WO2023236055A1

WO2023236055A1 - Auxiliary traction forceps for endoscopic surgery

Info

Publication number: WO2023236055A1
Application number: PCT/CN2022/097439
Authority: WO
Inventors: 严航; 来永得; 孔凡斌; 王斌; 刘向飞; 邱筱赛
Original assignee: 上海诺英医疗器械有限公司
Priority date: 2022-06-07
Filing date: 2022-06-07
Publication date: 2023-12-14

Abstract

Disclosed are auxiliary traction forceps for endoscopic surgery. The auxiliary traction forceps comprise, sequentially connected: a forceps head, a sheath and a handle; the sheath is provided with a bendable section, and a steering wire and a traction wire are accommodated and fixed in the bendable section; one end of the steering wire is connected to a sheath bending control mechanism of the handle, the sheath bending control mechanism being suitable for achieving, via bidirectional traction of the steering wire, the bidirectional bending of the bendable section of the sheath and the locking and maintaining of the bending angle; one end of the traction wire is connected to a forceps head opening and closing control mechanism of the handle, the other end of the traction wire is connected to the forceps head, and the forceps head opening and closing control mechanism is suitable for achieving, via bidirectional traction of the traction wire, the opening, closing and locking of the forceps head so as to maintain an open or closed state. The present invention can achieve determination of a traction position, locking of a traction angle and maintaining of a current position, with an operator not needing to manually control the entire process, thus enhancing operational comfort and precision.

Description

Endoscopic surgery-assisted traction forceps

Technical field

The invention relates to the technical field of medical devices, and in particular to an auxiliary traction forceps for endoscopic surgery, which is used to assist in pulling mucosal tissue under endoscopic surgery.

Background technique

The stripping of diseased submucosal tissue is the core part of the endoscopic submucosal dissection (ESD) operation process, and the exposure of the surgical field between the mucosa and submucosal tissue is the key to safe and smooth operation. In order to make ESD surgery go more smoothly, people have invented some methods to assist ESD operations, namely assisted traction technology. Its fundamental purpose is to improve the field of view and increase the visibility of the submucosal layer, so as to accurately identify the cutting line, improve surgical efficiency, reduce surgical time and complications, and enable diseased tissue in some difficult locations to be successfully removed through ESD.

The existing auxiliary traction methods of diseased mucosa for ESD include percutaneous puncture traction method, gravity suspension method, tissue clip-assisted traction method, rubber band traction method, elastic medical ring method and S-O clip traction method. These methods have low device requirements, and some traction devices can be made by clinicians according to intraoperative needs. However, the disadvantage is that the flexibility in controlling the pulling direction and pulling force is poor, and some methods have the risk of the device being retained in the human body. Therefore, a surgical instrument with controllable pulling direction and accurate grasp of the lesion mucosa is needed.

Chinese patent document CN214017647U discloses a mucosal traction device and an endoscopic system. The mucosal traction device includes a tube body, a first clip and a traction component. The first clip is installed at the distal end of the tube body, and the traction component is provided with a first action part. and a second action part. The first action part acts on the distal end of the tube body, and the second action part is used to act on the distal end of the endoscope. When the traction member is pulled, the distal end of the tube body is in contact with the endoscope. The distal ends of the scope are close to each other and remain fixed. When the traction member is released, the distal end of the tube body and the distal end of the endoscope can move independently. The endoscopic system includes the aforementioned mucosal traction device.

Chinese patent document CN102125459B discloses a mucosal retractor, which includes: an endoscope fixing part that can be installed on the distal head of the endoscope; an instrument lifting part that can install surgical instruments; a swing arm, one end of the swing arm is connected to the endoscope The mirror fixed part is movably connected, and the other end of the swing arm is movably connected with the instrument lifting part; a traction part, the distal end of the traction part is connected with the instrument lifting part.

Chinese patent document CN212438762U discloses an ESD surgical traction instrument, which includes a guide handle, an upper cover, a guide ball, an outer sleeve, a guide tube and a pulling clamp; the outer sleeve, the guide tube and the pulling clamp are sequentially connected along the axial direction, The guide ball is fixedly connected to the outer sleeve, and the upper cover is placed around the outer periphery of the guide ball and is configured to rotate along the spherical surface of the guide ball; a push-pull cable is connected to the guide handle. The push-pull cable passes through the upper cover, guide ball, outer sleeve and guide tube in sequence in the axial direction and is connected to the pulling clamp, and the guide handle can reciprocate along the axial direction of the push-pull cable; A plurality of traction wires are connected to the upper cover, and each traction wire passes over the guide ball along the outer periphery of the guide ball and is connected to the end of the guide tube.

Of the above three, CN214017647U cannot independently control the traction angle and only relies on the deflection of the tip of the endoscope to locate the lesion; CN102125459B relies on external force to deflect the lifting sleeve to achieve directional control, and it is also unable to accurately control the traction angle; CN212438762U although the clamp head is bent, opened and closed It is integrated on a handle, but it cannot keep the clamp head open and closed and locked in the bent state alone. That is, during the process of locating the lesion and implementing traction, the traction angle/position cannot be fixed, and the operator needs to manually control the whole process, which is laborious. The bending position of existing devices mostly adopts a snake bone structure. When bending, due to the pulling of the internal traction wire, it is easy to cause the snake bone to deform in the original bending state, interfering with the operator's operation.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing technology, improve the follow-up performance of tissue forceps relative to the endoscope, and increase the locking function of the tissue forceps operating state, so as to achieve accurate positioning to the lesion and rapid and efficient endoscopic examination. Operation.

In order to achieve the above object, the present invention provides an auxiliary traction forceps for endoscopic surgery, which includes a forceps head, a sheath and a handle connected in sequence; the sheath has a bendable section, and a steering wire is accommodated and fixed in the bendable section. and a pulling wire; one end of the steering wire is connected to a sheath bending control mechanism of the handle, and the sheath bending mechanism is adapted to realize bidirectional bending of the bendable section of the sheath by pulling the steering wire in two directions. Locking maintains the bending angle; one end of the traction wire is connected to the clamp head opening and closing control mechanism of the handle, and the other end is connected to the clamp head, and the clamp head opening and closing control mechanism is suitable for pulling the traction in both directions. The wire realizes the opening and closing of the pliers head and locks it to maintain the open and closed state.

Further, the flexible section of the sheath tube is a multi-layer composite structure, which is a sheath tube, an outer snake bone, a steering wire, a snake bone take-over and an inner snake bone in order from the outside to the inside; the traction wire accommodates and passes through the inner snake bone. Within the bone; both the outer snake bone and the inner snake bone are suitable for bidirectional bending.

Furthermore, the outer snake bone is suitable for bending at 270° in both directions.

Furthermore, the inner snake bone is suitable for bending 180° in both directions.

Further, the outer snake bone, the inner snake bone and the snake bone take over are fixedly connected at their axial proximal ends; the inner snake bone remains freely movable at one end close to the pliers head.

Further, the steering wire is axially arranged on both sides of the sheath, and is suitable for causing the sheath to move in different directions by pulling one of the steering wires in a direction approaching the pliers head or in a direction away from the pliers head. Side bend.

Further, the sheath bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably located in the middle of the lower cover of the handle, and the roller is fixedly located at the rear of the lower cover; The steering wire is fixed by the curved push button assembly and extends to the roller, and is wrapped tightly around the roller and then turned back.

Further, the curved push button assembly includes a second push button seat, the second push button seat is provided with a steering wire fixing interface, and the steering wire is fixed to the steering wire fixing interface; the second push button The seat is slidably located on the inner bottom surface of the lower cover. A second spring is accommodated in the second push button seat. A second blocking block is provided on the top surface of the second spring. The second blocking block has a built-in head. The second screw faces upward, and a second push button is screwed on the second screw.

Further, the steering wire at least includes an upper steering wire and a lower steering wire, and the upper steering wire and the lower steering wire are separated or continuous.

Further, when the upper steering wire and the lower steering wire are continuous, a first scaling structure of the steering wire is provided on the second push button seat, and the first scaling structure of the steering wire is suitable for At the same time, the effective lengths of the upper steering wire and the lower steering wire are adjusted.

Further, the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod. The adjustment channel is a cavity and extends along the length direction of the lower cover. The adjustment rod is perpendicular to the extension direction of the adjustment channel from It penetrates one side wall of the cavity from the outside inward and can be mounted on the other side wall of the cavity in a bidirectional rotation. A through hole is opened radially in the middle section of the adjustment rod; the adjustment channel is used as a guide for the steering wire. Traveling and effective length scaling channel, the steering wire directly wraps around the adjusting rod for a certain number of turns or passes through the through hole and then wraps around the adjusting rod for a certain number of turns.

Further, the steering wire includes an upper steering wire, an adjustment steering wire and a lower steering wire in sequence, and the three are continuous; the second push button seat is provided with a second zooming structure of the steering wire, and the steering wire is The second wire scaling structure is adapted to bidirectionally adjust the effective lengths of the upper side steering wire and the lower side steering wire by bidirectionally scaling the length of the adjustment steering wire.

Further, the second scaling structure of the steering wire includes an adjustment channel, a left adjuster and a right adjuster. The adjustment channel is a cavity and extends along the length direction of the lower cover. The left adjuster and right adjuster Perpendicular to the extension direction of the adjustment channel, it penetrates one side of the cavity wall from outside to inside and is rotatably mounted on the other side wall of the cavity. The average diameter of the middle sections of the left regulator and the right regulator is A through hole is opened in the direction; the adjustment channel is used as a passage and effective length scaling channel for the steering wire, and the steering wire directly wraps around the left adjuster and the right adjuster for a certain number of turns or passes through each of the channels. After the holes are made, wind the left adjuster and the right adjuster respectively for a certain number of turns.

Further, the handle includes an upper cover, and a plurality of slots are provided on the inner top surface of the upper cover; the second block has at least one second protrusion, and the second protrusion is suitable for being embedded in the handle. The slot is used to fix the position of the second push button seat.

Further, the upper cover is provided with a chute, and the second push button extends out of the upper cover through the chute and is adapted to move back and forth along the chute.

Further, a guide groove is provided on the upper cover, and the guide groove is suitable for receiving and guiding the steering wire.

Further, a guide sleeve is provided in the guide groove.

Further, the mouth of the receiving cavity of the second push button seat has a second limiting portion extending inward.

Further, the clamp head opening and closing control mechanism includes a clamping push button assembly located at the front of the lower cover of the handle, the clamping push button assembly includes a first push button seat, and the first push button The seat is provided with a traction wire fixing interface, and the traction wire is fixed to the traction wire fixation interface; the first push button seat is slidably located on the inner bottom surface of the lower cover, and the first push button seat accommodates a third push button seat. A spring, a first clamping block is provided on the top surface of the first spring, a first screw with an upward head is built in the first clamping block, and a first push button is screwed on the first screw.

Further, the first block has at least one first protrusion, and the first protrusion is adapted to be inserted into a plurality of slots on the upper cover of the handle to fix the position of the first push button seat. .

Further, the mouth of the accommodation cavity of the first push button seat has a first limiting portion extending inward.

Further, the handle includes a stress diffusion tube, and the stress diffusion tube is docked with the sheath.

Compared with the prior art, the beneficial effects of the present invention are:

1. It can achieve precise control of the traction angle, including bidirectional 180° bending of the clamp head and 360° twisting of the tube body, basically covering the angle required for operation.

2. It can determine the traction position, lock the traction angle, and maintain the current position. The operator does not need to control the whole process by hand, which improves the comfort and accuracy of operation.

3. Add a support structure at the bending position to cover the traction wire that controls the opening and closing of the clamp head and bend along with the bending section to provide support, prevent deformation of the bending section, and reduce operating interference.

Description of the drawings

Figure 1 is a schematic structural diagram of an embodiment of the present invention;

Figure 2 is a schematic structural diagram (section) of the sheath in one embodiment of the present invention;

Figure 3 is a schematic structural diagram of the lower cover (including the sheath bending mechanism and the clamp head opening and closing control mechanism) in one embodiment of the present invention;

Figure 4 is a schematic structural diagram of the clamping push button assembly of the clamp head opening and closing control mechanism in one embodiment of the present invention;

Figure 5 is a schematic structural diagram of the bending push button assembly of the sheath bending mechanism in one embodiment of the present invention;

Figure 6 is a schematic structural diagram of the upper cover in one embodiment of the present invention;

Figure 7 is a schematic diagram of the first scaling structure of the steering yarn in one embodiment of the present invention;

Figure 8 is a schematic diagram of the second scaling structure of the steering yarn in one embodiment of the present invention.

In the picture:

1-plier head; 2-sheath; 21-tube; 22-outer snake bone; 221-turning wire; 221a-upper turning wire; 221b-lower turning wire; 221c-adjusting section turning wire; 23-inner snake Bone; 24-snake bone takeover; 25-outer sheath tube; 26-inner tube; 27-traction wire; 3-handle; 31-upper cover; 311-card slot; 312-guide groove; 313-chute; 32- Lower cover; 33-clamping push button assembly; 331-first push button; 332-first push button seat; 3321-first limiting part; 333-first clamping block; 3331-first protrusion; 334- The first spring; 335-the first screw; 34-bent push button assembly; 341-the second push button; 342-the second push button seat; 3421-the second limiting part; 343-the second clamping block; 3431-the Two protrusions; 344-second spring; 345-second screw; 346-adjusting rod; 347-left adjuster; 348-right adjuster; 35-roller; 36-stress diffusion tube.

Detailed ways

The following describes the embodiments of the present invention through specific examples in conjunction with the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the directional words mentioned in this article, such as up, down, left, right, front, middle, back, bottom, top, inside, outside, etc., all refer to the directions shown in the figure. This is for convenience of description and is not intended to limit the invention in any way.

As shown in Figures 1 to 6, one embodiment of the auxiliary traction forceps for endoscopic surgery of the present invention includes a forceps head 1, a sheath 2 and a handle 3 connected in sequence; the sheath 2 has a bendable section, and the A steering wire 221 and a pulling wire 27 are accommodated and fixed in the bendable section; one end of the steering wire 221 is connected to the sheath bending control mechanism of the handle 3, and the sheath bending mechanism is adapted to pull the steering wire in two directions. The wire 221 realizes bidirectional bending of the bendable section of the sheath 2 and locks the bending angle; one end of the pulling wire 27 is connected to the clamp head opening and closing control mechanism of the handle 3, and the other end is connected to the clamp head 1 , the plier head opening and closing control mechanism is adapted to realize the opening and locking of the plier head 1 by pulling the pulling wire 27 in two directions to maintain the open and closed state.

In this embodiment, the positions of the flexible part of the endoscope and the flexible section of the sheath 2 of the traction forceps overlap and are bound together. As long as the flexible part of the endoscope performs a bending action, the sheath 2 The bendable section of 2 must be bent along with it, and has good followability, which can effectively reduce the operating radius. The handle 3 of the traction forceps is provided with a sheath bending control mechanism to control the bending angle and bending direction of the bendable section of the sheath 2. It can be bent in a certain direction as needed and adjusted to a suitable bending angle. After the adjustment is in place, it can be locked. To maintain the bending angle, it is no longer necessary to manually hold a certain part to maintain the bending angle, which saves time and effort, is convenient and fast; similarly, a clamp head opening and closing control mechanism is provided in the handle 3 of the traction pliers to control the opening and closing of the clamp head 1 Open or close, and can lock the open or closed state, that is, if it is in the closed state, it will remain closed, if it is in the open state, the opening size will remain unchanged, and no manual maintenance is required. A bidirectional bending angle mark can be set on the side of the sheath bending control mechanism of the handle 3 to make the control of the bending angle clearer.

In one embodiment, the flexible section of the sheath tube 2 is a multi-layer composite structure, which is the sheath tube 21, the outer snake bone 22, the steering wire 221, the snake bone connecting tube 24 and the inner snake bone 23 in order from the outside to the inside; The traction wire 27 is accommodated and passed through the inner snake bone 23; both the outer snake bone 22 and the inner snake bone 23 are suitable for bidirectional bending. In this embodiment, the snake bone connecting tube 24 connects the inner snake bone 23 and the outer snake bone 22 at the proximal end, and allows the steering wire 221 provided on the outer snake bone 22 to pass through the gap between the inner snake bone 23 and the outer snake bone 22 . The outer snake bone 22 and the inner snake bone 23 can be made of stainless steel, nickel-titanium alloy or other metal materials. The traction wire 27 can be coated with a pipe material that reduces friction, and is made of PTFE or other polymer materials. As shown in FIG. 2 , the sheath 2 also includes a common section, which includes an outer sheath 25 and an inner tube 26 . The inner tube 26 is connected to the outer snake bone 22. The inner tube 26 is in the form of a flexible snake bone or a spring tube, and is made of stainless steel, NiTi alloy or other metal materials. The guarantee tube 21 covers the outside of the outer snake bone 22, and the outer sheath tube 25 covers the outside of the inner tube 26. The material of the outer sheath tube 25 is a polymer material with relatively high lubricating properties, and the material of the guarantee tube 21 is a highly elastic polymer material. In this embodiment, when the outer snake bone 22 is in a bent state, when the pliers head 1 is closed, pulling the traction wire 27 in a direction away from the pliers head 1 will cause the traction wire 27 to be close to the inner wall of the inner snake bone 23. At this time, due to The locking structure (not shown in the figure, belonging to the prior art) provided on the inner snake bone 23 enables the inner snake bone 23 to support the traction wire 27, thereby avoiding affecting the bending state of the outer snake bone 22 and solving the problem of the pliers head. 1. The opening and closing and bending angles interfere with each other. The tip of the traction forceps adopts a snake-bone structure, which can easily achieve 180° bidirectional bending of the head. The inner snake bone 23 can effectively reduce the deformation or control interference caused by the force of the pulling wire 27 on the outer snake bone 22 when the pliers head 1 is opened and closed.

In one embodiment, the outer snake bone 22 is adapted to bend at 270° in both directions. In this embodiment, the outer snake bone 22 can bend at a maximum of 270° in two opposite directions. The outer snake bone 22 is directly adjacent to or in contact with the bendable part of the endoscope, and its large bending angle will inevitably cause The entire sheath 2 has better followability.

In one embodiment, the inner snake bone 23 is adapted to bend 180° in both directions. In this embodiment, the inner snake bone 23 can be bent at a maximum of 180° in two opposite directions, which can better match the outer snake bone 22 and improve the followability of the entire sheath 2 .

In one embodiment, the axial proximal ends of the outer snake bone 22 , the inner snake bone 23 and the snake bone takeover 24 are fixedly connected; the inner snake bone 23 remains free to move at the end close to the clamp head 1 state. In this embodiment, the proximal end (the end close to the handle 3, also called the rear end) of the outer snake bone 22 and the inner snake bone 23 is connected by the snake bone pipe 24, and the distal end (the end far away from the handle 3, also called the front end) ) can move relatively between the outer snake bone 22 and the inner snake bone 23. When the outer snake bone 22 bends under force, it drives the inner snake bone 23 to bend. Since the proximal end is fixed, the bending angle of the inner snake bone 23 is smaller than that of the outer snake bone 22. The bending angle is such that the front end of the inner snake bone 23 extends forward relative to the outer snake bone 22. There is a gap within 5 mm between the inner snake bone 23 and the inner bottom of the plier head 1. The reserved gap here is forward when bending. 23 inner snake bones fill in the extension.

In one embodiment, the steering wire 221 is axially arranged on both sides of the sheath 2 and is suitable for pulling the steering wire on one side toward the pliers head 1 or away from the pliers head 1 . 221 to bend the sheath 2 to different sides. In this embodiment, the steering wire 221 is a continuous whole and is arranged on both sides of the sheath tube 2. The sheath tube 2 can be bent to different sides by applying external forces in different directions to the steering wire 221 on one side. It should be noted that only the head end of the steering wire 221 is connected to the front end of the outer snake bone 22. The steering wire 221 passes through the protruding holes provided on the inner wall of the outer snake bone 22. When the steering wire 221 is pulled, the steering wire 221 will move relative to the front end of the steering wire 221. The outer snake bone 22 slides to a certain extent. During this process, the length of the steering wire 221 in the outer snake bone 22 becomes shorter, and the outer snake bone 22 will be bent. It should be noted that the purpose of this bending is to fine-tune the position of the endoscope after it has been bent to an appropriate position, so that the forceps head 1 can be more accurately brought closer to the tissue to be removed.

In one embodiment, the sheath bending control mechanism includes a bending push button assembly 34 and a roller 35; the bending push button assembly 34 is slidably located in the middle of the lower cover 32 of the handle 3, and the roller 35 is fixedly located. At the rear of the lower cover 32 , the steering wire 221 is fixed by the curved push button assembly 34 and extends to the roller 35 , and is wound tightly around the roller 35 before turning back. In this embodiment, the steering wires 221 are guided and folded by the roller 35 and then arranged on both sides of the lower cover 32, which corresponds to the steering wires 221 being arranged on both sides of the sheath 2 in the previous embodiment; the steering wires 221 are fixed on the curved On the push button assembly 34, as the curved push button assembly 34 moves, the steering wire 221 must be pulled. As shown in Figure 3, the curved push button assembly 34 can move to the left or right. If the movement direction is different, the steering wire 221 will turn. The force directions of the wire 221 are different, and finally the steering wire 221 in the sheath 2 drives the sheath 2 to bend to different sides. The roller 35 connects the steering wire 221 with the second push button 341, so the synchronization is better, and the steering wire on one side is tightened while the steering wire on the other side is relaxed.

In one embodiment, as shown in Figures 3 and 5, the curved push button assembly 34 includes a second push button seat 342. The second push button seat 342 is provided with a steering wire fixing interface. The steering wire 221 is fixed to the steering wire fixed interface; the second push button seat 342 is slidably provided on the inner bottom surface of the lower cover 32, and a second spring 344 is accommodated in the second push button seat 342. The second spring A second clamping block 343 is provided on the top surface of the second clamping block 344. The second clamping block 343 has a second screw 345 with its head facing upward. A second push button 341 is screwed on the second screw 345. In this embodiment, the second push button seat 342 is provided with two steering wire fixing interfaces a and b. The steering wire 221 enters and exits from the interface a through the interface b. The steering wire 221 is fixed on the second push button seat 342. That is, there is no relative motion between the two. It can be seen from Figure 3 that the position of interfaces a and b, that is, the position of the steering wire 221 on the left side is significantly higher than the steering wire 221 on the right side. In Figure 3, the steering wire 221 on the left side is located in the sheath 2 after being extended. On the upper side, the steering wire 221 on the right side in Figure 3 is located on the lower side inside the sheath 2 after being extended. By pushing the second push button 341 to the left or right, the second push button seat 342 can slide to the left or right, causing the steering wire 221 on the left side in Figure 3 to receive a left or right pulling force. Specifically, if the second push button 341 is pushed to the left (that is, in the direction of approaching the pliers 1, or moved forward), the steering wire 221a on the left side in Figure 3 will be moved in the direction on the right side of the interface b. The left pulling force causes the steering wire 221b on the right side after being wound and turned back by the roller 35 to receive a pulling force to the right. Then the steering wire 221b on the inner and lower side of the sheath 2 receives a pulling force to the right, and the outer snake bone 22 receives a pulling force on the lower side of the steering wire 221b. When pulled to the right, bending deformation occurs downward. The inner snake bone 23 is squeezed by the deformation of the outer snake bone 22 and bends in the same direction as the outer snake bone 23 . On the contrary, if the second push button 341 is pushed to the right (that is, in the direction away from the pliers 1, or moved backward), the steering wire 221a on the left side in Figure 3 will be pushed to the right on the left side of the interface a. Pulling force, the steering wire 221a on the upper inner side of the sheath 2 is pulled to the right, the outer snake bone 22 is pulled to the right by the upper steering wire 221a, and bends upward, and the inner snake bone 23 is pulled by the outer snake bone 22 Deformation and extrusion will cause bending deformation in the same direction as the outer snake bone 23 . In this embodiment, the force application direction is changed by the winding and turning of the roller 35, and the two-way bending of the sheath 2 is cleverly realized. The bending angle is related to the moving distance of the second push button 341 and can be determined according to actual needs.

In one embodiment, as shown in Figure 3, the steering wire 221 at least includes an upper steering wire 221a and a lower steering wire 221b, and the upper steering wire 221a and the lower steering wire 221b are separated from each other. or continuous. In this embodiment, as the upper steering wire 221a and the lower steering wire 221b are separated, that is, they are disconnected, one end of the upper steering wire 221a ends at the steering wire fixed interface a, and the lower steering wire 221a ends at the steering wire fixed interface a. One end of the side steering wire 221b ends at the steering wire fixing interface b. If the upper steering wire 221a and the lower steering wire 221b are continuous, that is, they are connected together and form a whole body, there is a space between the steering wire fixing interface a and the steering wire fixing interface b. The cavity allows the steering wire 221 to pass through, but the steering wire 221 is fixed at two points: the steering wire fixed interface a and the steering wire fixed interface b. This separable and continuous design can increase the flexibility of use of the steering wire 221. Especially in the continuous state, the effective length of the upper steering wire 221a and/or the lower steering wire 221b can be easily adjusted. The so-called effective length is Refers to the actual length involved in the bending operation.

In one embodiment, as shown in Figure 7, when the upper side steering wire 221a and the lower side steering wire 221b are continuous, the second push button seat 342 is provided with a first scaling of the steering wire. structure, the first scaling structure of the steering wire is suitable for simultaneously adjusting the effective lengths of the upper steering wire 221a and the lower steering wire 221b. In this embodiment, as the first zooming structure of the steering wire on the second push button seat 342 moves, the effective lengths of the upper steering wire 221a and the lower steering wire 221b can be adjusted simultaneously, and the tightness of the entire device is adjusted accordingly. , including the state of the clamp head 1 in the non-bent state: loose or tight.

In one embodiment, as shown in FIGS. 7(a)-(c) , the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod 346. The adjustment channel is a cavity and extends along the lower cover 32. Extending in the length direction, the adjustment rod 346 is perpendicular to the extension direction of the adjustment channel and penetrates one side wall of the cavity from outside to inside and is rotatably installed on the other side wall of the cavity. The adjustment rod 346 A through hole is provided radially in the middle section of Then wrap the adjusting rod 346 for a certain number of turns. In this embodiment, the adjusting rod 346 can be a dumbbell-shaped screw. The head end is provided with a straight horizontal slot, the middle section is slightly narrower, the tail end is provided with threads that can match the other side wall of the cavity, and the middle section is provided with a through hole. , the adjusting rod 346 can be rotated counterclockwise or clockwise by inserting a tool into the horizontal slot. The steering wire 221 can be wound through the through hole of the adjusting rod 346, or can be wound directly without passing through the through hole. When the previous winding mode is used, when the adjusting rod 346 is rotated, whether it is rotated counterclockwise or clockwise, the effective length of the upper steering wire 221a is shortened, and the effective length of the lower steering wire 221b is shortened when it is rotated clockwise, and the effective length of the lower steering wire 221b is shortened whether it is rotated counterclockwise or clockwise. The hour hand lengthens as it turns. When the latter winding method is used, when the adjusting lever 346 is rotated clockwise, the effective length of the upper steering wire 221a is shortened, and the effective length of the lower steering wire 221b is lengthened. When the adjusting lever 346 is rotated clockwise, the effective length is exactly the opposite, that is, the upper side The effective length of the turning wire 221a is lengthened, and the effective length of the lower turning wire 221b is shortened. A variety of zoom adjustment methods increase the flexibility of use and can be selected according to actual needs.

In one embodiment, as shown in Figure 8, the steering wire 221 includes an upper steering wire 221a, an adjustment steering wire 221c and a lower steering wire 221b in sequence, and the three are continuous; the second push button seat 342 is provided with a second scaling structure of the steering wire. The second scaling structure of the steering wire is suitable for bidirectionally adjusting the upper steering wire 221a and the lower steering wire by bidirectionally scaling the length of the adjusting steering wire 221c. Effective length of 221b. In this embodiment, the adjusting steering wire 221c is a reserved section located between the upper steering wire 221a and the lower steering wire 221b, and is used to adjust the effective length of both sides thereof, thereby increasing the flexibility of use.

In one embodiment, as shown in Figure 8(a)-(c), the second scaling structure of the steering wire includes an adjustment channel, a left adjuster 347 and a right adjuster 348. The adjustment channel is a cavity and extends along The lower cover 32 extends in the length direction, and the left adjuster 347 and the right adjuster 348 are respectively perpendicular to the extension direction of the adjustment channel and penetrate one side wall of the cavity from outside to inside, and are installed to be rotatable in both directions. On the other side of the cavity wall, through holes are opened radially in the middle sections of the left adjuster 347 and the right adjuster 348; the adjustment channel is used as a passage and effective length scaling channel for the steering wire 221. The steering wire 221 is directly wound around the left adjuster 347 and the right adjuster 348 for a certain number of turns respectively or passes through each of the through holes and then wound around the left adjuster 347 and the right adjuster 348 for a certain number of turns respectively. In this embodiment, the entire steering wire 221 is divided into three sections through two adjusters, namely, the upper steering wire 221a and the lower steering wire 221b that respectively control the bending direction of the pliers 1, and the upper steering wire 221b located between the two adjusters. The adjustment steering wire 221c between. The left adjuster 347 can adjust the effective length of the upper steering wire 221a, and the right adjuster 348 can adjust the effective length of the lower steering wire 221b. Similar to the above-mentioned embodiment of the first scaling structure, different winding methods have different adjustment effects. It should be noted that when the method of passing through the through hole and then winding is used, as shown in Figure 8(b)-(c), the transverse groove of the adjuster head is rotated to cause the adjuster to be pierced with the steering wire 221. The position of the through hole is open relative to the adjustment channel (the axial direction of the through hole is parallel to the axial direction of the adjustment channel) or closed (the axial direction of the through hole is perpendicular to the axial direction of the adjustment channel), which is similar to the opening and closing of a valve, and the through hole can be controlled. The steering wire 221 therein is in a locked (see Figure 8 (c)) or relaxed (see Figure 8 (b)) state. By adjusting the length of the upper steering wire 221a and selecting the adjuster to be in a closed state, the tightness of the upper steering wire 221a can be adjusted. By adjusting the length of the lower steering wire 221b and selecting the adjuster to be in the closed state, the tightness of the lower steering wire 221b can be adjusted. By adjusting the lengths of the upper steering wire 221a and the lower steering wire 221b, and selecting both adjusters to be in a closed state, the tightness of the steering wire of the entire system can be adjusted. At the same time, due to the linkage between the steering wire 221 and the second push button seat 342, the force used to control the bending push button assembly 34 also changes, thereby changing the curvature of the associated portion.

In one embodiment, as shown in Figure 6, the handle 3 includes an upper cover 31, and a plurality of clamping slots 311 are provided on the inner top surface of the upper cover 31; the second clamping block 343 has at least one first Two protrusions 3431 are adapted to be inserted into the slot 311 to fix the position of the second push button seat 342. In this embodiment, the movement distance of the second push button 341 in the previous embodiment is locked through the cooperation between the second protrusion 3431 and the slot 311, that is, the bending angle of the sheath 2 is locked. It should be noted that the plurality of slots 311 are arranged at equal intervals, and the size of the interval is related to the adjustment accuracy of the bending angle. The smaller the interval, the higher the adjustment accuracy. Combined with the previous embodiment, before pushing the second push button 341, you need to press the top of the second push button 341. At this time, the second spring 344 below it is compressed to reduce its height, and the second protrusion 3431 on it is released from the lock. out of slot 311 so that it can move freely. After the second push button 341 moves into place, release your hand from the top of the push button 341 so that it rises under the elastic force of the second spring 344, and the second protrusion 3431 on the second push button 341 is inserted into the slot 311 to achieve position locking. .

In one embodiment, as shown in FIG. 6 , the upper cover 31 is provided with a chute 313 , and the second push button 341 extends out of the upper cover 31 through the chute 313 and is adapted to move along the The chute 313 moves back and forth. In this embodiment, the chute 313 provides space for the second push button 341 to move left and right. The movable distance of the second push button 341 can be changed by changing the length of the chute 313, thus setting the sheath tube. 2 bendable angles. The length of the chute 313 is generally the same as the total arrangement length of the plurality of slots 311 .

In one embodiment, as shown in FIG. 6 , the upper cover 31 is provided with a guide groove 312 , and the guide groove 312 is suitable for receiving and guiding the steering wire 221 . In this embodiment, the guide groove 312 limits the position and movement trajectory of the steering wire 221, which can prevent the steering wire 221 from positional deviation under stress and during movement, thereby affecting the accuracy of the bending angle control. The outer top surface of the upper cover 31 can be covered with soft glue to prevent foreign matter from entering and affecting the control.

In one embodiment, a guide sleeve is provided in the guide groove 312 . In this embodiment, the guide sleeve can reduce the frictional resistance of the steering wire 221. The material of the guide sleeve can be made of polymer materials with high lubrication properties.

In one embodiment, as shown in FIG. 5 , the mouth of the receiving cavity of the second push button seat 342 has a second limiting portion 3421 extending inward. In this embodiment, the second limiting portion 3421 can effectively prevent the second blocking block 343 from protruding from the second push button seat 1342.

In one embodiment, as shown in Figures 3 and 4, the clamp head opening and closing control mechanism includes a clamping push button assembly 33 provided at the front of the lower cover 32 of the handle 3. The button assembly 33 includes a first push button seat 332. The first push button seat 332 is provided with a pulling wire fixing interface c, and the pulling wire 27 is fixed to the pulling wire fixing interface c; the first push button seat 332 is slidably disposed on the inner bottom surface of the lower cover 32. A first spring 334 is accommodated in the first push button seat 332, and a first blocking block 333 is provided on the top surface of the first spring 334. The blocking block 333 is built with a first screw 335 with an upward head, and a first push button 331 is screwed on the first screw 335 . In this embodiment, the pulling wire 27 is fixed on the pulling wire fixing interface c, that is, there is no relative movement between the two. By pushing the first push button 331 to the left or right, the first push button seat 332 can slide to the left or right, causing the pulling wire 27 to receive a pulling force to the left or right. Specifically, if the first push button 331 is pushed to the left (that is, in the direction of approaching the pliers 1 , or moved forward), the pulling wire 27 is pushed to the left, and the pliers 1 connected to the pulling wire 27 are pushed And open. On the contrary, if the first push button 331 is pushed to the right (that is, in the direction away from the pliers 1, or moved backward), the pulling wire 27 will be pulled to the right, and the pliers 1 connected to the pulling wire 27 will be pulled and closed. . Both the first push button 331 and the second push button 341 can be operated independently without interfering with each other, and can be used for one-handed operation.

In one embodiment, as shown in Figures 3 and 4, the first block 333 has at least one first protrusion 3331, and the first protrusion 3331 is suitable for being embedded in the upper cover 31 of the handle 3. A plurality of slots 311 are provided to fix the position of the first push button base 332. In this embodiment, through the cooperation between the first protrusion 3331 and the slot 311, the moving distance of the first push button 331 in the previous embodiment is locked, that is, the open or closed state of the pliers 1 is locked. The size of the opening is locked, and the degree of closure is locked when closed, that is, the size of the remaining opening, collectively called the opening and closing degree. It should be noted that the plurality of slots 311 are arranged at equal intervals, and the size of the interval is related to the adjustment accuracy of the opening and closing of the pliers 1. The smaller the interval, the higher the adjustment accuracy. Combined with the previous embodiment, before pushing the first push button 331, you need to press the top of the first push button 331. At this time, the first spring 334 below it is compressed to reduce its height, and the first protrusion 3331 on it is released from the lock. out of slot 311 so that it can move freely. After the first push button 331 moves into place, release your hand from the top of the push button 331 so that it rises under the elastic force of the first spring 334, and the first protrusion 3331 on the push button 331 is inserted into the slot 311 to achieve position locking. .

In one embodiment, as shown in FIG. 4 , the mouth of the receiving cavity of the first push button seat 332 has a first limiting portion 3321 extending inward. In this embodiment, the first limiting portion 3321 can effectively prevent the first blocking block 333 from protruding from the first push button seat 332 .

In one embodiment, the handle 3 includes a stress diffusion tube 36, which is docked with the sheath 2. In this embodiment, the stress diffusion tube 36 can disperse the stress between the sheath 2 and the handle 3, effectively preventing the sheath 2 from deforming at the connection site.

In one embodiment, the specific operation may be as follows:

S1. Operate 3 of the traction pliers, press the second push button 341 downward, the second screw 345 drives the second block 343 to move downward, the second spring 344 is compressed, and the second protrusion 3431 on the second block 343 Disengage downward from the slot 1311 of the upper cover 131, press the second push button 1341 and push it toward the pliers 11. The second push button base 1342 moves forward, and the steering wire 1221b connected to the interface b is pulled forward. The guiding function of the roller 135 actually causes the lower steering wire 1221b inside the outer snake bone 122 to move backward. The outer snake bone 122 is pulled and deformed by the steering wire 1221b, and bends and deforms downward. The inner snake bone 123 is affected by the outer snake bone 122. Deformation and extrusion will cause bending deformation in the same direction as the outer snake bone 123. When bent to an appropriate angle, the operator releases the second push button 1341, and the second spring 1344 built in the second push button seat 1342 rebounds, pushing the second block 343 upwards back into the corresponding slot 311. The second clamping block 343 cooperates with the clamping groove 331 to fix the bending push button assembly 34, thereby fixing the position of the steering wire 221b relative to the outer snake bone 22, and locking and maintaining the bending angle unchanged.

S2. Press the second push button 341 downward, the second screw 345 drives the second block 343 to move downward, the second spring 344 is compressed, and the second protrusion 3431 on the second block 343 separates downward from the upper cover 31 of the slot 311, press the second push button 341 and push it in the direction away from the pliers 1, the second push button base 342 moves backward, the steering wire 221a connected to the interface a is pulled to move backward, and the steering wire 221a connected to the interface b is moved backward. The steering wire 221b moves backward. After being guided by the roller 35, the steering wire 221b moves forward. For the outer snake bone 22, the upper steering wire 221a tightens, the lower steering wire 221b relaxes, and the outer snake bone 22 moves toward the tightened steering wire. direction, that is, upward bending deformation occurs, the inner snake bone 23 is deformed and squeezed by the outer snake bone 22, and bending deformation occurs in the same direction as the outer snake bone 23. When bent to an appropriate angle, the operator releases the second push button 341, and the second spring 344 built in the second push button seat 342 rebounds, pushing the second block 343 upwards back into the corresponding slot 311. The second clamping block 343 cooperates with the clamping groove 331 to fix the bending push button assembly 34, thereby fixing the position of the steering wire 221 relative to the outer snake bone 22, and locking and maintaining the bending angle unchanged.

S3. Press the first push button 331 downward, the first screw 335 drives the first block 333 to move downward, the first spring 334 is compressed, and the first protrusion 3331 on the first block 333 separates downward from the upper cover 31 In the slot 311, press the first push button 331 and push it in the direction of the pliers head 1. The first push button base 332 pushes the traction wire 27 to move forward, and the traction wire 27 pushes the pliers head 1 to open. When it is opened to the appropriate position, the operator releases the first push button 331, and the first spring 334 rebounds, pushing the first block 333 upwards back into the corresponding slot 311, and the first block 333 cooperates with the slot 331. , the clamping push button assembly 33 is fixed, and the position of the pulling wire 27 relative to the pliers head 1 is fixed, and the locking keeps the open position of the pliers head 1 unchanged, that is, the opening size remains unchanged.

S4. Press the first push button 331 downward, the first screw 335 drives the first block 333 to move downward, the first spring 334 is compressed, and the first protrusion 3331 on the first block 333 separates downward from the upper cover 31 In the slot 311, press the first push button 331 and push it away from the pliers head 1. The first push button seat 332 pushes the pulling wire 27 to move backward, and the pulling wire 27 pulls the pliers head 1 to close. When it is closed to the appropriate position, the operator releases the first push button 331, and the first spring 334 rebounds, pushing the first block 333 upwards back into the corresponding slot 311, and the first block 333 cooperates with the slot 331. , the clamping push button assembly 33 is fixed, thereby fixing the position of the pulling wire 27 relative to the pliers head 1, and the locking keeps the closed position of the pliers head 1 unchanged, that is, the size of the remaining opening remains unchanged. When the outer snake bone 22 is bent, when the pliers head 1 is closed, pulling the traction wire 27 in the direction away from the pliers head will cause the traction wire 27 to be close to the inner wall of the inner snake bone 23. The locking structure enables the inner snake bone to support the traction wire 27, thereby avoiding affecting the bending state of the outer snake bone 22, and solving the problem of mutual interference between the opening and closing and bending angle of the plier head 1.

S5. According to the actual needs of the surgical process, continuously repeat two or more steps in S1-S4 above to achieve the auxiliary traction function for endoscopic surgery.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims

An auxiliary traction forceps for endoscopic surgery, which is characterized in that it includes a forceps head, a sheath and a handle connected in sequence; the sheath has a bendable section, and a steering wire and a traction wire are accommodated and fixed in the bendable section; One end of the steering wire is connected to a sheath bending control mechanism of the handle. The sheath bending mechanism is adapted to achieve bidirectional bending of the bendable section of the sheath by pulling the steering wire in two directions and lock and maintain the bending angle. ; One end of the pulling wire is connected to the clamp head opening and closing control mechanism of the handle, and the other end is connected to the clamp head. The clamp head opening and closing control mechanism is suitable for pulling the pulling wire in two directions to achieve the above The plier head opens and locks to maintain the open and closed state.
The auxiliary traction forceps for endoscopic surgery according to claim 1, characterized in that the bendable section of the sheath tube is a multi-layer composite structure, which is composed of a wrapping tube, an outer snake bone, a steering wire, and a snake bone take-over from outside to inside. and an inner snake bone; the traction wire is accommodated and passes through the inner snake bone; both the outer snake bone and the inner snake bone are suitable for bidirectional bending.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the outer snake bone is suitable for bending at 270° in both directions.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the inner snake bone is suitable for bending at 180° in both directions.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the axial proximal ends of the outer snake bone, the inner snake bone and the snake bone takeover are fixedly connected; One end of the clamp head remains free to move.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the steering wire is axially arranged on both sides of the sheath and is adapted to move toward or away from the forceps head. Pulling the steering wire on one side in one direction causes the sheath to bend to different sides.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the sheath bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably provided on the lower cover of the handle. In the middle part, the roller is fixed at the rear of the lower cover; the steering wire is fixed by the curved push button assembly and extends to the roller, and is wound tightly around the roller before turning back.
The auxiliary traction forceps for endoscopic surgery according to claim 7, wherein the curved push button assembly includes a second push button seat, and a steering wire fixing interface is provided on the second push button seat. The wire is fixed to the steering wire fixed interface; the second push button seat is slidably located on the inner bottom surface of the lower cover, and a second spring is accommodated in the second push button seat. The top surface of the second spring A second clamping block is provided, and a second screw with an upward head is built in the second clamping block, and a second push button is screwed on the second screw.
The auxiliary traction forceps for endoscopic surgery according to claim 8, wherein the steering wire at least includes an upper steering wire and a lower steering wire, and a gap between the upper steering wire and the lower steering wire is Phase separation or phase continuity.
The auxiliary traction forceps for endoscopic surgery according to claim 9, characterized in that when the upper steering wire and the lower steering wire are continuous, the second push button seat is provided with a steering The first scaling structure of the steering wire is adapted to simultaneously adjust the effective lengths of the upper steering wire and the lower steering wire.
The auxiliary traction forceps for endoscopic surgery according to claim 10, wherein the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod, and the adjustment channel is a cavity and extends along the length direction of the lower cover. Extend, the adjusting rod is perpendicular to the extension direction of the adjusting channel and passes through one side wall of the cavity from outside to inward and is rotatably mounted on the other side wall in a bidirectional manner. The middle section of the adjusting rod is radially A through hole is provided; the adjustment channel is used as a passage and effective length scaling channel for the steering wire, and the steering wire directly wraps around the adjusting rod for a certain number of turns or passes through the through hole and then wraps around the adjusting rod. A certain number of turns.
The auxiliary traction forceps for endoscopic surgery according to claim 9, wherein the steering wires include an upper steering wire, an adjustment steering wire and a lower steering wire in order, and the three are continuous; the second steering wire includes: The push button seat is provided with a second scaling structure of the steering wire. The second scaling structure of the steering wire is suitable for bidirectionally adjusting the upper steering wire and the lower steering wire by bidirectionally scaling the length of the adjusting steering wire. effective length.
The auxiliary traction forceps for endoscopic surgery according to claim 12, wherein the second scaling structure of the steering wire includes an adjustment channel, a left adjuster and a right adjuster, and the adjustment channel is a cavity and extends along the The lower cover extends in the length direction, and the left adjuster and the right adjuster are respectively perpendicular to the extension direction of the adjustment channel and pass through one side wall of the cavity from the outside to the inside, and are rotatably installed in the other side cavity in a bidirectional manner. On the wall, the middle sections of the left adjuster and the right adjuster are both radially provided with through holes; the adjustment channel is used as a passage and effective length scaling channel for the steering wire, and the steering wire is directly wrapped around the left side respectively. The adjuster and the right adjuster are wound around the left adjuster and the right adjuster for a certain number of turns respectively or after passing through each of the through holes.
The auxiliary traction forceps for endoscopic surgery according to claim 8, wherein the handle includes an upper cover, and a plurality of clamping grooves are provided on the inner top surface of the upper cover; and the second clamping block has at least A second protrusion, the second protrusion is adapted to be inserted into the slot to fix the position of the second push button base.
The auxiliary traction forceps for endoscopic surgery according to claim 14, wherein the upper cover is provided with a chute, and the second push button extends out of the upper cover through the chute and is suitable for Move back and forth along the chute.
The auxiliary traction forceps for endoscopic surgery according to claim 14, wherein the upper cover is provided with a guide groove, and the guide groove is adapted to accommodate and guide the steering wire.
The auxiliary traction forceps for endoscopic surgery according to claim 16, wherein a guide sleeve is provided in the guide groove.
The auxiliary traction forceps for endoscopic surgery according to claim 8, wherein the mouth of the receiving cavity of the second push button seat has a second limiting portion extending inward.
The auxiliary traction forceps for endoscopic surgery according to claim 2, wherein the forceps head opening and closing control mechanism includes a clamping push button assembly located at the front of the lower cover of the handle, and the clamping forceps The push button assembly includes a first push button seat. The first push button seat is provided with a traction wire fixing interface, and the traction wire is fixed to the traction wire fixation interface; the first push button seat is slidably provided on the On the inner bottom of the lower cover, a first spring is accommodated in the first push button seat. A first clamping block is provided on the top surface of the first spring. A first screw with an upward head is built in the first clamping block. , a first push button is screwed on the first screw.
The auxiliary traction forceps for endoscopic surgery according to claim 19, characterized in that the first clamping block has at least one first protrusion, and the first protrusion is adapted to be embedded in the upper cover of the handle. A plurality of slots are provided to fix the position of the first push button base.
The auxiliary traction forceps for endoscopic surgery according to claim 19, wherein the mouth of the receiving cavity of the first push button seat has a first limiting portion extending inward.
The auxiliary traction forceps for endoscopic surgery according to claim 1, wherein the handle includes a stress diffusion tube, and the stress diffusion tube is docked with the sheath.