same time, during the process of microwave ablation of the diseased tissue, the normal saline in the liquid storage tank is driven by the microwave ablation instrument to flow through the cooling water inlet tank, the cooling channel, the reflux channel, the cooling water outlet tank in sequence, and finally flows to the waste water tank. When the normal saline flows through the cooling channel, the ablation antenna unit 220 is cooled so as to regulate the temperature of the ablation antenna unit 220, thereby avoiding unnecessary damage to the surrounding normal tissues caused by high temperature, and improving the safety of treatment. When it is necessary to flush the endoscope, the microwave ablation instrument drives the saline solution inside the liquid storage tank to flow through the flushing water inlet pipe 141, the flushing cavity 112, and the needle hole 113 in sequence to enter the patient's urethra. During the above process, the saline solution can flush the lens of the endoscope inside the flushing cavity 112 to prevent the endoscope lens from being contaminated by body fluids, resulting in the inability to collect images. At the same time, it can also cool the urethra wall in the patient's body to prevent thermal damage to the urethra during the ablation process; when there is a lot of saline solution in the patient's bladder, the internal pressure is relatively high, and the microwave ablation instrument is used to extract the saline solution inside the bladder. The saline solution in the bladder flows through the needle hole 113, the flushing cavity 112, and the flushing water outlet pipe 142 to the inside of the waste liquid tank in sequence to reduce the pressure inside the patient's bladder.

[0037] Example 2 This embodiment provides a method for using a prostate microwave ablation device, which is applicable to the prostate microwave ablation device in Example 1 and includes the following steps: Step 1: Determine ablation parameters (such as microwave power and time) based on the size of the lesion tissue measured by ultrasound imaging equipment; Step 2: Hold the handle 100 and accurately insert the outer catheter 110 near the prostate lesion site. Activate the needle advance and retract button 121 to withdraw the ablation catheter assembly 200 and allow the ablation catheter assembly 200 to penetrate the lesion tissue. Observe the penetration status through the endoscope inside the flushing cavity 112. Step 3: Activate the flushing start / stop button 150 to circulate the saline solution to cool the ablation antenna unit 220; Step 4: Start the microwave ablation device to ablate the diseased tissue, and monitor the ablation temperature in real time through the temperature sensor 213; Step 5: Observe the ablation status of the lesion tissue in real time through ultrasound imaging equipment until the ablation is completed; Step 6: Reversely operate the needle advance and retraction button 121 to retract the ablation catheter assembly 200 , and hold the handle 100 to remove the outer catheter 110 from the patient's body to complete the ablation.

[0038] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A prostate microwave ablation device, characterized by: The invention comprises a handle (100), an outer catheter (110) is fixed to one end of the handle (100), an ablation cavity (111) and a flushing cavity (112) are provided inside the outer catheter (110), a needle hole (113) is provided at one end of the outer catheter (110) away from the handle (100), and the ablation cavity (111) and the needle hole (113) as well as the flushing cavity (112) and the needle hole (113) are communicated with each other, a coil driving unit (120) is provided at one end of the handle (100) close to the outer catheter (110), a needle advance and retreat button (121) is provided at the upper end of the handle (100), and the coil driving unit (120) and the needle advance and retreat button (121) are electrically connected via a wire, and further comprises: An ablation catheter assembly (200), wherein the ablation catheter assembly (200) is assembled inside the ablation cavity (111), and the ablation catheter assembly (200) is connected to the coil drive unit (120), and the ablation catheter assembly (200) includes a puncture catheter (210) and an ablation antenna unit (220), wherein the puncture catheter (210) is slidably connected to the inside of the ablation cavity (111), and the puncture catheter (210) is connected to the coil drive unit (120), and a puncture blade (211) is provided at one end of the puncture catheter (210) away from the handle (100), and the ablation antenna unit (220) is assembled inside the puncture catheter (210); The coil drive unit (120) is configured to be able to drive the ablation catheter assembly (200) to perform a needle removal or needle withdrawal action, and the ablation antenna unit (220) is configured to be able to release a spherical microwave ablation energy field.

2. The prostate microwave ablation device according to claim 1, characterized in that: The ablation antenna unit (220) includes an antenna inner conductor (221) and a metal head (222), wherein the antenna inner conductor (221) is fixed inside the puncture catheter (210), and the metal head (222) is fixed to one end of the antenna inner conductor (221) close to the puncture blade (211). A first insulating layer (223) and a second insulating layer (224) are fixed to the outside of the antenna inner conductor (221), and the first insulating layer (223) is located at one end of the second insulating layer (224) close to the metal head (222). A first metal layer (225) is fixed between the first insulating layer (223) and the second insulating layer (224), and an air cavity (226) is formed between the first metal layer (225) and the antenna inner conductor (221).

3. The prostate microwave ablation device according to claim 2, characterized in that: A second metal layer (227) is fixed to the outside of the first insulating layer (223), and a third metal layer (228) is fixed to the outside of the second insulating layer (224).

4. The prostate microwave ablation device according to claim 3, characterized in that: The cross-section of the first metal layer (225) is T-shaped, one end of the third metal layer (228) close to the metal head (222) extends to the outside of the first insulating layer (223), and the first insulating layer (223) and the third metal layer (228) as well as the first metal layer (225) and the third metal layer (228) are all fixedly connected.

5. The prostate microwave ablation device according to claim 3, characterized in that: The length of the metal head (222) is recorded as L1, the distance between the metal head (222) and the second metal layer (227) is recorded as L2, the length of the second metal layer (227) is recorded as L3, the distance between the second metal layer (227) and the third metal layer (228) is recorded as L4, the distance between the end of the first metal layer (225) close to the metal head (222) and the end of the third metal layer (228) close to the metal head (222) is recorded as L5, and the The distance between the end of the first metal layer (225) away from the metal head (222) and the end of the third metal layer (228) close to the metal head (222) is recorded as L6, the value range of L1 is 0.8 to 1.2, the value range of L2 is 0.5 to 1, the value range of L3 is 1 to 1.2, the value range of L4 is 0.8 to 1.2, the value range of L5 is 1.6 to 2, and the value range of L6 is 1.8 to 2.

2.

6. The prostate microwave ablation device according to claim 1, characterized in that: The material of the puncture catheter (210) is any one of the following materials: PTFE, FEP, PI, PEEK.

7. The prostate microwave ablation device according to claim 1, characterized in that: The shape of the puncture blade (211) is one of the following forms: conical, bevel, or triangular.

8. The prostate microwave ablation device according to claim 3, characterized in that: A cooling tube (212) is fixed inside the puncture catheter (210) and outside the third metal layer (228), a cooling channel is formed between the cooling tube (212) and the third metal layer (228), a reflux channel is formed between the puncture catheter (210) and the cooling tube (212), and the cooling channel and the reflux channel are interconnected.

9. The prostate microwave ablation device according to claim 1, characterized in that: A temperature sensor (213) is fixed to one end of the puncture catheter (210) near the puncture edge (211).

Images