Vapor ablation puncture mechanism for transendoscopic instrument channel

Abstract

The invention relates to the technical field of steam ablation, and provides a steam ablation puncture mechanism used for passing through an endoscope instrument channel, the steam ablation puncture mechanism comprises a puncture part and a driving part, the puncture part comprises a fixed seat, an elastic tube, a puncture needle, a rotating shaft and a traction wire, the fixed seat is connected to one end of the elastic tube, and a movable cavity is defined by the fixed seat and the elastic tube; the fixing seat is provided with an extending hole communicated with the movable cavity, the puncture needle is movably arranged in the movable cavity, a steam channel is arranged in the puncture needle, the rotating shaft is arranged in the movable cavity and connected with the fixing seat, the traction wire bypasses the rotating shaft, and the puncture needle is fixedly connected with the traction wire. The driving part is connected with the two ends led out by the traction wire bypassing the rotating shaft and drives the traction wire to move around the rotating shaft so as to drive the puncture needle to extend out of the extending hole or return to the movable cavity. The puncture needle is driven to move through the traction wire, and flexible transmission puncture is achieved. The structure is small in size, high in flexibility and large in puncture force, and can easily penetrate through a thin endoscope channel and penetrate into the focus of a human body.

Description

Technical Field

[0001] The invention relates to the technical field of steam ablation, and in particular to a steam ablation puncture mechanism used for passing through an endoscopic instrument channel. Background Art

[0002] Thermal steam ablation is a minimally invasive, safe and efficient thermal ablation treatment method that has developed rapidly in recent years. This method heats sterile water into high-temperature steam, and then injects the steam into the diseased tissue through a special needle. The high-temperature steam is used to inactivate the diseased tissue, which then undergoes apoptosis and necrosis and is absorbed by the human body, thereby achieving the corresponding therapeutic effect.

[0003] Thermal steam ablation has been successfully used to treat prostate hyperplasia. In this procedure, the puncture structure is combined with a hard endoscope, and the puncture is performed under the guidance of the hard endoscope and steam is delivered to the prostate hyperplasia area for thermal ablation.

[0004] In the related art, the hot steam ablation equipment used for treating prostate hyperplasia and the like has a rigid needle structure that cannot be bent and is not flexible, and is not suitable for treating natural cavities of various complex curved shapes in the human body. Summary of the invention

[0005] 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 steam ablation puncture mechanism for use through an endoscopic instrument channel, aiming to achieve flexible transmission puncture.

[0006] The steam ablation puncture mechanism for passing through an endoscopic instrument channel according to an embodiment of the present invention comprises: The puncture part includes a fixed seat, an elastic tube, a puncture needle, a rotating shaft, and a traction wire. The fixed seat is connected to one end of the elastic tube and together form a movable cavity. The fixed seat is provided with a protrusion hole connected to the movable cavity. The puncture needle can be movably arranged in the movable cavity. The puncture needle is provided with a steam channel. The rotating shaft is arranged in the movable cavity and connected to the fixed seat. The traction wire passes around the rotating shaft, and the puncture needle is fixedly connected to the traction wire. A driving part is connected to the two ends of the traction wire that are led out around the rotating shaft, and the driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend from the extension hole or retract into the active cavity.

[0007] According to the steam ablation puncture mechanism for passing through the endoscopic instrument channel of the embodiment of the present invention, the puncture part is sent into the corresponding position in the patient's body through the endoscopic instrument channel, and then the driving part is operated to drive the puncture needle to perform the puncture action. The puncture needle 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 fixed seat of the puncture part is connected with the elastic tube to form a cavity structure together, which supports and protects the internal parts. The puncture needle can extend through the extension hole on the fixed seat for puncture. At the same time, a rotating shaft is provided in the fixed seat, and the traction wire bypasses the rotating shaft. The driving part pulls the two ends of the traction wire to make the traction wire move back and forth around the rotating shaft, and the puncture needle can extend or retract into the active cavity following the movement of the traction wire. In this way, the elastic tube can facilitate the puncture part to bend and improve flexibility. In addition, the puncture needle is driven to move by the traction wire to achieve flexible transmission puncture. The structure is small in size, has strong flexibility and has a large puncture force, and can easily pass through a thin endoscopic channel and puncture into a human lesion.

[0008] According to one embodiment of the present invention, the puncture needle and the traction wire are fixedly connected via a connecting piece.

[0009] 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.

[0010] According to an embodiment of the present invention, a resin protective layer is attached to the elastic tube.

[0011] According to one embodiment of the present invention, the steam ablation puncture mechanism further includes a tensioning portion, and the tensioning portion includes: Two fixings, one end of the traction wire is connected to the driving part through one of the fixings, and the other end is connected to the driving part through the other fixing; A distal guide member is provided between the fixing member and the elastic tube, and the distal guide member is provided with two distal guide holes, one end of the traction wire passes through one of the distal guide holes, and the other end passes through the other distal guide hole.

[0012] According to one embodiment of the present invention, the tensioning part includes a proximal guide member, which is arranged between the distal guide member and the fixing member, and the proximal guide member is provided with two proximal guide holes, one end of the traction wire passes through one of the proximal guide holes, and the other end passes through the other proximal guide hole, and the distance between the two proximal guide holes is greater than the distance between the two distal guide holes.

[0013] According to one embodiment of the present invention, each of the fixing members comprises: A distal fixing piece, one end of which is connected to the traction wire; A proximal fixing member, one end of which is threadedly connected to the other end of the distal fixing member, the proximal fixing member is connected to the driving part, and the thread engagement depth is adjustable; A locking nut, wherein the locking nut is adapted to be threadedly matched with one of the proximal fixing member and the distal fixing member, and to abut against the other of the proximal fixing member to lock the distal fixing member and the proximal fixing member.

[0014] According to an embodiment of the present invention, the tensioning portion includes a locking piece, and the locking piece is sleeved on the traction wire and connected to the distal fixing piece.

[0015] According to one embodiment of the present invention, the driving unit comprises: A mounting seat, wherein the mounting seat is provided with an axial hole; A locking shaft, one end of which is passed through the shaft hole and is rotatably connected to the mounting seat via a bearing; A knob, the knob being rotatably sleeved on the rotating shaft; A driving wheel, the driving wheel is fixedly connected to the knob, and the driving wheel is adapted to follow the knob and rotate relative to the locking shaft; A driving bar is provided, wherein the driving bar goes around the driving wheel, and one end of the driving bar is connected to one of the fixing members, and the other end of the driving bar is connected to the other fixing member.

[0016] According to an embodiment of the present invention, the driving wheel is a sprocket, and the driving bar is a chain.

[0017] According to one embodiment of the present invention, a friction component is sleeved on the locking shaft, the friction component is located on one side of the driving wheel, the friction component is suitable for approaching or moving away from the driving wheel when the locking shaft rotates, and the friction component is used to abut and lock the driving wheel.

[0018] According to one embodiment of the present invention, the friction assembly includes a friction ring and a friction plate, the friction ring is fixedly sleeved on the locking shaft, the friction plate is arranged on the side of the friction ring facing the driving wheel, and the friction ring is suitable for driving the friction plate to abut against the driving wheel or move away from the driving wheel when the locking shaft rotates.

[0019] According to one embodiment of the present invention, the friction assembly further comprises a guide shaft, the guide shaft is connected to the mounting seat, the axial direction of the guide shaft is parallel to the axial direction of the locking shaft, and the guide shaft passes through the friction ring for guiding the axial movement of the friction ring.

[0020] According to an embodiment of the present invention, a screwing handle is provided at one end of the locking shaft.

[0021] 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

[0022] 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.

[0023] Figure 1 It is a structural schematic diagram of a steam ablation puncture mechanism for passing through an endoscopic instrument channel provided in an embodiment of the present invention.

[0024] Figure 2 It is a cross-sectional view of the puncture portion provided by an embodiment of the present invention.

[0025] Figure 3 It is a partial structural cross-sectional view of the puncture portion provided by an embodiment of the present invention.

[0026] Figure 4 It is a schematic structural diagram of a tensioning portion provided in an embodiment of the present invention.

[0027] Figure 5 It is a schematic cross-sectional structure diagram of a driving unit provided in an embodiment of the present invention.

[0028] Reference numerals: 10. puncture part; 101. fixing seat; 102. elastic tube; 103. resin protective layer; 104. puncture needle; 1041. small hole; 105. traction wire; 106. rotating shaft; 107. connecting piece; 20, tensioning part; 201, proximal fixing member; 202, locking nut; 203, distal fixing member; 204, locking member; 205, proximal guide member; 206, distal guide member; 30. Driving unit; 301. Knob; 3011. Boss feature; 302. Left seat; 303. Locking ring; 304. Sprocket; 305. Chain; 306. Friction plate; 307. Friction ring; 308. Right seat; 309. Bearing; 310. Locking shaft; 311. Guide shaft. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Please refer to Figures 1 to 3According to an embodiment of the present invention, a steam ablation puncture mechanism for passing through an endoscopic instrument channel includes a puncture part and a driving part. The puncture part includes a fixed seat, an elastic tube, a puncture needle, a rotating shaft, and a traction wire. The fixed seat is connected to one end of the elastic tube and together form an active cavity. The fixed seat is provided with an extension hole connected to the active cavity. The puncture needle can be movably arranged in the active cavity. A steam channel is provided in the puncture needle. The rotating shaft is arranged in the active cavity and connected to the fixed seat. The traction wire passes around the rotating shaft, and the puncture needle is fixedly connected to the traction wire; the driving part connects the two ends of the traction wire that pass around the rotating shaft, and the driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend from the extension hole or retract into the active cavity.

[0035] According to the steam ablation puncture mechanism for passing through the endoscopic instrument channel of the embodiment of the present invention, the puncture part is sent into the corresponding position in the patient's body through the endoscopic instrument channel, and then the driving part is operated to drive the puncture needle to perform the puncture action. The puncture needle 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 fixed seat of the puncture part is connected with the elastic tube to form a cavity structure together, which supports and protects the internal parts. The puncture needle can extend through the extension hole on the fixed seat for puncture. At the same time, a rotating shaft is provided in the fixed seat, and the traction wire bypasses the rotating shaft. The driving part pulls the two ends of the traction wire to make the traction wire move back and forth around the rotating shaft, and the puncture needle can extend or retract into the active cavity following the movement of the traction wire. In this way, the elastic tube can facilitate the puncture part to bend and improve flexibility. In addition, the puncture needle is driven to move by the traction wire to achieve flexible transmission puncture. The structure is small in size, has strong flexibility and has a large puncture force, and can easily pass through a thin endoscopic channel and puncture into a human lesion.

[0036] It is understandable that the fixing seat is cylindrical, one end of which is open and is used to be fixedly connected to one end of the elastic tube. The end of the fixing seat away from the elastic tube is provided with an extension hole for the puncture needle to extend out. The connection method between the elastic tube and the fixing seat can be bonding, clamping or threaded connection, which is not limited here. It should be noted that the installation space of the rotating shaft is staggered with the extension hole to prevent the rotating shaft from hindering the puncture needle from extending out of the extension hole. Exemplarily, the fixing seat is separated into an installation space and an extension space, and the installation space is used to install the rotating shaft. The extension space is connected to the extension hole, and the puncture needle can move from the extension space to the extension hole. It is understandable that the tip of the puncture needle is used to release steam, and the tail end of the puncture needle can be connected to an external steam device through a connecting tube.

[0037] Optionally, the elastic tube 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. Therefore, it has good flexibility and strong bending ability, and can easily pass through the endoscope channel. Of course, in other embodiments, the elastic tube can also be made of other polymer materials, as long as it can ensure a certain flexibility.

[0038] Optionally, the traction wire is a steel wire, which can ensure a certain strength and is not easy to break when the puncture needle is pulled for puncture. The puncture needle is driven by ultra-fine steel wire for puncture, and flexible transmission puncture can be achieved. It can be understood that the traction wire bypasses the rotating shaft and leads to two roughly parallel sections. In this way, the traction wire is divided into two connected sections with the rotating shaft as the dividing point, and the two sections of traction wire extend outward to be respectively connected to the driving part. It should be noted that the puncture needle is connected to one section of the traction wire. When the driving part pulls one section, the section moves in the direction away from the extension hole, and the other section moves in the direction of the extension hole. In this way, based on the illustrated direction as a reference, when the traction wire rotates clockwise around the rotating shaft, the puncture needle moves to the right, that is, extends out of the fixed seat through the extension hole to start puncture; when the traction wire rotates counterclockwise around the rotating shaft, the puncture needle moves to the left, that is, retracts into the fixed seat.

[0039] like Figure 2 As shown, according to one embodiment of the present invention, the puncture needle and the traction wire are fixedly connected by a connector. It can be understood that the connector connects the puncture needle and the traction wire respectively. For example, two insertion holes are provided on the connector, and the puncture needle and the traction wire are respectively inserted into the two insertion holes, so that the puncture needle can move with the traction wire. Of course, in other embodiments, the connector can fix the puncture needle and the traction wire respectively by bonding, interference fit, etc., which are not limited here. The fixed position of the connector on the puncture needle can be adjusted accordingly according to the required puncture depth. When the fixed position is far away from the fixing seat, the puncture depth can be deeper; when the fixed position is close to the fixing seat, the puncture depth can be shallower.

[0040] According to one 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 connected to the steam channel, and the plurality of small holes can be used to release steam, so that the hot steam enters the lesion along the hole to ablate the tissue. Exemplarily, the plurality of small holes are arranged in an array along the circumference of the puncture needle. Of course, the position, size and shape of the small holes can be designed differently according to different treatment types, and are not limited here.

[0041] According to one embodiment of the present invention, a resin protective layer is attached to the outside of the elastic tube. It can be understood that the resin protective layer can effectively protect the elastic tube and prevent the elastic tube from being excessively worn, thereby reducing the risk of the elastic tube breaking and losing elasticity.

[0042] like Figure 4 As shown, according to one embodiment of the present invention, the steam ablation puncture mechanism also includes a tensioning part, the tensioning part includes two fixings and a distal guide part, one end of the traction wire is connected to the driving part through a fixing part, and the other end is connected to the driving part through another fixing part; the distal guide part is arranged between the fixing part and the elastic tube, and the distal guide part has two distal guide holes, one end of the traction wire passes through one distal guide hole, and the other end passes through the other distal guide hole.

[0043] It is understandable that the tensioning part can realize the connection guide of the traction wire, so that the traction wire is connected to the driving part through the tensioning part, and the driving part drives the traction wire to move around the rotating shaft. Under the action of the distal guide, the path of the traction wire can be limited, so that the two sections of traction wire drawn from the rotating shaft are parallel to each other to avoid the two sections of traction wire from interfering with each other. At the same time, the driving part is connected by a fixing member, and the traction wire between the fixing member and the distal guide can be arranged at a certain angle, so that the two sections of traction wire are connected to different driving ends of the driving part away from each other. Optionally, the distal guide is block-shaped, and the two distal guide holes are spaced apart, and the spacing between the two can be equal to the diameter of the rotating shaft. In this way, the two sections of traction wire between the rotating shaft and the distal guide can be parallel to each other to avoid interfering with each other. Of course, under the influence of installation error or production error, the two sections of traction wire are not absolutely parallel, and it is only necessary to ensure that the two sections of traction wire do not interfere with each other when moving.

[0044] According to one embodiment of the present invention, the tensioning part includes a proximal guide member, which is arranged between the distal guide member and the fixing member. The proximal guide member is provided with two proximal guide holes. One end of the traction wire passes through one proximal guide hole, and the other end passes through the other proximal guide hole. The distance between the two proximal guide holes is greater than the distance between the two distal guide holes.

[0045] It is understandable that the proximal guide can further improve the moving stability of the traction wire to avoid shaking during the movement of the traction wire. The two proximal guide holes are spaced apart, and the spacing between them is greater than the spacing between the two distal guide holes, so that the two sections of the traction wire between the distal guide and the fixing member are at a certain angle to separate from each other, and the angle is determined by the driving part, so that the two ends of the traction wire can be separated from each other to facilitate the connection of the driving ends at different positions on the driving part. In other words, after passing through the elastic tube, the traction wire enters the distal guide and the proximal guide successively, and the path of the traction wire is limited under the action of the two guides, wherein the distal guide makes the two sections of the traction wire parallel to each other, and the proximal guide makes the two sections of the traction wire arranged at a certain angle.

[0046] According to one embodiment of the present invention, each fixing member includes a distal fixing member, a proximal fixing member and a locking nut, one end of the distal fixing member is connected to the traction wire; one end of the proximal fixing member is threadedly connected to the other end of the distal fixing member, the proximal fixing member is connected to the driving part, and the thread matching depth is adjustable; the locking nut is suitable for threading with one of the proximal fixing member and the distal fixing member, and abutting with the other of the two to lock the distal fixing member and the proximal fixing member.

[0047] In this embodiment, the driving connection between the driving part and the traction wire is completed by connecting the distal fixing member and the proximal fixing member to each other, and the tension of the traction wire is adjusted by adjusting the thread matching depth of the distal fixing member and the proximal fixing member. Exemplarily, one end of the distal fixing member is connected to the traction wire, and the other end is provided with an external thread, while one end of the proximal fixing member is connected to the driving part, and the other end is provided with a threaded hole. The distal fixing member and the proximal fixing member are connected through the above-mentioned external thread and threaded hole, and the thread matching depth is adjustable. Specifically, the depth of the threaded hole is deep, so that the depth of the distal fixing member inserted into the threaded hole of the proximal fixing member through the external thread is adjustable, so that when the depth of the distal fixing member inserted into the threaded hole of the proximal fixing member is deep, the distal fixing member tightens the traction wire. On the contrary, when the depth of the distal fixing member inserted into the threaded hole of the proximal fixing member is shallow, the distal fixing member is relatively relaxed for the traction wire, so that the traction wire will not be too tight. In addition, the locking nut can be threadedly matched with the distal fixing, and the locking nut is sleeved on the external thread of the distal fixing. When the locking nut is screwed to the end face of the proximal fixing, the distal fixing and the proximal fixing are locked with each other. That is to say, after the threaded match of the distal fixing is adjusted to a suitable distance, the locking nut is tightened and tightly contacted with the proximal fixing, and locked under the action of friction to prevent subsequent thread loosening. The tension of the traction wire can be adjusted by adjusting the depth of the thread match, that is, the influence of the incoming length of the traction wire and the assembly error can be compensated, so that the driving force of the driving part is accurately transmitted to the puncture part. In other embodiments, the proximal fixing can also be provided with an external thread, and the distal fixing can be provided with a threaded hole. At this time, the locking nut is suitable for threaded match with the proximal fixing, and abuts and locks with the distal fixing.

[0048] According to one embodiment of the present invention, the tensioning part includes a locking member, which is sleeved on the traction wire and connected to the distal fixing member. In this embodiment, a U-shaped hole (not shown) is provided on the side of the distal fixing member close to the traction wire. After one end of the traction wire passes through the U-shaped hole, it is led out and connected to the locking member. The locking member moves toward the distal fixing member to tighten the traction wire. In this way, the traction wire is locked under the action of the locking member, so that the traction wire is locked and connected to the distal fixing member, which is convenient for installation.

[0049] like Figure 5As shown, according to one embodiment of the present invention, the driving part includes a mounting seat, a locking shaft, a knob, a driving wheel and a driving strip, the mounting seat is provided with an axial hole; one end of the locking shaft is passed through the axial hole and is rotatably connected to the mounting seat through a bearing; the knob is rotatably sleeved on the rotating shaft; the driving wheel is fixedly connected to the knob, and the driving wheel is suitable for following the knob to rotate relative to the locking shaft; the driving strip bypasses the driving wheel, and one end of the driving strip is connected to a fixing member, and the other end is connected to another fixing member.

[0050] In this embodiment, the mounting seat includes a left seat body and a right seat body, the left seat body and the right seat body are arranged at intervals, and both the left seat body and the right seat body are provided with an axial hole, and the locking shaft passes through the two axial holes, that is, the left seat body and the right seat body jointly support the locking shaft to keep the locking shaft stable in rotation. Specifically, a bearing is provided on the right seat body, and the locking shaft passes through the left seat body to reach the right seat body and cooperates with the bearing in the right seat body. The bearing limits the axial position of the locking shaft, but does not limit the circumferential rotation, that is, the locking shaft can rotate relative to the right fixed seat, but cannot move axially. It should be noted here that the left and right here are only described based on the direction of the illustration.

[0051] It can be understood that the knob and the driving wheel are fixedly connected, and both rotate on the locking shaft. When the knob is rotated, the driving wheel also rotates. In this way, by grabbing the knob and rotating it, the driving bar can be driven to move accordingly through the driving wheel. Since the two ends of the driving bar are respectively connected to two fixings, that is, the two ends of the driving bar are respectively driven to connect to the two ends of the traction wire, the traction wire and the driving bar are connected to form a closed loop, and the traction wire moves accordingly when the driving bar moves. Exemplarily, the knob is sleeved on the outside of the locking shaft and embedded in the cavity of the left seat body. The driving part includes a locking ring, which is sleeved on the knob and located on the right side of the left seat body. Under the action of the locking ring and the boss features of the knob itself, the axial position of the left seat body is limited, so that the knob can only rotate around the left seat body and the locking shaft. Optionally, the driving bar can be a steel wire, a chain or other long strip structure suitable for bending, which is not limited here.

[0052] According to one embodiment of the present invention, the driving wheel is a sprocket, and the driving bar is a chain. It is understandable that the sprocket is sleeved on the right end of the knob and is fixedly connected to the knob. The chain cooperates with the sprocket, and the two ends of the chain are respectively fixedly connected to the two fixings mentioned above. The sprocket is used to drive the chain and the traction wire to move, and the structure is simple and reliable, does not slip, and the transmission is stable. When the knob is rotated, the sprocket can be driven to rotate, and then the chain can be rotated around the sprocket, thereby driving the traction wire to rotate around the rotating shaft, and finally the puncture needle is extended or retracted to perform or complete the puncture.

[0053] According to one embodiment of the present invention, a friction assembly is sleeved on the locking shaft, the friction assembly is located on one side of the driving wheel, the friction assembly is suitable for approaching or moving away from the driving wheel when the locking shaft rotates, and the friction assembly is used to abut and lock the driving wheel.

[0054] In this embodiment, the locking shaft and the knob are independent of each other, and the rotation of the two will not affect each other. It can be understood that the friction component rotates with the locking shaft. When the locking shaft is rotated, the friction component can be close to or away from the driving wheel, and the friction component abuts the driving wheel to limit the rotation of the driving wheel. That is, when the locking shaft is rotated to make the friction component abut the driving wheel, the driving wheel and the knob can no longer rotate. The knob is locked by a spiral compression method, which has a simple structure, convenient locking and loosening operations, and can achieve self-locking, thereby keeping the puncture needle from moving, preventing accidental touching of the knob, and ensuring operational safety.

[0055] According to one embodiment of the present invention, the friction assembly includes a friction ring and a friction plate. The friction ring is fixedly sleeved on the locking shaft, and the friction plate is arranged on the side of the friction ring facing the driving wheel. The friction ring is suitable for driving the friction plate to abut the driving wheel or move away from the driving wheel when the locking shaft rotates.

[0056] It can be understood that the friction ring is used to abut the side of the friction plate facing away from the drive wheel to provide support force when the friction plate abuts against the locked drive wheel. Exemplarily, the friction ring is located near the right end of the locking shaft and is connected to the locking shaft through a threaded connection. The friction plate is sleeved on the outside of the locking shaft and is located between the sprocket and the friction ring.

[0057] According to one embodiment of the present invention, the friction assembly further comprises a guide shaft connected to the mounting seat, the axial direction of the guide shaft is parallel to the axial direction of the locking shaft, and the guide shaft passes through the friction ring for guiding the axial movement of the friction ring.

[0058] The guide shaft is fixedly connected to the right seat body, and the number is at least one. A corresponding cavity is provided on the friction ring for passing the guide shaft, and the guide shaft is used to guide the axial movement of the friction ring. When the locking shaft rotates, under the action of the guide shaft and the locking shaft thread, the friction ring will move axially and cannot rotate.

[0059] Taking the direction shown in the figure as an example, when the friction ring moves to the left, it will push the friction plate to move to the left synchronously. Since the sprocket (driving wheel) is fixed in the axial position, the friction plate will abut against the sprocket after moving to a certain position. The friction ring continues to move to the left, and the abutting friction between the friction plate and the sprocket will gradually increase, eventually keeping the sprocket circumferentially fixed, so that the puncture needle remains in a fixed position. When the locking shaft rotates in the opposite direction and the friction ring moves to the right, the friction plate and the sprocket will automatically separate, and the friction between them is zero. At this time, the sprocket is in a relaxed state and can rotate freely.

[0060] According to one embodiment of the present invention, a screwing handle is provided at one end of the locking shaft. It is understandable that by grabbing the screwing handle, the locking shaft can be rotated to achieve locking and loosening of the driving wheel, which is easy to operate. Since the knob is not fixedly connected to the locking shaft, the locking shaft can remain stationary when the knob is rotated, and the knob can also remain stationary when the locking shaft is rotated. Therefore, when puncturing, the locking mechanism such as the locking shaft and the friction component will not be driven to move, and similarly, when locking, the puncture mechanism such as the driving wheel and the puncture needle will not be driven to move. The puncture and locking actions are independent of each other and do not interfere with each other.

[0061] During operation, the operator first inserts the endoscope into the patient's body, then sends the puncture part of the mechanism to the corresponding position through the endoscope instrument channel, then rotates the knob to drive the puncture needle to perform the puncture action, and after reaching the target puncture position, rotates the locking shaft to lock the sprocket to keep the puncture needle in place for treatment. After the treatment is completed, rotate the locking shaft in the opposite direction, loosen the sprocket, rotate the knob in the opposite direction, retract the puncture needle, remove the puncture part from the endoscope instrument channel, and then remove the endoscope from the patient's body, and the treatment is completed.

[0062] 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 steam ablation puncture mechanism for use through an endoscopic instrument channel, characterized in that: include: The puncture part includes a fixed seat, an elastic tube, a puncture needle, a rotating shaft, and a traction wire. The fixed seat is connected to one end of the elastic tube and together form a movable cavity. The fixed seat is provided with a protrusion hole connected to the movable cavity. The puncture needle can be movably arranged in the movable cavity. The puncture needle is provided with a steam channel. The rotating shaft is arranged in the movable cavity and connected to the fixed seat. The traction wire passes around the rotating shaft, and the puncture needle is fixedly connected to the traction wire. A driving part is connected to the two ends of the traction wire that are led out around the rotating shaft, and the driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend from the extension hole or retract into the active cavity.

2. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 1, characterized in that: The puncture needle and the traction wire are fixedly connected via a connecting piece.

3. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 1, 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.

4. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 1, characterized in that: The elastic tube is provided with a resin protective layer.

5. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to any one of claims 1 to 4, characterized in that: The steam ablation puncture mechanism further includes a tensioning portion, and the tensioning portion includes: Two fixings, one end of the traction wire is connected to the driving part through one of the fixings, and the other end is connected to the driving part through the other fixing; A distal guide member is provided between the fixing member and the elastic tube, and the distal guide member is provided with two distal guide holes, one end of the traction wire passes through one of the distal guide holes, and the other end passes through the other distal guide hole.

6. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 5, characterized in that: The tensioning part includes a proximal guide member, which is arranged between the distal guide member and the fixing member. The proximal guide member is provided with two proximal guide holes. One end of the traction wire passes through one proximal guide hole, and the other end passes through the other proximal guide hole. The distance between the two proximal guide holes is greater than the distance between the two distal guide holes.

7. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 5, characterized in that: Each of the fixing members comprises: A distal fixing piece, one end of which is connected to the traction wire; A proximal fixing member, one end of which is threadedly connected to the other end of the distal fixing member, the proximal fixing member is connected to the driving part, and the thread engagement depth is adjustable; A locking nut, wherein the locking nut is adapted to be threadedly matched with one of the proximal fixing member and the distal fixing member, and to abut against the other of the proximal fixing member to lock the distal fixing member and the proximal fixing member.

8. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 7, characterized in that: The tensioning portion comprises a locking piece, which is sleeved on the traction wire and connected to the distal fixing piece.

9. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 5, characterized in that: The driving unit comprises: A mounting seat, wherein the mounting seat is provided with an axial hole; A locking shaft, one end of which is passed through the shaft hole and is rotatably connected to the mounting seat via a bearing; A knob, the knob being rotatably sleeved on the rotating shaft; A driving wheel, the driving wheel is fixedly connected to the knob, and the driving wheel is adapted to follow the knob and rotate relative to the locking shaft; A driving bar is provided, wherein the driving bar goes around the driving wheel, and one end of the driving bar is connected to one of the fixing members, and the other end of the driving bar is connected to the other fixing member.

10. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 9, characterized in that: The driving wheel is a sprocket, and the driving bar is a chain.

11. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 9, characterized in that: A friction component is sleeved on the locking shaft and is located at one side of the driving wheel. The friction component is suitable for approaching or moving away from the driving wheel when the locking shaft rotates, and the friction component is used to abut and lock the driving wheel.

12. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 11, characterized in that: The friction assembly includes a friction ring and a friction plate. The friction ring is fixedly sleeved on the locking shaft. The friction plate is arranged on a side of the friction ring facing the driving wheel. The friction ring is suitable for driving the friction plate to abut against the driving wheel or move away from the driving wheel when the locking shaft rotates.

13. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 12, characterized in that: The friction assembly also includes a guide shaft, which is connected to the mounting seat. The axial direction of the guide shaft is parallel to the axial direction of the locking shaft. The guide shaft passes through the friction ring and is used to guide the axial movement of the friction ring.

14. The steam ablation puncture mechanism for use through an endoscopic instrument channel according to claim 9, characterized in that: One end of the locking shaft is provided with a screwing handle.

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