Prostate vapor ablation system and method of using same

Abstract

Provided are a prostate vapor ablation system and a method of using same. The system comprises a guide pipe sheath (12), a handle (1), a vapor generator (7), a vapor conveying needle (13) in communication with the vapor generator (7) and slidably arranged in the guide pipe sheath (12), and a micro servo electric cylinder (9) attached to the vapor conveying needle (13). Saline inlet / outlet ducts (14,15) are arranged in the guide pipe sheath, and are, at one end, in communication with liquid inlet / outlet (22, 23) located at the end of the guide pipe sheath (12) distal to the handle (1) and, at the other end, in communication with normal saline inlet / outlet pipes (2, 3). A guide pipe sheath front camera (17), a guide pipe sheath rear camera (18) aligned with the needle of the vapor conveying needle (13), and an ultrasonic probe module (21) are arranged at the end of the guide pipe sheath (12) distal to the handle (1), and the liquid inlet (22) is aligned with the guide pipe sheath rear camera (18). The prostate vapor ablation system features an integrated design with a high integration degree. The reduced diameter of the guide pipe sheath (12) reduces the surgical burden of a patient. The guide pipe sheath rear camera (18) facilitates the observation in surgeries. Therefore, the present application has good prospects.

Description

A system for prostate steam ablation and its application method Technical Field

[0001] The present invention relates to the technical field of minimally invasive prostate treatment, in particular to a system for prostate steam ablation and an application method thereof, and in particular to a system for treating benign prostatic hyperplasia by using steam delivered to the prostate and an application method thereof. Background Art

[0002] With the continuous improvement of living and medical conditions, people's pursuit of quality of life is also constantly increasing. At this stage, the aging of the population is getting worse and geriatric diseases are becoming increasingly prominent. Among them, benign prostatic hyperplasia is one of the common diseases in elderly men, which seriously affects the quality of life of the elderly.

[0003] According to data released by the National Bureau of Statistics, as of February 2023, the number of people aged 60 and over in China reached 280 million. The incidence of benign prostatic hyperplasia (BPH) among men over 60 is over 60%, with 10% requiring surgical treatment. A conservative estimate puts this at 6 million. BPH, a common aging disease, often presents with coexisting complications such as heart, lung, brain, hypertension, renal insufficiency, or diabetes, requiring high-level anesthesia and perioperative care.

[0004] Early in life, the prostate is the size and shape of a walnut, weighing approximately 20 grams before it becomes enlarged due to BPH (benign prostatic hyperplasia). Prostate enlargement appears to be a normal process. With aging, the prostate gradually increases in size to twice its normal size or more. After the gland reaches a certain size, the fibromuscular tissue of the outer prostatic capsule restricts expansion. This restriction in expansion causes the tissue within the capsule to press against and restrict the prostatic urethra, thereby causing resistance to urine flow.

[0005] In male urogenital anatomy, the prostate gland is located below the bladder and bladder neck. The bladder wall can expand and contract to cause urine to flow through the urethra, which extends from the bladder through the prostate and penis. The portion of the urethra surrounded by the prostate gland is called the prostatic urethra. The prostate also surrounds the ejaculatory ducts, which have an open terminal end in the prostatic urethra. During sexual arousal, the vas deferens transports sperm from the testicles to the prostate, and the prostate provides fluid that combines with sperm to form semen during ejaculation. The vas deferens and the seminal vesicles connect on each side of the prostate to form a single tube called the ejaculatory duct. Therefore, each ejaculatory duct transports seminal vesicle secretions and sperm into the prostatic urethra.

[0006] The prostate glandular structure can be divided into three zones: the peripheral zone, the transition zone, and the central zone. The peripheral zone (PZ) encompasses approximately 70% of the prostate volume in young men. This subcapsular portion of the prostate gland, located posteriorly, surrounds the distal urethra, and 70-80% of cancers originate in the peripheral zone tissue. The central zone (CZ) surrounds the ejaculatory ducts and encompasses approximately 20-25% of the prostate volume. The central zone is often the site of inflammatory processes. The transition zone (TZ) is where benign prostatic hyperplasia (BPH) develops. In a normal prostate, it comprises approximately 5-10% of the glandular volume, but in cases of BPH, it can comprise up to 80%. The transition zone encompasses the two lateral prostate lobes and the periurethral glandular area. A natural barrier surrounds the transition zone: the prostatic urethra, the anterior fibromuscular stroma, and a fibrous plane between the transition zone and the peripheral zone. The anterior fibromuscular stroma or fibromuscular zone is primarily composed of fibromuscular tissue.

[0007] BPH is usually diagnosed when patients complain about troublesome dysuria and seek drug treatment. The cardinal symptoms of BPH are frequent urination and urgency, as well as a significant decline in flow rate during urination. BPH may also cause urine to be retained in the bladder, which may then cause lower urinary tract infection (LUTI). In many cases, LUTI may then rise in the kidneys and cause chronic pyelonephritis, which may eventually lead to renal insufficiency. BPH may also cause the sexual dysfunction related to the sleep disorder or psychological anxiety caused by severe dysuria. Therefore, along with the growth of male population age, BPH may significantly change the quality of life.

[0008] BPH is the result of an imbalance between the continuous production and natural death (apoptosis) of glandular cells in the prostate. The overproduction of these cells causes the prostate to increase in size, most notably in the transition zone that traverses the prostatic urethra.

[0009] In the early stages of BPH, medication can relieve some symptoms. For example, alpha-blockers treat BPH by relaxing the smooth muscle tissue found in the prostate and bladder neck, which allows urine to flow more easily out of the bladder. These medications can be effective before glandular elements cause excessive cell growth in the prostate.

[0010] However, the late stages of BPH can only be treated with surgery or minimally invasive thermal elimination devices. Various methods have been developed that utilize electrosurgery or mechanical tissue aspiration (extraction) and thermal elimination or cryoablation of intracapsular prostate tissue. In many cases, such interventions provide only temporary relief, and these treatments typically result in significant pre- and post-operative discomfort and morbidity.

[0011] Current thermal steam therapy devices use pulsed energy to heat sterile distilled water to 103°C. This water is then injected into the hyperplastic prostate tissue via a disposable prostate thermal steam therapy device. The hot steam releases heat energy through intercellular convection and diffusion, raising the temperature of the tissue in the treatment area by approximately 70°C over 9 seconds. This causes cell membrane degeneration and cell death. Necrotic tissue is then absorbed by the body, reducing the size of the prostate tissue near the urethra and alleviating LUTS. Furthermore, the thermal energy causes blood vessels in the treatment area to collapse, ensuring minimal bleeding during the procedure.

[0012] The existing steam thermal ablation device Rezum on the market (i.e., the steam elimination system disclosed in CN 113855214 A and the system for prostate treatment disclosed in CN105816237A) needs to be used with a cystoscope with a 4mm / 30° / 30cm lens. The cystoscope requires a light source and image display device, and has many cables connecting to external devices. Before steam delivery and release, the front needle needs to be punctured deeply into the prostate tissue. The current steam thermal ablation device Rezum uses a magnetic device to provide needle movement power, which cannot effectively determine whether the needle has punctured the correct location. In addition, during prostate ablation surgery, in order to maintain a clear surgical observation field of view, the urethra needs to be flushed with sterile saline from time to time. Due to structural limitations, the current steam thermal ablation device Rezum shares a single channel with the endoscope and sterile saline flushing, which cannot well meet surgical requirements.

[0013] Therefore, it is of great practical significance to develop a prostate steam ablation system with reasonable design and more convenient operation. Technical issues

[0014] The present invention provides a prostate steam ablation system with a reasonable design and more convenient operation, which solves the defects of existing steam thermal ablation equipment, such as the need for a cystoscope, inconvenience in observation and many inconveniences in surgery. Technical Solutions

[0015] In order to achieve the above object, the present invention provides the following technical solutions:

[0016] A system for prostate steam ablation, comprising an introducer sheath for entering a patient's body through the urethra, a handle coupled to the introducer sheath, a steam generator disposed in the handle and configured to generate condensable steam, a steam delivery needle in communication with the steam generator and slidably disposed within the introducer sheath, and a micro servo cylinder attached to the steam delivery needle and configured to drive the steam delivery needle;

[0017] The guide tube sheath is further provided with a saline inlet channel and a saline outlet channel. One end of the saline inlet channel is connected to the liquid inlet located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline inlet tube. The saline outlet channel is connected to the discharge port located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline outlet tube.

[0018] The guide tube sheath is equipped with a front camera aimed at the front end of the guide tube sheath, a rear camera aimed at the needle head of the steam delivery needle, and an ultrasound probe module at the end of the guide tube sheath away from the handle, and the liquid inlet is aimed at the rear camera of the guide tube sheath.

[0019] The steam generator vaporizes the sterile distilled water, and the sterile distilled water is fed in by the host peristaltic pump, which is connected to the sterile distilled water bag.

[0020] Compared with the existing technology, the prostate steam ablation system provided by the present invention has the following advantages:

[0021] (1) It adopts an integrated design, which does not require a separate cystoscope. Two cameras (front camera and rear camera) are set on the guide sheath. The rear camera of the guide sheath is aimed at the needle tip of the steam delivery needle to observe the firing and withdrawal of the delivery needle and the treatment site, which is convenient for the operator to perform the surgical operation;

[0022] (2) The added ultrasound probe module can not only assist in locating the puncture needle, but also determine the surgical effect through the ultrasound probe during the operation;

[0023] (3) The steam delivery needle is driven by a micro-servo electric cylinder. Compared with the magnetic drive parts in the existing technology, it not only has high stroke accuracy (delivery stroke accuracy reaches ±0.03mm), but also the force sensor embedded in the micro-servo electric cylinder can feedback the puncture force to the micro-servo electric cylinder. The micro-servo electric cylinder will control the steam delivery needle according to the puncture force. This can avoid the steam delivery needle puncturing the cyst wall and causing serious harm to the patient during the operation to the greatest extent. Compared with the current reliance on the experience of the surgeon to judge the puncture depth of the steam delivery needle, its reliability is good, which adds a safety guarantee for the patient's surgical safety.

[0024] (4) Compared with the existing technology where the endoscope and the flushing channel share the same channel, the dedicated saline inlet and outlet channels set in the guide sheath facilitate flushing and clearing the field of view during surgery. The existence of the dedicated channel can avoid contamination;

[0025] (5) Integrating the steam delivery needle, the saline inlet channel in the guide sheath, and the saline outlet channel in the guide sheath can reduce the diameter of the guide sheath (to 6 mm), thereby reducing the surgical burden on patients.

[0026] As the preferred technical solution:

[0027] In the above-mentioned system for prostate steam ablation, the saline inlet channel and the saline outlet channel in the guide sheath are connected to the saline inlet pipe and the saline outlet pipe respectively through a water divider;

[0028] The front camera of the guide sheath is installed at the end of the guide sheath away from the handle end.

[0029] In the above-mentioned system for prostate steam ablation, the saline inlet tube and the saline outlet tube extend from the bottom of the handle;

[0030] The free end of the physiological saline inlet pipe is equipped with a physiological saline inlet pipe Luer connector, and the free end of the physiological saline outlet pipe is equipped with a physiological saline outlet pipe Luer connector. Quick connection of pipelines can be achieved through the Luer connector.

[0031] In the prostate steam ablation system as described above, the steam generator is connected to a sterile distilled water inlet tube away from the steam delivery needle end, and the sterile distilled water inlet tube passes through the bottom of the handle.

[0032] In the prostate steam ablation system as described above, the guide sheath is fixed to the handle via a knob and the guide sheath can rotate around the handle.

[0033] As described above, in a system for prostate steam ablation, the guide tube sheath is further provided with an intra-guide tube sheath video / ultrasound signal cable channel, and the intra-guide tube sheath video / ultrasound signal cable channel is provided with a video / ultrasound signal cable for connecting the guide tube sheath rear camera, the guide tube sheath front camera and the ultrasound probe module. The video / ultrasound signal cable passes through the handle and then exits from the bottom of the handle.

[0034] In the above-mentioned system for prostate steam ablation, the control cable is inserted into the handle from the bottom thereof and then connected to the steam generator and the micro servo cylinder respectively;

[0035] The micro servo electric cylinder has a built-in force sensor, which can provide timely feedback on the puncture force to minimize puncture of the cyst wall.

[0036] The steam generator is a pulse heater, which converts electrical energy into thermal energy to heat the sterile distilled water and convert it into sterile distilled water steam.

[0037] In the prostate steam ablation system as described above, the handle is provided with a firing button for controlling the steam generator and the micro servo electric cylinder.

[0038] The present invention also provides an application method of the prostate steam ablation system as described above, comprising the following steps:

[0039] (1) The guide sheath of the prostate steam ablation system is inserted into the patient through the urethra to reach the patient's prostate. During the insertion process, the current position of the guide sheath can be determined by the front camera of the guide sheath;

[0040] (2) The system that controls prostate steam ablation delivers steam into the prostate through the steam delivery needle. During steam delivery, the state of the steam delivery needle tip can be obtained through the rear camera of the guide sheath and the state of the patient's treatment area can be observed. During the operation, the surgical site and the rear camera of the guide sheath are flushed through the saline inlet tube.

[0041] As the preferred technical solution:

[0042] The application method as described above further comprises:

[0043] (3) After the operation is completed, the steam delivery needle is withdrawn and the steam generator is turned off, and the guide sheath is removed from the prostate through the urethra.

[0044] The above technical solution is only a feasible technical solution of the present invention. The protection scope of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs. Beneficial effects

[0045] The above invention has the following advantages or beneficial effects:

[0046] (1) The prostate steam ablation system of the present invention has a reasonable structural design and does not require a separate cystoscope. The overall design is one-piece, and the guide sheath is provided with a guide sheath front camera and a guide sheath rear camera. The guide sheath front camera can be used to observe the urethral tissue environment in real time, and the guide sheath rear camera can observe the firing and withdrawal of the delivery needle, and can also observe the treatment site;

[0047] (2) The prostate steam ablation system of the present invention includes an ultrasound probe module on the guide sheath, which not only assists in locating the puncture needle, but also enables the ultrasound probe to determine the surgical effect during the operation;

[0048] (3) In the prostate steam ablation system of the present invention, the steam delivery needle is driven by a micro servo electric cylinder. Compared with magnetic drive components, its stroke accuracy is high, which can minimize the risk of puncturing the cyst wall.

[0049] (4) The prostate steam ablation system of the present invention has a guide sheath with a dedicated inlet and outlet channel for saline solution, which facilitates flushing and clearing the visual field during surgery. The presence of the dedicated channel can avoid contamination and facilitate surgical operations;

[0050] (5) The prostate steam ablation system of the present invention integrates the steam delivery needle, the saline inlet channel in the guide sheath, and the saline outlet channel in the guide sheath, which can reduce the diameter of the guide sheath and thus reduce the surgical burden on the patient, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention and its features, configurations, and advantages will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings. Like reference numerals indicate like parts throughout the drawings. The drawings are not drawn to scale, emphasis instead being placed on illustrating the subject matter of the present invention.

[0052] FIG1 is a perspective view of a system for prostate steam ablation according to the present invention;

[0053] FIG2 is a schematic cross-sectional view of a guide sheath;

[0054] FIG3 is a schematic diagram of the end of the guide sheath;

[0055] FIG4 is a front perspective view of a system for prostate steam ablation according to the present invention;

[0056] FIG5 is a schematic diagram of the prostate steam ablation system of the present invention without the handle and housing;

[0057] Among them, 1 is the handle, 2 is the saline inlet tube, 3 is the saline outlet tube, 4 is the sterile distilled water inlet tube, 5 is the video / ultrasound signal cable, 6 is the control cable, 7 is the steam generator, 8 is the water distributor, 9 is the micro servo cylinder, 10 is the knob, 11 is the firing button, 12 is the guide sheath, 13 is the steam delivery needle, 14 is the saline inlet channel in the guide sheath, 15 is the saline outlet channel in the guide sheath, 16 is the video / ultrasound signal cable channel in the guide sheath, 17 is the front camera of the guide sheath, 18 is the rear camera of the guide sheath, 19 is the Luer connector of the saline inlet tube, 20 is the Luer connector of the saline outlet tube, 21 is the ultrasound probe module, 22 is the liquid inlet, and 23 is the liquid outlet. Modes for Carrying Out the Invention

[0058] The structure of the present invention is further described below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. Example

[0059] A system for prostate steam ablation, as shown in Figures 1 to 4, includes a guide sheath 12 for entering a patient's body through the urethra, a handle 1 coupled to the guide sheath 12 (the guide sheath 12 is fixed to the handle 1 via a knob 10 and the guide sheath 12 is rotatable around the handle 1), a steam generator 7 (pulse heater) disposed in the handle 1 and configured to generate condensable steam, a steam delivery needle 13 in communication with the steam generator 7 and slidably disposed within the guide sheath 12, and a micro servo cylinder 9 attached to the steam delivery needle 13 and configured to drive the steam delivery needle 13;

[0060] The end of the steam generator 7 away from the steam delivery needle 13 is connected to a sterile distilled water inlet pipe 4, which passes through the bottom of the handle 1. The control cable 6 passes through the handle 1 from the bottom of the handle and is respectively connected to the steam generator 7 and the micro servo cylinder 9. The micro servo cylinder 9 has a built-in force sensor. The handle 1 is provided with a firing button 11 for controlling the steam generator 7 and the micro servo cylinder 9.

[0061] The guide tube sheath 12 is further provided with a saline inlet channel 14, a saline outlet channel 15 and a video / ultrasound signal cable channel 16 in the guide tube sheath. One end of the saline inlet channel 14 in the guide tube sheath is connected to the liquid inlet 22 located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline inlet tube 2. The saline outlet channel 15 in the guide tube sheath is connected to the drain port 23 located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline outlet tube 3. The physiological saline inlet tube 2 and the physiological saline outlet tube 3 pass through the bottom of the handle 1. A physiological saline inlet tube Luer connector 19 is installed at the free end, and a physiological saline outlet tube Luer connector 20 is installed at the free end of the physiological saline outlet tube 3. The saline inlet channel 14 and the saline outlet channel 15 in the guide tube sheath are respectively connected to the physiological saline inlet tube 2 and the physiological saline outlet tube 3 through a water divider 8. A video / ultrasound signal cable channel 16 in the guide tube sheath is provided with a video / ultrasound cable for connecting the guide tube sheath rear camera 18, the guide tube sheath front camera 17 and the ultrasound probe module 21. The video signal cable passes through the handle 1 and then passes through the bottom of the handle 1;

[0062] A guide sheath front camera 17 is installed on the end of the guide sheath 12 away from the handle 1, and is aimed at the front end of the guide sheath 12. A guide sheath rear camera 18 is also installed on the guide sheath 12, and is aimed at the needle head of the steam delivery needle 13, and the liquid inlet 22 is aligned with the guide sheath rear camera 18.

[0063] The application method of the above-mentioned prostate steam ablation system comprises the following steps:

[0064] (1) The guide sheath of the prostate steam ablation system is inserted into the patient through the urethra to reach the patient's prostate. During the insertion process, the current position of the guide sheath can be determined by the front camera of the guide sheath;

[0065] (2) The system that controls prostate steam ablation delivers steam into the prostate through the steam delivery needle. During steam delivery, the state of the steam delivery needle tip can be obtained through the rear camera of the guide sheath and the state of the patient's treatment area can be observed. During the operation, the surgical site and the rear camera of the guide sheath are flushed through the saline inlet tube;

[0066] (3) After the operation is completed, the steam delivery needle is withdrawn and the steam generator is turned off, and the guide sheath is removed from the prostate through the urethra.

[0067] The prostate steam ablation system of the present invention has been verified to have a rational structural design and does not require a separate cystoscope. The overall design is an integrated system. The guide sheath is equipped with a guide sheath front camera and a guide sheath rear camera. The front camera can be used to observe the urethral tissue environment in real time, and the rear camera can observe the firing and retraction of the delivery needle and the treatment site at the same time. The addition of an ultrasound probe module to the guide sheath not only assists in positioning the puncture needle but also allows the ultrasound probe to determine the surgical effect during surgery. The steam delivery needle is driven by a micro-servo electric cylinder. Compared with magnetic drive components, its stroke accuracy is high, which minimizes puncture of the cyst wall. The guide sheath also has a dedicated saline inlet and outlet channel to facilitate flushing and clearing the field of view during surgery. The presence of the dedicated channel can avoid contamination and facilitate surgical operations. The integration of the steam delivery needle, the saline inlet channel within the guide sheath, and the saline outlet channel within the guide sheath can reduce the diameter of the guide sheath (diameter can be 6 mm), thereby reducing the surgical burden on patients and having good application prospects.

[0068] Those skilled in the art should understand that they can implement variations by combining the prior art with the above embodiments, which will not be described in detail here. Such variations do not affect the essence of the present invention and will not be described in detail here.

[0069] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-mentioned disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention. Industrial Applicability

[0070] The prostate steam ablation system of the present invention has a rational structural design and does not require a separate cystoscope. The overall design is integrated. The guide sheath is equipped with a guide sheath front camera and a guide sheath rear camera. The guide sheath front camera can be used to observe the urethral tissue environment in real time, and the guide sheath rear camera can observe the firing and retraction of the delivery needle and the treatment site at the same time. The addition of an ultrasound probe module to the guide sheath not only assists in positioning the puncture needle but also allows the ultrasound probe to determine the surgical effect during surgery. The steam delivery needle is driven by a micro-servo electric cylinder. Compared with magnetic drive components, its stroke accuracy is high, which minimizes puncture of the cyst wall. The guide sheath also has a dedicated saline inlet and outlet channel to facilitate flushing and clearing the field of view during surgery. The presence of the dedicated channel can avoid contamination and facilitate surgical operations. The integration of the steam delivery needle, the saline inlet channel within the guide sheath, and the saline outlet channel within the guide sheath can reduce the diameter of the guide sheath (the diameter can be 6 mm), thereby reducing the surgical burden on patients and having good application prospects.

Claims

1. A system for prostate steam ablation, characterized by: The invention comprises an introducer sheath for entering a patient's body through the urethra, a handle coupled to the introducer sheath, a steam generator disposed in the handle and configured to generate condensable steam, a steam delivery needle in communication with the steam generator and slidably disposed within the introducer sheath, and a micro servo cylinder attached to the steam delivery needle and for driving the steam delivery needle; The guide tube sheath is further provided with a saline inlet channel and a saline outlet channel. One end of the saline inlet channel is connected to the liquid inlet located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline inlet tube. The saline outlet channel is connected to the discharge port located at the end of the guide tube sheath away from the handle, and the other end is connected to the physiological saline outlet tube. The guide tube sheath is equipped with a front camera aimed at the front end of the guide tube sheath, a rear camera aimed at the needle head of the steam delivery needle, and an ultrasound probe module at the end of the guide tube sheath away from the handle, and the liquid inlet is aimed at the rear camera of the guide tube sheath.

2. A prostate steam ablation system according to claim 1, characterized in that: The saline inlet channel and the saline outlet channel in the guide tube sheath are connected to the saline inlet pipe and the saline outlet pipe respectively through a water divider; The front camera of the guide sheath is installed at the end of the guide sheath away from the handle end.

3. A prostate steam ablation system according to claim 2, characterized in that: The physiological saline inlet tube and the physiological saline outlet tube extend from the bottom of the handle; The free end of the physiological saline inlet tube is installed with a physiological saline inlet tube Luer connector, and the free end of the physiological saline outlet tube is installed with a physiological saline outlet tube Luer connector.

4. The system for prostate steam ablation according to claim 1, characterized in that: The steam generator is connected with a sterile distilled water inlet pipe away from the steam delivery needle end, and the sterile distilled water inlet pipe passes through the bottom of the handle.

5. The system for prostate steam ablation according to claim 1, characterized in that: The guide sheath is fixed on the handle via a knob and can rotate around the handle.

6. The system for prostate steam ablation according to claim 1, characterized in that: The guide tube sheath is also provided with an intra-guide tube sheath video / ultrasound signal cable channel, and the intra-guide tube sheath video / ultrasound signal cable is provided with a video / ultrasound signal cable for connecting the guide tube sheath rear camera, the guide tube sheath front camera and the ultrasound probe module. The video / ultrasound signal cable passes through the handle and then exits from the bottom of the handle.

7. The prostate steam ablation system according to claim 1, characterized in that: The control cable is passed through the handle from the bottom and then connected to the steam generator and micro servo cylinder signals respectively; The micro servo electric cylinder has a built-in force sensor; The steam generator is a pulse heater.

8. The system for prostate steam ablation according to claim 7, characterized in that: The handle is provided with a firing button for controlling the steam generator and the micro servo electric cylinder.

9. The method for using the prostate steam ablation system according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) The guide sheath of the prostate steam ablation system is inserted into the patient through the urethra to reach the patient's prostate. During the insertion process, the current position of the guide sheath can be determined by the front camera of the guide sheath; (2) The system that controls prostate steam ablation delivers steam into the prostate through the steam delivery needle. During steam delivery, the state of the steam delivery needle tip can be obtained through the rear camera of the guide sheath and the state of the patient's treatment area can be observed. During the operation, the surgical site and the rear camera of the guide sheath are flushed through the saline inlet tube.

10. The application method according to claim 9, characterized in that: Also includes: (3) After the operation is completed, the steam delivery needle is withdrawn and the steam generator is turned off, and the guide sheath is removed from the prostate through the urethra.

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