A surgical instrument for ligamentum flavum dissection

Abstract

The utility model belongs to the field of spine operation instrument, especially is involved in a kind of surgical instrument for yellow ligament stripping.The technology includes the nerve stripper of horizontal arrangement, and the shell is horizontally fixed on the nerve stripper, the connecting rod that is left and right sliding cooperation with it is horizontally arranged in the shell, the left end of connecting rod is vertically fixed with mounting plate, cutter is installed on the left side wall of mounting plate, the right end of connecting rod is horizontally fixed with core rod, the outer side of core rod is sleeved with the sliding rod that is left and right sliding cooperation with it, the energy storage component that sliding rod moves left is arranged between sliding rod and connecting rod, the inner side wall of shell is provided with control assembly for controlling cutter to pop out and cut off yellow ligament.In the utility model, yellow ligament is stripped by the left end of nerve stripper, the power that connecting rod moves left is accumulated when sliding rod moves left, the locking of connecting rod is released, connecting rod moves left and drives cutter to pop out shell, and yellow ligament is cut off in cooperation with nerve stripper.

Description

Technical Field

[0001] This utility model belongs to the field of spinal surgical instruments, and in particular relates to a surgical instrument for ligamentum flavum dissection. Background Technology

[0002] Ligamentum flavum dissection is a procedure typically performed in spinal surgery, primarily used to treat symptoms of spinal cord or nerve root compression caused by ligamentum flavum hypertrophy or ossification. By dissecting the ligamentum flavum, the compression of the spinal cord or nerve roots can be relieved, thereby alleviating clinical symptoms. The ligamentum flavum forms part of the posterior wall of the spinal canal and connects adjacent superior and inferior vertebral arches. Ossification of the ligamentum flavum leads to compression of the spinal cord and nerve roots, causing the spinal cord to shift anteriorly. During ligamentum flavum resection, the ligamentum flavum is cut using a dissector, scissors, and a scalpel. The ligamentum flavum is first hooked up with a hook on a nerve dissector to prevent damage to the dura mater and nerve roots adhered to the ligamentum flavum.

[0003] Currently, the nerve dissectors used in clinical practice are usually made of a thin, flat metal rod. Due to the limited operating space, it is difficult to use another tool to cut the ligamentum flavum while using the nerve dissector for separation, which increases the difficulty of the operation, reduces the efficiency of the operation, and is prone to causing nerve damage to the patient. Utility Model Content

[0004] The purpose of this invention is to provide a surgical instrument for ligamentum flavum dissection, which has a simple structure and can separate and cut the ligamentum flavum at the same time.

[0005] The surgical instrument for dissecting the ligamentum flavum includes a horizontally positioned nerve dissector with a horizontally fixed outer shell. Inside the outer shell, a connecting rod is horizontally positioned and slides left and right. A mounting plate is vertically positioned at the left end of the connecting rod, and a blade is mounted on the left side wall of the mounting plate. A core rod is horizontally fixed at the right end of the connecting rod, and a sliding rod is fitted on the outside of the core rod and slides left and right. An energy storage component is provided between the sliding rod and the connecting rod, allowing the blade to accumulate kinetic energy when the sliding rod moves to the left. A control component is provided on the inner side wall of the outer shell to control the blade to eject and cut the ligamentum flavum.

[0006] Furthermore, the energy storage assembly includes a first fixing plate, which is vertically fixed to the outside of the slide rod, and a second fixing plate is vertically fixed to the outside of the connecting rod. A spring is installed between the two fixing plates, and in the natural state of the spring, there is a gap between the left end of the slide rod and the right end of the connecting rod.

[0007] Furthermore, the control component includes a third fixing plate, which is vertically fixed to the inner wall of the housing. The third fixing plate has a through hole for the second fixing plate to pass through. A stop block is vertically fixed to the outer wall of the second fixing plate. The third fixing plate has a through groove for the stop block to pass through. A driving component for driving the core rod to rotate is provided on the inner wall of the slide rod.

[0008] Furthermore, the driving component includes a limiting block, which is fixed on the outer side wall of the core rod. The left end of the slide rod has an insertion hole to the right, and the core rod is independently inserted into the insertion hole. A limiting groove is formed on the inner side wall of the insertion hole along the length direction of the slide rod, and the limiting block is independently inserted into the limiting groove.

[0009] Furthermore, the left end of the nerve dissector is curved upwards, and the cutter and the left end of the nerve dissector are located on the same vertical plane.

[0010] Furthermore, the diameters of the first fixing plate and the second fixing plate are equal, and the diameters of both fixing plates are smaller than the diameter of the through hole in the third fixing plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In this invention, the ligamentum flavum is dissected by the left end of the nerve dissector. The ligamentum flavum is placed at the left end of the nerve dissector. Under the action of the energy storage component, when the slide bar moves to the left, it stores the power for the connecting rod to move to the left. Under the action of the control component, the locking of the connecting rod is released, and the connecting rod moves to the left, causing the cutter to pop out of the outer shell, which works with the nerve dissector to cut the ligamentum flavum. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0015] Figure 3 for Figure 1 A magnified view of a section at point B in the middle;

[0016] Figure 4 for Figure 1 Enlarged view after cross-section at CC;

[0017] Figure 5 for Figure 1 Enlarged view after cross-section at point DD;

[0018] The components in the diagram are named as follows: 1. Nerve dissector; 2. Cutting tool; 3. Mounting plate; 4. Housing; 5. Slide rod; 6. Core rod; 7. Connecting rod; 8. First fixing plate; 9. Limiting groove; 10. Insertion hole; 11. Spring; 12. Limiting block; 13. Second fixing plate; 14. Third fixing plate; 15. Stop block; 16. Through groove. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Example

[0020] This embodiment describes a surgical instrument for ligamentum flavum dissection, such as... Figures 1 to 5 As shown, it includes a horizontally positioned nerve dissector 1, which is an existing technology used to dissect or separate the periosteum and soft tissue attached to the bone surface during surgery, especially in neurosurgery, for the separation and handling of nerve tissue. It helps surgeons operate more precisely during surgery, reduces damage to surrounding tissues, and improves the success rate of the surgery. The left end of the nerve dissector 1 is curved upwards for dissecting the ligamentum flavum, and the end of the nerve dissector 1 has a blunt tip with a spherical structure to avoid damage to the dural sac and nerve roots during the surgical process.

[0021] A casing 4 is horizontally fixed to the top of the nerve dissector 1. The casing 4 is horizontally fixed to the top of the nerve dissector 1, and a channel is opened inside the casing 4 along the length direction of the casing 4.

[0022] A connecting rod 7 is horizontally arranged inside the outer shell 4 and slides left and right with it. The connecting rod 7 is horizontally arranged inside the outer shell 4 and slides left and right with the outer shell 4. It is used to drive the cutter 2 to move and cooperate with the nerve dissector 1 to cut the ligamentum flavum.

[0023] A mounting plate 3 is vertically installed on the left end of the connecting rod 7. A sleeve is installed on the right side wall of the mounting plate 3. A limit plate is vertically fixed on the left end of the connecting rod 7. The limit plate is inserted into the sleeve. When the connecting rod 7 rotates, the mounting plate 3 will not rotate with the connecting rod 7. A slide is installed on the inner side wall of the outer shell 4 to limit the rotation of the mounting plate 3, ensuring that the cutter 2 on the mounting plate 3 is in a vertical position when it pops out of the outer shell 4, so as to cooperate with the left end of the nerve dissector 1 to cut the ligamentum flavum.

[0024] A blade 2 is installed on the left side wall of the mounting plate 3. The back of the blade 2 is vertically installed on the left side wall of the mounting plate 3. The blade of the blade 2 is directly facing the left curved part of the nerve dissector 1. When the connecting rod 7 drives the blade 2 to move to the left, the blade 2 cooperates with the nerve dissector 1 to cut the ligamentum flavum.

[0025] The right end of the connecting rod 7 is horizontally fixed to the core rod 6, and the left end of the core rod 6 is horizontally fixed to the right end of the connecting rod 7. When the connecting rod 7 moves, it drives the core rod 6 to move together.

[0026] The outer side of the core rod 6 is fitted with a slide rod 5 that slides left and right with it. The left end of the slide rod 5 has a hole 10 opening to the right, and the right end of the core rod 6 is independently inserted into the hole 10. The core rod 6 and the slide rod 5 slide left and right with each other.

[0027] A first fixing plate 8 is vertically fixed to the outer side of the sliding rod 5. A through hole is formed in the middle of the first fixing plate 8, allowing the sliding rod 5 to pass horizontally through the hole. When the sliding rod 5 moves, it causes the first fixing plate 8 to move left and right together. A second fixing plate 13 is vertically fixed to the outer side of the connecting rod 7. A through hole is formed in the middle of the second fixing plate 13, allowing the connecting rod 7 to pass horizontally through the hole. When the connecting rod 7 moves, it causes the second fixing plate 13 to move left and right together. A spring 11 is installed between the two fixing plates. The left end of the spring 11 is fixed to the right side wall of the second fixing plate 13, and the right end of the spring 11 is fixed to the left side wall of the first fixing plate 8. In its natural state, there is a gap between the left end of the slide rod 5 and the right end of the connecting rod 7. The spring 11 is compressed and stores energy to provide the connecting rod 7 with the power to move to the left. This paragraph as a whole constitutes an energy storage component for the slide rod 5 to move to the left to store kinetic energy for the cutter 2. When the energy storage component is used, when the slide rod 5 moves to the left, it drives the first fixed plate 8 to move to the left as well. The spring 11 is compressed and deformed. After rotating the slide rod 5 to release the lock on the second fixed plate 13, the spring 11 loses the force and returns to its original deformation. At this time, the position of the first fixed plate 8 remains unchanged. The spring 11 pushes the second fixed plate 13 to the left, driving the connecting rod 7 to move to the left, and the cutter 2 cuts the ligamentum flavum.

[0028] A third fixing plate 14 is vertically fixed to the inner wall of the outer casing 4, and the outer wall of the third fixing plate 14 is fixed to the inner wall of the outer casing 4. A through hole is provided on the third fixing plate 14 for the second fixing plate 13 to pass through. The second fixing plate 13 passes through the third fixing plate 14 through the through hole. A stop block 15 is vertically fixed to the outer wall of the second fixing plate 13. A through groove 16 is provided on the third fixing plate 14 for the stop block 15 to pass through. The inner wall of rod 5 is provided with a driving component for driving the core rod 6 to rotate; this paragraph as a whole constitutes a control assembly for controlling the tool 2 to pop out and cut the ligamentum flavum. When the control assembly is in use, rotating the slide rod 5 drives the core rod 6 to rotate through the driving component. The connecting rod 7 rotates together with the core rod 6. When the stop block 15 rotates to align with the through groove 16, the locking of the third fixing plate 14 to the second fixing plate 13 is released. The stop block 15 moves to the left through the through groove 16, and the second fixing plate 13 moves horizontally to the left through the through hole of the third fixing plate 14, driving the connecting rod 7 to move to the left together.

[0029] In this embodiment, the ligamentum flavum is dissected by the left end of the nerve dissector 1. The ligamentum flavum is placed at the left end of the nerve dissector 1. The slide bar 5 is pushed to the left, and the energy storage component stores the leftward force for the connecting rod 7. The slide bar 5 is rotated, and the locking of the connecting rod 7 is released by the control component. The energy storage component provides the connecting rod 7 with the kinetic energy to move to the left, and the cutter 2 is ejected from the outer shell 4. It cooperates with the left end of the nerve dissector 1 to cut the ligamentum flavum located between the cutter 2 and the nerve dissector 1. Example

[0030] This embodiment further illustrates the technology, such as Figure 2 and Figure 4 As shown, the driving component includes a limiting block 12, which is fixed on the outer side wall of the core rod 6. When the core rod 6 moves, it drives the limiting block 12 to move together.

[0031] A socket 10 is provided at the left end of the slide rod 5, pointing to the right.

[0032] The core rod 6 is independently inserted into the socket 10. The core rod 6 is horizontally inserted into the socket 10, and the core rod 6 and the slide rod 5 are in a left-right sliding fit.

[0033] A limiting groove 9 is formed on the inner side wall of the insertion hole 10 along the length direction of the slide rod 5. The limiting block 12 is independently installed in the limiting groove 9 and slides left and right along the length direction of the limiting groove 9.

[0034] In this embodiment, when the slide bar 5 rotates, it limits the limit block 12 through the limit groove 9, causing the core rod 6 to rotate together, thereby causing the connecting rod 7 to rotate and releasing the lock on the second fixing plate 13. Example

[0035] This embodiment further illustrates the technology, such as Figure 1 As shown, the left end of the nerve stripper 1 is bent upwards, and the cutter 2 is located on the same vertical plane as the left end of the nerve stripper 1. When the cutter 2 moves horizontally to the left, the ligamentum flavum is located between the bent part of the left end of the nerve stripper 1 and the cutter 2, and is used to cut the ligamentum flavum. Example

[0036] This embodiment further illustrates the technology, such as Figure 1 As shown, the diameters of the first fixing plate 8 and the second fixing plate 13 are equal, and the diameters of both fixing plates are smaller than the diameter of the through hole of the third fixing plate 14. This facilitates the movement of the connecting rod 7 to the left and prevents the third fixing plate 14 from blocking the movement of the connecting rod 7.

Claims

1. A surgical instrument for dissecting the ligamentum flavum, comprising a horizontally arranged nerve dissector (1), with a shell (4) horizontally fixed on the nerve dissector (1), characterized in that: The outer shell (4) is horizontally provided with a connecting rod (7) that slides left and right with it. The left end of the connecting rod (7) is vertically provided with a mounting plate (3). A cutter (2) is installed on the left side wall of the mounting plate (3). The right end of the connecting rod (7) is horizontally fixed with a core rod (6). A sliding rod (5) that slides left and right with it is fitted on the outside of the core rod (6). An energy storage component is provided between the sliding rod (5) and the connecting rod (7) so that the sliding rod (5) can accumulate kinetic energy for the cutter (2) when it moves to the left. The inner side wall of the outer shell (4) is provided with a control component for controlling the cutter (2) to pop out and cut the ligamentum flavum.

2. The surgical instrument for ligamentum flavum dissection according to claim 1, characterized in that: The energy storage assembly includes a first fixing plate (8), which is vertically fixed to the outside of the slide rod (5). A second fixing plate (13) is vertically fixed to the outside of the connecting rod (7). A spring (11) is installed between the two fixing plates. In the natural state of the spring (11), there is a gap between the left end of the slide rod (5) and the right end of the connecting rod (7).

3. The surgical instrument for ligamentum flavum dissection according to claim 2, characterized in that: The control assembly includes a third fixing plate (14), which is vertically fixed on the inner wall of the outer shell (4). The third fixing plate (14) has a through hole for the second fixing plate (13) to pass through. A stop block (15) is vertically fixed on the outer wall of the second fixing plate (13). A through groove (16) for the stop block (15) to pass through is provided on the third fixing plate (14). A drive member for driving the core rod (6) to rotate is provided on the inner wall of the slide rod (5).

4. The surgical instrument for ligamentum flavum dissection according to claim 3, characterized in that: The driving component includes a limiting block (12), which is fixed on the outer wall of the core rod (6). The left end of the slide rod (5) has an insertion hole (10) to the right. The core rod (6) is independently inserted into the insertion hole (10). A limiting groove (9) is opened on the inner wall of the insertion hole (10) along the length direction of the slide rod (5). The limiting block (12) is independently inserted into the limiting groove (9).

5. The surgical instrument for ligamentum flavum dissection according to claim 1, characterized in that: The left end of the nerve stripper (1) is bent upward, and the cutter (2) is located on the same vertical plane as the left end of the nerve stripper (1).

6. The surgical instrument for ligamentum flavum dissection according to claim 3, characterized in that: The diameters of the first fixing plate (8) and the second fixing plate (13) are equal, and the diameters of both fixing plates are smaller than the diameter of the through hole of the third fixing plate (14).

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