A nickel-titanium shape memory alloy umbrella-shaped hammer lock retainer

Abstract

This utility model relates to the field of medical auxiliary device technology and discloses a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator, including a bone plate. A pointed tip is fixedly connected to the outer right side of the bone plate. Lateral pressure barbs are fixedly connected to both the front and rear ends of the outer right side of the bone plate. Vertical pressure barbs are fixedly connected to both the upper and lower ends of the outer right side of the bone plate. A middle pressure beam is fixedly connected to the outer left side of the bone plate, and a pressure tail tooth is fixedly connected to the outer left side of the middle pressure beam. In this utility model, the bone plate serves as the foundation for connecting and supporting the fracture site; the pointed tip helps to accurately place the fixator in the appropriate position; the lateral and vertical pressure barbs apply pressure to the fracture site from both lateral and vertical directions, respectively, enhancing the fixation effect; the middle pressure beam further stabilizes the middle part of the fracture site; and the pressure tail tooth provides additional pressure.

Description

Technical Field

[0001] This utility model relates to the field of medical auxiliary device technology, and in particular to a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator. Background Technology

[0002] In fracture surgery, a common procedure is to use metal plates to fix the fracture site. Screws are then used to secure the plate to the fracture, immobilizing the fracture. However, for elderly patients, who often have varying degrees of osteoporosis, fixing a fracture is more difficult than for younger individuals. Screws inserted into porous bone have very low pull-out force, making effective fixation challenging.

[0003] Currently available rigid screws offer good initial compression, but they cannot maintain compression throughout the dynamic healing process. The combination of plate and screw fixation is relatively rigid, which can lead to soft tissue irritation. Screws may fail when driven into osteoporotic bones.

[0004] However, in practical applications, for osteoporotic areas, the usual methods are to add screws or inject bone cement into the screw implantation site. However, increasing the number of screws not only causes greater trauma to the bone, but also increases the stress shielding effect, which can lead to loosening of the bone plate later. Using bone cement for reinforcement fixation carries the risks of bone cement leakage, heat generation during bone cement solidification, and embolism caused by pressure on the bone cement. To address the above issues, a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator, which aims to improve the problem that the existing technology cannot provide more effective fixation support for fracture sites in some osteoporosis patients.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator includes a bone plate. A pointed tip is fixedly connected to the outer right side of the bone plate. Transverse pressure barbs are fixedly connected to both the front and rear ends of the outer right side of the bone plate. Vertical pressure barbs are fixedly connected to both the upper and lower ends of the outer right side of the bone plate. A middle pressure beam is fixedly connected to the outer left side of the bone plate. Pressure tail teeth are fixedly connected to the outer left side of the middle pressure beam.

[0008] This utility model has the following beneficial effects:

[0009] In this invention, the bone plate serves as the foundation for connecting and supporting the fracture site; the pointed tip helps to accurately place the fixator in the appropriate position; the lateral and vertical pressure barbs apply pressure to the fracture site from the lateral and vertical directions respectively, enhancing the fixation effect; the middle pressure beam further stabilizes the middle part of the fracture site; and the pressure tail tooth provides additional pressure, ensuring that the entire fixator provides continuous and stable fixation to the fracture site. This fixator can continuously apply pressure to the fracture site in an umbrella-like shape, making it very suitable for patients with various bone fractures, especially for patients with osteoporosis, providing more effective fixation support for these patients. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixer proposed in this utility model;

[0011] Figure 2 This is a schematic diagram of the middle section pressure beam of a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixer proposed in this utility model.

[0012] Legend:

[0013] 1. Bone plate; 2. Pointed tip; 3. Lateral pressure barb; 4. Vertical pressure barb; 5. Mid-section pressure beam; 6. Pressure tail tooth. Detailed Implementation

[0014] 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.

[0015] Reference Figures 1 to 2 This utility model provides an embodiment of a nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator, including a bone plate 1. The bone plate 1 is the main component of the entire fixator and is made of a nickel-titanium shape memory alloy with unique shape memory function. This alloy has excellent biocompatibility, which can reduce the body's rejection reaction to it. At the same time, it can recover to a preset shape under different temperature environments. This characteristic is crucial for the bone plate to adapt to complex fracture sites and healing processes. A pointed tip 2 is fixedly connected to the outer right side of the bone plate 1. The pointed tip 2 is also made of nickel-titanium shape memory alloy and is sharp and strong. Its main function is to facilitate the doctor to accurately insert the bone plate 1 into the appropriate position during surgery. The pointed tip can easily penetrate the surrounding soft tissue and accurately reach the target bone site, laying the foundation for the subsequent fixation operation of the bone plate 1.

[0016] The design of the pointed tip 2 takes into account both the convenience of puncture and ensures that it will not cause excessive damage to the bone and surrounding tissues during insertion. The front and rear ends of the outer right side of the bone plate 1 are fixedly connected with transverse pressure barbs 3. The transverse pressure barbs 3 can be embedded into the surface of the bone. Through the barb structure of the transverse pressure barbs 3 themselves, they provide transverse stable support for the bone plate 1 and prevent the bone plate 1 from shifting in the horizontal direction. These barbs can effectively increase the friction and gripping force between the bone plate 1 and the bone, ensuring that the bone plate 1 always stays in the correct position during the fracture healing process, thereby better promoting the healing of the fracture site. The upper and lower ends of the outer right side of the bone plate 1 are fixedly connected with vertical pressure barbs 4. The function of the vertical pressure barbs 4 is to stabilize the bone plate in the vertical direction. They penetrate into the surface of the bone and provide vertical pressure to prevent the bone plate from moving in the vertical direction.

[0017] The transverse pressure barbs 3 and vertical pressure barbs 4 work together to fix the bone plate from multiple directions, forming a stable three-dimensional fixation system. This greatly improves the reliability and stability of the bone plate 1 fixation. A mid-section pressure beam 5 is fixedly connected to the outer left side of the bone plate 1. The main function of the mid-section pressure beam 5 is to provide additional support and pressure on the left side of the bone plate 1. Especially when the fracture site is located in the middle of the bone, the mid-section pressure beam 5 can withstand greater external force, tightly fitting the bone plate 1 to the bone, further enhancing the fixation effect of the bone plate 1 and promoting fracture healing. Pressure tail teeth 6 are fixedly connected to the outer left side of the mid-section pressure beam 5. The function of pressure tail teeth 6 is to provide more precise pressure and fixation on the far left side of the bone plate 1. These small teeth can penetrate into the tiny gaps in the bone, increasing the contact area and friction with the bone, further preventing displacement of the bone plate 1 during fixation.

[0018] When the fixator is placed at the target location (such as the fracture site), the fixator is not fully deployed. As the temperature recovers (for example, the effect of human body temperature, because nickel-titanium shape memory alloys can usually exert shape memory effect well under human body temperature), the umbrella-shaped structure begins to unfold, and the "umbrella ribs" extend outwards and fit against the target surface. This process begins to generate initial pressure.

[0019] During human movement, the umbrella-shaped structure of the fixation device can dynamically adjust according to the direction and amplitude of movement in three-dimensional space. For example, when the fracture site is subjected to complex movements such as bending or twisting, each "umbrella bone" of the umbrella-shaped hammer lock fixation device can change its degree of extension accordingly with the slight displacement of the bone. If the bone tends to separate in a certain direction, the corresponding "umbrella bone" will generate a greater reaction force due to its own elasticity and shape memory effect, thereby achieving continuous three-dimensional dynamic pressure and ensuring the stability of fixation.

[0020] The excellent biocompatibility and mechanical properties of nickel-titanium shape memory alloys allow the fixation device to maintain this dynamic pressure state for extended periods. Unlike some traditional materials, it is not prone to fatigue or loosening, ensuring effective pressure on the target object (such as a fracture site) in three-dimensional space and promoting healing processes.

[0021] Working Principle: In practical application, the fixator is first subjected to low-temperature plastic deformation to facilitate its placement at the fracture site. Subsequently, driven by body temperature, the fixator undergoes a metallographic change, generating memory recovery force. At this point, the various components of the fixator cooperate and coordinate to jointly complete the fixation of the fracture site. Among them, the bone plate 1 plays a basic role in connecting and supporting the fracture site; the pointed tip 2 helps to accurately place the fixator in the appropriate position; the transverse pressure barbs 3 and the vertical pressure barbs 4 apply pressure to the fracture site from the transverse and vertical directions, respectively, enhancing the fixation effect; the middle pressure beam 5 further stabilizes the middle part of the fracture site; the pressure tail tooth 6 provides additional pressure to ensure that the entire fixator provides continuous and stable fixation to the fracture site. This fixator can continuously apply pressure to the fracture site in an umbrella-like shape, making it very suitable for patients with various bone fractures, especially for patients with osteoporosis, providing more effective fixation support for these patients.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A nickel-titanium shape memory alloy umbrella-shaped hammer lock fixator, comprising a bone plate (1), characterized in that: The bone plate (1) is fixedly connected to a pointed tip (2) on the outer right side. The bone plate (1) is fixedly connected to both the front and rear ends of the outer right side with transverse pressure barbs (3). The bone plate (1) is fixedly connected to both the upper and lower ends of the outer right side with vertical pressure barbs (4). The bone plate (1) is fixedly connected to a middle section pressure beam (5) on the outer left side. The middle section pressure beam (5) is fixedly connected to a pressure tail tooth (6) on the outer left side.

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