TWM652838U - spinal immobilization device - Google Patents

Abstract

This invention proposes a spinal fixation device, which has a screw, a receiving piece, a connecting piece, a fixing piece, and two flexible clips. The screw forms a through hole along the length direction of the screw. The screw has a first end and a second end. The first end forms a ring-shaped sawtooth structure. The receiving component is connected to the second end of the screw and forms an installation slot. The fixing part can be screwed into the installation groove and clamp the fixed connecting part with the receiving part. The fixing piece has an end surface. The end surface forms several recesses radially from the center of the fixing piece and abuts against the connecting piece. In this way, the screw improves the stability of screw locking through the annular sawtooth structure. The recessed portion of the end face exerts force between the fixing piece and the connecting piece, allowing the fixing piece to fix the connecting piece more firmly. The flexible clip can spread the tissue to improve the surgical field.

Description

spinal immobilization device

The invention relates to a medical device, in particular to a spinal fixation device.

The spine is an important structure that supports the human body and is composed of several vertebrae, intervertebral discs, and small joints. When the spine is damaged, such as scoliosis, disc bulge, or spondylolisthesis, the spine will fall out of its original alignment and lose stability. In medicine, the most direct and effective way is to perform spinal fixation.

In the prior art, vertebral arch screws are a commonly used spinal fixation method. The vertebral arch screws are implanted into the vertebrae, and the connectors are fixed on multiple vertebral arch screws with fixings to achieve bridging between the vertebral arch screws, thereby returning the vertebrae to their normal alignment and improving the stability of the vertebrae. .

However, in the prior art, since the end surface of the screw (vertebral arch screw) entering the vertebrae is usually a smooth surface, and the bone surface is flat, when the vertebral arch screw is to be locked into the vertebrae, the end surface of the screw is in contact with the vertebrae. The resulting lack of stability may cause the end faces of the screws to slide relative to the vertebrae, causing the locking of the vertebral arch screws to shift or require the use of other tools for stabilization. The above-mentioned problems in the prior art may reduce the correction effect of the vertebral arch screw on the spine and the stability of the correction result. On the other hand, most of today's minimally invasive spine fixation surgeries use metal sleeves that extend outside the body surface to perform vertebral arch screw surgery. However, it can only be fixed through the sleeve, and the visible field of view is limited.

In order to solve the problem of insufficient stability of vertebral arch screws, poor fixation effect of fixators and problems of operating vision, this invention proposes a spinal fixation device, which can mainly increase the contact force between the end surface of the screw and the inner vertebra, and improve the fixation. The contact force between the end connecting parts of the parts and the radial extension piece can be expanded to increase the operating field of view.

In order to achieve the above purpose, this invention proposes a spinal fixation device, which has: A screw, which forms a through hole along the length direction of the screw; the screw has a first end and a second end; the first end forms an annular sawtooth structure; A receiving piece, which is connected to the second end of the screw and forms a mounting slot; A connecting piece, which is a columnar structure and can be inserted into the installation groove; A fixing piece that can be screwed into the installation groove and clamped with the receiving piece to fix the connecting piece; the fixing piece has: An end surface, which forms a plurality of recesses radially from the center of the fixing part; when the fixing part and the receiving part clamp and fix the connecting part, the end surface abuts against the connecting part; Two flexible clips are detachably provided on the receiving member.

The spinal fixation device as mentioned above, wherein the screw includes: a front thread section extending from the first end to the second end; A rear thread section extends from the second end to the front thread section; the pitch of the rear thread section is smaller than the pitch of the front thread section.

The spinal fixation device as mentioned above, wherein the rear thread segment is a double thread, and one of the threads of the rear thread segment extends from the thread of the front thread segment.

The spinal fixation device as mentioned above, wherein the material of each flexible clip can be polystyrene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polycarbonate, aluminum , or nickel-titanium alloy.

With the above structure, the advantage of this invention is that the screw interlocks with the inside of the vertebra through the annular sawtooth structure on the first end, thereby increasing the contact area and force between the surface of the first end and the inside of the vertebra, thereby improving the screw lock. solid stability.

When the fixing part is screwed into the installation groove and clamps and fixes the connecting part with the receiving part, part of the surface of the connecting part will be embedded in the recess on the end face. This increases the force between the fixing part and the connecting part, allowing the fixing part to fix the connecting part more firmly.

The front screw section of the screw is to facilitate the screw to drill into the vertebra, and the function of the rear screw section is to prevent the screw from exiting the vertebra.

The flexible clip can bend or flex to a certain extent according to the width of the installation instrument, and can spread the tissue covering the outer layer of the spine to provide the operator with an operating field of view to facilitate the operation. .

Please refer to Figures 1 and 2. This invention proposes a spinal fixation device, which has a screw 1, a receiving member 2, a connecting member 3, a fixing member 4, and two flexible clips 5.

Please refer to FIG. 3 , the screw 1 forms a through hole 10 along the length direction of the screw 1 . The through hole 10 is used to insert a guide pin (not shown in the figure). The guide pin can be positioned at the position on the vertebra where the screw 1 is to be locked, so as to guide the screw 1 to be implanted into the vertebra, so that the screw 1 can be locked into the vertebra more accurately.

The screw 1 has a first end 11 and a second end 12 opposite to each other, and has a front thread section 13 and a rear thread section 14 . The first end 11 is the end where the screw 1 enters the vertebra and forms an annular sawtooth structure 15 (as shown in Figure 4). The second end 12 is a spherical structure. In this way, when the screw 1 is locked into the vertebrae in the length direction D, it can engage with the interior of the vertebrae through the annular sawtooth structure 15 to increase the contact area and force between the surface of the first end 11 and the interior of the vertebrae, thereby increasing the locking force of the screw 1. solid stability.

The front screw section 13 extends from the first end 11 to the second end 12 . The rear thread section 14 extends from the second end 12 to the front thread section 13 , and the pitch of the rear thread section 14 is smaller than the pitch of the front thread section 13 . In this embodiment, the rear thread section 14 is a double thread, and one of the threads of the rear thread section 14 extends from the thread of the front thread section 13 .

Please refer to FIG. 3 and FIG. 5 . The receiving member 2 is connected to the second end 12 of the screw 1 and forms a mounting slot 21 . From a side perspective, as shown in FIG. 5 , the mounting groove 21 is a U-shaped groove, and threads are formed on both inner walls 211 . From a cross-sectional perspective, as shown in FIG. 3 , the receiving member 2 forms a spherical hole 22 at the end of the connecting screw 1 to accommodate the spherical structure of the second end 12 of the screw 1 .

Please refer to Figure 3, Figure 5, and Figure 7. The connector 3 is a cylindrical structure and can be inserted into the installation groove 21. Specifically, the connecting piece 3 is placed at the arc-shaped bottom of the installation groove 21 . As shown in FIG. 7 , one connecting piece 3 can be inserted into multiple installation grooves 21 at the same time to fix and correct the arrangement and spacing between vertebrae.

Please refer to Figures 3, 5, and 6. The fixing part 4 can be screwed into the installation groove 21, and clamp the connecting part 3 with the receiving part 2 to fix it. The fixing part 4 has an end surface 41 . Several recesses 411 are formed on the end surface 41 radially from the center of the fixing member 4 (as shown in FIG. 6 ). When the fixing part 4 and the receiving part 2 clamp and fix the connecting part 3, the end surface 41 abuts the connecting part 3, and the friction between the fixing part 4 and the connecting part 3 is increased through the concave part 411, so that the fixing part 4 can be more firmly fixed. Fixed connector 3. In this embodiment, the recess 411 is a linear groove. In other embodiments, the recess 411 can be a groove of other shapes, or the end surface 41 can be other rough surfaces to increase the friction with the connecting member 3 .

Please refer to Figures 1 and 2. Two flexible clips 5 are detachably provided on the receiving member 2, extend opposite to the length direction D, and are arranged parallel to each other. The flexible clip 5 has two opposite ends. One end is detachably arranged on the receiving member 2 . A convex portion 50 is formed at the other end. The protrusions 50 of each flexible clip 5 protrude toward each other. The protruding portion 50 may be in the shape of a strip protrusion, a circular column, or a quadrangular column, but is not limited thereto. The convex part is used to cooperate with other fixtures to form a combination of multiple screw bridging.

The flexible clip 5 includes an extension section 51 , a connecting section 52 , and a final section 53 . The extension section 51 is provided at one end of the receiving member 2 by the flexible clip 5 and extends in the opposite length direction D. The extension sections 51 of each flexible clip 5 are parallel to each other. The connecting section 52 is connected to the extending section 51 and extends diagonally away from the connecting section 52 of the other flexible clip 5 . The end section 53 is connected to the connecting section 52 and is connected to the flexible clip 5 to form one end of the protruding portion 50 .

The material of the flexible clip 5 can be elastic plastic, such as polystyrene (PS), polypropylene (Phenylpropanoid, PP), polyethylene terephthalate (PET), polyurethane ( Polyurethane (PU), polytetrafluorothene (PTFE), or polycarbonate (PC), or soft metals such as aluminum and nickel-titanium alloys. The flexible clip 5 can thereby bend or flex to a certain extent. During the operation, the flexible clip 5 can be used to spread the tissue covering the outer layer of the vertebrae, thereby providing the surgical operator with an operating field of vision. for surgical operations.

When a specific installation instrument (not shown in the figure) is used to implant the screw 1 and install the connector 3 and the fixing member 4, the flexible clip 5 is used to guide the installation instrument to facilitate the implantation of the screw 1 and the installation of the connector 3 and the fixing member 4. The installation of the fixing part 4 can accurately fall into the predetermined position. At the same time, the flexible clip 5 can bend or deflect to a certain extent according to the width of the installation instrument. As shown in Figure 7, after the implantation of the screw 1 and the installation of the connecting piece 3 and the fixing piece 4 are completed, the flexible clip 5 is disassembled.

The advantage of this invention is that the screw 1 interlocks with the interior of the vertebra through the annular sawtooth structure 15 on the first end 11 to increase the contact area and force between the surface of the first end 11 and the interior of the vertebra, thereby increasing the locking force of the screw 1 solid stability.

When the fixing part 4 is screwed into the installation groove 21 and clamps and fixes the connecting part 3 with the receiving part 2 , part of the surface of the connecting part 3 will be embedded in the recess 411 on the end surface 41 . This increases the force between the fixing part 4 and the connecting part 3, so that the fixing part 4 can fix the connecting part 3 more firmly.

The front screw section 13 of the screw 1 is to facilitate the screw 1 to drill into the vertebra, and the function of the rear screw section 14 is to prevent the screw from withdrawing from the vertebra.

The flexible clip 5 can bend or flex to a certain extent according to the width of the installation instrument, and can spread the tissue covering the outer layer of the spine to provide the operator with an operating field of view to facilitate the operation.

D:Length direction 1:Screw 10:Through hole 11:First end 12:Second end 13: Front screw section 14: Rear screw section 15: Ring sawtooth structure 2: Acceptance parts 21:Installation slot 211: Medial wall 22: Spherical hole 3: Connectors 4: Fixtures 41: End face 411: concave part 5: Flexible clip 50:convex part 51:Extended section 52: Connecting section 53:Last paragraph

Figure 1 is a three-dimensional schematic diagram of this creation. Figure 2 is an exploded schematic diagram of this creation. Figure 3 is a schematic cross-sectional view of this creation. Figure 4 is a partial three-dimensional diagram of the screw of this invention. Figure 5 is a partial side view of this creation. Figure 6 is a three-dimensional schematic diagram of the fixing member of this invention. Figure 7 is a three-dimensional schematic diagram of this creation installed on the spine.

D:Length direction

1:Screw

11:First end

13: Front screw section

14: Rear screw section

2: Acceptance parts

21:Installation slot

211: Medial wall

3: Connectors

4: Fixtures

5: Flexible clip

50:convex part

51:Extended section

52: Connecting section

53:Last paragraph

Claims (6)

A spinal fixation device having: A screw, which forms a through hole along the length direction of the screw; the screw has a first end and a second end; the first end forms an annular sawtooth structure; A receiving piece, which is connected to the second end of the screw and forms a mounting slot; A connecting piece, which is a columnar structure and can be inserted into the installation groove; A fixing piece that can be screwed into the installation groove and clamped with the receiving piece to fix the connecting piece; the fixing piece has: An end surface, which forms a plurality of recesses radially from the center of the fixing part; when the fixing part and the receiving part clamp and fix the connecting part, the end surface abuts against the connecting part; Two flexible clips are detachably provided on the receiving member. The spinal fixation device of claim 1, wherein the screw includes: a front thread section extending from the first end to the second end; A rear thread section extends from the second end to the front thread section; the pitch of the rear thread section is smaller than the pitch of the front thread section. The spinal fixation device of claim 2, wherein the rear thread segment is a double thread, and one of the threads of the rear thread segment extends from the thread of the front thread segment. The spinal fixation device of claim 1, wherein the material of each flexible clip can be polystyrene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, or polycarbonate. , aluminum, or nickel-titanium alloy. The spinal fixation device according to any one of claims 1 to 4, wherein each flexible clip has two opposite ends; one end is detachably provided on the receiving member; the other end forms a convex portion; each The convex portions of the flexible clip protrude toward each other. The spinal fixation device of claim 5, wherein each flexible clip includes: An extension section, which is provided at one end of the receiving member by the flexible clip and extends in the opposite length direction; the extension sections of each flexible clip are parallel to each other; A connecting section connected to the extension section and extending diagonally away from the connecting section of the other flexible clip; An end section is connected to the connecting section and connected to the flexible clip to form one end of the convex portion.

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