CN215306584U

CN215306584U - Double-internal-locking universal spine minimally invasive fixator

Info

Publication number: CN215306584U
Application number: CN202121242174.0U
Authority: CN
Inventors: 王力永
Original assignee: Changzhou Kangding Medical Instrument Co ltd
Current assignee: Changzhou Kangding Medical Instrument Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-12-28
Anticipated expiration: 2031-06-04

Abstract

The utility model relates to the technical field of medical instruments, in particular to a double-internal-locking universal spine minimally invasive fixator which comprises a nail seat, a nail body, a pressing cap, an external jackscrew and an internal jackscrew, wherein the nail seat is provided with a mounting groove matched with a titanium rod, the lower end of the mounting groove is provided with an arc bottom for fixing the titanium rod, the lower end of the pressing cap is abutted against a ball head, the excircle of the pressing cap is matched with the mounting hole and is provided with a U-shaped groove for avoiding the titanium rod, the external jackscrew is in threaded connection with a ball seat, the lower end of the external jackscrew is abutted against the upper end surface of the pressing cap, the internal jackscrew is in threaded connection with the external jackscrew, the lower end surface of the internal jackscrew is abutted against the side surface of the titanium rod, through the structural design of double-internal-locking screws, a spherical hinge connection structure of the nail body and the nail seat is reserved, the problem that the titanium rod is difficult to be implanted into a fixed nail angle is solved, the titanium rod is convenient to be arranged, the nail body can be locked through the external jackscrew, after the centrum is reset, the titanium rod is locked through the internal jackscrew, is suitable for the occasions with obvious spinal deformation, is convenient for vertebral body reduction and adjustment, and well meets the use requirements of spinal surgery.

Description

Double-internal-locking universal spine minimally invasive fixator

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a double-internal-locking universal spine minimally invasive fixator.

Background

The spine fixator is commonly used for correcting the position of the spine and generally comprises a nail seat 1, a nail body 2, a titanium rod 6, a transverse connecting rod and other parts. The nail body 2 needs to pass through the nail seat 1 and be fixed on the spine, and then the titanium rod 6 passes through a plurality of nail seats 1 to reset and fix the spine.

The nail body 2 with the ball head is used in the prior art, the titanium rod 6 and the nail body 2 are tightly supported by the set screw on the nail seat 1, the spine is conveniently and obviously deformed, the structure is in clinical use, the connection between the nail body 2 and the nail seat 1 and the connection between the titanium rod 6 and the nail seat 1 can only be simultaneously loosened or clamped, when the spine is compressed or expanded and reset, the rear edge of the spine vertebral body is expanded or compressed due to the mobility of the universal connection between the nail body 2 and the nail seat 1, the front edge cannot be synchronously expanded or compressed, and the position of the vertebral body is not correct. If the nail body 2 fixedly connected with the nail seat 1 is used, the installation angle of the nail body is limited, and the titanium bar is difficult to plant.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a double-internal-locking universal spinal minimally invasive fixator.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a universal backbone wicresoft fixer of two internal locks, includes nail seat, the nail body, presses cap, outer jackscrew and interior jackscrew, the one end of the nail body is the bulb, the nail seat is equipped with the mounting hole, the drill way of mounting hole be equipped with bulb assorted ball seat, set up on the nail seat with titanium stick assorted mounting groove, the lower extreme of mounting groove is equipped with at the bottom of the circular arc that is used for fixed titanium stick, press the cap to be located the nail seat, its lower extreme butt bulb, its excircle and mounting hole match, and set up the U type groove that is used for dodging the titanium stick, outer jackscrew and nail seat threaded connection, and the up end of cap is pressed to its lower extreme butt, interior jackscrew and outer jackscrew threaded connection, and the side of its lower terminal surface butt titanium stick.

The utility model discloses a titanium rod, including the nail seat, the nail seat is equipped with the head cap, the titanium rod is planted again, will outer jackscrew screw in the nail seat, when the cap is pressed to the bottom surface butt of outer jackscrew, press the cap and can move down, until compressing tightly the nail body, stop rotatory outer jackscrew this moment, universal nail body has become fixed angle's staple, the titanium rod of planting still can move, can prop open or compressed operation to the centrum between two sets of nail seats, when guaranteeing that adjacent centrum distance reaches the state of ideal, in the jackscrew outside jackscrew with interior jackscrew, until interior jackscrew butt titanium rod surface and screw, it is fixed to guarantee to plant the titanium rod, the nail of planting finishes this moment.

According to another embodiment of the utility model, the external jackscrew is connected with the nail seat through rectangular thread. The lead angle of the rectangular thread is smaller, the self-locking performance is better after the connection between the external jackscrew and the ball seat is screwed down, and the connection is more stable.

According to another embodiment of the utility model, the outer jackscrew further comprises a straight groove formed on the upper end surface of the outer jackscrew. The position of the external jackscrew can be conveniently adjusted by using a special wrench.

According to another embodiment of the utility model, the upper end surface of the inner jackscrew is provided with an inner hexagonal hole. The position of the internal jackscrew can be conveniently adjusted by using a special wrench.

According to another embodiment of the utility model, the lower end surface of the pressing cap is provided with a spherical chamfer matched with a ball head, and the upper end of the ball head is provided with a flat surface. The pressing cap is also in spherical contact with the ball head of the nail body, so that the nail body and the ball seat are more stable after being locked in angle. And the whole structure is more compact.

According to another embodiment of the utility model, the upper end of the mounting groove of the nail seat is open, and the upper end of the mounting groove is provided with the extending arm in a symmetrical manner. The length of the nail seat is lengthened, and external fixation and operation are facilitated.

The utility model has the advantages that through the structural design of the double internal locking screws, the connecting structure of the screw body and the screw seat ball hinge is reserved, the problem that the titanium rod is difficult to implant at the angle of the fixing screw is solved, the titanium rod is convenient to arrange, meanwhile, the fixing screw body can be locked through the external jackscrew, after the vertebral body is reset, the titanium rod is locked through the internal jackscrew, the device adapts to the occasions with obvious vertebral deformation, is convenient for the vertebral body to reset and adjust, has compact structure and firm and stable locking, and well meets the use requirements of the vertebral operation.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an enlarged view at X in FIG. 2;

fig. 4 is a schematic view of a press cap structure.

In the figure, a nail seat 1, a ball seat 101, a mounting hole 102, an extension arm 103, a mounting groove 104, a nail body 2, a ball head 201, a pressing cap 3, a spherical chamfer 301, an outer circle 302, a U-shaped groove 303, an outer jackscrew 4, a straight groove 401, an inner jackscrew 5 and a titanium rod 6.

Detailed Description

As shown in figures 1-4, which are schematic structural views of the utility model, the utility model relates to a double-internal-locking universal spine minimally invasive fixator, which comprises a nail seat 1, a nail body 2, a pressing cap 3, an external top thread 4 and an internal top thread 5, one end of the nail body 2 is a ball head 201, the nail seat 1 is provided with a mounting hole 102, the orifice of the mounting hole 102 is provided with a ball seat 101 matched with the ball head 201, the nail seat 1 is provided with an installation groove 104 matched with the titanium rod 6, the lower end of the installation groove 104 is provided with an arc bottom for fixing the titanium rod 6, the press cap 3 is positioned in the nail seat 1, the lower end of the screw is connected with the ball head 201, the excircle 302 of the screw is matched with the mounting hole 102 and is provided with a U-shaped groove 303 for avoiding the titanium rod 6, the external jackscrew 4 is in threaded connection with the nail seat 1, and the lower end of the inner jackscrew 5 is abutted against the upper end surface of the pressing cap 3, the inner jackscrew 5 is in threaded connection with the outer jackscrew 4, and the lower end surface of the inner jackscrew is abutted against the side surface of the titanium rod 6.

After the titanium rod 6 is inserted into the U-shaped groove 303, the end surface of the U-shaped groove still exceeds the surface of the titanium rod 6, and is preferably 5.5-6mm higher. The outer jackscrew 4 is provided with external screw thread and internal thread, respectively with the internal thread of nail seat 1 and the external screw thread cooperation of interior jackscrew 5.

Specifically, a plurality of nail bodies 2 penetrate through the nail seat 1 to be implanted into a vertebral body according to needs, then a pressing cap 3 is arranged in the nail seat 1, a titanium rod 6 is implanted, an outer jackscrew 4 is screwed into the nail seat 1, when the bottom surface of the outer jackscrew 4 is abutted against the pressing cap 3, the pressing cap 3 can move downwards until the nail bodies 2 are pressed, the outer jackscrew 4 stops rotating at the moment, the universal nail body 2 becomes a fixed nail with a fixed angle, the implanted titanium rod 6 can still move in the nail seat 1, the vertebral body can be opened or compressed between the two groups of nail seats 1, when the distance between the adjacent vertebral bodies reaches an ideal state, the inner jackscrew 5 is screwed into the outer jackscrew 4 until the inner jackscrew 5 is abutted against the surface of the titanium rod 6 and screwed, the implanted titanium rod 6 is guaranteed to be fixed, and the implantation is finished.

Preferably, the external jackscrew 4 is in threaded connection with the nail seat 1 through a rectangular thread.

Preferably, the upper end face of the outer jackscrew 4 is provided with a straight groove 401.

Preferably, the upper end face of the inner jackscrew 5 is provided with an inner hexagonal hole.

Preferably, the lower end surface of the pressing cap 3 is provided with a spherical chamfer 301 matched with the ball head 201, and the upper end of the ball head 201 is provided with a flat surface.

Preferably, the upper end of the mounting groove 104 of the nail seat 1 is open, and the upper end thereof is symmetrically provided with the elongated arms 103 in an upward extending manner.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A double-internal-locking universal spine minimally invasive fixator is characterized by comprising a nail seat (1), a nail body (2), a pressing cap (3), an external jackscrew (4) and an internal jackscrew (5), wherein one end of the nail body (2) is provided with a ball head (201), the nail seat (1) is provided with a mounting hole (102), a ball seat (101) matched with the ball head (201) is arranged at an orifice of the mounting hole (102), a mounting groove (104) matched with a titanium rod (6) is formed in the nail seat (1), the lower end of the mounting groove (104) is provided with a circular arc bottom used for fixing the titanium rod (6), the pressing cap (3) is positioned in the nail seat (1), the lower end of the pressing cap is abutted against the ball head (201), the outer circle (302) of the pressing cap is matched with the mounting hole (102) and is provided with a U-shaped groove (303) used for avoiding the titanium rod (6), and the external jackscrew (4) is in threaded connection with the nail seat (1), the lower end of the inner jackscrew is abutted against the upper end face of the pressing cap (3), the inner jackscrew (5) is in threaded connection with the outer jackscrew (4), and the lower end face of the inner jackscrew is abutted against the side face of the titanium rod (6).

2. The minimally invasive fixator of the universal spine with double internal locks according to claim 1 is characterized in that the external jackscrew (4) is in threaded connection with the nail seat (1) through rectangular threads.

3. The minimally invasive fixator of the universal spine with double inner locks according to claim 1, wherein a straight groove (401) is formed in the upper end face of the outer jackscrew (4).

4. The minimally invasive fixator of the universal spine with double inner locks according to claim 1, wherein an inner hexagonal hole is formed in the upper end face of the inner jackscrew (5).

5. The minimally invasive fixator of the universal spine with the double inner locks as claimed in claim 1, wherein the lower end face of the pressing cap (3) is provided with a spherical chamfer (301) matched with a ball head (201), and the upper end of the ball head (201) is provided with a flat face.

6. The minimally invasive fixator of the universal spine with double inner locks according to claim 1 is characterized in that the upper end of the installation groove (104) of the nail seat (1) is open, and the upper end of the installation groove is symmetrically provided with the elongated arms (103) in an upward extending manner.