Disposable intervertebral fusion device with push rod

Abstract

The utility model discloses a disposable interbody fusion device with push rods. The disposable interbody fusion device comprises a plastic outer push rod, a metal inner push rod, an interbody fusion cage and a plastic push rod rotating handle. A through hole is formed in the plastic outer push rod in the axial direction. The metal inner push rod is inserted into the through hole, and the two ends of the metal inner push rod extend out of the plastic outer push rod. The interbody fusion cage is in threaded connection with one end of the metal inner push rod; the plastic push rod rotating handle is connected with the other end of the metal inner push rod, and the plastic push rod rotating handle can be operated to rotate and drive the metal inner push rod to rotate, so that the interbody fusion cage and the metal inner push rod are separated from threaded connection. According to the disposable interbody fusion device with the push rod, the interbody fusion cage and the push rod are used as a whole so as to be disposable, and cross infection is effectively avoided. The plastic outer push rod and the plastic push rod rotary handle can reduce cost and weight, improve holding performance, and enable implantation operation to be simpler and more convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a disposable intervertebral fusion device with a push rod. Background Art

[0002] Existing intervertebral fusion devices and implantation tools are separate structures, and the implantation tools need to be sterilized separately before use. They need to be cleaned and disinfected after use so that they can be reused repeatedly. Repeated use of the implantation tool will cause damage to the interface between it and the intervertebral fusion device, making it impossible to smoothly install or remove the intervertebral fusion device. The repeated use of the implantation tool requires cleaning, disinfection and sterilization, but incorrect or incomplete operation of the aforementioned may lead to bacterial infection, pyrogenic reaction, etc. in the patient after the operation. The repeated use of the implantation tool will also lead to complicated preoperative instrument preparation, and one or more implantation tools need to be prepared, thereby increasing the relevant workload. In addition, the existing implantation tools are not easy to hold, and are prone to slipping during surgical operations, which is not conducive to the progress of the operation.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0004] The purpose of the utility model is to provide a disposable intervertebral fusion device with a push rod, which can reduce infection and is easier to operate.

[0005] To achieve the above objectives, a specific embodiment of the present invention provides a disposable intervertebral fusion device with a push rod, comprising: a plastic outer push rod, a metal inner push rod, an intervertebral fusion device, and a plastic push rod rotary handle. The plastic outer push rod has an axial through hole; the metal inner push rod is inserted into the through hole, with both ends extending outside the plastic outer push rod; the intervertebral fusion device is threadedly connected to one end of the metal inner push rod; and the plastic push rod rotary handle is connected to the other end of the metal inner push rod. The plastic push rod rotary handle can be operated to rotate and drive the metal inner push rod to rotate, thereby disengaging the intervertebral fusion device from the threaded connection with the metal inner push rod.

[0006] In one or more embodiments of the present invention, a limiting groove is provided on one side of the intervertebral fusion device close to the plastic outer push rod, and a limiting portion is provided on the end of the plastic outer push rod close to the intervertebral fusion device, and the limiting portion is configured to be inserted into the limiting groove.

[0007] In one or more embodiments of the present invention, a threaded hole is provided on one side of the intervertebral fusion device close to the plastic outer push rod, and a threaded column is provided on one end of the metal inner push rod, and the threaded column is configured to be screwed into the threaded hole.

[0008] In one or more embodiments of the present invention, a plurality of anti-recession teeth are provided on the surface of the intervertebral fusion cage.

[0009] In one or more embodiments of the present invention, a bone graft filling groove is provided on the intervertebral fusion cage for accommodating bone graft material.

[0010] In one or more embodiments of the present invention, the intervertebral fusion cage is selected from one of trapezoidal, straight or kidney-shaped.

[0011] In one or more embodiments of the present invention, the plastic outer push rod is provided with a plurality of annular grooves spaced apart along the axial direction to form a gripping portion for gripping.

[0012] In one or more embodiments of the present invention, the outer peripheral surface of the push rod handle is provided with two arc-shaped rotating surfaces opposite to each other along the axial direction.

[0013] In one or more embodiments of the present invention, the plastic push rod handle is provided with an accommodating hole along its axial direction, which is configured to accommodate and fix the other end of the metal inner push rod.

[0014] In one or more embodiments of the present invention, the plastic push rod handle is radially provided with a first fixing hole connected to the accommodating hole, and the other end of the metal inner push rod is radially provided with a second fixing hole, and fixing pins are inserted into the first fixing hole and the second fixing hole to fix the plastic push rod handle to the metal inner push rod.

[0015] Compared with the existing technology, the disposable intervertebral fusion device with a push rod of the present invention combines the intervertebral fusion device and the push rod as a whole, which can be sterilized by gamma irradiation for disposable use, effectively avoiding cross infection caused by repeated use of the push rod. The plastic outer push rod and the plastic push rod handle have lower cost and weight than the stainless steel equipment commonly used in the industry, making the implantation operation of the intervertebral fusion device simpler and more convenient. The intervertebral fusion device and the plastic outer push rod are provided with limiting grooves and limiting parts to prevent the two from sliding. In addition, a plurality of annular grooves are arranged at intervals on the plastic outer push rod to form a gripping part for holding, which improves the gripping ability of the plastic outer push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts.

[0017] Figure 1This is a three-dimensional diagram of a disposable intervertebral fusion device with a push rod in one embodiment of the present invention;

[0018] Figure 2 This is a plan view of a disposable intervertebral fusion device with a push rod in one embodiment of the present invention;

[0019] Figure 3 for Figure 2 Sectional view along the AA axis;

[0020] Figure 4 This is a first exploded view of a disposable intervertebral fusion device with a push rod in one embodiment of the present invention;

[0021] Figure 5 This is a second exploded view of a disposable intervertebral fusion device with a push rod in one embodiment of the present invention;

[0022] Figure 6 Schematic diagram of an intervertebral fusion cage with different structures in one embodiment of the present invention.

[0023] Description of main reference numerals:

[0024] 1-Plastic outer push rod, 11-Through hole, 12-Limiting part, 13-Annular groove, 2-Metal inner push rod, 21-Threaded column, 22-Second fixing hole, 3-Intervertebral fusion device, 31-Limiting groove, 32-Threaded hole, 33-Anti-retraction tooth, 34-Bone graft filling groove, 4-Plastic push rod handle, 41-Arcuate rotating surface, 42-Accommodating hole, 43-First fixing hole, 44-Fixing pin. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0026] like Figure 1-6As shown, a disposable intervertebral fusion device with a push rod in one embodiment of the utility model comprises: a plastic outer push rod 1, a metal inner push rod 2, an intervertebral fusion device 3 and a plastic push rod rotary handle 4. The plastic outer push rod 1 is provided with a through hole 11 along the axial direction. The metal inner push rod 2 is inserted into the through hole 11 and its two ends extend out of the plastic outer push rod 1. The intervertebral fusion device 3 is threadedly connected to one end of the metal inner push rod 2. The plastic push rod rotary handle 4 is connected to the other end of the metal inner push rod 2, and the plastic push rod rotary handle 4 can be operated to rotate and drive the metal inner push rod 2 to rotate, thereby disengaging the intervertebral fusion device 3 from the metal inner push rod 2 from the threaded connection.

[0027] The operating principle of this disposable intervertebral fusion device with a push rod is as follows: the operator holds the plastic outer push rod 1 and manually pushes the intervertebral fusion device 3 at the end of the metal inner push rod 2, or uses a corresponding surgical tool to hammer the rear end of the plastic push rod handle 4, so that the intervertebral fusion device 3 is implanted in the corresponding intervertebral disc position. Once the intervertebral fusion device 3 is fixed in place, the operator rotates the plastic push rod handle 4 to separate the end of the metal inner push rod 2 from the threaded connection of the intervertebral fusion device 3. The plastic outer push rod 1, metal inner push rod 2, and intervertebral fusion device 3 are separated, completing the implantation of the intervertebral fusion device 3.

[0028] This disposable intervertebral fusion device with push rod incorporates the intervertebral fusion cage 3 as a single unit, which can be sterilized using gamma irradiation for single-use, effectively preventing cross-contamination from reuse of the outer and inner push rods. The plastic outer push rod 1 and plastic push rod handle 4 reduce costs by over 80% and weight by over 70% compared to conventional stainless steel devices, making implantation of the intervertebral fusion cage 3 simpler and more convenient.

[0029] In one embodiment, if Figure 3 and Figure 5 As shown, the connection between the intervertebral fusion cage 3 and the metal inner push rod 2 can be as follows: a threaded hole 32 is defined on the side of the intervertebral fusion cage 3 adjacent to the plastic outer push rod 1, and a threaded post 21 is provided at one end of the metal inner push rod 2. The threaded post 21 is configured to screw into the threaded hole 32, thereby achieving a threaded connection between the intervertebral fusion cage 3 and the metal inner push rod 2. With this arrangement, the operator can rotate the plastic push rod handle 4 counterclockwise to cause the metal inner push rod 2 to rotate counterclockwise relative to the intervertebral fusion cage 3, thereby separating the metal inner push rod 2 from the intervertebral fusion cage 3.

[0030] Furthermore, a limiting groove 31 is defined on one side of the intervertebral fusion cage 3 near the plastic outer push rod 1. A limiting portion 12 is provided at the end of the plastic outer push rod 1 near the intervertebral fusion cage 3. The limiting portion 12 is configured to be inserted into the limiting groove 31. Insertion of the limiting portion 12 into the limiting groove 31 prevents the intervertebral fusion cage 3 from rotating along with the metal inner push rod 2.

[0031] After the intervertebral fusion cage 3 enters the corresponding intervertebral disc position, in order to prevent it from sliding relative to the intervertebral disc, the surface of the intervertebral fusion cage 3 is provided with multiple anti-retraction teeth 33 to increase the friction between the intervertebral fusion cage 3 and the intervertebral disc. The intervertebral fusion cage 3 is also provided with a bone graft filling groove 34 for accommodating bone graft material. Figure 6 As shown, the intervertebral fusion cage 3 is selected from one of trapezoidal, straight and kidney-shaped to meet different usage requirements.

[0032] Because existing implantation tools are inconvenient to hold, such as Figure 1 and Figure 2 As shown, the plastic outer push rod 1 is provided with a plurality of annular grooves 13 spaced apart along the axial direction to form a grip portion for holding. The grip portion formed by the plurality of annular grooves 13 is more ergonomically designed and more in line with the doctor's surgical habits, and can avoid slipping during the operation.

[0033] In one embodiment, the outer circumference of the push rod handle is provided with two axially opposed arcuate rotating surfaces 41. The provision of the arcuate rotating surfaces 41 makes the plastic push rod handle 4 easier to operate, improves the reliability of the operation, and avoids the problem of being unable to separate the metal inner push rod 2 and the intervertebral fusion cage 3 due to the outer circumference of the push rod handle being too smooth and difficult to rotate.

[0034] The plastic push rod handle 4 has an axially defined receiving hole 42, which receives and secures the other end of the metal inner push rod 2. Specifically, the plastic push rod handle 4 has a radially defined first fixing hole 43 that communicates with the receiving hole 42, while the other end of the metal inner push rod 2 has a radially defined second fixing hole 22. Fixing pins 44 are inserted into the first and second fixing holes 43, 22 to secure the plastic push rod handle 4 to the metal inner push rod 2.

[0035] In summary, the disposable intervertebral fusion device with a push rod of the present invention regards the intervertebral fusion device 3 and the push rod as a whole, which can be sterilized by gamma irradiation for disposable use, effectively avoiding the risk of cross infection caused by reusable push rods. Compared with the stainless steel materials commonly used in the industry, the plastic outer push rod 1 and the plastic push rod handle 4 have lower costs and weight, making the implantation operation of the intervertebral fusion device 3 simpler and more convenient. The intervertebral fusion device 3 and the plastic outer push rod 1 are provided with a limiting groove 31 and a limiting portion 12 to prevent the two from sliding. In addition, the plastic outer push rod 1 is provided with a plurality of annular grooves 13 at intervals to form a gripping portion for holding, which improves the gripping property of the plastic outer push rod 1.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A disposable intervertebral fusion device with a push rod, characterized in that: include: A plastic outer push rod is provided with a through hole along the axial direction; A metal inner push rod is inserted into the through hole and has two ends extending out of the plastic outer push rod; an intervertebral fusion cage, threadedly connected to one end of the metal inner push rod; and The plastic push rod handle is connected to the other end of the metal inner push rod. The plastic push rod handle can be operated to rotate and drive the metal inner push rod to rotate, thereby disengaging the intervertebral fusion cage from the metal inner push rod.

2. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: A limiting groove is provided on one side of the intervertebral fusion cage close to the plastic outer push rod, and a limiting portion is provided on the end of the plastic outer push rod close to the intervertebral fusion cage. The limiting portion is configured to be inserted into the limiting groove.

3. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: A threaded hole is provided on one side of the intervertebral fusion device close to the plastic outer push rod, and a threaded column is provided on one end of the metal inner push rod. The threaded column is configured to be screwed into the threaded hole.

4. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: A plurality of anti-recession teeth are provided on the surface of the intervertebral fusion cage.

5. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: The intervertebral fusion cage is provided with a bone graft filling groove for accommodating bone graft material.

6. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: The intervertebral fusion cage is selected from one of trapezoidal, straight or kidney-shaped.

7. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: The plastic outer push rod is provided with a plurality of annular grooves spaced apart along the axial direction to form a holding portion for holding.

8. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: The outer peripheral surface of the push rod rotating handle is provided with two arc-shaped rotating surfaces opposite to each other along the axial direction.

9. The disposable intervertebral fusion device with push rod according to claim 1, characterized in that: The plastic push rod handle is provided with an accommodating hole along its axial direction and is configured to accommodate and fix the other end of the metal inner push rod.

10. The disposable intervertebral fusion device with push rod according to claim 9, characterized in that: The plastic push rod handle is radially provided with a first fixing hole connected to the accommodating hole, and the other end of the metal inner push rod is radially provided with a second fixing hole. Fixing pins are inserted into the first fixing hole and the second fixing hole to fix the plastic push rod handle to the metal inner push rod.

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