Bone cement screw
By setting a cut surface and a central hole on the outer wall of the bone cement screw, the space for bone cement outflow is increased, which solves the problem of poor anti-rotation and anti-backup effects of existing bone cement screws and achieves higher stability.
Patent Information
- Application Number
- CN202422717078.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Existing bone cement screws have poor anti-rotation and anti-backup effects when implanted in osteoporosis, mainly due to the limited amount of bone cement exudate.
The outer wall of the bone cement screw is designed to have an axially penetrating section in the circumferential direction, and a center hole and multiple bone cement holes are set in the axial direction of the screw to connect the center hole and the section, thereby increasing the space for bone cement to flow out.
By increasing the space for bone cement outflow, the fixation effect between the bone cement screw and the bone is enhanced, and the stability of the anti-rotation and anti-backup screw is improved.
Smart Images
Figure CN223403941U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a bone cement screw. Background Art
[0002] Existing bone cement screws are typically conventional screws with a central through-hole through which bone cement is injected for anti-rotation fixation in osteoporosis. However, due to the screw's inherent design, the injected bone cement only seeps out of the pre-reserved hole, resulting in limited effectiveness in preventing rotation and back-out. Utility Model Content
[0003] The purpose of this application is to provide a bone cement screw to solve the problems raised in the above background technology.
[0004] To achieve the above objectives, this application provides the following technical solutions:
[0005] A bone cement screw, comprising a head, a tail, and a stem connecting the head and the tail; the outer wall of the bone cement screw is circumferentially provided with at least one cross-section axially passing through the head and the tail; an axial center hole is axially provided on the bone cement screw; and a plurality of bone cement holes are provided from the head to the tail, wherein the bone cement holes are used to connect the center hole and the cross-section.
[0006] Optionally, the number of the cut surfaces is at least three, and the multiple cut surfaces are evenly distributed along the circumference of the bone cement screw.
[0007] Optionally, each section is connected to at least one bone cement hole. When each section is connected to two or more bone cement screws, the bone cement holes are spaced apart along the longitudinal direction of the section, and the longitudinal direction of the section is coplanar with the axial direction of the bone cement screw.
[0008] Optionally, at least three bone cement holes are provided on each of the cut surfaces, and at least one bone cement hole is provided at positions corresponding to the head, the stem and the tail of the bone cement screw on each of the cut surfaces.
[0009] Optionally, external threads are provided from the head to the tail of the bone cement screw.
[0010] Optionally, the pitch of the external thread decreases from the head of the bone cement screw to the tail of the bone cement screw.
[0011] Optionally, the tail of the bone cement screw is provided with a self-tapping groove.
[0012] Optionally, the bone cement screw is a centrally symmetrical structure.
[0013] Optionally, the bone cement screw is conical, and the cross-sectional size of the bone cement screw increases sequentially from the tail to the head.
[0014] Optionally, the shape of the portion of the central hole located at the head of the bone cement screw is a regular hexagon, a square or a plum blossom.
[0015] In summary, the technical effects and advantages of the utility model are:
[0016] The outer wall of the bone cement screw of the utility model is circumferentially provided with at least one cut surface axially penetrating the head and the tail, and the cut surface has the function of preventing rotation and anti-screw withdrawal; the center hole is used for bone cement injection, and multiple bone cement holes are provided from the head to the tail, and the bone cement holes can connect the center hole and the cut surface, and bone cement can flow out through the center hole and the bone cement holes and can stay between the cut surface and the bone. Due to the existence of the cut surface, the space between the cut surface and the bone is larger than the space between the side wall of the screw without the cut surface and the bone. Therefore, the space between the bone cement screw and the bone is increased, the amount of bone cement is larger, the anti-rotation and anti-screw withdrawal effects are increased, and the stability of the bone cement screw after implantation is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 This is a schematic structural diagram of a bone cement screw in one embodiment of the present invention;
[0019] Figure 2 This is a front view of a bone cement screw in one embodiment of the present utility model;
[0020] Figure 3 A top view of a bone cement screw in one embodiment of the present invention;
[0021] Figure 4 This is a left side view of a bone cement screw in one embodiment of the present utility model;
[0022] Figure 5 This is a diagram showing the use status of a bone cement screw in one embodiment of the present invention.
[0023] in:
[0024] 01. Bone cement; 1. Head; 2. Shaft; 3. Tail; 4. Self-tapping groove; 5. Bone cement hole; 6. Center hole; 7. Cross-section. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the systems or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0029] This embodiment provides a bone cement screw, such as Figure 1-Figure 5 As shown, the bone cement screw includes a head 1, a tail 3 and a stem 2 connecting the head 1 and the tail 3. The outer wall of the bone cement screw is circumferentially provided with at least one cross-section 7 axially penetrating the head 1 and the tail 3. The bone cement screw is axially provided with an axial center hole 6. The bone cement screw is provided with multiple bone cement holes 5 from the head 1 to the tail 3. The bone cement holes 5 are used to connect the center hole 6 and the cross-section 7.
[0030] In this embodiment, the outer wall of the bone cement screw is circumferentially provided with at least one cut surface 7 axially penetrating the head 1 and the tail 3, and the cut surface 7 has anti-rotation and anti-screw withdrawal functions; the center hole 6 is used for injecting bone cement 01, and a plurality of bone cement holes 5 are provided from the head 1 to the tail 3. The bone cement holes 5 can connect the center hole 6 and the cut surface 7. The bone cement 01 can flow out through the center hole 6 and the bone cement holes 5 and can stay between the cut surface and the bone. Due to the existence of the cut surface 7, the space between the cut surface 7 and the bone is larger than the space between the side wall of the screw without the cut surface 7 and the bone. Therefore, the space between the bone cement screw and the bone is increased, the amount of bone cement is more, the anti-rotation and anti-screw withdrawal effects are increased, and the stability of the bone cement screw after implantation is enhanced.
[0031] Optionally, the number of the cut surfaces 7 is at least three, and the multiple cut surfaces 7 are evenly distributed along the circumference of the bone cement screw. When the number of the cut surfaces 7 is three, the three cut surfaces 7 make the whole similar to a triangular prism design. After the bone cement screw is screwed in, sufficient space is reserved for the bone cement 01, and the stability of the triangle is used to prevent rotation and back-out of the screw. After the bone cement screw is screwed in, the bone cement 01 is injected, as shown in FIG. Figure 5 As shown, the bone cement 01 flows into the periphery of the bone cement screw through the bone cement hole 5, which greatly increases the storage space of the bone cement 01. After the bone cement 01 solidifies, a good anti-rotation effect can be achieved.
[0032] Optionally, each section 7 is connected to at least one bone cement hole 5. When each section 7 is connected to two or more bone cement screws, the bone cement holes 5 are spaced apart along the longitudinal direction of the section 7, and the longitudinal direction of the section 7 is coplanar with the axial direction of the bone cement screw.
[0033] In this embodiment, at least three bone cement holes 5 are provided on each section 7. Each section 7 is provided with at least one bone cement hole 5 at a position corresponding to the head 1, shaft 2, and tail 3 of the bone cement screw. This allows the head 1, shaft 2, and tail 3 of the bone cement screw to be fixed with bone cement, ensuring the overall stability of the bone cement screw. Preferably, the bone cement holes 5 are evenly distributed from the head 1 to the tail 3.
[0034] Optionally, the bone cement screw is provided with external threads from the head 1 to the tail 3. Optionally, the pitch of the external threads from the head 1 to the tail 3 of the bone cement screw decreases gradually, so that the screw is continuously pressurized during the screwing process, shortening the distance of the fracture line.
[0035] Optionally, the tail portion 3 of the bone cement screw is provided with a self-tapping groove 4. The design of the self-tapping groove 4 facilitates the direct screwing in of the bone cement screw.
[0036] Optionally, the bone cement screw has a centrally symmetrical structure, which can ensure that the bone cement around the bone cement screw is distributed centrally symmetrically, thereby providing stable fixation for the bone cement screw.
[0037] Optionally, the bone cement screw is conical, and the cross-sectional size of the bone cement screw increases sequentially from the tail 3 to the head 1, so as to facilitate locking during implantation.
[0038] Optionally, the shape of the portion of the center hole 6 located at the bone cement screw head 1 is a regular hexagon, a square or a plum blossom, and the shape of the head is convenient for connecting with an implantation tool.
[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A bone cement screw, characterized in that: The bone cement screw comprises a head (1), a tail (3) and a stem (2) connecting the head (1) and the tail (3); the outer wall of the bone cement screw is circumferentially provided with at least one section (7) axially penetrating the head (1) and the tail (3); the bone cement screw is axially provided with an axial center hole (6); the bone cement screw is provided with a plurality of bone cement holes (5) from the head (1) to the tail (3); the bone cement holes (5) are used to connect the center hole (6) and the section (7).
2. The bone cement screw according to claim 1, characterized in that The number of the cut surfaces (7) is at least three, and the plurality of cut surfaces (7) are evenly distributed along the circumference of the bone cement screw.
3. The bone cement screw according to claim 2, characterized in that Each section (7) is connected to at least one bone cement hole (5); when each section (7) is connected to two or more bone cement screws, the bone cement holes (5) are spaced apart along the longitudinal direction of the section (7), and the longitudinal direction of the section (7) is coplanar with the axial direction of the bone cement screw.
4. The bone cement screw according to claim 2, characterized in that At least three bone cement holes (5) are provided on each of the cut surfaces (7), and at least one bone cement hole (5) is provided at positions corresponding to the head (1), the stem (2) and the tail (3) of the bone cement screw on each of the cut surfaces (7).
5. The bone cement screw according to claim 1, characterized in that The head (1) to the tail (3) of the bone cement screw are both provided with external threads.
6. The bone cement screw according to claim 5, characterized in that The pitch of the external thread decreases from the head (1) of the bone cement screw to the tail (3) of the bone cement screw.
7. The bone cement screw according to claim 1, characterized in that The tail portion (3) of the bone cement screw is provided with a self-tapping groove (4).
8. The bone cement screw according to claim 1, characterized in that The bone cement screw has a centrally symmetrical structure.
9. The bone cement screw according to claim 1, characterized in that The bone cement screw is conical, and the cross-sectional size of the bone cement screw increases sequentially from the tail (3) to the head (1).
10. The bone cement screw according to claim 1, characterized in that The shape of the portion of the central hole (6) located at the bone cement screw head (1) is a regular hexagon, a square or a plum blossom.