A special fixation screw assembly for bone blocks

Abstract

The present invention relates to the technical field of medical devices, and in particular to a bone block fixing nail assembly, comprising a fixing rod, wherein the autogenous alveolar bone contact side of the fixing rod is provided with a first threaded portion; the transplanted bone block contact side of the fixing rod is provided with a second threaded portion; a smooth transition portion is provided between the first threaded portion and the second threaded portion; an umbrella-shaped connecting portion is provided with a receiving groove, and the extending direction of the receiving groove is consistent with the axial direction of the fixing rod; and a matching nail, wherein the matching nail comprises a connected cap body portion and a fixing member; and the fixing member is matched with the fixing groove. The present invention is not only used to fix the bone block, but also can play a certain role in supporting and stabilizing the bone formation space.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a special fixing screw assembly for bone blocks. Background Art

[0002] Currently, dental implants have become the preferred restoration method for patients with missing alveolar bone. Adequate bone stock plays a crucial role in the long-term prognosis of dental implant surgery. However, in clinical practice, jaw soft and hard tissue defects often result from trauma, inflammation, tumor resection, congenital diseases, and physiological factors, leading to severe alveolar bone deficiency, which poses a challenge to dental implant restoration. Therefore, how to effectively increase alveolar bone stock, especially vertical bone stock, is a major clinical issue that implant surgeons urgently need to address.

[0003] Autologous bone transplantation is considered the gold standard for vertical bone augmentation. However, autologous bone transplantation requires the use of autologous bone tissue, creating a second surgical site, and is therefore rejected by most patients. Compared with autologous bone blocks, freeze-dried allogeneic bone has obvious advantages: (1) It is non-immunogenic and will not cause rejection reactions, but retains osteoinductive activity, can induce new bone formation, and maintains functions similar to autologous bone; (2) According to the size of the bone defect, appropriate allogeneic bone blocks can be selected without being restricted by the donor site; (3) Allogeneic bone blocks have the same bone regeneration space as autologous bone blocks to maintain the same bone graft area; (4) Since no donor site is required, there are no complications such as donor site infection when using allogeneic bone; (5) Trauma is reduced, and the patient's postoperative reactions, such as swelling and pain, are significantly reduced; (6) Clinical operation procedures are simplified, treatment time is shortened, and patient experience is better.

[0004] Therefore, allogeneic bone blocks have been widely used in clinical practice and have achieved significant therapeutic effects, gaining high recognition from doctors and patients. However, when using allogeneic bone blocks for bone augmentation in clinical practice, there is a lack of specialized tools, which greatly increases the difficulty of clinical operation, prolongs clinical operation time, and increases technical sensitivity. Freeze-dried allogeneic bone blocks are osteoinductive and can maintain a certain bone formation space after implantation. After the bone blocks are transplanted, they need to be fixed in the bone graft area with fixing screws. At the same time, freeze-dried allogeneic bone absorbs quickly, and the bone blocks begin to absorb before the new bone is fully formed, affecting the effect of new bone formation. Summary of the Invention

[0005] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a bone block special fixing screw assembly, which can not only fix the bone block, but also play a certain role in supporting and stabilizing the bone formation space, so as to solve the problems in the prior art.

[0006] To achieve the above-mentioned and other related purposes, the present invention provides a bone block-specific retaining nail assembly, comprising a retaining rod, wherein the autogenous alveolar bone contact side of the retaining rod is provided with a first threaded portion; the transplanted bone block contact side of the retaining rod is provided with a second threaded portion; a smooth transition portion is formed between the first threaded portion and the second threaded portion; the assembly further comprises an umbrella-shaped connecting portion, wherein the umbrella-shaped connecting portion is provided with a receiving groove, and the extending direction of the receiving groove is consistent with the axial direction of the retaining rod; the assembly further comprises a matching nail, wherein the matching nail comprises a connected cap body portion and a retaining member; the retaining member cooperates with the receiving groove.

[0007] In some embodiments of the present invention, the retaining member is provided with an external thread, and the accommodating groove is provided with an internal thread that matches the retaining member.

[0008] In some embodiments of the present invention, the diameter of the umbrella-shaped connecting portion gradually increases from an end away from the retention rod to an end close to the retention rod.

[0009] In some embodiments of the present invention, the diameter of the retention rod gradually increases from an end away from the umbrella-shaped connecting portion to an end close to the umbrella-shaped connecting portion.

[0010] In some embodiments of the present invention, the cross-sectional shape of the accommodating groove is square or circular; and the retaining member is square or circular matching the shape of the accommodating groove.

[0011] In some embodiments of the present invention, the accommodating groove is provided at the center of the cross section of the umbrella-shaped connecting portion and extends in the axial direction of the umbrella-shaped connecting portion.

[0012] In some embodiments of the present invention, an angle between a working surface of the thread in the first threaded portion and a radial direction of the retaining rod is 10° to 30°.

[0013] In some embodiments of the present invention, the pitch of the first thread portion is 0.1-0.3 mm.

[0014] In some embodiments of the present invention, the length of the first threaded portion is 2 to 4 mm.

[0015] In some embodiments of the present invention, an angle between a working surface of the thread in the second threaded portion and a radial direction of the retaining rod is 10° to 30°.

[0016] In some embodiments of the present invention, the pitch of the second thread portion is 0.1-0.3 mm.

[0017] In some embodiments of the present invention, the length of the second threaded portion is 2 to 4 mm.

[0018] In some embodiments of the present invention, the cap body is provided with a slot.

[0019] In some embodiments of the present invention, the first threaded portion is a self-tapping thread.

[0020] In some embodiments of the present invention, the length of the retention rod is 10-18 mm.

[0021] In some embodiments of the present invention, the diameter of the retention rod is 1 to 2 mm.

[0022] In some embodiments of the present invention, the diameter of the umbrella-shaped connecting portion is 4 to 6 mm.

[0023] In some embodiments of the present invention, the thickness of the umbrella-shaped connecting portion is 1.5 to 2.5 mm.

[0024] In some embodiments of the present invention, the side length of the receiving groove is 0.5 to 1.5 mm.

[0025] In some embodiments of the present invention, the diameter of the cap body is 2 to 3 mm.

[0026] In some embodiments of the present invention, the thickness of the cap body is 1.5 to 2.5 mm.

[0027] In some embodiments of the present invention, the length of the nail is 3 to 5 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the split structure of the bone block special fixation screw assembly of the present invention.

[0029] Figure 2 It is a schematic diagram of the main structure of the bone block special fixing screw assembly of the present invention.

[0030] Figure 3 It is a structural schematic diagram of an accommodating groove in one embodiment of a special bone fixation screw assembly of the present invention.

[0031] Figure 4 It is a schematic structural diagram of the slotting in one embodiment of the bone block retention screw assembly of the present invention.

[0032] Component numbers in the figure:

[0033] 1 Retention rod

[0034] 11 First threaded portion

[0035] 12 Second thread portion

[0036] 13 Smooth transition

[0037] 2 Umbrella-shaped connection

[0038] 21 Receiving slot

[0039] 3. Matching nails

[0040] 31 Cap body

[0041] 311 slotting

[0042] 32 retaining parts DETAILED DESCRIPTION

[0043] In the description of the present invention, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no technical significance. Any structural modification, change in proportional relationship, or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, the directions or positional relationships indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0044] In the description of the present invention, 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 may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or 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 the present invention based on specific circumstances.

[0045] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0046] like Figure 1 and 2As shown, an embodiment of the present invention provides a bone block-specific fixing screw assembly, which includes a fixing rod 1. The autogenous alveolar bone contact side of the fixing rod 1 is provided with a first threaded portion 11; when in use, the first threaded portion 11 will be screwed into the autogenous alveolar bone. The transplanted bone block contact side of the fixing rod 1 is provided with a second threaded portion 12, which is used to screw into the transplanted bone block and fix the transplanted bone block. A smooth transition portion 13 is provided between the first threaded portion 11 and the second threaded portion 12; and an umbrella-shaped connecting portion 2 is also included, such as Figure 3 As shown, the umbrella-shaped connecting portion 2 is provided with a receiving groove 21, the extending direction of which is aligned with the axial direction of the retaining rod 1. It also includes a mounting nail 3, which comprises a connected cap portion 31 and a retaining member 32; the retaining member 32 cooperates with the receiving groove 21. During use, the retaining member 32 enters the receiving groove 21. Typically, the outer diameter of the retaining member 32 is equal to the inner diameter of the receiving groove 21, or slightly larger than the inner diameter of the receiving groove 21, to ensure a good fixation when the two are connected.

[0047] Clinically, a bone block-specific device is placed in a special tool box and disinfected for clinical use. When the bone block-specific retaining screw assembly of the present invention is used clinically, according to the size of the bone block required by the patient, the transplanted bone block is clamped with a bone holder, and the bone block is cut into the required size with a cutter, and then the transplanted bone block is trimmed into the required shape according to the morphology of the bone-deficient area. According to the needs of bone block fixation, after drilling a hole at a suitable position in the autologous alveolar bone, the appropriate bone block-specific retaining screw assembly and the depth of the retaining rod in the bone block-specific retaining screw assembly screwed into the bone tissue are determined by increasing the bone amount and the thickness of the transplanted bone block as needed. During use, the screwdriver head is placed in the receiving groove 21 of the umbrella-shaped connecting portion 2, and then the retaining screw is screwed in with force, so that the first threaded portion 11 of the retaining rod is screwed into the autologous alveolar bone, and the second threaded portion 12 is used to screw into the transplanted bone block to fix the transplanted bone block. It should be noted that the smooth transition portion 13 between the first threaded portion 11 and the second threaded portion 12 is used to accommodate bone powder; the film is covered, and finally the nails 3 are placed to fix the film. Figure 4 As shown, the cap portion 31 of the mounting nail 3 is provided with a slot 311. A dedicated nail holder is placed within the slot, allowing the retaining member 32 to be screwed into the umbrella-shaped connecting portion 2 through the receiving groove 21, thereby connecting the mounting nail 3 with the umbrella-shaped connecting portion 2 and securing the membrane. The membrane is typically very thin, and the thickness of the retaining member 32 only needs to be slightly greater than that of the receiving groove 21. The thickness direction aligns with the axial direction of the retaining rod 1. Eight months after surgery, the dedicated retaining nail assembly is removed.

[0048] In the bone block retaining screw assembly provided by the present invention, the retaining member 32 is provided with an external thread, and the receiving groove 21 is provided with an internal thread that cooperates with the retaining member 32. The cooperation of the internal and external threads allows the retaining screw 3 to be screwed into the receiving groove 21 of the umbrella-shaped connecting portion 2 through the retaining member 32, thereby connecting the retaining screw 3 to the umbrella-shaped connecting portion 2, thereby achieving membrane fixation.

[0049] In the bone block fixing screw assembly provided by the present invention, Figure 1 and 2 As shown, the diameter of the umbrella-shaped connecting portion 2 gradually increases from the end away from the retaining rod 1 to the end close to the retaining rod 1. This provides a larger contact area with the pre-implanted bone graft and a larger support area, thereby reducing the number of dedicated alveolar bone augmentation screw assemblies used.

[0050] In the bone block-specific retaining screw assembly provided by the present invention, the contact area between the cap body 31 and the biomembrane is also large enough, and the supporting area is even larger.

[0051] In the bone-retaining screw assembly provided by the present invention, the shape of the receiving slot 21 is generally not limited. For example, the cross-sectional shape of the receiving slot 21 can be square or circular. The retaining member 32 is square or circular to match the shape of the receiving slot 21. That is, if the receiving slot 21 is square, the retaining member 32 is also square.

[0052] In the bone block fixing screw assembly provided by the present invention, the receiving groove 21 is provided at the center of the cross section of the umbrella-shaped connecting portion 2 and extends in the axial direction of the umbrella-shaped connecting portion 2 .

[0053] In the bone block fixing screw assembly provided by the present invention, Figure 1 and 2 As shown, the diameter of the retaining rod 1 gradually increases from the end away from the umbrella-shaped connecting portion 2 to the end close to the umbrella-shaped connecting portion 2. The structure is more stable.

[0054] In the bone block fixing screw assembly provided by the present invention, Figure 1 and 2 As shown, the angle between the working surface of the thread in the first threaded portion 11 and the radial direction of the retention rod 1 is 10° to 30°. This design can facilitate the implantation of the retention nail assembly and reduce frictional heat generation.

[0055] In the bone-block retention screw assembly provided by the present invention, the thread pitch refers to the distance between two adjacent threads along the axial direction of the retention rod 1. Each segment of the first threaded portion 11 has an equal pitch. The pitch of the first threaded portion 11 is 0.1 to 0.3 mm. This design allows the first threaded portion 11 to exert a certain degree of compression on the alveolar bone during insertion, achieving ideal initial stability.

[0056] In the bone block fixation screw assembly provided by the present invention, the length of the first threaded portion 11 is 2 to 4 mm. In some embodiments, the length of the first threaded portion 11 can also be 2 to 3 mm, or 3 to 4 mm.

[0057] In the bone block fixing screw assembly provided by the present invention, Figure 1 and 2 As shown, the angle between the working surface of the thread in the second threaded portion 12 and the radial direction of the retaining rod 1 is 10° to 30°. This design can facilitate the implantation of the retaining membrane nail and reduce frictional heat generation.

[0058] In the bone-retention screw assembly provided by the present invention, the thread pitch refers to the distance between two adjacent threads along the axial direction of the retention rod 1. Each segment of the second threaded portion 12 has an equal pitch. The pitch of the second threaded portion 12 is 0.1 to 0.3 mm. This design allows the second threaded portion 12 to exert a certain degree of compression on the bone graft during insertion, achieving ideal initial stability.

[0059] In the bone fixation screw assembly provided by the present invention, the length of the second threaded portion 12 is 2 to 4 mm. In some embodiments, the length of the second threaded portion 12 can also be 2 to 3 mm, or 3 to 4 mm.

[0060] In the bone block fixation screw assembly provided by the present invention, the length of the fixation rod 1 can be 10 to 18 mm. In some embodiments, the length of the fixation rod 1 can be, for example, 10 to 12 mm, 12 to 14 mm, 14 to 16 mm, or 16 to 18 mm. The diameter of the fixation rod 1 can be 1 to 2 mm, 1 to 1.5 mm, or 1.5 to 2 mm.

[0061] In the bone block fixing screw assembly provided by the present invention, the fixing rod 1 has a smooth transition portion 13 outside the first threaded portion 11 and the second threaded portion 12 for placing bone powder. The length of this portion is 3 to 8 mm.

[0062] In the bone block fixing screw assembly provided by the present invention, the diameter of the umbrella-shaped connecting portion 2 can be 4 to 6 mm. In some embodiments, the diameter of the umbrella-shaped connecting portion 2 can also be 4 to 5 mm, or 5 to 6 mm.

[0063] In the bone block fixation screw assembly provided by the present invention, the thickness of the umbrella-shaped connecting portion 2 can be 1.5 to 2.5 mm. In some embodiments, the thickness of the umbrella-shaped connecting portion 2 can also be 1.5 to 2 mm; or 2 to 2.5 mm.

[0064] In the bone block fixing screw assembly provided by the present invention, the side length of the receiving groove 21 can be 0.5 to 1.5 mm. In some embodiments, the side length of the receiving groove 21 can also be 0.5 to 1.0 mm; or 1.0 to 1.5 mm.

[0065] In the bone block fixing screw assembly provided by the present invention, the thickness of the receiving groove 21 can be 1.5 to 2.5 mm. In some embodiments, the thickness of the receiving groove 21 can also be 1.5 to 2 mm; or 2 to 2.5 mm.

[0066] In the bone block fixation screw assembly provided by the present invention, the diameter of the cap body 31 can be 2 to 3 mm. In some embodiments, the diameter of the cap body 31 can also be 2 to 2.5 mm; or 2.5 to 3 mm.

[0067] In the bone block fixation screw assembly provided by the present invention, the thickness of the cap body 31 can be 1.5 to 2.5 mm. In some embodiments, the thickness of the cap body 31 can also be 1.5 to 2.0 mm; or 2.0 to 2.5 mm.

[0068] In the bone block fixation screw assembly provided by the present invention, the length of the fixing screw 3 can be 3 to 5 mm. In some embodiments, the length of the fixing screw 3 can also be 3 to 4 mm; or 4 to 5 mm.

[0069] In the bone block fixing screw assembly provided by the present invention, Figure 4 As shown, the cap body 31 is provided with a slot 311 for matching with a special nail holder.

[0070] In the bone block special fixation screw assembly provided by the present invention, the material of the bone block special fixation screw assembly is titanium alloy.

[0071] In summary, the bone block retention screw assembly of the present invention can be used to retain autologous bone blocks and allogeneic bone blocks, and can also be used to stabilize artificial bone powder. It has the following advantages:

[0072] (1) The umbrella part is enlarged, and the support area is larger, thereby reducing the number of retention screw components used.

[0073] (2) The retention screw assembly can maintain the spatial stability of the bone grafting area and improve the efficiency of bone augmentation.

[0074] (3) The retention screw assembly can effectively retain bone fragments, stabilize bone powder, and retain biofilm, with excellent results and conducive to new bone formation.

[0075] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A bone block fixing screw assembly, characterized in that: The invention comprises a retaining rod (1), wherein the autogenous alveolar bone contact side of the retaining rod (1) is provided with a first threaded portion (11); the transplant bone block contact side of the retaining rod (1) is provided with a second threaded portion (12); a smooth transition portion (13) is formed between the first threaded portion (11) and the second threaded portion (12); an umbrella-shaped connecting portion (2), wherein a receiving groove (21) is provided on the umbrella-shaped connecting portion (2), and the extending direction of the receiving groove (21) is consistent with the axial direction of the retaining rod (1); and a matching nail (3), wherein the matching nail (3) comprises a connected cap body portion (31) and a retaining member (32); and the retaining member (32) cooperates with the receiving groove (21); The angle between the working surface of the thread in the first threaded portion (11) and the radial direction of the retaining rod (1) is 10 o ~30 o The pitch of the first threaded portion (11) is 0.1-0.3 mm; the length of the first threaded portion (11) is 2-4 mm; the angle between the working surface of the thread in the second threaded portion (12) and the radial direction of the retaining rod (1) is 10 o ~30 o ; The pitch of the second threaded portion (12) is 0.1-0.3 mm; The length of the second threaded portion (12) is 2-4 mm; When in use, the screwdriver head is placed in the receiving groove (21) of the umbrella-shaped connecting part (2), and then the retaining nail is screwed in with force, so that the first threaded portion (11) of the retaining rod is screwed into the autologous alveolar bone, and the second threaded portion (12) is used to screw into the transplanted bone block to fix the transplanted bone block. The smooth transition portion (13) between the first threaded portion (11) and the second threaded portion (12) is used to accommodate bone powder.

2. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The retaining piece (32) is provided with an external thread, and the containing groove (21) is provided with an internal thread matching the retaining piece (32).

3. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The diameter of the umbrella-shaped connecting portion (2) gradually increases from an end away from the retaining rod (1) to an end close to the retaining rod (1).

4. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The diameter of the retaining rod (1) gradually increases from an end away from the umbrella-shaped connecting portion (2) to an end close to the umbrella-shaped connecting portion (2).

5. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The cross-sectional shape of the accommodating groove (21) is square or circular; the retaining member (32) is square or circular matching the shape of the accommodating groove (21).

6. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The accommodating groove (21) is arranged at the center of the cross section of the umbrella-shaped connecting portion (2), and extends in the axial direction of the umbrella-shaped connecting portion (2).

7. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The cap body (31) is provided with a slot (311).

8. The bone block-specific fixing screw assembly according to claim 1, characterized in that: The first threaded portion (11) is a self-tapping thread; And / or, the length of the retaining rod (1) is 10-18 mm; And / or, the diameter of the retaining rod (1) is 1-2 mm; And / or, the diameter of the umbrella-shaped connecting portion (2) is 4-6 mm; And / or, the thickness of the umbrella-shaped connecting portion (2) is 1.5-2.5 mm; And / or, the side length of the receiving groove (21) is 0.5-1.5 mm; And / or, the diameter of the cap body (31) is 2-3 mm; And / or, the thickness of the cap body (31) is 1.5-2.5 mm; And / or, the length of the matching nail (3) is 3-5 mm.

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