CN112741716A

CN112741716A - Multi-section expanding device

Info

Publication number: CN112741716A
Application number: CN201911040422.0A
Authority: CN
Inventors: 黄孟锋
Original assignee: Heshuo Biotech Co ltd
Current assignee: Heshuo Biotech Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2021-05-04
Anticipated expiration: 2039-10-29

Abstract

The invention provides a multi-section stretching device, which comprises a stretching module, a first pushing piece and a second pushing piece which are arranged at the front end and the rear end of the stretching module, and a bolt which is screwed between a first sliding block and a second sliding block, wherein the bolt is screwed to enable the first sliding block and the second sliding block to be relatively close to each other so as to push the stretching module to generate a first section of stretching and a second section of stretching, the first section of stretching enables the stretching module to stretch transversely, the second section of stretching is performed after the first section of stretching reaches the maximum width, the longitudinal stretching height of the stretching module can be adjusted, and therefore, the stretching device can have a larger width no matter how large the distance between an upper vertebra section and a lower vertebra section is stretched, so that the stretching device has a better supporting effect and can prevent the contact surface of the vertebra sections from being easily abraded and recessed.

Description

Multi-section expanding device

Technical Field

The invention relates to the technical field of structures of extension implants, in particular to a multi-section type extension device which can have larger width no matter how large the distance between an upper bone section and a lower bone section is extended, has better supporting effect and can prevent the contact surface of the bone sections from being easily abraded and damaged by concave.

Background

At present, the minimally invasive surgery of the intervertebral fusion mainly comprises the steps of establishing a micro channel at an affected part, then sending an intervertebral fusion device with small volume to the space between upper and lower vertebral segments of the affected part through the micro channel by utilizing the assistance of an endoscope or X-ray, and then longitudinally stretching the intervertebral fusion device to enable the intervertebral fusion device to be supported on the opposite end surfaces of the upper and lower vertebral segments so as to achieve the aim of clinical intervertebral fusion.

One conventional intervertebral cage, as shown in U.S. Pat. Nos. US9,883,955B2 and US10,045,858B2, is expandable in only one direction, and when it is longitudinally implanted between upper and lower vertebral segments, it is longitudinally expandable to be supported between the upper and lower vertebral segments, and since the contact area with the upper and lower vertebral segments is very small, it is easy for the end surfaces of the upper and lower vertebral segments to be worn away to form a recess. When the intervertebral disc is transversely implanted between the upper and lower vertebral segments, although the intervertebral disc can transversely stretch and expand to increase the width to increase the contact area and further improve the problem of abrasion and depression of the vertebral segments, the height of the intervertebral disc cannot be adjusted because the height of the intervertebral disc is fixed, so that the intervertebral disc cannot be resisted on the opposite end surfaces of the upper and lower vertebral segments when the distance between the upper and lower vertebral segments of a patient is larger, and the aim of intervertebral fusion is lost.

Another conventional intervertebral cage, as shown in us US8,864,833B2 and us US10,098,758B2, can be extended longitudinally and transversely at the same time, but the height requirement of the longitudinal extension of the intervertebral cage is different according to the size, severity and affected part of each individual, so when it is implanted between the upper and lower vertebral segments, which need to be extended longitudinally to a greater height, it can be extended longitudinally and transversely to a greater height, and there is no problem that the end faces of the segments are easily worn to form depressions. However, when it is implanted between the upper and lower vertebral segments, which need to be longitudinally stretched to a small height, the longitudinal stretching distance is limited to be small or none, and the transverse stretching distance is linked with the longitudinal stretching distance, so the relative transverse stretching distance is relatively small or none, and the width is insufficient, which causes the problem that the end surfaces of the vertebral segments are easily worn to form recesses, similar to a nominal one. Furthermore, the longitudinal stretching and the transverse stretching are performed simultaneously, which relatively increases the operation resistance, thereby causing problems of poor smoothness and labor consumption.

Disclosure of Invention

The invention aims to provide a multi-section stretching device, which solves the technical problems in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a multi-section expanding device, comprising:

the stretching module can generate longitudinal stretching and transverse stretching;

the first pushing piece is arranged at the front end of the stretching module and internally provided with a screw hole;

the second pushing piece is arranged at the rear end of the stretching module and internally provided with a through hole; and

the bolt is provided with a screw rod part and a head part, the screw rod part penetrates through the through hole of the second pushing part and is arranged in the screw hole of the first pushing part in a threaded mode, the head part is abutted against one side, opposite to the first pushing part, of the second pushing part, the first pushing part and the second pushing part can be relatively close to each other by screwing the bolt so as to push the stretching module to generate first section stretching and second section stretching, the first section stretching enables the stretching module to stretch transversely, the second section stretching is conducted after the first section stretching is conducted to the maximum transverse stretching width, and the longitudinal stretching height of the stretching module can be adjusted.

The multi-section stretching device comprises: the stretching module comprises a first stretching block, a second stretching block, a third stretching block, a fourth stretching block, a first guide block, a second guide block, a third guide block and a fourth guide block, wherein the second stretching block is positioned at the lower side of the first stretching block, the third stretching block is positioned at the left side of the first stretching block, the fourth stretching block is positioned at the lower side of the third stretching block, the first guide block is slidably embedded at the front end surfaces of the first stretching block and the second stretching block, the second guide block is slidably embedded at the rear end surfaces of the first stretching block and the second stretching block, the first stretching block and the second stretching block can move up and down between the first guide block and the second guide block to form longitudinal stretching, the third guide block is slidably embedded at the front end surfaces of the third stretching block and the fourth stretching block, and the fourth guide block is slidably embedded at the rear end surfaces of the third stretching block and the fourth stretching block, and the third stretching block and the fourth stretching block can move up and down to form longitudinal stretching between the third guide block and the fourth guide block, the first pushing piece is slidably embedded in the front end faces of the first guide block and the third guide block, the second pushing piece is slidably embedded in the rear end faces of the second guide block and the fourth guide block, and the first guide block, the second guide block, the third guide block and the fourth guide block can respectively drive the first stretching block, the second stretching block, the third stretching block and the fourth stretching block to move left and right between the first pushing piece and the second pushing piece to form transverse stretching.

The multi-section stretching device comprises:

the front end and the rear end of the first stretching block are respectively provided with two first inclined planes which incline from bottom to top to outside;

the front end and the rear end of the second stretching block are respectively provided with two second inclined planes which are inclined from top to bottom to outside;

the front end and the rear end of the third stretching block respectively form two third inclined surfaces which are inclined from bottom to top to outside;

the front end and the rear end of the fourth stretching block are respectively provided with a fourth inclined plane which is inclined from top to bottom to outside;

the rear end of the first guide block is provided with a first upper inclined plane and a first lower inclined plane which respectively correspond to the first inclined plane and the second inclined plane at the front end, and the front end of the first guide block is provided with a first front inclined plane which inclines from back to front to outside;

the front end of the second guide block is provided with a second upper inclined plane and a second lower inclined plane which respectively correspond to the first inclined plane and the second inclined plane at the rear end, and the rear end of the second guide block is provided with a second rear inclined plane which inclines from front to rear outwards;

a third upper inclined plane and a third lower inclined plane which are respectively corresponding to the third inclined plane and the fourth inclined plane at the front end are formed at the rear end of the third guide block, and a third front inclined plane which inclines from back to front to outside is formed at the front end of the third guide block;

a fourth upper inclined plane and a fourth lower inclined plane which are respectively corresponding to the third inclined plane and the fourth inclined plane at the rear end are formed at the front end of the fourth guide block, and a fourth rear inclined plane which is inclined from front to rear outwards is formed at the rear end of the fourth guide block;

two sides of the first pushing piece are provided with two first pushing piece inclined planes corresponding to the first front inclined plane and the third front inclined plane;

two sides of the second pushing piece are provided with two second pushing piece inclined planes corresponding to the second and the fourth rear inclined planes;

wherein, concave-convex buckling group structures which can be correspondingly embedded in a sliding way are respectively arranged between the two first inclined planes and the first and the second upper inclined planes, between the two second inclined planes and the first and the second lower inclined planes, between the two third inclined planes and the third and the fourth upper inclined planes, between the two fourth inclined planes and the third and the fourth lower inclined planes, between the two first pushing part inclined planes and the first and the third front inclined planes and between the two second pushing part inclined planes and the second and the fourth rear inclined planes.

The multi-section stretching device comprises: the two first inclined planes are respectively provided with two first inclined plane guide rails, the two second inclined planes are respectively provided with two second inclined plane guide rails, the two third inclined planes are respectively provided with two third inclined plane guide rails, the two fourth inclined planes are respectively provided with two fourth inclined plane guide rails, the first upper inclined plane is provided with a first upper dovetail groove for the first inclined plane guide rail at the front end to be slidably embedded in, the first lower inclined plane is provided with a first lower dovetail groove for the second inclined plane guide rail at the front end to be slidably embedded in, the first front inclined plane is provided with a first front dovetail groove, the second upper inclined plane is provided with a second upper dovetail groove for the first inclined plane guide rail at the rear end to be slidably embedded in, the second lower inclined plane is provided with a second lower dovetail groove for the second inclined plane guide rail at the rear end to be slidably embedded in, the second rear inclined plane is provided with a second rear dovetail groove, the third upper inclined plane is provided with a third upper dovetail groove for the third inclined plane guide rail at the front end to be slidably embedded in, the third lower oblique surface is provided with a third lower dovetail groove for the sliding embedding of the fourth oblique surface guide rail at the front end, the third front oblique surface is provided with a third front dovetail groove, the fourth upper oblique surface is provided with a fourth upper dovetail groove for the sliding embedding of the third oblique surface guide rail at the rear end, the fourth lower oblique surface is provided with a fourth lower dovetail groove for the sliding embedding of the fourth oblique surface guide rail at the rear end, the fourth rear oblique surface is provided with a fourth rear dovetail groove, the two first pushing part oblique surfaces are respectively provided with two first pushing part guide rails for respectively sliding embedding in the first front dovetail groove and the third front dovetail groove, and the two second pushing part oblique surfaces are respectively provided with two second pushing part guide rails for respectively sliding embedding in the second rear dovetail groove and the fourth rear dovetail groove.

The multi-section stretching device comprises: the lower end of the first front inclined plane is convexly provided with two first front stop blocks, the lower end of the second rear inclined plane is convexly provided with two second rear stop blocks, the rear lower end of the third front inclined plane is convexly provided with two third front stop blocks, the lower end of the fourth rear inclined plane is convexly provided with two fourth rear stop blocks, the upper side surface and the lower side surface of the first pushing piece are respectively provided with two first stop surfaces, the upper side surface and the lower side surface of the second pushing piece are respectively provided with two second stop surfaces, and the two first stop surfaces and the two second stop surfaces can be respectively stopped by the two first front stop blocks, the two third front stop blocks, the two second rear stop blocks and the two fourth rear stop blocks so as to prevent the transverse stretching from continuing and further achieve the limit width of the first section of stretching.

The multi-section stretching device comprises: a sleeve rod is convexly extended from the rear side of the first pushing piece, and the screw hole is arranged in the sleeve rod.

The multi-section stretching device comprises: one end of the loop bar is combined on the first pushing piece in a threaded mode.

The multi-section stretching device comprises: the bottom surface of the first stretching block is provided with a plurality of first guide blocks and a plurality of first guide grooves which are staggered with each other and are trapezoidal, the top surface of the second stretching block is provided with a plurality of second guide grooves and a plurality of second guide blocks which can be correspondingly upwards and downwards embedded with the plurality of first guide blocks and the plurality of first guide grooves, the bottom surface of the third stretching block is provided with a plurality of third guide blocks and a plurality of third guide grooves which are staggered with each other and are trapezoidal, and the top surface of the fourth stretching block is provided with a plurality of fourth guide grooves and a plurality of fourth guide blocks which can be correspondingly upwards and downwards embedded with the plurality of third guide blocks and the plurality of third guide grooves.

The multi-section stretching device comprises: the first front dovetail groove, the second rear dovetail groove, the third front dovetail groove and the fourth rear dovetail groove are respectively provided with a limit guide groove on the groove bottom surface, one end of each limit guide groove is in an opening shape, the other end of each limit guide groove forms a limit stop surface, one end of each of the two first pushing guide rails and one end of each of the two second pushing guide rails are respectively provided with a convex part in a protruding mode, the four convex parts can slide in the four limit guide grooves respectively, the four convex parts can be respectively stopped by the limit stop surfaces of the four limit guide grooves, and therefore transverse stretching cannot be continued, and the limit width of the first section stretching is further achieved.

The multi-section stretching device comprises: the first upper dovetail groove, the first lower dovetail groove, the second upper dovetail groove, the second lower dovetail groove, 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 limiting guide groove on the groove bottom surface, one end of the limiting guide groove is open, the other end of the limiting guide groove forms a clamping surface, one end of each of 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 is respectively provided with a clamping part in a protruding mode, the eight clamping parts can respectively slide in the eight limiting guide grooves, and the clamping surfaces of the eight limiting guide grooves can block the eight clamping parts, so that the first, second, third and fourth extension blocks can not be easily separated from the first, second, third and fourth guide blocks when the edges are extended.

The multi-section stretching device comprises: the two guide structures are respectively arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, and can assist the first stretching block, the third stretching block, the second stretching block and the fourth stretching block to smoothly and synchronously displace when stretching.

The multi-section stretching device comprises: the two guide structures comprise a plurality of guide holes and two guide members, wherein the guide holes respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide members are respectively and correspondingly arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, each guide member comprises at least one guide rod, and two ends of each guide rod are respectively and telescopically inserted into the corresponding two guide holes.

The multi-section stretching device comprises: the two guide structures comprise a plurality of guide holes and two guide members, wherein the guide holes respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide members are respectively and correspondingly arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, each guide member comprises two parallel guide rods and a connecting rod connected with the centers of the two guide rods, and two ends of the two guide rods of the two guide members are respectively telescopically inserted into the corresponding guide holes.

The multi-section stretching device comprises: the first stretching block, the second stretching block, the third stretching block and the fourth stretching block respectively comprise a front block and a rear block, and the corresponding front block and the rear block are in sliding connection through corresponding scarfed surfaces, so that the plurality of front blocks and the plurality of rear blocks can be matched with unevenness of opposite surfaces of the upper bone section and the lower bone section to sequentially form longitudinal two-stage stretching.

The multi-section stretching device comprises: the two corresponding oblique joint surfaces are respectively provided with a dovetail groove and a guide rail which are oppositely and slidably embedded.

The multi-section stretching device provided by the invention can firstly stretch the first section to transversely stretch to the maximum width, and then stretch the second section to longitudinally stretch to adjust the height, so that the device can transversely stretch to the maximum width and has a larger contact area no matter how high the longitudinal stretching between the upper vertebra section and the lower vertebra section is needed, and the device not only has a better supporting effect, but also can prevent the contact surface of the bone sections from being easily abraded and damaged, so that the device with a single specification is very suitable for the bone section gaps of various body types, different illness states and different diseased parts. Moreover, the two-stage stretching can greatly reduce the operation resistance, thereby increasing the smoothness and saving the labor.

Drawings

Fig. 1 is a schematic exploded perspective view of a first embodiment of the present invention.

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

Fig. 3 is a perspective combination enlarged view of the first embodiment of the present invention.

Fig. 4 is a top view of fig. 3.

Fig. 5 is a front view of fig. 3.

Fig. 6 is a right side view of fig. 3.

Fig. 7 is a schematic sectional view taken along line a-a of fig. 5.

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

Fig. 9 is a schematic perspective view illustrating the first section of the first embodiment of the present invention when stretched.

Fig. 10 is a schematic front view of the first embodiment of the present invention in its expanded state.

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

Fig. 12 is a schematic perspective view illustrating the second stage of the first embodiment of the present invention during stretching.

FIG. 13 is a schematic diagram of a front view of the second section of the first embodiment of the present invention in its extended position.

Fig. 14 is an enlarged schematic view of the cross-section D-D of fig. 13.

Fig. 15 is an exploded perspective view of a second embodiment of the present invention.

Fig. 16 is another exploded perspective view of the second embodiment of the present invention.

FIG. 17 is an enlarged perspective view of a second embodiment of the present invention in a fully condensed state.

Fig. 18 is an enlarged perspective view of the second embodiment of the present invention when the first section is extended to the limit.

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

FIG. 20 is a cross-sectional view of the second embodiment of the present invention showing the first section extended to the limit.

Fig. 21 is a schematic operation diagram of a limiting structure according to a second embodiment of the present invention.

Fig. 22 is a schematic operation diagram of a guiding structure according to a second embodiment of the present invention.

Fig. 23 is a schematic exploded perspective view of a third embodiment of the present invention.

Fig. 24 is a partially exploded and enlarged perspective view of the fourth embodiment of the present invention.

Fig. 25 is an enlarged perspective view of the second longitudinal segment in an extended state according to the fourth embodiment of the present invention.

Fig. 26 is a schematic view of the fourth embodiment of the invention in a state of stretching two longitudinal sections.

Figure 27 is a schematic illustration of the invention applied to the inside of a bone.

Description of reference numerals: 10, stretching the module; 11 a first stretching block; 110 a first inclined plane; 111 a first ramp track; 112 a first guide block; 113 a first guide groove; 12 a second stretching block; 120 a second bevel; 121 a second ramp guide; 122 a second guide groove; 123 a second guide block; 13 a third stretching block; 130 a third inclined plane; 131 a third ramp track; 132 a third guide block; 133 a third guide groove; 14 a fourth stretching block; 140 a fourth bevel; 141 a fourth ramp track; 142 a fourth guide groove; 143 a fourth guide block; 15 a first guide block; 150 a first upper inclined plane; 151 a first lower inclined surface; 152 a first upper dovetail slot; 153 first lower dovetail slot; 154 a first front bevel; 155 a first forward dovetail slot; 156 a first positive stop; 16 a second guide block; 160 a second upper inclined surface; 161 second lower inclined plane; 162 a second upper dovetail slot; 163 second lower dovetail slot; 164 second rear slope; 165 a second posterior dovetail slot; 166 a second rear stop; 17 a third guide block; 170 third upper inclined plane; 171 a third lower incline; 172 a third upper dovetail slot; 173 third lower dovetail slot; 174 a third front slope; 175 a third forward dovetail slot; 176 a third positive stop; 18 a fourth guide block; 180 a fourth upper ramp; 181 a fourth lower inclined surface; 182 fourth upper dovetail slot; 183 fourth lower dovetail slot; 184 fourth rear slope; 185 fourth rear dovetail slot; 186 fourth rear stops; 20 a first push member; 21, sleeving a rod; 22 screw holes; 23 a first pusher ramp; 24 a first pusher rail; 25 a first stop surface; 30 a second pushing piece; 31 punching a hole; 32 a second pusher ramp; 33 a second pusher rail; 34 a second stop surface; 40 bolts; a 41 screw part; 42 a head portion; 50 upper condyle; 51 lower condyle; 60 limit guide slots; 61 limit stop surface; 62 a convex part; 70 limiting the guide groove; 71 a clamping surface; 72 a clamping part; 80 a guide structure; 81 guide holes; 810 a flange; 82 a guide member; 820 a guide bar; 821 connecting rods; 822 an expansion head; a front block; a1 miter; a2 guide rail; b, a rear block; b1 miter; b2 dovetail grooves.

Detailed Description

Fig. 1-14 illustrate a first embodiment of a two-segment extended interbody cage of the present invention.

Referring to fig. 1 to 8, it is shown that the multi-section stretching device of the present invention includes a stretching module 10, a first pushing member 20, a second pushing member 30 and a bolt 40, wherein:

the stretching module 10 can produce longitudinal stretching and transverse stretching;

the first pushing member 20 is disposed at the front end of the stretching module 10, a sleeve rod 21 is protruded from the rear side of the first pushing member 20, and a screw hole 22 is formed inside the sleeve rod 21;

the second pushing member 30 is disposed 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 portion 42 with a larger outer diameter, the screw portion 41 passes through the through hole 31 of the second pushing member 30 and is screwed into the screw hole 22 of the first pushing member 20, and the head portion 42 abuts against a side of the second pushing member 30 opposite to the first pushing member 20.

Referring to fig. 3,9 and 12, the bolt 40 is locked to enable the first pushing member 20 and the second pushing member 30 to approach each other relatively to push the expansion module 10 to generate a first section of expansion and a second section of expansion, the first section of expansion enables the expansion module 10 to expand in a transverse direction, and the second section of expansion is performed after the first section of expansion is expanded to a maximum width, so that the longitudinal expansion height of the expansion module 10 can be adjusted as required.

The stretching module 10 includes a first stretching block 11, a second stretching block 12, a third stretching block 13, a fourth stretching block 14, a first guide block 15, a second guide block 16, a third guide block 17 and a fourth guide block 18, wherein:

the first extending block 11 has a plurality of teeth on its top surface, two first inclined planes 110 inclined from bottom to top at its front and back ends, two first inclined plane guide rails 111 on the two first inclined planes 110, and a plurality of trapezoidal first guide blocks 112 and a plurality of trapezoidal first guide grooves 113 on its bottom surface.

The second extension block 12 is located at the lower side of the first extension block 11, the bottom surface forms a plurality of convex tooth shapes, the front and rear ends respectively form two second inclined planes 120 inclined from top to bottom to outside, the two second inclined planes 120 are respectively provided with two second inclined plane guide rails 121, and the top surface is provided with a plurality of second guide grooves 122 and a plurality of second guide blocks 123 which can be embedded in an upward and downward sliding manner corresponding to the plurality of first guide blocks 112 and the plurality of first guide grooves 113.

The third stretching block 13 is located on the left side of the first stretching block 11, the top surface thereof is formed in a plurality of convex tooth shapes, the front end and the rear end thereof are respectively formed with two third inclined surfaces 130 inclined from bottom to top, the two third inclined surfaces 130 are respectively provided with two third inclined surface guide rails 131, and the bottom surface thereof is provided with a plurality of trapezoidal third guide blocks 132 and a plurality of trapezoidal third guide grooves 133 which are arranged in a staggered manner.

The fourth extension block 14 is located at the lower side of the third extension block 13, the bottom surface of which forms a plurality of convex tooth shapes, the front and rear ends of which respectively form two fourth inclined planes 140 inclined from top to bottom to outside, the two fourth inclined planes 140 are respectively provided with two fourth inclined plane guide rails 141, and the top surface of which is provided with a plurality of fourth guide grooves 142 and a plurality of fourth guide blocks 143 which can be embedded in an upward and downward sliding manner corresponding to the plurality of third guide blocks 132 and the plurality of third guide grooves 133.

The first guide block 15 is disposed on the front end surfaces of the first and second extending

blocks

11, 12, and has a first upper inclined surface 150 and a first lower inclined surface 151 formed at the rear end thereof corresponding to the first and second

inclined surfaces

110, 120 at the front end, respectively, the first upper inclined surface 150 is provided with a first upper dovetail groove 152 for slidably fitting the first inclined surface guide rail 111 at the front end therein, the first lower inclined surface 151 is provided with a first lower dovetail groove 153 for slidably fitting the second inclined surface guide rail 121 at the front end therein, the front end of the first guide block 15 is formed with a first front inclined surface 154 inclined from back to front to outside, and the first front inclined surface 154 is provided with a first front dovetail groove 155. Two first front stoppers 156 are protruded from the lower end of the first front inclined surface 154.

The second guide block 16 is disposed on the rear end surfaces of the first and second extending

blocks

11, 12, and has a front end formed with a second upper inclined surface 160 and a second lower inclined surface 161 corresponding to the first and second

inclined surfaces

110, 120 of the rear end, respectively, the second upper inclined surface 160 is provided with a second upper dovetail groove 162 for the first inclined surface guide rail 111 of the rear end to be slidably inserted therein, the second lower inclined surface 161 is provided with a second lower dovetail groove 163 for the second inclined surface guide rail 121 of the rear end to be slidably inserted therein, the rear end of the second guide block 16 is formed with a second rear inclined surface 164 inclined from front to rear and outward, and the second rear inclined surface 164 is provided with a second rear dovetail groove 165. Two second rear stoppers 166 are protruded from the lower ends of the second rear slopes 164.

The third guide block 17 is disposed on the front end surfaces of the third and fourth extending

blocks

13, 14, and has a third upper inclined surface 170 and a third lower inclined surface 171 formed on the rear end thereof and corresponding to the third and fourth

inclined surfaces

130, 140 of the front end, respectively, the third upper inclined surface 170 is provided with a third upper dovetail groove 172 for slidably fitting the third inclined surface guide rail 131 of the front end therein, the third lower inclined surface 171 is provided with a third lower dovetail groove 173 for slidably fitting the fourth inclined surface guide rail 141 of the front end therein, the front end of the third guide block 17 is formed with a third front inclined surface 174 inclined from back to front, and the third front inclined surface 174 is provided with a third front dovetail groove 175. Two third front stops 176 are protruded from the lower end of the third front inclined plane 174.

The fourth guide block 18 is disposed on the rear end surfaces of the third and fourth extending

blocks

13, 14, and has a front end formed with a fourth upper inclined surface 180 and a fourth lower inclined surface 181 corresponding to the third and fourth

inclined surfaces

130, 140 of the rear end, respectively, the fourth upper inclined surface 180 is provided with a fourth upper dovetail groove 182 for slidably fitting the third inclined surface guide rail 131 of the rear end therein, the fourth lower inclined surface 181 is provided with a fourth lower dovetail groove 183 for slidably fitting the fourth inclined surface guide rail 141 of the rear end therein, the rear end of the fourth guide block 18 is formed with a fourth rear inclined surface 184 inclined from front to rear and outward, and the fourth rear inclined surface 184 is provided with a fourth rear dovetail groove 185. Two fourth rear stoppers 186 are protruded from the lower end of the fourth rear inclined surface 184.

The first pushing member 20 has two first pushing member inclined planes 23 corresponding to the first and third front

inclined planes

154, 174 on two sides, and two first pushing member guide rails 24 are respectively disposed on the two first pushing member inclined planes 23 for being slidably inserted into the first and third

front dovetail grooves

155, 175, respectively. In addition, two first stopping surfaces 25 are respectively disposed on the upper and lower sides of the first pushing member 20.

The second pushing member 30 has two second pushing member slopes 32 corresponding to the second and fourth

rear slopes

164, 184 on two sides, and the two second pushing member slopes 32 are respectively provided with two second pushing member guide rails 33 for being respectively slidably inserted into the second and fourth

rear dovetail grooves

165, 185. Two second stopping surfaces 34 are respectively disposed on the upper and lower sides of the second pushing member 30.

Please refer to fig. 9-11, which show that when the bolt 40 is tightened, the first and second pushing

members

20, 30 approach each other to synchronously push the first guide block 15, the second guide block 16, the third guide block 17 and the fourth guide block 18, so that the first and second guide blocks 15, 16 and the third and fourth guide blocks 17, 18 slide outwards (left and right) along the two first pushing member inclined planes 23 of the first pushing member 20 and the two second pushing member inclined planes 32 of the second pushing member 30, respectively, and further the first and second guide blocks 15, 16 and the third and fourth guide blocks 17, 18 drive the first and second extending

blocks

11, 12 and the third and fourth extending

blocks

13, 14 to extend transversely between the first and second pushing

members

20, 30 to expand the width.

Referring to fig. 12 to 14, the multi-stage stretching device of the present invention performs a second stage of stretching operation, wherein when the two first stopping surfaces 25 and the two second stopping surfaces 34 are stopped by the two first front stoppers 156, the two third front stoppers 176, the two second rear stoppers 166, and the two fourth rear stoppers 186, respectively, the first and second stretching blocks 11, 12 and the third and fourth stretching blocks 13, 14 between the first and second pushing

members

20, 30 cannot be stretched transversely any more, and at this time, the stretching transversely is stretched to a maximum width (which is a limit width of the first stage of stretching). Then, the bolt 40 is further tightened, so that the first and second extending

blocks

11 and 12 are displaced along the first upper inclined surface 150 and the first lower inclined surface 151 of the first guide block 15 and the second upper inclined surface 160 and the second lower inclined surface 161 of the second guide block 16 to form longitudinal extension, and the third and fourth extending

blocks

13 and 14 are also displaced along the third upper inclined surface 170 and the third lower inclined surface 171 of the third guide block 17 and the fourth upper inclined surface 180 and the fourth lower inclined surface 181 of the fourth guide block 18 to form longitudinal extension, thereby achieving the purpose of adjusting the height to support between an upper bone segment 50 and a lower bone segment 51.

The multi-section stretching device provided by the invention can firstly stretch the first section to transversely stretch to the maximum width, and then stretch the second section to longitudinally stretch to adjust the height, so that no matter how high the upper and lower vertebra joints need to be stretched, the multi-section stretching device can transversely stretch to the maximum width to have a larger contact area, thereby not only having a better supporting effect, but also avoiding the bone joint contact surface from being easily abraded and damaged, and therefore, the single specification is very suitable for bone joint gaps of different body types, different illness states and different diseased parts. Moreover, the two-stage stretching can greatly reduce the operation resistance, thereby increasing the smoothness and saving the labor.

Referring to fig. 15 to fig. 22, a second embodiment of the multi-section expanding device according to the present invention is substantially the same as the first embodiment, and the differences are as follows:

(1) one end of the loop bar 21 of the present embodiment is combined with the first pushing member 20 in a threaded manner.

(2) In this embodiment, the two first stopping surfaces 25 and the two second stopping surfaces 34 of the first embodiment are not blocked by the two first front stoppers 156, the two third front stoppers 176, the two second rear stoppers 166, and the two fourth rear stoppers 186 respectively to serve as the limit of the first stretching, so as to form the condition of performing the second stretching. Instead, in the present embodiment, the first front dovetail groove 155, the first rear dovetail groove 165, the third front dovetail groove 175 and the fourth rear dovetail groove 185 respectively have a limit guide groove 60 on the bottom surface thereof, and one end of the limit guide grooves 60 is open and the other end thereof forms a limit stop surface 61. A convex part 62 is respectively protruded at one end of the two first pushing guide rails 24 and the two second pushing guide rails 33, so that the four convex parts 62 can respectively slide in the four-pole limiting guide groove 60. Referring to fig. 18 and 20, when the bolt 40 is tightened until the four protrusions 62 are respectively stopped by the limit stop surfaces 61 of the four pole limit guide slots 60, the first and second extension blocks 11, 12 and the third and fourth extension blocks 13, 14 between the first and second sliding

blocks

20, 30 cannot be extended transversely any more, and at this time, the first extension block is extended transversely to the maximum width (which is the limit width of the first extension). Thereafter, when the bolt 40 is further tightened, the first and second extending

blocks

11 and 12 will be displaced along the first upper inclined surface 150 and the first lower inclined surface 151 of the first guide block 15 and the second upper inclined surface 160 and the second lower inclined surface 161 of the second guide block 16 to form longitudinal extension, and the third and fourth extending

blocks

13 and 14 will also be displaced along the third upper inclined surface 170 and the third lower inclined surface 171 of the third guide block 17 and the fourth upper inclined surface 180 and the fourth lower inclined surface 181 of the fourth guide block 18 to form longitudinal extension, thereby forming longitudinal extension of the second section.

(3) In this embodiment, a limiting guide groove 70 is respectively disposed on the bottom surfaces of 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 third lower dovetail groove 173, the fourth upper dovetail groove 182 and the fourth lower dovetail groove 183, respectively, and one end of the limiting guide groove 70 is open, and the other end forms a stop surface 71. A locking portion 72 is respectively protruded at one end of each of the two first inclined rails 111, the two second inclined rails 121, the two third inclined rails 131 and the two fourth inclined rails 141, the eight locking portions 72 can respectively slide in the eight limiting guide slots 70, and the locking surface 71 of the eight limiting guide slots 70 can be used to block the eight locking portions 72, so as to prevent the first, second, third and fourth extending

blocks

11, 12, 13 and 14 from separating from the first, second, third and fourth guide blocks 15, 16, 17 and 18 when longitudinally extending (as shown in fig. 21, the limiting action of the first, second, third and fourth extending blocks is explained at the positions of the third inclined rails 131 and the fourth upper dovetail slots 182 in fig. 21, and the limiting actions at other relative positions are the same as those of the first, second, third and fourth inclined rails and therefore are not shown in the drawings).

(4) In this embodiment, two guiding structures 80 are respectively disposed between the first and third extending

blocks

11, 13 and between the second and fourth extending

blocks

12, 14, and the two guiding structures 80 can assist the first and third extending

blocks

11, 13 and the second and fourth extending

blocks

12, 14 to smoothly move synchronously when extending longitudinally. Referring to fig. 22, the two guiding structures 80 include a plurality of guiding holes 81 (two in the embodiment illustrated) and two guiding members 82, which respectively transversely penetrate the first, second, third and fourth extending blocks 11. The inner ends of the guide holes 81 each have a flange 810 with a smaller inner diameter. The two guide members 82 are respectively and correspondingly disposed between the first and third extending

blocks

11, 13 and between the second and fourth extending

blocks

12, 14, each guide member 82 includes two parallel guide rods 820 and a connecting rod 821 connected to the centers of the two guide rods 820, and two ends of the two guide rods 820 of the two guide members 82 are respectively and telescopically inserted into the guide holes 81, two ends of each guide rod 820 respectively have two expansion heads 822 with larger outer diameter and capable of elastically contracting, the expansion heads 822 are beneficial for the guide rods 820 to penetrate into the guide holes 81, and can be blocked by the flange 810 to prevent the guide rods 820 from easily separating from the guide holes 81. Thus, when stretching transversely, the first and third stretching blocks 11, 13 and the second and fourth stretching blocks 12, 14 can smoothly move horizontally by means of the two guiding structures 80, and when stretching longitudinally, the first and third stretching blocks 11, 13 and the second and fourth stretching blocks 12, 14 can smoothly move up and down synchronously by means of the two guiding structures 80.

Referring to fig. 23, a third embodiment of the multi-sectional expanding device according to the present invention is substantially the same as the second embodiment, and the difference is that the two guiding members 82 of the present embodiment only include two guiding rods 820, but not the connecting rod 821. In this embodiment, the two guiding members 82 may also respectively include only one, three or more guiding rods 820, and the number thereof is simply increased or decreased, so that further description is omitted.

Fig. 24 to fig. 26 show a fourth embodiment of the multi-section stretching device of the present invention, which has a structure substantially the same as that of the third embodiment, and the difference is that the first stretching block 11, the second stretching block 12, the third stretching block 13 and the fourth stretching block 14 of the present embodiment respectively include a front block a and a rear block b. The corresponding front block a and the rear block b are slidably connected by corresponding inclined connection surfaces a1, b1, the corresponding inclined connection surfaces a1, b1 are respectively provided with a dovetail groove b2 and a guide rail a2 which are relatively slidably embedded, so that the plurality of front blocks a and the plurality of rear blocks b can be matched with the unevenness of the opposite surfaces of the upper and

lower bone sections

50, 51 to sequentially form two-stage extension when the plurality of front blocks a and the plurality of rear blocks b are longitudinally extended, and further the upper and lower side surfaces of the first extension block 11, the second extension block 12, the third extension block 13 and the fourth extension block 14 can be correspondingly adjusted by matching with the shape, height or angle of the opposite surfaces of the upper and

lower bone sections

50, 51 to obtain good and stable support, and further can be suitable for patients with different conditions.

In the present invention, the first upper dovetail groove 152 and the first inclined rail 111, the first lower dovetail groove 153 and the second inclined rail 121, the second upper dovetail groove 162 and the first inclined rail 111, the second lower dovetail groove 163 and the second inclined rail 121, the third upper dovetail groove 172 and the third inclined rail 131, the third lower dovetail groove 173 and the fourth inclined rail 141, the fourth upper dovetail groove 182 and the third inclined rail 131, the fourth lower dovetail groove and the fourth inclined rail 141, the first and third

front dovetail grooves

155, 175 and the two first stripper rails 24, the second and fourth

rear dovetail grooves

165, 185 and the two second stripper rails 33, and the dovetail groove b2 and rail a2, or other concave-convex buckle set structures that can be slidably fitted correspondingly.

Fig. 27 shows that the multi-stage distraction device of the present invention can also be applied to bones (e.g., vertebral bodies of spine) for fracture recess reduction or repair, but can also be applied to other related parts such as intervertebral, bone-bone or soft tissue (e.g., facial recess reduction or repair) … …, and the material thereof can be different according to the applied position, such as metal, polymer, PE, silicone … …, etc.; the transverse implantation or the longitudinal implantation can achieve the same effects and application range.

Claims

1. A multi-section expanding device, comprising:

2. The multi-sectional distractor of claim 1, wherein: the stretching module comprises a first stretching block, a second stretching block, a third stretching block, a fourth stretching block, a first guide block, a second guide block, a third guide block and a fourth guide block, wherein the second stretching block is positioned at the lower side of the first stretching block, the third stretching block is positioned at the left side of the first stretching block, the fourth stretching block is positioned at the lower side of the third stretching block, the first guide block is slidably embedded at the front end surfaces of the first stretching block and the second stretching block, the second guide block is slidably embedded at the rear end surfaces of the first stretching block and the second stretching block, the first stretching block and the second stretching block can move up and down between the first guide block and the second guide block to form longitudinal stretching, the third guide block is slidably embedded at the front end surfaces of the third stretching block and the fourth stretching block, and the fourth guide block is slidably embedded at the rear end surfaces of the third stretching block and the fourth stretching block, and the third stretching block and the fourth stretching block can move up and down to form longitudinal stretching between the third guide block and the fourth guide block, the first pushing piece is slidably embedded in the front end faces of the first guide block and the third guide block, the second pushing piece is slidably embedded in the rear end faces of the second guide block and the fourth guide block, and the first guide block, the second guide block, the third guide block and the fourth guide block can respectively drive the first stretching block, the second stretching block, the third stretching block and the fourth stretching block to move left and right between the first pushing piece and the second pushing piece to form transverse stretching.

3. The multi-sectional distractor of claim 2, wherein:

4. The multi-sectional distractor of claim 3, wherein: the two first inclined planes are respectively provided with two first inclined plane guide rails, the two second inclined planes are respectively provided with two second inclined plane guide rails, the two third inclined planes are respectively provided with two third inclined plane guide rails, the two fourth inclined planes are respectively provided with two fourth inclined plane guide rails, the first upper inclined plane is provided with a first upper dovetail groove for the first inclined plane guide rail at the front end to be slidably embedded in, the first lower inclined plane is provided with a first lower dovetail groove for the second inclined plane guide rail at the front end to be slidably embedded in, the first front inclined plane is provided with a first front dovetail groove, the second upper inclined plane is provided with a second upper dovetail groove for the first inclined plane guide rail at the rear end to be slidably embedded in, the second lower inclined plane is provided with a second lower dovetail groove for the second inclined plane guide rail at the rear end to be slidably embedded in, the second rear inclined plane is provided with a second rear dovetail groove, the third upper inclined plane is provided with a third upper dovetail groove for the third inclined plane guide rail at the front end to be slidably embedded in, the third lower oblique surface is provided with a third lower dovetail groove for the sliding embedding of the fourth oblique surface guide rail at the front end, the third front oblique surface is provided with a third front dovetail groove, the fourth upper oblique surface is provided with a fourth upper dovetail groove for the sliding embedding of the third oblique surface guide rail at the rear end, the fourth lower oblique surface is provided with a fourth lower dovetail groove for the sliding embedding of the fourth oblique surface guide rail at the rear end, the fourth rear oblique surface is provided with a fourth rear dovetail groove, the two first pushing part oblique surfaces are respectively provided with two first pushing part guide rails for respectively sliding embedding in the first front dovetail groove and the third front dovetail groove, and the two second pushing part oblique surfaces are respectively provided with two second pushing part guide rails for respectively sliding embedding in the second rear dovetail groove and the fourth rear dovetail groove.

5. The multi-sectional distractor of claim 4, wherein: the lower end of the first front inclined plane is convexly provided with two first front stop blocks, the lower end of the second rear inclined plane is convexly provided with two second rear stop blocks, the rear lower end of the third front inclined plane is convexly provided with two third front stop blocks, the lower end of the fourth rear inclined plane is convexly provided with two fourth rear stop blocks, the upper side surface and the lower side surface of the first pushing piece are respectively provided with two first stop surfaces, the upper side surface and the lower side surface of the second pushing piece are respectively provided with two second stop surfaces, and the two first stop surfaces and the two second stop surfaces can be respectively stopped by the two first front stop blocks, the two third front stop blocks, the two second rear stop blocks and the two fourth rear stop blocks so as to prevent the transverse stretching from continuing and further achieve the limit width of the first section of stretching.

6. The multi-sectional distractor of claim 2, wherein: a sleeve rod is convexly extended from the rear side of the first pushing piece, and the screw hole is arranged in the sleeve rod.

7. The multi-sectional distractor of claim 6, wherein: one end of the loop bar is combined on the first pushing piece in a threaded mode.

8. The multi-sectional distractor of claim 2, wherein: the bottom surface of the first stretching block is provided with a plurality of first guide blocks and a plurality of first guide grooves which are staggered with each other and are trapezoidal, the top surface of the second stretching block is provided with a plurality of second guide grooves and a plurality of second guide blocks which can be correspondingly upwards and downwards embedded with the plurality of first guide blocks and the plurality of first guide grooves, the bottom surface of the third stretching block is provided with a plurality of third guide blocks and a plurality of third guide grooves which are staggered with each other and are trapezoidal, and the top surface of the fourth stretching block is provided with a plurality of fourth guide grooves and a plurality of fourth guide blocks which can be correspondingly upwards and downwards embedded with the plurality of third guide blocks and the plurality of third guide grooves.

9. The multi-sectional distractor of claim 4, wherein: the first front dovetail groove, the second rear dovetail groove, the third front dovetail groove and the fourth rear dovetail groove are respectively provided with a limit guide groove on the groove bottom surface, one end of each limit guide groove is in an opening shape, the other end of each limit guide groove forms a limit stop surface, one end of each of the two first pushing guide rails and one end of each of the two second pushing guide rails are respectively provided with a convex part in a protruding mode, the four convex parts can slide in the four limit guide grooves respectively, the four convex parts can be respectively stopped by the limit stop surfaces of the four limit guide grooves, and therefore transverse stretching cannot be continued, and the limit width of the first section stretching is further achieved.

10. The multi-sectional expanding apparatus of 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, 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 limiting guide groove on the groove bottom surface, one end of the limiting guide groove is open, the other end of the limiting guide groove forms a clamping surface, one end of each of 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 is respectively provided with a clamping part in a protruding mode, the eight clamping parts can respectively slide in the eight limiting guide grooves, and the clamping surfaces of the eight limiting guide grooves can block the eight clamping parts, so that the first, second, third and fourth extension blocks can not be easily separated from the first, second, third and fourth guide blocks when the edges are extended.

11. The multi-sectional distractor of claim 2, wherein: the two guide structures are respectively arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, and can assist the first stretching block, the third stretching block, the second stretching block and the fourth stretching block to smoothly and synchronously displace when stretching.

12. The multi-sectional distractor of claim 11, wherein: the two guide structures comprise a plurality of guide holes and two guide members, wherein the guide holes respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide members are respectively and correspondingly arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, each guide member comprises at least one guide rod, and two ends of each guide rod are respectively and telescopically inserted into the corresponding two guide holes.

13. The multi-sectional distractor of claim 11, wherein: the two guide structures comprise a plurality of guide holes and two guide members, wherein the guide holes respectively transversely penetrate through the first stretching block, the second stretching block, the third stretching block and the fourth stretching block, the two guide members are respectively and correspondingly arranged between the first stretching block and the third stretching block and between the second stretching block and the fourth stretching block, each guide member comprises two parallel guide rods and a connecting rod connected with the centers of the two guide rods, and two ends of the two guide rods of the two guide members are respectively telescopically inserted into the corresponding guide holes.

14. The multi-sectional distractor of claim 2, wherein: the first stretching block, the second stretching block, the third stretching block and the fourth stretching block respectively comprise a front block and a rear block, and the corresponding front block and the rear block are in sliding connection through corresponding scarfed surfaces, so that the plurality of front blocks and the plurality of rear blocks can be matched with unevenness of opposite surfaces of the upper bone section and the lower bone section to sequentially form longitudinal two-stage stretching.

15. The multi-sectional distractor of claim 14, wherein: the two corresponding oblique joint surfaces are respectively provided with a dovetail groove and a guide rail which are oppositely and slidably embedded.