Screw for bone implantation

Abstract

The utility model discloses a screw for bone implantation. The nail comprises a rod part and a nail head part and is provided with a through hole penetrating through the rod part and the nail head part, a threaded structure is arranged on the outer side of the rod part, one end of the rod part is fixedly connected to the nail head part, the part, located at the other end of the rod part, of the through hole is a first stepped hole, and the size of the cross section of the first stepped hole is sequentially increased in the direction pointing to the nail head part. A first threading hole communicated with the first stepped hole is formed in the outer side wall of the rod part, and a second threading hole communicated with the through hole is formed in the outer side wall of the nail head part. Through the arrangement, after the rod part penetrates through the fracture line to fix the fracture of the backbone part, a plurality of fragmented epiphysis can be fixed in the mode that the suture penetrates through the first threading hole and the second threading hole, the backbone part and the fragmented epiphysis are well fixed and spliced, the application range is expanded, and the cost is saved. Through cooperation of the positioning device and the first stepped hole, inclination or deviation of the screw for bone implantation can be avoided, and the operation efficiency and the success rate are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a screw for bone implantation. Background Art

[0002] In cases of fractures accompanied by multiple epiphyseal fragments, conventional fixation requires the use of bone plates and screws. The surgery requires a complete incision for reduction, and the implant needs to be removed surgically after the fracture heals. The surgical process and product implantation process are relatively complicated and cause great trauma to the patient.

[0003] In the existing technology, in cases of fractures accompanied by epiphyseal fragmentation, hollow bone screws are used for fixation. Headless pressurized hollow screws can be completely embedded in the bone to fix the fracture site, and will not form a bulge after implantation to cause tissue irritation, thereby reducing the trauma surface and reducing the patient's pain. When fixing, hollow nail products need to pass through the fracture line to fix the fracture site. However, the existing headless pressurized hollow screws cannot perform good fixation when the epiphysis is broken into multiple pieces. In complex operations, it is difficult to introduce the screws into the correct position in the bone, and there is a risk of damaging the surrounding tissues, which affects the success rate of the operation.

[0004] Based on the above, there is an urgent need for a bone implant screw to solve the technical problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a screw for bone implantation, which can accurately fix bone shaft fractures and effectively fix multiple broken epiphyseal parts, thereby improving the scope of application and positioning accuracy, reducing the risk of damage to surrounding tissues, and improving the success rate of surgery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A screw for bone implantation, the screw for bone implantation comprises a rod and a nail head, and is provided with a through hole penetrating the rod and the nail head, the outer wall of the rod is provided with a threaded structure, one end of the rod is fixedly connected to the nail head, the through hole portion located at the other end of the rod is a first stepped hole, and the cross-sectional size of the first stepped hole increases successively along the direction pointing to the nail head, a first threading hole connected to the first stepped hole is opened on the outer wall of the rod, and a second threading hole connected to the through hole is opened on the outer wall of the nail head.

[0008] Optionally, the thread structure is a symmetrical trapezoidal thread or an asymmetrical trapezoidal thread.

[0009] Optionally, the distances between two adjacent thread crests on the thread structure are the same.

[0010] Optionally, the distances between two adjacent thread crests on the thread structure are different.

[0011] Optionally, along the direction pointing to the nail head, the distance between two adjacent thread crests on the thread structure gradually decreases.

[0012] Optionally, the cross-sectional shape of the nail head is a regular hexagon.

[0013] Optionally, the through hole portion located at the nail head position is a second stepped hole, the second stepped hole includes a first hole segment and a second hole segment, and along the direction pointing to the rod portion, the radial sizes of the first hole segment and the second hole segment decrease successively, and the second hole segment has an internal thread structure;

[0014] The bone implant screw further comprises a screw cap, which comprises an end cap portion and an external thread portion. When the external thread portion is threadedly connected to the first hole segment, the end surface of the end cap portion is flush with the end surface of the nail head portion.

[0015] Optionally, chamfers are provided at the edges of the first threading hole and the second threading hole.

[0016] Optionally, the outer wall of the rod portion is evenly provided with six first threading holes along the circumferential direction, and the outer wall of the nail head portion is evenly provided with six second threading holes along the circumferential direction.

[0017] Optionally, the bone implant screw is a titanium alloy screw or a pure tantalum screw.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model provides a screw for bone implantation. By setting a first threading hole and a second threading hole, after the rod passes through the fracture line to fix the fracture of the backbone, a part of the suture can be passed through the first threading hole and another part of the suture can be passed through the second threading hole to fix multiple fragmented epiphyses, or the sutures passing through the first threading hole and the second threading hole can be combined with a titanium plate with a lining to fix multiple fragmented epiphyses, so that the backbone and multiple fragmented epiphyses can be well fixed and spliced, the scope of application is expanded, and the cost is saved. In addition, by setting a first stepped hole, after the positioning device such as the expander passes through the bone drilling hole, it extends into the first stepped hole and is stretched in the first stepped hole. The expander can pull the bone implantation screw along the axial direction of the bone drilling hole so that it is accurately pressed into the bone drilling hole, avoiding tilting or deviation during the pressing process, thereby improving the efficiency and success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the bone implant screw provided in this embodiment;

[0021] Figure 2 An exploded view of the structure of the bone implant screw provided in this embodiment;

[0022] Figure 3 A structural cross-sectional view of the rod portion of the bone implant screw provided in this embodiment;

[0023] Figure 4 A schematic diagram of the structure of the threaded structure on the rod provided in this embodiment;

[0024] Figure 5 This is a schematic structural diagram of the threaded structure on the rod provided in other embodiments.

[0025] In the figure:

[0026] 1. Rod; 11. Threaded structure; 12. First threading hole;

[0027] 2. Nail head; 21. Second threading hole;

[0028] 3, through hole; 31, first stepped hole; 32, second stepped hole; 321, first hole section; 322, second hole section;

[0029] 4. Screw cap; 41. End cap portion; 42. External thread portion. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection 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 invention can be understood according to specific circumstances.

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0033] Combine the following Figures 1 to 5 And specific embodiments are used to introduce the technical solution provided by the utility model.

[0034] Combination Figures 1 to 3 As shown, this embodiment provides a bone implant screw, which is suitable for fracture cases accompanied by multiple fragments of the fracture epiphysis. Specifically, the bone implant screw includes a rod 1 and a nail head 2, and is provided with a through hole 3 that penetrates the rod 1 and the nail head 2, so that the bone implant screw with a hollow structure can provide a certain degree of bone healing environment after being implanted into the bone, which is convenient for the growth and reconnection of new bone tissue. One end of the rod 1 is fixedly connected to the nail head 2, and the through hole 3 located at the other end of the rod 1 has a step structure, which is set as a first step hole 31, and the cross-sectional size of the first step hole 31 increases successively along the direction pointing to the nail head 2, and a first threading hole 12 connected to the first step hole 31 is opened on the outer wall of the rod 1, and a second threading hole 21 connected to the through hole 3 is opened on the outer wall of the nail head 2.

[0035] The bone implant screw provided in the present embodiment combines the functions of the existing hollow bone screws and wire anchors. By opening a first threading hole 12 on the rod 1 and a second threading hole 21 on the screw head 2, after the rod 1 passes through the fracture line to fix the fracture of the backbone, sutures can be combined, with a part of the sutures passing through the first threading hole 12 and the other part of the sutures passing through the second threading hole 21 to fix multiple fragmented epiphyses, or the sutures passing through the first threading hole 12 and the second threading hole 21 are combined with a titanium-lined plate to fix multiple fragmented epiphyses, so that the backbone and the multiple fragmented epiphyses can be well fixed and spliced, ensuring effective bone-to-bone connection, solving the problems that the existing hollow bone screws cannot well fix multiple fragments, and the existing wire anchors are not suitable for bone fixation, thereby expanding the scope of application and saving costs.

[0036] In addition, the bone implant screw sets the through hole 3 located at the other end of the rod 1 as the first stepped hole 31, so that the surgical operator can use a positioning device such as an expander to pass through the drill hole, extend it into the first stepped hole 31, and expand it in the first stepped hole 31. Then the expander can pull the bone implant screw along the axial direction of the drill hole to accurately press it into the drill hole, avoiding tilting or displacement during the pressing process, causing damage to other adjacent cartilage tissues, thereby improving the surgical efficiency and success rate.

[0037] Furthermore, in the present embodiment, chamfers are provided at the edges of the first threading hole 12 and the second threading hole 21, thereby effectively reducing the wear on the suture and improving the service life and reliability of the suture.

[0038] In order to further promote bone fusion, the bone implant screw provided in this embodiment is integrally manufactured using titanium alloy or pure tantalum. Titanium alloy or pure tantalum has extremely high biocompatibility, good strength and toughness, and low density, and is therefore less likely to cause immune or rejection reactions in the body, thereby reducing the risk of postoperative complications, ensuring the stability and lightness of the implant, and contributing to the growth of bone cells and the regeneration of bone tissue.

[0039] refer to Figure 4 As shown, in this embodiment, the thread structure 11 on the rod 1 is a symmetrical trapezoidal thread structure. Due to its wide bottom design, it can provide a larger contact area, which helps to increase the friction between the rod 1 and the bone tissue, thereby improving the stability and long-term fixation of the bone implant screw, and can also evenly disperse the pressure between it and the bone tissue, thereby reducing local stress concentration, and further reducing the risk of fracture of the bone implant screw.

[0040] Of course, reference Figure 5 As shown, in other embodiments, the thread structure 11 on the rod 1 can also be an asymmetric trapezoidal thread structure, which can prevent the bone implant screw from coming out of the drilled bone hole and effectively fix it in the bone. Therefore, those skilled in the art can select the type of thread structure 11 according to actual working conditions, and the present invention does not limit this.

[0041] refer to Figure 4 As shown, in this embodiment, the distance between two adjacent thread crests on the thread structure 11 is the same, that is, the pitch P on the thread structure 11 is a constant, so that a stable anchoring force can be provided in the entire implantation area, thereby enhancing the overall stability of the bone implant screw and helping to ensure the healing of the fracture site.

[0042] Of course, in other embodiments, the distance between two adjacent thread crests on the thread structure 11 can also be set to be different, that is, the pitch P on the thread structure 11 is an indefinite value. For example, along the direction pointing to the nail head 2, the distance between two adjacent thread crests on the thread structure 11 gradually decreases, so that the other end of the rod 1 enters the bone faster than the nail head 2, so that the fracture surface can be pressurized when the bone implant screw is advanced.

[0043] In this embodiment, six first threading holes 12 are evenly distributed along the circumferential direction on the outer wall of the rod 1, and six second threading holes 21 are evenly distributed along the circumferential direction on the outer wall of the nail head 2, so that the surgical operator can select the most suitable hole for threading according to the specific surgical needs to achieve the best fixation effect. It can be understood that the utility model does not limit the number of the first threading holes 12 and the second threading holes 21. As long as it can ensure that the surgical operator can select the appropriate threading position as needed to improve the stability of the bone implant screw, it is within the protection scope of the utility model.

[0044] Furthermore, in this embodiment, the cross-sectional shape of the nail head 2 is a regular hexagon, thereby providing more contact area for the bone implant screw and effectively preventing it from rotating after implantation, thereby increasing the stability and firmness of the screw implanted in the bone tissue.

[0045] refer to Figure 2 As shown, the through hole 3 located at the position of the nail head 2 is also a stepped structure, and is set as a second stepped hole 32, the second stepped hole 32 includes a first hole section 321 and a second hole section 322, and along the direction pointing to the rod 1, the radial dimension of the first hole section 321 is smaller than the radial dimension of the second hole section 322, and the first hole section 321 has an internal thread structure; the bone implant screw provided in this embodiment also includes a screw cap 4, which includes an end cap portion 41 and an external thread portion 42. When the external thread portion 42 is threadedly connected in the first hole section 321, the end face of the end cap portion 41 is flush with the end face of the nail head 2, so that the nail head 2 is a planar structure after the screw cap 4 is screwed in, which not only avoids the protrusion of the screw cap 4, reduces the stimulation and pressure on the surrounding tissues, reduces discomfort, and can further improve the overall stability of the bone implant screw to prevent it from loosening.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A screw for bone implantation, characterized in that: The bone implant screw comprises a rod (1) and a nail head (2), and is provided with a through hole (3) penetrating the rod (1) and the nail head (2); the outer wall of the rod (1) is provided with a threaded structure (11); one end of the rod (1) is fixedly connected to the nail head (2); the through hole (3) located at the other end of the rod (1) is a first stepped hole (31); and the cross-sectional size of the first stepped hole (31) increases gradually along the direction pointing to the nail head (2); a first threading hole (12) connected to the first stepped hole (31) is provided on the outer wall of the rod (1); and a second threading hole (21) connected to the through hole (3) is provided on the outer wall of the nail head (2).

2. The bone implant screw according to claim 1, characterized in that: The thread structure (11) is a symmetrical trapezoidal thread or an asymmetrical trapezoidal thread.

3. The bone implant screw according to claim 1, characterized in that: The distance between two adjacent thread crests on the thread structure (11) is the same.

4. The bone implant screw according to claim 1, characterized in that: The distances between two adjacent thread crests on the thread structure (11) are different.

5. The bone implant screw according to claim 4, characterized in that: Along the direction pointing toward the nail head (2), the distance between two adjacent thread crests on the thread structure (11) gradually decreases.

6. The bone implant screw according to claim 1, characterized in that: The cross-sectional shape of the nail head (2) is a regular hexagon.

7. The bone implant screw according to claim 1, characterized in that: The through hole (3) located at the position of the nail head (2) is a second stepped hole (32), the second stepped hole (32) comprises a first hole section (321) and a second hole section (322), and along the direction pointing to the rod (1), the radial dimensions of the first hole section (321) and the second hole section (322) decrease successively, and the second hole section (322) has an internal thread structure; The bone implant screw further comprises a screw cap (4), wherein the screw cap (4) comprises an end cap portion (41) and an external thread portion (42), and when the external thread portion (42) is threadedly connected to the first hole section (321), the end surface of the end cap portion (41) is flush with the end surface of the nail head portion (2).

8. The bone implant screw according to claim 1, characterized in that: The edge of the first threading hole (12) and the edge of the second threading hole (21) are both provided with chamfers.

9. The bone implant screw according to claim 1, characterized in that: The outer wall of the rod portion (1) is evenly distributed along the circumference with six first threading holes (12), and the outer wall of the nail head portion (2) is evenly distributed along the circumference with six second threading holes (21).

10. The bone implant screw according to claim 1, characterized in that: The bone implant screw is a titanium alloy screw or a pure tantalum screw.

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