Steam ablation puncture mechanism for endoscopic instrument channel

Abstract

The present application relates to the technical field of vapor ablation, and provides a vapor ablation puncture mechanism for an endoscope instrument channel, which 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 jointly encloses an active cavity, the fixed seat is provided with an extension hole communicating with the active cavity, the puncture needle is movably arranged in the active cavity, the puncture needle is provided with a vapor channel, the rotating shaft is arranged in the active cavity and connected to the fixed seat, the traction wire passes through the rotating shaft, and the puncture needle is fixedly connected to the traction wire; the driving part is connected to two ends of the traction wire led out by the rotating shaft, the driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend out of the extension hole or retreat into the active cavity. The traction wire drives the puncture needle to move, and flexible transmission puncture is realized. The structure is small in size, high in flexibility, and has great puncture force, so that the structure can easily pass through a thin endoscope channel and penetrate into a human lesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vapor ablation, in particular to a vapor ablation puncture mechanism for endoscopic instrument channel. BACKGROUND

[0002] The thermal vapor ablation is a minimally invasive, safe and efficient thermal ablation treatment method developed rapidly in recent years. In this method, sterile water is heated into high-temperature steam, and then the steam is injected into the lesion tissue through a special needle. The high-temperature steam makes the lesion tissue lose activity, and then the lesion tissue is apoptotic and necrotic and is absorbed by the human body, so as to achieve the corresponding treatment effect.

[0003] The thermal vapor ablation has been successfully applied to the treatment of prostatic hyperplasia. In this operation, the puncture structure is combined with the rigid lens, and the puncture is performed under the guidance of the rigid lens, and the steam is delivered to the prostatic hyperplasia area for thermal ablation.

[0004] In the related art, the thermal vapor ablation equipment for the treatment of prostatic hyperplasia and the like has a rigid structure for needle structure, which cannot be bent and does not have flexibility, and cannot be applied to the treatment through various complex curved natural cavities of the human body. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the related art. To this end, the present application provides a vapor ablation puncture mechanism for endoscopic instrument channel, which aims to realize flexible transmission puncture.

[0006] The vapor ablation puncture mechanism for endoscopic instrument channel according to the embodiment of the present application comprises:

[0007] A puncture part, the puncture part comprises a fixed seat, an elastic tube, a puncture needle, a rotating shaft, a traction wire, the fixed seat is connected to one end of the elastic tube, and the fixed seat and the elastic tube jointly enclose a movable cavity, the fixed seat is provided with an extension hole communicating with the movable cavity, the puncture needle is 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 with the fixed seat, the traction wire passes around the rotating shaft, and the puncture needle is fixedly connected with the traction wire;

[0008] A driving part, the driving part is connected to both ends of the traction wire led out by the rotating shaft, the driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend out of the extension hole or retreat into the movable cavity.

[0009] The steam ablation puncture mechanism for endoscopic instrument channel according to the embodiment of the present application can send the puncture part into the corresponding position in the patient's body through the endoscopic instrument channel, and then operate the driving part 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 and the elastic tube of the puncture part are connected to form a cavity structure, which supports and protects the internal parts. The puncture needle can be extended through the extension hole of the fixed seat to perform the puncture. Meanwhile, the fixed seat is provided with a rotating shaft, and the traction wire passes around the rotating shaft. The two ends of the traction wire are pulled by the driving part, so that the traction wire moves back and forth around the rotating shaft. The puncture needle can be extended or retracted into the movable cavity along the movement of the traction wire. In this way, the elastic tube can facilitate the bending of the puncture part to improve the flexibility. In addition, the traction wire drives the puncture needle to move, so that the flexible transmission puncture is realized. The structure has small size, high flexibility and large puncture force, and can easily pass through the thin endoscopic channel and penetrate into the lesion in the human body.

[0010] According to one embodiment of the present application, the puncture needle and the traction wire are fixedly connected through a connecting piece.

[0011] According to one embodiment of the present application, 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.

[0012] According to one embodiment of the present application, a resin protective layer is attached to the outside of the elastic tube.

[0013] According to one embodiment of the present application, the steam ablation puncture mechanism further comprises a tensioning part, which comprises:

[0014] Two fixed parts, one end of the traction wire is connected with the driving part through one of the fixed parts, and the other end is connected with the driving part through the other fixed part;

[0015] A distal end guide part is arranged between the fixed part and the elastic tube, and the distal end guide part is provided with two distal end guide holes. One end of the traction wire passes through one of the distal end guide holes, and the other end passes through the other distal end guide hole.

[0016] According to one embodiment of the present application, the tensioning part comprises a proximal end guide part arranged between the distal end guide part and the fixed part. The proximal end guide part is provided with two proximal end guide holes. One end of the traction wire passes through one of the proximal end guide holes, and the other end passes through the other proximal end guide hole. The distance between the two proximal end guide holes is greater than the distance between the two distal end guide holes.

[0017] According to one embodiment of the present application, each of the fixed parts comprises:

[0018] a distal fixing member, one end of the distal fixing member being connected with the traction wire;

[0019] a proximal fixing member, one end of the proximal fixing member being threadedly connected with the other end of the distal fixing member, the proximal fixing member being connected with the driving part, the threadedly fitted depth being adjustable;

[0020] a locking nut, the locking nut being adapted to be threadedly fitted with one of the proximal fixing member and the distal fixing member, and abutting with the other one of the proximal fixing member and the distal fixing member, so as to lock the proximal fixing member and the distal fixing member.

[0021] According to one embodiment of the present application, the tensioning part comprises a locking member, the locking member being sleeved on the traction wire and connected with the distal fixing member.

[0022] According to one embodiment of the present application, the driving part comprises:

[0023] a mounting base, the mounting base being provided with a shaft hole;

[0024] a locking shaft, one end of the locking shaft being threaded through the shaft hole and being rotatably connected with the mounting base through a bearing;

[0025] a knob, the knob being rotatably sleeved on the rotating shaft;

[0026] a driving wheel, the driving wheel being fixedly connected with the knob, the driving wheel being adapted to rotate with the knob relative to the locking shaft;

[0027] a driving bar, the driving bar being bypassed by the driving wheel, one end of the driving bar being connected with one of the fixing members, the other end of the driving bar being connected with the other one of the fixing members.

[0028] According to one embodiment of the present application, the driving wheel is a sprocket, and the driving bar is a chain.

[0029] According to one embodiment of the present application, a friction assembly is sleeved on the locking shaft, the friction assembly being located on one side of the driving wheel, the friction assembly being adapted to approach or move away from the driving wheel when the locking shaft rotates, the friction assembly being used for abutting and locking the driving wheel.

[0030] According to one embodiment of the present application, the friction assembly comprises a friction ring and a friction sheet, the friction ring being fixedly sleeved on the locking shaft, the friction sheet being provided on one side of the friction ring facing the driving wheel, the friction ring being adapted to drive the friction sheet to abut or move away from the driving wheel when the locking shaft rotates.

[0031] According to one embodiment of the present application, the friction assembly further comprises a guide shaft connected to the mounting base, the guide shaft is parallel to the locking shaft in axial direction, and the guide shaft passes through the friction ring for guiding axial movement of the friction ring.

[0032] According to one embodiment of the present application, one end of the locking shaft is provided with a screw handle.

[0033] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0035] Figure 1 is a structural schematic view of a steam ablation puncture mechanism for endoscope instrument channel provided by the embodiment of the present application.

[0036] Figure 2 is a sectional view of a puncture part provided by the embodiment of the present application.

[0037] Figure 3 is a partial structural sectional view of the puncture part provided by the embodiment of the present application.

[0038] Figure 4 is a structural schematic view of a tensioning part provided by the embodiment of the present application.

[0039] Figure 5 is a sectional structural schematic view of a driving part provided by the embodiment of the present application.

[0040] Reference signs:

[0041] 10, puncture part; 101, fixed seat; 102, elastic tube; 103, resin protective layer; 104, puncture needle; 1041, small hole; 105, traction wire; 106, rotating shaft; 107, connecting piece;

[0042] 20, tensioning part; 201, proximal end fixing piece; 202, locking nut; 203, distal end fixing piece; 204, locking piece; 205, proximal end guide piece; 206, distal end guide piece;

[0043] 30, drive part; 301, knob; 3011, boss feature; 302, left seat body; 303, locking ring; 304, sprocket; 305, chain; 306, friction plate; 307, friction ring; 308, right seat body; 309, bearing; 310, locking shaft; 311, guide shaft. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be further described in details with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0045] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be 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 "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0049] Please refer to Figures 1 to 3 The steam ablation puncture mechanism for endoscopic instrument channel according to the embodiments of the present application 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 jointly encloses an active cavity. The fixed seat is provided with an extension hole communicating with the active cavity. The puncture needle is movably arranged in the active cavity and is provided with a steam channel. The rotating shaft is arranged in the active cavity and is 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 is connected to the two ends of the traction wire led out by the rotating shaft. The driving part drives the traction wire to move around the rotating shaft to drive the puncture needle to extend out of the extension hole or retreat into the active cavity.

[0050] The steam ablation puncture mechanism for endoscopic instrument channel according to the embodiments of the present application 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 a 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 and the elastic tube of the puncture part are connected to jointly form a cavity structure to support and protect the internal parts. The puncture needle can extend out of the extension hole on the fixed seat to perform puncture. At the same time, the rotating shaft is arranged in the fixed seat. The traction wire passes around the rotating shaft. The two ends of the traction wire pulled by the driving part can make the traction wire move back and forth around the rotating shaft. The puncture needle can extend out or retreat into the active cavity following the movement of the traction wire. In this way, the elastic tube can facilitate the bending of the puncture part to improve flexibility. In addition, the traction wire drives the puncture needle to move to realize flexible transmission puncture. The structure has small size, strong flexibility and large puncture force, and can easily pass through the thin endoscope channel and penetrate into the human lesion.

[0051] It can be understood that the fixed seat is in a cylindrical shape, one end of which is open and used for fixed connection with one end of the elastic tube, and the other end of the fixed seat away from the elastic tube is provided with an extension hole for the puncture needle to extend out of. The connection mode of the elastic tube and the fixed seat can be adhesion, clamping or threaded connection, which is not limited herein. It should be noted that the installation space of the rotating shaft is staggered with the extension hole to avoid the rotating shaft from hindering the puncture needle from extending out of the extension hole. Exemplarily, the fixed seat is divided into an installation space and an extension space, the installation space is used for installing the rotating shaft, the extension space is communicated with the extension hole, and the puncture needle can move from the extension space to the extension hole. It can be understood that the tip of the puncture needle is used for releasing steam, and the tail end of the puncture needle can be connected to an external steam device through the connecting pipe.

[0052] Optionally, the elastic tube is a spring tube, which can maintain a certain strength to ensure operability and be suitable for bending to ensure flexibility, and the puncture part can enter the human body through the endoscope instrument channel to puncture the lesion tissue. The overall structure adopts a spring tube structure, and only the fixed seat is a rigid structure. The fixed seat is small in size and only about 5 mm in length, and therefore is good in flexibility and strong in bending capacity, and can easily pass through the endoscope channel. Of course, in other embodiments, the elastic tube can also be made of other high polymer materials, as long as a certain flexibility can be ensured.

[0053] 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 to puncture. The ultra-fine steel wire is used to drive the puncture needle to puncture, and flexible transmission puncture can be realized. It can be understood that the traction wire extends out of the rotating shaft in two approximately parallel sections. In this way, the traction wire is divided into two sections connected to each other with the rotating shaft as a dividing point. The two sections of the traction wire extend outward to be connected to the driving part respectively. It should be noted that the puncture needle is connected to one of the two sections of the traction wire. When the driving part pulls one section, the section moves away from the extension hole, and the other section moves towards the extension hole. In this way, with the direction shown in the figure 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.

[0054] As shown in Figure 2 According to one embodiment of the present application, the puncture needle and the traction wire are fixedly connected through a connecting piece. It can be understood that the connecting piece is connected to the puncture needle and the traction wire respectively. For example, two through holes are provided on the connecting piece, and the puncture needle and the traction wire are arranged in the two through holes respectively, so that the puncture needle can move with the traction wire. Of course, in other embodiments, the connecting piece can also be connected to the puncture needle and the traction wire in other ways such as adhesion and interference fit, which is not limited herein. The fixed position of the connecting piece on the puncture needle can be adjusted according to the required puncture depth. When the fixed position is away from the fixed seat, the puncture depth is deeper. When the fixed position is close to the fixed seat, the puncture depth is shallower.

[0055] According to one embodiment of the present invention, a plurality of small holes connected to a steam channel are provided at one end of the puncture needle extending from the extension hole. These holes can be used to release steam, allowing the hot steam to enter the lesion through the holes and ablate the tissue. For example, the holes are arranged in an array along the circumference of the puncture needle. Of course, the position, size, and shape of the holes can be designed differently depending on the type of treatment and are not limited here.

[0056] 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.

[0057] 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 fixing parts 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.

[0058] It is understood that the tensioning portion can realize the connection and guidance of the traction wire, so that the traction wire is connected to the driving portion through the tensioning portion, and the driving portion 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 traction wire sections drawn from the rotating shaft are parallel to each other to avoid interference between the two traction wire sections. At the same time, the driving portion 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 traction wire sections are connected to different driving ends of the driving portion 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 traction wire sections located between the rotating shaft and the distal guide can be parallel to each other to avoid interference. Of course, under the influence of installation error or production error, the two traction wire sections are not absolutely parallel. It is only necessary to ensure that the two traction wire sections do not interfere with each other when moving.

[0059] 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.

[0060] It can be understood that the proximal guide can further improve the movement 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 distance therebetween is greater than the distance between the two distal guide holes, so that the two sections of the traction wire located between the distal guide and the fixing member are arranged at an 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 move away from each other to facilitate the connection of the driving ends at different positions of the driving part. That is, the traction wire enters the distal guide and the proximal guide in sequence after passing through the elastic tube, 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 an angle.

[0061] According to one embodiment of the present application, 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 with the traction wire; one end of the proximal fixing member is threadedly connected with the other end of the distal fixing member, the proximal fixing member is connected with the driving part, and the depth of the thread cooperation is adjustable; the locking nut is adapted to threadedly cooperate with one of the proximal fixing member and the distal fixing member, and abut with the other one of the proximal fixing member and the distal fixing member to lock the proximal fixing member and the distal fixing member.

[0062] In this embodiment, the distal fixture and the proximal fixture are interconnected to complete the drive connection between the driving unit and the traction wire, and the tension of the traction wire can be adjusted by adjusting the thread engagement depth of the distal fixture and the proximal fixture. Exemplarily, one end of the distal fixture is connected to the traction wire and the other end is provided with an external thread, while one end of the proximal fixture is connected to the driving unit and the other end is provided with a threaded hole. The distal fixture and the proximal fixture are connected via the external thread and the threaded hole, and the thread engagement depth is adjustable. Specifically, the depth of the threaded hole is relatively deep, so that the depth to which the distal fixture can be inserted into the threaded hole via the external thread is adjustable. In this way, when the distal fixture is inserted into the threaded hole of the proximal fixture to a relatively deep depth, the distal fixture tightens the traction wire. Conversely, when the distal fixture is inserted into the threaded hole of the proximal fixture to a relatively shallow depth, the distal fixture is relatively relaxed with respect to the traction wire, so that the traction wire is not overly tight. In addition, the locking nut can be threadedly engaged with the distal fixing member, and the locking nut is sleeved on the external thread of the distal fixing member. When the locking nut is screwed to the end face of the proximal fixing member, the distal fixing member and the proximal fixing member are locked with each other. That is to say, after the thread engagement of the distal fixing member is adjusted to a suitable distance, the locking nut is tightened and in close contact with the proximal fixing member, and is locked under the action of friction to prevent subsequent thread loosening. The tensioning force of the traction wire can be adjusted by adjusting the depth of the thread engagement, 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 member can also be provided with an external thread, and the distal fixing member can be provided with a threaded hole. At this time, the locking nut is suitable for thread engagement with the proximal fixing member and is locked in contact with the distal fixing member.

[0063] According to one embodiment of the present invention, the tensioning portion includes a locking member that is sleeved over the traction wire and connected to the distal fixture. In this embodiment, a U-shaped hole (not shown) is provided on the distal fixture near the traction wire. One end of the traction wire passes through the U-shaped hole, then exits and connects to the locking member. The locking member moves toward the distal fixture to tighten the traction wire. In this manner, the locking member locks the traction wire, thereby securing the traction wire and the distal fixture, making installation easier.

[0064] like Figure 5 As 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 bar, 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 bar bypasses the driving wheel, and one end of the driving bar is connected to a fixing member, and the other end is connected to another fixing member.

[0065] In the embodiment, the mounting seat comprises a left seat body and a right seat body, the left seat body and the right seat body are arranged at intervals, and the left seat body and the right seat body are both provided with an axle hole, the locking shaft passes through the two axle holes, that is, the left seat body and the right seat body jointly support the locking shaft to keep the locking shaft stably rotating. Specifically, the right seat body is provided with a bearing, the locking shaft passes through the left seat body to reach the bearing in the right seat body and is matched with the bearing, 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 that the left and right here are described based on the direction of the drawing.

[0066] 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, thus, the driving strip can be driven to move by the driving wheel through rotating the knob, since the two ends of the driving strip are connected to the two fixed members respectively, that is, the two ends of the driving strip are drivingly connected to the two ends of the traction wire, the traction wire and the driving strip are connected to form a closed loop, the driving strip moves and the traction wire moves correspondingly. For example, the knob is sleeved outside the locking shaft and embedded in the cavity of the left seat body, the driving part comprises a locking ring, the locking ring is sleeved on the knob and located at the right side of the left seat body, the axial position of the left seat body is limited by the locking ring and the boss feature of the knob itself, so that the knob can only rotate around the left seat body and the locking shaft. Alternatively, the driving strip can be a steel wire, a chain or other long strip structure suitable for bending, which is not limited here.

[0067] According to one embodiment of the application, the driving wheel is a chain wheel and the driving strip is a chain. It can be understood that the chain wheel is sleeved on the right end of the knob and fixedly connected with the knob. The chain is matched with the chain wheel, and the two ends of the chain are fixedly connected with the two fixed members described above. The chain wheel is adopted to drive the chain and the traction wire to move, which is simple and reliable in structure, does not slip, and is stable in transmission. When the knob rotates, the chain wheel can be driven to rotate, and then the chain is driven to rotate around the chain wheel, so that the traction wire is driven to rotate around the rotating shaft, and finally the puncture needle is driven to perform the extension or retraction action to perform the puncture or complete the puncture.

[0068] According to one embodiment of the application, 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 adapted to approach or move away from the driving wheel when the locking shaft rotates, and the friction assembly is used to abut against the locking driving wheel.

[0069] In the embodiment, the locking shaft and the knob are independent of each other, and rotation of the two does not affect each other. It can be understood that the friction assembly rotates with the locking shaft, and when the locking shaft is rotated, the friction assembly can be close to or away from the driving wheel. The friction assembly abuts against the driving wheel to limit the rotation of the driving wheel. That is, when the locking shaft is rotated to make the friction assembly abut against the driving wheel, the driving wheel and the knob cannot be rotated any more. The knob is locked by the screw pressing mode, and the structure is simple. The locking and loosening operation is convenient, and self-locking can be realized, so that the puncture needle is kept from moving, the knob is prevented from being accidentally touched, and the operation safety is ensured.

[0070] According to one embodiment of the application, the friction assembly comprises a friction ring and a friction sheet. The friction ring is fixedly sleeved on the locking shaft, and the friction sheet is arranged on one side of the friction ring facing the driving wheel. The friction ring is adapted to drive the friction sheet to abut against or move away from the driving wheel when the locking shaft is rotated.

[0071] It can be understood that the friction ring is used to abut against one side of the friction sheet away from the driving wheel to provide a supporting force when the friction sheet abuts against the locking driving wheel. For example, the friction ring is located at a position close to the right end of the locking shaft and is connected with the locking shaft through threads. The friction sheet is sleeved outside the locking shaft and is located between the sprocket and the friction ring.

[0072] According to one embodiment of the application, 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 penetrates the friction ring to guide the axial movement of the friction ring.

[0073] The guide shaft is fixedly connected to the right seat body, and the number is at least 1. A corresponding cavity is arranged on the friction ring for penetrating the guide shaft. The guide shaft is used to guide the axial movement of the friction ring. When the locking shaft is rotated, the friction ring will move axially and cannot be rotated under the action of the guide shaft and the threads of the locking shaft.

[0074] For example, in the direction shown in the figure, when the friction ring moves to the left, it will push the friction sheet to move to the left synchronously. Since the sprocket (driving wheel) is fixed in the axial position and does not move, the friction sheet will abut against the sprocket after moving to a certain position. The abutting friction force between the friction sheet and the sprocket will gradually increase as the friction ring continues to move to the left, so that the sprocket is finally kept circumferentially fixed, thereby keeping the puncture needle in a fixed position. When the locking shaft is rotated in the opposite direction, the friction ring moves to the right, and the friction sheet and the sprocket will automatically separate, and the friction force between them is zero. At this time, the sprocket is in a relaxed state and can be freely rotated.

[0075] According to one embodiment of the present application, one end of the locking shaft is provided with a screw handle. It can be understood that the screw handle is gripped to facilitate rotation of the locking shaft, thereby achieving locking and loosening of the driving wheel, which is convenient for operation. Since the knob is not fixedly connected with 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, the locking mechanism such as the locking shaft and the friction assembly will not move when puncturing, and the puncture mechanism such as the driving wheel and the puncture needle will not move when locking, so that the puncture and locking actions are independent of each other and do not interfere with each other.

[0076] During operation, the operator first inserts the endoscope into the patient's body, then sends the puncture part of the mechanism into the corresponding position through the endoscope instrument channel, then rotates the knob to drive the puncture needle to perform a puncture action, rotates the locking shaft to lock the sprocket after reaching the target puncture position, so that the position of the puncture needle remains stationary for treatment. After the treatment is completed, the locking shaft is rotated in the opposite direction to loosen the sprocket, the knob is rotated in the opposite direction, the puncture needle is retracted, the puncture part is removed from the endoscope instrument channel, then the endoscope is removed from the patient's body, and the treatment is completed.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the present application, and are not limiting to the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the present application, and should be covered in the scope of the claims of the present application.

Claims

1. A vapor ablation puncture mechanism for use through an endoscopic instrument channel, characterized by, The application relates to a steam ablation puncture mechanism. The 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 jointly encloses a movable cavity. The fixed seat is provided with an extension hole communicating with the movable cavity. The puncture needle is movably arranged in the movable cavity. The puncture needle is internally 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. The puncture needle is fixedly connected to the traction wire. The driving part is connected to two ends of the traction wire passing around the rotating shaft. The driving part drives the traction wire to move around the rotating shaft, so as to drive the puncture needle to extend out of the extension hole or retreat into the movable cavity. The steam ablation puncture mechanism further comprises a tensioning part.

2. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, The tensioning part comprises two fixed parts.

3. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, One end of the traction wire is connected to the driving part through one fixed part.

4. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, The other end of the traction wire is connected to the driving part through the other fixed part.

5. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, A distal end guide is arranged between the fixed parts and the elastic tube. The distal end guide is provided with two distal end guide holes. One end of the traction wire passes through one distal end guide hole. The other end of the traction wire passes through the other distal end guide hole.

6. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 5, wherein, The tensioning part comprises a proximal end guide.

7. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, The proximal end guide is arranged between the distal end guide and the fixed part. The proximal end guide is provided with two proximal end guide holes. One end of the traction wire passes through one proximal end guide hole. The other end of the traction wire passes through the other proximal end guide hole. The interval of the two proximal end guide holes is greater than the interval of the two distal end guide holes. The driving part comprises a mounting seat, a locking shaft, a knob, a driving wheel and a driving strip. The mounting seat is provided with a shaft hole. One end of the locking shaft passes through the shaft hole and is rotatably connected to the mounting seat through a bearing. The knob is rotatably arranged on the rotating shaft. The driving wheel is fixedly connected to the knob and is adapted to rotate relative to the locking shaft along with the knob. The driving strip passes around the driving wheel. One end of the driving strip is connected to one fixed part. The other end of the driving strip is connected to the other fixed part. The puncture needle and the traction wire are fixedly connected through a connecting part. The end of the puncture needle extending out of the extension hole is provided with a plurality of small holes communicating with the steam channel. The elastic tube is externally attached with a resin protective layer. Each fixed part comprises a distal end fixed part and a proximal end fixed part. One end of the distal end fixed part is connected to the traction wire. One end of the proximal end fixed part is threadedly connected to the other end of the distal end fixed part. The proximal end fixed part is connected to the driving part. The threadedly matched depth of the proximal end fixed part is adjustable. A locking nut is adapted to be threadedly matched with one of the proximal end fixed part and the distal end fixed part and abutted with the other one to lock the distal end fixed part and the proximal end fixed part. The tensioning part comprises a locking part. The locking part is arranged on the traction wire and connected to the distal end fixed part. The driving wheel is a chain wheel. The driving strip is a chain.

8. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, The locking shaft is sleeved with a friction assembly, the friction assembly is located at one side of the driving wheel, the friction assembly is adapted to move close to or away from the driving wheel when the locking shaft rotates, and the friction assembly is used for abutting against and locking the driving wheel.

9. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 8, wherein, The friction assembly comprises a friction ring and a friction sheet, the friction ring is fixedly sleeved on the locking shaft, the friction sheet is arranged on one side of the friction ring facing the driving wheel, and the friction ring is adapted to drive the friction sheet to abut against or move away from the driving wheel when the locking shaft rotates.

10. The steam ablation puncture mechanism for use in an endoscopic instrument channel of claim 9, wherein, 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, the guide shaft penetrates through the friction ring, and the guide shaft is used for guiding the axial movement of the friction ring.

11. The steam ablation puncture mechanism for use in a transendoscopic instrument channel of claim 1, wherein, One end of the locking shaft is provided with a screw handle.

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