Liquid-nitrogen freezing die and soft biological tissue mechanical test device

Abstract

The invention relates to the field of biological sample mechanical test equipment, and provides a liquid-nitrogen freezing die and a soft biological tissue mechanical test device. The liquid-nitrogenfreezing die comprises a first U-shaped block, a second U-shaped block and a fixed sealing assembly, wherein the first U-shaped block and the second U-shaped block are respectively used for accommodating two ends of a biological sample; the first U-shaped block and the second U-shaped block are arranged in a spacing manner; the fixed sealing assembly comprises a bottom sealing block and a top sealing block; the bottom sealing block and the top sealing block are connected with the first U-shaped block and the second U-shaped block at the same time and surround the four circumferential surfacesof the biological sample. The liquid-nitrogen freezing die can effectively fix the two end parts of the biological sample so as to avoid injury to a biological tissue; meanwhile, the temperature of the middle part of the tissue is equal to that of the peripheral environment, so that the tested sample can be in a natural state to the maximum extent. The soft biological tissue mechanical test devicecomprising the liquid-nitrogen freezing die can effectively clamp and fix the biological tissue and measure the mechanical characteristics of the biological tissue.

Description

technical field [0001] The invention relates to the field of mechanical testing equipment for biological samples, in particular to a liquid nitrogen freezing mold and a soft biological tissue mechanical testing device. Background technique [0002] Mechanical testing studies on biological samples under stress can obtain qualitative information on how different tissues and structures deform or rupture, and these results will help to understand the mechanical properties of complex biological samples. The mechanical performance parameters of soft biological tissues such as muscles, blood vessels, nerves, tendons, and ligaments are often obtained through tensile tests. [0003] In traditional mechanical testing, when fixing soft biological samples, the mechanical clamp method is often used to directly fix biological samples. Practice has proved that when the clamping force is too small, the tissue is prone to slipping; when the clamping force is too large, the local tissue is d...

AI Technical Summary

Problems solved by technology

Practice has proved that when the clamping force is too small, the tissue is prone to slipping; when the clamping force is too large, the local tissue is damaged due to stress concentration, resulting in deformation, advanced damage or fracture of the clamped local tissue; when the tensile stress is applied to the tissue, The core part and peripheral part of the tissue in the clamping area form a complex shear force, and it is impossible to accurately measure the change in mechanical properties of the tested sample due to simple experimental processing factors

The above-mentioned clamping and fixing methods have seriously affected the accuracy of the mechanical test results of biological samples. How to effectively fix soft biological tissues to facilitate the accurate measurement of their mechanical properties is urgently needed for a reliable fixed test device.

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