Medical integrated magnesium alloy biodegradability gas-collection measurement device

Abstract

The invention discloses a medical integrated magnesium alloy biodegradability gas-collection measurement device, which comprises a gas measuring tube, a gas guide hood, a plug valve and a flow guide tube, wherein the tube wall of the gas measuring tube is provided with containing marks and lengths marks, and the tube wall of the marked areas is transparent; the gas guide hood is a hollow cone of which two ends are open; and one end of the gas measuring tube is connected with the flow guide tube by the plug valve, while the other end is connected with the small open end of the gas guide hood. The device has the advantages of compact structure, measurement accuracy, convenience of use, high universality and the like, can easily realize the real-time collection and synchronous accurate measurement of insoluble gases produced in a specific area in a liquid medium so as to meet requirements on the fast and accurate measurement of the corrosion degradability of materials, and is particularly applied to the hydrogen-evolution measurement of the biodegradability of degradable biomedical metal materials / devices, such as magnesium alloys and medical device products thereof.

Description

technical field [0001] The invention belongs to the technical field of material / device performance testing, and relates to a device for real-time collection and synchronous precise quantification of insoluble gas generated in a specific area in a liquid medium by the principle of liquid discharge and gas collection. Background technique [0002] The principle of liquid drainage and gas collection has been widely used in scientific research and experimental teaching. Among them, the hydrogen evolution measurement method used for the evaluation of corrosion protection performance of magnesium alloys, such as biodegradation performance, is a typical case. When magnesium alloys are degraded in water-based media such as seawater and simulated body fluids, the cathodic depolarization reaction is dominated by hydrogen evolution reaction, and the overall reaction equation is as follows: [0003] [0004] If the intermediate steps that may be involved are not considered, the abov...

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Problems solved by technology

[0010] 1) In order to ensure that the funnel and burette can be filled with solution and the gas collected through the funnel can finally enter the burette for measurement, the small end of the funnel must be located in the burette and the mouth of the burette must be below the liquid level, resulting in Funnel position is difficult to control due to inconvenient clamping

Unless relying on a special support device, the funnel can only fall to the bottom of the container to form a relatively closed space with the container, resulting in: A. affecting the substance exchange between the inside and outside of the funnel, and ultimately affecting the performance test results of the sample covered by the funnel ; B. Because it is difficult to adjust the pose of the sample in real time to control its effective working area, it is easy to cause the experiment to fail when the sample happens to fall or fall.

[0011] 2) Due to the blockage of the upper space of the sample by the measuring air tube and the funnel, the conventional simple and easy "suspension" sample loading method cannot be used for sample loading, which causes a series of inconveniences and even affects the experimental results

[0012] 3) Due to the limitation of the shape and specification of the funnel and measuring air tube, the gas collection volume and measurement accuracy are limited at the same time

[0013] 4) Since the conventional measuring gas tube has no length scale, it is inconvenient to measure the liquid level difference inside and outside the tube

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