Flexible puncture structure and steam ablation system

Abstract

The invention relates to the technical field of steam ablation, and provides a flexible puncture structure and a steam ablation system.The flexible puncture structure comprises a rear-end elastic tube, a far-end head, a puncture needle and a screw, the far-end head and the rear-end elastic tube are connected to form a cavity channel, and the far-end head is provided with an extending hole communicated with the cavity channel; the puncture needle is movably arranged in the cavity channel, and a steam channel is arranged in the puncture needle; the screw rod comprises a driving section and a bending section which are connected, at least part of the screw rod is arranged in the cavity channel, the screw rod and the puncture needle are arranged in parallel, the driving section is connected with the puncture needle through a connecting piece, the screw rod rotates to enable the connecting piece to move so as to drive the puncture needle to stretch out of the stretching hole or retract into the cavity channel, and the bending section can be bent and deformed. And the screw rotates to drive the connecting piece to slide along the far end, so that the puncture needle relatively extends out of or retracts back from the extension hole, and the puncture action is completed. The rear-end elastic tube and the bent section of the screw are suitable for bending deformation, the bending capacity is high, and the device can easily reach the deep position of the human body, so that flexible transmission puncture is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam ablation, and in particular to a flexible puncture structure and a steam ablation system. Background Art

[0002] Thermal steam ablation is a minimally invasive, safe and highly effective treatment method. This method heats sterile water into high-temperature steam, which is then injected into the diseased tissue through a special needle. The high-temperature steam is used to inactivate the diseased tissue, causing it to undergo apoptosis and necrosis and be absorbed by the human body, thereby achieving the corresponding therapeutic effect.

[0003] In the related art, the needle outlet structure of the thermal steam ablation device is a rigid structure that cannot be bent and is not flexible, and is not suitable for the treatment of natural cavities in the human body with various complex curved shapes. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a flexible puncture structure, which aims to achieve flexible transmission puncture.

[0005] The present invention also provides a steam ablation system.

[0006] The flexible puncture structure according to the first aspect of the present invention comprises: Rear elastic tube; A distal head, the distal head is connected with the rear elastic tube to form a cavity channel, and the distal head is provided with a protruding hole communicating with the cavity channel; A puncture needle, the puncture needle is movably disposed in the cavity channel, and a steam channel is provided in the puncture needle; A screw rod, the screw rod comprising a connected driving section and a bending section, at least a portion of the screw rod is disposed in the cavity channel and arranged in parallel with the puncture needle, the driving section is connected to the puncture needle through a connecting piece, the screw rod is rotated to move the connecting piece, thereby driving the puncture needle to extend out of the extension hole or retract into the cavity channel, and the bending section can be bent and deformed.

[0007] According to the flexible puncture structure of the embodiment of the present invention, the puncture part is sent into the corresponding position of the patient's body through the endoscope instrument channel, and then the driving part is operated to drive the puncture needle to perform the puncture action. A steam channel is provided in the puncture needle for releasing steam, so that the hot steam enters the lesion along the steam channel to ablate the tissue. The distal head and the rear elastic tube are connected to form a cavity channel together, which supports and protects the internal components. The puncture needle can be extended through the extension hole on the distal head for puncture. The driving section of the screw is connected to the puncture needle through a connecting piece. During operation, the screw rotates under the drive of the power source, driving the connecting piece to slide along the distal head, thereby making the puncture needle extend or retract relatively from the extension hole to complete the puncture action. The rear elastic tube and the bending section of the screw are suitable for bending and deformation, and have strong bending ability, and can easily reach deep into the human body, thereby realizing flexible transmission puncture.

[0008] According to one embodiment of the present invention, one end of the driving section away from the bending section is rotatably connected to the distal head, the driving section is provided with an external thread, the connecting piece is fixedly connected to the puncture needle, the connecting piece is threadedly connected to the driving section, and when the driving section rotates, the connecting piece moves along the driving section.

[0009] According to an embodiment of the present invention, the distal head is provided with a fixing groove, and one end of the driving section away from the bending section is rotatably inserted into the fixing groove.

[0010] According to one embodiment of the present invention, the inner wall of the distal head is provided with at least one slide groove, the extension direction of the slide groove is parallel to the extension direction of the puncture needle, and the connecting piece is provided with a slider corresponding to each slide groove, and the slider is accommodated in the slide groove and slides along the slide groove.

[0011] According to an embodiment of the present invention, the inner wall of the distal head is provided with two slide grooves, the two slide grooves are symmetrically arranged, the connecting member is protrudingly provided with two sliders, and each slider is slidably arranged in one slide groove.

[0012] According to one embodiment of the present invention, the distal tip comprises: A front end fixing seat, wherein the front end fixing seat is provided with the extension hole; A front elastic tube, one end of which is connected to an end of the front fixing seat away from the extension hole; An intermediate fixing seat, wherein the intermediate fixing seat is connected to one end of the front end elastic tube away from the front end fixing seat, the intermediate fixing seat is connected to the rear end elastic tube, a telescopic space is formed between the intermediate fixing seat and the front end fixing seat, the driving section is threadedly connected to the intermediate fixing seat, the connecting piece is respectively fixedly connected to the driving section and the puncture needle, and when the driving section rotates, it is suitable for driving the connecting piece to move back and forth along the telescopic space.

[0013] According to an embodiment of the present invention, the front elastic tube is coated with a resin protective layer.

[0014] According to an embodiment of the present invention, the rear end elastic tube is coated with a resin protective layer.

[0015] According to an embodiment of the present invention, one end of the puncture needle extending out of the extension hole is provided with a plurality of small holes communicating with the steam channel.

[0016] The steam ablation system according to the second embodiment of the present invention comprises a puncture drive device and the above-mentioned flexible puncture structure, wherein the puncture drive device is connected to the screw rod to drive the screw rod to rotate.

[0017] The steam ablation system according to the embodiment of the present invention includes the above-mentioned flexible puncture structure, and thus has all the technical effects of the above-mentioned flexible puncture structure, which will not be described in detail here.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a cross-sectional view of a flexible puncture structure provided by an embodiment of the present invention.

[0021] Figure 2 It is a cross-sectional view of the flexible puncture structure provided by an embodiment of the present invention.

[0022] Figure 3 It is a cross-sectional view of another embodiment of the flexible puncture structure provided by an embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the steam ablation system provided in an embodiment of the present invention.

[0024] Reference numerals: 1. Human-computer interaction input device; 2. Control system; 3. Sterile water device; 4. Sterile water driving component; 5. Heating unit; 6. Flexible puncture structure; 7. Puncture driving device; 601. Distal head; 6011. Fixing groove; 6012. Extension hole; 6013. Slide groove; 602. Puncture needle; 6021. Small hole; 603. Connector; 6031. Sliding block; 604. Rear elastic tube; 605. Resin protective layer; 606. Screw; 6061. Driving section; 6062. Bending section; 801. Front fixing seat; 803. Front elastic tube; 805. Middle fixing seat; 807. Telescopic space. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] Among the existing treatment technologies for pancreatic cancer, surgical treatment is a method of removing the diseased tissue and its surrounding related tissues through surgical means to completely remove the lesions from the human body. This method can cure the disease in the early stages of the disease, but this method not only requires open surgery, which is very traumatic to the patient, but also usually requires the removal of some surrounding tissues, such as the duodenum, gallbladder, bile duct, lymph nodes, spleen, etc. For those with larger tumors, a complete pancreatectomy is required, which greatly affects the patient's quality of life after surgery.

[0031] Radiotherapy is an important treatment for pancreatic cancer, especially the combination of radiotherapy and chemotherapy, which is currently the preferred treatment for locally advanced pancreatic cancer. However, because pancreatic cancer is highly resistant to radiotherapy and adjacent organs have poor tolerance to radiation, the dose control requirements for radiotherapy are high. If low-dose, high-frequency radiotherapy is used, frequent treatment is required, which affects the patient's normal life.

[0032] In view of the above problems, the present invention provides a flexible puncture structure 6 and a steam ablation system. This method transmits hot steam to the lesion through a flexible puncture needle 602 under the guidance of an endoscope, which can achieve precise control without causing damage to surrounding normal tissues. The flexible puncture structure 6 can directly reach the lesion through the narrow channel of the endoscope, and the patient does not need to undergo a surgical operation and a long postoperative recovery process, and can be discharged quickly after treatment.

[0033] like Figure 1As shown, the flexible puncture structure 6 according to the embodiment of the first aspect of the present invention includes a rear elastic tube 604, a distal head 601, a puncture needle 602 and a screw 606, the distal head 601 is connected to the rear elastic tube 604 to form a cavity channel, and the distal head 601 is provided with an extension hole 6012 connected to the cavity channel; the puncture needle 602 is movably arranged in the cavity channel, and a steam channel is provided in the puncture needle 602; the screw 606 includes a connected driving section 6061 and a bending section 6062, at least part of the screw 606 is arranged in the cavity channel and arranged in parallel with the puncture needle 602, the driving section 6061 is connected to the puncture needle 602 through the connecting piece 603, the screw 606 rotates to move the connecting piece 603, thereby driving the puncture needle 602 to extend out of the extension hole 6012 or retreat into the cavity channel, and the bending section 6062 can be bent and deformed. It can be understood that the driving section 6061 is configured as a rigid structure and is not bendable, so as to facilitate the driving connecting member 603 to move in a straight line to ensure the accuracy of puncture.

[0034] According to the flexible puncture structure 6 of the embodiment of the present invention, the puncture part is sent into the corresponding position of the patient's body through the endoscope instrument channel, and then the driving part is operated to drive the puncture needle 602 to perform the puncture action. The puncture needle 602 is provided with a steam channel for releasing steam, so that the hot steam enters the lesion along the steam channel to ablate the tissue. The distal head 601 and the rear elastic tube 604 are connected to form a cavity channel together, which supports and protects the internal parts. The puncture needle 602 can extend through the extension hole 6012 on the distal head 601 for puncture. The driving section 6061 of the screw 606 is connected to the puncture needle 602 through the connecting piece 603. During operation, the screw 606 rotates under the drive of the power source, driving the connecting piece 603 to slide along the distal head 601, thereby making the puncture needle 602 relatively extend or retract from the extension hole 6012 to complete the puncture action. The rear elastic tube 604 and the curved section 6062 of the screw rod 606 are suitable for bending and deformation, have strong bending ability, and can easily reach deep into the human body, thereby achieving flexible transmission puncture.

[0035] In this embodiment, the distal head 601 is a separate component, which is cylindrical, and one end of which is open and is used to be fixedly connected to one end of the elastic tube. The end of the distal head 601 away from the rear elastic tube 604 is provided with a protrusion hole 6012 for the puncture needle 602 to protrude. The connection method between the rear elastic tube 604 and the distal head 601 can be bonding, clamping or threaded connection, which is not limited here. It should be noted that the installation space of the screw 606 is staggered with the protrusion hole 6012 to prevent the screw 606 from hindering the puncture needle 602 from protruding from the protrusion hole 6012. Exemplarily, the distal head 601 is formed with an installation space and a protrusion space in parallel, and the installation space is used to install the screw 606, the protrusion space is connected to the protrusion hole 6012, and the puncture needle 602 can move from the protrusion space to the protrusion hole 6012. It can be understood that the tip of the puncture needle 602 is used to release steam, and the tail end of the puncture needle 602 can be connected to an external steam device through a connecting pipe.

[0036] Optionally, the rear elastic tube 604 is a spring tube, which can maintain a certain strength to ensure operability, and is suitable for bending to ensure flexibility. The puncture part can enter the human body through the endoscope instrument channel to puncture the lesion tissue. The overall spring tube structure is used, and only the fixed seat is a rigid structure. The fixed seat is small in size and only about 5mm in length, so it has good flexibility and strong bending ability, and can easily pass through the endoscope channel. Of course, in other embodiments, the rear elastic tube 604 can also be made of other polymer materials, as long as it can ensure a certain flexibility.

[0037] It can be understood that the driving section 6061 of the screw 606 is provided with an external thread, and the connector 603 can be threadedly connected to the driving section 6061. When the screw 606 rotates, the connector 603 moves along the driving section 6061, thereby driving the puncture needle 602 to move and puncture. Of course, in other embodiments, the driving section 6061 can also be threadedly connected to the distal head 601, and the connection member 603 is driven to move by the movement of the screw 606. The bending section 6062 of the screw 606 can be a spring tubular structure, which can bend adaptively through various complex curved natural cavities of the human body. Due to the use of the screw 606 transmission, when the puncture needle 602 reaches the predetermined puncture site, it can be self-locking, without the need for an additional locking device.

[0038] Optionally, the puncture needle 602 is made of a polymer material with good flexibility and poor thermal conductivity, thereby avoiding scalding of normal tissues and premature condensation of steam, and achieving a good treatment effect.

[0039] According to one embodiment of the present invention, one end of the driving section 6061 away from the curved section 6062 is rotatably connected to the distal head 601, the driving section 6061 is provided with an external thread, the connecting member 603 is fixedly connected to the puncture needle 602, the connecting member 603 is threadedly connected to the driving section 6061, and when the driving section 6061 rotates, the connecting member 603 moves along the driving section 6061. It can be understood that the distal end of the screw 606 is provided with a fixed end, the fixed end is connected to the distal head 601, and the two can rotate relative to each other, and the fixed end cooperates with the distal head 601 to limit the axial displacement of the screw 606, that is, when the screw 606 rotates, the driving section 6061 rotates accordingly. Since the connecting member 603 is sleeved on the external thread of the driving section 6061 and is fixedly connected to the puncture needle 602, when the connecting member 603 moves along the driving section 6061, the puncture needle 602 moves under the drive of the connecting member 603. The screw rod 606 is rotated to make the puncture needle 602 perform puncture movement. When the screw rod 606 is rotated in the opposite direction, the puncture needle 602 can be retracted into the cavity channel to complete the puncture, which is easy to operate.

[0040] According to one embodiment of the present invention, the distal head 601 is provided with a fixing groove 6011, and one end of the driving section 6061 away from the curved section 6062 is rotatably inserted into the fixing groove 6011. It can be understood that the fixed end is rotatably connected to the fixing groove 6011, and the fixing groove 6011 plays an axial positioning role for the screw rod 606, does not limit the rotation along the central axis, and the side wall of the fixing groove 6011 can limit the fixed end to avoid position deviation when the fixed end rotates.

[0041] Please refer to Figure 1 and Figure 2 According to one embodiment of the present invention, the inner wall of the distal head 601 is provided with at least one slide groove 6013, and the extension direction of the slide groove 6013 is parallel to the extension direction of the puncture needle 602. The connecting member 603 is provided with a slider 6031 corresponding to each slide groove 6013, and the slider 6031 is accommodated in the slide groove 6013 and slides along the slide groove 6013.

[0042] It can be understood that the slider 6031 cooperates with the slide groove 6013 to limit the circumferential rotation of the connecting member 603, and does not limit the axial displacement of the connecting member 603. Exemplarily, the distal head 601 is provided with a slide groove 6013 on the circumference, the number of which is at least one, and the connecting member 603 is provided with a slider 6031 at a corresponding position, and the number of the sliders 6031 is consistent with the number of the slide grooves 6013. The connecting member 603 is slidably connected to the distal head 601 through the slide groove 6013 and the slider 6031, so that the connecting member 603 can reciprocate along the axial direction of the screw 606, and the slide groove 6013 has a guiding effect on the slider 6031 to prevent the connecting member 603 from rotating.

[0043] According to one embodiment of the present invention, the inner wall of the distal head 601 is provided with two slide grooves 6013, the two slide grooves 6013 are symmetrically arranged, and the connecting member 603 is convexly provided with two sliders 6031, and each slider 6031 is slidably arranged in a slide groove 6013. Exemplarily, the two slide grooves 6013 are respectively located above and below the connecting member 603, and accordingly, the upper and lower ends of the connecting member 603 are provided with sliders 6031, and the two sliders 6031 slide in the two slide grooves 6013 respectively, so as to ensure the stable movement of the connecting member 603 and help to keep the two ends of the connecting member 603 evenly stressed.

[0044] like Figure 3 As shown, according to one embodiment of the present invention, the distal head 601 includes a front end fixing seat 801, a front end elastic tube 803 and an intermediate fixing seat 805, and the front end fixing seat 801 is provided with an extension hole 6012; one end of the front end elastic tube 803 is connected to the end of the front end fixing seat 801 away from the extension hole 6012; the intermediate fixing seat 805 is connected to the end of the front end elastic tube 803 away from the front end fixing seat 801, and the intermediate fixing seat 805 is connected to the rear end elastic tube 604, and a telescopic space 807 is formed between the intermediate fixing seat 805 and the front end fixing seat 801, the driving section 6061 is threadedly connected to the intermediate fixing seat 805, and the connecting piece 603 is fixedly connected to the driving section 6061 and the puncture needle 602 respectively. When the driving section 6061 rotates, it is suitable for driving the connecting piece 603 to move back and forth along the telescopic space 807.

[0045] In this embodiment, the distal head 601 is composed of a plurality of parts, wherein the front end fixing seat 801, the front end elastic tube 803, the middle fixing seat 805 and the rear end elastic tube 604 are fixedly connected to each other, and together constitute the support portion of the puncture structure. The puncture needle 602 and the screw 606 are arranged side by side inside the above-mentioned support portion, the puncture needle 602 and the connecting member 603 are fixedly connected, and the screw 606 and the connecting member 603 are rotatably connected. During operation, the screw 606 is driven by the power source to rotate. Since the middle fixing seat 805 is fixed, the driving section 6061 of the screw 606 will synchronously move along the axial direction of the front end elastic tube 803 when the screw 606 rotates, thereby driving the puncture needle 602 to extend or retract from the extension hole 6012 relative to the front end fixing seat 801, and completing the puncture action. It can be understood that the intermediate fixing seat 805 can provide support for the driving section 6061 of the screw rod 606. When the screw rod 606 rotates, the driving section 6061 will extend into the telescopic space 807 and move back and forth through the threaded connection between the driving section 6061 and the intermediate fixing seat 805. The front elastic tube 803 can be adapted to bend to increase flexibility.

[0046] According to one embodiment of the present invention, the front elastic tube 803 is coated with a resin protective layer 605 .

[0047] According to one embodiment of the present invention, the rear end elastic tube 604 is coated with a resin protective layer 605. It can be understood that the resin protective layer 605 can effectively protect the front end elastic tube 803 and the rear end elastic tube 604, avoid excessive wear of the front end elastic tube 803 and the rear end elastic tube 604, thereby reducing the risk of the front end elastic tube 803 and the rear end elastic tube 604 breaking and losing elasticity.

[0048] According to one embodiment of the present invention, one end of the puncture needle 602 extending out of the extension hole 6012 is provided with a plurality of small holes 6021 connected to the steam channel. The plurality of small holes 6021 can be used to release steam, so that hot steam enters the lesion along the hole to ablate the tissue. Exemplarily, the plurality of small holes 6021 are arranged in a circumferential array along the puncture needle 602. Of course, the position, size and shape of the small holes 6021 can be designed differently according to different treatment types, and are not limited here.

[0049] like Figure 4 As shown, the steam ablation system according to the second embodiment of the present invention includes a puncture drive device 7 and the above-mentioned flexible puncture structure 6, and the puncture drive device 7 is connected to the screw rod 606 to drive the screw rod 606 to rotate.

[0050] In this embodiment, the steam ablation system also includes but is not limited to a human-machine interactive input device 1, a control system 2, a sterile water device 3, a sterile water drive component 4, and a heating unit 5. The human-machine interactive device 1 is a user operation interface. Medical staff formulate a suitable treatment plan based on the severity of the patient's symptoms, the size of the ablation volume and other specific information, and input the treatment plan into the steam ablation system through the human-machine interactive device 1. The control system 2 obtains the treatment plan from the human-machine interactive device 1 and controls the sterile water drive component 4 and the heating unit 5 by the corresponding control algorithm to control the generation process of hot steam during the treatment process. The control system 2 can also obtain a signal from the puncture drive device 7 to control the puncture drive device 7 to drive the puncture needle in the flexible puncture structure to perform a puncture action. A certain amount of sterile water is stored in the sterile water device 3. It can be in various forms such as bagged, boxed or integrated into the hospital water purification system. The sterile water drive component 4 is connected to the sterile water device 3 and the heating unit 5 through a pipeline, and the sterile water stored in the sterile water device 3 is delivered to the heating unit 5. The sterile water driving component 4 can be various pumps or other liquid driving elements with the same functions. It is preferably a peristaltic pump here, and the liquid only contacts the pipeline, which is pollution-free and safe. The other end of the heating unit 5 is connected to the flexible puncture structure through a pipeline. The heating unit 5 is used to convert the sterile water from the sterile water driving component 4 into steam, and transport it to the flexible puncture structure through the pipeline. The heating unit 5 can have a variety of heating methods, such as magnetic induction heating, microwave heating, resistance heating, infrared heating, etc. The flexible puncture structure is used to pierce the puncture needle into the lesion and transfer the hot steam from the heating unit 5 to the lesion, so as to achieve the purpose of ablating and necrosis of the lesion.

[0051] The puncture drive device 7 is used to drive the puncture needle 602 in the flexible puncture structure 6 to extend or retract the distal end, and can be in manual mode, automatic mode, or manual + automatic mode. If it is in manual mode, it does not need to communicate with the control system 2; if it is in automatic mode, it communicates with the control system 2, and the control system 2 controls the puncture drive device 7. At this time, the drive device 7 can be a motor or other similar power device.

[0052] The steam ablation system according to the embodiment of the present invention includes the above-mentioned flexible puncture structure 6, and thus has all the technical effects of the above-mentioned flexible puncture structure, which will not be described in detail here.

[0053] The following describes the operation process of the steam ablation system: First, preoperative preparation is performed to ensure that the steam ablation system can work normally. The distal end of the endoscope is sent through the patient's mouth through the gastrointestinal tract into the duodenum. After the distal ultrasound probe of the endoscope is used to detect the location, size, shape and other information of the lesion, the flexible puncture structure 6 is sent into the patient's body through the endoscope instrument channel. With the assistance of the endoscope, the puncture needle 602 is aimed at the lesion. The puncture needle 602 can be manually or automatically controlled to extend the distal head 601 and pierce the designated position in the lesion. After puncture, the steam ablation system is controlled to generate steam according to the corresponding program and send the steam into the lesion through the small hole 6021 at the end of the puncture needle 602. At this time, the puncture needle 602 can be controlled to retract into the distal head 601 by operating the endoscope and the puncture drive device 7 and pierce into another position of the lesion again for ablation. The puncture ablation operation can be repeated according to the severity of the lesion. The puncture is ended by operating the puncture drive device 7 to control the puncture needle 602 to retract into the distal head 601. Finally, the flexible puncture structure 6 is taken out from the endoscope instrument channel, and the endoscope is taken out from the patient's body.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A flexible puncture structure, characterized in that: include: Rear elastic tube; A distal head, the distal head is connected with the rear elastic tube to form a cavity channel, and the distal head is provided with a protruding hole communicating with the cavity channel; A puncture needle, the puncture needle is movably disposed in the cavity channel, and a steam channel is provided in the puncture needle; A screw rod, the screw rod comprising a connected driving section and a bending section, at least a portion of the screw rod is disposed in the cavity channel and arranged in parallel with the puncture needle, the driving section is connected to the puncture needle through a connecting piece, the screw rod is rotated to move the connecting piece, thereby driving the puncture needle to extend out of the extension hole or retract into the cavity channel, and the bending section can be bent and deformed.

2. The flexible puncture structure according to claim 1, characterized in that: One end of the driving section away from the bending section is rotatably connected to the distal head, the driving section is provided with an external thread, the connecting piece is fixedly connected to the puncture needle, the connecting piece is threadedly connected to the driving section, and when the driving section rotates, the connecting piece moves along the driving section.

3. The flexible puncture structure according to claim 2, characterized in that: The distal end head is provided with a fixing groove, and one end of the driving section away from the bending section is rotatably inserted into the fixing groove.

4. The flexible puncture structure according to claim 1, characterized in that: The inner wall of the distal head is provided with at least one slide groove, the extension direction of the slide groove is parallel to the extension direction of the puncture needle, and the connecting piece is provided with a slider corresponding to each slide groove, and the slider is accommodated in the slide groove and slides along the slide groove.

5. The flexible puncture structure according to claim 4, characterized in that: The inner wall of the distal end head is provided with two slide grooves, which are symmetrically arranged. The connecting piece is protrudingly provided with two sliders, and each slider is slidably arranged in one slide groove.

6. The flexible puncture structure according to claim 1, characterized in that: The distal tip comprises: A front end fixing seat, wherein the front end fixing seat is provided with the extension hole; A front elastic tube, one end of which is connected to an end of the front fixing seat away from the extension hole; An intermediate fixing seat, wherein the intermediate fixing seat is connected to one end of the front end elastic tube away from the front end fixing seat, the intermediate fixing seat is connected to the rear end elastic tube, a telescopic space is formed between the intermediate fixing seat and the front end fixing seat, the driving section is threadedly connected to the intermediate fixing seat, the connecting piece is respectively fixedly connected to the driving section and the puncture needle, and when the driving section rotates, it is suitable for driving the connecting piece to move back and forth along the telescopic space.

7. The flexible puncture structure according to claim 6, characterized in that: The front end elastic tube is coated with a resin protective layer.

8. The flexible puncture structure according to any one of claims 1 to 7, characterized in that: The rear end elastic tube is coated with a resin protective layer.

9. The flexible puncture structure according to any one of claims 1 to 7, characterized in that: One end of the puncture needle extending out of the extension hole is provided with a plurality of small holes communicating with the steam channel.

10. A steam ablation system, characterized in that: It comprises a puncture drive device and the flexible puncture structure according to any one of claims 1 to 9, wherein the puncture drive device is connected to the screw rod to drive the screw rod to rotate.

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