Skull flap fixator

Abstract

The utility model provides a skull bone flap fixator which comprises a connecting piece and skull screws, the connecting piece comprises a connecting bridge and connecting parts arranged at the two ends of the connecting bridge, and fixing holes are formed in the connecting parts; the width of the connecting bridge is not larger than that of the fixing hole, one face of the connecting bridge is provided with an arc face, and the other face, away from the arc face, of the connecting bridge is provided with a bent face. The skull screws are correspondingly arranged in the fixing holes in a penetrating mode, and the number of the skull screws does not exceed the number of the fixing holes. A first fillet is arranged at the joint of the bent surface and the cambered surface and the connecting part, and a second fillet is arranged at the bent part of the bent surface; the connecting piece can solve the problems that the contour line of the connecting piece used for fixing the bone flap in the prior art is a straight line, the connecting piece cannot adapt to the arc-shaped contour line of the skull, the connecting piece cannot be attached to the surface of the bone flap during installation and fixation, and the fixing effect is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of fixing parts, in particular to a skull bone flap fixator. Background Technique

[0002] Clinically, in the treatment of brain diseases, craniotomy has become a common treatment method. During craniotomy, free bone flaps often occur and medical devices need to be implanted for bone flap fixation. Commonly used medical devices are titanium nails, absorbable skull locks, etc. To simplify the surgical operation and meet the fixation effect, skull fixation devices have become commonly used skull fixation instruments.

[0003] In order to avoid premature fracture caused by galvanic corrosion due to different electrode potentials, existing skull fixation instruments use magnesium materials with the same composition to prepare skull screws and bone plates. For example, the utility model with the application publication number CN219021471U discloses a degradable magnesium metal skull fixation device (hereinafter referred to as the prior art 1), a degradable magnesium metal skull fixation system, including a long strip-shaped connecting piece and skull screws. The connecting piece includes a connecting bridge and fixing holes arranged at both ends of the connecting bridge. The skull screws are correspondingly inserted into the fixing holes of the connecting piece, and the skull screws and the connecting piece are made of different grades of pure magnesium or magnesium alloy.

[0004] Although the prior art 1 uses a controllable degradation and absorption magnesium alloy as the material for the connecting piece and skull screws to avoid premature fracture caused by galvanic corrosion due to different electrode potentials; however, the contour line of the connecting piece used to fix the bone flap in the prior art 1 is a straight line, which cannot adapt to the arc contour line of the skull, and cannot be attached to the surface of the bone flap during installation and fixation, resulting in a poor fixation effect. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a skull bone flap fixator, which can solve the problem in the prior art that the contour line of the connecting piece used to fix the bone flap is a straight line, which cannot adapt to the arc contour line of the skull, and cannot be attached to the surface of the bone flap during installation and fixation, resulting in a poor fixation effect during the actual use process.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A skull bone flap fixator, including a connecting piece and skull screws. The connecting piece includes a connecting bridge and connecting parts arranged at both ends of the connecting bridge. Fixing holes are arranged on the connecting parts;

[0008] The width of the connecting bridge is not greater than the width of the fixing hole. An arc surface with a bending curvature is provided on the lower end surface of the connecting bridge, and a bending surface is provided on the upper end surface of the connecting bridge; the skull screw is correspondingly inserted into the fixing hole, and the number of the skull screws does not exceed the number of the fixing holes;

[0009] A first rounded corner is provided at the connection between the bending surface and the arc surface and the connecting portion, and a second rounded corner is provided at the bending portion of the bending surface.

[0010] Preferably, the fixing hole includes a first outer hole and a first inner hole. The first outer hole and the first inner hole are sequentially communicated and coaxially arranged, and the diameter of the first outer hole is larger than the diameter of the first inner hole.

[0011] Preferably, the first outer holes are symmetrically arranged at the upper and lower ends of the first inner hole.

[0012] Preferably, a positioning hole is provided on the connecting piece, and the positioning hole is coaxially arranged with the fixing hole.

[0013] Preferably, the positioning hole and the fixing hole have the same diameter. The positioning hole includes a second outer hole and a second inner hole. The second outer hole and the second inner hole are sequentially communicated and coaxially arranged, and the diameter of the second outer hole is larger than the diameter of the second inner hole.

[0014] Preferably, the second outer holes are symmetrically arranged at the upper and lower ends of the second inner hole.

[0015] Preferably, grooves are symmetrically arranged on the front and rear sides of the connecting bridge.

[0016] Preferably, the skull screw includes a screw head and a screw tail fixedly connected to the screw head. A flat groove, a cross groove or an internal hexagonal groove is provided on the upper surface of the screw head.

[0017] Preferably, both the skull screw 102 and the connecting piece 101 are made of one of pure magnesium, titanium alloy and polyetheretherketone.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] In the utility model, an arc surface with a bending curvature is provided on the lower end surface of the connecting bridge. When the connection between the bone flap and the skull is on the same arc surface, by providing the arc surface, the connecting bridge can better fit with the bone flap when being fixed by the skull screw after contacting the skull bone flap, and the fixing effect on the bone flap is better than that of the connecting piece with a straight contour line in the prior art;

[0020] The skull is composed of multiple bone flaps. At the joints where the bone flaps are connected, or near the areas on the skull where nerves and blood vessels pass through, there may be depressions or protrusions. During the process of fixing the skull bone flaps, if there are depressions or protrusions at the connection between the bone flaps and the skull and they are not on the same arc surface, by making the bending surface fit with the skull bone flap and then fixing the skull bone flap with the skull screw, the fixing effect of the connecting piece on the bone flap can be further improved, and the applicability of the connecting piece can be further enhanced. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a three-dimensional view of the connecting piece in the present invention.

[0023] Figure 2 It is a structural schematic diagram of the skull screw in the present invention.

[0024] Figure 3 It is a schematic diagram of the connection relationship between the connecting piece and the skull screw in the present invention.

[0025] In the drawings, the list of components represented by each reference numeral is as follows:

[0026] 101 - connecting piece, 102 - skull screw, 103 - connecting bridge, 104 - connecting part, 105 - fixing hole, 106 - arc surface, 107 - bending surface, 108 - first outer hole, 109 - first inner hole, 110 - positioning hole, 111 - second outer hole, 112 - second inner hole, 113 - nail head, 114 - nail tail. Detailed Embodiments

[0027] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0028] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by terms such as "length", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present utility model.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0030] In the embodiments of the present utility model, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0031] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0032] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present utility model. To simplify the disclosure of the embodiments of the present utility model, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0034] Refer to Figures 1 - 3 , this embodiment discloses a fixator for fixing a cranial bone flap, specifically a cranial bone flap fixator, which includes a connecting piece 101 and cranial screws 102. The connecting piece 101 includes a connecting bridge 103 and connecting parts 104 provided at both ends of the connecting bridge 103. Fixing holes 105 are provided on the connecting parts 104;

[0035] The width of the connecting bridge 103 is not greater than the width of the fixing hole 105. An arc surface 106 with a curved arc is provided on the lower end surface of the connecting bridge 103, and a bending surface 107 is provided on the upper end surface of the connecting bridge 103; the cranial screws 102 are correspondingly inserted into the fixing holes 105, and the number of the cranial screws 102 does not exceed the number of the fixing holes 105;

[0036] First rounded corners are provided at the joints of the bending surface 107 and the arc surface 106 with the connecting part 104, and a second rounded corner is provided at the bending part of the bending surface 107.

[0037] In the present utility model, the width of the connecting bridge 103 is less than the width of the fixing hole 105. An arc surface 106 with a curved arc is provided on the lower end surface of the connecting bridge 103. When the joint between the bone flap and the skull is on the same arc surface 106, by providing the arc surface 106, the connecting bridge 103 can better fit the bone flap when being fixed by the cranial screws 102 after contacting the cranial bone flap, and the fixing effect on the bone flap is better than that of the connecting piece 101 with a straight contour line in the prior art; the skull is composed of multiple bone flaps, and there will be depressions or protrusions at the joints between the bone flaps or near the areas on the skull where nerves and blood vessels pass; during the process of fixing the cranial bone flap, if there are depressions or protrusions at the joint between the bone flap and the skull and they are not on the same arc surface 106, by making the bending surface 107 fit the cranial bone flap and then fixing the cranial bone flap with the cranial screws 102, the fixing effect of the connecting piece 101 on the bone flap can be further improved, and the applicability of the connecting piece 101 can be further improved.

[0038] In some embodiments, the fixing hole 105 includes a first outer hole 108 and a first inner hole 109. The first outer hole 108 and the first inner hole 109 are sequentially communicated and coaxially arranged, and the diameter of the first outer hole 108 is larger than that of the first inner hole 109. A stepped hole structure is formed between the first outer hole 108 and the first inner hole 109. When the skull screw 102 and the fixing hole 105 cooperate to fix the connecting piece 101, the stepped hole structure plays a role of making way, so that the skull screw 102 can be completely embedded in the fixing hole 105, further improving the stability after the connection of the skull screw 102.

[0039] In some embodiments, the first outer holes 108 are symmetrically arranged at the upper and lower ends of the first inner hole 109. Two stepped hole structures for making way for the skull screw 102 are formed between the first outer holes 108 arranged at the upper and lower ends of the first inner hole 109 and the first inner hole 109. When any upper or lower end face of the connecting piece 101 contacts the skull bone flap as required by the actual situation, the skull screw 102 can be completely embedded in the fixing hole 105, further improving the stability after the connection of the skull screw 102. In this embodiment, the ratio range of the diameter of the first inner hole 109 to the diameter of the first outer hole 108 is 80% - 85%.

[0040] In some embodiments, a positioning hole 110 is provided on the connecting piece 101, and the positioning hole 110 is coaxially arranged with the fixing hole 105. The positioning hole 110 is arranged between two fixing holes 105 and is coaxially arranged with the fixing hole 105. After the positioning hole 110 and the skull screw 102 cooperate, the connecting piece 101 can be further fixed.

[0041] In some embodiments, the diameter of the positioning hole 110 is equal to that of the fixing hole 105. The positioning hole 110 includes a second outer hole 111 and a second inner hole 112. The second outer hole 111 and the second inner hole 112 are sequentially communicated and coaxially arranged, and the diameter of the second outer hole 111 is larger than that of the second inner hole 112. In this embodiment, a stepped hole structure is formed between the second outer hole 111 and the second inner hole 112. When the skull screw 102 and the fixing hole 105 cooperate to fix the positioning hole 110, the stepped hole structure plays a role of making way, so that the skull screw 102 can be completely embedded in the positioning hole 110, further improving the stability after the connection of the skull screw 102

[0042] In some embodiments, the second outer holes 111 are symmetrically arranged at the upper and lower ends of the second inner hole 112. Two stepped hole structures for making way for the cranial screw 102 are formed between the second outer holes 111 arranged at the upper and lower ends of the second inner hole 112 and the second inner hole 112; when any upper or lower end face of the connecting piece 101 contacts the cranial bone flap as required according to the actual situation, the cranial screw 102 can be completely embedded in the positioning hole 110, further improving the stability after the connection of the cranial screw 102. In this embodiment, the ratio range of the diameter of the second inner hole 109 to the diameter of the second outer hole 108 is 80% - 85%.

[0043] In some embodiments, grooves are symmetrically arranged on the front and rear sides of the connecting bridge 103. During the process of fixing the bone flap through the connecting piece 101 and the cranial screw 102, the grooves are arranged to facilitate the clamping and positioning of the connecting piece 101.

[0044] In some embodiments, the cranial screw 102 includes a screw head 113 and a screw tail 114 fixedly connected to the screw head 113. A slotted cross recess, a Phillips recess or an internal hexagonal recess is arranged on the upper surface of the screw head 113. In this embodiment, a slotted cross recess is arranged on the upper surface of the screw head 113. Through the slotted cross recess, it is convenient to rotate the screw head 113 and the screw tail 114, so that the screw tail 114 is screwed into the skull under the drive of the screw head 113 to fix the connecting piece 101.

[0045] In some embodiments, both the cranial screw 102 and the connecting piece 101 are made of one of pure magnesium, titanium alloy and polyetheretherketone.

[0046] In this embodiment, both the cranial screw 102 and the connecting piece 101 are made of titanium alloy. The connecting piece 101 and the cranial screw 102 made of titanium alloy have good biocompatibility, are not easy to rust and can reduce the body's rejection reaction.

[0047] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cranial bone flap fixator, characterized in that: It includes a connecting piece (101) and a skull screw (102). The connecting piece (101) includes a connecting bridge (103) and connecting parts (104) arranged at both ends of the connecting bridge (103). Fixing holes (105) are arranged on the connecting parts (104). The width of the connecting bridge (103) is not greater than the width of the fixing holes (105). An arc surface (106) with a bending arc is arranged on the lower end surface of the connecting bridge (103), and a bending surface (107) is arranged on the upper end surface of the connecting bridge (103). The skull screw (102) is correspondingly inserted into the fixing holes (105), and the number of the skull screws (102) does not exceed the number of the fixing holes (105). First round corners are arranged at the joints of the bending surface (107) and the arc surface (106) with the connecting part (104), and a second round corner is arranged at the bending part of the bending surface (107).

2. The cranial bone flap fixator according to claim 1, wherein: The fixing holes (105) include a first outer hole (108) and a first inner hole (109). The first outer hole (108) and the first inner hole (109) are sequentially communicated and coaxially arranged, and the diameter of the first outer hole (108) is greater than the diameter of the first inner hole (109).

3. The cranial bone flap fixator according to claim 2, characterized in that: The first outer holes (108) are symmetrically arranged at the upper and lower ends of the first inner hole (109).

4. A skull bone flap fixator according to claim 1, characterized in that: Positioning holes (110) are arranged on the connecting piece (101), and the positioning holes (110) are coaxially arranged with the fixing holes (105).

5. The skull bone flap fixator according to claim 4, characterized in that: The positioning holes (110) have the same diameter as the fixing holes (105). The positioning holes (110) include a second outer hole (111) and a second inner hole (112). The second outer hole (111) and the second inner hole (112) are sequentially communicated and coaxially arranged, and the diameter of the second outer hole (111) is greater than the diameter of the second inner hole (112).

6. The cranial bone flap fixator according to claim 5, wherein: The second outer holes (111) are symmetrically arranged at the upper and lower ends of the second inner hole (112).

7. A cranial bone flap fixator according to claim 1, characterized in that: Grooves are symmetrically arranged on the front and back sides of the connecting bridge (103).

8. A skull bone flap fixator according to claim 1, characterized in that: The skull screw (102) includes a screw head (113) and a screw tail (114) fixedly connected to the screw head (113). A flat groove, a cross groove or an internal hexagonal groove is arranged on the upper surface of the screw head (113).

9. The cranial bone flap fixator according to claim 1, wherein: Both the skull screw (102) and the connecting piece (101) are made of one of pure magnesium, titanium alloy and polyetheretherketone.

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