CN114451855B

CN114451855B - Traction mechanism and appendicoscope

Info

Publication number: CN114451855B
Application number: CN202210391090.6A
Authority: CN
Inventors: 张剑; 刘孟华; 沈和良; 万继宪
Original assignee: Hangzhou Lainset Medical Technology Co ltd
Current assignee: Hangzhou Lainset Medical Technology Co ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-07-12
Anticipated expiration: 2042-04-14
Also published as: CN114451855A

Abstract

The invention provides a traction mechanism for an appendoscope, which comprises a driving wheel for drawing a traction line, and is characterized by further comprising a supporting frame and a driving arm arranged on the driving wheel, wherein the driving arm is provided with a first slotted hole, the first slotted hole is provided with a first opening facing one side of the traction line, the first slotted hole allows a line body of the traction line to pass through and prevents the head of the traction line from passing through, the supporting frame is used for keeping the traction line at a preset position after the driving arm is separated from being in contact with the traction line along with the rotation of the driving wheel, and when the traction line is at the preset position and the driving arm is in contact with the traction line along with the rotation of the driving wheel, the first slotted hole supports the head of the traction line and draws the traction line. The invention can prevent the fracture risk caused by bidirectional bending when the intensity of the traction wire is higher. The invention also provides an operation part comprising the traction mechanism and the appendix.

Description

Traction mechanism and appendicoscope

Technical Field

The invention relates to the field of endoscopes used as medical instruments, in particular to a traction mechanism of an appendicoscope.

Background

Appendectomy has been the main means for treating acute appendicitis, and in recent years, with the development of endoscopic minimally invasive diagnosis and treatment technologies, many diseases can be effectively treated on the basis of organ preservation. The introduction of treatment of acute obstructive suppurative cholangitis by ERCP (Endoscopic Retrograde Cholangiopancreatography) was introduced in "management and research on scientific and technological achievements" published in phase 2 of 2015, and a research team in the area of teaching and teaching of melting of Liu Ice in the second hospital affiliated to the university of Harbin Bin medical science assumed that obstruction of appendiceal lumens can be rapidly relieved by Endoscopic technique, so that the dilated appendiceal lumens are reduced, and stimulation to internal nerves is reduced; drainage pus, control inflammation, promote ulcer healing, reduce stimulation of serosa exudation to local peritoneum, thereby achieving the purposes of quickly relieving abdominal pain and curing acute uncomplicated appendicitis, and preventing appendiceal gangrene and perforation. Because the appendix opening is positioned in the cecum and is a conventional anatomical mark for colonoscopy, the form of the appendix opening can be directly observed through the colonoscope, the diagnosis of appendicitis is definite, and the operations of intubation, suction and decompression, radiography, flushing, stent drainage and the like are carried out on the appendix lumen by using the ERCP related catheter and guide wire technology, so that the obstruction of the appendix lumen can be quickly relieved, the acute uncomplicated appendicitis can be effectively treated under the condition of reserving the appendix, and appendiceal gangrene or perforation can be prevented. Professor Liu Bing named this method as Endoscopic Retrograde Appendicitis Therapy (ERAT). The article indicates that, compared to traditional treatment methods, ERAT can rapidly alleviate symptoms, reduce the chances of recurrence, avoid the effects of long-term antibiotic use on intestinal flora, avoid surgical trauma, preserve appendiceal function, and improve quality of life.

However, the appendix, located between the cecum and ileum, is the elongated and curved cecum with its root connected to the posterior medial wall of the cecum, free and locked at its distal end, widely varying in range of motion, and extending to any position in the abdominal cavity. An article, namely technical introduction of endoscopic retrograde appendicitis treatment, published in China J.E. Colorum disease, volume 1, phase 2, 2012 indicates that the opening of the appendix is often covered by Gerlach's flaps, which causes difficult intubation. The "analysis of surgical technique and efficacy of endoscopic retrograde appendicitis treatment", published in journal of the university of western medicine (medical edition), volume 37, stage 4, at 2016 (7 th month), indicated that intubation was the most difficult and critical step in each of the ERAT steps, due to two reasons: firstly, the position of the appendix has more variation, and the inner orifice of the appendix is not necessarily at the position facing the endoscope; secondly, the colonoscope used by ERAT does not have a forceps-lifting device, and the direction of the catheter can not be adjusted by the forceps-lifting device after the catheter extends out of the head end of the endoscope during intubation.

Therefore, there is a need for an endoscope that can be adapted for use in intubation procedures in ERAT surgery.

Patent document No. CN207752226U discloses an overload protection mechanism for an endoscope traction wire, and an endoscope, wherein the overload protection mechanism includes: the device comprises a stinger assembly, a camera assembly connected with the stinger assembly, at least one traction wire, a pressure sensor, a rotating disc, a driving assembly and a controller; the side surface of the rotating disc is provided with a connecting part; the first end of the traction wire penetrates through the connecting part of the rotating disc to be connected with the pressure sensor, and the second end of the traction wire penetrates through the insertion pipe assembly and is connected with the camera assembly; the driving assembly is connected with the rotating disc and used for driving the rotating disc to rotate; the controller is electrically connected with the driving assembly and the pressure sensor and used for driving the driving assembly to operate according to a pressure signal transmitted by the pressure sensor, so that the endoscope traction wire is effectively protected and prevented from being broken due to overload. The overload protection mechanism of endoscope pull wire that this patent document provided senses the pressure that bears when pulling the line and driving down with the rolling disc connecting portion butt through pressure sensor in real time to transmit the pressure signal who measures to the controller that is used for controlling drive assembly drive rolling disc pivoted, so that the controller obtains corresponding pressure value according to the pressure signal of pressure sensor transmission, and when the pressure value exceeded preset pressure threshold, control drive assembly stop to drive the rolling disc and continue to rotate, thereby realize the effective protection to endoscope pull wire, prevent its overload fracture. That is, this patent document is to protect the traction wire by "stopping traction", and does not provide a technical solution capable of providing a large traction force.

Disclosure of Invention

The invention provides a traction mechanism for an appendoscope, which is suitable for a tube inserting step in an ERAT treatment operation.

After the introduction of ERAT diagnosis and treatment, the industry is gradually aware that ERAT can diagnose appendicitis, lavage, remove the calculus, place a stent and the like by using a radiographic technique, but can not directly view images in the appendiceal cavity, can not completely eliminate the existence of tumors in the appendiceal cavity, and can not achieve the goal of accurately treating appendiceal calculus. Therefore, on the basis of ERAT principle, the scholars propose to apply a disposable electronic endoscope sub-scope to pass through the working channel of the colonoscope to enter the appendiceal cavity to carry out diagnosis and treatment activities. For clarity, the present application defines the above-described single use electronic endoscope sub-scope for ERAT as a single use electronic appendix endoscope, abbreviated as an appendoscope or appendix endoscope.

An endoscope generally includes an elongated insertion portion, and an operation portion provided on a proximal end side of the insertion portion. The insertion portion is provided with a leading end portion, a curved portion, and a flexible tube portion in this order from the distal end. The pull wire is connected with the operation part and the far end of the bending part, and an operator can pull and loosen the pull wire by controlling the operation part, so that the bending of the bending part is controlled.

The applicant researches an endoscope used as an appendicoscope in the prior art, combines the physiological characteristics of the appendix and the characteristics of ERAT diagnosis and treatment, and finds that the bending strength of a bending part can be increased in order to adapt to the problem of high insertion difficulty of the intubation in the ERAT diagnosis and treatment; in order to provide greater bending strength, the strength of the traction wire needs to be improved; however, when the strength of the pull wire is increased, the rigidity of the pull wire is increased, the toughness is decreased, and the pull wire is easily broken after being bent. Specifically, it has been found that two pull wires are symmetrically disposed within the housing of the operating portion, with proximal ends fixed to either side of the drive wheel, one pull wire being pulled and the other being released when the drive wheel is controlled to rotate. At this time, the pulling wire in the relaxed state is fixed to the driving wheel at its proximal end, and the portion thereof near the proximal end is bent backward as the driving wheel rotates. In other words, the proximal portion of each traction wire bends along the drive wheel to one side when under tension (defined as positive bending) and to the other side when under slack (defined as negative bending) as the drive wheel rotates, which results in the traction wire undergoing a bi-directional bend that is prone to breakage when the traction wire is less flexible.

In order to solve the technical problem, an embodiment of the invention discloses a traction mechanism for an appendixes, which comprises a driving wheel for drawing a traction line, and further comprises a supporting frame and a driving arm arranged on the driving wheel, wherein the driving arm is provided with a first slotted hole, the first slotted hole is provided with a first opening facing one side of the traction line, the first slotted hole allows a line body of the traction line to pass through and prevents a head of the traction line from passing through, the supporting frame is used for keeping the traction line at a preset position after the driving arm is rotated along with the driving wheel to be separated from contact with the traction line, and when the traction line is at the preset position and the driving arm is rotated along with the driving wheel to contact with the traction line, the first slotted hole supports the head of the traction line and draws the traction line.

By adopting the technical scheme, taking a pull wire on one side as an example, when the driving wheel rotates towards the direction of pulling or pulling the pull wire (for example, clockwise rotation), the function that the driving wheel controls the bending part of the insertion part through the pull wire can be normally realized; when the driving wheel rotates towards the reverse direction (such as anticlockwise rotation) for drawing or pulling the traction wire, the first slotted hole allows the wire body of the traction wire to pass through and prevents the head of the traction wire from passing through, which means that the driving arm is separated from the contact with the traction wire when the driving wheel rotates anticlockwise, so that the driving wheel does not drive the traction wire to bend reversely when rotating anticlockwise. On the contrary, if the traction wire is fixedly connected to the driving wheel as in the prior art without the above technical solution, the traction wire cannot be disengaged from the traction wire when the driving wheel rotates counterclockwise, and the traction wire rotates along with the counterclockwise rotation of the driving wheel, causing a reverse bending. The pull wire is equivalent to being bent in the positive direction when being pulled or pulled; and is forced to reverse bend when not being pulled or pulled, thereby causing a bi-directional bend with a risk of breakage.

Also taking the above-mentioned one-sided traction wire as an example, when the traction wire is out of contact with the driving wheel, the traction wire is supported by the supporting frame and can be basically kept in the original position due to the self-rigidity effect of the traction wire. When the driving wheel rotates towards the direction of drawing or pulling the traction line again (for example, clockwise rotation), the first slotted hole rotating along with the driving wheel receives the traction line and the head part thereof again, and then the traction or pulling of the traction line can be completed again.

According to another embodiment of the invention, the traction mechanism is disclosed, wherein the support frame has a second slot for allowing the wire body of the traction wire to pass through, for keeping the traction wire in a predetermined position after the driving arm is rotated out of contact with the traction wire with the driving wheel.

By adopting the technical scheme, the traction wire can be kept at the original position more accurately when being separated from the contact with the driving arm, so that the traction wire is smoothly pulled or dragged by the driving arm when the driving wheel rotates reversely.

Furthermore, the second slot hole is provided with a second opening facing to one side of the traction wire.

The second opening is arranged, so that the assembly efficiency between the traction wire and the second slotted hole is improved.

Further, the second slot prevents the head of the pull wire from passing through.

Therefore, the second slotted hole allows the wire body of the traction wire to pass through, but does not allow the head of the traction wire to pass through, which is equivalent to setting smaller radial dimension, and is beneficial to more accurately keeping the original position of the traction wire when the traction wire is separated from the contact with the driving arm, so that the traction wire can be smoothly butted with the driving arm when the driving wheel rotates reversely.

According to another embodiment of the invention, the first opening is in a bell mouth shape in a top view, and the maximum width of the first opening is smaller than the radial size of the head of the traction line.

Still take above-mentioned one side pull wire as an example, when the drive arm rotated along with the drive wheel anticlockwise, the first opening of bell-mouth shape was close gradually and was allowed the line body to get into first slotted hole from first opening in the radial of the line body of pull wire, when the position of pull wire had great change when relative to its position of breaking away from the drive arm, as long as in the maximum width range of bell-mouth, this technical scheme allowed the position of pull wire to take place certain deviation, did not influence the butt joint once more of pull wire and drive arm.

Further, the outermost side of the cantilever end of the first opening is tilted upward in a side view.

Thus, when the driving arm receives the head of the traction wire, the traction wire is prevented from being separated from the first slotted hole along the first opening.

Furthermore, the cantilever end of the first opening is gradually tilted from inside to outside to form a slope section, and the minimum width of the bell mouth is positioned on the slope section.

In this application, the minimum width of the first opening may be the same as the width of the first slot hole, and the above technical solution is adopted, that is, the minimum width of the bell mouth is located at the slope section, and the slope section with the minimum width forms a lateral support for the head of the traction wire, thereby being beneficial to preventing the head of the traction wire from being separated from the first slot hole. This effect is particularly pronounced when the traction line is drawn by the drive wheel.

Further, the distance between the side wall of the first slotted hole facing the traction wire and the lowest part of the slope section is basically equal to the wire body diameter of the traction wire.

This arrangement is advantageous in preventing the wire from penetrating too deeply into the first slot, which may cause the wire to be difficult to disengage when it is disengaged from the first slot.

The embodiment of the invention also discloses an operation part of the appendices based on the traction mechanism, which comprises a shell and the traction mechanism, wherein the driving wheel is rotatably fixed on the shell, and the supporting frame is fixed on the shell.

By adopting the technical scheme, the appendoscope suitable for the intubation step in the ERAT treatment can be provided.

Furthermore, the operation part of the appendix also comprises a knob arranged outside the shell, and the driving wheel is connected with the knob and driven by the knob to rotate.

The embodiment of the invention also discloses an appendicoscope based on the traction mechanism, which comprises an insertion part with a bending part, an operation part, a traction wire for connecting the operation part and the bending part, the traction mechanism, a driving wheel for connecting the operation part and the traction wire for connecting the bending part.

Drawings

Fig. 1 is a schematic diagram illustrating an endoscope serving as an endoscope according to an embodiment of the present invention.

Fig. 2 shows a schematic view of a reverse-bent state of a traction wire which is not in a pulling state in the prior art.

Fig. 3 is a schematic diagram illustrating a state where a driving arm of a traction mechanism for an aperture stop receives a head of a traction wire according to an embodiment of the present invention.

FIG. 4 is a schematic diagram showing a pull line of a pull mechanism for an aperture stop disengaged from a drive arm, according to an embodiment of the present invention.

Fig. 5 is a schematic top view of a driving wheel according to an embodiment of the present invention.

Fig. 6 is a schematic view showing a state in which the driving arm in fig. 5 receives the head of the traction wire.

Fig. 7 is an enlarged view of a in fig. 6.

Figure 8 is a schematic view of the structure of the drive arm of figure 1.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that the features of the invention be limited to that embodiment. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.

In the description of the present embodiment, it should be noted that the terms "near" and "far" are relative positional relationships, and when an operator operates an instrument to treat a target object, along the instrument, the side close to the operator is "near" and the side close to the target object is "far".

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

Fig. 1 shows a schematic configuration of an endoscope as an aperture 1 according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides an aperture mirror 1 including an elongated insertion portion 2, and an operation portion 3 provided on a proximal end side of the insertion portion 2. That is, the present invention provides an appendicoscope 1 including an insertion portion 2 and an operation portion 3 connected to each other.

As shown in fig. 1, the insertion portion 2 is provided with a distal end portion, a curved portion 21, and a flexible tube portion in this order from the distal end. The pull wire 4 is connected with the operation part 3 and the far end of the bending part 21, and an operator can pull and loosen the pull wire 4 by controlling the operation part 3, so that the bending of the bending part 21 is controlled.

The applicant has found that in the prior art, in the housing of the operating part, as shown in fig. 2, two traction wires are symmetrically arranged, and the proximal ends are fixed to both sides of the driving wheel, and when the driving wheel is controlled to rotate, one traction wire (shown by a solid line on the right in fig. 2) is pulled, and the other traction wire (shown by a broken line on the left in fig. 2) is loosened. The traction wire in a relaxed state (shown in phantom on the left in fig. 2) is bent back as the drive wheel rotates due to its proximal end being fixed to the drive wheel. In other words, the proximal portion of each traction wire bends under tension along the drive wheel to one side (defined as positive bending) and bends under slack conditions along the drive wheel to the other side (defined as negative bending), which results in the traction wire undergoing a bi-directional bend that is susceptible to breakage in the case of less flexible traction wires.

As shown in fig. 3, an embodiment of the present invention discloses a traction mechanism for an aperture 1, comprising a driving wheel 5 for pulling a traction wire 4, a support frame 6 and a driving arm 8 arranged on the driving wheel 5.

As shown in fig. 5 to 7, the driving arm 8 is provided with a first slot 81, the first slot 81 is provided with a first opening 82 facing one side of the traction wire 4, and the first slot 81 allows the wire body 42 of the traction wire 4 to pass through but prevents the head 41 of the traction wire 4 from passing through (as shown in fig. 7). In other words, the maximum width of the first slot 81 is greater than the radial dimension of the wire body 42 of the traction wire 4 and less than the radial dimension of the head 41 of the traction wire 4.

The support frame 6 serves to maintain the traction wire 4 at a predetermined position after the driving arm 8 is rotated counterclockwise with the driving wheel 5 out of contact with the traction wire 4 as shown in fig. 4, and the first slot 81 supports the head 41 of the traction wire 4 and pulls the traction wire 4 when the driving arm 8 is rotated clockwise with the driving wheel 5 to contact the traction wire 4 when the traction wire 4 is at the predetermined position as shown in fig. 3.

In the present embodiment, the pull wire 4 shown in fig. 3 and 4 is taken as an example, and when the drive wheel 5 rotates in a direction to pull or drag the pull wire 4 (clockwise rotation), the function of the drive wheel 5 to control the bending portion 21 of the insertion portion 2 by the pull wire 4 can be normally realized; when the driving wheel 5 rotates in the opposite direction (counterclockwise rotation) to pull or drag the traction wire 4, since the first opening 82 allows the wire body 42 of the traction wire 4 to pass out of the first slot 81 (as shown in fig. 7), it means that the driving arm 8 will be out of contact with the traction wire 4 when the driving wheel 5 rotates counterclockwise, so that the driving wheel 5 will not bring the traction wire 4 to bend reversely when rotating counterclockwise. On the contrary, if the traction wire 4 is fixedly connected to the driving wheel 5 as in the prior art without using the above-mentioned technical solution, the traction wire 4 cannot be disengaged from the traction wheel 5 when the driving wheel 5 rotates counterclockwise, and the traction wire 4 rotates with the counterclockwise rotation of the driving wheel 5, causing a reverse bending. The pull wire 4 is equivalent to being bent in the positive direction when being pulled or pulled; and is forced to reverse bend when not being pulled or pulled, thereby causing a bi-directional bend with a risk of breakage.

Also taking the traction wire 4 shown in fig. 4 as an example, when the traction wire 4 is disengaged from the driving wheel 5, the traction wire 4 is supported by the supporting frame 6 and can be substantially maintained in its original position due to its own stiffness. When the driving wheel 5 rotates again (rotates clockwise) in the direction of pulling or pulling the pulling wire 4, the first slot 81 rotating with the driving wheel 5 receives the pulling wire 4 and the head 41 thereof again, that is, the wire body 42 of the pulling wire 4 passes through the first opening 82 and enters the first slot 81, the head 41 of the pulling wire 4 is lifted because the head cannot pass through the first slot 81, and the driving wheel 5 can complete the pulling or pulling of the pulling wire 4 again.

In this embodiment, as shown in fig. 3 and 4, the support bracket 6 has a second slot 61, the second slot 61 allowing the wire body 42 of the traction wire 4 to pass through (i.e., the maximum width of the second slot 61 is greater than the radial dimension of the wire body 42 of the traction wire 4) for maintaining the traction wire 4 in a predetermined position after the drive arm 8 rotates out of contact with the traction wire 4 with the drive wheel 5. So set up, be favorable to pull wire 4 to keep original position more accurately when breaking away from contact with actuating arm 8 to smoothly dock with actuating arm 8 and receive again the drawing or drawing of actuating arm 8 when drive wheel 5 counter rotation.

In other embodiments, the second slot 61 may be provided with a second opening (not shown) facing the side of the traction wire 4. The second opening (not shown) is provided to improve the assembling efficiency between the pulling wire 4 and the second slot 61.

In other embodiments, the second slot 61 can be sized to prevent the head 41 of the pull wire 4 from passing through, i.e., the maximum width of the second slot 61 is less than the radial dimension of the head 41 of the pull wire 4. In this way, the second slot 61 allows the wire body 42 of the traction wire 4 to pass through, but does not allow the head 41 of the traction wire 4 to pass through, which is equivalent to a smaller radial dimension, which does not affect the original function, and is also beneficial to more accurately maintain the original position of the traction wire 4 when the traction wire is separated from the contact with the driving arm 8, so as to smoothly abut against the driving arm 8 when the driving wheel 5 rotates reversely.

Another embodiment of the present invention provides a pulling mechanism, as shown in fig. 5 to 7, wherein the first opening 82 is flared in a top view, and the maximum width 71 (shown in fig. 7) is smaller than the radial dimension of the head 41 of the pulling wire 4.

Still taking the above-mentioned traction wire 4 as an example, when the driving arm 8 rotates counterclockwise along with the driving wheel 5, the first opening 82 in the shape of a bell mouth gradually approaches along the radial direction of the wire body 42 of the traction wire 4 and allows the wire body 42 to enter the first slot 81 through the first opening 82, when the position of the traction wire 4 is greatly changed relative to the position when the traction wire is separated from the driving arm 8, as long as the position is within the range of the maximum width 71 of the bell mouth, the traction wire 4 can still be smoothly butted with the driving arm 8 when the driving wheel 5 rotates in the reverse direction. That is, this solution allows a certain deviation of the position of the traction wire 4 without affecting the re-docking of the traction wire 4 with the drive arm 8.

In yet another embodiment, as shown in FIG. 8, the outermost side of the cantilevered end of the first opening 82 is tilted upward in a side view. This advantageously prevents the pull wire 4 from exiting the first slot 81 along the first opening 82 when the drive arm 8 receives the head 41 of the pull wire 4.

In other embodiments, as shown in FIG. 8, the first opening 82 may be configured such that the cantilevered end thereof gradually tilts from the inside to the outside to form a ramp segment 84, as shown in FIG. 7, with the minimum flare width 72 (shown in FIG. 7) being located in the middle of the ramp segment 84 rather than at the edge of the ramp segment 84. The lowest position of the drive arm 8, i.e. the edge of the ramp section 84, is shown by reference line X in fig. 7, 8. In this embodiment, the minimum width 72 of the first opening 82 may be the same as the width of the first slot 81, and the above-mentioned solution is adopted, that is, the minimum width 72 of the flare is located in the middle of the slope section 84 rather than at the edge, and the slope section 84 with the minimum width 72 forms a lateral support for the head 41 of the traction wire 4, which is beneficial to prevent the head 41 of the traction wire 4 from being separated from the first slot 81. This effect is particularly pronounced when the traction sheave 4 is pulled by the drive wheel 5.

In a further embodiment of the present application, as shown in fig. 7, the distance between the side wall 83 of the first slotted hole 81 facing the traction wire 4 and the lowest point of the sloping segment 84 (indicated by the reference line X) is substantially equal to or may be slightly larger than the diameter of the wire body 42 of the traction wire 4. This arrangement is advantageous in preventing the traction wire 4 from penetrating too deeply into the first slot 81, which may cause the traction wire 4 not to easily escape from the first slot 81 when the driving wheel 5 rotates counterclockwise.

As shown in fig. 3 and 4, the embodiment of the present invention further provides an operation portion 3 of an aperture mirror 1 based on the above-mentioned traction mechanism, which includes a housing 9, and the above-mentioned traction mechanism, wherein the driving wheel 5 is rotatably fixed to the housing 9, and the support frame 6 is fixed to the housing 9. By adopting the technical scheme, the appendicoscope 1 suitable for the intubation step in the ERAT treatment can be provided.

In this embodiment, the operation portion 3 of the aperture mirror 1 may further include a knob 10 provided outside the housing 9, and the driving wheel 5 is connected to the knob 10 and is driven by the knob 10 to rotate.

The embodiment of the invention also provides an appendicoscope 1 based on the traction mechanism, which comprises an insertion part 2 with a bending part 21, an operation part 3, a traction wire 4 connecting the operation part 3 and the bending part 21, and further comprises the traction mechanism and a traction wire 4 connecting a driving wheel 5 of the operation part 3 and the bending part 21, wherein the operation part 3 controls the bending of the bending part 21 by pulling or loosening the traction wire 4.

In the above description of the embodiments of the invention and in the drawings, only the traction mechanism of one side of the traction wire is shown to prevent redundancy. Those skilled in the art can understand that in reality, a corresponding traction mechanism can be correspondingly added on the basis of the embodiment provided by the application according to needs.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A traction mechanism for a telecentric mirror comprises a driving wheel for drawing a traction line, and is characterized by further comprising a supporting frame and a driving arm arranged on the driving wheel, wherein the driving arm is provided with a first slotted hole, the first slotted hole is provided with a first opening facing one side of the traction line, the first slotted hole allows a line body of the traction line to pass through and prevents a head of the traction line from passing through, the supporting frame is used for keeping the traction line at a preset position after the driving arm rotates along with the driving wheel to be separated from contact with the traction line, and when the traction line is at the preset position and the driving arm rotates along with the driving wheel to contact with the traction line, the first slotted hole supports the head of the traction line and draws the traction line.

2. The traction mechanism as recited in claim 1, wherein the support bracket has a second slot that allows passage of a wire body of the traction wire for maintaining the traction wire in a predetermined position after the drive arm rotates out of contact with the traction wire with the drive wheel.

3. The hitch mechanism of claim 2, wherein the second slot defines a second opening on a side facing the hitch wire.

4. The hitch mechanism of claim 3, wherein the second slot prevents a head of the hitch wire from passing therethrough.

5. The hitch mechanism of claim 1, wherein the first opening is flared in a top view having a maximum width less than a radial dimension of the head of the hitch wire.

6. The hitch mechanism of claim 5, wherein an outermost side of the cantilevered end of the first opening is tilted upward in a side view.

7. The hitch mechanism of claim 6, wherein the cantilevered end of the first opening is ramped from inside to outside to form a ramp section, and wherein the flare minimum width is located on the ramp section.

8. The traction mechanism as claimed in claim 7, wherein the distance between the side wall of the first slot facing the traction wire and the lowest point of the ramp section is equal to the wire body diameter of the traction wire.

9. An operating portion for an aperture mirror, comprising a housing, characterized by further comprising a traction mechanism according to any one of claims 1 to 8 and a knob disposed outside the housing, wherein the driving wheel is rotatably fixed to the housing, the driving wheel is connected to the knob and is driven by the knob to rotate, and the support frame is fixed to the housing.

10. An appendicoscope comprising an insertion part having a bending part, an operation part, and a traction wire connecting the operation part and the bending part, characterized by further comprising the operation part of claim 9 and a traction wire connecting the driving wheel of the operation part and the bending part.