WO2024055914A1

WO2024055914A1 - Ablation needle driving system, pressure relief anti-scalding pipe, steam ablation system, and control method

Info

Publication number: WO2024055914A1
Application number: PCT/CN2023/117903
Authority: WO
Inventors: 鄢正清; 付建新; 徐孙希; 刘宇浩; 郑大路
Original assignee: 苏州恒瑞宏远医疗科技有限公司
Priority date: 2022-09-15
Filing date: 2023-09-11
Publication date: 2024-03-21

Abstract

Disclosed herein are an ablation needle driving system, a pressure relief anti-scalding pipe, a steam ablation system, and a control method. The ablation needle driving system comprises an ablation needle fixing device used for fixing an ablation needle and a driving device driving the ablation needle fixing device to move so as to drive the ablation needle to move. The ablation needle fixing device is driven to move by means of the driving device, so that the ablation needle can be driven, a larger driving force can be acquired, and thereby movement of the ablation needle is more reliable and the driving effect is better.

Description

Ablation needle drive system, pressure relief anti-scalding tube, steam ablation system and control method

This application claims the priority of the Chinese patent application with application number 2022111213595 and the invention title "A steam ablation system and its control method" submitted on September 15, 2022; it claims the priority of the application submitted on June 27, 2023 The priority of the Chinese patent application is No. 2023216402837, and the invention is titled "Pressure relief anti-scalding tube and steam ablation system"; the application number required to be submitted on July 25, 2023 is 2023109193121, and the invention is titled "An ablation needle driver System", which is fully incorporated into this application by reference.

【Technical field】

This application belongs to the technical field of medical devices, specifically involving ablation needle drive systems, pressure relief and anti-scalding tubes, steam ablation systems and control methods.

【Background technique】

Ablation surgery has the advantages of less trauma, shorter operation time, and fewer complications. The working principle of some current ablation systems, such as steam ablation systems, is that high-temperature steam passes through the ablation needle, and the high-temperature steam is discharged from the ablation needle tip to ablate the affected tissue. During the treatment, the ablation needle tip is inserted into the affected tissue, and the needle tip is retracted during the idle period. This avoids scratching healthy tissue when looking for the next treatment location or ending treatment. Therefore, the driving effect of the ablation needle directly affects the safety and therapeutic effect of ablation. However, current ablation needles are poorly driven.

[Content of the invention]

This application provides an ablation needle driving system, a pressure relief anti-scalding tube, a steam ablation system and a control method to solve the technical problem of poor ablation needle driving effect.

In order to solve the above technical problems, the present application provides an ablation needle driving system, which includes: an ablation needle fixing device used to fix the ablation needle; a driving device driving the ablation needle fixing device to move to drive the ablation needle to move.

Among them, the method includes: the ablation needle fixation device is a magnetophilic inner core; the driving device includes a driving coil, which is surrounding the outside of the magnetophilic inner core, and the driving coil is energized to attract the magnetophilic inner core, so as to The magnetophilic inner core is driven to move relative to the driving coil.

Wherein, the driving system includes: a coil holder, an inner cavity is formed in the coil holder, and the inner cavity has a first end and a second end oppositely arranged along a first direction; a magnetophilic inner core, which is movably arranged in the inner cavity along the first direction. The magnetic inner core is used to fix the ablation needle; the driving coil is wound around the outside of the coil holder, and the driving coil is energized to attract the magnetophilic inner core to provide power for the magnetophilic inner core to move toward the first end or the second end.

Wherein, the driving system also includes: a first retaining ring, which is disposed on the end of the coil support near the first end; a second retaining ring, which is disposed on the end of the coil support near the second end; and a first magnet, which is disposed on the first retaining ring. The side facing away from the magnetophilic inner core; the second magnet is arranged on the side of the second retaining ring facing away from the magnetophilic inner core.

Wherein, the area of the first retaining ring corresponding to the inner cavity can extend into the inner cavity; the area of the second retaining ring corresponding to the inner cavity can extend into the inner cavity.

It includes: a first end cover, which is located on the side of the first retaining ring facing away from the coil support, and the first magnet is located in the first end cover; a second end cover, which is located on the side of the second retaining ring facing away from the coil support. side, the second magnet is located inside the first end cap.

Wherein, the movement of the magnetophilic inner core toward the first end is used to drive the ablation needle in the needle insertion direction. When the magnetophilic inner core is attached to the second retaining ring, the magnetophilic inner core at least partially overlaps the driving coil.

The driving coil is a unidirectional coil and is formed by a single coil wound around the outside of the coil support.

Wherein, in the first direction, the driving coil is arranged centrally or biased towards one end of the coil support.

It includes: an ablation needle, which is inserted into the magnetophilic inner core and extends from the first end of the inner cavity to the outside of the coil holder; the delivery tube is connected to the ablation needle and extends from the second end of the inner cavity to the outside of the coil holder.

Among them, a plug-in slot is formed in the magnetophilic inner core along the first direction, and the ablation needle is inserted into the plug-in slot. A glue-containing slot is also provided on the surface of the magnetophilic inner core, and the glue-containing slot is connected to the plug-in slot.

It includes: an adhesive channel, which is provided at the end of the magnetophilic inner core facing the first end. The adhesive channel is connected to the insertion slot, and the inner diameter of the adhesive channel matches the outer diameter of the ablation needle for the ablation needle to pass through. .

It includes: a guide channel, which is provided at the end of the magnetophilic inner core facing the second end, the guide channel is connected with the plug-in slot, and the transport tube is passed through the guide channel.

Wherein, the inner wall of the coil support has a plurality of support ribs arranged at intervals and extending along the first direction.

It includes: a pull rod, which is arranged on the magnetophilic inner core and extends from the second end of the inner cavity to the outside of the coil support.

Among them, it includes: a first sensor, which is arranged outside the coil support and is located on the side of the pull rod facing the first end. When the magnetophilic inner core moves to the first retaining ring, the first sensor senses the pull rod; and/or, the second The sensor is arranged outside the coil support and is located on the side of the pull rod facing the second end. When the magnetophilic inner core moves to the second retaining ring, the second sensor senses the pull rod.

In order to solve the above technical problems, this application further provides a steam ablation system, wherein the steam ablation system includes any of the above-mentioned driving systems. In order to solve the above technical problems, this application also provides a pressure relief and anti-scalding pipe, which is used in a steam ablation system. The pressure relief and anti-scalding pipe includes a pipeline main body and an anti-scalding structure; the pipeline main body and the steam The ablation system is connected; the anti-scalding structure is set on the main body of the pipeline outer circumference to prevent the main body of the pipeline from scalding the user.

Wherein, the anti-scalding structure includes a heat dissipation rib, one or more heat dissipation ribs are provided, and the heat dissipation rib is provided on the outer wall of the pipeline main body to reduce the surface of the pipeline main body. temperature.

Among them, the main body of the pipeline is connected to the steam generating coil in the steam ablation system; there is a gap between any adjacent heat dissipation ribs to form a heat dissipation cavity.

Among them, a plurality of heat dissipation ribs are connected in sequence and arranged in a spiral shape on the outer wall of the pipeline main body.

Wherein, a plurality of heat dissipation ribs are arranged at intervals along the outer circumferential direction of the pipeline main body, and the plurality of heat dissipation ribs are all facing the center of the pipeline main body.

Wherein, the heat dissipation ribs are arranged in an annular shape, and a plurality of heat dissipation ribs are arranged at intervals along the axis direction of the pipeline body.

Among them, the pressure relief anti-scalding pipe also includes a heat insulation pipe; the heat insulation pipe is sleeved on the main body of the pipe, and a plurality of heat dissipation ribs are connected to the inner wall of the heat insulation pipe.

In order to solve the above technical problems, this application also provides a steam ablation system, which includes any of the above-mentioned pressure relief and anti-scalding tubes.

Wherein, the steam ablation system includes an ablation needle, a flexible connecting tube and a steam generating coil; both ends of the flexible connecting tube are connected to the ablation needle and the steam generating coil respectively, and the main body of the pipeline is connected to the flexible connecting tube.

Wherein, the steam ablation system also includes an introduction tube; the side wall of the introduction tube is provided with an opening, and the end of the ablation needle away from the flexible connecting tube is provided with a steam ejection part, the steam ejection part extends into the introduction tube, and the steam ejection part Ability to reach in and out through openings.

The steam ablation system further includes a driving member; the driving force generated by the driving member acts on the ablation needle, and the driving member is used to drive the ablation needle to move along the axis of the introduction tube.

Among them, the steam ablation system also includes a heating part; the heating part is set outside the steam generating coil, and the heating part is used to heat the steam generating coil.

In order to solve the above technical problems, this application also provides a steam ablation system, including: a steam device; a sterile water delivery device configured to pass sterile water into the steam device at a constant flow rate so that the steam device discharges steam; The pressure relief device and the ablation needle, the ablation needle can be pushed out or retracted relative to the steam device; when the ablation needle is pushed out relative to the steam device, the steam discharged by the steam device is discharged through the ablation needle; when the ablation needle is retracted relative to the steam device, the steam discharged by the steam device Steam can be vented through the pressure relief device.

Among them, a steam hole is provided on the cavity wall of the ablation needle. When the ablation needle is pushed out relative to the steam device, the steam device opens the steam hole so that the steam discharged by the steam device is discharged through the steam hole; when the ablation needle is retracted relative to the steam device, the steam The device blocks the steam hole so that the steam discharged by the steam device can be discharged through the pressure relief device.

Wherein, the steam device includes: a steam generating coil, one end of the steam generating coil is connected to the sterile water delivery device, and the other end is connected to the ablation needle; a heating coil is located around the periphery of the steam generating coil and is configured as Heating the steam generating coil, so that the steam generating coil discharges steam; and a blocking ring, which is set on the outer periphery of the ablation needle; when the ablation needle is pushed out relative to the blocking ring, the blocking ring opens the steam hole; when the ablation needle is relatively sealed When the blocking ring is retracted, the blocking ring blocks the steam hole.

Among them, the steam device includes: a steam generating coil, one end of the steam generating coil is connected to a sterile water conveying device; a steam conveying pipe and a heating coil. The head of the steam conveying pipe is open, and the steam conveying pipe is penetrated in the ablation In the cavity inside the needle, the steam delivery pipe is connected to the pressure relief device. The heating coil is located around the outer periphery of the steam generating coil and is configured to heat the steam generating coil so that the steam generating coil generates steam and flows into it. in the delivery tube; when the ablation needle is pushed out relative to the steam delivery tube, the steam delivery tube opens the steam hole; when the ablation needle is retracted relative to the steam delivery tube, the steam delivery tube blocks the steam hole.

Wherein, the steam delivery tube and the wall of the internal cavity of the ablation needle have a clearance fit.

Wherein, the steam device also includes: a flexible connecting pipe, one end of the flexible connecting pipe is connected and connected to the steam generating coil, and the other end is connected and connected to the steam delivery pipe.

Wherein, the steam device further includes: a sealing ring, fixed on the cavity wall of the tail of the ablation needle, and sandwiched between the cavity wall of the ablation needle and the outer wall of the steam delivery tube.

Wherein, a plurality of steam holes are spaced on the cavity wall of the ablation needle. When the ablation needle is retracted relative to the steam device, the steam device blocks each steam hole.

Wherein, a plurality of steam holes are provided at intervals on the cavity wall of the ablation needle, and a first exhaust hole is provided on the wall of the steam delivery pipe. When the ablation needle retreats relative to the steam delivery pipe, at least one steam hole is connected to the first exhaust hole. The holes are facing each other and the remaining steam holes are blocked by the steam delivery pipe.

Wherein, the cavity wall of the ablation needle is also provided with a vent hole. When the ablation needle is pushed out or retracted relative to the steam delivery tube, the vent hole is connected to the steam delivery tube.

Wherein, the steam ablation system also includes: a waste liquid recovery device, which is connected with the pressure relief device and is configured to collect steam discharged by the pressure relief device.

Wherein, the steam ablation system also includes: a driving system configured to drive the ablation needle to push out or retract relative to the steam device.

Wherein, the steam ablation system also includes: an introduction tube, a first cavity and a second cavity are spaced inside the introduction tube, the ablation needle is movably inserted into the first cavity, and the head of the ablation needle can pass through the third cavity. A cavity and a second cavity protrude from the introduction tube; and an endoscope is inserted into the second cavity, and the lens of the endoscope is positioned directly opposite the head of the ablation needle.

Wherein, the head of the ablation needle is provided with a marking ring.

Wherein, a gap is formed between the endoscope and the cavity wall of the second cavity, so that the flushed physiological saline can flow through the gap.

In order to solve the above technical problems, this application also provides a steam ablation system, including: a steam device; a sterile water delivery device configured to pass sterile water into the steam device at a constant flow rate so that the steam device discharges steam; and an ablation needle. A steam hole is provided on the cavity wall of the ablation needle. The ablation needle can be pushed out or retracted relative to the steam device; when the ablation needle is pushed out relative to the steam device, the steam device opens the steam hole so that the steam discharged by the steam device can pass through the steam hole. The steam hole is discharged; when the ablation needle is retracted relative to the steam device, the steam device blocks the steam hole.

Among them, the steam device includes: a steam generating coil, one end of the steam generating coil is connected to a sterile water conveying device; a steam conveying pipe and a heating coil. The head of the steam conveying pipe is open, and the steam conveying pipe is penetrated in the ablation In the cavity inside the needle, the heating coil is surrounding the outer periphery of the steam generating coil and is configured to heat the steam generating coil so that the steam generating coil generates steam and passes it into the steam delivery pipe; when the ablation needle is relative to the steam delivery pipe When the tube is pushed out, the steam delivery tube opens the steam hole; when the ablation needle is retracted relative to the steam delivery tube, the steam delivery tube blocks the steam hole.

In order to solve the above technical problems, this application also provides a steam ablation system control method for the steam ablation system. The steam ablation system includes a steam device, a sterile water delivery device, a pressure relief device and an ablation needle. The driving system adopts the above-mentioned method. Driving system, wherein the steam ablation system control method includes the following steps: after starting the steam ablation system, the sterile water delivery device supplies sterile water to the steam device at a constant flow rate so that the steam device discharges steam; when the ablation target tissue is When performing thermal ablation, the driving system controls the ablation needle to be pushed out relative to the steam device, and the steam discharged by the steam device is discharged through the ablation needle; when the ablation needle is in the treatment gap, all the steam discharged by the steam device is discharged through the pressure relief device or the steam discharged by the steam device. Part of it is discharged through the pressure relief device.

The beneficial effects of this application are: by instantaneously energizing the driving coil, the driving coil winding forms an instant strong magnetic field. The strong magnetic field has an attraction for the magnetophilic core, causing the magnetophilic inner core to move toward the center of the driving coil until the third position of the coil holder. One end. Instantly energize the drive coil again, and the magnetophilic inner core will be ejected to the second end of the coil holder in the same way, thereby realizing the advancement and withdrawal of the ablation needle. The driving system of this application forms a strong magnetic field by passing high voltage and large current through the driving coil, and attracts the magnetophilic inner core to move. It has a large driving force and driving speed for the magnetophilic inner core, and can change the driving force and driving speed by adjusting different instantaneous voltages. Driving speed, thereby achieving rapid response of the ablation needle and obtaining greater driving force. The movement of the ablation needle is more reliable and the driving effect is better. Since the driving coil of the present application can drive the magnetophilic inner core to move when it is instantly energized, the driving coil will not generate heat due to continuous energization, which can ensure the magnetic force of the magnetic field formed by the driving coil and avoid a decrease in driving force.

The pressure relief and anti-scalding pipe provided by this application is used in a steam ablation system. It is connected to the steam generating coil in the steam ablation system through the main body of the pipeline. The hot steam in the steam generating coil enters the main body of the pipeline. One or more heat dissipation ribs are provided on the outer wall of the main body. The gaps between the heat dissipation ribs form a heat dissipation cavity. The heat of the pipe body is dissipated in the heat dissipation cavity through the surface of the heat dissipation ribs, thereby increasing the temperature of the surface of the pipe body. Furthermore, the heat dissipation ribs can reduce the contact area between the skin and the pipeline main body, thereby effectively avoiding burns to the surgeon or the patient, and alleviating the problem in the prior art that steam flows into the waste through the pressure relief valve during the treatment interval. The liquid recovery device causes the surface temperature of the entire pressure relief pipeline to be relatively high, which can easily cause burns to the patient or the surgeon.

The steam ablation system provided by this application connects a pressure relief device to the steam device. When the ablation needle is pushed out relative to the steam device, that is, during the treatment period, the steam discharged by the steam device is discharged through the ablation needle to achieve thermal ablation of the tissue. When the ablation needle is retracted relative to the steam device, that is, during the treatment interval, the steam discharged by the steam device can be discharged through the pressure relief device to prevent excessive steam from being discharged through the ablation needle and scalding the patient. In addition, the setting of the pressure relief device allows the sterile water delivery device to always pass sterile water to the steam device at a constant flow rate during treatment and treatment intervals, avoiding the occurrence of negative pressure at the ablation needle site during treatment intervals. It also shortens the steam response time during the next treatment, allowing the ablation needle to instantly generate steam for ablation during the next treatment, improving treatment efficiency.

In the steam ablation system provided by this application, when the ablation needle is pushed out relative to the steam device, that is, during the treatment period, the steam device opens the steam hole so that the steam discharged by the steam device is discharged through the steam hole to achieve thermal ablation of the tissue. When the ablation needle is retracted relative to the steam device, that is, during the treatment interval, the steam device blocks the steam hole to prevent excessive steam from being discharged through the ablation needle and scalding the patient. In addition, the setting of the pressure relief device allows the sterile water delivery device to always pass sterile water to the steam device at a constant flow rate during treatment and treatment intervals, avoiding the occurrence of negative pressure at the ablation needle site during treatment intervals. It also shortens the steam response time during the next treatment, allowing the ablation needle to instantly generate steam for ablation during the next treatment, improving treatment efficiency.

The steam ablation system control method provided by this application allows the ablation needle to discharge steam during the treatment period to achieve thermal ablation of the tissue. During the treatment interval, it can avoid excessive steam being discharged through the ablation needle and scalding the patient. In addition, the setting of the pressure relief device allows the sterile water delivery device to always pass sterile water to the steam device at a constant flow rate during treatment and treatment intervals, avoiding the occurrence of negative pressure at the ablation needle site during treatment intervals. It also shortens the steam response time during the next treatment, allowing the ablation needle to instantly generate steam for ablation during the next treatment, improving treatment efficiency.

[Picture description]

In order to explain the technical solutions in the embodiments of the present application more clearly, the drawings needed to be used in the description of the embodiments will be briefly illustrated below. Introduction: Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts. in:

Figure 1 is a schematic structural diagram of an embodiment of the steam ablation system of the present application with the ablation needle in a pushed-out state;

Figure 2 is a schematic structural diagram of an embodiment of the steam ablation system of the present application with the ablation needle in a retracted state;

Figure 3 is a schematic diagram of the overall structure of an embodiment of the ablation needle driving system of the present application, in which the magnetophilic inner core is located at the first end;

Figure 4 is a partial structural schematic diagram of an embodiment of the ablation needle driving system of the present application, in which the length of the driving coil in Figure a is shorter, and the position of the driving coil on the coil holder in Figure b is not centered;

Figure 5 is a partial structural schematic diagram of an embodiment of the ablation needle driving system of the present application, in which the magnetophilic inner core is located at the second end;

Figure 6 is a partial structural schematic diagram of an embodiment of the ablation needle driving system of the present application, in which the magnetophilic inner core is located at a position where the side of the magnetophilic inner core facing the first end is aligned with the side of the driving coil facing the second end;

Figure 7 is a schematic diagram of the overall structure of another embodiment of the ablation needle driving system of the present application;

Figure 8 is a schematic cross-sectional structural view of the magnetophilic inner core of an embodiment of the ablation needle driving system of the present application;

FIG9 is a schematic diagram of the three-dimensional structure of a magnetically friendly inner core of an embodiment of an ablation needle driving system of the present application;

Figure 10 is a schematic diagram of the overall structure of another embodiment of the ablation needle driving system of the present application;

Figure 11 is a partial structural diagram of an embodiment of the steam ablation system of the present application;

Figure 12 is a cross-sectional view of the main part of the introduction tube of an embodiment of the steam ablation system of the present application;

Figure 13 is a partial structural diagram 2 of an embodiment of the steam ablation system of the present application;

Figure 14 is a partial cross-sectional view of the ablation needle and steam delivery tube of an embodiment of the steam ablation system of the present application;

Figure 15 is a schematic structural diagram of another embodiment of the steam ablation system of the present application with the ablation needle in a pushed-out state;

Figure 16 is a schematic structural diagram of the ablation needle in a retracted state according to another embodiment of the steam ablation system of the present application;

Figure 17 is a partial cross-sectional view of the ablation needle and blocking ring of another embodiment of the steam ablation system of the present application;

Figure 18 is a partial cross-sectional view of the ablation needle and steam delivery tube of another embodiment of the steam ablation system of the present application;

Figure 19 is a partial cross-sectional view of the ablation needle and steam delivery tube of another embodiment of the steam ablation system of the present application;

Figure 20 is a partial cross-sectional view of the ablation needle and steam delivery tube of another embodiment of the steam ablation system of the present application;

Figure 21 is a partial cross-sectional view of the ablation needle and steam delivery tube provided by another embodiment of the steam ablation system of the present application;

Figure 22 is a cross-sectional view of the overall structure of the first embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 23 is a schematic diagram of the overall structure of the first embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 24 is a cross-sectional view of the overall structure of the second embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 25 is a schematic diagram of the overall structure of the second embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 26 is a cross-sectional view of the overall structure of the third embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 27 is a schematic diagram of the overall structure of the third embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 28 is a cross-sectional view of the overall structure of the fourth embodiment of the pressure relief anti-scalding pipe of the present application;

Figure 29 is a schematic diagram of the overall structure of the fourth embodiment of the pressure relief anti-scalding pipe of the present application.

【Detailed ways】

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this application. It can be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for convenience of description, only some but not all structures related to the present application are shown in the drawings.

First, a brief introduction is given to the steam ablation system in the embodiment of the present application. An embodiment of the present application provides a steam ablation system. The steam ablation system can be inserted into the patient's affected area and perform thermal ablation on the patient's affected tissue to achieve treatment. the goal of. For example, the steam ablation system can be inserted into the patient's urethra and thermally ablate the patient's prostatic hyperplasia tissue to treat prostatic hyperplasia.

The steam ablation system provided in this embodiment includes an introduction tube 7, a steam device 2, a sterile water delivery device 3, and an ablation needle 1. The introduction tube 7 can be inserted into the patient's urethra, and a first cavity is opened in the introduction tube 7. 711. The ablation needle 1 is movably inserted into the first cavity 711, and the head of the ablation needle 1 can extend out of the introduction tube 7. The sterile water delivery device 3 is in communication with the steam device 2, and the sterile water delivery device 3 is connected to the steam device 2. Sterile water can be introduced into the steam device 2 , the steam device 2 can heat and convert the introduced sterile water into steam, and the steam discharged by the steam device 2 can be discharged into the cavity inside the ablation needle 1 , and the ablation needle 1 It can be pushed out or retracted relative to the steam device 2 and the introduction pipe 7 . As shown in Figure 1, when the ablation needle 1 needs to perform thermal ablation on the patient's prostatic hyperplasia tissue, the ablation needle 1 is pushed out relative to the steam device 2 and the introduction tube 7, and the head of the ablation needle 1 can extend out of the introduction tube 7, and The steam in the cavity of the ablation needle 1 can be discharged to the patient's prostate hyperplasia tissue through the head of the ablation needle 1. After thermal ablation is completed, or during a treatment interval, as shown in Figure 2, the ablation needle 1 can be relative to the steam device. 2 and the introduction tube 7 are retracted, so that the head of the ablation needle 1 is retracted into the first cavity 711 of the introduction tube 7 .

In addition, as shown in Figures 1 and 2, the steam ablation system also includes an ablation needle driving system 6. The ablation needle driving system 6 is used to drive the ablation needle 1 to push out or retract relative to the steam device 2 and the introduction tube 7.

The inventor has discovered through long-term research that some existing ablation needle drive systems use screw drives or rack and pinion drives, which have the disadvantages of large drive modules and slow response. Some existing ablation needle drive systems also use spring drive. The elastic potential energy of the spring is weakened and the driving force is unstable. The operator needs to manually withdraw the needle and compress the spring.

Some existing ablation needle drive systems also use bidirectional winding coils to pass forward and reverse currents to push and pull the magnetic field, thereby driving the permanent magnet core to move. By continuously energizing the two coils (or energizing with a duty cycle), a force is continuously given to the permanent magnet core, so that the permanent magnet core and the retaining ring fit together, thereby forming position maintenance. However, in this solution, the current is continuously energized. The coil is prone to heat, and the magnetic field formed by the heated coil weakens, resulting in a decrease in driving force; at the same time, because the permanent magnet will also demagnetize in a reverse magnetic field, the permanent magnet will be easily demagnetized in a strong magnetic field with high voltage and large current. Therefore, the coil in this solution cannot use high voltage and large current, and the driving force is small; in addition, the high temperature of the steam during steam ablation will cause the permanent magnet to demagnetize, thus affecting the ablation needle driving effect; because the permanent magnet core in this solution is in two parts at the same time, In a coil, the driving stroke is limited. Therefore, the solution of bidirectional winding coils and permanent magnets has the disadvantages of limited driving stroke, average driving force, and average holding force.

The driving system 6 of the present application includes an ablation needle fixation device and a driving device. The ablation needle fixation device is used to fix the ablation needle 1. The driving device drives the ablation needle fixing device to move to drive the ablation needle 1 to move. By driving the ablation needle fixing device to move through the driving device, the ablation needle 1 is driven, and a greater driving force can be obtained. The movement of the ablation needle 1 is more reliable and the driving effect is better.

The ablation needle fixation device may be a magnetophilic inner core 61 . The driving device includes a driving coil 62 , which is arranged around the outside of the magnetophilic inner core 61 . The driving coil 62 is energized to attract the magnetophilic inner core 61 to drive the magnetophilic inner core 61 to move relative to the driving coil 62 . Specifically, the driving system 6 in the embodiment of the present application includes a magnetophilic inner core 61 and a driving coil 62. The magnetophilic inner core 61 is fixed to the outer wall of the ablation needle 1, and the driving coil 62 is surrounded by the magnetophilic inner core 61. Outside 61, the driving coil 62 can drive the magnetophilic inner core 61 to move relative to the driving coil 62. Specifically, when the driving coil 62 is energized in the forward direction, the magnetophilic inner core 61 drives the ablation needle 1 to push out relative to the steam device 2 and the introduction tube 7 under the action of the magnetic field force. When the driving coil 62 is energized in the reverse direction, the promagnetic core 61 The magnetic inner core 61 drives the ablation needle 1 to retreat relative to the steam device 2 and the introduction tube 7 under the action of the magnetic field force.

First, a brief introduction to the driving principle is given. Please refer to Figure 1. The ablation needle driving system 6 drives the ablation needle 1 to enter the needle and extend out of the introduction tube 7 to perform ablation work. The ablation needle driving system 6 can also drive the ablation needle 1 to withdraw the needle and return it to the introduction tube 7 to ensure the safety of use under non-ablation work.

The ablation needle driving system 6 will be introduced in detail below. An embodiment of the present application provides an ablation needle driving system 6 , please refer to FIG. 3 , including a coil holder 610 , a magnetophilic inner core 61 and a driving coil 62 . An inner cavity 611 is formed in the coil holder 610 . The inner cavity 611 has a first end 601 and a second end 602 oppositely arranged along the first direction X. The magnetophilic inner core 61 is movably arranged in the inner cavity 611 along the first direction X. The ablation needle 1 is fixed on the magnetophilic inner core 61 . The ablation needle 1 can extend from the first end 601 to the outside of the coil holder 610 . The driving coil 62 is wound around the outside of the coil bracket 610 . The driving coil 62 is energized to attract the magnetophilic inner core 61 to provide power for the magnetophilic inner core 61 to move toward the first end 601 or the second end 602 .

Before the driving system 6 operates, the magnetophilic inner core 61 can be driven to move to the second end 602 of the inner cavity 611 , and the ablation needle 1 is in the needle withdrawal state. At this time, the center of the magnetophilic inner core 61 deviates from the center of the driving coil 62 . When the driving coil 62 continues to be energized, the driving coil 62 will form a magnetic field. Under the action of the magnetic field, the magnetophilic inner core 61 is attracted. Since the coil bracket 610 is a fixed part, under the action of the magnetic field, the magnetophilic inner core 61 moves toward The direction of the movement of the first end 601 fluctuates back and forth due to inertia until the center of the magnetophilic inner core 61 is aligned with the center of the driving coil 62 , and finally stops at a position where the center of the magnetophilic inner core 61 is aligned with the center of the driving coil 62 . Therefore, if the driving coil 62 is controlled to be energized instantaneously, the driving coil 62 will be deenergized and lose its magnetic field. At the same time, the magnetophilic inner core 61 will also demagnetize rapidly. At this time, there is no magnetic field, and the magnetophilic inner core 61 still has the potential energy to move toward the center of the driving coil 62, which can Continue to move toward the first end 601 until it moves to the first end 601 and the ablation needle 1 is in the needle insertion state.

Therefore, by instantaneously energizing the driving coil 62, the winding of the driving coil 62 forms an instant strong magnetic field. The strong magnetic field has an attraction to the magnetophilic core, causing the magnetophilic inner core 61 to move toward the center of the driving coil 62 until the third position of the coil support 610. 601 on one end. When the driving coil 62 is instantly energized again, the magnetophilic inner core 61 will be ejected to the second end 602 of the coil holder 610 in the same manner, thereby realizing the needle insertion and withdrawal of the ablation needle 1 .

The driving system 6 of the present application uses a driving coil 62 to cooperate with the magnetophilic inner core 61. It can pass high voltage and large current through the driving coil 62 to form a strong magnetic field, and attract the magnetophilic inner core 61 to move, thereby exerting a driving force and driving force on the magnetophilic inner core 61. The speed is large, and the driving force and driving speed can be changed by adjusting different instantaneous voltages, thereby realizing a quick response of the ablation needle 1 and obtaining greater driving force. The movement of the ablation needle 1 is more reliable and the driving effect is better. The magnetophilic inner core 61 has no magnetism and can be attracted by the magnetic field. It can also be demagnetized quickly after magnetization. There is no problem of demagnetization under high voltage and large current or high temperature of steam during steam ablation. In addition, since the driving coil 62 of the present application can drive the magnetophilic inner core 61 to move when it is energized instantaneously, the driving coil 62 will not generate heat due to continuous energization, which can ensure the magnetic force of the magnetic field formed by the driving coil 62 and avoid a decrease in driving force.

Since the driving system 6 of the present application has the advantage of rapid response and can quickly advance and withdraw the needle, firstly, it can improve the operator's experience; secondly, it can perform ablation work immediately after the needle insertion command is triggered, without causing burns. Healthy tissue; thirdly, the ablation needle 1 can be withdrawn to the introduction shaft immediately after the needle withdrawal command is issued without scratching the tissue.

Since the driving system 6 of the present application has the advantage of large driving force, the ablation needle 1 can stably penetrate into the affected area during needle insertion, thereby improving the ablation effect. Please refer to Figure 4. The length of the coil support 610 in the first direction X is S, the length of the magnetophilic inner core 61 in the first direction n, 0<n<s. Since the driving force of the driving coil 62 in this solution is greater, referring to diagram a in FIG. 4 , the length of the driving coil 62 can be set shorter. Since this application uses a single drive coil 62 to drive the magnetophilic inner core 61 to move, compared to the driving method using two forward and reverse coils, under the same size constraints, the driving stroke range of the drive system 6 of this application is wider. The ablation needle 1 can reach distant affected areas, and the setting method of the driving coil 62 is more flexible, thereby improving the ablation effect.

Referring to figure a in Figure 4, in the first direction The driving force is the same, so that the driving force of the ablation needle 1 when entering and withdrawing the needle is the same. Referring to Figure b in Figure 4, in the first direction The driving force is different. Specifically, in Figure b in Figure 4, the driving coil 62 is biased toward the first end 601, and the movement of the magnetophilic inner core 61 toward the first end 601 is the direction in which the ablation needle 1 is driven. At this time, the ablation needle 1 is inserted. The driving force is greater.

The driving coil 62 is a unidirectional coil and is formed by a single coil wound around the outside of the coil bracket 610 . Specifically, referring to FIG. 3 , a groove may be formed outside the coil support 610 for winding the driving coil 62 . The driving coil 62 can be a single-turn multi-layer coil wound by wires with a wire diameter of 0.4-1.0 mm. For example, enameled wire with a wire diameter of 0.4mm, 0.6mm or 0.8mm. Specifically, the driving coil 62 is a single winding and is wound with about 800 turns of AWG#30 magnet wire. Under the action of the driving coil 62, the ablation needle 1 is pushed out/retracted through its complete stroke of about 11 mm in 0.02 seconds. Increasing the length of the driving coil 62 can increase the driving force of the driving system 6 to a certain extent, or increasing the number of winding turns and coil current of the driving coil 62 can also achieve the same effect.

Specifically, the voltage of high-voltage instantaneous electricity that can be passed through the driving system 6 of the present application is 80V-400V, such as 80V, 120V, 230V, 370V or 400V, etc. The higher the voltage, the stronger the magnetic field, and the greater the driving force. Among them, the current can be stored through the capacitor and then released instantly to form a high voltage and large current, thereby driving the magnetophilic inner core 61 .

Specifically, the magnetophilic inner core 61 may be a soft iron core. Soft iron is non-magnetic and is easily magnetized after being attracted by a magnetic field. After being magnetized, it is easy to demagnetize quickly. Preferably, the soft iron core is generally made of DT4 or 1j117, etc., which can prevent the magnetophilic inner core 61 from being magnetized into a permanent magnet, and can be quickly demagnetized to avoid affecting the driving force and driving direction after being magnetized. Since the magnetophilic inner core 61 adopts a soft iron core, driving the magnetophilic inner core 61 to move depends on the magnetic field formed after the driving coil 62 is energized to attract metal, and will not be affected by time and high temperature, thereby improving the reliability of the driving ablation needle 1 higher. It should be noted that the magnetophilic inner core 61 is a material that has no magnetism and can be attracted by a magnetic field. It can also be quickly demagnetized after being magnetized. In other embodiments, the magnetophilic inner core 61 can also be made of metal materials such as diamond and nickel.

In order to reduce the friction force during the movement of the magnetophilic inner core 61 within the inner cavity 611, in some embodiments, please refer to Figures 3 and 8, the inner wall of the coil holder 610 has a plurality of spaced strips along the first direction X Extended support ribs 612. The support ribs 612 can separate the magnetophilic inner core 61 from the inner wall of the coil support 610 , thereby reducing the friction force of the magnetophilic inner core 61 during its movement within the inner cavity 611 . Specifically, the support ribs 612 have two ribs, three ribs, or four ribs.

In some embodiments, referring to FIG. 3 , the driving system 6 further includes a first retaining ring 641 and a second retaining ring 642 . The first retaining ring 641 is disposed at the end of the coil holder 610 close to the first end 601 , and the area of the first retaining ring 641 corresponding to the inner cavity 611 can extend into the inner cavity 611 . The second retaining ring 642 is disposed at the end of the coil holder 610 close to the second end 602 , and the area of the second retaining ring 642 corresponding to the inner cavity 611 can extend into the inner cavity 611 . By providing the second retaining ring 642, the extreme position of the magnetophilic inner core 61 in the inner cavity 611 can be restricted from moving toward the second end 602, and by disposing the first retaining ring 641, the magnetophilic inner core 61 can be restricted from moving toward the first end in the inner cavity 611. 601 moves to the extreme position to prevent the magnetophilic inner core 61 from breaking away from the coil support 610.

The driving stroke of the ablation needle 1 in the embodiment of the present application has multiple adjustment methods.

The first type: the replaceable coil holder 610. By adjusting the length of the coil holder 610, the length of the inner cavity 611 can be changed, thereby adjusting the moving stroke of the magnetophilic inner core 61 in the inner cavity 611, thereby realizing the driving stroke of the ablation needle 1. Adjustment.

Second type: the magnetophilic inner core 61 is replaceable. By adjusting the length of the magnetophilic inner core 61, the moving stroke of the magnetophilic inner core 61 in the inner cavity 611 can be adjusted, thereby adjusting the driving stroke of the ablation needle 1.

The third type: the first retaining ring 641 and/or the second retaining ring 642 can be replaced by changing the position of the first retaining ring 641 and the second retaining ring 642 corresponding to the area of the inner cavity 611 extending into the inner cavity 611, for example, The first retaining ring 641 and the second retaining ring 642 can bulge toward the inside of the inner cavity 611, thereby shortening the movable stroke of the magnetophilic inner core 61 and thereby adjusting the driving stroke of the ablation needle 1 to achieve the best driving effect.

The ablation needle driving system 6 in the embodiment of the present application can not only replace the coil holder 610, but also can realize the ablation needle by replacing the first retaining ring 641 and/or the second retaining ring 642 when the coil holder 610 has a certain length. 1. To adjust the driving stroke, there is no need to adjust the overall length of the coil bracket 610, making the adjustment more convenient. In addition, in addition to adjusting the first retaining ring 641 and/or the second retaining ring 642 to adjust the driving stroke of the ablation needle 1, the driving stroke of the ablation needle 1 can also be changed by adjusting the length of the magnetophilic inner core 61 without adjusting the coil holder 610 length, no need to adjust the overall structure, small module size and high versatility.

In some embodiments, please refer to FIG. 3 . The ablation needle 1 extends from the first end 601 of the inner cavity 611 to the outside of the coil holder 610 . Therefore, the magnetophilic inner core 61 can be moved toward the first end 601 to drive the ablation needle 1 for insertion. direction. Under normal circumstances, before inserting the needle, the magnetophilic inner core 61 is in contact with the second retaining ring 642, and the driving coil 62 is energized, which can drive the magnetophilic inner core 61 to move toward the first end 601 until it is in contact with the first retaining ring 641. The ablation needle 1 is inserted into the needle; when the driving coil 62 is energized, it can also drive the magnetophilic inner core 61 to retract from the first end 601 and fit into the second retaining ring 642, so that the ablation needle 1 can be withdrawn.

Among them, in order to better realize the driving of the ablation needle 1, please refer to Figure 5. When the magnetophilic inner core 61 is attached to the second retaining ring 642, the magnetophilic inner core 61 at least partially overlaps the driving coil 62, and the driving When the coil 62 is energized, it can attract the magnetophilic inner core 61 toward the first end 601 and ensure a certain strength of attraction, ensuring that the magnetophilic inner core 61 has the power to move toward the first end 601 to achieve the ablation needle 1 Fast response and greater driving force. It should be noted that the magnetophilic inner core 61 at least partially overlaps the driving coil 62, including that one end of the magnetophilic inner core 61 facing the first end 601 is aligned with an end of the driving coil 62 facing the second end 602. Please refer to Figure 6. One end of the inner core 61 facing the first end 601 is aligned with an end of the driving coil 62 facing the second end 602. The other end of the magnetophilic inner core 61 is attached to the second retaining ring 642. At this time, it is the right side of the magnetophilic inner core 61. At the critical position, only by ensuring that the magnetophilic inner core 61 and the driving coil 62 at least partially overlap can the driving coil 62 have a good driving effect on the magnetophilic inner core 61 . Of course, in other embodiments, when the magnetic field formed by energizing the driving coil 62 is strong enough, when the magnetophilic inner core 61 and the second retaining ring 642 are attached, alignment can be achieved even if the magnetophilic inner core 61 and the driving coil 62 do not overlap. The drive of the magnetic core 61 is not limited here.

Under normal circumstances, the instantaneous energization of the driving coil 62 can realize that the magnetophilic inner core 61 moves from the first end 601 to the extreme position where the second end 602 and the second retaining ring 642 fit in the inner cavity 611, and from the second The end 602 moves to the extreme position where the first end 601 and the first retaining ring 641 fit together, achieving reciprocating movement between the first end 601 and the second end 602 of the inner cavity 611. However, the drive system 6 may be abnormally stuck. In order to ensure the safe operation of the driving system 6 , in some embodiments, please refer to FIG. 7 , the driving system 6 includes a tie rod 280 . The pull rod 280 is disposed on the magnetophilic inner core 61 and extends from the second end 602 of the inner cavity 611 to the outside of the coil support 610 . When the driving system 6 is abnormally stuck, the operator can manually pull the pull rod 280 to drive the magnetophilic inner core 61 to move, thereby returning the ablation needle 1 to a safe position. In addition, by pulling the pull rod 280, you can also manually adjust the position of the magnetophilic inner core 61 before needle insertion, adjust the distance between the magnetophilic inner core 61 and the second retaining ring 642, and adjust the driving stroke of the ablation needle 1.

In some embodiments, referring to FIG. 3 , the driving system 6 further includes a first magnet 651 and a second magnet 652 . The first magnet 651 is disposed on the side of the first retaining ring 641 facing away from the magnetophilic inner core 61 . The second magnet 652 is disposed on the side of the second retaining ring 642 facing away from the magnetophilic inner core 61 . Specifically, when the magnetophilic inner core 61 is located at the second end 602, the driving coil 62 is energized instantaneously, driving the magnetophilic inner core 61 to overcome the attractive force of the second magnet 652 and move toward the first end 601, and the magnetophilic inner core 61 moves to The first retaining ring 641 is attracted and held by the first magnet 651. At this time, the magnetophilic inner core 61 can be stabilized in the needle insertion state. The first magnet 651 provides sufficient holding force for the magnetophilic inner core 61, so that the ablation needle 1. Keep in a stable position while working. The driving coil 62 is energized again instantaneously, driving the magnetophilic inner core 61 to overcome the attraction of the first magnet 651 and move to the second end 602. The magnetophilic inner core 61 moves to the second retaining ring 642 and is attracted by the second magnet 652. Hold, at this time, the magnetophilic inner core 61 can be stabilized in the needle withdrawal state, and the second magnet 652 provides sufficient holding force for the magnetophilic inner core 61 so that the ablation needle 1 can achieve stable needle withdrawal. By arranging the first magnet 651 and the second magnet 652, sufficient holding force can be provided for the magnetophilic inner core 61, so that the ablation needle 1 can be kept in a stable position during transportation or working state.

The first magnet 651 and the second magnet 652 are used to adsorb the magnetophilic inner core 61 when the power is off, and provide holding force to stabilize the magnetophilic inner core 61 in the needle insertion state or needle withdrawal state. The first magnet 651 and the second magnet 652 have central holes for passing the ablation needle 1, delivery tube 272, endoscope and other accessories. Specifically, the first magnet 651 and the second magnet 652 are permanent magnets.

At this time, in addition to limiting the position of the magnetophilic inner core 61, the first retaining ring 641 and the second retaining ring 642 also play a buffering role for the magnetophilic inner core 61. According to the requirements for the holding force of the ablation needle 1, the first The first retaining ring 641 and the second retaining ring 642 can also use different materials or different thicknesses to adjust the attraction between the first magnet 651 and the second magnet 652 and the magnetophilic inner core 61 to adjust the holding force.

In some embodiments, referring to FIG. 3 , the driving system 6 further includes a first end cover 661 and a second end cover 662 . The first end cap 661 covers the side of the first retaining ring 641 facing away from the coil support 610, and the first magnet 651 is located in the first end cap 661. The second end cap 662 covers the side of the second retaining ring 642 facing away from the coil support 610, and the second magnet 652 is located in the second end cap 662. The first end cap 661 plays a positioning and protecting role for the first magnet 651 and the first retaining ring 641, and the second end cap 662 plays a positioning and protecting role for the second magnet 652 and the second retaining ring 642.

In some embodiments, referring to FIG. 3 , the drive system 6 further includes an ablation needle 1 and a delivery tube 272 . The ablation needle 1 is inserted into the magnetophilic inner core 61 and extends from the first end 601 of the inner cavity 611 to the outside of the coil holder 610 for performing ablation treatment. The delivery tube 272 is connected to the ablation needle 1 and extends from the second end 602 of the inner cavity 611 to the outside of the coil holder 610 for the passage of external instruments or drugs.

The ablation needle 1 may be a steam ablation needle 1. External high-temperature steam is transported to the ablation needle 1 through the delivery tube 272, and the high-temperature steam is discharged from the needle tip of the ablation needle 1 to ablate the affected tissue. The ablation needle 1 may also be an electrode ablation needle 1, and the delivery tube 272 provides a path for electrode conduction. The ablation needle 1 can also be other types of ablation needles 1, which are selected according to the actual situation and are not limited here.

Among them, the delivery tube 272 is generally made of plastic materials such as PEEK (polyetheretherketone), which has physical and chemical properties such as high temperature resistance, chemical corrosion resistance, and good insulation, and is suitable for various types of ablation needles 1 .

In some embodiments, please refer to FIG. 3 , FIG. 8 and FIG. 9 , the magnetophilic inner core 61 is formed with an insertion slot 6101 penetrating along the first direction X, and the ablation needle 1 is inserted into the insertion slot 6101 . The magnetophilic inner core 61 and the ablation needle 1 can be fixed by adhesive. In order to facilitate the injection of adhesive material into the plug-in slot 6101, a glue-containing groove 6102 is also provided on the surface of the magnetophilic core 61, and the glue-containing groove 6102 is connected to the plug-in slot 6101. Through the glue-containing groove 6102 on the surface of the magnetophilic inner core 61, adhesive material can be easily injected into the plug-in slot 6101, thereby facilitating the ablation needle 1 to be fixed in the plug-in slot 6101. inside, the fixation effect between the ablation needle 1 and the magnetophilic inner core 61 is improved. Specifically, the adhesive material can be instant glue, epoxy glue or structural glue.

Further, the driving system 6 also includes an adhesive channel 6103. The adhesive channel 6103 is disposed at the end of the magnetophilic inner core 61 facing the first end 601. The adhesive channel 6103 is connected with the insertion slot 6101, and the inner diameter of the adhesive channel 6103 matches the outer diameter of the ablation needle 1 for the ablation needle. 1 passed through. The adhesive channel 6103 increases the contact area with the ablation needle 1 and the supporting force for the ablation needle 1, and also improves the fixation effect between the magnetophilic inner core 61 and the ablation needle 1.

Please refer to Figure 10. Under the high-speed and strong driving of the driving system 6, the delivery tube 272 may be bent, which affects the delivery function inside the delivery tube 272. Especially when the ablation needle 1 is a steam ablation needle 1, the delivery tube 272 Bending may lead to poor steam transportation. In order to avoid bending and other adverse effects on the delivery pipe 272 when the driving system 6 is driven at high speed and force, in some embodiments, the driving system 6 also includes a guide channel 6104. The guide channel 6104 is provided at the end of the magnetophilic inner core 61 facing the second end 602 , and the guide channel 6104 is connected with the insertion slot 6101 . The delivery tube 272 is passed through the guide channel 6104. The guide channel 6104 increases the contact area with the conveying tube 272, thereby increasing the support force for the conveying tube 272 and preventing the conveying tube 272 from being bent when it moves with the magnetophilic inner core 61.

Furthermore, the second end cap 662 may be provided with a reinforcing tube 2621 for the conveying pipe 272 to pass through. The reinforcing pipe 2621 can further enhance the supporting effect on the conveying pipe 272 and prevent the conveying pipe 272 from bending.

In some embodiments, when using the ablation needle driving system 6 of the present application, the operator first performs an initial reset operation, that is, pulling the pull rod 280 to retreat the magnetophilic inner core 61 to the position where it is adsorbed by the second magnet 652 and the second retaining ring. 642 is in the fitting position, the ablation needle 1 is in the withdrawal state, and the host count is 0; then the operator presses the switch to control the host to instantly release the high-voltage electricity in the capacitor to the drive coil 62, and drive the magnetophilia under the action of the magnetic field. The inner core 61 moves toward the first end 601 and is attracted by the first magnet 651 to a position that fits the first retaining ring 641. The ablation needle 1 pops out and is in the needle insertion state. After the capacitor is discharged, the control host immediately charges the capacitor to prepare for the next discharge. At the same time, the host counts 1. When the capacitor is discharged again, the magnetophilic inner core 61 moves to be adsorbed by the second magnet 652. At this time, it is in the needle withdrawal state, and the host counts is 2. Repeat this, and the host counts an odd number to know that the current ablation needle 1 is in the needle insertion state. When the host counts an even number, it is known that the current ablation needle 1 is in the withdrawal state. Through the initial reset and host counting, the control host or operator can know whether the current ablation needle 1 is in the needle advancement state or the needle withdrawal state.

In some embodiments, the driving system 6 further includes a first sensor (not shown in the figure) and/or a second sensor (not shown in the figure). The first sensor is arranged outside the coil support 610 and is located on the side of the pull rod 280 facing the first end 601. When the magnetophilic inner core 61 moves to be adsorbed by the first magnet 651, the first sensor senses the pull rod 280. The second sensor is arranged outside the coil support 610 and is located on the side of the pull rod 280 facing the second end 602. When the magnetophilic inner core 61 moves to be adsorbed by the second magnet 652, the second sensor senses the pull rod 280. By sensing the pull rod 280 with the first sensor and/or the second sensor, the current status of the ablation needle 1 can be determined.

Specifically, the first sensor and the second sensor can be set at the same time. By sensing the pull rod 280 through the first sensor and the second sensor, the position of the pull rod 280 can be directly determined, so that the control host does not need to count to determine whether the ablation needle 1 is at the needle insertion position or not. Needle withdrawal position. Specifically, when the space size is limited, only the second sensor can be provided. When the magnetophilic inner core 61 is in the position where it is attracted by the second magnet 652, that is, when the ablation needle 1 is in the needle withdrawal position, the pull rod 280 can trigger the second sensor. , the host computer can be controlled to know that the ablation needle 1 is in the needle withdrawal state, and based on the number of capacitor discharges, the position of the ablation needle 1 can be determined.

Specifically, the driving system 6 also includes a housing (not shown in the figure). The housing is provided outside the coil support 610 , and the first sensor and the second sensor can be provided on the inner wall of the housing. The first sensor may be any applicable sensor such as a photoelectric sensor, an infrared sensor, a micro switch or a Hall sensor. The second sensor may be any applicable sensor such as a photoelectric sensor, an infrared sensor, a micro switch or a Hall sensor.

Several specific implementations of the ablation needle driving system 6 are provided below:

Embodiment 1: The length of the coil support 610 is 28 mm, the length of the driving coil 62 is 18 mm, and the length of the magnetophilic inner core 61 is 16 mm. The first retaining ring 641 and the second retaining ring 642 are located on both sides of the coil support 610. At this time, the movement stroke of the magnetophilic inner core 61 is 12 mm. When the magnetophilic inner core 61 fits the second retaining ring 642, the magnetophilic inner core 61 The core 61 overlaps the drive coil 62 by 11 mm.

Embodiment 2: The coil support 610 is 28 mm long, and the driving coil 62 is 18 mm long. When a larger driving stroke is required, the size of the magnetic core 61 can be adjusted to a minimum of 5mm, at which time the driving stroke is 23mm. The first retaining ring 641 and the second retaining ring 642 are located on both sides of the coil support 610 .

Embodiment 3: The coil support 610 is 28 mm long, and the driving coil 62 is 18 mm long. When the required driving stroke is smaller, the areas corresponding to the inner cavity 611 of the first retaining ring 641 and the second retaining ring 642 can be extended into the inner cavity 611 of the coil bracket 610, or the length of the driving iron core can be directly increased.

A steam ablation system provided by this application may include the driving system 6 described in any of the above embodiments.

The above embodiment introduces the driving system 6 of the ablation needle 1 in detail, and other components of the steam ablation system will be described in detail below:

In order to facilitate the insertion of the introduction tube 7 into the patient's urethra, as shown in Figures 1 and 2, the introduction tube 7 includes an introduction tube body 71 and an introduction tube tip 72, wherein the introduction tube body 71 is screwed to the introduction tube tip 72, and The introduction tube tip 72 is sleeved on the outer periphery of the introduction tube body 71 , and a first cavity 711 is opened in the introduction tube body 71 . By threading the introduction tube tip 72 on the introduction tube body 71 , the resistance of the introduction tube 7 when inserted into the patient's urethra and other human tissues is reduced, and the introduction tube 7 is prevented from causing damage to the patient's urethra or other tissues. Preferably, the introduction tube body 71 and the introduction tube tip 72 have an interference fit, and the introduction tube body 71 and the introduction tube tip 72 are sleeve-connected. The mating length is about 6 mm, which further improves the stability of fixing the introduction tube body 71 and the introduction tube tip 72 , and also improves the sealing performance of the connection between the introduction tube body 71 and the introduction tube tip 72 . In this embodiment, it should be noted that the introduction tube 7 is made of a material with good biocompatibility and is inserted parallel to the patient's urethra during the treatment. The introduction tube tip 72 can have a conical structure, and the conical structure Smooth rounded transition at tip.

In addition, as shown in Figures 1 and 2, and Figures 11 and 12, the steam ablation system also includes an endoscope 8 and a handle (not shown in the figure), in which the introduction tube body 71 is fixed on the handle, and the introduction tube The main body 71 is also provided with a second cavity 712, which is spaced apart from the first cavity 711. The endoscope 8 includes a connected installation part and a working part. The installation part is installed on the handle, and the working part It can penetrate into the second cavity 712, and a lens is provided on the working part. The head of the ablation needle 1 can pass through the first cavity 711 and the second cavity 712 and extend out of the introduction tube 7, and the lens on the working part It is arranged directly opposite the head of the ablation needle 1, so that it is convenient for the lens of the endoscope 8 to observe the push-out and retraction actions of the ablation needle 1 relative to the introduction tube 7 and the steam device 2. In this embodiment, the viewing angle of the lens can be 30°. The mounting part needs to be coated with a certain amount of lubricant before being installed into the handle. After being installed, the outer shell of the handle is used to limit the axial position of the mounting part, and the endoscope 8 is used. The two sides of the upper light source interface implement circumferential limiting of the endoscope 8 relative to the handle.

Preferably, as shown in FIG. 12 , a gap is formed between the outer wall of the working part of the endoscope 8 and the cavity wall of the second cavity 712 so that the flushed physiological saline can flow through the gap to ensure that it can pass through the introduction tube 7 Irrigated saline is passed through the interstitial space to provide cleaning and irrigation to the tissue during insertion of the steam ablation system and during delivery of steam to the tissue. It should be noted that in this embodiment, since the second cavity 712 and the first cavity 711 are arranged at intervals, almost no steam can leak from the gap between the second cavity 712 .

In the prior art, during the interval of ablation treatment, the sterile water delivery device 3 stops delivering sterile water to the steam device 2, and the steam device 2 no longer generates steam, so that the pipelines in the steam device 2 inevitably generate Part of the condensation, because the volume of steam is reduced to the volume of water, will cause the ablation needle 1 to create a vacuum. This vacuum will suck the blood, tissue or other substances at the injection site from the urethra through the steam delivery port into the needle tip. When treatment is restarted, The substance ejects from the needle before new vapor is delivered to the tissue, affecting the effectiveness of the treatment. In addition, the substance may block the steam delivery site, resulting in uneven distribution of steam and thus affecting the effectiveness of the treatment. In order to solve the above problems in the prior art, the steam ablation system causes the sterile water delivery device 3 to input sterile water to the steam device 2 at a low speed during the treatment interval, so that the steam device 2 sprays a small amount of steam, so that the ablation needle 1 The pressure is maintained at a positive pressure to prevent substances from being inhaled into the needle. Therefore, the sterile water delivery device 3 needs to use different flow rates to inject sterile water during treatment and treatment intervals. Due to the different flow rates of injecting sterile water, the steam will be significantly increased again. The time of occurrence prolongs the steam response time of the next treatment and reduces the treatment efficiency.

In order to solve the above problems, as shown in Figures 1 and 2, the steam ablation system provided in this embodiment also includes a pressure relief device 4. The sterile water delivery device 3 can pass sterile water to the steam device 2 at a constant flow rate. When the ablation needle 1 is pushed out relative to the steam device 2 and the introduction tube 7 driven by the driving system 6, the steam discharged by the steam device 2 is discharged to the patient's prostate hyperplasia tissue through the ablation needle 1, thereby achieving thermal ablation of the tissue. When During the treatment interval, the ablation needle 1 is driven back by the driving system 6 relative to the steam device 2 and the introduction tube 7. The steam discharged by the steam device 2 can be discharged through the pressure relief device 4 to avoid excessive steam still being discharged through the ablation needle 1 and causing burns. patient. In addition, the arrangement of the pressure relief device 4 enables the sterile water delivery device 3 to always deliver sterile water to the steam device 2 at a constant flow rate during treatment and treatment intervals, thereby avoiding negative pressure at the ablation needle 1 during treatment intervals. The occurrence of this phenomenon also shortens the steam response time during the next treatment, allowing the ablation needle 1 to instantly generate steam for ablation during the next treatment, thereby improving treatment efficiency.

Specifically, in this embodiment, the sterile water delivery device 3 always supplies sterile water to the steam device 2 at a flow rate of 3.0 ml/min. The pressure relief device 4 can be a pressure relief valve, and the pressure of the pressure relief valve is about is 10psi. In addition, as shown in Figures 1 and 2, the steam ablation system also includes a waste liquid recovery device 5. The waste liquid recovery device 5 is connected to the pressure relief device 4. During the treatment interval, steam is continuously generated inside the steam device 2 to reach After the pressure relief value of the pressure relief valve is reached, the steam inside the steam device 2 can flow into the waste liquid recovery device 5 through the pressure relief valve.

The specific structure of the ablation needle 1 will now be described with reference to Figures 1 and 2. As shown in Figures 1 and 2, the ablation needle 1 is a single-lumen tube, and the ablation needle 1 includes a connected ablation needle main body 11 and an ablation needle tip. The ablation needle tip 12 is provided to facilitate the puncture action of the ablation needle 1 . Specifically, the ablation needle 1 can be made of PEEK material. The length of the ablation needle 1 is approximately 220 mm, and the inner and outer diameters of the entire ablation needle 1 are 0.76 mm and 1.27 mm respectively.

In order to facilitate the ablation needle 1 to extend out of the introduction tube 7, as shown in Figures 1 and 2, a perforation hole 713 is provided on the cavity wall of the introduction tube body 71, and the perforation hole 713 is located between the introduction tube body 71 and the introduction tube tip 72 At the connection point, the head of the ablation needle 1 is designed to be curved, and the bending angle is about 90°, so that the head of the ablation needle 1 can extend out of the introduction tube 7 through the perforation hole 713 in the pushed-out state. Specifically, in this embodiment, the extension length of the curved portion of the head of the ablation needle 1 is approximately 12 mm. It should be noted that in this embodiment, the diameter of the perforation hole 713 is larger than the outer diameter of the head of the ablation needle 1 , thereby ensuring that the ablation needle 1 can push out and retreat relative to the perforation hole 713 .

Since the penetration hole 713 is located at the connection and mating point between the introduction tube body 71 and the introduction tube tip 72 , the lens of the endoscope 8 is located at the connection and fit between the introduction tube body 71 and the introduction tube tip 72 , thereby ensuring that the lens of the endoscope 8 Being placed directly opposite the head of the ablation needle 1 also ensures that the endoscope 8 has enough space to observe the movement of the ablation needle 1 . Preferably, in this embodiment, the head of the ablation needle 1 is provided with a marking ring to facilitate observing the specific position of the head of the ablation needle 1 through the lens of the endoscope 8 .

In addition, a steam hole 111 is provided on the cavity wall of the ablation needle main body 11. When the ablation needle 1 is pushed out relative to the steam device 2, the steam device 2 opens the steam hole 111 so that the steam discharged by the steam device 2 is discharged through the steam hole 111; When the ablation needle 1 retracts relative to the steam device 2, the steam device 2 blocks the steam hole 111, so that the steam discharged by the steam device 2 can be discharged to the waste liquid recovery device through the pressure relief device 4. Set in 5.

Another embodiment of the present application describes the specific structure of the steam device 2 with reference to Figures 1 and 2. As shown in Figures 1 and 2, the steam device 2 includes a steam generating coil 21, a steam delivery pipe 22 and a heating coil 23. Among them, one end of the steam generating coil 21 is connected with the sterile water delivery device 3, and the head of the steam delivery tube 22 is open. The steam delivery tube 22 is inserted into the cavity inside the ablation needle 1, and the heating coil 23 surrounds it. Disposed on the outer periphery of the steam generating coil 21 , the heating coil 23 is used to heat the steam generating coil 21 so that the sterile water in the steam generating coil 21 is heated to generate steam and flows into the steam delivery pipe 22 . When the ablation needle 1 needs to perform thermal ablation on the patient's prostatic hyperplasia tissue, the ablation needle 1 is pushed out relative to the steam delivery tube 22. At this time, the portion of the ablation needle main body 11 with the steam hole 111 is away from the steam delivery tube 22, so that the steam delivery The tube 22 opens the steam hole 111, and the steam in the steam delivery tube 22 can be discharged through the head opening and then through the steam hole 111; when the ablation needle 1 retracts relative to the steam delivery tube 22, the steam delivery tube 22 is located at the main body of the ablation needle. 11 opens the chamber wall with the steam hole 111, so that the steam delivery pipe 22 blocks the steam hole 111. At this time, the ablation needle 1 will not discharge steam, the pressure relief device 4 is opened, and the steam inside the steam delivery pipe 22 can completely pass through the leakage. The pressure device 4 is discharged into the waste liquid recovery device 5.

Specifically, the head of the steam delivery tube 22 adopts a sloped isosceles trapezoidal structure with a slope angle of approximately 45°. When the ablation needle 1 retracts relative to the steam delivery tube 22, the head of the steam delivery tube 22 is exactly located at the main body of the ablation needle. 11 and the connection of the ablation needle tip 12. In addition, the steam delivery tube 22 is a single-lumen straight tube made of PEEK capillary tube. The inner and outer diameters of the steam delivery tube 22 are 0.50mm and 0.73mm respectively. The length of the steam delivery tube 22 Approximately 230mm. The heating coil 23 is an RF coil, and the heating power of the RF coil is between 10W and 1000W. The steam generating coil 21 is made of RW Inconel625 pipe or TW Inconel625 pipe. The inner diameter range of the steam generating coil 21 is 0.75mm～0.95mm. There is good electrical contact between adjacent pipe circles of the steam generating coil 21.

Preferably, as shown in Figure 14, a plurality of steam holes 111 are spaced on the cavity wall of the ablation needle main body 11. When the ablation needle 1 retracts relative to the steam delivery tube 22, the steam delivery tube 22 blocks each steam hole 111. . Specifically, the cavity wall of the ablation needle main body 11 is provided with three rows of steam hole groups along its circumferential direction, and each row of steam hole groups has four steam holes 111 spaced along its axial direction, so that the ablation needle main body 11 A total of 12 steam holes 111 are provided on the cavity wall. The diameter of each steam hole 111 is about 0.6 mm, which ensures the discharge of steam from the ablation needle 1 and ensures the treatment effect. It should be noted that in other embodiments, the specific design number and arrangement of the steam holes 111 can be limited according to specific needs.

Preferably, a temperature sensor is installed on the steam generating coil 21. The temperature sensor is used to detect the temperature at which the steam generating coil 21 is heated by the heating coil 23. In principle, the temperature of the steam generated in the steam generating coil 21 should be greater than 100°C. The temperature of the steam discharged from the steam hole of the ablation needle is 80-110°C, so that the tissue can be quickly heated to 60-80°C for ablation, which plays a therapeutic role. Specifically, the heating coil 23 performs heating according to the temperature value detected by the temperature sensor, thereby preventing the patient from being scalded due to excessive steam temperature. It should be noted that in this embodiment, the temperature measuring probe of the temperature sensor is electromagnetically shielded with a metal foil to prevent the temperature sensor probe from inductively heating itself under the action of the heating coil 23 .

Furthermore, in this embodiment, the steam delivery tube 22 has a clearance fit with the wall of the internal cavity of the ablation needle 1 , ensuring that the ablation needle 1 can be pushed out or retracted relative to the steam delivery tube 22 more smoothly, thereby reducing the cavity size of the ablation needle 1 The friction between the outer wall of the steam delivery pipe 22 and the outer wall of the steam delivery pipe 22. Specifically, the bilateral gap between the steam delivery tube 22 and the wall of the internal cavity of the ablation needle 1 is 0.03 mm.

In addition, as shown in Figures 1 and 2, the steam device 2 also includes a flexible connecting pipe 24. One end of the flexible connecting pipe 24 is connected to the steam generating coil 21 and the other end of the flexible connecting pipe 24 is connected to the steam delivery pipe 22. The sterile water delivered by the sterile water delivery device 3 flows into the steam generating coil 21 and is converted into steam, and then flows into the steam delivery pipe 22 through the flexible connecting pipe 24 . The steam generating coil 21 and the steam delivery pipe 22 are connected through a flexible connecting pipe 24 to avoid leakage at the connection during the operation of the ablation needle 1, ensuring the sealing of each connection and reducing the cost of each pipe. The difference in the inner diameter of the pipe avoids condensation due to changes in pipe volume.

In this embodiment, the steam device 2 further includes a sealing ring 25 , which is fixed on the cavity wall at the rear of the ablation needle 1 , and is sandwiched between the cavity wall of the ablation needle 1 and the outer wall of the steam delivery tube 22 between. By providing the sealing ring 25 , the steam discharged from the steam delivery pipe 22 into the cavity wall of the ablation needle 1 is prevented from being discharged from the rear end of the ablation needle 1 . Specifically, the sealing ring 25 can be a silicone sealing ring, and the silicone sealing ring and the outer wall of the steam delivery pipe 22 have an interference fit.

The structure of the steam ablation system provided by yet another embodiment of the present application is basically the same as that of the above-mentioned corresponding embodiment. The difference between the steam ablation system provided by this embodiment and the above-mentioned corresponding embodiment is that the specific structure of the steam device 2 is different.

As shown in Figures 15 to 17, the steam device 2 provided by this embodiment does not have a steam delivery pipe 22, but has a blocking ring 26, in which one end of the steam generation coil 21 is connected to the sterile water delivery device 3, The other end of the steam generating coil 21 is connected to the ablation needle 1. The heating coil 23 is arranged around the outer periphery of the steam generating coil 21. The heating coil 23 is used to heat the steam generating coil 21 so that the steam generating coil 21 discharges steam. , thereby passing the steam in the steam generating coil 21 into the cavity of the ablation needle 1, the blocking ring 26 is fixed inside the introduction tube 7, and the blocking ring 26 is sleeved on the outer periphery of the ablation needle 1, as shown in Figure 15 As shown in the figure, when the ablation needle 1 is pushed out relative to the blocking ring 26, the portion of the ablation needle main body 11 with the steam hole 111 is away from the blocking ring 26, the steam hole 111 is opened, and the steam in the cavity of the ablation needle 1 can pass through. Each steam hole 111 is discharged; as shown in Figures 16 and 17, when the ablation needle 1 retracts relative to the blocking ring 26, the blocking ring 26 is located at the cavity wall of the ablation needle main body 11 where the steam hole 111 is opened, so that The blocking ring 26 blocks each steam hole 111. At this time, the ablation needle 1 will not discharge steam. The ablation needle 1 can be connected to the pressure relief device 4. When the pressure relief device 4 is opened, the steam in the cavity of the ablation needle 1 can be completely discharged. All the waste liquid is discharged into the waste liquid recovery device 5 through the pressure relief device 4.

The structure of the steam ablation system provided by yet another embodiment of the present application is basically the same as that of the above-mentioned corresponding embodiment. The difference between the steam ablation system provided by this embodiment and the above-mentioned corresponding embodiment is that when the ablation needle 1 retracts relative to the steam delivery pipe 22 , a large amount of steam in the steam delivery pipe 22 is still discharged into the waste liquid recovery device 5 through the pressure relief device 4 , and a small amount of steam in the steam delivery pipe 22 can be discharged through the head of the ablation needle 1 .

Specifically, as shown in Figure 18, a vent hole 121 is provided on the cavity wall of the ablation needle tip 12. The aperture of the vent hole 121 is smaller than the aperture of the steam hole 111. When the ablation needle 1 is pushed out or retracted relative to the steam delivery tube 22, The vent holes 121 are all connected to the steam delivery pipe 22 , so that after the steam in the steam delivery pipe 22 can be discharged through the head opening, a small amount of steam can be discharged through the vent holes 121 . It should be noted that when the ablation needle 1 is retracted relative to the steam delivery tube 22, since the head of the steam delivery tube 22 is located exactly at the connection between the ablation needle main body 11 and the ablation needle tip 12, the steam delivery tubes 22 will not communicate with each other. The air hole 121 is blocked, and a large amount of steam in the steam delivery pipe 22 is still discharged into the waste liquid recovery device 5 through the pressure relief device 4. In this embodiment, the aperture range of the air vent 121 is 0.2 mm to 0.6 mm.

The steam ablation system provided by another embodiment of the present application has basically the same structure as the above-mentioned embodiment. The difference between the steam ablation system provided by this embodiment and the above-mentioned corresponding embodiment is:

As shown in Figure 1, a first exhaust hole 221 is provided on the wall of the steam delivery tube 22. When the ablation needle 1 is retracted relative to the steam delivery tube 22, one of the steam holes 111 is directly opposite to the first exhaust hole 221. The remaining steam holes 111 are blocked by the steam delivery pipe 22, so that a small amount of steam in the steam delivery pipe 22 can be discharged through the first exhaust hole 221 and the steam hole 111 connected to the first exhaust hole 221, and the steam A large amount of steam in the delivery pipe 22 is still discharged into the waste liquid recovery device 5 through the pressure relief device 4 .

It should be noted that in this embodiment, the steam hole 111 directly connected to the first exhaust hole 221 is the steam hole 111 closest to the ablation needle tip 12. In other embodiments, the first exhaust hole 111 is the steam hole 111 closest to the ablation needle tip 12. 221 can also be directly connected to the steam holes 111 in other locations.

The structure of the steam ablation system provided by yet another embodiment of the present application is basically the same as that of the above-mentioned corresponding embodiment. The difference between the steam ablation system provided by this embodiment and the above-mentioned corresponding embodiment is that:

As shown in Figure 20, a vent hole 121 is provided on the cavity wall at the connection between the ablation needle main body 11 and the ablation needle tip 12, and a second exhaust hole 222 is provided on the cavity wall of the head of the steam delivery tube 22. When ablation When the needle 1 retracts relative to the steam delivery pipe 22, the second exhaust hole 222 is directly connected to the vent hole 121, so that a small amount of steam in the steam delivery pipe 22 can be discharged through the second exhaust hole 222 and the vent hole 121 in sequence. A large amount of steam in the steam delivery pipe 22 is still discharged into the waste liquid recovery device 5 through the pressure relief device 4 .

Preferably, as shown in FIG. 21 , the cavity wall at the connection point between the ablation needle main body 11 and the ablation needle tip 12 is provided with a plurality of vent holes 121 spaced along its circumferential direction, and each vent hole 121 is provided with a corresponding second vent hole 121 . Exhaust holes 222. In this embodiment, two ventilation holes 121 are provided at intervals.

In addition, in the steam ablation system, during the treatment interval, most of the hot steam flows into the waste liquid recovery device through the pressure relief device 4. The temperature of the accessible surface of the pressure relief pipe used by the waste liquid recovery device is as high as about 80-100°C. ℃, it is easy to cause burns to the patient or the surgeon during the operation, bringing unnecessary harm. In view of this, an embodiment of the present application provides a pressure relief anti-scalding pipe 310 for use in the above-mentioned steam ablation system. The pressure relief anti-scalding pipe 310 includes a pipeline body 311 and an anti-scalding structure. The pipeline main body 311 is connected with the steam ablation system. The anti-scalding structure is provided on the outer periphery of the pipeline main body 311 to prevent the pipeline main body 311 from scalding the user. Specifically, the anti-scalding structure includes a heat dissipation rib 312; one or more heat dissipation ribs 312 are provided, and the heat dissipation rib 312 is provided on the outer wall of the pipeline main body 311.

The pipeline main body 311 is a tubular structure. The pipeline main body 311 is connected with the steam generating coil 21 in the steam ablation system. The hot steam in the steam generating coil 21 can enter the pipeline main body 311; and any adjacent heat dissipation ribs There is a gap between the plates 312 to form a heat dissipation cavity 313. The heat in the pipeline body 311 is dissipated through the heat dissipation ribs 312 and dissipated in the heat dissipation cavity 313, effectively reducing the surface temperature of the pipeline body 311 and avoiding burns.

The pressure relief and anti-scalding pipe 310 provided in this embodiment is used in the steam ablation system. It is connected to the steam generating coil 21 in the steam ablation system through the pipeline main body 311. The hot steam in the steam generating coil 21 enters the pipeline main body 311. , since one or more heat dissipation ribs 312 are provided on the outer wall of the pipeline main body 311, the gap between the heat dissipation ribs 312 forms a heat dissipation cavity 313, and the heat of the pipeline main body 311 is dissipated through the surface of the heat dissipation ribs 312. The heat is dissipated in the cavity 313, thereby reducing the temperature of the surface of the pipeline main body 311, and the heat dissipation ribs 312 can reduce the contact area between the skin and the pipeline main body 311, thereby effectively avoiding burns to the operator or the patient, and easing the current There is a technical problem in the art that during the treatment interval, steam flows into the waste liquid recovery device through the pressure relief device 4, resulting in a high surface temperature of the entire pressure relief pipeline, which easily burns the patient or the operator.

In the first embodiment, as shown in Figures 22 and 23, a plurality of heat dissipation ribs 312 are connected in sequence. The plurality of heat dissipation ribs 312 can also be integrally formed to form an integral heat dissipation rib 312 in a spiral shape. is arranged on the outer wall of the pipeline main body 311, so that a spiral heat dissipation rib 312 is formed on the outer wall of the pipeline main body 311, and the gap between the spiral heat dissipation ribs 312 forms a heat dissipation cavity 313. The heat is released into the external environment through the surface of the heat dissipation plate in the heat dissipation cavity 313, thereby reducing the surface temperature of the pipeline body 311.

In the second embodiment, as shown in FIGS. 24 and 25 , a plurality of heat dissipation ribs 312 are spaced apart along the outer circumferential direction of the pipeline main body 311 , and the plurality of heat dissipation ribs 312 are all facing the center of the pipeline main body 311 , the heat dissipation ribs 312 are arranged in a M-shape on the outer circumferential surface of the pipeline main body 311, and a heat dissipation cavity 313 is formed between two adjacent heat dissipation ribs 312.

In the third embodiment, as shown in FIGS. 26 and 27 , the heat dissipation ribs 312 are arranged in an annular shape, and a plurality of heat dissipation ribs 312 are spaced apart along the axial direction of the pipeline body 311 , and two adjacent heat dissipation ribs are A heat dissipation cavity 313 is formed between 312 .

It should be noted that in the above-mentioned first embodiment, second embodiment and third embodiment, the heat dissipation rib 312 and the pipeline main body 311 are an integral structure.

In the fourth embodiment, as shown in Figures 28 and 29, the pressure relief anti-scalding pipe 310 also includes a heat insulation pipeline 314; the heat insulation pipeline 314 is sleeved on the pipeline main body 311, and a plurality of heat dissipation ribs 312 They are all connected to the inner wall of the insulated pipeline 314.

Specifically, on the basis of the first embodiment, the second embodiment or the third embodiment, a heat-insulating pipeline 314 may also be provided. The inner diameter of the heat-insulating pipeline 314 is larger than that of the pipeline main body 311 and the heat dissipation rib 312 . The outer diameter allows the heat insulating pipe 314 to be sleeved outside the pipe body 311. The end of the heat dissipation rib 312 away from the heat dissipation pipe is connected to the heat insulating pipe 314, so that the heat insulating pipe 314, the heat dissipation rib 312 and the pipe The main body of the pipeline 311 forms a whole, and the operator and the patient can only touch the insulated pipeline 314, so the operator and the patient will not be burned.

As shown in Figure 1, a steam ablation system provided by yet another embodiment of the present application includes the pressure relief and anti-scalding tube 310 in any of the above embodiments.

Further, the steam ablation system also includes an ablation needle 1, a flexible connecting tube 24, and a steam generating coil 21; both ends of the flexible connecting tube 24 are connected to the ablation needle 1 and the steam generating coil 21 respectively, and the pipeline main body 311 is connected to the flexible tube 21. Pipe 24 is connected.

Specifically, the steam generating coil 21 is connected to the ablation needle 1 through the flexible connecting tube 24. The hot steam in the steam generating coil 21 enters the ablation needle 1 through the flexible connecting tube 24, and during the pressure relief process, the flexible connection The hot steam in the pipe 24 enters the pipe body 311, and the hot steam is discharged through the pipe body 311.

In an optional embodiment, the steam ablation system also includes an introduction tube 7; the side wall of the introduction tube 7 is provided with an opening, and the end of the ablation needle 1 away from the flexible connecting tube 24 is provided with a steam ejection part, and the steam ejection part extends Entering the introduction tube 7, the steam ejection part can pass through the opening. When ablation is required, the steam ejection part extends from the opening, and hot steam is ejected from the porous structure of the steam ejection part to ablate the patient's tissue. , after the ablation is completed, the steam ejection part retracts into the introduction tube 7 .

In addition, the end of the introduction tube 7 has an introduction tube tip 72. The introduction tube tip 72 has a tapered structure, which effectively reduces the resistance encountered when the introduction tube tip 72 is inserted into the human body, making it more convenient to insert the introduction tube 7 into the human body.

Moreover, an endoscope 8 is also provided in the introduction tube 7 , and the introduction tube 7 also includes one or more inner cavities, the size of which is designed to be suitable for accommodating the endoscope 8 or a camera during use. To provide additional observation and feedback to the operator, a marking ring can also be set on the steam ejection part of the ablation needle 1, and the specific position of the ablation needle 1 inserted into the tissue to be ablated after extending out of the introduction tube 7 is observed through the endoscope 8 or camera. correct.

In an optional embodiment, the steam ablation system further includes a driving system 6 ; the driving force generated by the driving system 6 acts on the ablation needle 1 , and the driving system 6 is used to drive the ablation needle 1 to move along the axis of the introduction tube 7 . In an optional embodiment, the steam ablation system also includes a heating part; the heating part is set outside the steam generating coil 21, and the heating part is used to heat the steam generating coil 21. The heating part is specifically configured as a heating coil 23. After power is turned on, the steam generating coil 21 is heated, and the sterile water in the steam generating coil 21 is heated, thereby causing the sterile water to boil to generate steam, and the hot steam enters the flexible connecting pipe 24 .

In the steam ablation system provided in this embodiment, the driving system 6 drives the steam ejection part of the head of the ablation needle 1 to extend from the opening on the side wall of the introduction pipe 7, and the hot steam in the steam generating coil 21 passes through the flexible connecting pipe in sequence. 24 and the ablation needle 1 are ejected from the steam ejection part to ablate the patient. After the ablation is completed, the driving system 6 drives the ablation needle 1 to move, so that the steam ejection part returns to the introduction tube 7, and the pipe body 311 When the pressure relief device 4 is opened, the hot steam in the flexible connecting tube 24 enters the pipeline main body 311, and the hot steam is released through the pipeline main body 311 to release part of the steam in the flexible connecting tube 24 during the ablation interval, which can avoid Steam damages normal tissue when switching treatment sites.

Another embodiment of the present application provides a steam ablation system control method for use in the steam ablation system. The steam ablation system includes a steam device 2, a sterile water delivery device 3, a pressure relief device 4 and an ablation needle 1. The steam ablation system control method The method includes the following steps:

After starting the steam ablation system, the sterile water delivery device 3 supplies sterile water to the steam device 2 at a constant flow rate, so that the steam device 2 discharges steam; when the ablation needle 1 performs thermal ablation on the tissue, the ablation needle 1 The steam device 2 is pushed out, and the steam discharged by the steam device 2 is discharged through the ablation needle 1; when the ablation needle 1 is in the treatment gap, the ablation needle 1 retreats relative to the steam device 2, and all the steam discharged by the steam device 2 is discharged through the pressure relief device 4 or steam The steam discharged from the device 2 is partially discharged through the pressure relief device 4.

The steam ablation system control method provided by this application allows the ablation needle 1 to discharge steam during the treatment period to achieve thermal ablation of the tissue. During the treatment interval, it can avoid excessive steam being discharged through the ablation needle and scalding the patient. In addition, the arrangement of the pressure relief device 4 enables the sterile water delivery device 3 to always deliver sterile water to the steam device 2 at a constant flow rate during treatment and treatment intervals, thus avoiding the phenomenon of negative pressure at the ablation needle site during treatment intervals. The occurrence also reduces the steam response time during the next treatment, allowing the ablation needle 1 to instantly generate steam for ablation during the next treatment, thereby improving treatment efficiency.

The steam ablation system control method provided in this application can be adapted to the steam ablation system in any of the above embodiments, and will not be described again here.

The above descriptions are only embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present application, or directly or indirectly applied to other related technologies fields are equally included in the scope of patent protection of this application.

Claims

An ablation needle driving system, including:

An ablation needle fixation device, the ablation needle fixation device is used to fix the ablation needle;

A driving device drives the ablation needle fixing device to move to drive the ablation needle to move.
The drive system of claim 1, comprising:

The ablation needle fixation device is a magnetophilic inner core;

The driving device includes a driving coil surrounding the magnetophilic inner core. The driving coil is energized to attract the magnetophilic inner core to drive the magnetophilic inner core to move relative to the driving coil.
The drive system of claim 2, wherein the drive system includes:

Coil holder, an inner cavity is formed in the coil holder, and the inner cavity has a first end and a second end oppositely arranged along the first direction; the magnetophilic inner core is movable along the first direction and is arranged on the The inner cavity; the driving coil is wound around the outside of the coil bracket, and the driving coil is energized to attract the magnetophilic inner core to provide the magnetophilic inner core with a force toward the first end or the second end. The power to move.
The drive system of claim 3, wherein the drive system further includes:

A first retaining ring is provided at the end of the coil bracket close to the first end;

A second retaining ring is provided at the end of the coil bracket close to the second end;

A first magnet, disposed on the side of the first retaining ring facing away from the magnetophilic inner core;

The second magnet is disposed on the side of the second retaining ring facing away from the magnetophilic inner core.
The driving system according to claim 4, wherein the area of the first retaining ring corresponding to the inner cavity can extend into the inner cavity; and the area of the second retaining ring corresponding to the inner cavity can extend toward the inner cavity. extending within the lumen.
The drive system according to claim 4 or 5, comprising:

A first end cover is provided on the side of the first retaining ring facing away from the coil support, and the first magnet is located in the first end cover;

A second end cover is provided on the side of the second retaining ring facing away from the coil support, and the second magnet is located in the first end cover.
The driving system according to any one of claims 4 to 6, wherein moving the magnetophilic inner core toward the first end is a direction for driving the ablation needle to enter the needle, and between the magnetophilic inner core and When the second retaining ring is attached, the magnetophilic inner core at least partially overlaps the driving coil.
The driving system according to any one of claims 3 to 7, wherein the driving coil is a unidirectional coil and is formed by a single coil wound around the outside of the coil bracket.
The driving system according to any one of claims 3 to 8, wherein in the first direction, the driving coil is centrally arranged on the coil support or is arranged biased toward one end.
The drive system according to any one of claims 3 to 8, comprising:

An ablation needle is inserted into the magnetophilic inner core and extends from the first end of the inner cavity to the outside of the coil holder;

A delivery tube is connected to the ablation needle and extends from the second end of the inner cavity to the outside of the coil holder.
The driving system according to claim 10, wherein an insertion slot is formed in the magnetophilic inner core along the first direction, and the ablation needle is inserted into the insertion slot, and the magnetophilic inner core is inserted into the insertion slot. A glue-containing groove is also provided on the surface of the inner core, and the glue-containing groove is connected to the plug-in groove.
The driving system according to claim 11, further comprising: an adhesive channel disposed at an end of the magnetophilic inner core facing the first end, the adhesive channel being connected to the plug-in slot, and The inner diameter of the adhesive channel matches the outer diameter of the ablation needle, allowing the ablation needle to pass through.
The driving system according to claim 11 or 12, further comprising: a guide channel disposed at the end of the magnetophilic inner core facing the second end, the guide channel being connected to the insertion slot, the The conveying pipe runs through the guide channel.
The driving system according to any one of claims 3 to 13, wherein the inner wall of the coil support has a plurality of support ribs arranged at intervals and extending along the first direction.
The drive system according to any one of claims 4 to 14, further comprising: a pull rod disposed on the magnetophilic inner core and extending from the second end of the inner cavity to the coil outside the bracket.
The drive system of claim 15, comprising:

A first sensor is arranged outside the coil support and is located on the side of the pull rod facing the first end. When the magnetophilic inner core moves to the first retaining ring, the first sensor senses the pull rod; and / or,

The second sensor is arranged outside the coil support and is located on the side of the pull rod facing the second end. When the magnetophilic inner core moves to the second retaining ring, the second sensor senses the pull rod.
A steam ablation system, wherein the steam ablation system includes the drive system of any one of claims 1-16.
A pressure relief and anti-scalding pipe used in a steam ablation system, wherein the pressure relief and anti-scalding pipe includes a pipeline body and an anti-scalding structure;

The pipeline main body is connected with the steam ablation system;

The anti-scalding structure is arranged on the outer periphery of the pipeline main body to prevent the pipeline main body from scalding the user.
The pressure relief anti-scalding pipe according to claim 18, wherein the anti-scalding structure includes a heat dissipation rib plate, and the heat dissipation rib plate is provided with There are one or more, and the heat dissipation ribs are arranged on the outer wall of the pipeline main body to reduce the surface temperature of the pipeline main body.
The pressure relief anti-scalding pipe according to claim 18 or 19, wherein the pipeline main body is connected to the steam generating coil in the steam ablation system; there is a gap between any adjacent heat dissipation ribs, Form a heat dissipation cavity.
The pressure relief anti-scalding pipe according to claim 20, wherein a plurality of the heat dissipation ribs are connected in sequence and arranged in a spiral shape on the outer wall of the pipeline main body.
The pressure relief anti-scalding pipe according to claim 20, wherein a plurality of the heat dissipation ribs are spaced apart along the outer circumferential direction of the pipeline body, and the plurality of heat dissipation ribs are all facing the pipeline. The center of the subject.
The pressure relief anti-scalding pipe according to claim 20, wherein the heat dissipation ribs are arranged in an annular shape, and a plurality of the heat dissipation ribs are spaced apart along the axial direction of the pipeline body.
The pressure relief and anti-scalding pipe according to any one of claims 19 to 23, wherein the pressure relief and anti-scalding pipe further includes a heat-insulating pipeline; the heat-insulating pipeline is sleeved on the pipeline main body, and The plurality of heat dissipation ribs are connected to the inner wall of the heat insulation pipeline.
A steam ablation system, wherein the steam ablation system includes the pressure relief anti-scalding tube according to any one of claims 18-24.
The steam ablation system according to claim 25, wherein the steam ablation system includes an ablation needle, a flexible connecting tube and a steam generating coil; both ends of the flexible connecting tube are connected to the ablation needle and the steam generating coil respectively. The coiled pipes are connected, and the pipeline main body is connected with the flexible connecting pipe.
The vapor ablation system of claim 26, wherein:

The steam ablation system also includes an introduction tube;

An opening is provided on the side wall of the introduction tube, and a steam ejection part is provided at the end of the ablation needle away from the flexible connecting tube. The steam ejection part extends into the introduction tube, and the steam ejection part extends into the introduction tube, and the steam ejection part extends into the introduction tube. The outlet can extend in or out through the opening.
The steam ablation system according to claim 27, wherein the steam ablation system further includes a driving member; the driving force generated by the driving member acts on the ablation needle, and the driving member is used to drive the ablation needle. Move along the axis of the introduction tube.
The steam ablation system according to any one of claims 26 to 28, wherein the steam ablation system further includes a heating part; the heating part is sleeved outside the steam generating coil, and the heating part is used for heating The steam generating coil.
A steam ablation system, including:

steam device;

a sterile water delivery device configured to pass sterile water to the steam device at a constant flow rate to cause the steam device to discharge steam;

A pressure relief device and an ablation needle, the ablation needle can be pushed out or retracted relative to the steam device; when the ablation needle is pushed out relative to the steam device, the steam discharged by the steam device is discharged through the ablation needle ; When the ablation needle is retracted relative to the steam device, the steam discharged by the steam device can be discharged through the pressure relief device.
The steam ablation system according to claim 30, wherein a steam hole is provided on the cavity wall of the ablation needle, and when the ablation needle is pushed out relative to the steam device, the steam device opens the steam hole to The steam discharged by the steam device is discharged through the steam hole; when the ablation needle is retracted relative to the steam device, the steam device blocks the steam hole, so that all the steam discharged by the steam device The steam can be discharged through the pressure relief device.
The vapor ablation system of claim 31, wherein the vapor device includes:

A steam generating coil, one end of the steam generating coil is connected to the sterile water delivery device, and the other end is connected to the ablation needle;

a heating coil disposed around the outer periphery of the steam generating coil and configured to heat the steam generating coil so that the steam generating coil discharges the steam; and

A blocking ring is set on the outer periphery of the ablation needle;

When the ablation needle is pushed out relative to the blocking ring, the blocking ring opens the steam hole; when the ablation needle is retracted relative to the blocking ring, the blocking ring blocks the steam hole. .
The vapor ablation system of claim 31, wherein the vapor device includes:

A steam generating coil, one end of which is connected to the sterile water delivery device;

A steam delivery tube and a heating coil. The head of the steam delivery tube is open. The steam delivery tube is inserted into the cavity inside the ablation needle. The steam delivery tube is connected to the pressure relief device. , the heating coil is arranged around the outer periphery of the steam generating coil, and is configured to heat the steam generating coil, so that the steam generating coil generates steam and passes it into the steam delivery pipe;

When the ablation needle is pushed out relative to the steam delivery tube, the steam delivery tube opens the steam hole; when the ablation needle is retracted relative to the steam delivery tube, the steam delivery tube blocks the steam hole. .
The steam ablation system according to claim 33, wherein the steam delivery tube and the wall of the internal cavity of the ablation needle have a clearance fit.
The steam ablation system according to claim 33, wherein the steam device further includes: a flexible connecting pipe, one end of the flexible connecting pipe is connected to the steam generating coil, and the other end is connected to the steam delivery pipe. The connection is open.
The steam ablation system according to claim 33, wherein the steam device further includes: a sealing ring, fixed on the cavity wall of the tail of the ablation needle, and sandwiched between the cavity wall of the ablation needle and the steam between the outer walls of the delivery pipe.
The steam ablation system according to any one of claims 31 to 36, wherein a plurality of steam holes are spaced on the cavity wall of the ablation needle, and when the ablation needle is retracted relative to the steam device, The steam device blocks each of the steam holes.
The steam ablation system according to any one of claims 33 to 36, wherein a plurality of steam holes are spaced on the cavity wall of the ablation needle, and a first row of steam holes is opened on the wall of the steam delivery tube. When the ablation needle is retracted relative to the steam delivery tube, at least one of the steam holes is directly connected to the first exhaust hole, and the remaining steam holes are sealed by the steam delivery tube. Blocking.
The steam ablation system according to any one of claims 33 to 36, wherein the cavity wall of the ablation needle is also provided with a ventilation hole, and when the ablation needle is pushed out or retracted relative to the steam delivery tube, the ventilation hole The air holes are all connected with the steam delivery pipe.
The vapor ablation system according to any one of claims 30 to 36, wherein the vapor ablation system further includes:

A waste liquid recovery device is connected with the pressure relief device and is configured to collect the steam discharged by the pressure relief device.
The steam ablation system according to any one of claims 30 to 36, wherein the steam ablation system further includes:

A driving system configured to drive the ablation needle to push out or retract relative to the steam device.
The steam ablation system according to claim 41, wherein the driving system adopts the driving system according to any one of claims 1-16.
The vapor ablation system according to any one of claims 30 to 42, wherein the vapor ablation system further includes:

An introduction tube, a first cavity and a second cavity are spaced inside the introduction tube, the ablation needle is movably inserted into the first cavity, and the head of the ablation needle can pass through the first cavity. The first cavity and the second cavity extend out of the introduction tube; and

An endoscope is inserted into the second cavity, and the lens of the endoscope is positioned directly opposite the head of the ablation needle.
The vapor ablation system of claim 43, wherein the head of the ablation needle is provided with a marking ring.
The steam ablation system of claim 43, wherein a gap is formed between the endoscope and the cavity wall of the second cavity so that flushed physiological saline can flow through the gap.
A steam ablation system, including:

steam device;

a sterile water delivery device configured to pass sterile water to the steam device at a constant flow rate to cause the steam device to discharge steam; and

Ablation needle, a steam hole is provided on the cavity wall of the ablation needle, and the ablation needle can be pushed out or retracted relative to the steam device; when the ablation needle is pushed out relative to the steam device, the steam device opens the The steam hole is provided so that the steam discharged by the steam device is discharged through the steam hole; when the ablation needle is retracted relative to the steam device, the steam device blocks the steam hole.
The vapor ablation system of claim 46, wherein the vapor device includes:

A steam generating coil, one end of the steam generating coil is connected to the sterile water delivery device, and the other end is connected to the ablation needle;

a heating coil disposed around the outer periphery of the steam generating coil and configured to heat the steam generating coil so that the steam generating coil discharges the steam; and

A blocking ring is set on the outer periphery of the ablation needle;

When the ablation needle is pushed out relative to the blocking ring, the blocking ring opens the steam hole; when the ablation needle is retracted relative to the blocking ring, the blocking ring blocks the steam hole. .
The vapor ablation system of claim 46, wherein the vapor device includes:

A steam generating coil, one end of which is connected to the sterile water delivery device;

A steam delivery tube and a heating coil. The head of the steam delivery tube is open. The steam delivery tube is inserted into the cavity inside the ablation needle. The heating coil is surrounded by the steam generation coil. The outer periphery is configured to heat the steam generating coil so that the steam generating coil generates steam and passes it into the steam delivery pipe;

When the ablation needle is pushed out relative to the steam delivery tube, the steam delivery tube opens the steam hole; when the ablation needle is retracted relative to the steam delivery tube, the steam delivery tube blocks the steam hole. .
A steam ablation system control method, used in the steam ablation system, the steam ablation system includes a steam device, a sterile water delivery device, a pressure relief device and an ablation needle, wherein the steam ablation system control method includes the following steps:

After starting the steam ablation system, the sterile water delivery device supplies sterile water to the steam device at a constant flow rate, so that the steam device discharges steam;

When the ablation needle performs thermal ablation on tissue, the ablation needle is pushed out relative to the steam device, and the steam discharged by the steam device is discharged through the ablation needle; when the ablation needle is in the treatment gap, the ablation needle is The ablation needle is retracted relative to the steam device, and all the steam discharged by the steam device is discharged through the pressure relief device or part of the steam discharged by the steam device is discharged through the pressure relief device.