Implant for percutaneous minimally invasive thoracolumbar vertebral fracture

Abstract

The invention relates to the technical field of bone implants for minimally invasive surgery, and particularly discloses an implant for percutaneous minimally invasive thoracolumbar vertebral fracture, which comprises a vertebral body forming body, the vertebral body forming body comprises a vertebral body forming body head and a plurality of blade parts arranged at the rear end of the vertebral body forming body head in a surrounding manner, the vertebral body forming body head is provided with a needle guide hole penetrating along the axial direction, and the needle guide hole is communicated with the blade parts; a containing cavity is defined by the blade parts; the front end of the threaded guide rod and the head of the cone forming body are integrally formed, the needle guide hole penetrates through the threaded guide rod in the axial direction, and the rear end of the threaded guide rod extends out of the containing cavity; the pedicle screw is provided with a threaded hole penetrating in the axial direction, the threaded hole is in threaded connection with the threaded guide rod, the pedicle screw comprises a screw head and a threaded part arranged at the rear end of the screw head, and the screw head is arranged in the containing cavity and expands the blade part. According to the implant for the percutaneous minimally invasive thoracolumbar vertebral fracture, surgical wounds are reduced, the vertebral restoration effect is good, the stability of a vertebral formed body is guaranteed, and the surgical time can be saved.

Description

Technical Field

[0001] The present invention relates to the technical field of minimally invasive bone implants, in particular to a percutaneous minimally invasive implant for thoracic and lumbar vertebral fractures. Background Art

[0002] Thoracolumbar vertebral fractures are the most common spinal fractures. Surgical interventions are trending towards minimally invasive treatments, such as percutaneous pedicle screw fixation and percutaneous vertebroplasty for osteoporotic thoracolumbar vertebral fractures. Current percutaneous vertebroplasty procedures primarily utilize balloon angioplasty and vertebral stent systems to distract and shape the fractured vertebra. These procedures are complex, have limited indications, and offer room for improvement in vertebral reduction effectiveness, but cannot guarantee vertebroplasty stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a percutaneous minimally invasive implant for thoracolumbar vertebral fractures, which reduces surgical trauma, achieves a good vertebral reduction effect, enhances the internal stability of the fractured vertebra, ensures the stability of the vertebroplasty body, and can save surgical time.

[0004] In order to achieve the above-mentioned object, the present invention provides a percutaneous minimally invasive implant for thoracolumbar vertebral fractures, comprising:

[0005] A vertebroplasty body, comprising a vertebroplasty body head and a plurality of blades surrounding a rear end of the vertebroplasty body head, wherein the vertebroplasty body head has a guide pin hole extending axially therethrough, and the blades enclose a receiving cavity;

[0006] a threaded guide rod, the front end of which is integrally formed with the head of the vertebroplasty body, the guide pin hole axially passes through the threaded guide rod, and the rear end of the threaded guide rod extends out of the accommodating cavity; and

[0007] A pedicle screw has a threaded hole that passes through in the axial direction, the threaded hole is threadedly connected to the threaded guide rod, the pedicle screw includes a screw head and a threaded portion arranged at the rear end of the screw head, the screw head is arranged in the accommodating cavity and supports the blade portion, and the rear end of the threaded portion extends out of the accommodating cavity.

[0008] In some embodiments, the vertebroplasty body is in the shape of a hexagonal prism, and the number of the blade portions is six.

[0009] In some embodiments, the outer wall of the threaded guide rod is spaced apart from the inner wall of the blade portion.

[0010] In some embodiments, the screw head is in a truncated cone shape, and the front end diameter of the screw head is smaller than the rear end diameter of the screw head.

[0011] In some embodiments, the outer peripheral wall of the screw head abuts against the inner wall of the blade portion, so that the rear end of the blade portion is radially expanded.

[0012] In some embodiments, the pedicle screw includes a connecting portion disposed between the screw head and the threaded portion.

[0013] In some embodiments, the pedicle screw includes a screw tail portion disposed at a rear end of the threaded portion, and the threaded hole passes through the screw tail portion.

[0014] In some embodiments, the outer wall of the vertebroplasty body is provided with a bioactive coating.

[0015] In some embodiments, the outer surface of the threaded portion is provided with a bioactive coating.

[0016] The present invention provides a percutaneous minimally invasive implant for thoracic and lumbar vertebral fractures. Compared with the prior art, its beneficial effects are:

[0017] The vertebroplasty body includes a vertebroplasty head and a plurality of blades surrounding the rear end of the vertebroplasty head. The vertebroplasty head has a guide pin hole extending axially therethrough, and the blades enclose a receiving cavity. The front end of the threaded guide rod is integrally formed with the vertebroplasty head, and the guide pin hole extends axially through the threaded guide rod. The rear end of the threaded guide rod extends out of the receiving cavity. The pedicle screw has a threaded hole extending axially therethrough, the threaded hole being threadedly connected to the threaded guide rod. The pedicle screw includes a screw head and a threaded portion disposed at the rear end of the screw head. The screw head is disposed in the receiving cavity and spreads the blades, and the rear end of the threaded portion extends out of the receiving cavity. Thus, by screwing the pedicle screw onto the threaded guide rod, the screw head spreads the blades, achieving fracture reduction within the fractured vertebral body, reducing surgical trauma to tissues outside the fractured vertebral body, achieving a better vertebral reduction effect, enhancing internal stability of the fractured vertebral body, ensuring stability of the vertebroplasty body, and saving surgical time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the three-dimensional structure of an implant for percutaneous minimally invasive thoracolumbar vertebral fracture treatment provided in some embodiments of the present invention.

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of an implant for percutaneous minimally invasive thoracolumbar vertebral fracture treatment provided in some embodiments of the present invention, with the blade portion not expanded.

[0020] Figure 3 Schematic diagram of the structure of a vertebroplasty body and a threaded guide rod of an implant for percutaneous minimally invasive thoracolumbar vertebral fracture treatment provided by some embodiments of the present invention.

[0021] Figure 4 This is a schematic diagram of the enlarged structure of a pedicle screw implant for percutaneous minimally invasive thoracolumbar vertebral fracture treatment provided in some embodiments of the present invention.

[0022] In the figure: 1. Vertebroplasty body; 11. Vertebroplasty body head; 12. Blade portion; 13. Guide pin hole; 14. Accommodation cavity; 2. Threaded guide rod; 3. Pedicle screw; 31. Threaded hole; 32. Screw head; 33. Threaded portion; 34. Connecting portion; 35. Screw tail. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0024] It should be understood that in the description of this application, the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0025] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1-Figure 4 As shown, some embodiments of the present invention include a percutaneous minimally invasive implant for thoracolumbar vertebral fractures, comprising a vertebroplasty body 1, a threaded guide rod 2, and a pedicle screw 3. During percutaneous vertebroplasty, the vertebroplasty body 1 and threaded guide rod 2 are precisely implanted into the vertebral body to be reduced using a percutaneous needle.

[0027] The vertebroplasty body 1 comprises a vertebroplasty head 11 and a plurality of blades 12 surrounding the rear end of the vertebroplasty head 11. The vertebroplasty head 11 has an axially extending guide pin hole 13, and the blades 12 enclose a receiving cavity 14. During percutaneous vertebroplasty, the vertebroplasty body is fully implanted in the vertebral body to be repositioned.

[0028] The front end of the threaded guide rod 2 is integrally formed with the vertebroplasty head 11, and a guide pin hole 13 axially extends through the threaded guide rod 2. The rear end of the threaded guide rod 2 extends out of the accommodating cavity 14. During percutaneous vertebroplasty, the excess portion of the rear end of the threaded guide rod 2 that extends beyond the rear end of the pedicle screw 3 needs to be removed.

[0029] The pedicle screw 3 has a threaded hole 31 extending axially therethrough, which is threadedly connected to a threaded guide rod. The pedicle screw 3 includes a screw head 32 and a threaded portion 33 disposed at the rear end of the screw head 32. The screw head 32 is disposed in the accommodating cavity 14 and supports the blade portion 12. The rear end of the threaded portion 33 extends out of the accommodating cavity 14. Specifically, the front end of the threaded portion 33 has a coarse thread, which increases the contact area with the trabeculae, improving mechanical stability and bone induction area. The rear end of the threaded portion 33 has a fine thread, which is used to anchor the screw in the pedicle and provide strong biomechanical stability.

[0030] Based on the above-mentioned structural setting, by screwing the pedicle screw 3 on the threaded guide rod 2, the screw head 32 is allowed to expand the blade part 12, thereby applying pressure to the vertebral part that needs to be reduced, and the fracture reduction is achieved within the fractured vertebral body, reducing the trauma of the surgery to the tissue outside the fractured vertebra, achieving a good vertebral reduction effect, ensuring the stability of the vertebral body shaping body, reducing the damage to the surrounding muscles and ligaments under the reduction and traction tension, and saving operation time.

[0031] like Figure 1 As shown, in some embodiments, the vertebroplasty body 1 is prismatic in shape, and the blades 12 are spaced apart from each other.

[0032] For example, the vertebroplasty body 1 is in the shape of a hexagonal prism, and the blade portions 12 are provided with six blades.

[0033] like Figure 2 As shown, in some embodiments, the outer wall of the threaded guide rod 2 is spaced apart from the inner wall of the blade portion 12. This makes it convenient for the screw head 32 to be screwed into between the threaded guide rod 2 and the blade portion 12 to open the blade portion 12.

[0034] like Figure 4 As shown, in some embodiments, the screw head 32 is in a truncated cone shape, and the front diameter of the screw head 32 is smaller than the rear diameter of the screw head 32. In this way, the screw head 32 can be smoothly inserted into the accommodating cavity 14 and open the blade portion.

[0035] like Figure 4As shown, in some embodiments, the outer wall of the screw head 32 abuts the inner wall of the blade portion 12, causing the rear end of the blade portion 12 to be radially expanded. This enhances vertebral reduction and the pressure-fit between the bioactive coating of the blade portion 12 and the trabecular bone, promoting bone induction and providing strong self-stabilization. This eliminates the need for external pedicle rod fixation, saves surgical time, and minimizes secondary injuries.

[0036] like Figure 4 As shown, in some embodiments, the pedicle screw 3 includes a connecting portion 34, which is provided between the screw head 32 and the threaded portion 33. The connecting portion 34 allows the screw head 32 to be smoothly inserted into the accommodating cavity 14.

[0037] like Figure 4 As shown, in some embodiments, the pedicle screw 3 includes a screw tail 35 provided at the rear end of the threaded portion 33, and the threaded hole 31 passes through the screw tail 35. Specifically, the screw tail 35 has anti-slip grooves or adopts a hexagonal prism shape for easy screwing.

[0038] In some embodiments, the outer wall of the vertebroplasty body 1 is provided with a bioactive coating. The bioactive coating is used to promote bony chemical bonding and improve biocompatibility between the vertebroplasty body 1 and host tissue. The bioactive coating achieves antibacterial and osteointegration-promoting effects by manipulating its chemical composition (e.g., strontium / zinc ion doping, collagen) and physical structure (micro-nanomorphology, porosity gradient).

[0039] In some embodiments, the outer surface of the threaded portion 33 is provided with a bioactive coating. The bioactive coating is used to promote bony chemical bonding and improve biocompatibility between the threaded portion 33 and the host tissue. The bioactive coating achieves antibacterial and osteointegration-promoting effects by manipulating its chemical composition (e.g., strontium / zinc ion doping, collagen) and physical structure (micro-nanomorphology, porosity gradient).

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A percutaneous minimally invasive implant for thoracolumbar vertebral fractures, characterized in that: include: A vertebroplasty body, comprising a vertebroplasty body head and a plurality of blades surrounding a rear end of the vertebroplasty body head, wherein the vertebroplasty body head has a guide pin hole extending axially therethrough, and the blades enclose a receiving cavity; a threaded guide rod, the front end of which is integrally formed with the head of the vertebroplasty body, the guide pin hole axially passes through the threaded guide rod, and the rear end of the threaded guide rod extends out of the accommodating cavity; and A pedicle screw has a threaded hole that passes through in the axial direction, the threaded hole is threadedly connected to the threaded guide rod, the pedicle screw includes a screw head and a threaded portion arranged at the rear end of the screw head, the screw head is arranged in the accommodating cavity and supports the blade portion, and the rear end of the threaded portion extends out of the accommodating cavity.

2. The percutaneous minimally invasive implant for thoracolumbar vertebral fracture according to claim 1, characterized in that: The vertebral body forming body is in a prismatic shape, and the blade parts are arranged at intervals.

3. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 2, characterized in that: The vertebral body shaping body is in the shape of a hexagonal prism, and is provided with six blade parts.

4. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The outer wall of the threaded guide rod is spaced apart from the inner wall of the blade portion.

5. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The screw head is in a truncated cone shape, and the front end diameter of the screw head is smaller than the rear end diameter of the screw head.

6. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 5, characterized in that: The outer peripheral wall of the screw head abuts against the inner wall of the blade portion, so that the rear end of the blade portion is radially expanded.

7. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The pedicle screw includes a connecting portion disposed between the screw head and the threaded portion.

8. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The pedicle screw includes a screw tail portion arranged at the rear end of the threaded portion, and the threaded hole passes through the screw tail portion.

9. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The outer wall of the vertebroplasty body is provided with a bioactive coating.

10. The implant for percutaneous minimally invasive thoracolumbar vertebral fracture according to claim 1, characterized in that: The outer surface of the threaded portion is provided with a bioactive coating.

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