CN209984280U

CN209984280U - Spine fixer for orthopedics department

Info

Publication number: CN209984280U
Application number: CN201920203578.5U
Authority: CN
Inventors: 陆廷盛; 姚书眈; 欧阳北平
Original assignee: Guizhou Osteological Hospital
Current assignee: Guizhou Osteological Hospital; Guizhou Orthopedics Hospital
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2020-01-24
Anticipated expiration: 2029-02-15

Abstract

The utility model relates to an orthopedics backbone fixer, including the arch connecting rod at least, the arch connecting rod is at least including being arcuate first connecting portion and second connecting portion, and the junction of first connecting portion and second connecting portion is provided with the connector that is flexible at the crooked direction of backbone physiology. The utility model provides an orthopedics backbone fixer passes through arcuate first connecting portion and second connecting portion, can increase the load and share under the prerequisite that does not sacrifice the fixed stability of backbone, reduces stress shielding and stress concentration, has reduced phenomenons such as disconnected nail and disconnected stick, also can reduce the compensation motion of neighbouring segment section to alleviate intervertebral disc, the facet joint degenerative change who closes on the segment section.

Description

Spine fixer for orthopedics department

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an orthopedics backbone fixer.

Background

At present, the prior various spinal fixators have the following defects: 1. the length of the existing orthopedic spine fixator is not adjustable, so that hospitals must prepare spine fixators with different sizes, material resources and financial resources are wasted, and the treatment cost of patients is increased; 2. the spine is fixed by the bolts with unchangeable angles, so the bolts cannot be well matched with the pathological vertebral bodies, or the vertebral bodies of the spine are fixed by the universal pedicle screws, and although the universal pedicle screws can change angles to a certain degree, the universal pedicle screws are bent or even broken due to stress concentration and other reasons in clinical operations, so the operation difficulty is increased; 3. the connectors currently used for connecting two universal pedicle screws are straight, resulting in high notches in the spinal fixation device and being disadvantageous to install in specific practical operations.

Chinese patent (publication No. CN207679516U) discloses an orthopedic spine fixator, which comprises an arched connecting rod, universal pedicle screws and a limiting fine adjustment mechanism; the arch connecting rod includes arc and straight-bar, arc and straight-bar are the integral type and connect, two straight-bars of arch connecting rod respectively through a spacing fine-tuning and universal pedicle of vertebral arch screw connection, spacing fine-tuning includes the stop collar, set nut and connector, run through and have the internal screw thread through-hole around the stop collar is seted up, the straight-bar is connected with the stop collar with the screw thread mode, set nut is on locating the straight-bar with threaded connection's mode cover, the other end threaded connection of stop collar has the connector that has the external screw thread, the connector is connected with universal pedicle of vertebral arch screw, universal pedicle of vertebral arch screw is mutually perpendicular with the straight. However, the orthopedic spine fixator provided by the patent adopts the arched connecting rods to reconstruct and stabilize the vertebral canal, and the rigidity of the arched connecting rods can change the motion mechanics of the spine structure to a certain degree, so that the mobility of adjacent segments of the spine can be increased to a certain extent, and stress is inevitably concentrated on the fixator or adjacent segments of intervertebral discs or corresponding articular processes up and down, thereby further aggravating the degeneration of the spine. In addition, the universal pedicle screws and the arched connecting rods may be broken due to excessive stress concentration on the fixator, and the fixator provided by the patent is not fixed by the arched connecting rods on two sides of the spine, so that the stability of the spine cannot be guaranteed under the condition that the stress is concentrated on the fixator.

SUMMERY OF THE UTILITY MODEL

The utility model provides an orthopedic spinal column fixer, which comprises at least an arch connecting rod. The arched connecting rod at least comprises a first connecting part and a second connecting part which are arched. A connector which is flexible in the physiological bending direction of the spine is arranged at the connection part of the first connecting part and the second connecting part.

According to a preferred embodiment, the connector comprises at least a shaft and a groove at least partially enveloping the shaft. The rotating shaft is connected with the first connecting part. The groove is connected with the second connecting portion. The rotating shaft is nested in the groove in a pivotable mode.

According to a preferred embodiment, the side of the rotating shaft covered by the groove is provided with a plurality of circular slotted holes at intervals along the axial direction of the rotating shaft. The inner side of the groove, which is in contact with the rotating shaft, is provided with a plurality of through holes which are matched with the circular slotted holes in position and have the same diameter. After the rotating shaft is nested in the groove, the groove hole and the through hole are arranged in a mutually communicated mode.

According to a preferred embodiment, the connector is further provided with an elastic inner core. The elastic inner core is abutted against the inner walls of the slotted hole and the through hole in a mode of penetrating through the slotted hole and the through hole.

According to a preferred embodiment, the fixator further comprises a universal pedicle screw and a position-limiting fine adjustment mechanism. The two ends of the first connecting part and the second connecting part are respectively connected with the universal pedicle screws through the limiting fine adjustment mechanism. And the two ends of the first connecting part and the second connecting part are connected with the limiting fine adjustment mechanism in a detachable mode.

According to a preferred embodiment, the limiting fine adjustment mechanism at least comprises a limiting sleeve, a positioning nut and a connector. The limiting sleeve is provided with a sleeve hole which penetrates through the limiting sleeve from front to back. The two ends of the first connecting part and the second connecting part are connected with the limiting sleeve in a mode of penetrating through the sleeve hole. The positioning nut is sleeved on the two ends of the first connecting part and the second connecting part and abutted against the end part of the limiting sleeve in a mode that the two ends of the first connecting part and the second connecting part can be fixed in the limiting sleeve in a limiting mode.

According to a preferred embodiment, the other end of the limiting sleeve, which is opposite to the positioning nut, is detachably connected with the connector.

According to a preferred embodiment, the universal pedicle screw comprises at least a screw body, a head and a nut. The nail head is a U-shaped groove. The other end of the connector, which is opposite to the limiting sleeve, is pressed into the nail head.

According to a preferred embodiment, the inner side wall of the U-shaped groove of the stud is provided with an internal thread matching the nut for fastening the connector.

According to a preferred embodiment, the tip of the screw body is in the shape of a spherical crown. The screw body is sleeved in the nail head in a mode of penetrating through the bottom of the U-shaped groove of the nail head and being connected with the U-shaped groove in the nail head in a spherical crown shape.

The beneficial effects of the utility model are that following one or more:

1. the utility model provides an orthopedics backbone fixer can increase load sharing through bow-shaped first connecting portion and second connecting portion under the prerequisite that does not sacrifice the fixed stability of backbone, reduces stress shielding and stress concentration, has reduced phenomenons such as disconnected nail and disconnected stick, also can reduce the compensation motion of neighbouring segment section to alleviate intervertebral disc, the facet joint degenerative change that closes on the segment section;

2. the utility model provides an orthopedics backbone fixer passes through the connector, can make first connecting portion and second connecting portion revolute the axle and rotate relatively to the fixer is flexible in the normal crooked curved direction of backbone, has realized the dynamic stability of fixer effectively and has fixed, and then can change the motion mode of the centrum segment section that the fixer relates, keeps or rebuilds the function of tissue again.

Drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention; and

fig. 2 is a side view of the structure shown in fig. 1.

List of reference numerals

1: the arch connecting rod 2: the connector 3: universal pedicle screw

4: limiting fine adjustment mechanism 11: first connection portion 12: second connecting part

21: rotating shaft 22: groove 23: elastic inner core

31: the screw body 32: the head 33: nut cap

41: the limiting sleeve 42: positioning nut 43: connecting head

211: groove holes 221: through hole 411: trepan boring

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides an orthopedic spinal column fixator, which at least comprises an arch connecting rod 1. The arched connecting rod 1 includes at least a first connecting portion 11 and a second connecting portion 12 in an arched shape. A connector 2 that is flexible in the physiological bending direction of the spine is provided at the connection of the first connection portion 11 and the second connection portion 12. Preferably, the first connection portion 11 and the second connection portion 12 may be formed of an elastic connection rod having a curved shape or an arcuate shape, as shown in fig. 1. The first connecting portion 11 and the second connecting portion 12 can be made of materials such as nickel titanium memory alloy and the like. Preferably, the first connecting portion 11 and the second connecting portion 12 are arched to increase load sharing, reduce stress shielding and stress concentration, reduce phenomena such as screw breaking and rod breaking, and reduce compensatory movement of adjacent segments on the premise of not sacrificing the fixation stability of the spine, thereby reducing degenerative disc and facet joints of the adjacent segments. Preferably, the connector 2 is structured as shown in fig. 1 and 2, and the elastic inner core 23 in the connector 2 can enable the first connecting part 11 and the second connecting part 12 to relatively rotate around the rotating shaft 21, so that the fixator is flexible in the bending direction of the normal bending curve of the spine, dynamic and stable fixation of the fixator is effectively realized, and the motion mode of the vertebral body segment involved in the fixator can be changed, and the function of tissues can be maintained or reestablished.

According to a preferred embodiment, the connector 2 comprises at least a shaft 21 and a groove 22 at least partially enveloping the shaft 21. The rotation shaft 21 is connected to the first connection portion 11. The groove 22 is connected to the second connecting portion 12. The shaft 21 is pivotally nested in the groove 22. Preferably, as shown in fig. 2, the shaft 21 is partially wrapped by the groove 22. The first connecting portion 11 is hinged to the second connecting portion 12 by pivoting the shaft 21 in the groove 22. Preferably, the shaft 21 and the groove 22 are made of titanium alloy material. The connector 2 is placed under the spinous process of the spine to avoid the connector 2 protruding and rubbing against the skin.

According to a preferred embodiment, the side of the shaft 21 covered by the grooves 22 is provided with a plurality of circular slots 211 arranged at intervals in the axial direction of the shaft 21. The inner side of the groove 22 contacting with the rotating shaft 21 is provided with a plurality of through holes 221 which are matched with the circular slotted holes 211 in position and have the same diameter. After the rotating shaft 21 is nested in the groove 22, the slot hole 211 and the through hole 221 are arranged in a way of communicating with each other. Preferably, the slot 211 is as shown in fig. 2. The slot 211 is a hole with a certain depth on the rotation axis. Preferably, the slot holes 211 and the corresponding through holes 221 are disposed in a direction perpendicular to the first connection portion 11 and the second connection portion 12, as shown in fig. 2. The slot 211 and the corresponding through hole 221 can also be arranged in a direction parallel to the first connection portion 11 and the second connection portion 12, so that the connector 2 is rigid in the compression direction of the spinal column, while remaining flexible in the normal bending direction of the spinal column.

According to a preferred embodiment, the connector 2 is also provided with an elastic core 23. The elastic core 23 is abutted against the inner walls of the slot hole 211 and the through hole 221 in such a manner as to penetrate the slot hole 211 and the through hole 221. Preferably, the elastic core 23 may be an elastic metal rod made of memory alloy such as gold-cadmium alloy, titanium-nickel alloy, copper-zinc-aluminum alloy, copper-aluminum-nickel alloy, iron-manganese-silicon alloy, and the like.

According to a preferred embodiment, the fixator further comprises a universal pedicle screw 3 and a position limiting fine adjustment mechanism 4. The two ends of the first connecting part 11 and the second connecting part 12 are respectively connected with the universal pedicle screws 3 through the limiting fine adjustment mechanism 4. The two ends of the first connecting part 11 and the second connecting part 12 are detachably connected with the limiting fine adjustment mechanism 4. Preferably, the detachable connection may be a threaded connection. Preferably, the first connecting portion 11 and the second connecting portion 12 are at least partially provided with external threads on both ends.

According to a preferred embodiment, the fine adjustment mechanism 4 comprises at least a stop collar 41, a positioning nut 42 and a connector 43. The position-limiting sleeve 41 is provided with a sleeve hole 411 which penetrates through the front and the back. Both ends of the first connecting portion 11 and the second connecting portion 12 are connected to the stopper 41 so as to penetrate through the housing hole 411. The positioning nuts 42 are sleeved on the two ends of the first connecting portion 11 and the second connecting portion 12 and abut against the end portions of the limiting sleeve 41 in a manner that the two ends of the first connecting portion 11 and the second connecting portion 12 can be limited and fixed in the limiting sleeve 41.

According to a preferred embodiment, the other end of the stop collar 41 opposite the positioning nut 42 is removably connected to the connection head 43.

According to a preferred embodiment, the universal pedicle screw 3 comprises at least a screw body 31, a head 32 and a nut 33. The head 32 is a U-shaped groove. The other end of the connecting head 43 opposite to the limiting sleeve 41 is pressed into the nail head 32.

According to a preferred embodiment, the inside wall of the U-shaped recess of the stud 32 is provided with an internal thread matching the nut 33 for fastening the attached head 43. Preferably, the connectors 33 on both ends of the first connecting portion 11 and the second connecting portion 12 are pressed into the U-shaped groove of the stud 32, as shown in fig. 1 and 2. Preferably, a nut 33 is screwed into the stud 32, thereby compressing the fixed connector 33.

According to a preferred embodiment, the tip of the screw body 31 is of spherical crown shape. The screw body 31 is sleeved in the nail head 32 in a mode of penetrating through the bottom of the U-shaped groove of the nail head 32 and being connected with the U-shaped groove in the nail head 32 in a spherical crown shape. Preferably, the spherical crown connection mode can provide a multi-angle nailing direction for the screw body 31, so that an optimal fixed angle can be selected according to the specific situation of a patient, and the success rate of the operation is improved.

For ease of understanding, the working principle of the present invention is discussed.

Will according to patient's the backbone condition at the doctor the utility model discloses fix on the backbone after, the X-shaped bearing structure that arcuate first connecting portion 11 and second connecting portion 12 are constituteed not only has stronger stable fixity, can also increase the load and share, reduces stress and shelters from and stress concentration, has reduced phenomenons such as disconnected nail and disconnected stick, also can reduce the compensation motion of neighbouring segment section to alleviate intervertebral disc, the facet joint degenerative change that closes on the segment section. A plurality of elasticity inner core 23 can be under the prerequisite that does not sacrifice spinal column fixed stability in connector 2, makes the utility model discloses the normal bending curve of early backbone is flexible in the bending direction, has realized effectively the utility model discloses a dynamic stability is fixed, and then can change the utility model relates to a motion pattern of centrum segment section keeps or reestablishes the function of tissue.

It should be noted that the above-mentioned embodiments are exemplary, and those skilled in the art can devise various solutions in light of the present disclosure, which are also within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present specification and drawings are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. The utility model provides an orthopedics backbone fixer, includes arch connecting rod (1) at least, characterized in that, arch connecting rod (1) is including being arcuate first connecting portion (11) and second connecting portion (12) at least to be provided with in the junction of first connecting portion (11) and second connecting portion (12) and be flexible connector (2) in backbone physiology crooked direction.

2. The holder according to claim 1, characterized in that the connector (2) comprises at least a shaft (21) and a groove (22) at least partially enveloping the shaft (21), wherein,

the rotating shaft (21) is connected with the first connecting part (11), the groove (22) is connected with the second connecting part (12), and the rotating shaft (21) is nested in the groove (22) in a pivoting manner.

3. The holder according to claim 2, wherein one side of the shaft (21) covered by the groove (22) is provided with a plurality of circular slots (211) arranged at intervals in the axial direction of the shaft (21), and the inner side of the groove (22) contacting the shaft (21) is provided with a plurality of through holes (221) having the same diameter and matching the positions of the plurality of circular slots (211), wherein,

after the rotating shaft (21) is nested in the groove (22), the slotted hole (211) and the through hole (221) are arranged in a mutually communicated mode.

4. A fixture according to claim 3, wherein said connector (2) is further provided with an elastic core (23), said elastic core (23) being abutted against the inner walls of said slot (211) and said through hole (221) in such a manner as to pass through said slot (211) and said through hole (221).

5. The fixator according to claim 1, further comprising a universal pedicle screw (3) and a limiting fine adjustment mechanism (4), wherein both ends of the first connection portion (11) and the second connection portion (12) are connected with the universal pedicle screw (3) through the limiting fine adjustment mechanism (4), respectively,

the two ends of the first connecting part (11) and the second connecting part (12) are connected with the limiting fine adjustment mechanism (4) in a detachable mode.

6. The holder according to claim 5, characterized in that the fine adjustment mechanism (4) comprises at least a stop collar (41), a positioning nut (42) and a coupling head (43), wherein,

the stop collar (41) is provided with a sleeve hole (411) which penetrates through the front and the back, the two ends of the first connecting part (11) and the second connecting part (12) are connected with the stop collar (41) in a manner of penetrating through the sleeve hole (411), and the positioning nut (42) can be used for limiting and fixing the two ends of the first connecting part (11) and the second connecting part (12) in the stop collar (41) in a manner of sleeving the two ends of the first connecting part (11) and the second connecting part (12) with the end parts of the stop collar (41) to abut against each other.

7. The fastener according to claim 6, characterized in that the other end of the stop collar (41) opposite to the positioning nut (42) is detachably connected to the connecting head (43).

8. The fixator according to claim 6, wherein the universal pedicle screw (3) comprises at least a screw body (31), a head (32) and a nut (33), wherein,

the nail head (32) is a U-shaped groove, and the other end of the connector (43) opposite to the limiting sleeve (41) is pressed into the nail head (32).

9. A fastener according to claim 8, wherein the U-shaped recess in the head (32) is provided with internal screw threads on the inside wall thereof for engagement with a complementary screw cap (33) of the coupling head (43).

10. The fastener of claim 8, wherein the top of the screw body (31) is in the shape of a spherical crown, and the screw body (31) is sleeved in the stud (32) in a manner of penetrating through the bottom of the U-shaped groove of the stud (32) and being in spherical crown connection with the U-shaped groove in the stud (32).