Bottom-mounted cervical vertebra screw

Abstract

The utility model discloses a bottom-mounted cervical vertebra screw which comprises a screw rod, a fixing sleeve and an extrusion reinforcing seat, one end of the screw rod is provided with fastening threads and a positioning sharp knife, the other end of the screw rod is fixedly connected with a hexagonal groove, the hexagonal groove is formed in a rotary knob, an open groove is formed in the top of the fixing sleeve, and the extrusion reinforcing seat is arranged in the open groove. The extrusion reinforcing device has the advantages that the fixing sleeve is positioned through the hexagonal knob, the screw rod is prevented from driving the fixing sleeve to slip, and then the extrusion reinforcing seat is embedded into the fixing sleeve, so that the extrusion reinforcing seat is positioned and extruded on the knob through the hexagonal positioning block; and the hexagonal fastening bolt is connected between the extrusion reinforcing seat and the fixing sleeve in a penetrating manner, so that the fixing sleeve and the extrusion reinforcing seat are limited and fixed, the screw rod is extruded and fixed on the fixing sleeve, the structure is reasonable, positioning and down-mounting are facilitated, and meanwhile better firmness is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially relates to a lower mounted cervical vertebra screw. BACKGROUND

[0002] Spinal internal fixation technology has been used for treating spinal diseases for several decades. Generally, the true sense of spinal internal fixation began in the 1950s, and "Har's rod" became the first posterior internal fixation system and reported the clinical application effect in 1962. Subsequently, in the 1970s, with the generation of the "segmental spinal internal fixation" theory, it gradually evolved into the C-D (Cotrel-Dubousset) internal fixation system in the 1980s and was widely used in clinical practice.

[0003] The utility model discloses a lower mounted cervical vertebra screw discloses a lower mounted cervical vertebra screw. Including screw seat, be equipped with U type groove on the screw seat, the side of U type groove is equipped with the top silk thread, the top silk thread is connected with the top silk thread screw thread, the bottom of screw seat is equipped with fixed ring and pressure ring, fixed ring and screw seat fixed connection, the pressure ring and fixed ring form the ball socket, the ball socket is equipped with ball head screw, and the fixed ring is equipped with fastening bottom pier.

[0004] The device does not have better firmness when in use, and the ball head screw is easy to loosen after tightening, which has a certain influence, so a lower mounted cervical vertebra screw is needed to solve the above problems. UTILITY MODEL CONTENTS

[0005] To solve the above problems, the utility model provides a lower mounted cervical vertebra screw, and the utility model is realized through the following technical schemes.

[0006] A lower mounted cervical vertebra screw, including screw rod, fixed sleeve and extrusion reinforcing seat, one end of the screw rod is provided with fastening thread and positioning sharp knife, the other end of the screw rod is fixedly connected with hexagonal groove, a hexagonal groove is formed in the rotating knob, a slot is formed in the top of the fixed sleeve, a first perforation formed in the bottom of the fixed sleeve is concentric and communicated with the slot, a hexagonal knob is arranged on the top of the fixed sleeve, two openings are symmetrically arranged on the outer surface of the fixed sleeve, a bolt groove is formed in the outer surface of the fixed sleeve, a second perforation formed in the inside of the fixed sleeve is concentric and communicated with the bolt groove, a hexagonal positioning block is rotatably connected to the bottom of the extrusion reinforcing seat through a shaft, and a thread groove is formed in the outer surface of the extrusion reinforcing seat.

[0007] Further, the fastening thread is a variable-pitch structure.

[0008] Further, the positioning sharp knife is in an inverted triangular structure, and the two sides of the positioning sharp knife are sharpened.

[0009] Further, the screw rod is connected to the fixing sleeve through the first through hole.

[0010] Further, the hexagonal positioning block is embeddedly connected to the rotating knob through the hexagonal groove, the hexagonal fastening bolt is embeddedly connected to the fixing sleeve through the bolt groove, and one end of the hexagonal fastening bolt penetrating through the second through hole is screwedly connected to the screw groove.

[0011] The device has the advantages that in the working process, the fixing sleeve is sleeved on one end of the screw rod, the screw rod is screwed into the cervical vertebra, the tool is used to position the fixing sleeve through the hexagonal knob to avoid the screw rod from sliding with the fixing sleeve, the extrusion reinforcing base is embedded into the fixing sleeve, the extrusion reinforcing base is positioned and extruded on the rotating knob through the hexagonal positioning block, the hexagonal fastening bolt is connected between the extrusion reinforcing base and the fixing sleeve, the fixing sleeve and the extrusion reinforcing base are fixed and limited, the screw rod is extruded and fixed on the fixing sleeve, the structure is reasonable, the positioning is convenient, and the device has better firmness. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the specific implementation manner, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without paying creative labor.

[0013] Figure 1 The utility model discloses a lower-mounted cervical vertebra screw structure schematic view.

[0014] Figure 2 The utility model discloses a screw rod structure schematic view.

[0015] Figure 3 The utility model discloses an extrusion reinforcing base and hexagonal fastening bolt structure schematic view.

[0016] Figure 4 The utility model discloses a fixing sleeve structure schematic view.

[0017] Figure 5 The utility model discloses a lower-mounted cervical vertebra screw structure schematic view. Figure 4 The utility model discloses a lower-mounted cervical vertebra screw structure schematic view.

[0018] The following are the signs of the drawings:

[0019] 1, screw rod;11, fastening thread;12, positioning sharp knife;13, rotating knob;131, hexagonal groove;

[0020] 2, fixed sleeve; 21, slot; 22, first perforation; 23, opening; 24, hexagonal knob; 25, bolt slot; 26, second perforation;

[0021] 3, extrusion reinforcing seat; 31, hexagonal positioning block; 32, threaded groove;

[0022] 4, hexagonal fastening bolt. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] As shown in the utility model has the following specific embodiments. Figures 1-5

[0025] Embodiment:

[0026] A lower-mounted cervical screw, comprising a screw rod 1, a fixed sleeve 2 and an extrusion reinforcing seat 3, one end of the screw rod 1 is provided with a fastening thread 11 and a positioning sharp knife 12, the other end of the screw rod 1 is fixedly connected with a hexagonal groove 131, a hexagonal groove 131 is formed in a rotating knob 13, a slot 21 is formed in the top of the fixed sleeve 2, a first perforation 22 formed in the bottom of the fixed sleeve 2 is concentric and communicated with the slot 21, a hexagonal knob 24 is arranged on the top of the fixed sleeve 2, two openings 23 are symmetrically arranged on the outer surface of the fixed sleeve 2, a bolt slot 25 is formed in the outer surface of the fixed sleeve 2, a second perforation 26 formed in the inside of the fixed sleeve 2 is concentric and communicated with the bolt slot 25, a hexagonal positioning block 31 is rotatably connected to the bottom of the extrusion reinforcing seat 3 through a shaft, and a threaded groove 32 is formed in the outer surface of the extrusion reinforcing seat 3.

[0027] By adopting the above technical scheme, when the device is used, the fixed sleeve 2 is first sleeved on one end of the screw rod 1, and then the screw rod 1 is rotated and tightened into the cervical vertebra, in the process of tightening, the tool is used to position the fixed sleeve 2 through the hexagonal knob 24, so as to avoid that the screw rod 1 drives the fixed sleeve 2 to slip, then the extrusion reinforcing seat 3 is embedded into the fixed sleeve 2, so that the extrusion reinforcing seat 3 is positioned and extruded on the rotating knob 13 through the hexagonal positioning block 31, and then the hexagonal fastening bolt 4 is connected between the extrusion reinforcing seat 3 and the fixed sleeve 2, so that the fixed sleeve 2 and the extrusion reinforcing seat 3 are limited and fixed, and then the screw rod 1 is extruded and fixed on the fixed sleeve 2, which is reasonable in structure, convenient for positioning and lower-mounted, and has better firmness.

[0028] Specifically, the fastening thread 11 is a variable-pitch structure.​

[0029] By adopting the technical scheme, the fastening thread 11 on the screw rod 1 adopts the margin type structure, so that the screw rod 1 has better firmness when being screwed.

[0030] Specifically, the positioning sharp knife 12 is in an inverted triangular structure, and the two sides of the positioning sharp knife 12 are sharpened.

[0031] By adopting the technical scheme, the screw rod 1 can be vertically positioned on the cervical vertebra through the positioning sharp knife 12, so that the screw rod 1 is prevented from slipping during installation.

[0032] Specifically, the screw rod 1 is connected to the fixing sleeve 2 through the first through hole 22.

[0033] By adopting the technical scheme, the screw rod 1 and the fixing sleeve 2 can be connected through the first through hole 22.

[0034] Specifically, the hexagonal positioning block 31 is embedded and matched with the rotating knob 13 through the hexagonal groove 131, the hexagonal fastening bolt 4 is embedded and connected to the fixing sleeve 2 through the bolt groove 25, and one end of the hexagonal fastening bolt 4 penetrating the second through hole 26 is screw matched with the thread groove 32.

[0035] By adopting the technical scheme, the extrusion reinforcing seat 3 can be embedded into the slot 21, the hexagonal positioning block 31 rotating on the extrusion reinforcing seat 3 can be matched with the hexagonal groove 131 of the rotating knob 13, the thread groove 32 can be overlapped with the bolt groove 25 by rotating the extrusion reinforcing seat 3, at this time, the hexagonal fastening bolt 4 can be embedded into the bolt groove 25, and is screw matched with the thread groove 32 of the extrusion reinforcing seat 3 through the second through hole 26, so that the extrusion reinforcing seat 3 and the fixing sleeve 2 are transversely fixed, and then the rotating knob 13 in the fixing sleeve 2 is extruded and limited, so that the firmness between the screw rod 1 and the fixing sleeve 2 is increased.

[0036] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details, and the utility model is not limited to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments, in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and use the utility model. The utility model is limited by the claims and the whole scope and equivalents.

Claims

1. A lower-mounted cervical screw comprising a screw rod (1), a fixing sleeve (2) and an extruded reinforcing seat (3), characterized in that: One end of the screw rod (1) is provided with a fastening thread (11) and a positioning sharp knife (12), the other end of the screw rod (1) is fixedly connected with a hexagonal groove (131), a rotating knob (13) is provided with a hexagonal groove (131), the top of the fixed sleeve (2) is provided with a slot (21), the first perforation (22) in the bottom of the fixed sleeve (2) is concentric and communicated with the slot (21), the top of the fixed sleeve (2) is provided with a hexagonal knob (24), the outer surface of the fixed sleeve (2) is symmetrically provided with two openings (23), the outer surface of the fixed sleeve (2) is provided with a bolt groove (25), the second perforation (26) in the fixed sleeve (2) is concentric and communicated with the bolt groove (25), the bottom of the extrusion reinforcing seat (3) is rotatably connected with a hexagonal positioning block (31) through a shaft, and the outer surface of the extrusion reinforcing seat (3) is provided with a threaded groove (32).

2. A sub-occipital cervical screw according to claim 1, wherein: The fastening thread (11) is a variable pitch structure.

3. A subsurface cervical screw as defined in claim 1, wherein: The positioning sharp knife (12) is in an inverted triangular structure, and the two sides of the positioning sharp knife (12) are opened.

4. A sub-occipital screw according to claim 1, wherein: The screw rod (1) is connected on the fixed sleeve (2) through the first perforation (22).

5. A lower profile cervical screw as recited in claim 1, wherein: The hexagonal positioning block (31) is embeddedly matched with the rotating knob (13) through the hexagonal groove (131), further comprising a hexagonal fastening bolt (4), the hexagonal fastening bolt (4) is embeddedly connected on the fixed sleeve (2) through the bolt groove (25), and one end of the hexagonal fastening bolt (4) penetrating through the second perforation (26) is threadedly matched with the threaded groove (32).

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