Intervertebral disc annulus opening tool for intervertebral fusion surgery

Abstract

The invention relates to an intervertebral disc annulus fiber opening tool for intervertebral fusion surgery, which effectively solves the problem that when the annulus fiber of the intervertebral disc is cut, nerve roots and spinal cord dura mater are easily damaged, thereby causing serious consequences. The lower end of the handle is connected to a side wall of a sleeve to form a hook-shaped structure, a through hole is provided in the center of the sleeve, and a side wall where the sleeve and the handle are connected is an arc-shaped side wall that is convex toward the center of the sleeve, the upper and lower sides of the arc-shaped side wall are both horizontal straight lines, and the left and right sides are curved in an arc shape, a knife body is installed in the through hole in the center of the sleeve from top to bottom, the knife body is composed of a handheld part and a knife head, the lower end of the handheld part is connected to the knife head, the knife head is an isosceles triangle arc with a tip downward, and both sides of the isosceles triangle arc are blades. The invention is easy to use, has good effect, saves time and labor, is easy to operate, and greatly improves the safety of surgical operation.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, in particular to an intervertebral disc fiber ring opening tool for intervertebral fusion surgery. Background Art

[0002] During lumbar interbody fusion surgery, a sharp blade is needed to cut the annulus fibrosus of the intervertebral disc. The operating space in this surgery is very narrow because the outer part of the annulus fibrosus is close to the nerve root. Therefore, the traditional sharp blade currently used is inserted into the annulus fibrosus from top to bottom and penetrates the annulus fibrosus, leaving an opening on the annulus fibrosus with the same shape as the sharp blade. At the same time, the sharp blade is also very likely to damage the nerve root and the spinal dura mater, thereby causing serious consequences such as cerebrospinal fluid leakage and nerve damage. It often requires experienced personnel to operate, but there are still safety hazards. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an intervertebral disc annulus fiber opening tool for intervertebral fusion surgery, which can effectively solve the problem that when cutting the annulus fiber of the intervertebral disc, it is easy to damage the nerve roots and spinal dura mater, thereby causing serious consequences.

[0004] The technical solution solved by the present invention is that the lower end of the handle is connected to a side wall of the sleeve to form a hook-like structure, a through hole is provided in the center of the sleeve, and a side wall where the sleeve and the handle are connected is an arc-shaped side wall that is convex toward the center direction of the sleeve, the upper and lower sides of the arc-shaped side wall are both horizontal straight lines, and the left and right sides are curved in an arc shape, and a knife body is installed from top to bottom in the through hole in the center of the sleeve, and the knife body is composed of a hand-held part and a knife head, and the lower end of the hand-held part is connected to the knife head, and the knife head is an isosceles triangle arc with a tip downward, and the isosceles triangle arc is an inverted isosceles triangle sheet with the isosceles triangle tip as the axis, and both sides are bent in the same direction and with the same curvature to form a triangular arc structure with an arc-shaped top edge (the same direction means that both sides of the inverted isosceles triangle sheet are bent backward or forward at the same time), and both sides of the isosceles triangle arc are blades.

[0005] The present invention is easy to use, has good effects, saves time and effort, is easy to operate, and greatly improves the safety of surgical operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is the structural front view of the present invention.

[0007] Figure 2 It is a structural top view (enlarged) of the knife body of the present invention.

[0008] Figure 3 FIG. 1 is a structural top view (enlarged) of another embodiment of the knife body of the present invention.

[0009] Figure 4 It is a structural front view of another embodiment of the present invention.

[0010] Figure 5 It is the structural rear view of the cutter head of the present invention (enlarged). DETAILED DESCRIPTION

[0011] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0012] Depend on Figure 1-Figure 5 The structure of the present invention is that the lower end of the handle 1 is connected to a side wall of the sleeve 2 to form a hook-like structure, a through hole 3 is provided in the center of the sleeve, and a side wall where the sleeve and the handle are connected is an arc-shaped side wall 4 which is convex toward the center of the sleeve, the upper and lower sides of the arc-shaped side wall are both horizontal straight lines, and the left and right sides are curved in an arc shape, and a knife body is installed from top to bottom in the through hole in the center of the sleeve, and the knife body is composed of a hand-held part 5 and a knife head 6, the lower end of the hand-held part is connected to the knife head, and the knife head is an isosceles triangle arc with the tip downward, and the isosceles triangle arc is an inverted isosceles triangle sheet with the isosceles triangle tip as the axis, and the two sides are bent in the same direction and with the same curvature to form a triangular arc structure with an arc-shaped top edge (the same direction means that the two sides of the inverted isosceles triangle sheet are bent backward or forward at the same time), and both sides of the isosceles triangle arc are blades.

[0013] The corners around the upper part and the corners around the lower part of the sleeve 2 are processed into arc shapes.

[0014] The hand-held part 5 is a square or round rod-shaped body.

[0015] The lower end of the hand-held portion 5 is fixed to the middle of the upper end of the cutter head (such as Figure 3 The lower end of the handle is connected to one end of three horizontal or downwardly inclined radially arranged support rods 7, and the other ends of the three support rods are fixed to the upper ends of the cutter head and the center of the upper end of the cutter head (as shown in FIG. Figure 2 as shown).

[0016] When the lower end of the hand-held portion 5 is connected to one end of the three support rods 7, the lower end of the hand-held portion is placed at the arc center of the top edge of the cutter head.

[0017] The angle A between the two side edges of the cutter head 6 is 60°≤A≤120°.

[0018] The handle 1 is in an inverted L-shape, and the L-shaped bending angle B of the handle is 90°≤B≤120°.

[0019] The lower end of the handle 1 is connected to the upper surface of the sleeve in a vertical state.

[0020] The other side wall corresponding to the arc-shaped side wall of the sleeve 2 is an arc-shaped wall convex toward the center of the sleeve (such as Figure 4 as shown).

[0021] The curvature of one side wall where the sleeve 2 and the handle are connected is greater than the curvature of the other side wall of the corresponding sleeve.

[0022] When in use, an incision is made at the site where lumbar intervertebral fusion surgery is required, and the retractor of the present invention is used to push away the protected nerve root to expose the surface of the annulus fibrosus. Since one side wall of the sleeve connected to the handle in the present invention is an arc-shaped side wall, at this time, the sleeve can be pushed to block the nerve root from entering the central through hole of the sleeve with the arc-shaped side wall, and can also play the role of pushing away many soft tissues at the incision. Then, the hand-held part of the knife body is pinched, and the knife head is inserted downward from the central through hole of the sleeve, so that the tip of the knife head pierces the annulus fibrosus below the through hole. When the tip of the knife head pierces the annulus fibrosus, the downward piercing action can be stopped, and the hand-held part is rotated to rotate the knife head, so that the annulus fibrosus below the through hole can be easily and quickly cut off. The present invention is not only convenient and fast to use, but also easy to operate, safe and reliable, and avoids potential safety hazards. The present invention is a combination type used in combination with a retractor and a knife body, which is divided into a retractor with a channel for protecting the nerve root and a rotatable arc-shaped knife head (i.e., an isosceles triangle arc) for cutting the annulus fibrosus. The retractor can pull the nerve root to one side, the surface of the annulus fibrosus can be observed from the end of the through hole, and the rotatable arc-shaped blade can be used to easily cut the tough annulus fibrosus under the protection of the through hole. The present invention is more convenient and quick to use than the traditional sharp blade and greatly improves the safety of operation, with huge economic and social effects.

Claims

1. A disc fiber ring opening tool for intervertebral fusion surgery, characterized in that: The lower end of the handle (1) is connected to a side wall of the sleeve (2) to form a hook-like structure. The center of the sleeve has a through hole (3). The side wall where the sleeve and the handle are connected is an arc-shaped side wall (4) that is convex toward the center of the sleeve. The upper and lower sides of the arc-shaped side wall are both horizontal straight lines, and the left and right sides are curved to form an arc. A knife body is installed in the through hole in the center of the sleeve from top to bottom. The knife body is composed of a hand-held part (5) and a knife head (6). The lower end of the hand-held part is connected to the knife head. The knife head is an isosceles triangle arc with a downward tip. The isosceles triangle arc is an inverted isosceles triangle sheet with the tip of the isosceles triangle as the axis. The two sides are bent in the same direction and with the same curvature to form a triangular arc structure with an arc-shaped top edge. Both sides of the isosceles triangle arc are blades. The lower end of the handheld portion is respectively connected to one end of three support rods (7) arranged horizontally or downwardly inclined and radially, and the other ends of the three support rods are respectively fixed to both sides of the upper end of the cutter head and the center of the upper end of the cutter head; When the lower end of the hand-held portion (5) is connected to one end of the three support rods (7), the lower end of the hand-held portion is placed at the center of the arc at the top edge of the blade head; The handle (1) is in an inverted L-shape, and the L-shaped bending angle B of the handle is 90°≤B≤120°; The lower end of the handle (1) and the upper surface of the sleeve are connected in a vertical state.

2. The intervertebral disc annulus fiber opening tool for intervertebral fusion surgery according to claim 1, characterized in that: The corners around the upper part and the corners around the lower part of the sleeve (2) are processed into arc shapes.

3. The intervertebral disc annulus fiber opening tool for intervertebral fusion surgery according to claim 1, characterized in that: The hand-held portion (5) is a square or round rod-shaped body.

4. The intervertebral disc annulus fiber opening tool for intervertebral fusion surgery according to claim 1, characterized in that: The included angle A of the two side edges of the cutter head (6) is 60°≤A≤120°.

Images