CN111202550A

CN111202550A - Channel spreader and connecting mechanism thereof

Info

Publication number: CN111202550A
Application number: CN201811391833.XA
Authority: CN
Inventors: 郑召民; 王建儒; 刘辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-05-29

Abstract

The invention discloses a channel spreader and a connecting mechanism thereof, wherein the connecting mechanism comprises a first connecting piece, the first connecting piece is provided with a clamping groove and a spring plate structural body, one side of the spring plate structural body is provided with a first adjusting groove which penetrates through the inner side wall of the clamping groove, and the spring plate structural body is also provided with a through hole which penetrates through the two ends of the spring plate structural body; the second connecting piece is arranged on the first connecting piece and provided with a groove; the adjusting block is arranged in the groove and is provided with a matching groove which is matched with the groove to form a sliding groove hole; and the fastening assembly comprises a fastening piece and a locking nut, one end of the fastening piece is connected with the adjusting block, and the other end of the fastening piece penetrates through the through hole and is in threaded connection with the locking nut. The connecting mechanism can realize that the distraction distance is fixed at any distraction distance; the channel spreader adopts the connecting mechanism, so that a proper spreading distance can be obtained in the operation process, soft tissues can not be extruded, and postoperative recovery is facilitated.

Description

Channel spreader and connecting mechanism thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to a channel spreader and a connecting mechanism thereof.

Background

The fusion is a common operation mode for treating spinal diseases such as lumbar spinal stenosis and herniated disc, and in recent years, with the improvement of medical level, a minimally invasive technique is gradually applied to the fusion. The minimally invasive surgery can be completed by forming a small incision on the affected part, so that the minimally invasive surgery has the advantages of small injured tissue, benefit for recovery and healing and the like.

At present, the mode adopted by the fusion operation for opening the operation channel mainly comprises a multi-stage sleeve and a channel spreader, wherein the multi-stage sleeve can provide a view of 2-3cm, but dead angles can occur in the operation process, so that the operation is not facilitated; the channel spreader spreads soft tissues around the affected part to expose the affected part, and in the operation process, the traditional spreader is complex to operate and cannot stop at any spreading distance, so that the spreading distance is too small, and the operation visual field is not enough; and the too large opening distance can extrude the soft tissue, which is not favorable for postoperative recovery.

Disclosure of Invention

Based on this, there is a need for a channel spreader and a connection mechanism thereof, which can fix the spreading distance at any spreading distance; this passageway struts ware has adopted above-mentioned coupling mechanism for can obtain suitable distraction distance among the operation process, guarantee suitable operation field of vision, and can not extrude the soft tissue, be favorable to the postoperative to resume.

The technical scheme is as follows:

on one hand, the application provides a connecting mechanism, which comprises a first connecting piece, wherein the first connecting piece is provided with a clamping groove and a spring plate structure body, one side of the spring plate structure body is provided with a first adjusting groove which penetrates through the inner side wall of the clamping groove, the first adjusting groove is used for changing the size of a clamping opening of the clamping groove, and the spring plate structure body is also provided with a through hole which penetrates through two ends of the spring plate structure body; the second connecting piece is arranged on the first connecting piece and provided with a groove, and the central line of the groove and the central line of the clamping groove form an included angle; the adjusting block is arranged in the groove and is provided with a matching groove which is matched with the groove to form a sliding groove hole; and the fastening assembly comprises a fastening piece and a locking nut, one end of the fastening piece is connected with the adjusting block, and the other end of the fastening piece penetrates through the through hole and is in threaded connection with the locking nut and used for changing the closed size of the first adjusting groove.

When the connecting mechanism is used, the connecting mechanism can be slidably arranged on the mounting piece through the sliding groove hole, the spreading piece is arranged on the force application piece, and the force application piece is arranged on the first connection through the clamping groove; at this moment, when the spreading member needs to be moved, the fastening member only needs to be loosened, so that the force application member can move relative to the clamping groove, the force application member can be pulled or pushed, the locking fastening member can be utilized to close the first adjusting groove when the spreading member moves to the preset position, and then the clamping opening of the clamping groove is reduced, so that the force application member can be fastened on the first connecting member. The connecting mechanism is arranged, so that the opening piece can move on the mounting piece along with the second connecting piece, the force application piece is convenient to mount, and the force application piece is easy to control to move and fix at any time.

The technical solution is further explained below:

in one embodiment, the second link is rotatable relative to the adjustment block when the fastener is loosened; when the fastener locks, the second connecting piece is fixed on the mounting piece. Thus, when the fastener is loosened, the second connector can rotate relative to the mount, thereby enabling the spreader on the mount connection mechanism to also rotate relative to the mount.

In one embodiment, the inner side wall of the groove is in a cylindrical surface structure, and the outer side wall of the adjusting block is matched with the inner side wall of the groove, so that the second connecting piece can rotate relative to the adjusting block.

In one embodiment, the second connecting member is fixedly connected with the first connecting member, an arc-shaped groove is formed in the outer side wall of the adjusting block, and one end of the fastening member is clamped in the arc-shaped groove and can move along the track of the arc-shaped groove, so that the fastening member can drive the second connecting member to rotate.

In one embodiment, a connecting body is arranged at one end of the fastening piece, the connecting body is arranged in the groove, and the second connecting piece is provided with a connecting groove which is in limit fit with the connecting body, so that the second connecting piece is arranged on the first connecting piece.

In one embodiment, the inner side surface of the connecting body is matched with the outer side wall of the adjusting block, and the connecting body is provided with a clamping part matched with the arc-shaped groove.

In one embodiment, one side of the elastic sheet structural body is further provided with a second adjusting groove, and the second adjusting groove and the first adjusting groove are arranged at intervals along the axial direction of the through hole.

On the other hand, this application still provides a passageway struts ware, includes foretell coupling mechanism, coupling mechanism includes two, still includes: an annular mounting member to which the attachment mechanism is slidably mounted through the slide slot aperture; and the strutting assembly comprises a first force application part, a second force application part and a second force application part, wherein the first force application part, the second force application part and the second force application part are fixedly arranged on the first force application part, the first force application part is arranged on the corresponding one of the connecting mechanism in a clamping groove manner, the connecting mechanism can move relative to the corresponding one of the clamping groove manner, and the second force application part is arranged on the corresponding other of the connecting mechanism in a clamping groove manner, the connecting mechanism can move relative to the corresponding one of the clamping groove manner.

When the channel spreader is used, the connecting mechanism is slidably arranged on the mounting piece through the sliding groove hole, and the spreading assembly is arranged on the mounting piece through the connecting mechanism. Specifically, during surgery, when the first spreading member needs to be moved, the corresponding fastening member only needs to be loosened, so that the first force application member can move relative to the clamping groove, and the first force application member can be pulled or pushed, so that when the first spreading member moves to a preset position, the locking nut can be rotated to lock the fastening member, the first adjusting groove is closed, the clamping opening of the clamping groove is reduced, and the first force application member can be fastened on the first connecting member; in the same way, the second distraction piece can be moved at any time and fixed at any time, and an operator can conveniently obtain a proper distraction distance. This passageway struts ware has adopted above-mentioned coupling mechanism for can obtain suitable distraction distance among the operation process, guarantee suitable operation field of vision, and can not extrude the soft tissue, be favorable to the postoperative to resume.

The technical solution is further explained below:

in one embodiment, the first spreading piece is of a sheet structure, and the first spreading piece is provided with a plane body; the second props open the piece and is sheet structure, the second props open the piece and is equipped with the arc and dodges the portion, the arc dodges the portion and is close to the setting of second application of force piece, and with the plane body is relative. The first opening piece is of a sheet structure and is provided with a plane body, so that the psoas major can be pulled more conveniently, and the injury of nerves and blood vessels is avoided. Meanwhile, the second opening piece is also in a sheet structure and is used for retracting abdominal soft tissues; and through setting up the arc and dodging the portion, be favorable to obtaining bigger operation field of vision, reduce and strut the distance, further avoid extrudeing the soft tissue.

In one embodiment, the plane body is provided with a mounting groove for installing a fixing pin. Through setting up the mounting groove, can be directly be fixed in the backbone with the ware of strutting, solved traditional passageway and strut the ware and need rely on the drawback that snakelike arm is fixed for executing the operation perpendicularly, the operation field of vision does not have and shelters from, is favorable to the operation.

Drawings

FIG. 1 is a schematic structural diagram of a coupling mechanism in one embodiment;

FIG. 2 is an exploded view of the coupling mechanism shown in FIG. 1;

FIG. 3 is a schematic structural view of a channel spreader in another embodiment;

fig. 4 is a schematic structural view of the fixing assembly shown in fig. 3.

Description of reference numerals:

10. the connecting mechanism comprises a connecting mechanism 100, a first connecting piece, 110, a clamping groove, 120, a spring plate structure body, 122, a first adjusting groove, 124, a through hole, 126, a second adjusting groove, 200, a second connecting piece, 210, a groove, 220, a connecting groove, 230, a clamping body, 300, an adjusting block, 310, a matching groove, 320, an arc-shaped groove, 400, a fastening assembly, 410, a fastening piece, 412, a connecting body, 420, a lock nut, 20, a mounting piece, 30, a distraction assembly, 500, a first force application piece, 600, a first distraction piece, 610, a mounting groove, 620, a plane body, 700, a second force application piece, 800, a second distraction piece, 810, an arc-shaped avoidance part, 40, a fixing assembly, 41, a fixing piece, 42, a locking structure, 43 and a tooth-shaped part.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered to be "fixedly connected" to another element, the two elements may be fixed by way of detachable connection, or may be fixed by way of non-detachable connection, such as socket connection, snap connection, integrally formed fixation, welding, etc., which can be realized in the prior art, and thus are not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

References to "first" and "second" in this disclosure do not denote any particular order or quantity, but rather are used to distinguish one element from another.

As shown in fig. 1 and fig. 2, in the present embodiment, a connection mechanism 10 is provided, which includes a first connection member 100, the first connection member 100 is provided with a clamping groove 110 and a spring plate structure 120, one side of the spring plate structure 120 is provided with a first adjustment groove 122 penetrating through an inner side wall of the clamping groove 110, the first adjustment groove 122 is used for changing a size of a clamping opening of the clamping groove 110, and the spring plate structure 120 is further provided with a through hole 124 penetrating through two ends thereof; the second connecting piece 200, the second connecting piece 200 is installed on the first connecting piece 100, the second connecting piece 200 is provided with a groove 210, and the central line of the groove 210 forms an included angle with the central line of the clamping groove 110; the adjusting block 300, the adjusting block 300 is arranged in the groove 210, and the adjusting block 300 is provided with a matching groove 310 which is matched with the groove 210 to form a sliding groove hole (not marked); and a fastening assembly 400, wherein the fastening assembly 400 comprises a fastening member 410 and a locking nut 420, one end of the fastening member 410 is connected with the adjusting block 300, and the other end thereof passes through the through hole 124 and is in threaded connection with the locking nut 420 for changing the closing size of the first adjusting groove 122.

As shown in fig. 1 to 3, when the connecting mechanism 10 is used, the connecting mechanism 10 is slidably mounted on the mounting member 20 through the sliding slot hole, the supporting member (e.g., the first supporting member 600 or the second supporting member 800) is mounted on the force applying member (e.g., the first force applying member 500 or the second force applying member 700), and the force applying member is mounted on the first connection through the clip groove 110; at this time, when the spreader needs to be moved, only the fastening member 410 needs to be loosened, so that the force application member can move relative to the clamping groove 110, and thus the force application member can be pulled or pushed, so that when the spreader moves to the preset position, the locking fastening member 410 can be utilized to close the first adjusting groove 122, and further the clamping opening of the clamping groove 110 is reduced, so that the force application member can be fastened on the first connecting member 100. The connection mechanism 10 is configured such that the spreader can move on the mounting member 20 along with the second connection member 200, and the force applying member is easily mounted and controlled to move and be fixed at any time.

It should be noted that the included angle between the center line of the groove 210 and the center line of the clamping groove 110 can be designed according to actual requirements. Specifically, in the present embodiment, the included angle between the center line of the groove 210 and the center line of the clamping groove 110 is 90 °. The other end of the fastener 410 is provided with a screw that is adapted to the internal thread structure of the locking nut 420.

As shown in fig. 1 and 2, in addition to the above embodiments, in one embodiment, when the fastener 410 is loosened, the second connecting member 200 can rotate relative to the adjusting block 300; when the fastener 410 is locked, the second connector 200 is fixed to the mounting member 20. In this manner, when the fastener 410 is loosened, the second connector 200 can be rotated relative to the mounting member 20, thereby allowing the spreader on the attachment mechanism 10 of the mounting member 20 to also be rotated relative to the mounting member 20; at this time, the spreader has 3 degrees of freedom, and can freely slide (along the moving direction of the track of the mounting piece 20 and along the axial direction of the force application piece) and rotate (rotate around the mounting piece 20), so that the surgical field is opened to the optimal position, and the surgical operation is convenient.

Further, as shown in fig. 2, in an embodiment, the inner sidewall of the groove 210 is a cylindrical surface, and the outer sidewall of the adjusting block 300 is matched with the inner sidewall of the groove 210, so that the second connecting member 200 can rotate relative to the adjusting block 300. Thus, the adjustment block 300 is matched with the groove 210 of the second connecting piece 200 to form a rotating track of the second connecting piece 200, so that the angle adjustment of the spreading piece is more accurate.

As shown in fig. 1 and fig. 2, in an embodiment, the second connecting member 200 is fixedly connected to the first connecting member 100, an arc-shaped slot 320 is disposed on an outer side wall of the adjusting block 300, and one end of the fastening member 410 is clamped in the arc-shaped slot 320 and can move along a track of the arc-shaped slot 320, so that the fastening member 410 can drive the second connecting member 200 to rotate. In this way, the range of the rotation angle of the second connecting member 200 can be limited by the arc-shaped slots 320, so as to control the rotatable range of the spreader relative to the mounting member 20; and when the fastener 410 is locked, one end of the fastener 410 is press-fitted with the arc-shaped groove 320 so that the second connector 200 cannot rotate relative to the adjusting block 300.

As shown in fig. 2, on the basis of the above-mentioned embodiment, in an embodiment, one end of the fastening member 410 is provided with a connecting body 412, the connecting body 412 is disposed in the groove 210, and the second connecting member 200 is provided with a connecting groove 220 in a position-limited fit with the connecting body 412. In this way, the second connector 200 is mounted on the first connector 100 by the spacing fit of the connector 412 and the groove 210; when the fastening screw is rotated to fasten the lock, the fastener 410 can drive the connecting body 412 to press against the second connecting member 200, so as to reliably lock the second connecting member 200 on the first connecting member 100, and the position of the spreader will not move during the operation.

Further, in an embodiment, the inner side of the connecting body 412 is matched with the outer side wall of the adjusting block 300, and the connecting body 412 is provided with a clamping portion (not shown) matched with the arc-shaped groove 320. Thus, when the fastening screw is rotated to fasten the lock, the fastening member 410 drives the locking portion to engage with the sidewall of the arc-shaped slot 320, so that the second connecting member 200 is fixed to the adjusting block 300, and simultaneously the adjusting block 300 is pulled, so that the adjusting block 300 is fixed to the mounting member 20.

As shown in fig. 1 and fig. 2, in one embodiment, a second adjusting groove 126 is further disposed on one side of the elastic piece structure 120, and the second adjusting groove 126 and the first adjusting groove 122 are disposed at an interval along the axial direction of the through hole 124. By providing the second adjusting groove 126, the adjusting range of the size of the opening of the clamping groove 110 is wider, and the pre-tightening force is formed to make the locking nut 420 not easy to loosen.

As shown in fig. 2, on the basis of any of the above embodiments, in an embodiment, the second connecting member 200 is provided with two clamping bodies 230 disposed at two ports of the groove 210 at intervals, and the first connecting member 100 is provided with two clamping slots for snap-fitting with the two clamping bodies 230. Therefore, the second connector 200 can be detachably fixed to the first connector by the cooperation of the card body 230 and the card slot.

In another embodiment, as shown in fig. 3, there is provided an access distractor, which includes the above-mentioned connecting mechanism 10, and the connecting mechanism 10 includes two, and further includes: a ring-shaped mounting part 20, wherein the connecting mechanism 10 is slidably arranged on the mounting part 20 through a sliding slot hole; and the spreading assembly 30, the spreading assembly 30 includes a first force application member 500, a first spreading member 600 fixed on the first force application member 500, a second force application member 700, and a second spreading member 800 fixed on the second force application member 700, the first force application member 500 is disposed on a corresponding one of the connection mechanisms 10 through the clamping groove 110 and can move relative to the corresponding connection mechanism 10, and the second force application member 700 is disposed on another corresponding one of the connection mechanisms 10 through the clamping groove 110 and can move relative to the corresponding connection mechanism 10.

As shown in fig. 1 to 3, in use, the connecting mechanism 10 is slidably mounted on the mounting member 20 through the sliding slot hole, and the spreader assembly 30 is mounted on the mounting member 20 through the connecting mechanism 10. Specifically, during the operation, when the first spreader 600 needs to be moved, the corresponding fastener 410 is only required to be loosened, so that the first force application member 500 can move relative to the clip groove 110, and thus the first force application member 500 can be pulled or pushed, so that when the first spreader 600 moves to the preset position, the locking nut 420 can be rotated to lock the fastener 410, so that the first adjusting groove 122 is closed, and further the clipping opening of the clip groove 110 is reduced, and the first force application member 500 can be fastened on the first connector 100; in the same way, the second distraction piece 800 can be moved at any time and fixed at any time, so that the operator can obtain a proper distraction distance conveniently. This passageway struts ware has adopted above-mentioned coupling mechanism 10 for can obtain suitable distraction distance among the operation process, guarantee suitable operation field of vision, and can not extrude the soft tissue, be favorable to the postoperative to resume.

As shown in fig. 3, on the basis of the above embodiments, in an embodiment, the first spreading member 600 is a sheet-shaped structure, and the first spreading member is provided with a plane body 620; or/and the second spreader 800 is a sheet structure, and the second spreader 800 is provided with an arc avoiding portion 810, and the arc avoiding portion 810 is disposed close to the second force application member 700 and opposite to the plane body 620. The first spreader 600 is a sheet structure and is provided with a plane body 620, so that the psoas major can be pulled more conveniently, and the injuries of nerves and blood vessels can be avoided; meanwhile, the second spreader 800 is also in a sheet-like structure, and is used for retracting abdominal soft tissues; and through setting up arc and dodging portion 810, be favorable to obtaining bigger operation field of vision, reduce and strut the distance, further avoid extrudeing the soft tissue.

On the basis of the above embodiments, in an embodiment, the plane body 620 is provided with a mounting groove 610 for mounting a fixing pin. Through setting up mounting groove 610, can be directly be fixed in the backbone with the ware of strutting, solved traditional passageway and strut the ware and need rely on the drawback that snakelike arm is fixed for executing the operation perpendicularly, the operation field of vision does not have and shelters from, is favorable to the operation.

As shown in fig. 4, in addition to any of the above embodiments, the channel spreader further includes a fixing assembly 40 for fixing the mounting member 20 at a predetermined position. The mounting member 20 can be fixed to a fixed object such as an operating table, and the like through the fixing assembly 40.

Further, the fixing assembly 40 comprises a fixing member 41 movably mounted on the mounting member 20, and a locking structure 42 for locking or releasing the fixing member 41, the fixing member 41 being provided with a tooth 43 connected to the operating bed.

Specifically, a, when an operation is performed, a patient is placed on an operating table, the side face of the patient is upward, a target operation section is marked after perspective, and an operation incision (4-6cm transverse incision) is formed;

b. the operator uses the channel spreader to hold the force application member (the first force application member 500 or the second force application member 700), adjusts the spreading sheet to spread the ideal operation visual field, and then locks the fastener 410 to fix the spreading sheet and the mounting member 20;

c. the fixing pin is driven using the mounting groove 610 so that the first distraction piece is fixed relative to the spine of the patient. If the fixation is firm, the operation can be directly performed; if the fixing effect is not good, the mounting member 20 can be fixed to the operating table by the fixing assembly 40 and then the operation is performed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A coupling mechanism, comprising:

the elastic piece structure comprises a first connecting piece, a second connecting piece and a third connecting piece, wherein the first connecting piece is provided with a clamping groove and an elastic piece structure body, one side of the elastic piece structure body is provided with a first adjusting groove which penetrates through the inner side wall of the clamping groove, the first adjusting groove is used for changing the size of a clamping opening of the clamping groove, and the elastic piece structure body is also provided with a through hole which penetrates through two ends of the elastic piece structure body;

the second connecting piece is arranged on the first connecting piece and provided with a groove, and the central line of the groove and the central line of the clamping groove form an included angle;

the adjusting block is arranged in the groove and is provided with a matching groove which is matched with the groove to form a sliding groove hole; and

the fastening assembly comprises a fastening piece and a locking nut, one end of the fastening piece is connected with the adjusting block, and the other end of the fastening piece penetrates through the through hole and is in threaded connection with the locking nut and used for changing the closed size of the first adjusting groove.

2. The coupling mechanism of claim 1, wherein said second link is rotatable relative to said adjustment block when said fastener is loosened; when the fastener locks, the second connecting piece is fixed on the mounting piece.

3. The connecting mechanism according to claim 2, wherein the inner sidewall of the groove is cylindrical and the outer sidewall of the adjusting block is fitted with the inner sidewall of the groove, so that the second connecting member can rotate relative to the adjusting block.

4. The connecting mechanism according to claim 3, wherein the second connecting member is fixedly connected to the first connecting member, an arc-shaped groove is formed in an outer side wall of the adjusting block, and one end of the fastening member is clamped in the arc-shaped groove and can move along a track of the arc-shaped groove, so that the fastening member can drive the second connecting member to rotate.

5. The connecting mechanism according to claim 4, wherein one end of the fastening member is provided with a connecting body, the connecting body is disposed in the groove, and the second connecting member is provided with a connecting groove in limit fit with the connecting body.

6. The connecting mechanism according to claim 5, wherein the inner side surface of the connecting body is matched with the outer side wall of the adjusting block, and the connecting body is provided with a clamping part matched with the arc-shaped groove.

7. The connecting mechanism according to any one of claims 1 to 6, wherein a second adjusting groove is further formed on one side of the elastic piece structural body, and the second adjusting groove and the first adjusting groove are arranged at intervals along the axial direction of the through hole.

8. A channel distractor comprising the attachment mechanism of any one of claims 1 to 7, wherein the attachment mechanism comprises two, and further comprising:

an annular mounting member to which the attachment mechanism is slidably mounted through the slide slot aperture; and

strut the subassembly, strut the subassembly include first application of force spare, set firmly in first piece, the second application of force spare of strutting on the first application of force spare and set firmly in the second on the second application of force spare struts the piece, first application of force spare passes through press from both sides the groove and set up in one that corresponds coupling mechanism is last, and can be for corresponding coupling mechanism removes, the second application of force spare passes through press from both sides the groove and set up in another that corresponds coupling mechanism is last, and can be for corresponding coupling mechanism removes.

9. The channel distractor of claim 8, wherein the first distracting piece is a sheet-like structure, and the first distracting piece has a planar body; the second props open the piece and is sheet structure, the second props open the piece and is equipped with the arc and dodges the portion, the arc dodges the portion and is close to the setting of second application of force piece, and with the plane body is relative.

10. The channel spreader according to claim 9, wherein the planar body is provided with an installation slot for installing a fixing pin.