Knee joint replacement flexion and extension gap and angle remedy adjusting nail

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses a knee joint replacement flexion and extension gap and angle remediation adjusting nail which comprises a main body, a pyramid-shaped nail is arranged at the lower end of the main body, an upper nail is arranged at the upper end of the main body, and a hole is formed in the main body; compared with the prior art, the adjusting nail has the advantages that in the knee joint replacement surgery operation, when osteotomy is too much or the angle is too large or too small, the adjusting nail can be used, then bone cement can be poured into the hole to make up for excessive osteotomy and conduct angle adjustment, and then the knee joint replacement surgery is completed perfectly and accurately; wherein the design of the pyramid-shaped nail with the length of 1cm gives consideration to anchoring depth and minimally invasive property, and the initial stability is enhanced by the pyramid structure; according to the multi-specification upper nail, by replacing different lengths, accurately adjusting the flexion and extension gap and angle and forming the holes in the main body, bone cement permeation is promoted to form an anchoring effect, and the risk of postoperative looseness is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a knee joint replacement flexion-extension gap and angle remedial regulating nail. Background Art

[0002] Knee replacement is an important surgical method for treating end-stage knee diseases (such as osteoarthritis and rheumatoid arthritis). Its core goal is to restore the force line, stability and mobility of the knee joint through precise osteotomy and prosthesis implantation. However, during the operation, problems such as poor prosthesis alignment, joint instability or postoperative pain may occur due to deviation in the amount of osteotomy (too much or insufficient) or error in the osteotomy angle (such as imbalance in the flexion-extension gap).

[0003] In traditional solutions, if the osteotomy is excessive, bone cement is usually used to fill the defect. However, bone cement alone lacks structural support and may loosen or collapse in the long term. If the osteotomy angle is deviated, the surgeon needs to rely on experience to adjust the prosthesis position or perform a secondary osteotomy, which is complex and risky. In addition, existing fixation devices (such as spacers and screws) are mostly of a single design, making it difficult to compensate for bone defects and adjust angles at the same time, and may affect the uniform distribution of bone cement or the effect of bone integration.

[0004] Therefore, there is an urgent need for an intraoperative remedial device that can flexibly adapt to different osteotomy defects, accurately adjust the flexion and extension gap angles, and provide stable mechanical support to improve the success rate of the operation and the long-term stability of the prosthesis. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a knee replacement flexion and extension gap and angle remedial adjustment nail.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is a knee replacement flexion-extension gap and angle remedial adjustment nail, comprising a main body,

[0007] A pyramid-shaped nail is arranged at the lower end of the main body, an upper nail is arranged at the upper end of the main body, and a hole is arranged on the main body.

[0008] As an improvement, the lower end head of the pyramidal nail is pointed, and the length of the pyramidal nail is 1 cm.

[0009] As an improvement, the upper head of the upper nail is arc-shaped.

[0010] As an improvement, the length from the top of the upper nail to the lower end of the main body is 1mm, 2mm, 2mm, and 4mm.

[0011] As an improvement, the position of the pyramidal nail is 180 degrees symmetrical to the position of the upper nail.

[0012] As an improvement, at least two holes are provided on the main body.

[0013] The advantages of the present invention compared with the prior art are:

[0014] During knee replacement surgery, when there is too much bone resection or the angle is too large or too small, this adjustment nail can be used, and then bone cement can be poured into the hole to compensate for the excessive bone resection and adjust the angle, thereby achieving a perfect and accurate completion of the knee replacement surgery; the design of the 1cm long pyramidal nail takes into account both anchoring depth and minimal invasiveness, and the pyramidal structure enhances initial stability; multiple specifications of upper nails can accurately adjust the flexion and extension gap and angle adjustment by changing different lengths, and holes are set on the main body to promote bone cement penetration to form an "anchoring effect" and reduce the risk of postoperative loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of Embodiment 1 of a knee joint replacement flexion-extension gap and angle remedial adjustment nail according to the present invention.

[0016] Figure 2 It is a top-view stereoscopic structural schematic diagram of embodiment 1 of a knee replacement flexion-extension gap and angle remedial adjustment nail of the present invention.

[0017] Figure 3 It is a bottom-view stereoscopic structural schematic diagram of embodiment 1 of a knee replacement flexion-extension gap and angle remedial adjustment nail of the present invention.

[0018] Figure 4 It is a front view of a second embodiment of a knee joint replacement flexion and extension gap and angle remedial adjustment nail according to the present invention.

[0019] Figure 5 It is a front view of Embodiment 3 of a knee joint replacement flexion and extension gap and angle remedial adjustment nail according to the present invention.

[0020] Figure 6 It is a front view of a fourth embodiment of a knee joint replacement flexion-extension gap and angle remedial adjustment nail according to the present invention.

[0021] As shown in the figure:

[0022] 1. Main body, 2. Pyramidal nails, 3. Upper nails, 4. Holes. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Combined with Figure 1-6 , a knee replacement flexion-extension gap and angle remedial adjustment nail, comprising a main body 1, which is a pancake-shaped structure, made of medical titanium alloy or cobalt-chromium-molybdenum alloy, and has both biocompatibility and mechanical strength;

[0025] A pyramidal nail 2 is provided at the lower end of the main body 1, and the lower end head of the pyramidal nail 2 is pointed, which is convenient for piercing into the cancellous bone for anchoring; the pyramidal side provides anti-rotation and anti-pull-out resistance, and the length of the pyramidal nail 2 is 1 cm. The length of the pyramidal nail 2 is preferably 1 cm, and can also be more than 1 cm, or less than 1 cm, and cooperate with the matching tweezers so that the adjustment nail can be placed in the tweezers, which is convenient for surgical operations; the pyramidal nail 2 can be a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, etc.

[0026] An upper nail 3 is provided at the upper end of the main body 1. The upper head of the upper nail 3 is arc-shaped. The length from the top of the upper nail 3 to the lower end of the main body 1 is 1mm, 2mm, 2mm, and 4mm to adapt to different flexion and extension gap requirements;

[0027] The main body 1 is provided with a hole 4 for bone cement injection; at least two holes 4 are provided on the main body 1, and when two holes 4 are provided, the two holes 4 are symmetrical to each other;

[0028] The position of the pyramidal nail 2 is 180 degrees symmetrical to the position of the upper nail 3 to ensure bilateral mechanical balance.

[0029] Figure 1-3 As shown, the length from the top of the upper nail 3 to the lower end of the main body 1 is 1 mm;

[0030] Figure 4 As shown, the length from the top of the upper nail 3 to the lower end of the main body 1 is 2 mm;

[0031] Figure 5 As shown, the length from the top of the upper nail 3 to the lower end of the main body 1 is 3 mm;

[0032] Figure 6 As shown, the length from the top of the upper nail 3 to the lower end of the main body 1 is 4 mm.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0036] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A knee replacement flexion and extension gap and angle adjustment nail, characterized in that: It includes the subject (1), A pyramid-shaped nail (2) is provided at the lower end of the main body (1), an upper nail (3) is provided at the upper end of the main body (1), and a hole (4) is provided on the main body (1).

2. A knee replacement flexion-extension gap and angle remedial adjustment nail according to claim 1, characterized in that: The lower end of the pyramid-shaped nail (2) is pointed, and the length of the pyramid-shaped nail (2) is 1 cm.

3. The knee replacement flexion-extension gap and angle remedial adjustment nail according to claim 1, characterized in that: The upper head of the upper nail (3) is arc-shaped.

4. A knee replacement flexion-extension gap and angle remedial adjustment nail according to claim 3, characterized in that: The lengths from the top of the upper nail (3) to the lower end of the main body (1) are 1 mm, 2 mm, 2 mm, and 4 mm.

5. The knee replacement flexion-extension gap and angle remedial adjustment nail according to claim 3, characterized in that: The position of the pyramid-shaped nail (2) and the position of the upper nail (3) are 180 degrees symmetrical.

6. The knee replacement flexion-extension gap and angle remedial adjustment nail according to claim 3, characterized in that: At least two holes (4) are provided on the main body (1).

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