Fixation device for intervertebral bone grafting

Abstract

The utility model relates to medical auxiliary device technical field especially is used for intervertebral bone grafting's fixing device. The utility model discloses the fixed sleeve that sets up along vertical up and down direction and is set to the fixed sleeve of bone grafting funnel lower part, is located fixed sleeve and is used for adjusting the height adjusting subassembly of bone grafting funnel lower end protruding fixed sleeve lower end distance, a pair of respectively fixed sleeve left and right sides and is used for fixing the fixed sleeve and is arranged on the corresponding side vertebral bone fixed mounting assembly and is arranged between two fixed mounting assemblies and is used for adjusting the interval adjusting subassembly between two fixed mounting assemblies. The device solves the problem that the depth of bone grafting funnel is difficult to adjust stably.

Description

Technical Field

[0001] This utility model relates to the field of medical auxiliary device technology, and in particular to a fixation device for intervertebral bone grafting. Background Technology

[0002] During intervertebral disc grafting surgery, a sharp scalpel is used to cut the posterior annulus fibrosus. Then, different sizes of reamers and nucleus pulposus forceps are used to thoroughly remove the degenerated intervertebral disc tissue. A curette is used to scrape away the bony endplate. A bone graft funnel is then placed in the intervertebral space, ensuring its bottom reaches the area requiring bone grafting. The bone graft material is then injected into the intervertebral space through the funnel. However, the following problems exist in clinical practice:

[0003] 1. In the current method of using bone graft funnels, the operator holds the funnel with their hands to control the depth of the bottom of the funnel into the intervertebral space. Since hand support is difficult to ensure stability and is prone to shaking, the bone graft funnel is easily inserted too deeply forward during the insertion process, which can damage major blood vessels, nerves and other organs and tissues in front. Therefore, there is a problem that it is difficult to steadily adjust the depth of the bone graft funnel into the intervertebral space.

[0004] 2. After the bone graft material is injected, it is necessary to insert a bone graft rod into the bone graft funnel to pound and compact the bone graft material below the funnel. During the pounding process, because the bone graft funnel lacks a support point, it may shake as it is pounded, which can easily damage major blood vessels, nerves, and other organs and tissues in front of the intervertebral disc. Utility Model Content

[0005] To address the aforementioned problems, the present invention aims to provide a fixation device for intervertebral bone grafting, which solves the problem of the difficulty in steadily adjusting the depth of the bone graft funnel inserted between the vertebrae.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A fixation device for intervertebral bone grafting includes a fixation sleeve disposed vertically and fitted onto the lower part of the bone graft funnel, a height adjustment component disposed on the fixation sleeve and used to adjust the distance by which the lower end of the bone graft funnel extends beyond the lower end of the fixation sleeve, a pair of fixation mounting components disposed on the left and right sides of the fixation sleeve and used to fix the fixation sleeve onto the corresponding lateral vertebrae, and a spacing adjustment component disposed between the two fixation mounting components and used to adjust the distance between the two fixation mounting components.

[0008] The height adjustment assembly includes a height adjustment sleeve threadedly fitted onto the top of a fixed sleeve, a connecting ring rotatably disposed on the upper side of the inner wall of the height adjustment sleeve, a plurality of connecting rods arranged circumferentially at intervals and fixedly disposed on the lower side of the connecting rings and extending through the lower side of the fixed sleeve, a base plate disposed below the fixed sleeve and fixedly connected to each connecting rod, and an anti-detachment assembly disposed between the height adjustment sleeve and the connecting ring for preventing the connecting ring from falling off the height adjustment sleeve.

[0009] More preferably, the anti-detachment component includes a limiting rail disposed on the upper side of the inner wall of the height adjusting sleeve and a limiting ring fixed on the connecting ring and movably disposed within the limiting rail.

[0010] More preferably, each set of fixed installation components includes a movable part that is horizontally movable on the corresponding side of the fixed sleeve in the left-right direction, a horizontal telescopic rod fixed between the inner wall of the movable part and the outer wall of the corresponding side of the fixed sleeve, a vertical through groove in the lower part of the movable part in the vertical height direction of the fixed sleeve, a negative pressure rod that is movable in the vertical through groove in the vertical direction, a movable groove in the movable part above the corresponding vertical through groove in the vertical height direction of the fixed sleeve, a limiting member fixed at the upper end of the negative pressure rod, a lifting handle fixed at the upper end of the limiting member and extending above the movable part, and an elastic suction cup fixed below the movable part and surrounding the lower end of the vertical through groove.

[0011] More preferably, the spacing adjustment assembly includes a horizontal spacing adjustment sleeve movably disposed between the rear ends of the two movable parts, a pair of horizontal threaded rods respectively fixed on the rear ends of the two movable parts and threadedly connected to the spacing adjustment sleeve, a horizontal connecting sleeve movably disposed between the front ends of the two movable parts, and a pair of horizontal movable rods respectively fixed on the front ends of the two movable parts and whose ends away from the corresponding movable parts extend into the connecting sleeve.

[0012] The two horizontal threaded rods have their thread lines arranged in opposite directions.

[0013] More preferably, each negative pressure rod has an elastic sealing sleeve fixed to its side wall.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model places the fixing sleeve above the bone graft position, and then rotates the height adjustment sleeve along the thread to drive the base plate away from or close to the lower side of the fixing sleeve, so that the base plate supports the bottom end of the bone graft funnel and moves up and down synchronously, thereby adjusting the depth of the bottom end of the bone graft funnel into the vertebrae, solving the problem that the depth of the bone graft funnel into the vertebrae is difficult to adjust stably.

[0016] 2. This utility model presses the fixed installation component onto the corresponding lateral vertebra, and then pulls up the negative pressure rod to create a negative pressure effect between the corresponding elastic suction cup and the vertebra. The fixed sleeve is then fixed onto the vertebra by atmospheric pressure, thereby minimizing the shaking of the bone graft funnel during hammering.

[0017] 3. This utility model controls the position of the support point fixed to the vertebra by using a spacing adjustment component, so that the device can be used for different vertebral spacings. Attached Figure Description

[0018] Figure 1 This is an overall exploded view of the present invention;

[0019] Figure 2 This is an overall axonometric view of the present invention;

[0020] Figure 3 This is an isolated exploded sectional view of a height adjustment component according to this utility model;

[0021] Figure 4 This is an isolated exploded sectional view of a one-sided fixed mounting component according to the present invention.

[0022] Figure 5 This is a structural schematic diagram of one usage state of the present invention;

[0023] Figure 6 This is a structural schematic diagram of a second usage state of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Fixed sleeve; 2. Height adjustment assembly; 21. Height adjustment sleeve; 22. Connecting ring; 23. Connecting rod; 24. Base plate; 25. Anti-detachment assembly; 251. Limiting track; 252. Limiting ring; 3. Fixed installation assembly; 31. Movable part; 32. Telescopic rod; 33. Vertical through groove; 34. Negative pressure rod; 35. Movable groove; 36. Limiting part; 37. Lifting handle; 38. Elastic suction cup; 4. Spacing adjustment assembly; 41. Spacing adjustment sleeve; 42. Threaded rod; 43. Connecting sleeve; 44. Movable rod; 5. Elastic sealing sleeve; A. Bone graft funnel; B. Vertebra. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the fixation device for intervertebral bone grafting in this embodiment includes a fixation sleeve 1 that is set vertically and sleeved on the lower part of the bone graft funnel, a height adjustment component 2 that is set on the fixation sleeve 1 and used to adjust the distance of the lower end of the bone graft funnel extending out of the lower end of the fixation sleeve 1, a pair of fixation mounting components 3 that are respectively set on the left and right sides of the fixation sleeve 1 and used to fix the fixation sleeve 1 on the corresponding lateral vertebra, and a spacing adjustment component 4 that is set between the two fixation mounting components 3 and used to adjust the distance between the two fixation mounting components 3.

[0028] The height adjustment assembly 2 includes a height adjustment sleeve 21 threadedly fitted onto the upper part of the fixed sleeve 1, a connecting ring 22 rotatably disposed on the upper side of the inner wall of the height adjustment sleeve 21, a plurality of connecting rods 23 arranged circumferentially at intervals and fixed to the lower side of the connecting rings 22 and extending through the lower side of the fixed sleeve 1, a base plate 24 disposed below the fixed sleeve 1 and fixedly connected to each connecting rod 23, and an anti-detachment assembly 25 disposed between the height adjustment sleeve 21 and the connecting rings 22 for preventing the connecting rings 22 from falling off the height adjustment sleeve 21.

[0029] When using this product, insert the bottom end of the bone graft funnel downwards from the top end of the fixing sleeve 1 until the bottom end of the bone graft funnel is positioned above the inner side of the base plate 24. Figure 5 As shown, the height adjusting sleeve 21 is then rotated, causing it to move downwards along the thread direction. This applies downward pressure to the connecting ring 22, causing each connecting rod 23 to move downwards gradually, which in turn moves the base plate 24 downwards. This allows the bottom of the bone graft funnel to move downwards with the base plate 24 and extend into the space between the vertebrae until it is in the appropriate position. Afterwards, the rotation of the height adjusting sleeve 21 is stopped. Figure 6 As shown.

[0030] like Figure 1 and Figure 3 As shown, the anti-slip assembly 25 includes a limiting rail 251 located on the upper side of the inner wall of the height adjusting sleeve 21 and a limiting ring 252 fixed on the connecting ring 22 and movably disposed within the limiting rail 251.

[0031] When this product is in use, the limiting ring 252 is always placed within the limiting track 251 when the height adjusting sleeve 21 is rotated, so that the limiting ring 252 always remains relatively stationary with the height adjusting sleeve 21 along the vertical height direction.

[0032] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, each fixed installation assembly 3 includes a movable part 31 that is horizontally movable on the corresponding side of the fixed sleeve 1 in the left-right direction, a horizontal telescopic rod 32 fixed between the inner wall of the movable part 31 and the outer wall of the corresponding side of the fixed sleeve 1, a vertical through groove 33 located in the lower part of the movable part 31 in the vertical height direction of the fixed sleeve 1, a negative pressure rod 34 that is movable in the vertical through groove 33 in the vertical direction, a movable groove 35 located in the upper part of the movable part 31 above the corresponding vertical through groove 33 in the vertical height direction of the fixed sleeve 1, a limiting member 36 fixed at the upper end of the negative pressure rod 34, a lifting handle 37 fixed at the upper end of the limiting member 36 and extending above the movable part 31, and an elastic suction cup 38 fixed below the movable part 31 and surrounding the lower end of the vertical through groove 33.

[0033] When using this product, after placing the elastic suction cups 38 on the corresponding lateral vertebra B surface, press down on the two movable parts 31 to make the elastic suction cups 38 adhere to the corresponding lateral vertebra surface. Then, grasp and pull up the two lifting handles 37 to slide the negative pressure rod 34 upward. This causes the space inside the elastic suction cup 38 to increase with the volume of the corresponding vertical through groove 33, resulting in a decrease in air pressure inside the elastic suction cup 38. This allows atmospheric pressure to apply pressure to the elastic suction cup 38, fixing it firmly to the corresponding vertebra surface. The limiting part 36 extends from the upper end of the movable groove 35 above the movable part 31. Rotating the lifting handle 37 causes the limiting part 36 to abut against the surface of the movable part 31, preventing the negative pressure rod 34 from moving downward, thus completing the fixed installation. Figure 6 As shown.

[0034] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the spacing adjustment assembly 4 includes a horizontal spacing adjustment sleeve 41 movably disposed between the rear ends of the two movable parts 31, a pair of horizontal threaded rods 42 respectively fixed on the rear ends of the two movable parts 31 and threadedly connected to the spacing adjustment sleeve 41, a horizontal connecting sleeve 43 movably disposed between the front ends of the two movable parts 31, and a pair of horizontal movable rods 44 respectively fixed on the front ends of the two movable parts 31 and whose ends away from the corresponding movable parts 31 extend into the connecting sleeve 43.

[0035] The two horizontal threaded rods have 42 threaded lines set in opposite directions.

[0036] When using this product, adjusting the distance between the two elastic suction cups 38 involves rotating the distance adjusting sleeve 41 to move the threaded rods 42 on both sides away from the distance adjusting sleeve 41. This simultaneously moves the movable rod 44 away from the connecting sleeve 43, causing the movable parts 41 on both sides to move away from the fixed sleeve 1. This allows the two elastic suction cups 38 to move above the resection plane of the corresponding vertebra B. Figures 5 to 6 As shown.

[0037] like Figure 1 and Figure 4 Each negative pressure rod 34 shown is provided with an elastic sealing sleeve 5 fixed on its side wall.

[0038] When this product is in use, the vertical through groove 33 and the space inside the elastic suction cup 38 are sealed when the elastic sealing sleeve 5 explodes onto the surface of the vertebra.

[0039] The working principle of this device is as follows:

[0040] Step 1: After removing the degenerated intervertebral disc at the corresponding surgical segment, a plane is formed on the posterior surfaces of the superior and inferior vertebral bodies. Then, the fixation sleeve 1 is placed vertically at the center of the lesion. Figure 5 As shown, the spacing adjustment sleeve 41 is then rotated, causing the two threaded rods 42 connected to it to move away from the spacing adjustment sleeve 41. This, in turn, causes the movable parts 31 on both sides to move away from the fixed sleeve 1 until the elastic suction cup 38 corresponds to the plane of vertebra B. Figure 6 As shown.

[0041] Step 2: Press down on both movable parts 31 to make the elastic suction cup 38 adhere to the surface of the corresponding vertebra B. Then, grasp and pull up the two lifting handles 37 respectively, causing the negative pressure rod 34 to slide upward. This increases the space inside the elastic suction cup 38 with the corresponding vertical through groove 33, resulting in a decrease in air pressure inside the elastic suction cup 38. This allows atmospheric pressure to apply pressure to the elastic suction cup 38, fixing it firmly against the surface of the corresponding vertebra B. The limiting member 36 extends from the upper end of the movable groove 35 above the movable part 31. Rotate the lifting handle 37 to move the limiting member 36 to abut against the surface of the movable part 31, preventing the negative pressure rod 34 from moving downward. This completes the fixed installation. Figure 6 As shown.

[0042] Step 3: Insert the bottom end of the bone graft funnel A downwards from the top end of the fixing sleeve 1 until the bottom end of the bone graft funnel A is positioned above the inner side of the base plate 24. Figure 5 As shown, the height adjusting sleeve 21 is then rotated, causing it to move downwards along the thread direction. This applies downward pressure to the connecting ring 22, causing each connecting rod 23 to move downwards gradually, which in turn moves the base plate 24 downwards. This allows the bottom end of the bone graft funnel A to move downwards with the base plate 24 and extend into the space between the vertebrae until it is in the appropriate position. Afterwards, the rotation of the height adjusting sleeve 21 is stopped. Figure 6 As shown.

[0043] Step 4: Pour the bone graft material from the top of the bone graft funnel A and inject it into the intervertebral space B from the bottom. After pouring, use a bone graft rod to extend from the bone graft funnel A into the intervertebral space and continuously hammer the bone graft material downwards to compact it. During the hammering process, the fixing sleeve 1 is subjected to the suction force of the elastic suction cups 38 on both sides, which makes the fixing sleeve 1 move the bone graft funnel A to be stably placed in its original position to prevent it from shaking.

[0044] Step 5: After use, rotate the height adjustment sleeve 21 in the opposite direction to make the height adjustment sleeve 21 move upward along the thread and drive the connecting ring 22 to move upward in sync, thereby causing the base plate 24 to move the bottom end of the bone graft funnel A upward until it is removed from the intervertebral space.

[0045] Step 6: Hold the lifting handle 37 and rotate it so that the limiting member 36 rotates to the corresponding position of the movable groove 35. Under the action of atmospheric pressure, the negative pressure rod 24 moves downward and the limiting member 36 slides into the movable groove 35. This causes the volume of the elastic suction cup 38 and the vertical through groove 33 to decrease and the air pressure to increase until it is equal to the atmospheric pressure. At this point, the device can be removed and the next surgical operation can be performed.

[0046] The above description is only a specific embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fixation device for intervertebral bone grafting, characterized in that: It includes a fixed sleeve (1) set vertically and fitted on the lower part of the bone graft funnel, a height adjustment component (2) set on the fixed sleeve (1) and used to adjust the distance of the lower end of the bone graft funnel extending out of the lower end of the fixed sleeve (1), a pair of fixed installation components (3) respectively set on the left and right sides of the fixed sleeve (1) and used to fix the fixed sleeve (1) on the corresponding lateral vertebra, and a spacing adjustment component (4) set between the two fixed installation components (3) and used to adjust the distance between the two fixed installation components (3); The height adjustment assembly (2) includes a height adjustment sleeve (21) threadedly fitted above the fixed sleeve (1), a connecting ring (22) rotatably disposed on the upper side of the inner wall of the height adjustment sleeve (21), a plurality of connecting rods (23) arranged circumferentially and fixedly disposed on the lower side of the connecting rings (22) and extending through the lower side of the fixed sleeve (1), a base plate (24) disposed below the fixed sleeve (1) and fixedly connected to each connecting rod (23), and an anti-detachment assembly (25) disposed between the height adjustment sleeve (21) and the connecting rings (22) for preventing the connecting rings (22) from falling off the height adjustment sleeve (21).

2. The fixation device for intervertebral bone grafting according to claim 1, characterized in that: The anti-slip assembly (25) includes a limiting rail (251) located on the upper side of the inner wall of the height adjusting sleeve (21) and a limiting ring (252) fixed on the connecting ring (22) and movably positioned within the limiting rail (251).

3. The fixation device for intervertebral bone grafting according to claim 1, characterized in that: Each fixed installation assembly (3) includes a movable part (31) that is horizontally movable on the corresponding side of the fixed sleeve (1) in the left-right direction, a horizontal telescopic rod (32) fixed between the inner wall of the movable part (31) and the outer wall of the corresponding side of the fixed sleeve (1), a vertical through groove (33) located in the lower part of the movable part (31) in the vertical height direction of the fixed sleeve (1), a negative pressure rod (34) that is movable in the vertical through groove (33) in the vertical direction, a movable groove (35) located in the upper part of the movable part (31) above the corresponding vertical through groove (33) in the vertical height direction of the fixed sleeve (1), a limiting part (36) fixed at the upper end of the negative pressure rod (34), a lifting handle (37) fixed at the upper end of the limiting part (36) and extending out of the upper part of the movable part (31), and an elastic suction cup (38) fixed at the lower part of the movable part (31) and surrounding the lower end of the vertical through groove (33). Each negative pressure bar (34) has its side wall sealed to the inner wall of the corresponding vertical through groove (33).

4. The fixation device for intervertebral bone grafting according to claim 3, characterized in that: The spacing adjustment assembly (4) includes a horizontal spacing adjustment sleeve (41) movably disposed between the rear ends of the two movable parts (31), a pair of horizontal threaded rods (42) respectively fixed on the rear ends of the two movable parts (31) and threadedly connected to the spacing adjustment sleeve (41), a horizontal connecting sleeve (43) movably disposed between the front ends of the two movable parts (31), and a pair of horizontal movable rods (44) respectively fixed on the front ends of the two movable parts (31) and whose ends away from the corresponding movable parts (31) extend into the connecting sleeve (43) for movability; The two horizontal threaded rods (42) have their threads arranged in opposite directions.

5. The fixation device for intervertebral bone grafting according to claim 3, characterized in that: Each negative pressure rod (34) has an elastic sealing sleeve (5) fixed on its side wall.

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