Four-point bending load tester suitable for biological sample of micro CT

Abstract

The invention discloses a four-point bending load tester suitable for a biological sample of micro CT, and aims to provide a four-point bending loading device which aims at the biological sample and meets the use requirements of the micro CT. The four-point bending loading device comprises a loading cavity outer cylinder, a bottom cover, a micrometer head, a shaft coupling, a sensor base, a sensor, a spacing block, a movable pressure head and a fixed pressure head. The outer cylinder is connected with the bottom cover to form a loading cavity, and the micrometer head passes through the bottom cover and is connected with the sensor base through the shaft coupling. One end of the sensor is fixed on the base, while the other end is connected with the spacing block. The spacing block applies load to the movable pressure head through an arc-shaped bulge. The spacing block, the movable pressure head and the fixed pressure head are coupled with one another to determine loading positions. The four-point bending loading device overcomes the defects of oversize and artifacts of materials in the prior art, and successfully provides a controllable four-point bending load for the biological sample inside the micro CT without generating the artifacts, so that correlative research works can be carried out.

Description

technical field [0001] The invention relates to the field of biomechanics, in particular to a four-point bending loading tester for biological samples suitable for microCT. Background technique [0002] Biomechanics is an interdisciplinary subject formed by the combination and mutual penetration of mechanics and biology, physiology, medicine and other disciplines. It is the mechanics to explain life and its activities. As one of the leading disciplines of biomedical engineering, biomechanics plays an important role in promoting the development of biomedical engineering disciplines and industries. The progress of biomechanical research provides a solid foundation for people to further study the pathogenic mechanism and treatment methods of diseases. [0003] Bending loading experiment is an important means to carry out biomechanical research. Through bending experiments, a series of parameters such as elastic modulus of biological samples can be measured, which can reflect ...

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Problems solved by technology

[0008] Therefore, although the bending loading test has been widely used to measure the mechanical properties of biological samples such as bone tissue and has become an important means of evaluating the biomechanical properties of samples, the bending loading device is more complicated than simple tension-compression or torsion devices. , the existing technical means only stop at the destructive loading of the sample and use microCT to analyze its damage state, and it is still impossible to truly and effectively combine the bending loading experiment with the microCT measurement technology, so as to use the non-destructive characteristics of microCT technology to carry out more meticulous research.

[0009] There are two problems in the existing bending loading equipment for bending measurement using microCT: 1. The size of the instrument is too large, beyond the allowable range of microCT, so that researchers can only load the sample on the mechanical testing machine first, and then The sample is transferred to microCT for scanning, resulting in large errors in the process of sample transfer and load retention; 2. The existing equipment is all made of metal, which will produce serious artifacts when scanning in microCT, which will affect the research Work

Therefore, the existing bending test instruments cannot meet people's requirements, and there is an urgent need for a new bending load tester that can be used for microCT measurements, especially a load that can maintain a definite four-point bending loading state during scanning. tester

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