A dural scissors for neurosurgery and method of use

Abstract

The application discloses a dural membrane scissors for neurosurgery, which is characterized by comprising a scissors provided with a first blade arm and a second blade arm, wherein the first blade arm and the second blade arm are rotationally connected through a first rotating disc and a second rotating disc connected thereto, and a shaft sleeve is arranged at the second rotating disc; through the proper resistance of the air bag, the doctor can exert force with his hand, which can improve the doctor's attention and hand feeling during the operation, and is beneficial to more accurate operation; when the first blade arm and the second blade arm are away from each other, the guide shaft gradually leaves the air bag, but the recovery of the air bag needs a certain reaction time, so that when the first blade arm and the second blade arm are opened outward, the air bag does not generate a counteracting pushing force on the first blade arm and the second blade arm, so that the doctor can slowly open the first blade arm and the second blade arm outward, avoids the interference of the counteracting force of the air bag, and makes the operation more accurate.

Description

Technical Field

[0001] This invention relates to the field of surgical dura mater scissors, and particularly to a delicate dura mater scissor for separating the meninges in neurosurgery and its method of use. Background Technology

[0002] The dura mater is a thick and tough double-layered membrane. The outer layer is the periosteum of the inner surface of the skull, loosely attached only to the tegmentum, especially in the occipital and temporal regions, and is called the periosteum. However, it attaches more firmly to the sutures and base of the skull, making it difficult to separate. There is no intracranial dura mater lumen. The inner layer of the dura mater is thicker and tougher than the outer layer, continuing with the spinal dura mater at the foramen magnum, and is called the meningeal layer. Its main function is to protect the brain. During brain surgery, this area needs to be cut open. This operation is performed using specialized medical instruments called dura mater scissors. Dura mater scissors generally consist of a blade, handle, and blade, and are mainly used for surgeries involving meningeal lesions. Dura mater scissors are generally made of stainless steel.

[0003] Chinese patent CN205286478U discloses a meningeal scissor, including a first handle and a second handle, a fixed post, a movable post, a separation support, and a cutting blade. Each handle has at least one finger ring at its end. The meningeal scissor also includes a sliding separator movably connected to the fixed post. The sliding separator is connected to the fixed post and its position is adjusted by the engagement of an adjustable pinion with a rack on the fixed post. A rotatable handwheel connected to the pinion is used to adjust the position of the sliding separator along the rack. The distal end of the sliding separator includes a pressure plate, which includes a first arm and a second arm. The width between the first arm and the second arm can be varied as needed, and the width is greater than the corresponding width of the separation support. Compared with the prior art, this invention has the following advantages: the product can be operated with one hand, can safely and effectively separate two adjacent layers of meningeal tissue, and allows the surgeon to cut only the overlying tissue.

[0004] However, when using these meningeal scissors, because the scissors are relatively small and the structure at the hinge is relatively simple, the force applied during the opening and closing of the scissors is almost the same and the resistance is small. However, during the closing of the scissors, due to the lack of certain resistance, the doctor's hand does not feel the force applied, thus affecting the feel of using the scissors.

[0005] Therefore, it is necessary to provide a delicate meningeal scissor for separating the meninges in neurosurgery and a method of using it to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a delicate meningeal scissor for neurosurgical dissection, in order to solve the problem in the prior art where, due to the small size of the scissors and the simple structure at the hinge, the force applied during the opening and closing of the scissors is almost the same and the resistance is small. However, during the closing process, the lack of sufficient resistance results in poor force application to the surgeon's hand, thus affecting the feel of using the scissors.

[0007] To achieve the above objectives, an airbag is installed at the connection between the first and second cutting arms. The airbag provides some obstruction when the first and second cutting arms approach each other, which can improve the feel during use.

[0008] Based on the above ideas, the present invention provides the following technical solution: a pair of scissors including a first blade arm and a second blade arm, wherein the first blade arm and the second blade arm are rotatably connected by a first turntable and a second turntable connected thereto, respectively, a bushing is provided at the second turntable, the bushing passes through the second turntable and is fixedly connected to the second turntable, and a rotating shaft is rotatably arranged at the top of the bushing, the rotating shaft passes through the first turntable and is rotatably connected to the first turntable;

[0009] A fixed ring is fixedly connected to the top of the first turntable, and a collar is provided between the fixed ring and the rotating shaft. The collar and the rotating shaft are rotatably connected by a one-way bearing.

[0010] The bottom of the rotating shaft extends downward to form a vertical shaft. A groove is provided on the inner wall of the bushing, and an air bladder is provided inside the groove. A guide shaft that cooperates with the groove is fixedly connected to the outside of the vertical shaft. When the first and second cutting arms open outward, the guide shaft moves away from the air bladder inside the groove. When the first and second cutting arms move inward, the guide shaft gradually squeezes the air bladder inside the groove.

[0011] As a further aspect of the present invention: both the first and second cutter arms are provided with disconnected slots, and connecting portions are provided at the slots to reconnect the disconnected first and second cutter arms respectively.

[0012] As a further aspect of the present invention: the top and bottom of the connecting part are both fixedly connected with reinforcing ribs, and the reinforcing ribs are parallel to the width direction of the connecting part.

[0013] As a further aspect of the present invention: a fixing part is fixedly provided at the slot where the first and second cutter arms are disconnected, and both ends of the connecting part are fixedly connected to the fixing part.

[0014] As a further aspect of the present invention: an adhesive portion is bonded to the top of the first and second cutter arms on one side of the groove, the adhesive portion extends outward to form a limiting portion, a crease line is provided between the limiting portion and the adhesive portion to allow the limiting portion to rotate relative to the adhesive portion, and a limiting block extends outward at an angle from the top of the limiting portion, the limiting block being inclined toward the adhesive portion.

[0015] As a further aspect of the present invention: the first and second cutter arms are fixedly provided with stop bars at the slot openings, and the stop bars are U-shaped.

[0016] As a further aspect of the present invention: the first and second blade arms are bent into an S-shape, with a first curved portion formed near the hand grip and a second curved portion formed near the blade tip, so that the scissors as a whole are S-shaped.

[0017] As a further aspect of the present invention, the airbags are symmetrically distributed about the central axis of the bushing.

[0018] A method for using meningeal scissors includes the following steps:

[0019] S1. Adjust the degree of curvature of the scissors according to usage habits and specific clinical conditions. Specifically, insert the limiting part into the stop bar from one side and out from the other side of the stop bar, and fix the limiting part to the stop bar by engaging the limiting block with the stop bar.

[0020] S2. Surgical operations are performed by engaging the first and second cutting arms.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The collar drives the rotating shaft to rotate through the one-way bearing, and the rotating shaft drives the guide shaft on its outer side to rotate. At this time, the airbag inside the slide groove will form a certain resistance to the rotating guide shaft, so that the doctor's hand needs to exert a certain amount of force to drive the first blade arm to rotate for cutting. Therefore, by using the appropriate resistance of the airbag, the doctor's hand is prompted to exert force, which can improve the doctor's concentration on the one hand and improve the doctor's feel during surgery, which is conducive to more precise operation. When the first blade arm and the blade arm move away from each other, the guide shaft gradually moves away from the airbag. However, the airbag needs a certain reaction time to recover. Therefore, when the first blade arm and the second blade arm open outward, the airbag will not exert a reaction force on the first blade arm and the second blade arm. This allows the doctor to slowly open the first blade arm and the second blade arm outward, avoiding interference from the reaction force of the airbag, making the operation more precise. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between the first and second cutter arms of the present invention;

[0026] Figure 4 This is a schematic diagram of the fixing ring and collar structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the guide shaft and slide groove of the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of the bushing of the present invention;

[0029] Figure 7 This is a schematic diagram of the adhesive part and the limiting part of the present invention;

[0030] Figure 8 This is the present invention. Figure 3 Enlarged view of the A-section structure;

[0031] Figure 9 This is a schematic diagram of the connecting part structure of the present invention;

[0032] Figure 10 This is the present invention. Figure 7 Enlarged view of the structure of section B;

[0033] Figure 11 This is a side view of the scissors of the present invention.

[0034] In the diagram: 1. First cutter arm; 2. Second cutter arm; 3. Second turntable; 4. Screw; 5. Cover plate; 6. First turntable; 7. Adhesive part; 8. Crease line; 9. Limiting part; 10. Limiting block; 11. Stop bar; 12. Groove; 13. Reinforcing rib; 14. Connecting part; 15. Fixing part; 16. Rotating shaft; 17. One-way bearing; 18. Collar; 19. Fixing ring; 20. Bushing; 21. Vertical shaft; 22. Guide shaft; 23. Airbag; 24. Slide groove; 25. Blind hole; 26. Air inlet pipe; 27. Exhaust pipe; 28. Round hole; 29. ​​Gasket; 30. First bend; 31. Second bend. Detailed Implementation

[0035] like Figure 1-6As shown in Figure 8, a delicate meningeal scissor for separating the meninges in neurosurgery includes scissors. The scissors include a first blade arm 1 and a second blade arm 2. The first blade arm 1 and the second blade arm 2 are rotatably connected to each other via a first turntable 6 and a second turntable 3 connected thereto. A bushing 20 is provided at the second turntable 3, which passes through the second turntable 3 and is fixedly connected to it. A rotating shaft 16 is rotatably arranged at the top of the bushing 20, which passes through the first turntable 6 and is rotatably connected to it. A fixing ring 19 is fixedly connected to the top of the first turntable 6. A collar 18 is provided between the fixing ring 19 and the rotating shaft 16. The collar 18 and the rotating shaft 16 are rotatably connected via a one-way bearing 17. A cover plate 5 is fixedly connected to the top of the fixing ring 19, and a gasket 29 is provided between the top of the rotating shaft 16 and the cover plate 5.

[0036] Furthermore, a screw 4 is provided on the outside of the fixing ring 19. The screw 4 passes through the fixing ring 19 and extends to the through hole on the outer surface of the collar 18. The fixing ring 19 and the collar 18 are fixed relative to each other by the cooperation of the screw 4 and the through hole on the collar 18.

[0037] Furthermore, a vertical shaft 21 extends downward from the bottom of the rotating shaft 16. The diameter of the vertical shaft 21 is smaller than the diameter of the rotating shaft 16. A circular hole 28 is provided at the top of the bushing 20, and a blind hole 25 is provided at the bottom of the circular hole 28 inside the bushing 20. The vertical shaft 21 cooperates with the blind hole 25, allowing the vertical shaft 21 to be rotatably connected to the bushing 20. A sliding groove 24 is provided on the inner wall of the circular hole 28, symmetrically distributed on both sides of the circular hole 28. An airbag 23 is provided inside the sliding groove 24. One side of the airbag 23 is bonded to the bushing 20, and the other side is a free end. An air inlet pipe 26 and an exhaust pipe 27 are respectively provided inside the airbag 23. Each of the components 7 is equipped with a one-way valve, allowing the gas inside the airbag 23 to be discharged unidirectionally through the exhaust pipe 27, while external air can enter the airbag 23 unidirectionally through the intake pipe 26. A guide shaft 22 is fixedly connected to the outside of the vertical shaft 21. The guide shaft 22 cooperates with the slide groove 24 and can slide inside the slide groove 24. The guide shaft 22 improves the reliability of the connection between the vertical shaft 21 and the bushing 20. On the other hand, when the guide shaft 22 slides inside the slide groove 24, it can compress the airbag 23. Since the airbag 23 is symmetrically distributed about the central axis of the bushing 20, when the first cutter arm 1 and the second cutter arm 2 open outwards, the guide shaft 22 moves away from the airbag 23. It will not compress the airbag 23. Meanwhile, the collar 18 is connected to the rotating shaft 16 via a one-way bearing 17. Therefore, when the first cutter arm 1 and the second cutter arm 2 open outwards, the collar 18 rotates independently and cannot drive the rotating shaft 16 to rotate. Thus, the friction experienced by the first cutter arm 1 and the second cutter arm 2 when rotating outwards is relatively small, facilitating their opening. When the first cutter arm 1 and the second cutter arm 2 approach each other, the collar 18 can drive the rotating shaft 16 to rotate via the one-way bearing 17, thereby driving the guide shaft 22 to rotate. At this time, the guide shaft 22 rotating inside the groove 24 can compress the airbag 23. Due to the obstruction of the airbag 23, the first cutter arm 1 and the second cutter arm 2 interact... During the cutting process, there will be some resistance. When the first blade arm 1 and the second blade arm 2 squeeze the airbag 23, the gas inside is discharged through the exhaust pipe 27. When the first blade arm 1 and the second blade arm 2 open outward and gradually move away from the airbag 23, the airbag 23 will gradually recover under its own elastic recovery force. However, the recovery of the airbag 23 requires a certain reaction time. Therefore, when the first blade arm 1 and the second blade arm 2 open outward, the airbag 23 will not exert a counter-force on the first blade arm 1 and the second blade arm 2. This allows the doctor to slowly open the first blade arm 1 and the second blade arm 2 outward and avoid interference from the airbag 23. Repeating the above actions can complete the cutting and other actions.

[0038] In summary, during the use of this device, when the first blade arm 1 and the second blade arm 2 approach the cutting or clamping object, the first blade arm 1 will drive the fixed ring 19 at its top to rotate. The fixed ring 19 is fixedly connected to the collar 18 by screws 4, so the fixed ring 19 can drive the collar 18 to rotate. The collar 18 drives the rotating shaft 16 to rotate through the one-way bearing 17, and the rotating shaft 16 drives the guide shaft 22 on its outer side to rotate. At this time, the airbag 23 inside the slide 24 will form a certain resistance to the rotating guide shaft 22, so that the doctor's hand needs to exert a certain amount of force to drive the first blade arm 1 to rotate for cutting. Therefore, by appropriately resisting the airbag 23, the doctor's hand is prompted to exert force, which can improve the doctor's concentration on the one hand and improve the doctor's feel during the operation on the other hand, which is conducive to more precise operation. When the first blade arm 1 and the blade arm are far apart, As the airbag 23 moves away from the first blade arm 1, the guide shaft 22 gradually moves away from the airbag 23. However, the airbag 23 requires a certain reaction time to recover. Therefore, when the first blade arm 1 and the second blade arm 2 open outwards, the airbag 23 does not exert a counterforce on the first blade arm 1 and the second blade arm 2. This allows the doctor to slowly open the first blade arm 1 and the second blade arm 2 outwards, avoiding interference from the counterforce of the airbag 23, thus making the operation more precise. Traditional blades use a spring between the first blade arm 1 and the second blade arm 2 to achieve this effect. However, when the first blade arm 1 and the second blade arm 2 move away from each other, the spring exerts a certain counterforce on either the first blade arm 1 or the second blade arm 2. The doctor needs to overcome this counterforce to open the first blade arm 1 and the second blade arm 2. Therefore, under the influence of the spring counterforce, there may be slight shaking, which may lead to a decrease in the precision of the operation.

[0039] like Figure 1 , 7As shown in Figures 9 and 10, both the first cutter arm 1 and the second cutter arm 2 have discontinuous slots 12. Connecting portions 14 are provided at the slots 12 to reconnect the discontinuous first cutter arm 1 and the second cutter arm 2. The connecting portions 14 are made of steel sheets, and reinforcing ribs 13 are fixedly connected to the top and bottom of the connecting portions 14. The reinforcing ribs 13 are parallel to the width direction of the connecting portions 14 and are evenly distributed on the connecting portions 14. Fixing portions 15 are fixedly provided at the discontinuous slots 12 of the first cutter arm 1 and the second cutter arm 2, and both ends of the connecting portions 14 are fixedly connected to the fixing portions 15. The top of the second blade arm 2 is bonded to one side of the slot 12 with an adhesive part 7, and the adhesive part 7 extends outward to form a limiting part 9. A crease line 8 is provided between the limiting part 9 and the adhesive part 7, so that the limiting part 9 can rotate relative to the adhesive part 7. A limiting block 10 extends outward at the top of the limiting part 9 at an angle. The limiting block 10 is inclined towards the adhesive part 7. A stop bar 11 is fixedly provided at the slot 12 for the first blade arm 1 and the second blade arm 2. The stop bar 11 is U-shaped, so that there is a gap between the bottom of the stop bar 11 and the top of the scissors. When the limiting part 9 passes through this gap, the limiting block 10 is stuck on the other side of the stop bar 11.

[0040] When using the scissors, if the operating angle needs to be adjusted, the first blade arm 1 and the second blade arm 2, which are disconnected on both sides of the slot 12, can be bent. Since the disconnected first blade arm 1 and the second blade arm 2 are connected by the connecting part 14, and the connecting part 14 is made of steel sheet and has a certain elasticity, when the first blade arm 1 and the second blade arm 2 are bent, the connecting part 14 will bend along with them. At this time, the limiting part 9 passes through one side of the stop bar 11, and the limiting block 10 on the limiting part 9 is locked on the other side of the stop bar 11. Through the cooperation of the stop bar 11 and the limiting block 10, the limiting part 9 can be limited to prevent it from springing back, thereby maintaining the bending angle of the first blade arm 1 and the second blade arm 2. Since the connecting part 14 has a certain elastic restoring force, it will tighten the limiting part 9, so that the limiting block 10 is locked on the side of the stop bar 11, thereby improving the stability of the first blade arm 1 and the second blade arm 2 after bending.

[0041] In summary, the above structure allows for changes in the bending angles of the first blade arm 1 and the second blade arm 2. When the surgical area is relatively narrow and requires simple bending for operation, the first blade arm 1 and the second blade arm 2 can be bent to lock the limiting block 10 and the stop bar 11 together. The bent connecting part 14 can improve the stability of the locking between the limiting block 10 and the stop bar 11, thereby maintaining the stability of the scissors during operation. After the first blade arm 1 and the second blade arm 2 are bent, the doctor's upper arm can be in a natural hanging position during operation. Only the angle of the forearm needs to be adjusted to operate on the wound with the scissors without adjusting the angle of the upper arm, which saves effort during the operation.

[0042] As another embodiment of the above solution, such as Figure 11 As shown, in actual use, the first blade arm 1 and the second blade arm 2 are bent into an S-shape during production, forming a first curved section 30 near the hand grip and a second curved section 31 near the blade tip, thus making the scissors as a whole S-shape. The straight section is between the first curved section 30 and the second curved section 31. At the same time, the blade tip of the scissors extends away from the second curved section 31. When in use, the doctor holds the scissors, and the straight section on the scissors is not almost horizontal to the ground. However, due to the presence of the second curved section 31, the blade tip of the scissors bends downward, which is beneficial for operating on the patient's wound. At this time, the doctor's upper arm is almost perpendicular to the ground, while the forearm is almost horizontal to the ground, thus saving effort during operation. In contrast, traditional scissors, due to their straight design, require the doctor to frequently raise their upper arm to operate on the patient's wound during surgery, which is more strenuous.

[0043] Because the first blade arm 1 and the second blade arm 2 are bent into an S-shape during production, the tips of the first blade arm 1 and the second blade arm 2 form a parallel section, which can be approximately parallel to the patient's wound position, making it easier for doctors to operate, saving effort during use, and making it easier to operate.

[0044] This solution is simpler to manufacture than the previous one and has a lower production cost, but the bending angle cannot be adjusted, which limits its use.

[0045] A method for using meningeal scissors includes the following steps:

[0046] S1. Adjust the degree of curvature of the scissors according to usage habits and specific clinical conditions. Specifically, insert the limiting part 9 into the stop bar 11 from one side and out from the other side of the stop bar 11. Fix the limiting part 9 and the stop bar 11 by engaging the limiting block 10 with the stop bar 11.

[0047] S2. Surgical operations are performed by engaging the first and second cutting arms.

[0048] Working principle: A guide shaft 22 is fixedly connected to the outside of the vertical shaft 21. The guide shaft 22 cooperates with the slide groove 24 and can slide inside the slide groove 24. The guide shaft 22 improves the reliability of the connection between the vertical shaft 21 and the bushing 20. On the other hand, when the guide shaft 22 slides inside the slide groove 24, it can compress the air bladder 23. The air bladder 23 is symmetrically distributed about the central axis of the bushing 20. Therefore, when the first cutter arm 1 and the second cutter arm 2 open outward, the guide shaft 22 moves away from the air bladder 23 and will not compress the air bladder 23. At the same time, the collar 18 is connected to the rotating shaft 16 through a one-way bearing 17. Therefore, when the first cutter arm 1 and the second cutter arm 2 open outward, the collar 18 rotates alone and cannot drive the rotating shaft 16 to rotate. Therefore, the friction force on the first cutter arm 1 and the second cutter arm 2 when they rotate outward is small, which facilitates their opening. When the first cutter arm 1 and the second cutter arm 2 approach each other, the collar 18, through the one-way bearing 17, The rotating shaft 16 can be driven to rotate, which in turn drives the guide shaft 22 to rotate. At this time, the rotation of the guide shaft 22 inside the slide groove 24 can compress the airbag 23. Due to the obstruction of the airbag 23, the first blade arm 1 and the second blade arm 2 will encounter certain resistance during the process of approaching each other for cutting. When the first blade arm 1 and the second blade arm 2 compress the airbag 23, the gas inside it is discharged through the exhaust pipe 27. When the first blade arm 1 and the second blade arm 2 open outward and gradually move away from the airbag 23, the airbag 23 will gradually recover under its own elastic recovery force. However, the recovery of the airbag 23 requires a certain reaction time. Therefore, when the first blade arm 1 and the second blade arm 2 open outward, the airbag 23 will not generate a counter-push force on the first blade arm 1 and the second blade arm 2, so that the doctor can slowly open the first blade arm 1 and the second blade arm 2 outward and avoid interference from the airbag 23. Repeating the above actions can complete the cutting and other actions.

Claims

1. A set of delicate meningeal scissors for neurosurgical dissection, comprising scissors with a first cutting arm and a second cutting arm, wherein the first cutting arm and the second cutting arm are rotatably connected via a first turntable and a second turntable connected thereto, characterized in that: A bushing is provided at the second turntable, the bushing passes through the second turntable and is fixedly connected to the second turntable, and a rotating shaft is rotatably arranged at the top of the bushing, the rotating shaft passes through the first turntable and is rotatably connected to the first turntable; A fixed ring is fixedly connected to the top of the first turntable, and a collar is provided between the fixed ring and the rotating shaft. The collar and the rotating shaft are rotatably connected by a one-way bearing. The bottom of the rotating shaft extends downward to form a vertical shaft. A groove is provided on the inner wall of the bushing, and an air bladder is provided inside the groove. A guide shaft that cooperates with the groove is fixedly connected to the outside of the vertical shaft. When the first and second cutting arms open outward, the guide shaft moves away from the air bladder inside the groove. When the first and second cutting arms move inward, the guide shaft gradually squeezes the air bladder inside the groove.

2. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 1, characterized in that: Both the first and second cutter arms are provided with disconnected slots, and connecting parts are provided at the slots to reconnect the disconnected first and second cutter arms.

3. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 2, characterized in that: The top and bottom of the connecting part are fixedly connected with reinforcing ribs, which are parallel to the width direction of the connecting part.

4. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 3, characterized in that: A fixing part is fixedly provided at the slot where the first and second cutter arms are disconnected, and both ends of the connecting part are fixedly connected to the fixing part.

5. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 2, characterized in that: An adhesive portion is bonded to the top of the first and second cutter arms on one side of the groove. The adhesive portion extends outward to form a limiting portion. A crease line is provided between the limiting portion and the adhesive portion to allow the limiting portion to rotate relative to the adhesive portion. A limiting block extends outward at an angle from the top of the limiting portion, and the limiting block is inclined toward the adhesive portion.

6. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 2, characterized in that: The first and second cutter arms are fixedly equipped with stop bars at the slot openings, and the stop bars are U-shaped.

7. A set of delicate meningeal scissors for separating the meninges in neurosurgery according to any one of claims 1-6, characterized in that: The first and second blade arms are bent into an S-shape, with a first curved section near the hand and a second curved section near the blade tip, making the scissors as a whole S-shape.

8. The meningeal scissors for delicate meningeal dissection in neurosurgery according to claim 1, characterized in that: The airbags are symmetrically distributed about the central axis of the bushing.

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