A percutaneous CBT screw fixation system

Abstract

The utility model discloses a percutaneous CBT screw fixing system belongs to medical instrument technical field, including screw rod, still include fixed base, the fixed base sets up as the circular table type of big down little, the fixed base is opened with the U type groove for installing connecting rod, the fixed base includes two groups of integrated fixed wing, the top of fixed wing is inwards and gathers, the inner wall of fixed wing is opened with the thread groove, the outside of fixed wing is opened with two groups of limit hole, the utility model sets up as the circular table type of big down little through the fixed base, simple structure, convenient and practical, can reduce the influence to the spine process, and through setting up limit piece and limit hole cooperation use, can prevent when fixed connecting rod fixed wing to both sides and expand, further reduce the influence to spine, muscle tissue normal tissue etc, benefit accurate nail operation in operation, reduce surgical complication, accord with minimally invasive surgical concept, be favorable to patient rapid recovery.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a percutaneous CBT screw fixation system. Background Technology

[0002] Percutaneous kyphoplasty (CBT), a key technique in percutaneous vertebroplasty, is a minimally invasive treatment for spinal diseases. Guided by imaging equipment, a working channel is inserted into the vertebral body through percutaneous puncture, and materials such as bone cement are injected to restore vertebral height, increase vertebral strength, and relieve pain. It has significant advantages in treating osteoporotic vertebral compression fractures and vertebral tumors, effectively improving patients' quality of life. It is characterized by minimal trauma, rapid recovery, and relatively few complications, providing an effective treatment option for many patients with spinal diseases.

[0003] A search revealed that Chinese Patent Publication No. CN208910453U discloses a pedicle screw, comprising a U-shaped head and a screw shank connected to each other. The screw shank is hollow and has external threads. Multiple side holes are formed at the end of the screw shank away from the U-shaped head, with each side hole sequentially positioned between adjacent threaded teeth. This invention offers optimal fixation strength, facilitates bone cement implantation, prevents screw loosening and slippage, maximizes screw stress distribution, enhances pull-out resistance, accurately screws into the vertebral body via the pedicle, and helps maintain repositioning during drilling and screw implantation. It reduces surgical difficulty, improves surgical quality, ensures blood supply, and achieves better treatment outcomes.

[0004] However, this device also has the following drawbacks:

[0005] The existing percutaneous pedicle screw system used for percutaneous CBT is a traditional pedicle screw fixation. Because the screw and screw tail diameter is relatively large, they are prone to interference with the spinous process. Furthermore, during percutaneous cortical bone screw placement, the screw tail may be squeezed and expand outward to both sides, making it even more likely to interfere with the spinous process. This is not conducive to the precise placement of percutaneous cortical bone screws and may also damage normal tissues such as the spinous process and muscle tissue, which is inconsistent with the concept of minimally invasive surgery. This device does not solve this problem. Utility Model Content

[0006] The purpose of this invention is to provide a percutaneous CBT screw fixation system. By setting the fixing base to a frustum shape with a smaller upper part and a larger lower part, the impact on the spinous process can be reduced. Furthermore, by using a limiting member and a limiting hole in conjunction, the fixing wings can be prevented from expanding outward to both sides when fixing the connecting rod, further reducing the impact on normal tissues such as the spinous process and muscle tissue, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A percutaneous CBT screw fixation system, comprising a screw shank;

[0009] It also includes a fixing seat, which is configured as a frustum-shaped structure with a smaller top and a larger bottom. The fixing seat has a U-shaped groove for installing the connecting rod. The fixing seat includes two sets of integrally formed fixing wings. The top of the fixing wings is tapered inward. The inner wall of the fixing wings has a threaded groove. The outer side of the fixing wings has two sets of limiting holes.

[0010] It also includes a fixing nut, which has a threaded portion that is threadedly connected to a threaded groove. A retainer is rotatably mounted below the threaded portion, and a limiting member is rotatably mounted on the top of the threaded portion. The limiting member slides in conjunction with a limiting hole.

[0011] Preferably, the screw rod is a hollow structure, and the surface of the screw rod is provided with external threads.

[0012] Preferably, the screw rod is inserted into the fixing seat, and a first hexagonal groove is provided inside the lower part of the fixing seat, and the U-shaped groove is slidably engaged with the connecting rod.

[0013] Preferably, the top of the threaded portion has a second hexagonal groove, and the bottom of the card holder abuts against the surface of the connecting rod.

[0014] Preferably, a limiting plate is fixedly installed on the top of the card holder, and a first limiting groove is provided at the bottom of the threaded part, with the limiting plate rotatably engaging with the first limiting groove.

[0015] Preferably, a limiting ring is fixedly installed on the top of the threaded portion, and a second limiting groove is formed on the inner wall of the limiting member, with the limiting ring rotatably engaging with the second limiting groove.

[0016] Preferably, the upper part of the fixing base has an extension arm, and the bottom of the extension arm is engaged with the fixing base.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model features a simple and convenient structure with a frustum-shaped fixation base that is smaller at the top and larger at the bottom. It reduces the impact on the spinous process and, through the use of limiting components and limiting holes, prevents the fixing wings from expanding outwards to both sides when fixing the connecting rod, further reducing the impact on normal tissues such as the spinous process and muscle tissue. This facilitates precise nail placement during surgery, reduces surgical complications, conforms to the concept of minimally invasive surgery, and promotes rapid patient recovery. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the fixed base structure;

[0021] Figure 3 Schematic diagram of the explosion separation structure of the fixed nut;

[0022] Figure 4 This is a schematic diagram of the extension arm structure.

[0023] In the diagram: 1. Screw rod; 2. Fixing seat; 3. U-shaped groove; 4. Fixing wing; 5. Threaded groove; 6. Limiting hole; 7. Fixing nut; 701. Threaded part; 702. Card seat; 703. Limiting component; 704. Limiting plate; 705. First limiting groove; 706. Limiting ring; 707. Second limiting groove; 8. External thread; 9. First hexagonal groove; 10. Second hexagonal groove; 11. Connecting rod; 12. Extension arm. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-4 This utility model provides a technical solution:

[0026] A percutaneous CBT screw fixing system includes a screw rod 1, which is configured as a hollow structure and has external threads 8 on its surface.

[0027] By setting the screw rod 1 to a hollow structure and using it in conjunction with an external guide pin, the screw rod 1 can be accurately screwed into the vertebral body through the pedicle and helps to maintain the repositioning during drilling and screw rod 1 implantation, which can reduce the difficulty of surgical operation.

[0028] It also includes a fixing seat 2, which is a frustum-shaped structure with a smaller top and a larger bottom. The fixing seat 2 has a U-shaped groove 3 for installing the connecting rod 11. The fixing seat 2 includes two sets of integrally formed fixing wings 4. The top of the fixing wings 4 is tapered inward. The inner wall of the fixing wings 4 has a threaded groove 5. The outer side of the fixing wings 4 has two sets of limiting holes 6. The screw rod 1 is inserted into the fixing seat 2. The fixing seat 2 can drive the screw rod 1 to rotate. The bottom of the screw rod 1 can swing. The lower part of the interior of the fixing seat 2 has a first hexagonal groove 9. The U-shaped groove 3 slides with the connecting rod 11. The top of the fixing seat 2 has an extension arm 12. The bottom of the extension arm 12 is engaged with the fixing seat 2.

[0029] By setting the fixation base 2 to a frustum shape with a smaller top and a larger bottom, damage to the spinous process, muscle tissue, etc. can be reduced. The top of the fixation wing 4 is folded inward and a limiting hole 6 is provided to cooperate with the limiting component 703. This prevents the top of the fixation wing 4 from being squeezed outward to both sides when the fixation nut 7 is screwed in, further reducing the impact on normal tissues such as the spinous process and muscle tissue. This facilitates precise nail placement during the operation, reduces surgical complications, conforms to the concept of minimally invasive surgery, and is conducive to the patient's rapid recovery.

[0030] It also includes a fixing nut 7, which includes a threaded portion 701 that is threadedly connected to a threaded groove 5. A retainer 702 is rotatably mounted below the threaded portion 701. A limiting member 703 is rotatably mounted on the top of the threaded portion 701 and slides with a limiting hole 6. A second hexagonal groove 10 is provided on the top of the threaded portion 701. The bottom of the retainer 702 abuts against the surface of the connecting rod 11. A limiting plate 704 is fixedly mounted on the top of the retainer 702. A first limiting groove 705 is provided on the bottom of the threaded portion 701 and rotatably engages with the first limiting groove 705. A limiting ring 706 is fixedly mounted on the top of the threaded portion 701. A second limiting groove 707 is provided on the inner wall of the limiting member 703 and rotatably engages with the second limiting groove 707.

[0031] By setting a fixing nut 7, it can be used in conjunction with the threaded groove 5 to fix the fixing rod in the U-shaped groove 3. Alternatively, the bottom retainer 702 can be used to increase the contact area with the fixing rod, thereby increasing friction and reducing the probability of the fixing rod sliding.

[0032] In practical use, use an external tool with the first hexagonal groove 9 to screw the screw rod 1 into the spine, then insert the connecting rod 11 into the multiple sets of U-shaped grooves 3, move the fixing nut 7 to align the threaded part 701 between the two sets of fixing wings 4, adjust the direction of the card seat 702, adjust the opening direction of the bottom of the card seat 702 to be consistent with the direction of the connecting rod 11, then align the limiting member 703 with the limiting hole 6 and insert it downwards, use an external tool with the second hexagonal groove 10 to tighten the fixing nut 7 downwards to press and fix the connecting rod 11 against the U-shaped groove 3.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A percutaneous CBT screw fixation system, characterized in that: Includes screw rod (1); It also includes a fixing seat (2), which is configured as a frustum shape with a smaller top and a larger bottom. The fixing seat (2) has a U-shaped groove (3) for installing the connecting rod (11). The fixing seat (2) includes two sets of integrally formed fixing wings (4). The top of the fixing wings (4) is folded inward. The inner wall of the fixing wings (4) has a threaded groove (5). The outer side of the fixing wings (4) has two sets of limiting holes (6). It also includes a fixing nut (7), which includes a threaded portion (701) that is threaded to a threaded groove (5). A retainer (702) is rotatably mounted below the threaded portion (701), and a limiting member (703) is rotatably mounted on the top of the threaded portion (701). The limiting member (703) is slidably engaged with a limiting hole (6).

2. The percutaneous CBT screw fixation system according to claim 1, characterized in that: The screw rod (1) is configured as a hollow structure, and the surface of the screw rod (1) is provided with external threads (8).

3. The percutaneous CBT screw fixation system according to claim 1, characterized in that: The screw rod (1) is inserted into the fixing seat (2), and the fixing seat (2) has a first hexagonal groove (9) on its lower interior. The U-shaped groove (3) is slidably engaged with the connecting rod (11).

4. The percutaneous CBT screw fixation system according to claim 1, characterized in that: The top of the threaded part (701) is provided with a second hexagonal groove (10), and the bottom of the card holder (702) abuts against the surface of the connecting rod (11).

5. The percutaneous CBT screw fixation system according to claim 1, characterized in that: A limiting plate (704) is fixedly installed on the top of the card holder (702), and a first limiting groove (705) is provided at the bottom of the threaded part (701). The limiting plate (704) and the first limiting groove (705) are rotatably engaged.

6. The percutaneous CBT screw fixation system according to claim 1, characterized in that: A limiting ring (706) is fixedly installed on the top of the threaded part (701), and a second limiting groove (707) is provided on the inner wall of the limiting member (703). The limiting ring (706) and the second limiting groove (707) are rotatably engaged.

7. The percutaneous CBT screw fixation system according to claim 1, characterized in that: The fixed base (2) has an extension arm (12) above it, and the bottom of the extension arm (12) is engaged with the fixed base (2).

Images