CN210019813U - Sliding type distractable intervertebral fusion cage and matched tool thereof - Google Patents

Abstract

The utility model discloses a slidingtype can strut interbody fusion cage and appurtenance thereof, a slidingtype can strut interbody fusion cage, including fusing the ware body and strutting the piece, fuse the ware body and include connecting portion and inflation portion, be equipped with the regulation hole that link up on the connecting portion, inflation portion is including the last clamp body and the lower clamp body that all is connected with connecting portion, is equipped with a plurality of from the locked groove on the regulation passageway, strutting the piece and sliding in adjusting the passageway and by last clamp body and lower clamp body locking at from the locked groove, strut the piece and be equipped with the screw in the piece, the screw is through adjusting passageway and regulation hole intercommunication. Because the utility model discloses a having set up the auto-lock groove on the integration ware body, under the condition that the external force that does not follow the screw direction was applyed, strutting the piece and getting into to be locked promptly after the auto-lock groove in the auto-lock groove, improve the problem that the piece slided back of strutting effectively to improve the problem that the intervertebral space easily sinks once more.

Description

Sliding type distractable intervertebral fusion cage and matched tool thereof

Technical Field

The utility model relates to the field of medical equipment, in particular to a sliding type intervertebral fusion cage capable of being propped open.

Background

With the change of living habits and working manners of human beings, spine-related diseases have become important diseases affecting the quality and level of life of people. When the disease is serious or the conservative treatment is ineffective, the clinician mostly adopts the mode of intervertebral fusion device bone grafting fusion after discectomy to carry out operative treatment, and obtains more ideal clinical curative effect.

However, with the continuous innovation of surgical techniques, the increasing use of tunneling or endoscopic surgery for spinal surgery related diseases, more and more clinicians and patients tend to treat the diseases by way of minimally invasive surgery. However, the minimally invasive surgery technology mostly adopts a mode of reducing the surgery operation space under the assistance of a channel or developing related surgery operations under the assistance of an endoscope, the limited channel diameter of the minimally invasive surgery technology brings less trauma to a patient, and simultaneously limits the application of the traditional intervertebral fusion cage in the surgery mode, so that partial intervertebral spaces of the patient cannot be completely expanded, and better intervertebral height support is provided for the patient. Therefore, the height-adjustable interbody fusion cage capable of being unfolded or expanded and the like is produced, the diameter of the interbody fusion cage is smaller before implantation, the interbody fusion cage can be implanted into the intervertebral space through a narrow space of a channel or an endoscope, and after implantation, the product can be unfolded or expanded in an in-vivo environment through various forms, and finally the aims of effectively restoring the intervertebral space and providing a good supporting effect are fulfilled.

But through carrying out the discovery after the product to prior art, current product design lacks effective anti-receding structure, easily leads to in the art or the postoperative intervertebral space to appear collapsing again and can't realize the problem of secondary bone grafting.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a slidingtype intervertebral fusion ware that can strut can improve and easily roll back the problem that leads to intervertebral space to sink once more.

Therefore, the utility model provides a sliding type intervertebral fusion cage capable of being opened.

In addition, in order to use a sliding type distractable intervertebral fusion device conveniently, the utility model discloses still provide a sliding type distractable intervertebral fusion device's kit.

According to the utility model discloses the slidingtype intervertebral fusion cage that can strut of first aspect embodiment, including fusing the ware body and strutting the piece, fuse the ware body and include connecting portion and inflation portion, be equipped with the regulation hole that link up on the connecting portion, inflation portion including all with last clamp body and lower clamp body that connecting portion are connected, go up the clamp body and be equipped with the regulation passageway down between the clamp body, go up and be equipped with the bone grafting window that link up on clamp body and/or the lower clamp body, the regulation hole with adjust the passageway intercommunication, be equipped with a plurality of self-locking groove on the regulation passageway, strutting the piece and be in slide and by last clamp body and lower clamp body locking in the self-locking groove in the regulation passageway, it is equipped with the screw in the piece to strut, the screw passes through adjust the passageway with adjust the hole intercommunication.

According to the utility model discloses the slidingtype intervertebral fusion ware that can strut has following beneficial effect at least for the embodiment of the first aspect: because the utility model discloses a have set up the auto-lock groove on the integration ware body, under the condition that the external force that does not follow the screw direction was applyed, strut the piece and get into the auto-lock groove after the locking promptly by the locking in the auto-lock groove, improve the problem that the piece that struts slided back effectively, strut the piece and slide in adjusting the passageway and to realize the height-adjustable who fuses the ware body, thereby improve the easy problem that sinks once more in intervertebral space, be favorable to fusing the ware body and realize the secondary bone grafting, and simultaneously, the design of the big bone grafting window of fusing the ware body, be favorable to implanting more sclerotin, promote the healing.

The utility model discloses in the auto-lock mentioned, refer to and exert under the circumstances of less external force along the screw direction to the piece of strutting, the piece of strutting keeps in the auto-lock inslot under last clamp body and the combined action of lower clamp body. For example, the sliding distractible intervertebral cage is subjected to forces from the superior endplate and the inferior endplate during normal operation, and the distraction block can be retained in the self-locking groove when a component force in the direction of the screw hole is applied to the distraction block.

According to some embodiments of the first aspect of the present invention, the self-locking groove is provided at an upper side of the lower clamping body and/or at a lower side of the upper clamping body.

According to some embodiments of the first aspect of the present invention, the bottom surface of the self-locking groove is an arc-shaped curved surface. By utilizing the arc-shaped curved surface, the distraction block is easy to separate from the self-locking groove under the condition of applying external force, and the distraction block is easy to slide to other self-locking grooves along the adjusting channel so as to adjust the distraction degree of the fusion cage body.

According to the utility model discloses some embodiments of the first aspect, all be equipped with on two sides that last clamp body, lower clamp body kept away from each other and prevent moving back the tooth. The anti-falling teeth are arranged, so that the fusion cage body is not easy to slip and dislocate when being placed between the intervertebral and the bony end plates of the upper vertebral body and the lower vertebral body.

According to the utility model discloses the accessory tool of intervertebral fusion ware can be strutted to slidingtype of second aspect embodiment, include the utility model discloses the first aspect embodiment a slidingtype intervertebral fusion ware can be strutted, be equipped with a plurality of draw-in groove on the inner wall of regulation hole, accessory tool still includes:

the middle of the supporting piece is provided with a penetrating insertion rod hole, a first internal thread is arranged in the insertion rod hole, the outer side of the tail end of the insertion rod hole is provided with a clamping block, and the clamping block is clamped with the clamping groove;

the opening part comprises a first opening extending part matched with the inserted rod hole, a first external thread matched with the first internal thread is arranged in the first opening extending part, a push column is arranged at the tail end of the opening part, and the outer diameter of the push column is smaller than the inner diameter of the screw hole;

the backspacing piece comprises a backspacing abutting part and a first backspacing extending part matched with the inserted rod hole, and the tail end of the first backspacing extending part is provided with a second external thread matched with the screw hole;

the first stretching-in part or the first retracting-in part stretches into the inserting rod hole.

Under the initial condition, prop open the piece and be located the volume that makes the fusion cage body and be in the self-locking groove under the less state to the fusion cage body can reach intervertebral target position, after the fusion cage body reached target position, make the piece that props open slide the degree of strutting that adjusts the fusion cage body through propping open or returning back and provide good support with the space of adaptation target position.

When the fusion cage body needs to be propped open, the first propping extending part of the propping member extends into the inserting rod hole, the pushing column at the tail end of the first propping extending part extends into the screw hole, the first internal thread is connected with the first external thread in a matching way, and the rotating propping member applies external force to the propping block through the pushing column to enable the pushing block to break away from the self-locking and push the pushing block to other self-locking grooves so as to prop open the fusion cage body.

When the distraction degree of the fusion cage body needs to be reduced, the distraction piece is replaced by the retraction piece, the first retraction extension part extends into the inserting rod hole, the second external thread is connected with the screw hole in a matching way, and the retraction abutting part is abutted against the end face of the inserting rod hole. The rotating backspacing rod drives the opening block to move through the second external thread, so that the opening block is separated from the self-locking and is pulled back to other self-locking grooves, and the opening degree of the fusion device body is reduced.

According to the utility model discloses the supporting instrument of intervertebral fusion ware can be strutted to slidingtype of second aspect embodiment has following beneficial effect at least: the supporting tool can realize the pulling back or pushing in of the strutting piece by rotating the retracting piece or the strutting piece, and has simple structure and simple and convenient operation.

According to some embodiments of the second aspect of the present invention, a cantilever is disposed at a terminal of the insertion rod hole, the fixture block is disposed on the cantilever, an outer wall surface of the cantilever is an inclined surface, and the outer wall surface of the cantilever is inclined to an outer side of the insertion rod hole in a process of extending from one end close to the insertion rod hole to the other end; the support piece still overlaps outward and is equipped with the unlocking sleeve, unlocking sleeve's internal diameter is less than the biggest external diameter of cantilever outer wall, unlocking sleeve follows support piece's axis direction slides. Above setting, when the unlocking sleeve slides to cantilever one side, can make the cantilever inwards shrink through the outer wall of cantilever to drive the fixture block inwards and remove, be convenient for make the fixture block on the cantilever break away from with the draw-in groove.

According to the utility model discloses some embodiments of the second aspect, still be equipped with the unblock internal thread on support piece's the outer wall, correspondingly, the telescopic inboard of unblock is equipped with the unblock external screw thread, the unblock external screw thread with unblock internal thread accordant connection. Therefore, the unlocking sleeve can be slid to one end of the cantilever by rotating the unlocking sleeve, the sliding acting force of the unlocking sleeve can be increased by means of the threaded connection structure of the unlocking sleeve and the supporting piece, and the cantilever is convenient to overcome the elastic force to drive the clamping block to move inwards.

According to the utility model discloses some embodiments of the second aspect, the inserted bar hole is the shoulder hole, the inserted bar hole includes macropore and aperture, the aperture is close to the end of inserted bar hole, first internal thread is established in the macropore, first strut stretch into portion and first back stretch into portion with the aperture phase-match, the one end that first strut stretch into portion is connected with the second and struts stretch into the portion, first external screw thread is established the second struts and stretches into in the portion. Above setting, when support piece stretched into the inserted bar hole, the first portion of stretching into of strutting in the insertion process can directly stretch into the aperture, only need make the post of pushing away to the removal of piece one side of strutting through the swivelling support pole when the second struts the first female connection who stretches into portion and set up on the macropore, and it is more convenient to insert support piece.

According to some embodiments of the second aspect of the present invention, the support member is further provided with a handle. Thereby facilitating gripping the support.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a first schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram ii of an embodiment of the first aspect of the present invention;

fig. 3 is a perspective view of the spreading block according to the embodiment of the present invention;

fig. 4 is a schematic structural view of the cage body according to the second aspect of the present invention when it is spread;

fig. 5 is a schematic structural view of the fusion cage according to the second aspect of the present invention when the fusion cage body is reduced.

In the drawings:

100-a cage body; 110-an upper clamping body; 120-a lower clamp body; 130-self-locking groove; 140-a conditioning aperture; 141-card slot; 150-a modulation channel; 160-bone window implantation; 170-anti-back teeth;

200-a spreader block; 210-screw holes;

310-a cantilever; 311-a fixture block;

410-a first distraction extension; 411-a push column; 412-a second distraction extension;

510-first retraction entrance; 520-a retracting abutment;

600-unlocking the sleeve.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of terms means an indefinite amount, and a plurality of terms means two or more, and the terms greater than, less than, exceeding, etc. are understood to include no essential numbers, and the terms greater than, less than, within, etc. are understood to include essential numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, if there is a phrase containing a plurality of parallel features, the phrase defined therein is the closest feature, for example: b, C disposed on A, E connected to D, which indicates that B is disposed on A and E is connected to D, and C is not limited; however, terms indicating relationships between features such as "spaced apart", "arranged in a ring", etc. do not fall within this category. The phrase preceded by the word "mean" indicates that it is a definition of all features in the phrase, and if B, C, D is set on a, it indicates that B, C and D are set on a.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1-3, the utility model discloses a slidingtype intervertebral fusion cage that can strut of first aspect embodiment, including fusion cage body 100 with strut piece 200, fusion cage body 100 includes connecting portion and inflation portion, be equipped with the regulation hole 140 that link up on the connecting portion, inflation portion includes all last clamp 110 and lower clamp 120 who is connected with connecting portion, it is equipped with regulation passageway 150 to go up between clamp 110 and the lower clamp 120, it all is equipped with the bone grafting window 160 that link up on clamp 110 and the lower clamp 120 to go up, regulation hole 140 communicates with regulation passageway 150, be equipped with a plurality of self-locking groove 130 on the regulation passageway 150, strut piece 200 and slide and be locked in self-locking groove 130 by last clamp 110 and lower clamp 120 in regulation passageway 150, strut and be equipped with screw 210 in the piece 200, screw 210 communicates with regulation hole 140 through adjusting passageway 150. The screw hole 210 is provided in the distraction block 200, which is advantageous to reduce the volume of the distraction block 200, reduce the occupied space of the space, increase the space inside the bone grafting window 160, implant more bone fragments, accelerate healing, and particularly facilitate the implantation of autologous bone fragments with larger volume.

Because the utility model discloses a fuse and set up self-locking groove 130 on the ware body 100, under the condition that does not have external force to apply, strut the piece 200 and get into the self-locking groove 130 after the locking promptly in self-locking groove 130, improve the problem that the piece 200 slided back of strutting effectively to improve the problem that the intervertebral space easily sinks once more.

Specifically, the self-locking groove 130 is opened at an upper side of the lower clamp body 120 and a lower side of the upper clamp body 110, forming two self-locking positions. The number of the self-locking bits may be two or more.

The bottom surface of the self-locking groove 130 is an arc-shaped curved surface. By using the arc-shaped curved surface, the distraction block 200 is easily separated from the self-locking groove 130 under the condition of applying an external force, and slides to other self-locking grooves 130 along the adjustment channel 150 so as to adjust the distraction degree of the fusion cage body 100.

The upper clamping body 110 and the lower clamping body 120 are provided with anti-falling teeth 170 on two sides away from each other.

Referring to fig. 5, the utility model discloses the supporting tool of intervertebral fusion ware can be strutted to slidingtype of second aspect embodiment, the intervertebral fusion ware can be strutted to a slidingtype that it includes, is equipped with a plurality of draw-in groove 141 on the inner wall of regulation hole 140, and the supporting tool still includes:

a penetrating insertion rod hole is formed in the middle of the supporting piece, first internal threads are formed in the insertion rod hole, a clamping block 311 is arranged on the outer side of the tail end of the insertion rod hole, and the clamping block 311 is clamped with the clamping groove 141;

the opening part comprises a first opening extending part 410 matched with the inserted link hole, a first external thread matched with the first internal thread is arranged in the middle of the first opening extending part 410, a push column 411 is arranged at the tail end of the opening part, and the outer diameter of the push column 411 is smaller than the inner diameter of the screw hole 210;

the backspacing piece comprises a backspacing abutting part 520 and a first backspacing extending part 510 matched with the inserted rod hole, and the tail end of the first backspacing extending part 510 is provided with a second external thread matched with the screw hole 210;

the first distraction extension portion 410 or the first retraction extension portion 510 extends into the rod-insertion hole.

Specifically, the inserted bar hole is the shoulder hole, and the inserted bar hole includes macropore and aperture, and the aperture is close to the end in inserted bar hole, and first internal thread is established in the macropore, and first the portion 410 that stretches into that struts and first back stretch into portion 510 and aperture phase-match, and the one end that the portion 410 was stretched into to first strut is connected with the second and struts the portion 412 that stretches into, and first external screw thread is established and is strutted on the portion 412 in the second.

It will be appreciated that the crushed bone to be implanted is implanted into the bone grafting window 160 of the fusion cage body 100 through the rod insertion hole of the support member, and the head end of the rod insertion hole has a funnel-shaped structure in order to facilitate the implantation of the crushed bone.

The tail end of the small hole is provided with a cantilever 310, the fixture block 311 is arranged on the cantilever 310, the outer wall surface of the cantilever 310 is an inclined surface, and the outer wall surface of the cantilever 310 is inclined to the outer side of the plunger hole in the process of extending from the head end to the tail end of the plunger hole; the support piece is also sleeved with an unlocking sleeve 600, the inner diameter of the unlocking sleeve 600 is smaller than the maximum outer diameter of the outer wall surface of the cantilever 310, and the unlocking sleeve 600 slides along the axial direction of the support piece. With the above arrangement, when the unlocking sleeve 600 slides towards the cantilever 310, the cantilever 310 can be retracted inwards by the outer wall surface of the cantilever 310, so as to drive the latch 311 to move inwards, thereby facilitating the disengagement of the latch 311 on the supporting member from the latch groove 141.

An unlocking internal thread is further arranged on the outer wall of the supporting piece, correspondingly, an unlocking external thread is arranged on the inner side of the unlocking sleeve 600, and the unlocking external thread is connected with the unlocking internal thread in a matched mode, so that the clamping block 311 is separated from the clamping groove 141 through rotating the unlocking sleeve 600.

In the present embodiment, the cage body 100 is expanded when the expanding block 200 slides rightward, and in other embodiments, the cage body 100 may be contracted when the expanding block 200 slides rightward. In an initial state, the distraction block 200 is located in the self-locking groove 130 which enables the volume of the fusion cage body 100 to be in a smaller state, namely, in the self-locking groove 130 on the left side, so that the fusion cage body 100 can reach an intervertebral target position, and after the fusion cage body 100 reaches the target position, the distraction block 200 slides to the right through a distraction piece or a retraction piece to adjust the distraction degree of the fusion cage body 100 so as to adapt to the space of the target position.

Referring to fig. 4, when the fusion cage body 100 needs to be expanded, the first expanding portion 410 of the expanding member extends into the rod hole, the pushing post 411 at the end of the first expanding portion 410 extends into the screw hole 210, the first internal thread is connected with the first external thread in a matching manner, and the rotating expanding member applies external force to the expanding block 200 through the pushing post 411 to enable the expanding block to be separated from self-locking and slide rightwards to push the self-locking groove 130 at the right side so as to expand the fusion cage body 100.

Referring to fig. 5, when the distraction degree of the fusion cage body 100 needs to be reduced, the distraction piece is replaced by a retraction piece, the first retraction extension portion 510 extends into the insertion rod hole, the second external thread is connected with the screw hole 210 in a matching manner, and the retraction abutting portion 520 abuts against the end face of the insertion rod hole. The backspacing rod is rotated to drive the opening block 200 to move through the second external thread, so that the opening block 200 is separated from the self-locking and is pulled back to the left self-locking groove 130 leftwards, and the opening degree of the fusion cage body 100 is reduced.

This kit is through rotatory piece or the piece that struts of rolling back, during the use, at first is connected support piece through fixture block 311 and draw-in groove 141 on the fusion cage body 100, and the rotation that sets up in the inserted bar hole is rolled back the piece or is strutted the piece and can realize fusing cage body 100 height-adjustable, simple structure, and is easy and simple to handle.

In addition, it should be noted that the utility model discloses a cooperation between fusion cage and the supporting instrument can realize abundant secondary bone grafting. The internal back of patient has been implanted at the integration ware body 100 promptly, strut the integration ware through this supporting use tools in vivo, the inside part of integration ware can be reserved and bone space can be planted, simultaneously strut the piece at supporting tools and withdraw from integration ware body 100 inside back completely, another part bone space can be planted also to be reserved, the funnel shaped structure in garrulous bone accessible bayonet socket is implanted inside integration ware body 100, in order to fill the space that forms after the integration ware body 100 struts the back volume increase and withdraws from the piece of strutting, realize abundant secondary bone grafting. Specifically, referring to fig. 4, bone, broken bone, etc. can enter the rod-inserting hole through the funnel-shaped structure of the support member, thereby entering the bone-grafting window of the fusion cage body 100 to complete the secondary bone grafting.

While the preferred embodiments of the present invention have been described in detail, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. The utility model provides a slidingtype can strut interbody fusion cage, includes fusion cage body (100) and struts piece (200), fusion cage body (100) includes connecting portion and inflation portion, be equipped with regulation hole (140) that link up on the connecting portion, inflation portion including all with last clamp body (110) and lower clamp body (120) that connecting portion are connected, go up and press from both sides between clamp body (110) and lower clamp body (120) and be equipped with regulation passageway (150), go up and press from both sides the clamp body (110) and/or be equipped with bone grafting window (160) that link up down on clamp body (120), adjust hole (140) with adjust passageway (150) intercommunication, its characterized in that: the adjusting channel (150) is provided with a plurality of self-locking grooves (130), the spreading block (200) slides in the adjusting channel (150) and is locked in the self-locking grooves (130) by the upper clamping body (110) and the lower clamping body (120), a screw hole (210) is arranged in the spreading block (200), and the screw hole (210) is communicated with the adjusting hole (140) through the adjusting channel (150).

2. The sliding distractible intervertebral cage of claim 1, wherein: the self-locking groove (130) is arranged on the upper side of the lower clamping body (120).

3. The sliding type expandable intervertebral cage according to claim 1 or 2, wherein: the self-locking groove (130) is arranged at the lower side of the upper clamping body (110).

4. The sliding distractible intervertebral cage of claim 1, wherein: the bottom surface of the self-locking groove (130) is an arc-shaped curved surface.

5. The sliding distractible intervertebral cage of claim 1, wherein: the two sides of the upper clamping body (110) and the lower clamping body (120) which are far away from each other are respectively provided with anti-falling teeth (170).

6. The utility model provides a supporting instrument of slidingtype can strut interbody fusion cage which characterized in that: the sliding type expandable intervertebral fusion cage as claimed in any one of claims 1, 2, 4 and 5, wherein a plurality of clamping grooves (141) are arranged on the inner wall of the adjusting hole (140), and the kit further comprises:

the middle of the supporting piece is provided with a penetrating insertion rod hole, a first internal thread is arranged in the insertion rod hole, the outer side of the tail end of the insertion rod hole is provided with a clamping block (311), and the clamping block (311) is clamped with the clamping groove (141);

the opening piece comprises a first opening extending part (410) matched with the inserted link hole, a first external thread matched with the first internal thread is arranged in the middle of the first opening extending part (410), a push column (411) is arranged at the tail end of the opening piece, and the outer diameter of the push column (411) is smaller than the inner diameter of the screw hole (210);

the backspacing piece comprises a backspacing abutting part (520) and a first backspacing part (510) matched with the inserted rod hole, the tail end of the first backspacing part (510) is provided with a second external thread matched with the screw hole (210),

the first stretching-out part (410) or the first retracting-in part (510) stretches into the inserting rod hole.

7. The kit of claim 6, wherein the kit comprises: a cantilever (310) is arranged at the tail end of the plug rod hole, the fixture block (311) is arranged on the cantilever (310), the outer wall surface of the cantilever (310) is an inclined surface, and the outer wall surface of the cantilever (310) is inclined to the outer side of the plug rod hole in the process of extending from one end close to the plug rod hole to the other end; the support piece still overlaps outward and is equipped with unlocking sleeve (600), the internal diameter of unlocking sleeve (600) is less than the biggest external diameter of cantilever (310) outer wall, unlocking sleeve (600) are followed support piece's axis direction slides.

8. The kit of claim 7, wherein the kit comprises: still be equipped with the unblock internal thread on support piece's the outer wall, correspondingly, the inboard of unblock sleeve (600) is equipped with the unblock external screw thread, the unblock external screw thread with unblock internal thread accordant connection.

9. The kit of claim 6, wherein the kit comprises: the inserted bar hole is the shoulder hole, the inserted bar hole includes macropore and aperture, the aperture is close to the end in inserted bar hole, first internal thread is established in the macropore, first strut stretch into portion (410) and first retreat stretch into portion (510) with the aperture phase-match, first strut the one end of stretching into portion (410) be connected with the second strut stretch into portion (412), first external screw thread is established the second strut stretch into on portion (412).

10. The kit of claim 6, wherein the kit comprises: the support piece is also provided with a handle.

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