A craniomaxillofacial bone screw for orthopedic trauma

Abstract

The present invention discloses a craniomaxillofacial bone screw for orthopedic trauma, which relates to the field of medical devices, and comprises a screw rod and a screw head arranged at the end thereof, wherein the side of the screw rod is provided with a fixing thread, the screw head is provided with a rotating recessed groove, the interior of the screw rod is provided with a guide bevel groove, the inner side of the guide bevel groove is provided with a limiting rod, the bottom end of the limiting rod is provided with a drilling cone head, and the side of the limiting rod close to the drilling cone head is provided with a locking thread. The craniomaxillofacial bone screw for orthopedic trauma can be fixed inside the bone tissue through the mutual cooperation among the guiding bevel groove, the limiting rod, the drilling cone head, the locking thread and the hexagonal recessed groove, so that the bottom end of the limiting rod can be extended from the side of the screw rod body and drilled into the bone tissue, thereby limiting the rotation of the screw rod body, so that the screw rod body can provide more stable support for the broken bone tissue, which is beneficial to the healing of the bone tissue wound.

Description

Technical Field

[0001] The invention relates to medical device technology, and in particular to a craniomaxillofacial bone screw for orthopedic trauma. Background Art

[0002] A bone screw is a medical device used to treat fractures or bone wounds and promote fracture healing or bone reconstruction. It is usually made of metal (such as stainless steel, titanium alloy, etc.), designed in a long strip shape, and has a threaded outer surface. The main function of a bone screw is to pass through both ends of a fracture or bone wound during surgery and fix it in the bone through its threaded structure to provide stable support. For the craniomaxillofacial region, when a fracture trauma occurs, a bone plate and a bone screw are needed to fix the bone to promote the healing of the bone there.

[0003] During the use of bone plates and bone screws, the screws may become loose during subsequent use due to improper patient activity or insufficient new bone formation around the screws. This not only makes it impossible for the broken bones to be properly aligned or stabilized, but also causes uneven pressure distribution between the broken bones, affecting the bone healing process and increasing the risk of infection.

[0004] Therefore, the present application provides a craniomaxillofacial bone screw for orthopedic trauma to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a craniomaxillofacial bone screw for orthopedic trauma to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a craniomaxillofacial bone screw for orthopedic trauma, comprising a screw rod body and a screw head arranged at its end, the side of the screw rod body is provided with a fixing thread, the screw head is provided with a rotating countersunk groove, the interior of the screw rod body is provided with a guide bevel groove, the inner side of the guide bevel groove is provided with a limiting rod, the bottom end of the limiting rod is provided with a drilling cone head, the side of the limiting rod close to the drilling cone head is provided with a locking thread, and the end of the limiting rod away from the drilling cone head is provided with a hexagonal countersunk groove.

[0007] Furthermore, the top end of the guide groove passes through the top surface of the screw head, the bottom end of the guide groove passes through the side surface of the screw rod body and the fixed thread distributed on the central axis of the guide groove, and the limiting rod can reciprocate along the central axis of the guide groove.

[0008] Furthermore, the minimum angle between the central axis of the guiding inclined groove and the central axis of the screw rod body is 35°.

[0009] Furthermore, the guide inclined groove includes an operating port, a guide section and an auxiliary locking portion which are sequentially distributed from top to bottom, and the diameter value of the limiting rod is adapted to the inner diameter value of the guide section.

[0010] Furthermore, the inner wall of the auxiliary locking part is provided with an auxiliary thread, the locking thread is threadedly connected to the auxiliary thread, the inner diameter value of the auxiliary locking part is adapted to the outer diameter value of the locking thread, and the inner diameter value of the guide groove on the fixed thread is adapted to the outer diameter value of the locking thread.

[0011] Furthermore, a guide groove is provided inside the screw rod body, and the guide groove is coaxially arranged with the guide bevel groove. A guide block is provided at the end of the limiting rod away from the drilling cone head, and the guide block is slidably connected to the inner side surface of the guide groove, and the shape and size of the guide block are adapted to the guide groove.

[0012] Furthermore, the inner diameter of the guide groove is greater than the inner diameter of the guide bevel groove.

[0013] Furthermore, the hexagonal groove is arranged on a surface of the guide block away from the drilling cone head, and the hexagonal groove is arranged in the middle of the surface of the guide block, and the size of the hexagonal groove is smaller than the inner diameter of the operating port.

[0014] Compared with the prior art, the craniomaxillofacial bone screw for orthopedic trauma provided by the present invention has the following beneficial effects:

[0015] 1. The craniomaxillofacial bone screw for orthopedic trauma can be fixed inside the bone tissue by the mutual cooperation among the guiding bevel groove, the limiting rod, the drilling cone head, the locking thread and the hexagonal countersunk groove. The bottom end of the limiting rod can be extended from the side of the screw rod body and drilled into the bone tissue, thereby limiting the rotation of the screw rod body, so that the screw rod body can provide more stable support for the broken bone tissue, which is beneficial to the healing of the bone tissue wound.

[0016] 2. The craniomaxillofacial bone screw for orthopedic trauma cooperates with the auxiliary locking part and the auxiliary thread so that the limiting rod maintains a threaded connection with the screw rod body while drilling into the bone tissue, thereby improving the connection stability between the limiting rod and the screw rod body and thus having a good limiting effect on the screw rod body.

[0017] 3. The craniomaxillofacial bone screw for orthopedic trauma can determine the end position of the movement stroke of the limiting rod during the drilling or removal process through the mutual cooperation between the guide groove and the guide block, thereby facilitating the drilling or withdrawal of the limiting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the overall front cross-sectional structure (including the limiting rod) provided by an embodiment of the present invention;

[0021] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle;

[0022] Figure 4 A schematic diagram of the overall front cross-sectional structure (excluding the limiting rod) provided by an embodiment of the present invention;

[0023] Figure 5 The embodiment of the present invention provides Figure 4 The enlarged structural diagram at B in the middle;

[0024] Figure 6 The embodiment of the present invention provides Figure 4 The enlarged structural diagram at C in the middle;

[0025] Figure 7 A schematic diagram of a limiting rod structure provided in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Screw rod; 2. Screw head; 3. Fixed thread; 4. Rotating countersunk groove; 5. Guide inclined groove; 51. Operation port; 52. Guide section; 53. Auxiliary locking part; 6. Limiting rod; 7. Drilling cone head; 8. Locking thread; 9. Hexagonal countersunk groove; 10. Auxiliary thread; 11. Guide groove; 12. Guide block. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1:

[0030] See also Figure 1-Figure 4A craniomaxillofacial bone screw for orthopedic trauma comprises a screw rod body 1 and a screw head 2 arranged at the end thereof, a fixing thread 3 is arranged on the side of the screw rod body 1, a rotating recessed groove 4 is arranged on the screw head 2, a guide inclined groove 5 is opened inside the screw rod body 1, a limiting rod 6 is arranged on the inner side of the guiding inclined groove 5, a drilling cone head 7 is arranged at the bottom end of the limiting rod 6, a locking thread 8 is arranged on the side of the limiting rod 6 close to the drilling cone head 7, and a hexagonal recessed groove 9 is arranged on the end of the limiting rod 6 away from the drilling cone head 7.

[0031] It should be noted that the outer side surface of the drilling cone head 7 is provided with a drilling thread, and the drilling thread is an inverted tapered thread, which can effectively improve the fixation and stability of the limiting rod 6 in the bone tissue.

[0032] In this embodiment, the top end of the guide groove 5 passes through the top surface of the screw head 2, and the bottom end of the guide groove 5 passes through the side surface of the screw rod body 1 and the fixed thread 3 distributed on the central axis of the guide groove 5. The limiting rod 6 can reciprocate along the central axis direction of the guide groove 5.

[0033] It should be noted that the bottom end of the guide groove 5 passes through the side surface of the screw rod body 1 and the fixing thread 3 distributed on the central axis of the guide groove 5, so that the part of the fixing thread 3 outside the screw rod body 1 forms a complete groove or notch, so that the setting of the fixing thread 3 will not hinder the movement of the limiting rod 6.

[0034] In this embodiment, the minimum angle between the central axis of the guiding bevel groove 5 and the central axis of the screw rod body 1 is 35°, so that the top end of the guiding bevel groove 5 can be located on the screw head 2, which is convenient for tightening the limiting rod 6.

[0035] When in use, an external instrument is used to connect with the hexagonal groove 9, and squeezed toward the outside of the screw rod 1 while rotating, so that the drilling cone head 7 on the limiting rod 6 can extend to the outside of the screw rod 1, contact the bone tissue, and drill into the bone tissue during manual rotation, thereby limiting the rotation of the screw rod 1.

[0036] Embodiment 2:

[0037] See also Figure 1-Figure 7 This embodiment provides a technical solution based on the above embodiment. The guide inclined groove 5 includes an operating port 51, a guide section 52 and an auxiliary locking portion 53 which are distributed from top to bottom. The diameter value of the limiting rod 6 is adapted to the inner diameter value of the guide section 52.

[0038] In this embodiment, the inner wall of the auxiliary locking part 53 is provided with an auxiliary thread 10, the locking thread 8 is threadedly connected to the auxiliary thread 10, the inner diameter value of the auxiliary locking part 53 is adapted to the outer diameter value of the locking thread 8, and the inner diameter value of the guide groove 5 located on the fixed thread 3 is adapted to the outer diameter value of the locking thread 8.

[0039] It should be noted that when the limiting rod 6 extends outward and drills into the bone tissue, it will move along the central axis direction of the guiding bevel groove 5. Since a fixed thread 3 is provided on the outside of the screw rod body 1, when the limiting rod 6 moves, the fixed thread 3 will limit the moving distance of the limiting rod 6, so it is necessary to break the obstructing fixed thread 3.

[0040] In this embodiment, a guide groove 11 is provided inside the screw rod body 1, and the guide groove 11 is coaxially arranged with the guide inclined groove 5. A guide block 12 is provided at the end of the limiting rod 6 away from the drilling cone head 7. The guide block 12 is slidably connected to the inner side surface of the guide groove 11, and the shape and size of the guide block 12 are adapted to the guide groove 11.

[0041] In this embodiment, the inner diameter of the guide groove 11 is greater than the inner diameter of the guide bevel groove 5, so that the guide block 12 cannot withdraw from the inside of the guide groove 11. At the same time, through the restrictions on the two side ends of the guide groove 11, it is convenient to control the entry depth and withdrawal distance of the limiting rod 6 when entering or withdrawing from the bone tissue.

[0042] In this embodiment, the hexagonal groove 9 is arranged on the surface of the guide block 12 on one side away from the drilling cone head 7, and the hexagonal groove 9 is arranged in the middle of the surface of the guide block 12, and the size of the hexagonal groove 9 is smaller than the inner diameter of the operating port 51, so that when the limiting rod 6 is twisted, the external instrument can pass through the operating port 51 and connect with the hexagonal groove 9, which is convenient for twisting the limiting rod 6.

[0043] When the external instrument is connected to the hexagonal countersunk groove 9 and rotated, with the cooperation of the auxiliary thread 10, the limiting rod 6 can move to the outside of the screw rod body 1 and gradually drill into the bone tissue. In this process, the guide block 12 moves along the inside of the guide groove 11. When the guide block 12 moves to the end of the guide groove 11, the guide block 12 cannot move further, thereby facilitating the determination of the end position of the moving stroke of the limiting rod 6.

[0044] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A craniomaxillofacial bone screw for orthopedic trauma, comprising a screw rod (1) and a screw head (2) arranged at the end thereof, wherein the side of the screw rod (1) is provided with a fixing thread (3), and the screw head (2) is provided with a rotation sink groove (4), characterized in that: The screw rod body (1) is provided with a guide bevel groove (5) inside, a limiting rod (6) is provided on the inner side surface of the guide bevel groove (5), a drilling cone head (7) is provided at the bottom end of the limiting rod (6), a locking thread (8) is provided on the side of the limiting rod (6) close to the drilling cone head (7), and a hexagonal countersunk groove (9) is provided on the end of the limiting rod (6) away from the drilling cone head (7); The top end of the guide bevel groove (5) passes through the top surface of the screw head (2), the bottom end of the guide bevel groove (5) passes through the side surface of the screw rod body (1) and the fixing thread (3) distributed on the central axis of the guide bevel groove (5), and the limiting rod (6) can reciprocate along the central axis of the guide bevel groove (5); The guide inclined groove (5) comprises an operating port (51), a guide section (52) and an auxiliary locking portion (53) which are sequentially distributed from top to bottom, and the diameter value of the limiting rod (6) is adapted to the inner diameter value of the guide section (52); A guide groove (11) is provided inside the screw rod body (1), and the guide groove (11) is coaxially arranged with the guide inclined groove (5). A guide block (12) is provided at one end of the limiting rod (6) away from the drilling cone head (7), and the guide block (12) is slidably connected to the inner side surface of the guide groove (11). The shape and size of the guide block (12) are compatible with the guide groove (11), and the inner diameter of the guide groove (11) is greater than the inner diameter of the guide inclined groove (5); The hexagonal groove (9) is arranged on a surface of the guide block (12) away from the drilling cone (7), and the hexagonal groove (9) is arranged in the middle of the surface of the guide block (12), and the size of the hexagonal groove (9) is smaller than the inner diameter of the operating port (51).

2. The craniomaxillofacial bone screw for orthopedic trauma according to claim 1, characterized in that: The minimum angle between the central axis of the guiding inclined groove (5) and the central axis of the screw rod body (1) is 35°.

3. The craniomaxillofacial bone screw for orthopedic trauma according to claim 2, characterized in that: The inner wall of the auxiliary locking portion (53) is provided with an auxiliary thread (10), the locking thread (8) is threadedly connected to the auxiliary thread (10), the inner diameter value of the auxiliary locking portion (53) is matched with the outer diameter value of the locking thread (8), and the inner diameter value of the guide inclined groove (5) located on the fixing thread (3) is matched with the outer diameter value of the locking thread (8).

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