CN217593025U

CN217593025U - Pedicle screw and pedicle screw fixing system

Info

Publication number: CN217593025U
Application number: CN202220274045.8U
Authority: CN
Inventors: 李危石
Original assignee: Peking University Third Hospital
Current assignee: Peking University Third Hospital
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-10-18
Anticipated expiration: 2032-02-10

Abstract

The application discloses a pedicle screw comprises a screw body and a screw sleeve assembly; the nail sleeve assembly is sleeved on the top of the nail body; the nail sleeve assembly and the nail body are coaxial, and the nail sleeve assembly axially rotates relative to the nail body; the nail body comprises a nail head and a nail rod which are integrally formed; the nail sleeve assembly comprises a nail sleeve and a position fixing piece, wherein the bottom of the nail sleeve is provided with a mounting hole, and the mounting hole is communicated with an inner cavity of the nail sleeve; the top of the tack sleeve comprises a rotational guide; the position fixing piece is arranged in the mounting hole and used for fixing the position of the nail head in the mounting hole. In this application, just can realize the regulation of U type groove direction in the inner chamber through the direction of adjusting the nail cover, avoid the nail body in the rotation after the rigidity, avoid disconnected nail risk, make wearing to establish and locking more convenient and fast of connective bar in minimal access surgery simultaneously.

Description

Pedicle screw and pedicle screw fixing system

Technical Field

The application relates to the technical field of medical instruments, in particular to a pedicle screw and a pedicle screw fixing system.

Background

Pedicle screw technology is commonly used in spinal Surgery, and in recent years, with the combination of percutaneous pedicle screw technology with Computer Assisted Surgery (CAS) and endoscopic technology, pedicle screw technology has been widely used in surgical diagnosis and treatment of lumbar spondylolisthesis, spinal fracture, chronic low back pain and spinal tumor, and is a basic means of minimally invasive spinal Surgery.

The existing pedicle screws are universal screws, single-plane screws or single-shaft screws, and the universal swing characteristic of the body of the universal screw and the plane swing characteristic of the single-plane screw are inconvenient to expand and pressurize and are not beneficial to bearing and conducting force; and the integral type structural feature of unipolar nail, need rotate the direction that adjusts U type groove simultaneously to the pin fin and the nail body of unipolar nail when the installation fixed rod, influence the unipolar nail that has fixed easily, and because its integral type structural feature, can not effectively disperse stress, there is the risk of disconnected nail.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a pedicle screw and pedicle screw fixing system, the regulation of U type groove direction in the inner chamber just can be realized through the direction of adjusting the nail cover, avoids the rotation of the nail body after the position is fixed, avoids the screw breakage risk, makes wearing to establish and the locking of connective bar more convenient and fast in minimal access surgery simultaneously.

In one aspect, the present application provides a pedicle screw, which includes a screw body and a screw sleeve assembly;

the nail sleeve component is sleeved at the top of the nail body; the nail sleeve component is coaxial with the nail body, and the nail sleeve component axially rotates relative to the nail body;

the nail body comprises a nail head and a nail rod which are integrally formed;

the nail sleeve assembly comprises a nail sleeve and a position fixing piece, the bottom of the nail sleeve is provided with a mounting hole, and the mounting hole is communicated with the inner cavity of the nail sleeve; the top of the staple cartridge includes a rotating guide;

the position fixing piece is arranged in the mounting hole and used for fixing the position of the nail head in the mounting hole.

Further, the position fixing piece comprises a cylindrical cavity, the cylindrical cavity is positioned at the bottom of the position fixing piece, and the top of the nail head is embedded into the cylindrical cavity; the cylindrical cavity and the stud are coaxial and the stud is axially rotated relative to the position fastener.

Further, the nail head comprises an arc-shaped surface, the arc-shaped surface is positioned on the side surface of the nail head, and the arc-shaped surface is in abutting connection with the inner wall of the mounting hole;

the bottom of the nail sleeve is bent towards the inner part of the mounting hole to form a limiting ring, the diameter of the inner wall of the limiting ring is smaller than the maximum diameter of the nail head, and the limiting ring is used for fixing the nail head in the mounting hole.

Further, the inner cavity is of a U-shaped groove structure, and the rotary guide piece is connected to two side walls of the inner cavity.

Furthermore, the outer side wall of the position fixing piece is relatively provided with a limiting hole, and the inner wall of the mounting hole is relatively provided with a limiting part matched with the limiting hole.

Further, the rotating guide is located on the first axis, and the mounting hole and the inner cavity are located on the second axis.

Further, the bottom of the rotating guide member is provided with a first breaking portion.

Further, the two side walls of the inner cavity and the inner side wall of the rotary guide part are provided with internal threads.

Further, the length of the staple cartridge assembly is 50-110 millimeters.

In another aspect, a pedicle screw fixation system is provided, which comprises the pedicle screw.

The pedicle screw and the pedicle screw fixing system provided by the embodiment of the application have the following technical effects:

in the application, the pedicle screw comprises a screw body and a screw sleeve assembly, the screw sleeve assembly is sleeved at the top of the screw body, the screw sleeve assembly and the screw body are coaxial, the screw sleeve assembly axially rotates relative to the screw body, the direction of a U-shaped groove in an inner cavity can be adjusted by adjusting the direction of the screw sleeve, the rotation of the screw body after the position is fixed is avoided, the stability of the pedicle screw is improved, and the risk of screw breakage is avoided; the non-moving characteristic of the nail sleeve component and the nail body in the axial direction is favorable for bearing and transmitting force, and the distraction and pressurization of the spine are facilitated; and the long arm structure of the rotary guide piece enables the connecting rod to be more conveniently and quickly inserted and locked in the minimally invasive surgery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an exploded view of a pedicle screw according to an embodiment of the invention;

FIG. 2 is an assembled view of a pedicle screw provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of a pedicle screw according to an embodiment of the disclosure;

fig. 4 is a partially enlarged schematic view at a in fig. 3.

In the figure, 1-nail body, 11-nail head, 111-arc surface, 12-nail rod, 2-nail sleeve component, 21-nail sleeve, 211-installation hole, 2111-limiting part, 212-inner cavity, 213-rotating guide part, 2131-first breaking part, 2132-second breaking part, 214-limiting ring, 215-internal thread, 22-position fixing part, 221-cylindrical cavity, 222-limiting hole, 3-locking nut and 4-connecting rod.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. In the description of the present invention, it is to be understood that the terms "upper", "top", "bottom", and the like refer to orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

An embodiment of a pedicle screw of the present application is described below, and specifically, as shown in fig. 1 to 4, the pedicle screw comprises a screw body 1 and a screw sleeve assembly 2.

The top of the nail body 1 is located to the cover of the nail cover subassembly 2 cover, and the cover of the nail subassembly 2 is coaxial with the nail body 1, and the cover of the nail subassembly 2 can carry out axial rotation for the nail body 1.

The nail body 1 comprises a nail head 11 and a nail rod 12 which are integrally formed.

The nail sleeve assembly 2 comprises a nail sleeve 21 and a position fixing piece 22, a mounting hole 211 is formed in the bottom of the nail sleeve 21, the mounting hole 211 is communicated with an inner cavity 212 of the nail sleeve 21, and a rotating guide 213 is arranged at the top of the nail sleeve 21.

A position fixing member 22 is provided in the mounting hole 211, the position fixing member 22 being for fixing the position of the stud 11 in the mounting hole 211.

Through the mounting hole 211 that position fixing piece 22 and nail cover 21 bottom were equipped with, can make the pin fin 11 when carrying out axial rotation for nail cover subassembly 2, keep relatively fixed with nail cover subassembly 2 in the vertical direction, improved pedicle screw's stability.

In the present embodiment, the position fixing member 22 includes a cylindrical cavity 221, the cylindrical cavity 221 is located at the bottom of the position fixing member 22, the top of the stud 11 is embedded in the cylindrical cavity 221, the cylindrical cavity 221 and the stud 11 are coaxial, and the stud 11 rotates axially relative to the position fixing member 22.

Thus, the cylindrical cavity 221 at the bottom of the position fixing member 22 and the stud 11 embedded in the cylindrical cavity 221 can form an interference connection, and the cylindrical cavity 221 can rotate relatively to the axial direction of the stud 11, so that the stud body 1 can be kept stationary when the rotating sleeve assembly 2 adjusts the direction of the inner cavity 212.

Further, the nail head 11 may include an arc-shaped surface 111, the arc-shaped surface 111 may be located on a side surface of the nail head 11, of course, the arc-shaped surface 111 may also be located on a bottom surface of the nail head 11, the arc-shaped surface 111 is connected with an inner wall of the mounting hole 211 in an abutting manner, and the bottom of the nail sleeve 21 is bent towards the inside of the mounting hole 211 to form a limiting ring 214, wherein a diameter of the inner wall of the limiting ring 214 is smaller than a maximum diameter of the nail head 11, and the limiting ring 214 is used for fixing the nail head 11 in the mounting hole 211.

So, the pin fin 11 is contradicted with the mounting hole 211 inner wall through arcwall face 111 and is connected to and spacing ring 214 is spacing in vertical direction, further promotes the stability of nail cover subassembly 2 and the nail body 1 when carrying out relative axial rotation.

In the embodiment of the present application, the inner cavity 212 is a U-shaped groove structure, the inner cavity 212 is used for installing the connecting rod 4, and the rotating guide 213 is connected to two side walls of the inner cavity 212, and the rotating guide is a long arm structure.

By connecting the rotary guide members 213 to both side walls of the inner cavity, the process of inserting the connecting rod 4 into the inner cavity 212 and the process of locking the connecting rod 4 by the locking nut 3 are more convenient and faster when minimally invasive spine surgery is performed.

In the embodiment of the present application, the outer side wall of the position fixing member 22 is relatively provided with the limiting hole 222, the inner wall of the mounting hole 211 is relatively provided with the limiting portion 2111 matched with the limiting hole 222, and the position fixing member 22 is limited in the mounting hole 211 through the matching of the limiting hole 222 and the limiting portion 2111.

In an alternative embodiment, the position-limiting portion 111 may be a punching structure disposed on the inner wall of the mounting hole 211, and after the position-fixing member 22 is located in the mounting hole 211 and connected with the stud 11 in an abutting manner, the position-limiting portion is limited by the punching structure in cooperation with the limiting hole 222.

Specifically, the limiting portion 111 may be a circular thin-walled structure disposed on the inner wall of the mounting hole 211, and after the position fixing member 22 is located in the mounting hole 211 and is in contact connection with the stud 11, the outer wall of the circular thin-walled structure is punched to protrude into the limiting hole 222, so as to limit the position fixing member 22.

In the embodiment of the present application, the rotation guide 213 is located on a first axis, and the mounting hole 211 and the inner cavity 212 are located on a second axis.

Specifically, the rotation guide 213 includes two long arms connected to two sidewalls of the inner cavity 212, respectively, and a connection rib connecting the two long arms, the connection rib being located on a first axis, the first axis and a second axis being parallel axes, in other words, the connection rib is not in a vertical direction of the mounting hole 211 and the inner cavity 212. This avoids the interference that the rotation guide 213 may cause when the lock nut 3 fixes the connection rod 4.

In the embodiment of the present application, the bottom of the rotation guide 213 is provided with a first cut-off portion 2131, and the tops of the two long arms in the rotation guide 213 are provided with second cut-off portions 2132, respectively. In this way, after the coupling rod 4 is fixed to the cavity 212 by the lock nut 3, the second and first breaking

portions

2132 and 2131 are sequentially broken, whereby the rotation guide 213 can be detached from the pin holder 21.

In the present embodiment, both sidewalls of the inner cavity 212 and the inner sidewall of the rotation guide 213 are provided with internal threads. Specifically, the inner sides of the two long arms of the rotation guide 213 are provided with female threads, which are the same as those of both side walls of the cavity 212. Thus, after the connecting rod 4 is disposed in the predetermined position of the inner cavity 212, the locking nut 3 can be screwed into the inner cavity along the inner side wall of the rotating guide member 213 and the two side walls of the inner cavity 212 in sequence, so as to fix the connecting rod 4.

Further, the length of the tack sleeve assembly may be 50-110 millimeters.

Preferably, the staple cartridge assembly may have a length of 50 millimeters.

Preferably, the staple cartridge assembly may be 55 millimeters in length.

Preferably, the length of the tack sleeve assembly may be 60 millimeters.

Preferably, the staple cartridge assembly may have a length of 65 millimeters.

Preferably, the staple cartridge assembly may have a length of 70 millimeters.

Preferably, the staple cartridge assembly may be 75 millimeters in length.

Preferably, the staple cartridge assembly may have a length of 80 millimeters.

Preferably, the staple cartridge assembly may have a length of 85 millimeters.

Preferably, the staple cartridge assembly may have a length of 90 millimeters.

Preferably, the staple cartridge assembly may be 95 millimeters in length.

Preferably, the staple cartridge assembly may have a length of 100 millimeters.

Preferably, the staple cartridge assembly may have a length of 105 millimeters.

Preferably, the staple cartridge assembly may have a length of 110 millimeters.

The embodiment of the application also provides a pedicle screw fixing system, which comprises the pedicle screw.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A pedicle screw is characterized by comprising a screw body and a screw sleeve assembly;

the nail sleeve component is sleeved at the top of the nail body; the nail sleeve assembly and the nail body are coaxial, and the nail sleeve assembly axially rotates relative to the nail body;

the nail body comprises a nail head and a nail rod which are integrally formed;

the nail sleeve assembly comprises a nail sleeve and a position fixing piece, wherein the bottom of the nail sleeve is provided with a mounting hole, and the mounting hole is communicated with an inner cavity of the nail sleeve; the top of the tack sleeve comprises a rotational guide;

2. The pedicle screw according to claim 1, wherein the position fixation member comprises a cylindrical cavity at the bottom thereof and the top of the head is embedded in the cylindrical cavity; the cylindrical cavity and the stud are coaxial, and the stud rotates axially relative to the position fastener.

3. The pedicle screw according to claim 2, wherein the head comprises an arc-shaped surface, the arc-shaped surface is positioned on the side surface of the head, and the arc-shaped surface is in interference connection with the inner wall of the mounting hole;

4. The pedicle screw according to claim 1, wherein the inner cavity is a U-shaped groove structure, and the rotation guide members are connected to two side walls of the inner cavity.

5. The pedicle screw according to claim 4, wherein the outer side wall of the position fixing member is provided with a limiting hole, and the inner wall of the mounting hole is provided with a limiting part matching with the limiting hole.

6. The pedicle screw according to claim 4, wherein the rotating guide is located on a first axis and the mounting hole and the lumen are located on a second axis.

7. The pedicle screw according to claim 4, wherein the bottom of the rotating guide is provided with a first break.

8. Pedicle screw according to claim 3 or 4, wherein the inner side walls of the inner cavity and the inner side walls of the rotation guide are provided with an inner thread.

9. The pedicle screw according to claim 1, wherein the screw sleeve assembly has a length of 50-110 mm.

10. A pedicle screw fixation system comprising a pedicle screw according to any one of claims 1-9.