Internal fixing device for lumbar spondylolysis

Abstract

The utility model discloses a lumbar spondylolysis internal fixing device, which relates to the technical field of lumbar spondylolysis internal fixing instruments, and comprises a connecting box main body, one side of the connecting box main body is connected with a first threaded screw rod through a bearing, and the outer side of the first threaded screw rod is sleeved with a first arc rod in a threaded manner; a second threaded screw rod is connected to the side, away from the first threaded screw rod, of the connecting box body through a bearing, a second arc rod is connected to the outer side of the second threaded screw rod in a threaded and sleeving mode, a first adjusting assembly is arranged in the connecting box body, and detachable connecting U-shaped fixing screw grooves are formed in the first arc rod and the second arc rod correspondingly; and one end of the group of U-shaped fixed screw grooves is fixedly connected with a fixed plate. By arranging the second adjusting assembly, the fastening force of the vertebral plate hook can be adjusted without replacing the vertebral plate hook, and the device is easy to quantify due to the indication sliding block arranged on the vertebral plate hook, so that the spine isthmus fissure internal fixation operation is more convenient and accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of lumbar vertebrae internal fixation instruments, in particular to a lumbar spondylolysis internal fixation device. Background Art

[0002] Lumbar spondylolysis is a discontinuous bone defect in the isthmus between the upper and lower articular processes of the lumbar vertebrae on one or both sides, also known as spondylolysis or isthmic nonunion; patients are mostly adolescents, with a higher incidence in males, and can occur in any segment; spondylolysis often occurs at L4 or L5, or at both L4 and L5, with varying widths of the crack, often occurring 2-9mm below the pedicle, with serrated or rounded ends, and may form bone bridges; the defect is often filled with fibrocartilage tissue.

[0003] An existing patent (publication number: CN114052872A) discloses a controllable and adjustable internal fixation device for lumbar spondylolysis, which improves the internal fixation device for spondylolysis by cooperating with a first arc rod, a second arc rod, a screw rod, a screw rod connecting portion, a U-shaped fixing screw groove, a vertebral hook plate, a pedicle screw, a nut, and an adjusting T-rod. The connecting arm structure between the vertebral hook plate and the screw cap fixing portion is designed to be adjustable, and the structure for realizing telescopic adjustment is a knob screw rod plus mechanical engagement. The connecting arm can be contracted by adjusting the screw rod connecting portion to achieve the purpose of moving the vertebral hook plate and the screw cap fixing portion toward each other, thereby applying pressure to the spondylolysis and docking it, and then internal fixation is directly performed through the device until new bone is produced at the spondylolysis and the spondylolysis is healed.

[0004] However, the above technical solution still has certain defects. The lamina hook has a fixed length, and the extension length of the lamina hook can only be adjusted by adjusting the tightness of the screw plug, thereby adjusting the tightening strength of the isthmic spondylosis. The adjustment method is cumbersome. However, since the length of the lamina hook is fixed, excessive adjustment of the lamina hook by the screw plug will expand the surgical area. Therefore, when the isthmic spondylosis needs to be tightened to a size that is too large or too small, the lamina hook must be replaced. Generally, the tightening distance of the lamina hook can only be judged based on the doctor's experience and cannot be measured. For this reason, a lumbar spondylosis internal fixation device is proposed. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a lumbar spondylolysis internal fixation device to solve the technical problems raised in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lumbar spondylolysis internal fixation device, comprising a connecting box body, one side of the connecting box body is connected to a first threaded screw by a bearing, the first threaded screw is threadedly sleeved with a first arc rod on the outer side, the connecting box body is connected to a second threaded screw by a bearing on the side away from the first threaded screw, the second threaded screw is threadedly sleeved with a second arc rod on the outer side, a first adjustment component is arranged in the connecting box body, the first arc rod and the second arc rod are both provided with a detachable U-shaped fixing screw groove, one end of a group of the U-shaped fixing screw grooves is fixedly connected to a fixing plate, an active chamber is opened in the fixing plate, and a telescopic rod is slidably connected in the active chamber, the telescopic rod is fixedly connected to a lamina hook on the side away from the fixing plate, and a second adjustment component is arranged on one side of the fixing plate;

[0007] The second adjustment component includes a fixed sleeve fixedly installed on the front end of one side of the fixed plate, a pull rod is penetrated by one end of the fixed sleeve, a plurality of groups of equally distributed limiting holes are opened on one side of the telescopic rod, the pull rod matches the limiting holes, a fixing ring is fixedly sleeved on the outer side of the pull rod in the inner cavity of the fixed sleeve, and a spring is installed between one side of the fixing ring and the top of the inner cavity of the fixed sleeve.

[0008] As a preferred technical solution of a lumbar spondylolysis internal fixation device of the utility model, the pull rod has one end away from the limiting hole fixedly connected with a pull handle, and the initial state of the spring is a compressed state.

[0009] As a preferred technical solution of a lumbar spondylolysis internal fixation device of the utility model, a slide groove is provided on one side of the fixing plate, an indicating slider is fixedly installed on the bottom end of one side of the telescopic rod, the indicating slider passes through the slide groove and extends to the outside of the fixing plate, the indicating slider matches the slide groove, and the fixing plate is provided with a scale line on the same side of the slide groove.

[0010] As an optimal technical solution for a lumbar spondylolysis internal fixation device of the utility model, one end of another group of U-shaped fixing screw grooves is fixedly connected to a pedicle screw, and the telescopic rod is fixedly connected to a vertebral plate hook on the side away from the fixing plate, and the openings of the two groups of U-shaped fixing screw grooves are both connected to nuts through threads.

[0011] As a preferred technical solution of a lumbar spondylolysis internal fixation device of the utility model, a limiting block is fixedly installed at the rear end of the telescopic rod.

[0012] As an optimal technical solution for a lumbar spondylolysis internal fixation device of the utility model, the first adjusting component includes a first bevel gear fixedly connected to one end of the first threaded screw, and the second threaded screw is fixedly connected to a second bevel gear near one end of the first threaded screw. One side of the connecting box body is connected to a rotating shaft through a bearing, and one end of the rotating shaft is fixedly connected to a third bevel gear, and the two sides of the third bevel gear are respectively meshed with the first bevel gear and the second bevel gear, and the other end of the rotating shaft extends through and extends to the outside of the connecting box body and is fixedly connected to a connecting block, a cross-shaped slot is provided on one side of the connecting block, a cross-shaped slot is matched with a cross-shaped block, and the other side of the cross-shaped block is fixedly connected to a T-shaped rod.

[0013] As a preferred technical solution of the lumbar spondylolysis internal fixation device of the utility model, a positive magnet is installed on one side of the cross-shaped clamping block, and a negative magnet is installed on the bottom of the inner cavity of the cross-shaped clamping slot.

[0014] In summary, the utility model mainly has the following beneficial effects:

[0015] 1. The utility model provides a first arc rod and a second arc rod so that the connecting arm formed by the arc rod and the screw rod fits the curvature of the human spine, which is in line with human physiology. This design can make the force of the device more stable after internal fixation. The length of the lamina hook can be adjusted according to needs. The pull handle is pulled to drive the pull rod to move, and the fixing ring fixed thereto further squeezes the spring until the pull rod is separated from the limiting hole, releasing the limit of the telescopic rod, and the telescopic rod is pulled to adjust the length. A sliding groove is also provided on one side of the fixing plate, and the indicating slider slides in the sliding groove. The upper side of the sliding groove is provided with a scale line, which can intuitively indicate the telescopic distance of the telescopic rod and the lamina hook. When the adjustment is completed, the pull handle is released, and the pull rod is pushed to reinsert the limiting hole through the elastic force of the spring itself to complete the limit, thereby fixing the telescopic rod and the lamina hook. By providing the second adjusting component, the tightening force of the lamina hook can be adjusted without replacing the lamina hook, and the indicating slider provided on the lamina hook makes the device easy to quantify, thereby making the operation of spinal spondylolysis internal fixation surgery more convenient and accurate.

[0016] 2. In the utility model, an operator inserts a cross-shaped card block into a cross-shaped card slot in the connecting block and rotates the T-shaped rod, thereby driving the connecting block and the rotating shaft to rotate together, thereby driving the third bevel gear to rotate together. At this time, the first bevel gear and the second bevel gear meshing with the third bevel gear rotate together, thereby driving the first threaded screw and the second threaded screw to rotate together, thereby causing the first arc rod and the second arc rod to move relative to each other, thereby achieving inward pressurization. The pressurization process can be manually controlled to avoid too little pressure, which will fail to achieve the effect of close closure of the isthmic fissure and affect the production of new bones in the later stage, and too much pressure, which is easy to cause secondary damage to the vertebral body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the connection box body of the utility model;

[0019] Figure 3 This is an expanded view of the fixed plate and telescopic rod of the utility model;

[0020] Figure 4 It is a side sectional view of the fixing sleeve of the utility model.

[0021] In the figure: 100, connection box body; 200, first adjustment component; 300, second adjustment component;

[0022] 110, first threaded screw rod; 120, second threaded screw rod; 130, first arc rod; 140, second arc rod; 150, U-shaped fixing screw groove; 160, nut; 170, pedicle screw; 180, fixing plate; 190, telescopic rod; 191, limit block; 1910, lamina hook;

[0023] 210, first bevel gear; 220, second bevel gear; 230, third bevel gear; 240, connecting block; 250, cross-shaped slot; 260, T-shaped rod; 270, cross-shaped block;

[0024] 310, fixed sleeve; 320, pull rod; 330, limit hole; 340, fixed ring; 350, spring; 360, slide groove; 370, indicator slider; 380, scale line. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0026] The following describes an embodiment of the utility model based on its overall structure.

[0027] A lumbar spondylolysis internal fixation device, such as Figure 1-4As shown, it includes a connection box body 100, one side of the connection box body 100 is connected to a first threaded screw 110 through a bearing, the outer side of the first threaded screw 110 is threadedly sleeved with a first arc rod 130, the side of the connection box body 100 away from the first threaded screw 110 is connected to a second threaded screw 120 through a bearing, the outer side of the second threaded screw 120 is threadedly sleeved with a second arc rod 140, a first adjustment component 200 is provided in the connection box body 100, and a detachable U-shaped connection is provided on the first arc rod 130 and the second arc rod 140. A fixing screw groove 150 is provided, one end of a set of U-shaped fixing screw grooves 150 is fixedly connected to a fixing plate 180, a movable chamber is provided in the fixing plate 180, and a telescopic rod 190 is slidably connected in the movable chamber, a limit block 191 is fixedly installed at the rear end of the telescopic rod 190, and a lamina hook 1910 is fixedly connected to the side of the telescopic rod 190 away from the fixing plate 180, and another set of U-shaped fixing screw grooves 150 is fixedly connected to a pedicle screw 170 at one end, and a lamina hook 1910 is fixedly connected to the side of the telescopic rod 190 away from the fixing plate 180. The two sets of U-shaped fixing screw grooves 150 are fixedly connected to the fixing plate 180. The openings of the fixing screw grooves 150 are all connected with nuts 160 through threads, and a second adjustment assembly 300 is provided on one side of the fixing plate 180; the second adjustment assembly 300 includes a fixing sleeve 310 fixedly installed on the front end of one side of the fixing plate 180, a pull rod 320 is passed through one end of the fixing sleeve 310, and a plurality of groups of equally spaced limiting holes 330 are opened on one side of the telescopic rod 190, the pull rod 320 matches the limiting holes 330, and the outer side of the pull rod 320 is fixedly sleeved with a fixing ring 340 in the inner cavity of the fixing sleeve 310, and the fixing ring 340 is fixedly sleeved on the fixing sleeve 310. A spring 350 is installed between one side of 40 and the top of the inner cavity of the fixed sleeve 310, and a pull handle is fixedly connected to the end of the pull rod 320 away from the limiting hole 330. The initial state of the spring 350 is a compressed state. A slide groove 360 ​​is provided on one side of the fixed plate 180, and an indicating slider 370 is fixedly installed on the bottom end of one side of the telescopic rod 190. The indicating slider 370 passes through the slide groove 360 ​​and extends to the outside of the fixed plate 180. The indicating slider 370 matches the slide groove 360, and the fixed plate 180 is provided with a scale line 380 on the same side of the slide groove 360.

[0028] By setting the first arc rod 130 and the second arc rod 140, the connecting arm formed by the arc rod and the screw rod fits the curvature of the human spine, which is in line with human physiology. This design can make the force of the device more stable after internal fixation. The length of the vertebral plate hook 1910 can be adjusted according to needs, and the pull rod 320 can be moved by pulling the handle. The fixing ring 340 fixed thereto further squeezes the spring 350 until the pull rod 320 is disengaged from the limiting hole 330, thereby releasing the limit on the telescopic rod 190, and pulling the telescopic rod 190 to adjust the length. A sliding groove 360 ​​is also provided on one side of the fixing plate 180, and the indicating slider 370 slides in the sliding groove 360. The sliding groove 360 A scale line 380 is provided on the upper side, and the scale line 380 can intuitively indicate the telescopic distance of the telescopic rod 190 and the lamina hook 1910. When the adjustment is completed, the handle is released, and the pull rod 320 is pushed to reinsert into the limiting hole 330 by the elastic force of the spring 350 itself to complete the limiting, thereby fixing the telescopic rod 190 and the lamina hook 1910. By setting the second adjustment component 300, the tightening force of the lamina hook 1910 can be adjusted without replacing the lamina hook 1910, and the indicating slider 370 set on the lamina hook 1910 makes the device easy to quantify, thereby making the operation of spinal spondylolysis internal fixation surgery more convenient and accurate.

[0029] Please refer to Figure 1 and 2 As shown, the first adjustment component 200 includes a first bevel gear 210 fixedly connected to one end of the first threaded screw 110, and the second threaded screw 120 is fixedly connected to the second bevel gear 220 near the end of the first threaded screw 110. A rotating shaft is connected to one side of the connecting box body 100 through a bearing, and a third bevel gear 230 is fixedly connected to one end of the rotating shaft. The two sides of the third bevel gear 230 are respectively meshed with the first bevel gear 210 and the second bevel gear 220. The other end of the rotating shaft extends through and extends to the outside of the connecting box body 100 and is fixedly connected to a connecting block 240. A cross-shaped slot 250 is provided on one side of the connecting block 240, and a cross-shaped block 270 is provided in the cross-shaped slot 250. A T-shaped rod 260 is fixedly connected to the other side of the cross-shaped block 270.

[0030] The operator inserts the cross-shaped clamping block 270 into the cross-shaped clamping groove 250 in the connecting block 240, rotates the T-shaped rod 260, drives the connecting block 240 and the rotating shaft to rotate together, thereby drives the third bevel gear 230 to rotate together, and at this time, the first bevel gear 210 and the second bevel gear 220 meshing with the third bevel gear 230 rotate together, thereby driving the first threaded screw 110 and the second threaded screw 120 to rotate together, and then the first arc rod 130 and the second arc rod 140 move relative to each other, realizing inward pressurization. The pressurization process can be manually controlled to avoid too little pressure, which will not achieve the effect of close closure of the isthmic fissure and affect the later new bone production, and too much pressure, which is easy to cause secondary vertebral injury.

[0031] Please refer to Figure 2 As shown, a positive magnet is installed on one side of the cross-shaped block 270, and a negative magnet is installed at the bottom of the inner cavity of the cross-shaped slot 250.

[0032] By providing positive and negative magnets, the interaction force is increased to prevent the T-shaped rod 260 and the cross-shaped clamping block 270 from falling off after being inserted into the cross-shaped clamping groove 250 in the connecting block 240, thereby preventing inconvenience in use.

[0033] When in use, the length of the lamina hook 1910 is adjusted as needed, and the pull handle is pulled to drive the pull rod 320 to move, and the fixing ring 340 fixed thereto further squeezes the spring 350 until the pull rod 320 disengages from the limiting hole 330, thereby releasing the limit on the telescopic rod 190, and the telescopic rod 190 is pulled to adjust the length. A sliding groove 360 ​​is also provided on one side of the fixing plate 180, and the indicating slider 370 slides in the sliding groove 360. A scale line 380 is provided on the upper side of the sliding groove 360, and the scale line 380 can intuitively indicate the telescopic distance of the telescopic rod 190 and the lamina hook 1910. When the adjustment is completed, release the handle, and use the elastic force of the spring 350 to push the pull rod 320 to reinsert the limit hole 330 to complete the limit, so that the telescopic rod 190 and the lamina hook 1910 are fixed. By setting the second adjustment component 300, the tightening force of the lamina hook 1910 can be adjusted without replacing the lamina hook 1910, and the indicating slider 370 set on the lamina hook 1910 makes the device easy to quantify, thereby making the operation of spinal isthmic fixation surgery more convenient and accurate. The parts not involved in the device are the same as the existing technology or can be implemented by the existing technology.

[0034] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. A lumbar spondylolysis internal fixation device, comprising a connection box body (100), characterized in that: A first threaded screw (110) is connected to one side of the connection box body (100) via a bearing, and a first arc rod (130) is threadedly sleeved on the outer side of the first threaded screw (110). A second threaded screw (120) is connected to the side of the connection box body (100) away from the first threaded screw (110) via a bearing, and a second arc rod (140) is threadedly sleeved on the outer side of the second threaded screw (120). A first adjustment component (200) is provided in the connection box body (100), and the first arc rod (130) is threadedly sleeved on the outer side of the first threaded screw (110). The rod (130) and the second arc rod (140) are both provided with a detachable U-shaped fixing screw groove (150), one end of a group of the U-shaped fixing screw grooves (150) is fixedly connected to a fixing plate (180), an activity chamber is provided in the fixing plate (180), and a telescopic rod (190) is slidably connected in the activity chamber, a lamina hook (1910) is fixedly connected to the side of the telescopic rod (190) away from the fixing plate (180), and a second adjustment component (300) is provided on one side of the fixing plate (180); The second adjustment component (300) includes a fixed sleeve (310) fixedly mounted on the front end of one side of the fixed plate (180), a pull rod (320) passing through one end of the fixed sleeve (310), a plurality of groups of equally spaced limiting holes (330) are opened on one side of the telescopic rod (190), the pull rod (320) matches the limiting holes (330), the outer side of the pull rod (320) is located in the inner cavity of the fixed sleeve (310) and is fixedly sleeved with a fixing ring (340), and a spring (350) is installed between one side of the fixing ring (340) and the top of the inner cavity of the fixed sleeve (310).

2. The lumbar spondylolysis internal fixation device according to claim 1, characterized in that: One end of the pull rod (320) away from the limiting hole (330) is fixedly connected to a pull handle, and the initial state of the spring (350) is a compressed state.

3. The lumbar spondylolysis internal fixation device according to claim 1, characterized in that: A slide groove (360) is provided on one side of the fixed plate (180); an indicating slider (370) is fixedly installed on the bottom end of one side of the telescopic rod (190); the indicating slider (370) passes through the slide groove (360) and extends to the outside of the fixed plate (180); the indicating slider (370) matches the slide groove (360); and a scale line (380) is provided on the same side of the fixed plate (180) as the slide groove (360).

4. The lumbar spondylolysis internal fixation device according to claim 1, characterized in that: One end of the other group of U-shaped fixing screw grooves (150) is fixedly connected to a pedicle screw (170), and the side of the telescopic rod (190) away from the fixing plate (180) is fixedly connected to a vertebral plate hook (1910), and the openings of the two groups of U-shaped fixing screw grooves (150) are both threadedly connected to nuts (160).

5. The lumbar spondylolysis internal fixation device according to claim 3, characterized in that: A limiting block (191) is fixedly mounted on the rear end of the telescopic rod (190).

6. The lumbar spondylolysis internal fixation device according to claim 1, characterized in that: The first adjustment assembly (200) comprises a first bevel gear (210) fixedly connected to one end of the first threaded screw (110); the second threaded screw (120) is fixedly connected to one end of the first threaded screw (110); one side of the connection box body (100) is connected to a rotating shaft via a bearing, and one end of the rotating shaft is fixedly connected to a third bevel gear (230); two sides of the third bevel gear (230) are respectively meshed with the first bevel gear (210) and the second bevel gear (220); the other end of the rotating shaft extends through and extends to the outside of the connection box body (100) and is fixedly connected to a connection block (240); one side of the connection block (240) is provided with a cross-shaped slot (250); a cross-shaped slot (250) is matched with a cross-shaped slot block (270); the other side of the cross-shaped slot (270) is fixedly connected to a T-shaped rod (260).

7. The lumbar spondylolysis internal fixation device according to claim 6, characterized in that: A positive magnet is installed on one side of the cross-shaped clamping block (270), and a negative magnet is installed at the bottom of the inner cavity of the cross-shaped clamping slot (250).

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