Concave titanium alloy fixing device for treating ischemic cerebrovascular disease

Abstract

The invention belongs to the technical field of medical apparatus and instruments, and discloses a concave titanium alloy fixing device for treating ischemic cerebrovascular diseases, which comprises a fixing sheet, the overall appearance of the fixing sheet is a butterfly-shaped symmetrical structure, the fixing sheet is a curved surface sheet body made of a biocompatible titanium alloy material, the surfaces of the two sides of the fixing sheet are curved surfaces bent in the same direction, and the surfaces of the two sides of the fixing sheet are curved surfaces bent in the same direction. The surface of the side, attached to the skull, of the fixing piece is a concave face, and the center of the fixing piece is sunken from the convex face side to the concave face side to form a sunken part. A plurality of fixing holes are formed in the fixing piece and evenly distributed in the surface of the fixing piece, and the inner diameter of each fixing hole is matched with the size of a screw. Through the arrangement of a butterfly-shaped symmetrical structure, the fixing piece can cover the oval bone flap, and all-directional pressing is carried out; the concave curved surface of the fixing piece is attached to the bone flap of a patient, the evenly-distributed protruding blocks provide larger and more uniform pressing force for the bone flap, the stability of the bone flap after restoration is remarkably enhanced, an STA / STF tissue bridging layer is pressed, and the postoperative healing and vascular reconstruction effects are better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a concave titanium alloy fixing device for treating ischemic cerebrovascular disease. BACKGROUND

[0002] Ischemic cerebrovascular disease refers to a class of diseases caused by stenosis or occlusion of blood vessels supplying the brain, leading to cerebral ischemia, hypoxia, and further causing brain cell damage or death. In the treatment of some ischemic cerebrovascular diseases, doctors will use modified EDAS (encephaloduroarteriosynangiosis) for indirect vascular reconstruction. The principle is to bridge the superficial temporal artery (STA) and its accompanying superficial temporal fascia (STF) tissue on the scalp to the surface of the brain cortex to promote neovascularization.

[0003] However, the traditional EDAS surgery mainly uses conventional titanium plates and screws to connect the bone flap and the skull at the suture site after the skull flap is reduced, thereby fixing the bone flap at the skull window. Usually, multiple sets of titanium plates and screws are required for fixation. However, at the current stage, the titanium plate mainly acts on the suture site, and for the modified EDAS surgery, the compression degree of the bone flap is poor, making the compression force of the bone flap on the STA / STF tissue insufficient, which makes it difficult to ensure that the bridged arterial and fascial tissue layers are stably attached to the brain surface for a long time, which can easily cause insufficient revascularization, and the bone flap or soft tissue may be slightly displaced after surgery, affecting the surgical effect. Therefore, at the current stage, there is an urgent need for a concave titanium alloy fixing device for treating ischemic cerebrovascular disease to meet the needs of the modified EDAS surgery and solve the problem of insufficient compression of the titanium plate at the current stage. SUMMARY

[0004] The present application aims to provide a concave titanium alloy fixing device for treating ischemic cerebrovascular disease to solve the problem of insufficient compression of the titanium plate at the current stage.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A concave titanium alloy fixing device for treating ischemic cerebrovascular disease, comprising a fixing sheet, the overall shape of the fixing sheet is a butterfly-shaped symmetrical structure, and two groups of notches are oppositely arranged, the fixing sheet is a curved sheet body made of biocompatible titanium alloy material with a thickness of 2-4 mm, the surfaces on both sides of the fixing sheet are curved in the same direction, the surface on one side of the fixing sheet is concave and the surface on the other side is convex, the center position of the fixing sheet is recessed from the convex side to the concave side to form a recessed part, the recessed depth of the recessed part is 1-2 mm, and a protrusion of 1-2 mm is formed on the concave side of the fixing sheet; a plurality of fixing holes are formed on the fixing sheet, the fixing holes are uniformly distributed on the surface of the fixing sheet, the inner diameter of the fixing hole is matched with the size of the screw, and a screw is arranged in each of the fixing holes on the edge of the fixing sheet

[0007] Further, a plurality of square holes are formed on the fixing sheet, and the square holes are evenly distributed on the surface of the fixing sheet and are arranged alternately with the fixing holes.

[0008] Further, the notch angle and the edge of the fixing sheet are chamfered.

[0009] Further, the screw is a self-tapping screw made of biocompatible titanium alloy.

[0010] The principle and beneficial effects of the technical solution are as follows:

[0011] The concave titanium alloy fixing device for treating ischemic cerebrovascular disease provided by the application has the advantages that: the butterfly-shaped symmetrical structure is arranged, so that the fixing sheet can well cover the elliptical bone flap and press the bone flap in all directions; meanwhile, the upper and lower notches of the fixing sheet allow the blood vessels to pass through and avoid pressing the blood vessels, so as to affect the treatment effect; the fixing sheet does not need to be fixed by using multiple titanium plates, so that the operation steps of the doctor are reduced and the efficiency is improved; the concave side of the fixing sheet is attached to the bone flap of the patient, the screw is used to pass through the corresponding circular hole, so that the fixing sheet is fixed on the bone window, the traditional fixing mode of connecting the bone gap is replaced, the bone flap is pressed in all directions, the slight displacement of the bone flap is avoided, the bone flap is provided with greater pressing force by the concave part, the stability of the bone flap after reset is significantly enhanced, the bone flap is 1-2 mm lower than the bone window, so that the artery and the tissue layer such as fascia are pressed, the bridged artery and the tissue layer such as fascia are stably attached to the brain surface for a long time, and the postoperative healing and vascular reconstruction effect are better. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a structural schematic view of the concave titanium alloy fixing device for treating ischemic cerebrovascular disease;

[0013] Figure 2 FIG. 2 is a structural schematic view of the concave side of the concave titanium alloy fixing device for treating ischemic cerebrovascular disease;

[0014] Figure 3 FIG. 3 is a front view of the concave titanium alloy fixing device for treating ischemic cerebrovascular disease;

[0015] Figure 4 FIG. 4 is a sectional view of the concave titanium alloy fixing device for treating ischemic cerebrovascular disease;

[0016] The names of the corresponding marks in the drawings are as follows: 1, fixing sheet; 2, screw; 3, fixing hole; 4, square hole; 5, notch; 6, concave part. DETAILED DESCRIPTION

[0017] The application will be further described in detail below in combination with the drawings and embodiments:

[0018] For example, Figures 1-4As shown, a concave titanium alloy fixing device for treating ischemic cerebrovascular disease includes a fixing sheet 1, which is butterfly-shaped symmetric structure as a whole, and is provided with two groups of notches 5 on the top and bottom of the fixing sheet 1. The butterfly-shaped symmetric structure can better cover the oval bone flap and adapt to the shape of the surgical wound, which is roughly hexagonal after being expanded by the expander, similar to the shape of the fixing sheet 1, so that the fixing sheet 1 can be easily placed and avoid being blocked. The bridged blood vessels pass through the notches 5 and can avoid being compressed by the fixing sheet 1, causing poor blood supply. The fixing sheet 1 is a curved sheet body with a thickness of 2-4 mm made of biocompatible titanium alloy material. The titanium alloy fixing sheet 1 with a thickness of 2-4 mm has sufficient strength to press and fix the patient's bone flap, and the doctor can adjust the radius of curvature of the fixing sheet 1 according to the actual situation using tools, so that it is more fitted to the patient's skull. At the same time, the thickness of the fixing sheet 1 will not be too thick, which is convenient for the doctor to place. The surfaces on both sides of the fixing sheet 1 are curved in the same direction, one side surface fitted to the skull is concave, and the other side is convex. The center position of the fixing sheet 1 is recessed from the convex side to the concave side to form a recessed part 6 with a recess depth of 1-2 mm. The recessed part 6 forms a 1-2 mm protrusion on the concave side of the fixing sheet 1. The 1-2 mm recessed part 6 supports the bone flap, which provides sufficient downward pressure to fully press the STA / STF tissue, and will not be excessively pressed. A plurality of fixing holes 3 are formed on the fixing sheet 1, and the fixing holes 3 are uniformly distributed on the surface of the fixing sheet 1. The inner diameter of the fixing hole 3 is matched with the size of the screw 2, and the screw 2 is a matching component of the fixing sheet 1. The plurality of fixing holes 3 at the edge of the fixing sheet 1 are provided with the screw 2. The doctor can insert the screw 2 into the fixing hole 3 at the appropriate position of the edge of the fixing sheet 1 according to the actual situation, so as to fix the fixing sheet 1, without the need for the doctor to drill holes, which is convenient for the doctor to operate.

[0019] During the operation, first, the skull is conventionally incised to form a bone flap window, and the bridging of STA and STF tissues is completed, and the superficial temporal artery is laid on the exposed cerebral cortex surface together with the surrounding superficial temporal fascia tissue. Then, an artificial dura mater patch is laid on the brain surface and hemostatic material is placed to protect the brain tissue. The previously removed bone flap is repositioned at the skull defect, aligned and fitted to the original position. The device is taken out of the sterile package, the concave side of the fixing sheet 1 is covered on the outer surface of the bone flap, the oval-shaped bone flap can be completely covered through the butterfly-shaped curved surface structure without occupying too much area, and the blood vessels pass through the two notches 5 on the fixing sheet 1 to avoid being compressed, the screws 2 are inserted into the fixing holes 3 at appropriate positions on the edge of the fixing sheet 1, and the screws 2 are gradually tightened in turn using a tool, so as to fix the fixing sheet 1 on the skull of the patient. The bone flap is pressed against the bone flap through the recess 6 on the fixing sheet 1, so that the bone flap is 1-2 mm lower than the bone window, thereby pressing the bone flap and the STA / STF tissue bridging layer below it, preventing postoperative tissue displacement, improving the stability of the superficial temporal artery and the cerebral cortex, and being more conducive to sufficient angiogenesis and fusion; improve the stability of the bone flap, significantly improve the healing quality, and promote the rapid recovery of the patient after the operation; at the same time, the doctor does not need to perform repeated operations, compared with the traditional fixing method using titanium plate connection, the operation time is shorter without significantly changing the operation habit of the doctor, the operation is simpler, and the doctor has higher acceptance.

[0020] In this embodiment, a plurality of square holes 4 are formed on the fixing sheet 1, the square holes 4 are uniformly distributed on the surface of the fixing sheet 1, and are arranged in an alternating manner with the fixing holes 3. The alternating arrangement of the square holes 4 and the fixing holes 3 can reduce the weight of the fixing sheet 1, form a grid structure, ensure the structural strength, facilitate the doctor to shape and adjust, and facilitate the doctor to observe the fitting of the fixing sheet 1 and the bone flap.

[0021] In this embodiment, the included angle of the notch 5 and the edge of the fixing sheet 1 are chamfered. The chamfered edge of the fixing sheet 1 and the included angle of the notch 5 are smoother, which avoids damage to the patient caused by edges.

[0022] In this embodiment, the screw 2 is a self-tapping screw made of biocompatible titanium alloy. The screw 2 made of biocompatible titanium alloy does not produce rejection reaction when fixed in the patient's body, and the screw 2 with self-tapping thread can be directly tapped into the skull without additional punching by the doctor, reducing the operation burden of the doctor and improving the work efficiency.

[0023] The above-mentioned are only embodiments of the present application, and common technical solutions or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A concave titanium alloy fixation device for treating ischemic cerebrovascular disease, characterized in that: The device includes a fixation plate (1), which has a butterfly-shaped symmetrical structure and two sets of notches (5) arranged opposite each other. The fixation plate (1) is a curved sheet made of biocompatible titanium alloy with a thickness of 2-4 mm. The two sides of the fixation plate (1) are curved surfaces that are bent in the same direction. The side surface that fits against the skull is concave and the other side is convex. The center of the fixation plate (1) is recessed from the convex side to the concave side to form a recessed part (6). The recessed part (6) has a depth of 1-2 mm and forms a 1-2 mm protrusion on the concave side of the fixation plate (1). The fixation plate (1) has several fixing holes (3) which are evenly distributed on the surface of the fixation plate (1). The inner diameter of the fixing holes (3) is adapted to the size of the screws (2). The screws (2) are inserted into the multiple fixing holes (3) at the edge of the fixation plate (1).

2. The concave titanium alloy fixation device for treating ischemic cerebrovascular disease according to claim 1, characterized in that: The fixing plate (1) has a plurality of square holes (4), which are evenly distributed on the surface of the fixing plate (1) and are staggered with the fixing holes (3).

3. The concave titanium alloy fixation device for treating ischemic cerebrovascular disease according to claim 1, characterized in that: The notch (5) angle and the edge of the fixing piece (1) are both rounded.

4. The concave titanium alloy fixation device for treating ischemic cerebrovascular disease according to claim 1, characterized in that: The screw (2) is a self-tapping screw made of biocompatible titanium alloy.

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