CN216124537U

CN216124537U - Domino connecting device

Info

Publication number: CN216124537U
Application number: CN202121392152.2U
Authority: CN
Inventors: 仉建国; 许小波; 宁静
Original assignee: Zhejiang Decans Medical Instrument Co ltd
Current assignee: Zhejiang Decans Medical Instrument Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2022-03-25
Anticipated expiration: 2031-06-22

Abstract

The patent discloses a domino connecting device includes: the titanium rod comprises a first titanium rod and a second titanium rod; a pedicle screw that fixes the titanium rod to a vertebra; the domino connector comprises a first arm and a second arm which are positioned in the same plane, an included angle between the first arm and the second arm is larger than 90 degrees and smaller than 180 degrees, and the first arm is provided with a through hole which is through from front to back; the second arm is provided with a groove which is through from front to back, and the top opening of the groove is arranged at the top of the second arm; the first titanium rod is fixedly accommodated in the through hole, and the second titanium rod is fixedly accommodated in the groove. The limitation of the domino system to connect the titanium rod is reduced by the scheme, and the size of the smaller domino connector is provided.

Description

Domino connecting device

Technical Field

This patent belongs to medical instrument technical field, concretely relates to domino connecting device.

Background

Scoliosis is a three-dimensional deformity that includes sequence abnormalities in the sagittal, coronal, and axial directions. The severe scoliosis can affect the growth and development of infants and teenagers, deform the body, and severely affect the heart and lung functions, even involve the spinal cord, and cause paralysis. Among the methods for treating scoliosis, surgical treatment is one of the important means for correcting severe scoliosis. The original physiological curvature of the spine is recovered through the posterior internal fixation of the spine, thereby treating the scoliosis. In posterior spinal fixation, surgery is sometimes required to extend the original fixed connecting rod to increase the fixation range, or to bridge the adjacent upper and lower segments of the titanium rod. This requires the use of domino connectors to increase the length of the connector rod.

The existing domino connector in the internal fixation of the spine is in a shape of a parallel hollow square block or a hollow long tube, as shown in the following fig. 1 and fig. 2. In the clinical application process, the following defects exist: the traditional domino has overlarge incisional marks and heavier body state, stimulates and enlarges local sclerotin and soft tissues, and postoperative patients may feel foreign body sensation. When the connecting rod is inserted into the existing domino connector, the tail end of the connecting rod needs to have enough length to ensure the strength after fixation; the tail end of the connecting rod is kept short in practical situations; to ensure the length requirement of the connecting rod, the most distal pedicle screw needs to be removed to provide a connecting rod of sufficient length to connect the domino connector, which not only increases the difficulty and time of the operation, but also increases the risk of spinal cord injury. In addition, when the prior domino connector is connected, operations such as rod penetration locking and the like are required. In the practical application process of clinical complicated orthopedic surgery, due to the influence of factors such as angles and positions, the titanium rod needs to be repeatedly shaped and bent, so that the operation of arranging the traditional domino connector is complicated and difficult, and the surgery time is prolonged.

Disclosure of Invention

This patent is based on the above-mentioned needs of the prior art and the technical problem to be solved by this patent is to provide a domino connecting device to provide a variety of flexibility and ease of installation in the use of the actual operation.

In order to solve the technical problem, the technical scheme provided by the patent comprises:

a domino connection apparatus, comprising:

the titanium rod comprises a first titanium rod and a second titanium rod;

a pedicle screw that fixes the titanium rod to a vertebra;

the domino connector comprises a first arm and a second arm which are positioned in the same plane, an included angle between the first arm and the second arm is larger than 90 degrees and smaller than 180 degrees, and the first arm is provided with a through hole which is through from front to back; the second arm is provided with a groove which is through from front to back, and the top opening of the groove is arranged at the top of the second arm; the first titanium rod is fixedly accommodated in the through hole, and the second titanium rod is fixedly accommodated in the groove.

Preferably, the pedicle screw comprises a screw body and a screw cap, and the titanium rod is fixedly arranged in the screw cap.

Preferably, the titanium rod is a titanium alloy material.

Preferably, a longitudinal hole is formed in the top of the through hole, a first screw plug is accommodated in the longitudinal hole, the first screw plug is matched with threads in the longitudinal hole, and the first titanium rod is screwed into the through hole and locked in the through hole from top to bottom.

Preferably, the top of the groove is provided with a second screw plug, and the second screw plug is matched with the threads on the inner wall of the groove and is screwed into the groove from top to bottom, so that the second titanium rod is locked in the groove.

Through the scheme, the through hole and the groove are designed together, so that the first titanium rod and the through hole are convenient to connect, and then the second titanium rod can be conveniently connected with the groove. And because the hole grooves of the first arm and the second arm are matched, the domino connector occupies a small space when the functions are realized, the second groove can be connected with the middle part of the titanium rod, and the requirement on the length of the titanium rod is reduced.

Drawings

Fig. 1 is a schematic diagram of a prior art domino connector;

fig. 2 is a schematic diagram of another prior art domino connector;

FIG. 3 is a schematic diagram of a domino connector according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a domino connector according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a domino connector according to an embodiment of the present invention;

FIG. 6 is a schematic view of a domino connecting device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a domino connecting device according to an embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present patent refers to the accompanying drawings and is only for the purpose of illustrating preferred embodiments of the patent and is not to be construed as limiting the scope of the patent.

In this embodiment, a domino connection device is provided. The structure of the domino connecting device is shown in figures 6 and 7. The domino connecting device comprises a titanium rod 1, a pedicle screw 2 and a domino connector 3.

The titanium rod is a fixed rod made of titanium alloy, and the length and the size of the fixed rod are set according to different operation requirements. Mainly plays a role in fixing and correcting the shape. In the domino apparatus of the present embodiment, the number of the titanium rods is plural, that is, at least the first titanium rod 4 and the second titanium rod 5 are included.

And two ends of the first titanium rod are connected with the pedicle screws 2 and are fixed on the spine through the pedicle screws. The pedicle screw comprises a screw body 6 and a screw cap 7, wherein a U-shaped groove is formed in the upper end of the screw cap, and the titanium rod is arranged in the U-shaped groove and fixed with the screw cap through a plunger 8. In this embodiment, the pedicle screw may also adopt any other structure in the prior art, only by fixedly connecting both ends of the titanium rod to the spine.

In the present embodiment, a domino connector is disposed between two adjacent titanium rods, and the structure of the domino connector is shown in fig. 3, 4 and 5. In this embodiment, the domino connector comprises a base 9, which is composed of a first arm 10 and a second arm 11, the ends of which are connected at a predetermined angle α, preferably the first arm and the second arm are located in the same plane. The first arm is provided with a through hole 12 which penetrates through the first arm from front to back, the front and the back are directions perpendicular to the same plane where the first arm and the second arm are located, the through hole is used for accommodating a first titanium rod, and when the first titanium rod penetrates through the through hole 12, the titanium rod extends along the same plane where the first arm and the second arm are located. The second arm is provided with a groove 13, the groove comprises openings on two sides and a top opening, the openings on the two sides are arranged at the front end and the rear end of the second arm, and the depth direction of the groove extends along the direction of the second arm and forms the top opening at the top opening of the second arm.

Therefore, the second titanium rods can penetrate through the front end and the rear end of the groove and are arranged in the groove 13, and meanwhile, as the groove 13 and the through hole 12 actually have a certain angle, two titanium rods with the angle deviation can be arranged to be connected into a domino device so as to adapt to fixing requirements of different angles.

Further preferably, a longitudinal hole is formed in the top of the through hole, a first screw plug 14 is accommodated in the longitudinal hole, the first screw plug is matched with threads in the longitudinal hole, and the first titanium rod is locked in the through hole 12 by screwing into the through hole 12 from top to bottom.

Furthermore, the top of the groove 13 is also provided with a second plug screw 15 which is screwed into the groove from top to bottom in cooperation with the screw thread of the inner wall of the groove, thereby locking the second titanium rod in the groove.

Domino uses a single-sided open rod-receiving slot design, as shown in fig. 4. One end of the domino connector is in a U-shaped slotted design with an angle of 0-90 degrees, and the purpose is to facilitate doctors to perform clinical operations

The rod is conveniently placed and locked; the other end of the domino is designed as a closed round hole, so that the stability of the whole internal fixing device after the titanium rod is placed in the internal fixing device is guaranteed. The circle center of the bottom of the grooved U-shaped groove and the circle center of the closed through hole are positioned on the same horizontal line, so that the two bridged titanium rods can be positioned in parallel and parallel after the rods are arranged. A negative angle thread structure is provided along the direction of the extended U-shaped groove, as shown in fig. 5. The device is locked by using a negative angle plug screw so as to ensure the rod placing strength at the U-shaped groove, and a common plug screw is adopted at the closed end to lock the titanium rod. In the clinical application process, when a doctor needs to expand the original internal fixing device, the domino connector can be applied. The open U-shaped groove end can be used for being connected with a titanium rod of an original fixed nail rod device, and due to the open design and the opening facing the side face, the open U-shaped groove end is easy to connect and can be connected with any position of the original nail rod device, thereby reducing the surgical complications, avoiding the disassembly of the original nail rod device and greatly shortening the surgical time. The through hole at the closed hole end is connected with the expanded titanium rod, so that the internal fixation range can be enlarged.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A domino connection apparatus, comprising:

the titanium rod comprises a first titanium rod and a second titanium rod;

a pedicle screw that fixes the titanium rod to a vertebra;

the domino connector comprises a first arm and a second arm which are positioned in the same plane, an included angle between the first arm and the second arm is larger than 90 degrees and smaller than 180 degrees, and the first arm is provided with a through hole which is through from front to back; the second arm is provided with a groove which is through from front to back, and the top opening of the groove is arranged at the top of the second arm; the first titanium rod is fixedly accommodated in the through hole, and the second titanium rod is fixedly accommodated in the groove;

the sagittal eccentric double-U-shaped groove domino connector comprises a domino body and a U-shaped groove screw plug; the domino connector comprises two parallel grooves, and the two grooves are staggered at a preset position on a sagittal plane, namely the sagittal plane is eccentrically arranged;

the domino connector with the eccentric crown surface and double U-shaped grooves comprises a domino body and a U-shaped groove screw plug; a domino connector comprises two parallel slots, which are offset in the coronal plane by a predetermined distance, i.e. off-center in the sagittal plane.

2. The domino connection device of claim 1, wherein said pedicle screw comprises a screw body and a screw cap, said titanium rod being fixedly arranged in said screw cap.

3. The domino connection device of claim 1, wherein said titanium rod is a titanium alloy material.

4. The domino connecting device according to claim 1, wherein a longitudinal hole is formed at the top of the through hole, a first screw plug is accommodated in the longitudinal hole, the first screw plug is matched with threads in the longitudinal hole, and the first titanium rod is screwed into the through hole and locked in the through hole from top to bottom.

5. The domino connection device according to claim 1, wherein the top of said groove is provided with a second screw plug, said second screw plug is screwed into said groove from top to bottom in threaded engagement with the inner wall of said groove, thereby locking a second titanium rod in said groove.

6. The domino connection device of claim 5, wherein a middle portion of said second titanium rod is disposed in said slot.