Vertebral body distraction device
By designing a vertebral body stretcher including a worm gear and worm mechanism and a limiting tab, the problems of insufficient tissue separation and limited operating angle in the prior art are solved, and multi-angle operation and efficient surgery are achieved.
Patent Information
- Application Number
- CN202420270905.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-04
AI Technical Summary
The existing vertebral body opener cannot effectively separate the tissue structure during vertebral surgery, which limits the observation and operation space of medical staff, and has limited operating angles.
A vertebral body stretcher is designed, using a fixing frame with both upper and lower ends openings, with a limiting tab, a fixing ring, a threaded rod and a sliding sleeve inside. The worm gear and worm mechanism are used to separate the stretching tabs and separate the tissue, providing multi-angle operating space.
It realizes the separation of tissues in vertebral surgery, provides clear operating position and multi-angle operating space, and improves the operation convenience and surgical efficiency of medical staff.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a vertebral body expander. Background Art
[0002] Medical dilators are commonly used tools in spinal surgery. Their main function is to expand the distance between vertebrae longitudinally. The commonly used dilating tools are dilating pliers. The two pliers handles rotate along the axis pin when held in the hand, so that the jaws open outward. The dilating operation is generally achieved with the help of pedicle screws and connecting rods implanted in the vertebral body. When the grooves in the jaws are placed on the connecting rod, the two sides of the jaws can support the screw seat and dilating outward.
[0003] However, existing vertebral spreaders basically use two support rods to insert the vertebrae to separate them, but they do not have the function of separating the tissues at the expanded position, which makes it inconvenient for medical staff to directly observe and operate the screws. Even if the existing vertebral spreaders have the function of separating tissues without affecting observation and operation, they can only be operated from one angle during operation, thus resulting in limited operating space and observation angle. Utility Model Content
[0004] The utility model aims to provide a vertebral body spreader, which can not only separate tissues when performing vertebral body surgery on patients, so that medical staff can clearly observe the operation position, but also can perform related operations from different angles and positions during the operation.
[0005] The above technical objectives of the utility model are achieved through the following technical solutions:
[0006] A vertebral body spreader, comprising a fixed frame with openings at both upper and lower ends, the left and right sides of the inner wall of the fixed frame are provided with limit plates, the middle position of the front and rear ends of the inner wall of the fixed frame is provided with a fixed ring connected with the limit plates, the left and right sides of the fixed ring and the corresponding limit plates are both rotatably connected with threaded rods passing through the limit plates and rotatably connected with the limit plates, the outer wall of each threaded rod is threadedly connected with a sliding sleeve that cooperates with it, the lower end of each sliding sleeve is provided with an L-shaped positioning rod, the lower end of each positioning rod is provided with a fixing rod downward, and the outer walls of the two fixing rods are provided with a half-sized and cylindrical spreading piece along the length direction thereof;
[0007] A first bevel gear is provided at one end of each threaded rod passing through the corresponding limit plate, one end on the left and right sides of the inner wall of the fixed frame is rotatably connected to a worm gear, one side of the outer wall of each worm gear is provided with a second bevel gear meshing with the corresponding first bevel gear, the left and right sides of the upper end of the fixed frame are rotatably connected to a worm meshing with the corresponding worm gear, and a cover body for covering the worm and the threaded rod is provided on the left and right sides of the upper end of the fixed frame.
[0008] By adopting the above technical solution, when using, the device is first sterilized and disinfected. In the initial state, the two sliding sleeves are close to each other to the shortest distance. The medical staff holds the fixing frame, inserts the two expansion plates into the wound of the patient's vertebral body that needs to be expanded, and rotates the worm. The corresponding worm wheel will drive the corresponding second bevel gear to rotate. When the second bevel gear rotates, it will drive the corresponding threaded rod to rotate between the limit plate and the fixing ring through the first bevel gear meshing with it. At the same time, the sliding sleeve on the threaded rod will slide along the fixing frame and away from the fixing ring. Similarly, the worm on the other side is rotated to separate the two expansion plates through the fixing rod on the positioning rod to separate the vertebral body and block the tissue structure. After the vertebral body is expanded, the medical staff can perform corresponding operations from the fixing ring, and the gap between the two expansion plates makes it convenient for the medical staff to observe the situation at the wound at any time, so as to facilitate subsequent surgical operations.
[0009] The utility model is further configured as follows: sliding bars are provided at both front and rear ends of the inner wall of the fixed frame between the two limiting pieces along the length direction thereof, and sliding blocks are provided at both front and rear ends of the outer wall of each sliding sleeve which are engaged with the sliding bars and are slidably connected thereto.
[0010] By adopting the above technical solution, not only can the two sliding sleeves slide along the sliding bar, but also the sliding sleeves can be prevented from rotating together with the threaded rod when the threaded rod rotates.
[0011] The utility model is further configured as follows: a connecting rod is provided between the inner walls of the two worms.
[0012] By adopting the above technical solution, the two threaded rods can be controlled to rotate together through the connecting rod so as to make the two sliding sleeves move synchronously, thereby reducing the operation time.
[0013] The utility model is further configured as follows: the outer wall of each opening piece is provided with a measuring scale along its height direction.
[0014] By adopting the above technical solution, it is convenient to control the depth of the expansion piece implanted into the vertebral body when inserting the expansion piece, so as to avoid inserting it too deep or too shallow.
[0015] The utility model is further configured as follows: a notch is provided downwardly at the middle position of the front end of the upper end of the fixing frame and the fixing ring.
[0016] By adopting the above technical solution, medical staff can use surgical tools conveniently without restriction.
[0017] In summary, the utility model has the following beneficial effects:
[0018] First, when performing vertebral surgery on a patient, the utility model can not only separate the tissues so that the medical staff can clearly observe the operation position, but also perform related operations from different angles and positions during the operation;
[0019] Secondly, the utility model can realize self-locking according to the actual required size of the expanded vertebral body without additional operation;
[0020] Thirdly, the connecting rod of the utility model can control two threaded rods to rotate together through the worm on one side so as to make the two sliding sleeves move synchronously, thus reducing the operation time. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0022] Figure 2 It is mainly used to show the position and connection relationship of each component;
[0023] Figure 3 It is a working state diagram of the utility model.
[0024] In the figure: 1. fixed frame; 11. limit plate; 12. fixed ring; 13. notch; 14. threaded rod; 15. sliding sleeve; 16. positioning rod; 17. fixing rod; 18. expansion plate; 19. measuring scale; 2. sliding bar; 21. slider; 22. first bevel gear; 23. worm gear; 24. second bevel gear; 25. worm; 26. connecting rod; 27. cover body. DETAILED DESCRIPTION
[0025] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0027] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] Example, see Figure 1-3 A vertebral distractor comprises a rectangular fixed frame 1 with openings at both upper and lower ends, a limiting plate 11 is arranged on the left and right sides of the inner wall of the fixed frame 1, a fixed ring 12 connected to the fixed frame 1 is arranged in the middle position of the front and rear ends of the inner wall of the fixed frame 1, a notch 13 is opened downwardly through the fixed frame 1 and the middle position of the upper front end of the fixed ring 12, and the left and right sides of the fixed ring 12 are rotatably connected with a threaded rod 14 that passes through the limiting plate 11 and is rotatably connected thereto, and the outer wall of each threaded rod 14 is threadedly connected with a sliding sleeve 15 that cooperates with it and slides along its length direction, and a sliding bar 2 is arranged between the two limiting plates 11 at the front and rear ends of the inner wall of the fixed frame 1 along its length direction, and a sliding block 21 that is clamped with the sliding bar 2 and is slidably connected thereto is arranged at the front and rear ends of the outer wall of each sliding sleeve 15.
[0030] An L-shaped positioning rod 16 is provided at the lower end of each sliding sleeve 15, and a fixing rod 17 is vertically provided at the lower end of each positioning rod 16. The outer walls of the two fixing rods 17 are provided with a half-sized and cylindrical expansion piece 18 along the length direction thereof, and the outer wall of each expansion piece 18 is provided with a measuring scale 19 along the height direction thereof. A first bevel gear 22 is provided at one end of each threaded rod 14 passing through the corresponding limiting piece 11, and a worm gear 23 is rotatably connected to one end on the left and right sides of the inner wall of the fixed frame 1, and a second bevel gear 24 meshing with the corresponding first bevel gear 22 is provided on one side of the outer wall of each worm gear 23. A worm 25 meshing with the corresponding worm gear 23 is rotatably connected to the left and right sides of the upper end of the fixed frame 1, and a connecting rod 26 is provided between the inner walls of the two worm gears 25. A cover body 27 for covering the worm 25 and the threaded rod 14 is provided on the left and right sides of the upper end of the fixed frame 1.
[0031] Usage: When using, sterilize the device first. In the initial state, the two sliding sleeves 15 are close to each other to the shortest distance. The medical staff holds the fixed frame 1 and the cover body 27, and inserts the two expansion pieces 18 into the wound of the patient's vertebral body that needs to be expanded. The medical staff can know the depth of the expansion piece 18 through the measuring scale 19, and then rotate the worm 25 on one side of the fixed frame 1, and the worm 25 on the other side also rotates together through the connecting rod 26, and the corresponding worm gear 23 will drive the corresponding second bevel gear 24 to rotate, and when the second bevel gear 24 rotates, it will drive the corresponding worm gear 23 through the first bevel gear 22 meshing with it. The threaded rod 14 rotates between the limiting plate 11 and the fixing ring 12. At this time, the two threaded rods 14 rotate at the same time, and the sliding sleeves 15 on the two threaded rods 14 are limited by the slider 21 and slide along the slide bar 2 and away from the fixing ring 12, and the two expansion plates 18 are separated by the fixing rod 17 on the positioning rod 16, which plays the role of separating the vertebral bodies and blocking the tissue structure. After the vertebral bodies are expanded, the medical staff can perform corresponding operations from the notch 13 at the front end of the fixing ring 12, and the gap between the two expansion plates 18 makes it convenient for the medical staff to observe the situation at the wound at any time, so as to facilitate subsequent surgical operations.
[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.
Claims
1. A vertebral body spacer, comprising a fixed frame (1) with openings at both upper and lower ends, characterized in that: The left and right sides of the inner wall of the fixing frame (1) are both provided with limit plates (11); the middle position of the front and rear ends of the inner wall of the fixing frame (1) is provided with a fixing ring (12) connected thereto; the left and right sides of the fixing ring (12) and the corresponding limit plates (11) are both rotatably connected with threaded rods (14) passing through the limit plates (11) and rotatably connected thereto; the outer wall of each threaded rod (14) is threadedly connected with a sliding sleeve (15) matched thereto; the lower end of each sliding sleeve (15) is provided with an L-shaped positioning rod (16); the lower end of each positioning rod (16) is provided with a fixing rod (17) downwardly; the outer walls of the two fixing rods (17) are both provided with a half-sized and cylindrical expansion piece (18) along the length direction thereof; A first bevel gear (22) is provided at one end of each threaded rod (14) passing through the corresponding limit plate (11); one end on both sides of the inner wall of the fixed frame (1) is rotatably connected to a worm gear (23); one side of the outer wall of each worm gear (23) is provided with a second bevel gear (24) meshing with the corresponding first bevel gear (22); a worm (25) meshing with the corresponding worm gear (23) is rotatably connected to the left and right sides of the upper end of the fixed frame (1); and a cover body (27) for covering the worm (25) and the threaded rod (14) is provided on both sides of the upper end of the fixed frame (1).
2. A vertebral body spacer according to claim 1, characterized in that: The front and rear ends of the inner wall of the fixed frame (1) are provided with sliding strips (2) along the length direction thereof between the two limiting plates (11), and the front and rear ends of the outer wall of each sliding sleeve (15) are provided with sliding blocks (21) which are engaged with the sliding strips (2) and are slidably connected thereto.
3. A vertebral body spacer according to claim 1, characterized in that: A connecting rod (26) is arranged between the inner walls of the two worms (25).
4. A vertebral body spacer according to claim 1, characterized in that: The outer wall of each opening piece (18) is provided with a measuring scale (19) along its height direction.
5. The vertebral body spacer according to claim 1, characterized in that: A notch (13) is provided downwardly through the middle position of the front end of the upper end of the fixing frame (1) and the fixing ring (12).