TWI740239B - Multi-section expandable device - Google Patents

Abstract

A multi-section expandable device comprises an expansion module (10), a first push member (20) and a second push member (30) disposed at front and rear ends of the expansion module (10), and a bolt (40) screwedly connected to the first and second push members (20, 30). When the bolt (40) is tightened, the first push member (20) and the second push member (30) are pushed to approach each other so as to push the expansion module (10) to generate a first-stage expansion and a second-stage expansion. The first-stage expansion enables the expansion module (10) to expand laterally so as to adjust its width. The second-stage expansion is performed after the expansion module (10) is laterally expanded to have a maximum width, so that the expansion module (10) is longitudinally expanded to adjust its height. Therefore, no matter how much distance is required between the upper and lower vertebrae, the expansion module (10) can be expanded laterally to have a larger width. The multi-section expandable device not only has better support effect, but also avoids the wear of the contact surfaces of the vertebrae.

Description

Multi-stage stretching device

The present invention relates to the technical field of the structure of an extensional implant, in particular, it can have a larger width regardless of the distance between the upper and lower condyles, so that it has better support. The effect and the multi-segment expansion device that can prevent the condyle contact surface from being easily damaged by abrasion.

At present, the minimally invasive operation of intervertebral fusion surgery is mainly to establish a small channel in the affected area, and then use endoscopy or X-ray assistance to send a small-volume intervertebral fusion cage from the small channel to the upper and lower condyles of the affected area. Then, the intervertebral fusion cage is extended longitudinally to support the opposite end surfaces of the upper and lower spine joints to achieve the purpose of clinical intervertebral fusion.

A conventional intervertebral fusion cage, as shown in U.S. Patent Nos. US9,883,955 B2 and US10,045,858 B2, can only be stretched in one direction. When it is longitudinally implanted between the upper and lower vertebral condyles, it is tied It can be stretched longitudinally to support between the upper and lower condyles of the spine. At this time, since the contact area with the upper and lower condyles is very small, it is easy to cause the end faces of the upper and lower condyles to be worn out and form a depression. situation. When it is implanted laterally between the upper and lower vertebral condyles, although it can expand and expand the width laterally to increase the contact area and improve the problem of the condyle being worn and dented, its height is fixed and cannot be adjusted. When the distance between the condyles of the lower vertebrae is large, it cannot resist the opposite end surfaces of the condyles of the upper and lower vertebrae, and the purpose of intervertebral fusion is lost.

Another conventional intervertebral fusion cage, such as US 8,864,833 B2 As shown in the US10,098,758 B2 patent, although it can be stretched both longitudinally and laterally at the same time, the height of the relative longitudinal stretch of the intervertebral fusion cage is also required for each person's body shape, disease severity, and diseased part. It will be different. Therefore, when it is implanted between the lower vertebral condyles at a greater height that needs to be stretched longitudinally, it can be stretched both longitudinally and laterally to be larger at the same time. The problem of depression caused by wear. However, when it is implanted at a small height that requires longitudinal extension, between the lower vertebral condyles, its venomous extension distance will be limited and can only be very small or not, and the lateral extension distance is due to the relationship between the longitudinal extension and the longitudinal extension. The extension distance is simultaneously linked, so the relative lateral extension distance will be relatively small or no, and at this time, there will still be insufficient width, which causes the problem that the end surface of the condyle is easily worn by it and forms a depression, which is in vain. Moreover, the simultaneous longitudinal extension and lateral extension will relatively cause greater operating resistance, so there are also problems such as poor smoothness and labor.

The present invention provides a multi-stage stretching device, which includes a stretching module, a first pushing member, a second pushing member and a bolt. Among them, the stretching module can produce longitudinal stretching and lateral stretching. The first pushing member is arranged at the front end of the stretching module and has a screw hole inside. The second pushing member is arranged at the rear end of the stretching module and has a through hole inside. The bolt has a screw portion and a head with a larger outer diameter. The screw portion passes through the through hole of the second pushing member and is screwed in the screw hole of the first pushing member, and the head abuts against the first pushing member. The two push members are opposite to one side of the first push member. Tightening the bolt makes the first push member and the second push member relatively close to push the stretch module to produce a first stretch and a second stretch Stretching, the first stretch is to stretch the stretch module horizontally, and the second stretch is performed after the first stretch reaches the maximum width, and the longitudinal stretch height of the stretch module can be adjusted.

In the multi-stage stretching device provided by the present invention, the first The second stage of stretching is performed after the horizontal stretching to the maximum width, and then the second stretching is performed to adjust the height. Therefore, no matter how high it needs to be stretched longitudinally between the upper and lower spine joints, it can be stretched to the maximum width. And it has a larger contact area, which not only has better supporting effect and can avoid the condyle contact surface from being easily worn and dented, so its single specification is very suitable for different body types, different conditions and different diseased parts. superior. Moreover, the two-stage extension can also greatly reduce the operating resistance, which can increase the smoothness and save effort.

10: Stretching module

11: The first stretch block

110: first slope

111: The first inclined guide rail

112: The first guide block

113: The first guide groove

12‧‧‧Second stretch block

120‧‧‧Second Incline

121‧‧‧Second inclined rail

122‧‧‧Second guide groove

123‧‧‧Second guide block

13‧‧‧Third stretch block

130‧‧‧third slope

131‧‧‧The third inclined rail

132‧‧‧Third guide block

133‧‧‧Third guide groove

14‧‧‧Fourth stretch block

140‧‧‧Fourth Incline

141‧‧‧The fourth inclined rail

142‧‧‧Fourth guide groove

143‧‧‧Fourth guide block

15‧‧‧First guide block

150‧‧‧First upper slope

151‧‧‧First lower slope

152‧‧‧The first upper dovetail slot

153‧‧‧The first dovetail slot

154‧‧‧First front slope

155‧‧‧The first front dovetail slot

156‧‧‧First front stop

16‧‧‧Second guide block

160‧‧‧Second upper slope

161‧‧‧Second Lower Slope

162‧‧‧Second upper dovetail slot

163‧‧‧Second lower dovetail slot

164‧‧‧Second rear slope

165‧‧‧Second back dovetail slot

166‧‧‧Second rear stop

17‧‧‧Third guide block

170‧‧‧The third upper slope

171‧‧‧The third lower slope

172‧‧‧The third upper dovetail slot

173‧‧‧The third lower dovetail slot

174‧‧‧The third front slope

175‧‧‧The third front dovetail slot

176‧‧‧The third front stop

18‧‧‧Fourth guide block

180‧‧‧The fourth upper slope

181‧‧‧Fourth lower slope

182‧‧‧The fourth upper dovetail slot

183‧‧‧The fourth lower dovetail slot

184‧‧‧Fourth rear slope

185‧‧‧The fourth rear dovetail slot

186‧‧‧Fourth rear stop

20‧‧‧First push

21‧‧‧Set of rods

22‧‧‧Screw hole

23‧‧‧The first push piece slope

24‧‧‧The first push piece guide rail

25‧‧‧First stop surface

30‧‧‧Second Push Piece

31‧‧‧Perforation

32‧‧‧Second push piece slope

33‧‧‧Second push piece guide rail

34‧‧‧Second stop surface

40‧‧‧Bolt

41‧‧‧Screw part

42‧‧‧Head

50‧‧‧Upper Condyle

51‧‧‧Lower Condyle

60‧‧‧Limit guide groove

61‧‧‧Limit stop surface

62‧‧‧Protrusion

70‧‧‧Limiting guide groove

71‧‧‧Stop Noodles

72‧‧‧Card Department

80‧‧‧Guiding structure

81‧‧‧Guide hole

810‧‧‧Flange

82‧‧‧Guide

820‧‧‧Guide rod

821‧‧‧Connecting rod

822‧‧‧Expansion head

a‧‧‧Front block

a1‧‧‧Miter Surface

a2‧‧‧Guide

b‧‧‧After block

b1‧‧‧Miter Surface

b2‧‧‧Dovetail slot

Figure 1 is a three-dimensional exploded schematic view of the first embodiment of the present invention.

Figure 2 is a perspective exploded schematic view of the other side of the first embodiment of the present invention.

Figure 3 is an enlarged schematic view of the three-dimensional assembly of the first embodiment of the present invention.

Figure 4 is a top view of Figure 3.

Figure 5 is a front view of Figure 3.

Figure 6 is the right side view of Figure 3.

Fig. 7 is a schematic cross-sectional view of A-A in Fig. 5.

Fig. 8 is a schematic cross-sectional view of B-B in Fig. 5.

Figure 9 is a schematic diagram of the three-dimensional action of the first embodiment of the present invention when the first segment is stretched.

Fig. 10 is a schematic diagram of the implementation state of the first embodiment of the present invention when the first segment is stretched.

Figure 11 is an enlarged schematic view of the C-C section of Figure 10.

Figure 12 is a schematic diagram of the three-dimensional action of the first embodiment of the present invention when the second segment is stretched.

Figure 13 is a schematic diagram of the front view of the implementation state of the first embodiment of the present invention when the second section is stretched.

Figure 14 is an enlarged schematic view of the D-D section of Figure 13.

Figure 15 is a three-dimensional exploded schematic view of the second embodiment of the present invention.

Figure 16 is a perspective exploded schematic view of the other side of the second embodiment of the present invention.

Figure 17 is a perspective enlarged schematic view of the second embodiment of the present invention in a fully contracted state.

Figure 18 is a three-dimensional enlarged schematic diagram of the second embodiment of the present invention when the first section is stretched to the limit.

Figure 19 is a perspective enlarged schematic view of the second embodiment of the present invention in a fully extended state.

Figure 20 is a schematic cross-sectional view of the second embodiment of the present invention when the first section is stretched to the limit.

Figure 21 is a schematic diagram of the action of the limiting structure of the second embodiment of the present invention.

Figure 22 is a schematic diagram of the action of the guiding structure of the second embodiment of the present invention.

Figure 23 is a three-dimensional exploded schematic view of the third embodiment of the present invention.

Figure 24 is a partial three-dimensional exploded enlarged schematic view of the fourth embodiment of the present invention.

Figure 25 is a three-dimensional enlarged schematic view of the fourth embodiment of the present invention in a two-stage longitudinal extension state.

Figure 26 is a schematic diagram of the implementation state of the fourth embodiment of the present invention in two longitudinal stretches.

Figure 27 is a schematic diagram of the present invention applied to bones.

Figures 1-14 of the present invention are the first embodiment of the two-segment expansion intervertebral fusion cage of the present invention.

Please refer to Figures 1-8, which show that the multi-stage stretching device according to the present invention includes a stretching module 10, a first pushing member 20, a second pushing member 30 and a bolt 40, in which:

The stretching module 10 can produce longitudinal stretching and lateral stretching;

The first pushing member 20 is arranged at the front end of the stretching module 10, and a set of rods 21 protrude from the rear side of the first pushing member 20, and the set of rods 21 has a screw hole 22 inside;

The second pushing member 30 is arranged at the rear end of the stretching module 10 and has a through hole 31 therein;

The bolt 40 has a screw portion 41 and a head 42 with a larger outer diameter. The screw portion 41 passes through the through hole 31 of the second push member 30 and is screwed into the screw hole 22 of the first push member 20. In this case, the head 42 abuts against a side of the second pushing member 30 opposite to the first pushing member 20.

Please refer to Figures 3, 9, and 12, by locking the bolt 40, the first pushing member 20 and the second pushing member 30 can be relatively close to push the stretching module 10 to produce a first section Stretching and a second stretch, the first stretch is to stretch the stretch module 10 laterally, and the second stretch is performed after the first stretch to the maximum width. The stretch die can be adjusted as needed Vertical extension height of group 10.

The stretch module 10 includes a first stretch block 11, a second stretch block 12, a third stretch block 13, a fourth stretch block 14, a first guide block 15, a second guide block 16, a The third guide block 17 and the fourth guide block 18, in which:

The first extension block 11 is formed with a plurality of convex teeth on the top surface. The front and rear ends respectively form two first inclined surfaces 110 inclined from the bottom to the top to the outside. The two first inclined surfaces 110 are respectively provided with two first inclined guide rails 111. The bottom surface has a plurality of first guide blocks 112 and a plurality of first guide grooves 113 arranged in a mutually staggered and trapezoidal shape.

The second extension block 12 is located on the lower side of the first extension block 11. The bottom surface forms a plurality of convex teeth. The front and rear ends respectively form two second inclined surfaces 120 inclined from top to bottom. Two second inclined guide rails 121 are respectively provided on the inclined surface 120, and the top surface has a plurality of second guiding grooves 122 that can be embedded up and down corresponding to the plurality of first guiding blocks 112 and the plurality of first guiding grooves 113 And a plurality of second guiding blocks 123.

The third extension block 13 is located on the left side of the first extension block 11. The top surface forms a plurality of convex teeth shape, and the front and rear ends respectively form two third inclined surfaces 130 inclined from bottom to top. Two third inclined guide rails 131 are respectively provided on the 130, and the bottom surface has a plurality of third guide blocks 132 and a trapezoid arranged alternately. A plurality of third guide grooves 133.

The fourth stretch block 14 is located on the lower side of the third stretch block 13. The bottom surface forms a plurality of convex teeth. The front and rear ends respectively form two fourth inclined surfaces 140 inclined from top to bottom. Two fourth inclined guide rails 141 are respectively provided on the inclined surface 140, and the top surface has a plurality of fourth guide grooves 142 that can be embedded up and down corresponding to the plurality of third guide blocks 132 and the plurality of third guide grooves 133. And a plurality of fourth guiding blocks 143.

The first guide block 15 is set on the front end surfaces of the first and second extension blocks 11, 12, and a first upper slope 150 corresponding to the first and second slopes 110, 120 at the front end is formed at the back end. And a first lower slope 151. The first upper slope 150 is provided with a first upper dovetail groove 152 for the first slope guide rail 111 at the front end to be slidably embedded therein, and the first lower slope 151 is provided with a first lower The dovetail groove 153 can be slidably embedded in the second inclined guide rail 121 at the front end. The front end of the first guide block 15 is formed with a first front inclined surface 154 inclined from back to front to outwards. A first front dovetail slot 155 is provided on it. In addition, two first front stoppers 156 protrude from the lower end of the first front inclined surface 154.

The second guide block 16 is set on the rear end surfaces of the first and second extension blocks 11, 12, and a second upper inclined surface 160 is formed at the front end corresponding to the first and second inclined surfaces 110, 120 respectively at the rear end. And a second lower inclined surface 161, the second upper inclined surface 160 is provided with a second upper dovetail groove 162 for the rear end of the first inclined guide rail 111 to be slidably embedded therein, and the second lower inclined surface 161 is provided with a second upper dovetail groove 162 The lower dovetail groove 163 allows the second inclined guide rail 121 at the rear end to be slidably embedded therein. A second back dovetail groove 165 is provided on the inclined surface 164. In addition, two second rear stoppers 166 protrude from the lower end of the second rear inclined surface 164.

The third guide block 17 is attached to the third and fourth stretch blocks 13, 14 A third upper slope 170 and a third lower slope 171 respectively corresponding to the third and fourth slopes 130 and 140 of the front end are formed on the front end, and a third upper dovetail is provided on the third upper slope 170 The groove 172 allows the third inclined guide rail 131 at the front end to be slidably embedded therein, and the third lower inclined surface 171 is provided with a third lower dovetail groove 173 for the fourth inclined guide rail 141 at the front end to be slidably embedded therein. The front end of the guide block 17 is formed with a third front inclined surface 174 inclined from back to front to outside, and a third front dovetail groove 175 is provided on the third front inclined surface 174. In addition, two third front stoppers 176 are protrudingly provided at the lower end of the third front inclined surface 174.

The fourth guide block 18 is set on the rear end surfaces of the third and fourth extension blocks 13, 14, and the front end is formed with a fourth upper inclined surface 180 corresponding to the third and fourth inclined surfaces 130 and 140 at the rear end, respectively. And a fourth lower slope 181, the fourth upper slope 180 is provided with a fourth upper dovetail groove 182 for the third slope guide 131 at the rear end to be slidably embedded therein, and the fourth lower slope 181 is provided with a fourth upper dovetail groove 182 The lower dovetail groove 183 can be slidably embedded in the fourth inclined guide rail 141 at the rear end. The rear end of the fourth guide block 18 is formed with a fourth rear inclined surface 184 inclined from front to back to the outside. A fourth rear dovetail groove 185 is provided on the inclined surface 184. In addition, two fourth rear stoppers 186 are protrudingly provided at the lower end of the fourth rear inclined surface 184.

The first pushing member 20 has two first pushing member inclined surfaces 23 corresponding to the first and third front inclined surfaces 154 and 174 on both sides, and two first pushing member guide rails 24 are respectively provided on the two first pushing member inclined surfaces 23 It can be slidably embedded in the first and third front dovetail grooves 155 and 175 respectively. In addition, two first blocking surfaces 25 are respectively provided on the upper and lower side surfaces of the first pushing member 20.

The second pushing member 30 has two second pushing member inclined surfaces 32 corresponding to the second and fourth rear inclined surfaces 164 and 184 on both sides, and two second pushing member guide rails 33 are respectively provided on the two second pushing member inclined surfaces 32 It can be slidably embedded in the second and fourth rear dovetail grooves 165 and 185, respectively. In addition, two second blocking surfaces 34 are respectively provided on the upper and lower sides of the second pushing member 30.

Please refer to the multi-stage brace described in this creation as shown in Figures 9-11 The stretching device performs the first stretching action, which indicates that when the bolt 40 is tightened, the first and second pushing members 20, 30 will be relatively close to simultaneously push the first guide block 15 and the second guide block 16. The third guide block 17 and the fourth guide block 18 make the first and second guide blocks 15, 16 and the third and fourth guide blocks 17, 18 follow the two first push pieces 20 respectively. A pusher inclined surface 23 and two second pusher inclined surfaces 32 of the second pusher 30 relatively slide outward (left and right), so that the first and second guide blocks 15, 16 and the third and fourth guide blocks The blocks 17 and 18 respectively drive the first and second stretch blocks 11 and 12 and the third and fourth stretch blocks 13 and 14 to expand laterally between the first and second pushing members 20 and 30 to expand the width.

Please refer to Figures 12-14 again. The multi-stage stretching device described in this creation performs the second stage of stretching. It points out when the two first stop surfaces 25 and the two second stop surfaces When 34 is blocked by the two first front stops 156, the two third front stops 176, the two second rear stops 166, and the two fourth rear stops 186 respectively, the first and second push members 20, The first and second stretch blocks 11 and 12 between 30 and the third and fourth stretch blocks 13, 14 can no longer continue to stretch horizontally. At this time, they stretch to the maximum width (this is the limit width of the first stretch) . Then, continue to tighten the bolt 40, the first and second extension blocks 11, 12 will follow the first upper slope 150, the first lower slope 151 and the second guide block 15 of the first guide block 15. The second upper slope 160 and the second lower slope 161 of the block 16 are displaced to form a longitudinal extension. At the same time, the third and fourth extension blocks 13, 14 will follow the third upper slope 170 of the third guide block 17 Displacement with the third lower inclined surface 171 and the fourth upper inclined surface 180 and the fourth lower inclined surface 181 of the fourth guide block 18 to form a longitudinal extension, so that the height can be adjusted to support an upper condyle 50 and lower The purpose of the condyle between 51.

The multi-stage stretching device provided by this creation will first stretch the first stretch to make the horizontal stretch to the maximum width, and then perform the second stretch to stretch the lengthwise to adjust the height, so it doesn't matter whether it needs to be stretched up or down. The height between the condyles of the spine will be stretched to the maximum width laterally to have a larger contact area, which not only has a better supporting effect and can prevent the condyle contact surface from being easily damaged by abrasion, so its single specification is very suitable It can be used in the interstitial spaces of different body types, different conditions and different diseased parts. Moreover, the two-stage extension can also greatly reduce the operating resistance, which can increase the smoothness and save effort.

Please refer to Figures 15-22, which is the second embodiment of the multi-stage expansion device of the present invention. Its structure is roughly the same as that of the above-mentioned first embodiment. The differences are as follows:

(1) One end of the sleeve rod 21 of this embodiment is screwed to the first push member 20.

(2) This embodiment does not use the two first stop surfaces 25 and the two second stop surfaces 34 of the first embodiment to be respectively supported by the two first front stoppers 156, the two third front stoppers 176 and the The two second rear stoppers 166 and the two fourth rear stoppers 186 block as the limit of the first extension, thus forming the conditions for performing the second extension. Rather, in this embodiment, the first front dovetail groove 155, the second rear dovetail groove 165, the third front dovetail groove 175, and the fourth rear dovetail groove 185 are respectively provided with a limit guide groove on the groove bottom surface. 60. One end of the limit guide grooves 60 is open, and the other end forms a limit stop surface 61. A convex portion 62 is protruded from one end of the two first pusher guide rails 24 and the two second pusher guide rails 33 respectively, so that the four convex portions 62 can slide in the four limit guide grooves 60 respectively. Please refer to Figures 18 and 20. When the bolt 40 is tightened until the four protrusions 62 are blocked by the limit stop surface 61 of the four limit guide groove 60, the first and second push members 20, 30 The first and second stretch blocks 11 and 12 and the third and fourth stretch blocks 13 and 14 can no longer continue to stretch horizontally. At this time, they stretch to the maximum width (this is the limit width of the first stretch). After that, when the bolt 40 is tightened, the first and second extension blocks 11, 12 will follow the first upper slope 150, the first lower slope 151 and the second guide block 15 The second upper inclined surface 160 and the second lower inclined surface 161 of the guide block 16 are displaced to form a longitudinal extension, and at the same time the third and fourth extension blocks 13, 14 will also move along the third upper slope 170 and the third lower slope 171 of the third guide block 17 and the fourth upper slope 180 and the fourth lower slope 181 of the fourth guide block 18 to form a longitudinal direction Stretching to form the second longitudinal stretching action.

(3) In this embodiment, the first upper dovetail groove 152, the first lower dovetail groove 153, the second upper dovetail groove 162, the second lower dovetail groove 163, the third upper dovetail groove 172, the The bottom surfaces of the third lower dovetail groove 173, the fourth upper dovetail groove 182, and the fourth lower dovetail groove 183 are respectively provided with a limiting guide groove 70, and one end of the limiting guide grooves 70 is open, and the other A locking surface 71 is formed at one end. At one end of the two first inclined guide rails 111, the two second inclined guide rails 121, the two third inclined guide rails 131, and the two fourth inclined guide rails 141, a clamping portion 72 is protrudingly provided. The eight clamping portions 72 can be separately provided. It slides in the eight limit guide grooves 70, and the locking surface 71 of the eight limit guide grooves 70 can block the eight clamping portion 72 to prevent the first, second, third, fourth The extension blocks 11, 12, 13, 14 are separated from the first, second, third, and fourth guide blocks 15, 16, 17, 18 (as shown in Figure 21, Figure 21 is the third inclined guide rail 131 and the first The four upper dovetail slots 182 are used to illustrate its limiting action, and the limiting actions of other relative positions are the same, so they are not shown in the figure).

(4) In this embodiment, two guiding structures 80 are provided between the first and third stretch blocks 11 and 13 and between the second and fourth stretch blocks 12 and 14, respectively. The two guide structures 80 can During longitudinal stretching, the first and third stretching blocks 11, 13 and the second and fourth stretching blocks 12, 14 are assisted in smoothly synchronized displacement. Please refer to FIG. 22 in conjunction. The two guiding structures 80 include a plurality of guiding holes 81 (in this embodiment, two examples are used for illustration) that penetrate the first, second, third, and fourth extension blocks 11 transversely, and two guides. Piece 82. The inner ends of the plurality of guide holes 81 each have a flange 810 with a smaller inner diameter. The two guides 82 are respectively provided between the first and third stretch blocks 11, 13 and between the second and fourth stretch blocks 12, 14. Each guide 82 includes two parallel guide rods 820 and a connection One connecting rod 821 in the center of the two guide rods 820, and the two ends of the two guide rods 820 of the two guide members 82 They are respectively telescopically inserted into the plurality of guide holes 81, and two ends of each guide rod 820 respectively have two expansion heads 822 with a larger outer diameter and elastically contractible, and the expansion heads 822 are beneficial to the guide rod 820 It passes through the guide hole 81 and can be blocked by the flange 810 to prevent the guide rod 820 from easily detaching from the guide hole 81. In this way, when stretched horizontally, between the first and third stretch blocks 11 and 13 and the second and fourth stretch blocks 12 and 14 can be translated smoothly by the two guiding structures 80 respectively. When stretched longitudinally, The first and third stretch blocks 11 and 13 and the second and fourth stretch blocks 12 and 14 can be moved up and down smoothly and synchronously by the two guiding structures 80 respectively.

Please refer to Figure 23, which is the third embodiment of the multi-stage stretching device of the present invention. Its structure is roughly the same as that of the above-mentioned second embodiment. The difference is that the two guides 82 of this embodiment are separate Only two guide rods 820 are included, and no connecting rods 821 are included. In this embodiment, the two guides 82 may also include only one, three or more guide rods 820, respectively, because they are only a simple increase or decrease in number, so no further description is given here.

Please refer to Figures 24 to 26, which is the fourth embodiment of the multi-stage expansion device according to the present invention. Its structure is roughly the same as that of the above-mentioned third embodiment. The difference lies in the first expansion of this embodiment. The block 11, the second stretch block 12, the third stretch block 13 and the fourth stretch block 14 respectively include a front block a and a rear block b. Correspondingly, the front block a and the back block b are slidably connected by corresponding mitered surfaces a1 and b1, and the corresponding mitered surfaces a1 and b1 are respectively provided with relatively sliding dovetail grooves b2 With the guide rail a2, when the plural front pieces a and the plural rear pieces b are stretched longitudinally, they can cooperate with the unevenness of the opposite surfaces of the upper and lower condyles 50 and 51 to form two stretches in sequence, thereby making the first stretch The upper and lower sides of the block 11, the second stretch block 12, the third stretch block 13 and the fourth stretch block 14 can therefore be matched with the shape, height or angle of the opposing surfaces of the upper and lower condyles 50, 51. Corresponding adjustments to obtain good and stable support, and then can be applied to patients with different conditions.

In the present invention, the first upper dovetail groove 152 and the first inclined guide rail 111, the first lower dovetail groove 153 and the second inclined guide rail 121, the second upper dovetail groove 162 and the first inclined guide rail 111, the first inclined guide rail 111, Two lower dovetail grooves 163 and the second inclined guide rail 121, the third upper dovetail groove 172 and the third inclined guide rail 131, the third lower dovetail groove 173 and the fourth inclined guide rail 141, the fourth upper dovetail groove 182 With the third inclined guide rail 131, the fourth lower dovetail groove 183 and the fourth inclined guide rail 141, the first and third front dovetail grooves 155, 175 and the two first pusher guide rails 24, the second and fourth rear The dovetail grooves 165 and 185, the two second pusher guide rails 33, and the dovetail groove b2 and the guide rail a2 can also be other concave-convex buckle group structures that can be slidably fitted.

Please refer to Figure 27, which points out that the multi-segment expansion device of the present invention can also be applied to bones (such as the vertebral body of the spine) for the reduction or repair of fractures. Of course, it can also be applied to such as intervertebral , Bones or soft tissues (such as facial depression reduction or repair)... and other related parts, and the material can be different according to the application position, for example, it can be metal, polymer material, PE, Silicone...etc.; and in this case, whether it is implanted horizontally or vertically, it can achieve the same functions and scope of application as above.

The above is only a description of the preferred implementations or examples of the technical means adopted by the present invention to solve the problems, and is not intended to limit the scope of implementation of the patent of the present invention. That is to say, all changes and modifications that are consistent with the scope of the patent application of the present invention or made in accordance with the scope of the patent of the present invention are all covered by the scope of the patent of the present invention.

10: Stretching module

11: The first stretch block

110: first slope

111: The first inclined guide rail

112: The first guide block

113: The first guide groove

12: The second stretch block

120: second slope

121: The second inclined rail

122: second guide groove

123: Second guide block

13: The third stretch block

130: Third Slope

131: The third inclined rail

132: Third Guiding Block

133: Third guide groove

14: Fourth stretch block

140: Fourth Incline

141: The fourth inclined rail

142: The fourth guide groove

143: Fourth Guiding Block

15: The first guide block

150: The first upper slope

151: The first lower slope

152: The first upper dovetail slot

154: first front slope

155: The first front dovetail slot

156: first front stop

16: second guide block

160: second upper slope

161: second lower slope

162: The second upper dovetail slot

163: The second dovetail slot

164: second rear slope

166: second rear stop

17: Third guide block

170: Third Upper Slope

171: Third Lower Slope

172: The Third Upper Dovetail Slot

174: Third Front Slope

175: The Third Front Dovetail Slot

176: third front stop

18: Fourth guide block

180: Fourth Upper Slope

181: Fourth Lower Slope

182: The fourth upper dovetail slot

183: The Fourth Dovetail Slot

184: Fourth rear slope

186: Fourth rear stop

20: The first push

21: Set of rods

22: screw hole

23: The first push piece slope

24: The first push piece guide rail

25: The first stop surface

30: The second push

31: Piercing

32: The second pusher slope

33: The second push piece guide rail

34: second stop surface

40: Bolt

41: Screw part

42: head

Claims (15)

A multi-stage stretching device includes: An extension module can produce longitudinal extension and lateral extension; A first pusher is arranged at the front end of the stretching module and has a screw hole inside; A second pusher is arranged at the rear end of the stretching module and has a through hole inside; and A bolt has a screw portion and a head, the screw portion passes through the through hole of the second push member and is screwed in the screw hole of the first push member, and the head abuts against the second push member. On one side of the first push member, tighten the bolt to make the first push member and the second push member relatively close to push the stretch module to produce a first stretch and a second stretch. One stretch is to make the stretch module extend the width horizontally, and the second stretch is performed after the first stretch to the maximum transverse stretch width, which can be used to adjust the longitudinal stretch height of the stretch module. The multi-stage stretching device according to claim 1, wherein the stretching module includes a first stretching block, a second stretching block, a third stretching block, a fourth stretching block, a first guide block, and a A second guide block, a third guide block and a fourth guide block, the second stretch block is located on the lower side of the first stretch block, the third stretch block is located on the left side of the first stretch block, the fourth stretch block The block is located on the lower side of the third extension block, the first guide block is slidably embedded on the front end surfaces of the first and second extension blocks, and the second guide block is slidably embedded on the rear end surfaces of the first and second extension blocks , And make the first and second stretch blocks move up and down between the first and second guide blocks to form a longitudinal stretch, the third guide block is slidingly embedded in the front end surface of the third and fourth stretch blocks, The fourth guide block is slidingly embedded on the rear end faces of the third and fourth stretch blocks, and the third and fourth stretch blocks can move up and down between the third and fourth guide blocks to form longitudinal stretch. The first pusher is slidingly embedded in the front end surfaces of the first and third guide blocks, and the second pusher is slidingly embedded in the second and fourth guide blocks. The rear end surface of the block, and the first and second guide blocks and the third and fourth guide blocks can respectively drive the first and second stretch blocks and the third and fourth stretch blocks between the first and second push parts Displace left and right to form lateral extension. The multi-stage stretching device as described in claim 2, wherein: The front and rear ends of the first extension block are respectively formed with two first inclined surfaces inclined from the bottom up to the outside; The front and rear ends of the second extension block respectively form two second inclined surfaces inclined from top to bottom to the outside; The front and rear ends of the third extension block are respectively formed with two third inclined surfaces inclined from the bottom to the top to the outside; The front and rear ends of the fourth extension block respectively form a fourth inclined surface that slopes from top to bottom to the outside; The rear end of the first guide block is formed with a first upper slope and a first lower slope corresponding to the first and second slopes at the front end, and the front end of the first guide block is formed with One of the first front slopes of the outer slope; The front end of the second guide block is formed with a second upper slope and a second lower slope corresponding to the first and second slopes at the rear end, and the rear end of the second guide block is formed with a front-to-back facing One of the second rear slopes of the outer slope; The rear end of the third guide block is formed with a third upper slope and a third lower slope corresponding to the third and fourth slopes at the front end, and the front end of the third guide block is formed with One of the third front slopes of the outer slope; The front end of the fourth guide block is formed with a fourth upper slope and a fourth lower slope corresponding to the third and fourth slopes of the rear end, and the rear end of the fourth guide block is formed with a front-to-back facing One of the fourth rear slopes of the outer slope; Both sides of the first pushing member are provided with two first pushing member inclined surfaces corresponding to the first and third front inclined surfaces; Both sides of the second pushing member are provided with two second pushing member inclined surfaces corresponding to the second and fourth rear inclined surfaces; Among them, between the two first slopes and the first and second upper slopes, between the two second slopes and the first and second lower slopes, between the two third slopes and the third and fourth upper slopes, Between the two fourth slopes and the third and fourth lower slopes, the two first pusher slopes and the first and third front slopes, and the two second pusher slopes and the second and fourth rear slopes Each is provided with a concave-convex buckle group structure that can be slid and embedded correspondingly. The multi-stage stretching device according to claim 3, wherein the two first slopes are respectively provided with two first slope guide rails, the two second slopes are respectively provided with two second slope guide rails, and the two third slopes Two third inclined guide rails are respectively provided, two fourth inclined guide rails are respectively provided on the two fourth inclined surfaces, and a first upper dovetail groove is provided on the first upper inclined surface for the first inclined guide rail at the front end to be slidably embedded in it , The first lower slope is provided with a first lower dovetail groove for the front end of the second slope guide rail to be slidably embedded in it, the first front slope is provided with a first front dovetail groove, and the second upper slope is provided with a The second upper dovetail groove allows the first inclined guide rail at the rear end to be slidably embedded therein, and a second lower dovetail groove is provided on the second lower inclined surface for the second inclined guide rail at the rear end to be slidably embedded therein. A second back dovetail groove is provided on the two rear slopes, a third upper dovetail groove is provided on the third upper slope, and the third slope guide rail at the front end can be slidably embedded in the third upper slope. A third lower slope is provided on the third lower slope. The dovetail groove allows the fourth inclined guide rail at the front end to be slidably embedded in it, the third front inclined surface is provided with a third front dovetail groove, and the fourth upper inclined surface is provided with a fourth upper dovetail groove for the rear end of the first dovetail groove. The three-inclined guide rail is slidably embedded therein, a fourth lower dovetail groove is provided on the fourth lower sloping surface for the fourth sloping surface guide rail at the rear end to be slidably embedded in it, and a fourth rear dovetail groove is provided on the fourth rear sloping surface, The two first pushing member slopes are respectively provided with two first pushing member guide rails which can be slidably embedded in the first and third front dovetail grooves respectively, and the two second pushing member slopes are respectively provided with two second pushing members The guide rails can be slidably inserted into the second and fourth rear dovetail grooves respectively Among. The multi-stage stretching device according to claim 4, wherein the lower end of the first front inclined surface is convexly provided with two first front stoppers, the lower end of the second rear inclined surface is convexly provided with two second rear stoppers, the first Two third front stoppers are protrudingly provided at the rear lower end of the three front slopes, two fourth rear stoppers are protrudingly provided at the lower end of the fourth rear slope, and the upper and lower side surfaces of the first pusher respectively have two first stop surfaces , The upper and lower sides of the second push member respectively have two second stop surfaces, the two first stop surfaces and the two second stop surfaces can be respectively supported by the two first front stoppers and the two second stop surfaces. The three front stops, the two second rear stops, and the two fourth rear stops block so that the lateral extension can no longer be continued, and the limit width of the first extension is reached. The multi-stage stretching device according to claim 2, wherein a set of rods protrudes from the rear side of the first pushing member, and the screw hole is set in the set of rods. The multi-stage stretching device according to claim 6, wherein one end of the sleeve rod is screwed to the first push member. The multi-stage stretching device according to claim 2, wherein the bottom surface of the first stretching block has a plurality of first guiding blocks and a plurality of first guiding grooves which are arranged alternately and in a trapezoid shape, and the second stretching block has a The top surface has a plurality of second guide grooves and a plurality of second guide blocks that can be inserted up and down corresponding to the plurality of first guide blocks and the plurality of first guide grooves, and the bottom surface of the third extension block is There are a plurality of third guide blocks and a plurality of third guide grooves which are arranged alternately and are in a trapezoid shape. Corresponding to the plurality of fourth guide grooves and the plurality of fourth guide blocks embedded up and down. The multi-stage expansion device according to claim 4, wherein the first front dovetail groove, the second rear dovetail groove, the third front dovetail groove, and the fourth rear dovetail groove have a limit on the groove bottom surface respectively Guide grooves, one end of the limit guide grooves is open, and the other end forms a limit stop surface, the two first pusher guide rails and the two second pusher guide rails One end is respectively protruding with a convex part, the four convex parts can be respectively slid in the four limit guide grooves, and the four convex parts can be blocked by the limit stop surfaces of the four limit guide grooves respectively, making it impossible to continue Stretching laterally, and then reaching the limit width of the first stretch. The multi-stage expansion device according to claim 5 or 9, wherein the first upper dovetail groove, the first lower dovetail groove, the second upper dovetail groove, the second lower dovetail groove, and the third upper dovetail groove , The third lower dovetail groove, the fourth upper dovetail groove and the fourth lower dovetail groove are respectively provided with a limit guide groove on the bottom surface of the groove, one end of the limit guide grooves is open, and the other end forms a The two first inclined guide rails, the two second inclined guide rails, the two third inclined guide rails, and the two fourth inclined guide rails are each protruding with a clamping portion at one end, and the eight clamping portions can be attached to the eight Sliding in the limit guide groove, the locking surface of the eight limit guide groove can block the eight clamping part, so that the first, second, third, and fourth extension blocks cannot easily be separated from the first and second extension blocks when the edge is extended. , Three and four guide blocks. The multi-stage stretching device according to claim 2, further comprising two guiding structures, which are respectively arranged between the first and third stretching blocks and between the second and fourth stretching blocks, It can assist the smooth synchronous displacement of the first and third stretching blocks and the second and fourth stretching blocks during stretching. The multi-stage stretching device according to claim 11, wherein the two guide structures include a plurality of guide holes and two guide members respectively penetrating the first, second, third, and fourth stretch blocks transversely, and the two guide members are respectively Correspondingly disposed between the first and third stretch blocks and between the second and fourth stretch blocks, each guide includes at least one guide rod, and the two ends of the guide rod are respectively telescopically inserted into the corresponding Of the two pilot holes. The multi-stage stretching device according to claim 11, wherein the two guide structures include a plurality of guide holes and two guide members respectively penetrating the first, second, third, and fourth stretch blocks transversely, and the two guide members are respectively Correspondingly set between the first and third extension blocks and between the second and fourth extension blocks, each guide includes two parallel guide rods and a connecting rod connecting the centers of the two guide rods, and makes the two guide rods The ends of the two guide rods are telescopically Insert in the corresponding plural guide holes. The multi-stage stretching device according to claim 2, wherein the first stretching block, the second stretching block, the third stretching block, and the fourth stretching block each include a front block and a rear block, respectively. The corresponding anterior block and the posterior block are slidably connected by the corresponding mitered surface, so that the plural anterior blocks and the plural posterior blocks can cooperate with the unevenness of the opposite surfaces of the upper and lower condyles to form a longitudinal direction in sequence The second stretch. The multi-stage stretching device according to claim 14, wherein the two corresponding mitered surfaces are respectively provided with relatively sliding dovetail grooves and guide rails.

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