Fixing device for U-shaped tail end of pedicle screw and connecting rod

Abstract

The invention belongs to the technical field of medical instruments, and discloses a fixing device for a U-shaped tail end of a pedicle screw and a connecting rod, which comprises a screw seat, a base is arranged at the bottom of the screw seat, a screw part is arranged in the base and extends to the outside of the base, a first bolt is arranged in the screw seat, and a second bolt is arranged in the first bolt. The bottom of the first bolt penetrates through the base, and an inverted bucket structure is arranged on the outer side of the screw base. By arranging the first bolt, when pedicle surgery is carried out on different positions, the corresponding screw base and the inverted bucket structure are selected according to the surgery condition, then the selected screw base and the base are combined together, then the first bolt is vertically screwed in along the inner cavity of the screw head, and the screw base and the base are combined; therefore, various pedicle screws can be provided by replacing different types of screw seats and inverted bucket structures, so that the pedicle screws are suitable for different operation requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of medical instruments, and in particular is a fixing device for a U-shaped tail at the tail end of a pedicle screw and a connecting rod. Background Art

[0002] Pedicle screws are an internal fixation structure used in spinal surgery. They are mainly used to treat thoracic and lumbar fractures, slippage, and deformities. They can effectively fix the spine and prevent further damage to the spine or worsening of deformities.

[0003] When a patient has a fracture in the prior art, a pedicle screw fixation device is generally used. The pedicle screw is implanted into the pedicle, and then a connecting rod is placed in the hanging bucket structure at the tail end of the screw, and a clamping nut is screwed into the nut to fix the connecting rod, so as to reinforce the fracture and facilitate healing. However, when used in special circumstances, since the pedicle screw and the top hanging bucket structure are integrated into one piece, when the pedicle screw is implanted into the pedicle at different positions, the pedicle screw needs to be installed first and then implanted into the pedicle, and then the clamping nut is screwed in, and other styles of bucket structures are installed on the clamping nut, resulting in an increase in the size of the overall structure, which cannot be applied to the needs of different surgeries, and affects the patient's healing and subsequent disassembly, so it needs to be improved. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a fixing device for a U-shaped tail of a pedicle screw and a connecting rod, which has the advantage of being suitable for use in different occasions.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fixing device for a U-shaped tail of a pedicle screw and a connecting rod, comprising a screw seat, a base is arranged at the bottom of the screw seat, a screw member is arranged inside the base, the screw member extends to the outside of the base, a first bolt is arranged inside the screw seat, the bottom of the first bolt passes through the base, an inverted bucket structure is opened on the outside of the screw seat, a connecting rod is arranged inside the inverted bucket structure, and a compression screw is threadedly sleeved on the top of the screw seat;

[0006] Wherein, the screw seat comprises a screw head, the top of the inner side of the screw head is provided with an internal thread, and the bottom of the screw head is provided with a limiting groove;

[0007] The base comprises a bottom platform, a limiting rod located inside a limiting groove is arranged on the top of the bottom platform, and a notch is opened on the bottom of the bottom platform.

[0008] Preferably, a groove is formed at the bottom of the screw head, and the size of the groove matches the size of the first bolt.

[0009] Preferably, the screw member comprises a cortical thread and a cancellous thread, and the top of the cortical thread is connected to the bottom of the base.

[0010] Preferably, four limiting rods are provided, and the four limiting rods are in the shape of a flat-headed cone.

[0011] Preferably, the bucket structure has a U-shape, and the bucket structure is adapted to the width of the connecting rod.

[0012] Preferably, a hanging bucket structure is arranged on the outside of the screw head, and a placement groove is opened inside the hanging bucket structure.

[0013] Preferably, a second bolt is threadedly sleeved in the inner cavity of the bucket structure, and a screw structure is provided at the bottom of the inner cavity of the bucket structure.

[0014] Preferably, the clamping screw comprises a screw rod, an outer surface of the screw rod is matched with an internal thread, and slots are provided on both sides of the screw rod.

[0015] Preferably, a nut is sleeved on the top thread of the outer surface of the screw.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention sets a first bolt, and when performing pedicle surgery at different positions, a corresponding screw seat and a reverse bucket structure are selected according to the surgical conditions, and then the selected screw seat and the base are combined together, and then the first bolt is vertically screwed into the inner cavity of the screw head, and the screw seat and the base are combined to complete the pedicle screw required for the surgery, thereby providing a variety of pedicle screws by replacing screw seats and reverse bucket structures of different styles, so that they are suitable for different surgical needs.

[0018] The present invention sets a screw rod and a nut, and separates the screw rod and the nut so that when installing the screw head and the split bucket structure, the screw rod is screwed into the inner side of the internal thread, and then the split bucket structure is clamped and installed on the top of the screw rod, and the nut is installed on the top of the screw rod. Through the extrusion between the nut and the screw head, the split bucket structure is fixed on the screw seat, thereby facilitating the operator to use the transverse process fixation to meet surgical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation of the fixed screw seat of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the screw seat of the present invention;

[0022] Figure 4 It is a schematic structural diagram of a cross-section of the base platform of the present invention;

[0023] Figure 5 This is a schematic diagram of the installation structure of the split screw seat of the present invention;

[0024] Figure 6 This is a schematic diagram of the combined structure of the split screw seat of the present invention;

[0025] Figure 7 It is a schematic structural diagram of a cross-section of the base platform of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the screw head of the present invention;

[0027] Fig. 9 It is a structural schematic diagram of a cross-section of a screw head of the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the Z-shaped screw seat of the present invention.

[0029] In the figure: 1. screw seat; 101. screw head; 102. internal thread; 103. groove; 104. limit groove; 2. base; 201. base; 202. limit rod; 203. notch; 3. screw member; 301. leather thread; 302. loose thread; 4. bucket structure; 5. connecting rod; 6. tightening screw; 7. first bolt. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figures 1 to 10 As shown, it is the first embodiment of the present invention, which provides a fixing device for a U-shaped tail of a pedicle screw and a connecting rod, comprising a screw seat 1, a base 2 is arranged at the bottom of the screw seat 1, a screw member 3 is arranged inside the base 2, the screw member 3 extends to the outside of the base 2, a first bolt 7 is arranged inside the screw seat 1, the bottom of the first bolt 7 passes through the base 2, an inverted bucket structure 4 is opened on the outside of the screw seat 1, a connecting rod 5 is arranged inside the inverted bucket structure 4, and a compression screw 6 is threadedly sleeved on the top of the screw seat 1;

[0033] The screw seat 1 includes a screw head 101, an inner thread 102 is provided at the top of the inner side of the screw head 101, and a limiting groove 104 is provided at the bottom of the screw head 101;

[0034] The base 2 includes a bottom platform 201 . A limiting rod 202 located inside the limiting groove 104 is arranged on the top of the bottom platform 201 . A notch 203 is opened at the bottom of the bottom platform 201 .

[0035] When performing surgery on pedicles at different positions, by selecting a matching screw seat 1 and inverted bucket structure 4, the limiting rod 202 on the top of the base 201 is inserted into the limiting groove 104 to limit the screw seat 1 and the base 2, and then the first bolt 7 is screwed into the base 2 through the inner cavity of the screw head 101 to fix the screw seat 1 and the base 2 as a whole, so that they are combined into the pedicle screw required for the operation. Through the diversified inverted bucket structure 4 and the screw seat 1, it is suitable for different surgical needs, avoiding the combined structure from affecting the treatment, and bringing convenience to the operator.

[0036] The fixed screw seat 1 is configured as a "Z"-shaped structure as a whole, and a hanging bucket structure is provided on the outside thereof, such as Figure 2 A hole is opened on the outside of the "Z"-shaped structure, and the outside of the "Z"-shaped structure extends to the transverse process, and the connecting rod 5 is placed in the inverted bucket structure 4. The compression screw 6 is screwed into the inner cavity of the screw seat 1, and the connecting rod 5 in the inverted bucket structure 4 is fixed by the compression screw 6. The bottom of the "Z"-shaped structure fits the surface of the transverse process, so that the transverse process short screw is implanted through the hole to increase the fusion stability, so that by replacing different forms of screw seats 1 and inverted bucket structures 4, sufficient fixation strength can be provided in special circumstances, especially in the case of osteoporosis or bone destruction, the transverse process short screw can be used as an auxiliary fixation device to improve the stability of the entire fixation system, and at the same time, it can also disperse the stress on the pedicle screws and reduce the risk of screw loosening or breakage to meet the needs of different surgeries;

[0037] And when there is no hanging bucket structure on the outside of the screw seat 1, its installation method is the same as that of the fixed screw seat 1, such as Figure 3 ;

[0038] At the same time, the "Z"-shaped structure of the screw seat 1 is also set to a split type. By separating the screw seat 1 from the outer connecting bucket structure, a slot hole is opened on the top of the split bucket structure, and during installation, the threaded part of the top of the screw rod is set into a slot hole shape, such as Figure 1 When it is necessary to fix the surface of the transverse protrusion, the top of the screw rod is passed through the slot on the split bucket structure, and then the screw rod is screwed into the top of the screw seat 1, and the bucket structure is limited by the screw rod to prevent it from moving after installation. Then, the bucket structure and the transverse protrusion are connected together by the screw structure at the bottom of the bucket structure, and the connecting rod 5 is placed in the inner cavity of the bucket structure, and the second bolt is screwed in to fix the connecting rod 5, so as to achieve fixation between the transverse protrusions, forming a structure as shown in the figure. Figure 6shape, so that the corresponding fixation device can be adapted according to different surgical situations to meet the needs of surgery.

[0039] Example 2

[0040] like Figure 7 and Fig. 9 As shown, this embodiment includes the features of the embodiment 1, and the distinguishing technical feature is that a groove 103 is provided at the bottom of the screw head 101, and the size of the groove 103 is adapted to the size of the first bolt 7;

[0041] By screwing the first bolt 7 into the groove 103 and since the groove 103 is adapted to the size of the end of the first bolt 7, when assembled and installed, the first bolt 7 is limited by the groove 103, making it convenient for the operator to install between the screw seat 1 and the base 2, which brings convenience to the operator.

[0042] The screw member 3 includes a cortical thread 301 and a cancellous thread 302, and the top of the cortical thread 301 is connected to the bottom of the base 201;

[0043] When performing different surgeries, different implantation angles are used according to different scenarios to stabilize the overall installation and use of the pedicle screw, improve the fixation effect of the screw and reduce complications. At the same time, by setting the thread on the screw to a cortical thread 301 and a cancellous thread 302, the cancellous thread 302 needs to be pre-tapped during the implantation process, and the thread is carved into the cortical bone by a tap to ensure that the screw can be firmly fixed on the cortical bone, and the cortical thread 301 can better engage the surrounding bone through a very deep thread to provide sufficient fixation strength, thereby enhancing the pull-out resistance, enhancing stability and reducing complications through the cortical thread 301 and the cancellous thread 302, and reducing the risk of screw loosening, breakage, etc.

[0044] There are four limit rods 202, and the four limit rods 202 are in the shape of a flat-headed cone.

[0045] When the base 201 and the screw head 101 are combined, four limit rods 202 are used to limit the base 201 and the screw head 101 to prevent position displacement, and the shape design of the four limit rods 202 makes it easy to insert the four limit rods 202 into the inner cavity of the limit groove 104, which improves the installation efficiency and brings convenience to the operator.

[0046] The bucket structure 4 has a U-shaped appearance, and the bucket structure 4 is adapted to the width of the connecting rod 5;

[0047] The "U"-shaped inverted bucket structure 4 makes it convenient for operators to install the connecting rod 5 inside the screw seat 1, making it easy to fix the U-shaped tail of the pedicle screw tail end and the connecting rod 5, which is convenient for surgical use.

[0048] Example 3

[0049] like Figure 1 , Figure 5 and Figure 6 As shown, this embodiment includes the features of the embodiment 1, and the distinguishing technical feature is that a hanging bucket structure is arranged outside the screw head 101, and a placement groove is arranged inside the hanging bucket structure;

[0050] Since a screw seat 1 connected to the screw head 101 and the hanging bucket structure is arranged on the outside of the screw head 101, and a screw seat 1 that is detachable from the screw head 101 and the hanging bucket structure is also arranged, different styles of screw seats 1 can be used according to different surgical needs to ensure the stability of the vertebrae of the spine, promote fracture healing or correct spinal deformity.

[0051] Wherein, a second bolt is threadedly sleeved in the inner cavity of the bucket structure, and a screw structure is arranged at the bottom of the inner cavity of the bucket structure;

[0052] The connecting rod 5 placed in the inner cavity of the bucket structure is fixed by a second bolt during installation so that it is used for connection between the transverse protrusions to prevent fixed connection between the transverse protrusions.

[0053] The clamping screw 6 includes a screw rod, the outer surface of which is matched with the internal thread 102, and slots are provided on both sides of the screw rod;

[0054] When installing the split bucket structure, the bottom of the screw is screwed into the internal thread 102, and the split bucket structure is clamped on the top of the screw. The clamping groove is formed to limit the split bucket structure on the screw to prevent position movement after installation.

[0055] Wherein, a nut is sleeved on the top thread of the outer surface of the screw;

[0056] When the split bucket structure is installed on the screw rod, the split bucket structure is clamped and fixed between the screw head 101 and the nut by rotating the nut to prevent it from moving, thereby ensuring the stability of the bucket structure fixation.

[0057] The working principle and use process of the present invention:

[0058] First, when the operator is performing surgery on pedicles at different positions, he / she checks the styles of the screw seat 1 and the bucket structure 4 that need to be replaced. After the selection is completed, the limiting rod 202 on the top of the base 201 is clamped into the inner cavity of the limiting groove 104, and the first bolt 7 is placed into the inner cavity of the screw head 101 so that it falls into the groove 103. The first bolt 7 is clamped into the inside of the base 2 by rotation, so that the screw seat 1 and the base 2 are combined together, and then the combined screws are operated on to be implanted into the pedicles, the connecting rod 5 is placed in the bucket structure 4, the screw and the nut are combined together, and the screw is screwed into the bucket structure 4 through the nut to complete the installation of the connecting rod 5, thereby combining different styles of pedicle screws according to different surgical positions to meet the needs of surgery in different occasions and facilitate the use of operators.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod, comprising a screw seat (1), characterized in that: The screw seat (1) is provided with a base (2) at the bottom, a screw member (3) is provided inside the base (2), the screw member (3) extends to the outside of the base (2), a first bolt (7) is provided inside the screw seat (1), the bottom of the first bolt (7) passes through the base (2), an inverted bucket structure (4) is provided on the outside of the screw seat (1), a connecting rod (5) is provided inside the inverted bucket structure (4), and a clamping screw (6) is threadedly sleeved on the top of the screw seat (1); The screw seat (1) comprises a screw head (101), the top of the inner side of the screw head (101) is provided with an internal thread (102), and the bottom of the screw head (101) is provided with a limiting groove (104); The base (2) comprises a bottom platform (201), a limiting rod (202) located inside the limiting groove (104) is arranged on the top of the bottom platform (201), and a notch (203) is opened at the bottom of the bottom platform (201).

2. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: A groove (103) is provided at the bottom of the screw head (101), and the size of the groove (103) is matched with the size of the first bolt (7).

3. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: The screw member (3) comprises a cortical thread (301) and a cancellous thread (302), and the top of the cortical thread (301) is connected to the bottom of the base (201).

4. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: Four limiting rods (202) are provided, and the four limiting rods (202) are in the shape of a flat-headed cone.

5. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: The bucket structure (4) has a "U" shape, and the bucket structure (4) is adapted to the width of the connecting rod (5).

6. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: A hanging bucket structure is arranged outside the screw head (101), and a placement groove is arranged inside the hanging bucket structure.

7. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 6, characterized in that: The inner cavity of the bucket structure is threadedly sleeved with a second bolt, and the bottom of the inner cavity of the bucket structure is provided with a screw structure.

8. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 1, characterized in that: The clamping screw (6) comprises a screw rod, the outer surface of which is matched with the internal thread (102), and slots are provided on both sides of the screw rod.

9. A fixing device for a U-shaped tail of a pedicle screw and a connecting rod according to claim 8, characterized in that: The top thread of the outer surface of the screw rod is sleeved with a nut.

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