CN219000505U

CN219000505U - Double-head pedicle screw with fusion and non-fusion functions

Info

Publication number: CN219000505U
Application number: CN202223067506.3U
Authority: CN
Inventors: 邵进; 霍凯伦; 杨铁毅
Original assignee: Shanghai Pudong New Area Gongli Hospital (the Second Military Medical University Affiliated Gongli Hospital)
Current assignee: Shanghai Pudong New Area Gongli Hospital (the Second Military Medical University Affiliated Gongli Hospital)
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-05-12
Anticipated expiration: 2032-11-18

Abstract

The double-head pedicle screw with the fusion and non-fusion functions comprises a movable screw head cap and a screw body, wherein a spherical screw head is arranged at the upper end of the screw body, a fixed screw head cap is arranged above the outer side surface of the screw body, a communication hole is formed in the middle of the side surface of the fixed screw head cap, and an included angle between the axis of the fixed screw head cap and the axis of the screw body is 10-20 degrees; the movable screw head cap is provided with a U-shaped groove, the bottom surface in the U-shaped groove is provided with a through hole for accommodating the spherical screw head, the upper end of the screw body is movably connected in the through hole through the spherical screw head, the inner cavity of the through hole is provided with a locking pressing cap, and the locking pressing cap is contacted with the upper surface of the spherical screw head. The utility model overcomes the defects of the prior art, can realize compatible coexistence of two internal fixation modes in a patient, thereby playing the role of connecting a non-fusion internal fixation system and a fusion internal fixation system and being more beneficial to the internal fixation operation of the patient in the spine operation.

Description

Double-head pedicle screw with fusion and non-fusion functions

Technical Field

The utility model relates to a human living article, relates to a medical instrument, in particular to a pedicle screw, and specifically relates to a double-head pedicle screw with fusion and non-fusion functions.

Background

Degeneration of structures around the lumbar spine, such as intervertebral discs, intervertebral joints, ligaments, nerves, musculature, etc., is closely associated with chronic lower back pain or instability of the spine. At present, the spinal fusion internal fixation operation of a nail-rod system is generally adopted for treating degenerative diseases such as lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis and the like and unstable spinal column.

With the advent of the aging society, many elderly patients with lumbar degeneration and spine instability often have muscular deficiency, muscle weakness is caused by lumbar muscle atrophy and fat infiltration, normal physiological functions of lumbar vertebrae cannot be maintained, once spinal fusion internal fixation technology of a lumbar fusion nail rod system is selected, the spinal segments subjected to degeneration are fused and fixed, movement limitation and mechanical property change of adjacent segments are caused, stress of adjacent segments is increased to accelerate degeneration of the adjacent segments, and new spine instability and stenosis occur; in addition, there is a risk of complications such as breakage of the rod system, formation of a prosthetic joint, etc.

Therefore, maintaining lumbar mobility while maintaining spinal pelvic balance is a new direction of clinical spinal surgical research. The scholars invented a dynamic non-fusion internal fixation system (Dynamic neutralization system, dynesys) for the spine and applied it in clinical practice, which consists of pedicle screws and elastic ropes connected therebetween that can control the anterior flexion and posterior extension. When the elastic rope is bent forwards, the elastic rope plays a role of a tension belt; when the elastic rope stretches backwards, the elastic rope plays a supporting role to limit the backward stretching. The Dynesys dynamic fixation system can effectively improve the stress conduction between lumbar vertebrae segments by a non-fusion method, relieve pain, prevent degeneration of adjacent segments, delay degeneration of intervertebral discs, and even repair the degenerated intervertebral discs. The Dynesys dynamic fixing system solves the problems of postoperative spinal stiffness, obvious increase of pressure of adjacent sections and the like caused by previous fusion internal fixation, can retain lumbar vertebra mobility, increase postoperative comfort and satisfaction of patients, has obvious short-term and long-term effects, and has been widely applied to clinical treatment of lumbar degeneration diseases.

However, in the current clinical practice, partial patients need two internal fixation modes of spinal fusion and Dynesys dynamic non-fusion of a nail-rod system simultaneously; the prior art cannot be compatible with the two internal fixing modes.

Disclosure of Invention

Aiming at the defects of the prior art in the current clinical practice work, the utility model provides the double-head pedicle screw with the fusion and non-fusion functions, overcomes the defects of the prior art, can realize compatibility and coexistence of two internal fixation modes in a patient, plays a role in connecting a non-fusion internal fixation system and a fusion internal fixation system, and is more beneficial to the internal fixation operation of the patient in the spinal surgery.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the double-head pedicle screw with the fusion and non-fusion functions comprises a movable screw head cap and a screw body, wherein a spherical screw head is arranged at the upper end of the screw body, a fixed screw head cap is arranged above the outer side surface of the screw body, a communication hole is formed in the middle of the side surface of the fixed screw head cap, and an included angle between the axis of the fixed screw head cap and the axis of the screw body is 10-20 degrees;

the movable screw head cap is provided with a U-shaped groove, the bottom surface in the U-shaped groove is provided with a through hole for accommodating the spherical screw head, the inner cavity of the through hole is provided with a locking pressing cap, the locking pressing cap is contacted with the upper surface of the spherical screw head, and the upper surface of the locking pressing cap is communicated with the inner cavity of the U-shaped groove.

Preferably, the included angle between the axis of the fixed screw head cap and the axis of the screw body is 15 degrees.

Preferably, the upper surface of the fixed screw head cap is provided with a sinking groove, and the sinking groove is communicated with the communication hole.

Preferably, the inner walls of the two sides of the U-shaped groove are concave cambered surfaces, and the inner walls of the U-shaped groove are provided with internal threads.

The utility model provides a double-head pedicle screw with fusion and non-fusion functions. The beneficial effects are as follows: the outer side surface of the nail body is provided with a fixed screw head cap, and the middle of the fixed screw head cap is provided with a communication hole, so that all the nail bodies are connected through an elastic rope, and dynamic non-fusion internal fixation of Dynesys is realized; the spherical nail head at the upper end of the nail body is movably connected with a through hole at the bottom surface in the U-shaped groove, the connecting rod is placed in the U-shaped groove, and then the screw plug is screwed into the U-shaped groove so as to lock and fix the nail body and the movable screw head cap, so that the fusion fixation of the connecting nail rod system is realized; therefore, the two internal fixation modes can be compatible and coexist in the patient body, thereby playing the role of connecting the non-fusion internal fixation system and the fusion internal fixation system and being more beneficial to the internal fixation operation of the spinal surgery patient.

Drawings

In order to more clearly illustrate the utility model or the technical solutions in the prior art, the drawings used in the description of the prior art will be briefly described below.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic plan view of the present utility model;

FIG. 3 is a schematic cross-sectional view of the present utility model;

the reference numerals in the figures illustrate:

1. a movable screw head cap; 2. a nail body; 3. spherical nail heads; 4. fixing a screw head cap; 5. a communication hole; 6. a U-shaped groove; 7. a through hole; 8. an internal thread; 9. sinking grooves; 10. the locking cap is pressed.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

1-3, a double-head pedicle screw with fusion and non-fusion functions comprises a movable screw head cap 1 and a screw body 2, wherein a spherical screw head 3 is arranged at the upper end of the screw body 2, a fixed screw head cap 4 is arranged above the outer side surface of the screw body 2, a communication hole 5 is arranged in the middle of the side surface of the fixed screw head cap 4, and an included angle between the axis of the fixed screw head cap 4 and the axis of the screw body 2 is 10-20 degrees;

the movable screw head cap 1 is provided with a U-shaped groove 6, the inner bottom surface of the U-shaped groove 6 is provided with a through hole 7 for accommodating the spherical screw head 3, the inner cavity of the through hole 7 is provided with a locking pressing cap 10, the locking pressing cap 10 is contacted with the upper surface of the spherical screw head 3, and the upper surface of the locking pressing cap 10 is communicated with the inner cavity of the U-shaped groove 6; when the screw plug is screwed into the U-shaped groove 6, the pressure of the screw plug is transmitted to the locking cap 10 via the connecting rod, so that the ball stud 3 can be held in compression by the locking cap 10.

Working principle:

because in the spine fusion internal fixation operation, the pedicle screw makes an angle of 5-10 degrees with the sagittal plane, while in the Dynesys dynamic non-fusion internal fixation operation, the pedicle screw makes an inclination of 20-25 degrees with the sagittal plane; therefore, when in use, the fixing screw head cap 4 is arranged above the outer side surface of the screw body 2, and the communication hole 5 is arranged in the middle of the fixing screw head cap 4, so that the screw bodies 2 are connected through the elastic rope, and dynamic non-fusion internal fixation of Dynesys is realized; the spherical nail head 3 at the upper end of the nail body 2 is movably connected with the through hole 7 at the inner bottom surface of the U-shaped groove 6, the connecting rod is placed into the U-shaped groove 6, and then the screw plug is screwed into the U-shaped groove 6, so that the spherical nail head 3 can be pressed and fixed through the locking pressing cap 10, and the nail body 2 and the movable screw head cap 1 are further locked and fixed, so that the fusion fixation of a connecting nail rod system is realized; therefore, the two internal fixation modes are compatible and coexist in the patient body, thereby playing the role of connecting the non-fusion internal fixation system and the fusion internal fixation system and being more beneficial to the internal fixation operation of the spinal surgery patient.

In the second embodiment, as a further preferable mode of the first embodiment, an angle between the axis of the fixed screw head cap 4 and the axis of the screw body 2 is set to 15 degrees. Because in the spine fusion internal fixation operation, the pedicle screw makes an angle of 5-10 degrees with the sagittal plane, while in the Dynesys dynamic non-fusion internal fixation operation, the pedicle screw makes an inclination of 20-25 degrees with the sagittal plane; thus, it can be seen that the feed angles of the two screws differ by most preferably 15 degrees.

In the third embodiment, as a further preferable mode of the first embodiment, a sinking groove 9 is formed on the upper surface of the fixed screw head cap 4, and the sinking groove 9 is communicated with the communicating hole 5. The sinking groove 9 is used for locking and limiting the elastic rope in the communication hole 5 through the riveting nail.

In the fourth embodiment, as a further preferable scheme of the first embodiment, inner walls at two sides of the U-shaped groove 6 are concave cambered surfaces, and inner threads 8 are arranged on the inner walls. The internal thread 8 is matched with the thread of the screw plug so as to facilitate the fixation of the connecting rod.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a double-end pedicle of vertebral arch screw that has fusion and non-fusion function concurrently, includes movable screw pin cap (1) and nail body (2), its characterized in that: the novel nail comprises a nail body (2), and is characterized in that a spherical nail head (3) is arranged at the upper end of the nail body (2), a fixed screw head cap (4) is arranged above the outer side surface of the nail body (2), a communication hole (5) is formed in the middle of the side surface of the fixed screw head cap (4), and an included angle between the axis of the fixed screw head cap (4) and the axis of the nail body (2) is 10-20 degrees;

the movable screw head cap (1) is provided with a U-shaped groove (6), the inner bottom surface of the U-shaped groove (6) is provided with a through hole (7) for accommodating the spherical screw head (3), the inner cavity of the through hole (7) is provided with a locking pressing cap (10), the locking pressing cap (10) is contacted with the upper surface of the spherical screw head (3), and the upper surface of the locking pressing cap (10) is communicated with the inner cavity of the U-shaped groove (6).

2. The double-ended pedicle screw having both fusion and non-fusion functions as claimed in claim 1, wherein: the included angle between the axis of the fixed screw head cap (4) and the axis of the screw body (2) is 15 degrees.

3. The double-ended pedicle screw having both fusion and non-fusion functions as claimed in claim 1, wherein: the upper surface of the fixed screw head cap (4) is provided with a sinking groove (9), and the sinking groove (9) is communicated with the communication hole (5).

4. The double-ended pedicle screw having both fusion and non-fusion functions as claimed in claim 1, wherein: the inner walls of the two sides of the U-shaped groove (6) are concave cambered surfaces, and the inner walls of the U-shaped groove are provided with internal threads (8).