Vertebral pedicle directional bone grafting device
By designing the pedicle directional bone grafting device, the structure of the directional guide cylinder and push rod is used to solve the problem of bone graft entering the spinal canal without a fixed direction, and the lateral filling of bone grafting and the reduction of surgical risks is achieved.
Patent Information
- Application Number
- CN202420972888.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-08
AI Technical Summary
When filling, existing pedicle bone grafting technology can easily cause the implant to enter the spinal nerve area without a fixed direction, causing nerve damage, and substances such as solid artificial bones cannot be squeezed horizontally into the injured area, increasing the difficulty of the operation.
A pedicle-oriented bone grafting device is designed, including a directional guide barrel and a push rod. The directional guide barrel is equipped with a bone graft outlet and a funnel. The push rod has a spring head and a guide ball bead. Through these structures, the directional filling and transverse extrusion of the bone graft are achieved.
Through the design of the directional guide cylinder and push rod, the risk of implant entering the nerve area is reduced, and the lateral filling of bone grafts is achieved, which improves the safety and efficiency of the surgery.
Smart Images
Figure CN222565925U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a pedicle directional bone grafting device. Background Art
[0002] Pedicle bone grafting is to fill the damaged part of the bone with solid artificial bone or fluid bone cement. The common method is to position the pedicle on the unfractured side of the injured vertebra, first drill a hole with a screw to form an implant tunnel, and then implant the filling material from the implant tunnel to the injured vertebra and press it tightly. The current effective filling method has the following problems: First, the filling is done directly in the implant tunnel. When the implant is squeezed, the implant has no fixed direction when it is compressed and is easy to enter the spinal nerve area. Once it touches the nerve, it is easy to cause nerve damage, and severe cases directly cause paralysis. Secondly, the filling is vertical, and solid artificial bone and other materials cannot be squeezed horizontally into the injured area, which makes the operation difficult. Utility Model Content
[0003] The purpose of the utility model is to provide a pedicle directional bone grafting device to solve the above-mentioned deficiencies.
[0004] The utility model comprises a directional guide cylinder and a push rod matched with the directional guide cylinder. The directional guide cylinder is provided with an external thread. The front end of the directional guide cylinder is closed and the rear end is open. A funnel is provided on the directional guide cylinder at the open end. A bone grafting outlet is provided on the cylinder wall near the closed end. The inner bottom of the directional guide cylinder at the closed end is an inclined surface inclined toward the bone grafting outlet.
[0005] The funnel is provided with a direction mark consistent with the direction of the bone graft outlet.
[0006] A booster plate is provided on the directional guide cylinder below the funnel.
[0007] A spring head is arranged on a push rod at one end in the directional guide cylinder, and a guide ball is arranged at the end of the spring head.
[0008] The upper and lower ends of the bone graft outlet are both provided with developing blocks.
[0009] The directional guide cylinder is assembled from two sections of guide cylinders, the bone graft outlet is located on the lower section of the guide cylinder, and the upper and lower sections of the guide cylinders are threadedly connected and locked by screws.
[0010] The inner diameter of the guide cylinder at the lower section increases from top to bottom, and the inclined surface at the bottom of the guide cylinder at the lower section is an arc-shaped inclined surface.
[0011] The utility model has the advantages that the bone graft outlet of the directional guide cylinder is located at one side of the damaged part, the implant is filled in a directional manner through the bone graft outlet, the surgical risk is reduced, the spring at the front end of the push rod has a certain elasticity, the filler can be squeezed laterally into the lesion, and the surgical quality and efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the utility model.
[0013] Figure 2 2 is a schematic structural diagram of a second implementation mode of a push rod. DETAILED DESCRIPTION
[0014] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0015] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0016] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", etc. appear in the description of the present utility model, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0017] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0018] As shown in the accompanying drawings, the utility model comprises a directional guide cylinder 1 and a push rod 2 matched with the directional guide cylinder 1.
[0019] An external thread is provided on the directional guide cylinder 1. The front end of the directional guide cylinder 1 is closed and the rear end is open. A funnel 3 is provided on the directional guide cylinder 1 at the open end, and a bone graft outlet 4 is provided on the cylinder wall near the closed end. The inner bottom of the directional guide cylinder 1 at the closed end is an inclined surface inclined toward the bone graft outlet 4.
[0020] Before use, a hole is drilled on the pedicle of the unfractured side of the injured vertebra with a screw to form an implant tunnel, and then the directional guide cylinder 1 is inserted and tightened into the fracture site through its external thread. After screwing in, the bone graft outlet 4 should be facing the filling site, and then the filler is placed in the directional guide cylinder 1, and the filler is squeezed from the bone graft outlet 4 to the fracture site through the push rod 2. The inner bottom of the directional guide cylinder 1 is an inclined surface inclined toward the bone graft outlet 4, which is conducive to the extrusion of the filler toward the bone graft outlet 4. The diameter of the push rod 2 in this case is smaller than the inner diameter of the directional guide cylinder 1.
[0021] Furthermore, a direction mark 5 which is consistent with the direction of the bone graft outlet 4 is provided on the funnel 3 .
[0022] The funnel 3 and the directional guide cylinder 1 are integrally formed. When the directional guide cylinder 1 is screwed in, the direction mark 5 on the funnel 3 can intuitively see the direction of the bone graft outlet 4.
[0023] Furthermore, a booster plate 7 is provided on the directional guide cylinder 1 below the funnel 3 to facilitate the force applied to the push rod 2 during filling.
[0024] In the second embodiment of the push rod 2 , a spring head 8 is provided on the push rod 2 at one end in the directional guide cylinder 1 , and a guide ball 9 is provided at the end of the spring head 8 .
[0025] The spring head 8 has good bending performance. When the spring head 8 contacts the inclined surface of the bottom of the directional guide cylinder 1, it will bend and extend toward the lower side, that is, the bone graft outlet 4, so as to push the filler into the filling part and squeeze it tightly. The guide ball 9 is spherical and can play a guiding role, pulling the spring head 8 to smoothly enter the bone graft outlet 4.
[0026] Furthermore, both upper and lower ends of the bone graft outlet 4 are provided with developing blocks 12. The developing blocks 12 are lead blocks, and the directional guide cylinder 1 is provided with lead block mounting holes, and the lead blocks are installed in the holes. After installation, the inner wall and the outer wall of the directional guide cylinder 1 remain smooth.
[0027] After the directional guide tube 1 is screwed in, the developing block 12 can be shown under the influence of the X-ray machine, so as to facilitate observation of whether the bone graft outlet 4 reaches the designated area.
[0028] Furthermore, the directional guide cylinder 1 is assembled from two sections of guide cylinders, the bone graft outlet 4 is located on the lower section of the guide cylinder, and the upper and lower sections of the guide cylinders are threadedly connected and locked by screws.
[0029] After the filler at the fracture site is filled, the directional guide cylinder 1 is taken out, the guide cylinder section at the lower part is removed, the guide cylinder section at the upper part is screwed in again, and then the filler is directly implanted in the guide cylinder section at the upper part to fill the drilled hole on the bone. A part of it can be implanted and then a part of the guide cylinder can be screwed outward until the entire drilled hole is filled, thereby sealing the drilled hole.
[0030] Preferably, the inner diameter of the guide cylinder in the lower section increases from top to bottom, and the inclined surface at the bottom of the guide cylinder in the lower section is an arc-shaped inclined surface.
[0031] The filler is granular, and granular materials are prone to expansion and blockage after being squeezed in the straight cylinder, making it difficult to push the filler out. Therefore, in this case, the inner diameter of the lower section of the guide cylinder increases from top to bottom, which can effectively avoid expansion and blockage when pushing in.
Claims
1. A pedicle directional bone grafting device, characterized in that The invention comprises a directional guide cylinder (1) and a push rod (2) matched with the directional guide cylinder (1), wherein the directional guide cylinder (1) is provided with an external thread, the front end of the directional guide cylinder (1) is closed and the rear end is open, a funnel (3) is provided on the directional guide cylinder (1) at the open end, a bone graft outlet (4) is provided on the cylinder wall near the closed end, and the inner bottom of the directional guide cylinder (1) at the closed end is an inclined surface inclined in the direction of the bone graft outlet (4).
2. A pedicle directional bone grafting device according to claim 1, characterized in that The funnel (3) is provided with a direction mark (5) which is consistent with the direction of the bone graft outlet (4).
3. A pedicle directional bone grafting device according to claim 1, characterized in that A boosting plate (7) is provided on the directional guide cylinder (1) located below the funnel (3).
4. A pedicle directional bone grafting device according to claim 1, characterized in that A spring head (8) is provided on a push rod (2) located at one end of the directional guide cylinder (1), and a guide ball (9) is provided at the end of the spring head (8).
5. The pedicle directional bone grafting device according to claim 1, characterized in that The upper and lower ends of the bone graft outlet (4) are both provided with developing blocks (12).
6. The pedicle directional bone grafting device according to claim 1, characterized in that The directional guide cylinder (1) is assembled from two guide cylinder sections, the bone graft outlet (4) is located on the lower guide cylinder section, and the upper and lower guide cylinder sections are threadedly connected and locked by screws.
7. A pedicle directional bone grafting device according to claim 6, characterized in that The inner diameter of the guide cylinder at the lower section increases from top to bottom, and the inclined surface at the bottom of the guide cylinder at the lower section is an arc-shaped inclined surface.