CN210541780U

CN210541780U - Spine fixing device

Info

Publication number: CN210541780U
Application number: CN201920558447.9U
Authority: CN
Inventors: 姜舒婷; 刘三; 鲍野
Original assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Current assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-05-19
Anticipated expiration: 2029-04-23

Abstract

The utility model discloses a spinal fixation device relates to medical instrument technical field. The vertebral column fixing device comprises a connecting rod and a vertebral pedicle screw, wherein the vertebral pedicle screw comprises a screw rod, a screw head and a connecting head, and external threads are arranged on the screw rod and are used for being connected with a vertebral pedicle; the screw head is connected with the screw rod, the middle part of the screw head is provided with a first rod placing part, two opposite side walls are arranged on two sides of the first rod placing part, and at least one side wall is provided with a guide rail arranged along the axial direction of the screw head; the connecting head is matched and connected with the guide rail on the screw head, a second rod placing part is arranged on the connecting head and used for installing a connecting rod, and the connecting rod installed on the second rod placing part is basically parallel to the connecting rod installed on the first rod placing part; the screw head cap is connected with one end of the screw head far away from the screw rod, and the connecting head can be limited to be separated from the screw head. The utility model discloses a pedicle of vertebral arch screw among the backbone fixing device can connect a plurality of connective bars, and is fixed more stable, and the postoperative resumes effectually.

Description

Spine fixing device

Technical Field

The utility model belongs to the technical field of medical instrument, especially, relate to a spine fixing device.

Background

The spinal fixation system is useful for treating scoliosis, lumbar spondylolisthesis, degeneration, intervertebral disc disease, vertebral fracture and other spinal disease disorders or abnormalities. In many cases, for example, spinal fixation devices include one or more pedicle screws, connecting rods, cross-links, and the like. Generally, two adjacent pedicle screws along the length direction of the spine are connected through only one connecting rod, so that the fixing effect is poor, the postoperative recovery effect is poor, and even the operation failure is easily caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a spinal fixation device, a plurality of connective bars of accessible are connected between two adjacent pedicle of vertebral arch screws, and fixed effectual, orthopedic cycle shortens, and the operation resumes effectually.

A spinal fixation device comprising a connector rod and a pedicle screw, the pedicle screw comprising:

the screw rod is provided with external threads and is used for being connected with the vertebral pedicle;

the screw head is connected with the screw rod, a first rod placing part for installing a connecting rod is arranged in the middle of the screw head, two opposite side walls are arranged on two sides of the first rod placing part, and a guide rail arranged along the axial direction of the screw head is arranged on at least one side wall;

the connector is matched and connected with the guide rail on the screw head, a second rod placing part is arranged on the connector and used for installing a connecting rod, and the connecting rod installed on the second rod placing part is basically parallel to the connecting rod installed on the first rod placing part;

the screw head cap is connected with one end, far away from the screw rod, of the screw head and can limit the connecting head to be separated from the screw head.

Preferably, in the above technical solution, the guide rail is a sliding groove formed in an end surface of one end of the screw head, which is far away from the screw rod, along an axial direction of the screw head.

Above technical scheme is preferred, set up two symmetrical spouts on a lateral wall of screwhead, be provided with two beads on the connector, two the bead is connected with two on this lateral wall the spout respectively.

Preferably, in the above technical solution, the screw head is in threaded connection with the nail head cap.

Above technical scheme is preferred, two lateral walls of screwhead are kept away from the one end of screw rod is provided with locking external screw thread, the pin fin cap includes top cap and side ring, be provided with in the side ring with locking external screw thread complex locking internal thread.

Above technical scheme is preferred, first putting excellent portion including being used for placing the connective bar first put excellent hole and the first fixed orifices that is used for placing locking screw, first fixed orifices with first putting excellent hole intercommunication and set up in the first top of putting excellent hole, the first axis perpendicular to of putting excellent hole the axis of first fixed orifices, first fixed orifices threaded connection has locking screw, locking screw can with the connective bar is fixed in first putting excellent downthehole.

Above technical scheme is preferred, excellent portion is put including the second to excellent hole and second fixed orifices to the second, the second fixed orifices is located the second is put one side of excellent hole, the axis perpendicular to of second fixed orifices the axis in excellent hole is put to the second, threaded connection has in the second fixed orifices can lock the locking screw of connective bar.

In the above preferred technical solution, the number of the second rod placing holes and the number of the second fixing holes are at least two, and the second rod placing holes and the second fixing holes are arranged in a one-to-one correspondence manner.

Preferably, in the above technical solution, the second rod placing holes are round holes, and the aperture of each second rod placing hole is different from the apertures of the other second rod placing holes.

Above technical scheme is preferred, be provided with the external screw thread on the screw pole, keep away from the screwhead the pitch of external screw thread is greater than be close to the screwhead the pitch of external screw thread.

The utility model has the advantages and positive effects that: the spinal fixation device that this embodiment provided connects connector 3 through the one side at the screwhead 2 of pedicle of vertebral arch screw, is equipped with the second on the connector 3 and puts excellent portion, and the second is put excellent portion and can be connected 1, 2 or a plurality of connective bars as required, and the connective bar combined action of being connected with first putting excellent portion can improve orthopedic power, makes orthopedic cycle shorten, and the operation resumes effectually.

Drawings

FIG. 1 is a schematic structural view of a spinal fixation device (the connecting rod is not shown) provided by the present invention;

FIG. 2 is a schematic structural view of a screw shaft provided in the present invention;

fig. 3 is a schematic structural view of the screw head provided by the present invention;

fig. 4 is a schematic structural diagram of a connecting head provided by the present invention;

fig. 5 is a schematic structural view of the nail head cap provided by the present invention.

Wherein: 1. a screw shaft; 2. a screw head; 3. a connector; 4. an external thread; 5. a U-shaped groove; 6. a second rod placing hole; 7. a second fixing hole; 8. a nail head cap; 9. a guide rail; 10. locking the internal thread; 11. a first fixing hole; 12. a rib; 13. and locking the external thread.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The spinal fixation device of the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments.

The existing pedicle screw can only fix one connecting rod, and two adjacent pedicle screws along the length direction of the spine are connected through only one connecting rod, so that the fixing effect is poor, the postoperative recovery effect is poor, and even the operation failure is easily caused.

To this end, this embodiment provides a spinal fixation device, as shown in fig. 1, which includes a connection rod and a pedicle screw, wherein the pedicle screw is installed with the connection rod and screwed into the pedicle, and the connection rod supports the spine in the length direction. The pedicle screw comprises a screw rod 1, a screw head 2 and a connector 3, wherein as shown in fig. 2, an external thread 4 is arranged on the screw rod 1 and is used for being connected with the pedicle of vertebral arch, the external thread 4 is arranged on the screw rod 1, and the pitch of the external thread 4 far away from the screw head 2 is larger than that of the external thread 4 close to the screw head 2. When screw rod 1 is connected with the pedicle of vertebral arch, external screw thread 4 that pitch is big is connected with cancellous bone, and external screw thread 4 that pitch is little is connected with compact bone, can effectually prevent that the screw is not hard up, the slippage, strengthens the firmness. The pitch of the external thread 4 may also taper from the end of the screw shaft 1 remote from the screw head 2 to the end close to the screw head 2. Three knife edges are uniformly distributed at one end of the screw rod 1 far away from the screw head 2, and the cutting helix angle A of the knife edges is 5-30 degrees. Optionally, the knife edge is a self-cutting self-tapping screw, and the pedicle screw has a cutting function due to the arrangement of the knife edge, so that the screw rod 1 can extend into the pedicle.

The middle part of the screw head 2 is provided with a first rod placing part for installing a connecting rod, two opposite side walls are arranged on two sides of the first rod placing part, and at least one side wall is provided with a guide rail 9 arranged along the axial direction of the screw head 2; the connector 3 is matched and connected with the guide rail 9 on the screw head 2, a second rod placing part is arranged on the connector 3 and used for installing a connecting rod, and the connecting rod installed on the second rod placing part is basically parallel to the connecting rod installed on the first rod placing part.

The spinal fixation device that this embodiment provided connects connector 3 through the one side at the screwhead 2 of pedicle of vertebral arch screw, is equipped with the second on the connector 3 and puts excellent portion, and the second is put excellent portion and can be connected 1, 2 or a plurality of connective bars as required, and the connective bar combined action of being connected with first putting excellent portion can improve orthopedic power, makes orthopedic cycle shorten, and the operation resumes effectually.

In order to limit the upward movement of the connection head 3, the present embodiment further comprises a head cap 8, the head cap 8 being connected to an end of the screw head 2 remote from the screw shaft 1, in particular, the screw head 2 being threadedly connected to the head cap 8. One end of two side walls of the screw head 2, which is far away from the screw rod 1, is provided with a locking external thread 13, the screw head cap 8 comprises a top cover and a side ring, and a locking internal thread 10 matched with the locking external thread 13 is arranged in the side ring. The connection mode of the connector 3 and the screw head 2 is simple in the embodiment, the connector 3 cannot be separated from the screw head 2, the assembly is simple, and the connection is reliable. In other embodiments, the screw head 2 and the connector 3 can also be clamped, a clamping groove is arranged on the outer side surface of one of the screw head 2 and the connector 3, a clamping block is arranged on the other one of the screw head 2 and the connector, and the clamping groove and the clamping block are clamped.

In the present embodiment, the guide rail 9 is a sliding groove formed in the axial direction of the screw head 2 on the end surface of the screw head 2 at the end away from the screw shaft 1. In this embodiment, only be provided with two spouts on the lateral wall of one side, two spouts are symmetrical to be set up on this lateral wall. The connector 3 is provided with two ribs 12, and the two ribs 12 are respectively connected with the two sliding grooves on the side wall.

As shown in fig. 3, the first rod placing part includes a first rod placing hole and a first fixing hole 11, the first rod placing hole is used for placing the connecting rod, an axis of the first fixing hole 11 is perpendicular to the upper end face of the screw head 2, the axis of the first rod placing hole is perpendicular to the axis of the first fixing hole 11, a locking screw is connected in the first fixing hole 11 through an internal thread, and the locking screw is connected with the first fixing hole 11 through a thread and then compresses the connecting rod, so that the connecting rod is fixed in the first rod placing hole. Optionally, the first rod placing hole is a U-shaped groove 5, the width of the U-shaped groove 5 is matched with the outer diameter of the connecting rod, and the aperture of the first fixing hole 11 is larger than the width of the U-shaped groove 5.

As shown in fig. 4, the second rod placing part includes a second rod placing hole 6 and a second fixing hole 7, the second rod placing hole 6 is used for placing the connecting rod, the second fixing hole 7 is located on one side of the second rod placing hole 6, the axis of the second fixing hole 7 is perpendicular to the axis of the second rod placing hole 6, a locking screw capable of locking the connecting rod is connected in the second fixing hole 7 in a threaded manner, and the locking screw is fastened in the second fixing hole 7 and compresses and fixes the connecting rod.

In the present embodiment, the number of the second rod placing holes 6 is two, and the number of the second fixing holes 7 corresponding to the second rod placing holes 6 is two. The aperture of each second rod placing hole 6 is different from the apertures of the other second rod placing holes 6, and therefore, the connecting rod connecting device can be applied to connecting rods with different diameters. The diameter of the second rod placing hole 6 is adjustable within the range of 2mm-10mm, preferably 3mm-7mm, so as to adapt to the requirements of different patients.

In other embodiments, the number of the second rod placing holes 6 may be 1, 3 or more, and when there are a plurality of second rod placing holes 6, the sizes of the second rod placing holes 6 may be different or the same.

In the operation, when the pedicle screw is screwed into the pedicle of vertebral arch, the connector 3 of the pedicle screw after being screwed is required to be ensured to be positioned at one side far away from the vertebral body, so that the connector 3 and a connecting rod connected with the connector are prevented from interfering with the vertebral column.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A spinal fixation device comprising a connector rod and a pedicle screw, wherein the pedicle screw comprises:

the screw rod (1), the screw rod (1) is provided with external threads (4) for connecting with the pedicle of vertebral arch;

the screw head (2) is connected with the screw rod (1), a first rod placing part for installing a connecting rod is arranged in the middle of the screw head (2), two opposite side walls are arranged on two sides of the first rod placing part, and a guide rail (9) arranged along the axial direction of the screw head (2) is arranged on at least one side wall;

the connector (3) is matched and connected with the guide rail (9) on the screw head (2), a second rod placing part is arranged on the connector (3) and used for installing a connecting rod, and the connecting rod installed on the second rod placing part is basically parallel to the connecting rod installed on the first rod placing part;

the screw head cap (8) is connected with one end, far away from the screw head (2), of the screw rod (1) and can limit the connector (3) to be separated from the screw head (2).

2. The spinal fixation device of claim 1 wherein: the guide rail (9) is a sliding groove which is formed in the end face of one end, far away from the screw rod (1), of the screw head (2) along the axial direction of the screw head (2).

3. The spinal fixation device of claim 2 wherein: two symmetrical sliding grooves are formed in one side wall of the screw head (2), two convex edges (12) are arranged on the connector (3), and the convex edges (12) are respectively connected with the two sliding grooves in the side wall.

4. The spinal fixation device of claim 1 wherein: the screw head (2) is in threaded connection with the screw head cap (8).

5. The spinal fixation device of claim 4 wherein: two lateral walls of screwhead (2) are kept away from the one end of screw rod (1) is provided with locking external screw thread (13), nail head cap (8) include top cap and side ring, be provided with in the side ring with locking internal thread (10) of locking external screw thread (13) complex.

6. The spinal fixation device of claim 1 wherein: first putting excellent portion including being used for placing the connective bar first put excellent hole and be used for placing locking screw first fixed orifices (11), first fixed orifices (11) with first putting excellent hole intercommunication and set up in first top of putting excellent hole, first axis perpendicular to of putting excellent hole the axis of first fixed orifices (11), first fixed orifices (11) threaded connection has locking screw, locking screw can with the connective bar is fixed in first putting excellent downthehole.

7. The spinal fixation device of claim 1 wherein: the second rod placing part comprises a second rod placing hole (6) and a second fixing hole (7), the second fixing hole (7) is located on one side of the second rod placing hole (6), the axis of the second fixing hole (7) is perpendicular to the axis of the second rod placing hole (6), and the second fixing hole (7) is connected with a locking screw capable of locking the connecting rod in an internal thread mode.

8. The spinal fixation device of claim 7 wherein: the number of the second rod placing holes (6) and the number of the second fixing holes (7) are at least two, and the second rod placing holes (6) and the second fixing holes (7) are arranged in a one-to-one correspondence manner.

9. The spinal fixation device of claim 8 wherein: the second rod placing holes (6) are round holes, and the aperture of each second rod placing hole (6) is different from the apertures of the other second rod placing holes (6).

10. The spinal fixation device of claim 1 wherein: the screw is characterized in that an external thread (4) is arranged on the screw rod (1), the screw head (2) is far away, and the pitch of the external thread (4) is larger than that of the external thread (4) close to the screw head (2).