阅读说明：本技术 一种重度腰椎滑脱复位固定装置 (Severe lumbar spondylolisthesis fixing device that resets ) 是由 胡宇航 于占革 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种重度腰椎滑脱复位固定装置,涉及腰椎滑脱复位固定装置技术领域。本发明包括并排设置的两个固定单元,每个固定单元包括连接棒本体和至少三个椎弓根钉,连接棒本体安装在椎弓根钉上,固定单元还包括连接器,连接器贯穿开设有第一通孔和第二通孔,连接器还开设有与第一通孔相互连通的第一螺纹孔、与第二通孔相互连通的第二螺纹孔,第一螺纹孔和第二螺纹孔内配设有固定螺钉,连接棒本体包括贯穿第一通孔的第一连接棒和贯穿第二通孔的第二连接棒。(The invention discloses a resetting and fixing device for severe lumbar spondylolisthesis, and relates to the technical field of resetting and fixing devices for lumbar spondylolisthesis. The vertebral pedicle fixing device comprises two fixing units arranged side by side, each fixing unit comprises a connecting rod body and at least three vertebral pedicle screws, the connecting rod body is arranged on each vertebral pedicle screw, each fixing unit further comprises a connector, each connector is provided with a first through hole and a second through hole in a penetrating mode, each connector is further provided with a first threaded hole communicated with the first through hole and a second threaded hole communicated with the second through hole, fixing screws are arranged in the first threaded holes and the second threaded holes in a matching mode, and each connecting rod body comprises a first connecting rod penetrating through the first through hole and a second connecting rod penetrating through the second through hole.)

1. The utility model provides a heavy lumbar spondylolisthesis fixing device that resets, includes two fixed units that set up side by side, and every fixed unit includes connective bar body and at least three pedicle screw, and the connective bar body is installed on pedicle screw, its characterized in that: the fixing unit further comprises a connector, the connector is provided with a first through hole and a second through hole in a penetrating mode, the connector is further provided with a first threaded hole communicated with the first through hole and a second threaded hole communicated with the second through hole, fixing screws are arranged in the first threaded hole and the second threaded hole in a matching mode, and the connecting rod body comprises a first connecting rod penetrating through the first through hole and a second connecting rod penetrating through the second through hole.

2. The reduction fixation device for severe lumbar spondylolisthesis of claim 1, wherein: the supporting assembly comprises a pair of pliers and a supporting unit, the pliers comprise a first pliers body and a second pliers body, a pin shaft penetrates through the lower ends of the first pliers body and the second pliers body, the two ends of the supporting unit are hinged to the inner side wall of the first pliers body and the inner side wall of the second pliers body, and the supporting unit is located above the pin shaft.

3. The reduction fixation device for severe lumbar spondylolisthesis of claim 2, wherein: and the lower ends of the first clamp body and the second clamp body are provided with opening plates.

4. The reduction fixation device for severe lumbar spondylolisthesis of claim 2, wherein: and positioning rings convenient to hold are arranged at the upper ends of the first clamp body and the second clamp body.

5. The reduction fixation device for severe lumbar spondylolisthesis of claim 2, wherein: the supporting unit comprises a guide cylinder, a guide post and a sleeve; the one end and the first pincers body interconnect of guide cylinder, the one end and the second pincers body interconnect of guide post, the other end of guide post is located the guide cylinder, the sleeve includes location section and locking section, the location section rotates with the guide cylinder to be connected, the internal thread has been seted up to the locking section, the outer wall of guide cylinder is seted up the external screw thread with internal thread looks adaptation.

6. The reduction fixation device for severe lumbar spondylolisthesis of claim 5, wherein: the internal diameter of location section is greater than the internal diameter of locking section, the inner wall of location section is provided with annular stopper, the outer wall of guide cylinder is provided with the spacing groove with stopper mutual adaptation.

7. The reduction fixation device for severe lumbar spondylolisthesis of claim 5, wherein: the first clamp body and the second clamp body sleeve are respectively sleeved with a first connecting block and a second connecting block, the guide cylinder is hinged to the first connecting block, and the guide column is hinged to the second connecting block.

8. The reduction fixation device for severe lumbar spondylolisthesis of claim 5, wherein: the lateral wall of guide cylinder has seted up logical groove along the axial, it runs through the guide cylinder outer wall along the thickness direction to lead to the groove, the outside that leads to the groove is provided with the scale, the outer wall of guide post is provided with the pointer, the pointer runs through and aligns with the scale behind the logical groove.

Technical Field

The invention relates to the technical field of lumbar spondylolisthesis reduction fixing devices, in particular to a severe lumbar spondylolisthesis reduction fixing device.

Background

According to the Meyerding method, the vertebral body slides anteriorly beyond the sagittal diameter 2/4 of the inferior vertebral body, i.e., severe lumbar spondylolisthesis, including (iii, iv lumbar spondylolisthesis). The pathophysiology basis is that the lumbar spondylolisthesis compresses bilateral outlet roots, walking roots and cauda equina, and the root symptoms and spinal stenosis symptoms mostly exist at the same time. Conservative treatment for patients with severe slippage is often ineffective and requires surgical treatment. The key of the operation treatment lies in removing the nerve compression, well solving the problems of herniation of intervertebral disc, hypertrophic ligament and the like, simultaneously correcting the deformed spine and recovering the stability and the intervertebral height of the vertebral body.

The research shows that the surgical reduction can improve the vertebral column vector unbalance of the patients with severe spondylolisthesis and correct the lumbar kyphosis. Especially for young patients, the recovery of the normal sequence of the spine can avoid abnormal stress of the spine for a long time in the future, and has great significance for preventing internal fixation failure, adjacent vertebra diseases and the like.

Taking the true slippage of L5-S1 as an example, in the prior art, six screws are generally divided into two rows for lifting and resetting, and S1, L5 and L4 are respectively fixed; the lifting capacity is much greater than the 4 screws used to fix only L5 and S1, but if the patient L4-5 is a normal disc, one movement unit of the lumbar spine is lost.

Therefore, the device for resetting and fixing the severe lumbar spondylolisthesis ensures the lifting force of the pedicle screws after being fixed to the cone, and can disassemble redundant pedicle screws after the resetting is finished, thereby ensuring that the normal motion unit can normally move.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a resetting and fixing device for severe lumbar spondylolisthesis, which ensures the lifting force after a pedicle screw is fixed to a cone, and simultaneously can disassemble redundant pedicle screws after the resetting is finished, thereby ensuring that a normal motion unit can normally move.

The invention specifically adopts the following technical scheme:

the invention discloses a resetting and fixing device for severe lumbar spondylolisthesis, which comprises two fixing units arranged side by side, wherein each fixing unit comprises a connecting rod body and at least three pedicle screws, the connecting rod body is arranged on the pedicle screws, the fixing units further comprise connectors, the connectors are provided with first through holes and second through holes in a penetrating manner, the connectors are further provided with first threaded holes communicated with the first through holes and second threaded holes communicated with the second through holes, fixing screws are arranged in the first threaded holes and the second threaded holes in a matching manner, and the connecting rod body comprises a first connecting rod penetrating through the first through holes and a second connecting rod penetrating through the second through holes.

The present invention is further preferred: the supporting assembly comprises a pair of pliers and a supporting unit, the pliers comprise a first pliers body and a second pliers body, the lower ends of the first pliers body and the second pliers body penetrate through a pin shaft, the two ends of the supporting unit are connected with the inner side wall of the first pliers body and the inner side wall of the second pliers body, and the supporting unit is located above the pin shaft.

The key point of the slippage resetting is that the distraction is carried out through the distraction component and the pedicle screw is matched with the lifting of the connecting column, the distraction and the lifting are respectively determined by the compression resistance of the end plate stressed by the distraction plate and the holding force of the pedicle screw inserted into a bone, the design can reduce the pressure and improve the distraction effect, and the holding force of the pedicle screw is increased.

The present invention is further preferred: the lower ends of the first clamp body and the second clamp body are provided with an opening plate.

The present invention is further preferred: the upper ends of the first clamp body and the second clamp body are provided with positioning rings convenient to hold.

The present invention is further preferred: the supporting unit comprises a guide cylinder, a guide post and a sleeve; the one end and the first pincers body interconnect of guide cylinder, the one end and the second pincers body interconnect of guide post, the other end of guide post is located the guide cylinder, and the sleeve includes location section and locking section, and the location section rotates with the guide cylinder to be connected, and the internal thread has been seted up to the locking section, and the external screw thread with the mutual adaptation of internal thread has been seted up to the outer wall of guide cylinder.

The present invention is further preferred: the internal diameter of location section is greater than the internal diameter of locking section, and the inner wall of location section is provided with annular stopper, and the outer wall of guide cylinder is provided with the spacing groove with stopper mutual adaptation.

The present invention is further preferred: the first clamp body and the second clamp body sleeve are respectively sleeved with a first connecting block and a second connecting block, the guide cylinder is hinged to the first connecting block, and the guide column is hinged to the second connecting block.

The present invention is further preferred: the lateral wall of guide cylinder has seted up logical groove along the axial, leads to the groove and runs through the guide cylinder outer wall along thickness direction, and the outside that leads to the groove is provided with the scale, and the outer wall of guide post is provided with the pointer, and the pointer aligns with the scale after running through logical groove.

The invention has the beneficial effects that:

1. the fixation after the severe lumbar spondylolisthesis is fixed with the vertebra through the fixing unit. The fixing unit comprises at least three pedicle screws, the first connecting rod is arranged on the two pedicle screws, the second connecting rod is arranged on the third pedicle screw, and the first connecting rod and the second connecting rod are connected through the connector to keep the integrity as a whole. After the lumbar vertebra is restored, the second connecting rod is separated from the first connecting rod by detaching the connector, and then the pedicle screws are detached from the normal vertebrae to ensure the normal use of the normal intervertebral disc. Effectively ensures that the lifting force in the process of reduction is large enough, and after the reduction is finished, the pedicle screw of the normal intervertebral disc is dismantled without losing a normal movement unit of the lumbar.

2. The two strutting units are positioned at the outer sides of the two fixing units, the lower ends of the first forceps body and the second forceps body of the fixing units are positioned between the two adjacent transverse processes, and the two vertebras are strutting by the strutting units. After restoration, firstly removing the distraction unit on one side, keeping the distraction unit on the other side in a distraction state to maintain the height of intervertebral space, implanting the intervertebral fusion cage with the same height on one side with the distraction unit removed, and locking the fixing unit on the side; the contralateral fixation unit is released, at which time the intervertebral space height can be maintained by the already implanted intervertebral cage and the locked fixation unit, at which time the lateral intervertebral cage is implanted and the fixation unit is locked. After the complete locking and the good perspective of the position of the built-in object by the C arm, the connector is removed, and the vertebral pedicle nail and the second connecting rod which are fixed with the normal intervertebral disc are used for restoring the lumbar spondylolisthesis and finishing the internal fixation.

3. The upper end and the lower end of the first forceps body and the second forceps body are respectively provided with the opening plate and the positioning ring, so that the opening force can be conveniently applied to the forceps, and the using effect of the forceps on opening the intervertebral is improved through the opening plates.

4. Through setting up the supporting element, the guide cylinder is hollow structure, and the guide cylinder and the guide post that first pincers body and second pincers body are connected respectively mutually support, are equipped with the sleeve at guide cylinder and guide post overcoat, can maintain the state that first pincers body and second pincers body strut, guarantee that the open angle of pliers can not change at will. The sleeve is connected with the guide cylinder in a rotating mode, the other end of the sleeve is connected with the guide column in a threaded mode, the sleeve can move relative to the guide column in advance by rotating the sleeve, the sleeve and the guide cylinder cannot move relative to each other, the relative distance between the guide column and the guide cylinder is adjustable, and therefore the opening angle of the first clamp body and the opening angle of the second clamp body are adjusted. The guide cylinder and the guide column are hinged with the first clamp body and the second clamp body through the first connecting block and the second connecting block respectively, so that the guide column can move relatively in the guide cylinder in the process that the first clamp body and the second clamp body do arc motion around the pin shaft.

5. Through seting up logical groove at the guide cylinder, the lateral wall that leads to the groove sets up the scale, and convenience of customers knows the open degree of pliers at the in-process that uses, avoids directly opening too big angle. Meanwhile, the opening degree of the opening components on the left side and the right side is consistent by referring to the scales, and the use precision of a user is improved.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

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

FIG. 2 is a top schematic view of the connector shown in FIG. 1;

FIG. 3 is a schematic view of the distractor assembly;

FIG. 4 is an enlarged view of the structure at A in FIG. 3;

FIG. 5 is a schematic view of the sleeve of FIG. 4;

FIG. 6 is a schematic structural view of the guide cylinder;

in the figure, 1-connecting rod body, 101-first connecting rod, 102-second connecting rod, 2-pedicle screw, 3-connector, 4-first through hole, 401-first threaded hole, 5-second through hole, 501-second threaded hole, 6-fixing screw, 7-spreading component, 701-first clamp body, 7011-first connecting block, 702-second clamp body, 7021-second connecting block, 703-pin shaft, 704-positioning ring, 705-spreading plate, 8-supporting unit, 801-guide cylinder, 8011-limiting groove, 8012-through groove, 8013-scale, 802-sleeve, 8021-positioning section, 8022-locking section, 803-guide column, 8031-pointer and 9-limiting block.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.