Lumbar spondylolisthesis distraction and reduction lever

Abstract

The present invention discloses a lumbar spondylolisthesis distraction and reduction pry bar. The pry bar comprises a handle, a pry bar and a pry plate. The lower part of the pry bar is provided with a fulcrum baffle plate. The top end of the pry bar is fixed with a handle. The working surface of the pry plate is fixed with anti-skid teeth. A connecting block is fixed on the connecting surface of the pry plate. The connecting block is hinged to the bottom end of the pry bar through a rotating shaft. The lumbar spondylolisthesis distraction and reduction pry bar also comprises a baffle positioning assembly and a baffle locking assembly. The cross-section of the pry plate is a flat rectangle. The bottom cross-sectional area of ​​the pry plate gradually decreases from the outside to the inside to form a blunt insertion head. The present invention is easy to use and utilizes the principle of lever to loosen and reduce the slipped vertebral body, thereby reducing the reliance on the pulling force of the pedicle screw during the pulling and reduction process.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a lumbar spondylolisthesis distraction and reduction pry bar used for distraction, release and auxiliary reduction of a slipped vertebral body in a lumbar spondylolisthesis reduction operation. Background Art

[0002] Lumbar spondylolisthesis is an abnormal connection between the bony structures of the lumbar vertebrae. The upper vertebrae slip forward, causing lumbar spinal stenosis and nerve compression, which leads to low back pain, lower limb pain, numbness and other symptoms in patients, often causing great pain to patients and even lower limb dysfunction. The main treatment method is lumbar spondylolisthesis reduction and internal fixation. During the operation, the intervertebral space of the slipped vertebra is first opened and loosened, and then the slipped vertebra is lifted and reset through the pedicle screw internal fixation system to restore spinal stability and decompress the nerves. However, the current clinical reduction of the slipped vertebra mostly relies on the lifting effect of the pedicle screw. Since lumbar spondylolisthesis often occurs in elderly people with osteoporosis, the reduction effect of relying solely on pedicle lifting is limited, reduction is difficult, and pedicle screws are prone to loosening during the lifting process, leading to surgical failure.

[0003] In view of the difficulty of insufficient lifting force of pedicle screws during reduction, Chinese invention CN106618704A discloses a lumbar spondylolisthesis reduction device and its use method, including a handle, a connecting rod and a paddle, the paddle is a flat structure and the paddle surface is provided with evenly distributed anti-skid particles and protrusions, one end of the connecting rod is connected to the handle, the other end of the connecting rod is connected to the paddle, and a handle length adjustment device and a handle angle adjustment device are provided between the handle and the connecting rod. However, this lumbar spondylolisthesis reduction device requires the paddle to be inserted into the front of the vertebral body before it can be pried. Since there are important blood vessels and organs such as the abdominal aorta in front of the vertebral body, there is a high risk of damaging the annular fiber at the front edge of the intervertebral space and extending the instrument into the front edge of the vertebral body during surgery, which will lead to serious complications if not handled with care. Summary of the invention

[0004] In order to overcome the disadvantage of the existing difficulty in reducing lumbar spondylolisthesis, the present invention provides a lumbar spondylolisthesis distraction and reduction pry bar, which can conveniently realize intervertebral space distraction and release, assist in reducing the slipped vertebral body, and reduce the stress of the pedicle screw.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a lumbar spondylolisthesis distraction and reduction pry bar comprises a handle, a pry bar and a pry plate, a fulcrum baffle is provided at the lower part of the pry bar, a handle is fixed on the top of the pry bar, an anti-slip tooth pattern is fixed on the working surface of the pry plate, a connecting block is fixed on the connecting surface of the pry plate, and the connecting block is hinged to the bottom end of the pry bar through a rotating shaft.

[0006] As a further improvement of the present invention, the lumbar spondylolisthesis distraction and reduction pry bar further includes a baffle positioning assembly and a baffle locking assembly, wherein the baffle positioning assembly includes a groove opened in the length direction of the pry bar, wavy teeth arranged at equal intervals on both sides of the top of the groove, a sliding block embedded in the groove, a pushing block fixed to the top of the sliding block, and connecting rods respectively fixed to both sides of the sliding block, each connecting rod end is fixed with a round block matching the wavy groove between two adjacent wavy teeth, and the side of the sliding block is fixed with the fulcrum baffle;

[0007] The baffle locking assembly comprises slide rails respectively arranged on both sides of the sliding block, hook grooves opened on the slide rails, a pulling block, hook rods with hooks at both ends fixed to the ends of the pulling block, and a locking block fixed to the bottom of the pulling block, each hook rod is placed on the corresponding slide rail and clamped between the connecting rod and the pushing block, and the locking block is placed between the two hook rods, and the length of the locking block is greater than the distance between the two round blocks;

[0008] When the pushing block is pushed forward, the sliding block slides in the groove, driving the baffle locking assembly and the fulcrum baffle to move, so that the fulcrum baffle moves in the length direction of the pry bar to achieve the positioning of the fulcrum baffle; when the pulling block is pulled backward, the hook rod is hooked with the corresponding hook groove, and the locking block is placed between the two round blocks so that the round block is placed in the corresponding wavy groove to achieve locking.

[0009] As a further improvement of the present invention, the cross section of the pry plate is a flat rectangle, and the cross-sectional area of ​​the bottom of the pry plate gradually decreases from the outside to the inside to form a blunt insertion head.

[0010] As a further improvement of the present invention, the cross section of the anti-slip tooth pattern is an acute triangle.

[0011] As a further improvement of the present invention, the handle, the pry bar, the fulcrum baffle, the connecting block, the anti-slip teeth and the pry plate are all made of stainless steel.

[0012] The beneficial effect of the present invention is that, compared with the prior art, the device is simple to manufacture, utilizes the lever principle to loosen and reposition the slipped vertebral body, is easy to operate, and reduces the reliance on the lifting force of the pedicle screw during the lifting and repositioning process by expanding and lifting the end plates of the intervertebral space, thereby avoiding complications of loosening of the pedicle screw during the lifting process and increasing the surgical effect and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a front view of a skid plate of the present invention.

[0016] Figure 3 It is a structural schematic diagram of the pry bar of the present invention.

[0017] Figure 4-Figure 5 It is a schematic diagram of the use state of the present invention.

[0018] In the figure, 1. handle, 2. pry bar, 3. fulcrum baffle, 4. pry plate, 5. anti-slip tooth pattern, 6. connecting block, 7. baffle positioning assembly, 8. baffle locking assembly, 9. groove, 10. wavy teeth, 11. vertebral body. DETAILED DESCRIPTION

[0019] like Figure 1 , Figure 2 and Figure 3 The lumbar spondylolisthesis distraction and reduction pry bar shown comprises a handle (1), a pry bar (2) and a pry plate (4), wherein a fulcrum baffle (3) is provided at the lower part of the pry bar (2), the handle (1) is fixed to the top end of the pry bar (2), the working surface of the pry plate (4) is fixed with anti-slip teeth (5), a connecting block (6) is fixed on the connecting surface of the pry plate (4), and the connecting block (6) is hinged to the bottom end of the pry bar (2) via a rotating shaft.

[0020] The lumbar spondylolisthesis distraction and reduction pry bar also includes a baffle positioning component (7) and a baffle locking component (8), wherein the baffle positioning component (7) includes a groove (9) opened in the length direction of the pry bar (2), wavy teeth (10) arranged at equal intervals on both sides of the top of the groove (9), a sliding block embedded in the groove (9), a pushing block fixed to the top of the sliding block, and connecting rods respectively fixed to both sides of the sliding block, each connecting rod having a round block fixed at the end thereof that matches the wavy groove between two adjacent wavy teeth (10), and the side of the sliding block having the fulcrum baffle (3) fixed thereto.

[0021] The baffle locking assembly (8) comprises slide rails respectively arranged on both sides of the sliding block, hook grooves opened on the slide rails, a pulling block, hook rods with hooks at both ends fixed to the ends of the pulling block, and a locking block fixed to the bottom of the pulling block, each hook rod is placed on the corresponding slide rail and clamped between the connecting rod and the pushing block, and the locking block is placed between the two hook rods, and the length of the locking block is greater than the distance between the two round blocks.

[0022] When the pushing block is pushed forward, the sliding block slides in the groove (9), driving the baffle locking assembly (8) and the fulcrum baffle (3) to move, so that the fulcrum baffle (3) moves in the length direction of the pry bar (2) to achieve the positioning of the fulcrum baffle (3); when the pulling block is pulled backward, the hook rod is hooked with the corresponding hook groove, and the locking block is placed between the two round blocks so that the round block is placed in the corresponding wavy groove to achieve locking.

[0023] The cross section of the pry plate (4) is a flat rectangle, and the cross-sectional area of ​​the bottom of the pry plate (4) gradually decreases from the outside to the inside to form a blunt insertion head; the cross section of the anti-slip tooth pattern (5) is an acute triangle; the handle (1), the pry bar (2), the fulcrum baffle (3), the connecting block (6), the anti-slip tooth pattern (5) and the pry plate (4) are all made of stainless steel.

[0024] When using, Figure 4 As shown, based on the preoperative imaging data, the slippage distance between the vertebrae (11) is estimated, and the baffle positioning assembly (7) is adjusted in vitro to adjust the fulcrum baffle (3) to a suitable position. The fulcrum baffle (3) is then locked by the baffle locking assembly (8), and the prying plate (4) is inserted into the intervertebral space between the slipped vertebrae (11). The anti-slip tooth pattern (5) contacts the end plate of the vertebrae (11) that slips forward. The fulcrum baffle (3) is placed on the posterior edge of the lower vertebrae (11) to serve as a fulcrum when prying, to disperse stress, to prevent damage to the posterior edge of the vertebrae (11), and to limit the prying rod (2) from sliding down during the prying process to damage the blood vessels and tissues in front of the vertebrae (11).

[0025] The surgeon then holds the handle (1) and presses it backward and downward to embed the anti-slip teeth (5) into the end plate of the vertebral body (11) to increase friction. The surgeon then pries the slipped vertebral body (11) forward and upward, repeatedly prying to loosen the intervertebral scar tissue. Figure 5 As shown, the slipped vertebral body (11) is expanded and repositioned, and then the surgeon installs a connecting rod on the pedicle screw and locks it to maintain the repositioned state of the slipped vertebral body (11), and removes the pry plate (4).

[0026] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0027] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A lumbar spondylolisthesis distraction and reduction lever, characterized in that: It comprises a handle, a pry bar and a pry plate, wherein the lower part of the pry bar is provided with a fulcrum baffle, the top end of the pry bar is fixed with a handle, the working surface of the pry plate is fixed with anti-slip teeth, a connecting block is fixed on the connecting surface of the pry plate, and the connecting block is hinged to the bottom end of the pry bar through a rotating shaft; The lumbar spondylolisthesis distraction and reduction pry bar also includes a baffle positioning assembly and a baffle locking assembly, wherein the baffle positioning assembly includes a groove opened in the length direction of the pry bar, wavy teeth arranged at equal intervals on both sides of the top of the groove, a sliding block embedded in the groove, a pushing block fixed to the top of the sliding block, and connecting rods respectively fixed to both sides of the sliding block, each connecting rod end is fixed with a round block matching the wavy groove between two adjacent wavy teeth, and the side of the sliding block is fixed with the fulcrum baffle; The baffle locking assembly comprises slide rails respectively arranged on both sides of the sliding block, hook grooves opened on the slide rails, a pulling block, hook rods with hooks at both ends fixed to the ends of the pulling block, and a locking block fixed to the bottom of the pulling block, each hook rod is placed on the corresponding slide rail and clamped between the connecting rod and the pushing block, and the locking block is placed between the two hook rods, and the length of the locking block is greater than the distance between the two round blocks; When the pushing block is pushed forward, the sliding block slides in the groove, driving the baffle locking assembly and the fulcrum baffle to move, so that the fulcrum baffle moves in the length direction of the pry bar to achieve the positioning of the fulcrum baffle; when the pulling block is pulled backward, the hook rod is hooked with the corresponding hook groove, and the locking block is placed between the two round blocks so that the round block is placed in the corresponding wavy groove to achieve locking; The cross section of the pry plate is a flat rectangle, and the cross-sectional area of ​​the bottom of the pry plate gradually decreases from the outside to the inside to form a blunt insertion head.

2. The lumbar spondylolisthesis distraction and reduction lever according to claim 1, characterized in that: The cross section of the anti-slip tooth pattern is an acute triangle.

3. The lumbar spondylolisthesis distraction and reduction lever according to claim 1, characterized in that: The handle, the pry bar, the fulcrum baffle, the connecting block, the anti-slip teeth and the pry plate are all made of stainless steel.

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