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A clamping device and method for testing mechanical properties of biological soft tissue based on vacuum adsorption

A technology of biological soft tissue and test clips, applied in the direction of measuring devices, using stable tension/pressure testing material strength, scientific instruments, etc., can solve the difficulty of predicting and controlling the penetration depth, the local stress concentration at the bond, and the difficulty of accurate calculation and other issues, to achieve the effects of easy production and promotion, reducing stress concentration problems, and low cost

Active Publication Date: 2017-02-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the thickness of the smeared layer of cyanoacrylate glue, its penetration depth in soft tissue is difficult to predict and control, and it is easy to cause local stress concentration at the joint, resulting in experimental errors and difficult to calculate accurately; in addition, the fixture needs to be checked before and after each experiment. Cleaning to remove cyanoacrylate (often using organic solvents) is a tedious, time-consuming and laborious process

Method used

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  • A clamping device and method for testing mechanical properties of biological soft tissue based on vacuum adsorption
  • A clamping device and method for testing mechanical properties of biological soft tissue based on vacuum adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Biological Soft Tissue Static Tensile Test:

[0036] Step 1, chuck installation: use the upper chuck cap 4 to fix the upper chuck porous material sheet 5 (aperture: 0.01-0.8 mm, porosity: 10-60%) to the upper chuck 1 . Turn on the reciprocating motion testing machine and use the displacement control mode. Connect the upper chuck 1 to the upper fixed end of the reciprocating motion testing machine. Use the lower chuck cap 10 to fix the lower chuck porous material sheet 9 on the lower chuck 13, connect the lower chuck 13 to the lower fixed end of the reciprocating motion testing machine, and make the upper chuck cap central hole 6 and the lower chuck The center hole 8 of the cap is aligned.

[0037]Step 2, soft tissue sample installation: 1) For the upper chuck part, connect the upper chuck connecting pipe 2 with the rubber hose 26, close the air shut-off valve 21 and the air release valve 14 in the inner chamber of the lower chuck, open the main shut-off valve 19, and ...

Embodiment 2

[0042] Dynamic tensile test of biological soft tissue:

[0043] Steps one, two, four, and five are the same as the static tensile test.

[0044] Step 3, start the reciprocating motion testing machine, set the sinusoidal displacement curve (the displacement amplitude is set as the value when the sample produces 20-40% deformation, and the frequency is 0.1-10 Hz), so that the lower chuck 13 reciprocates according to the set sinusoidal curve , record the force response curve of the sample.

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Abstract

The invention belongs to the technical field of soft matter and experimental mechanics, and relates to a biological soft tissue mechanical property test clamping device based on vacuum adsorption. The device comprises a vacuum control loop, an air buffer, a test fixture and the like, wherein the test fixture consists of an upper chuck, a lower chuck, upper and lower chuck porous material plates, upper and lower chuck caps and the like; and L-shaped holes are formed in the upper and lower chucks. By utilizing the pressure difference action between the outside atmospheric pressure and the negative pressure of the L-shaped inner cavity of the upper and lower chucks, a biological soft tissue sample is adsorbed to the chucks. According to a reciprocating motion testing machine, static and dynamic loads are applied to the soft tissue sample by virtue of the fixture, and the mechanical property is tested. The device disclosed by the invention has the effects that the biological soft tissue sample is adsorbed to the chucks by utilizing the pressure difference action, and the accuracy of testing the mechanical property parameters of the animal soft tissue sample is improved. According to the controllable pressure, the device is applied to verifying the experimental repeatability and comparing different soft tissue mechanical properties. The device is high in controllability, convenient to operate and easy to produce and popularize.

Description

technical field [0001] The invention belongs to the technical field of soft matter and experimental mechanics, and relates to viscoelastic mechanics of biological soft tissue, in particular to a clamping device for testing mechanical properties of biological soft tissue based on vacuum adsorption. Background technique [0002] The acquisition of the mechanical properties of human soft tissue is of great significance to the research and medical treatment of bruises. In daily life, accidents such as car accidents, bumps, and falls may cause trauma to human tissues and organs, and even endanger life. In order to develop effective protective measures, it is necessary to accurately test the mechanical properties of human soft tissue, determine its constitutive relationship, and provide reference for numerical simulation and experimental verification. In addition, accurate characterization of the mechanical properties of human soft tissues is of great significance for medical diag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/04G01N3/10
Inventor 张伟吴樊冯亮亮马建立马国军吴承伟
Owner DALIAN UNIV OF TECH