Method for controlling water-power ratio of bone cement and hardening time

A technology of hardening time and impedance control, applied in the field of bone cement manufacturing, can solve problems such as lack and inconvenience

Inactive Publication Date: 2008-08-20
叶南辉
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Problems solved by technology

[0006] Therefore, as can be seen from the above, the above-mentioned existing calcium sulfate hemihydrate obviously has inconvenience and lack in actual use, and can be improved.

Method used

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  • Method for controlling water-power ratio of bone cement and hardening time
  • Method for controlling water-power ratio of bone cement and hardening time
  • Method for controlling water-power ratio of bone cement and hardening time

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Embodiment Construction

[0018] Please refer to Fig. 1, the present invention provides a method for utilizing impedance to control bone cement-water-powder ratio and hardening time, comprising: providing a powder and grading and batching (S100); providing a reaction tank, placing the powder into the reaction tank, and conduct AC impedance analysis (S101), provide a certain proportion of water-powder ratio for stirring and impedance measurement (S102), and measure the hardening of the sample and record the hardening time (S103). Wherein the powder is calcium sulfate hemihydrate powder, and the calcium sulfate hemihydrate powder is mainly composed of 200 mesh powder. The reaction tank is an acrylic plate, and the reaction tank has a rectangular groove, and copper glue is arranged on both sides of the groove as electrodes. In this step, an AC impedance analysis (S101) is carried out by means of an electrochemical three-electrode method. The parameters of the AC impedance analysis are an applied voltage o...

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Abstract

The invention provides a method of controlling the medical calcium sulfate crystal distemper ratio by utilizing the resistance generated when the calcium sulfate hemihydrate is solidifying, relating to the field of method of controlling the bone cement distemper ratio and the hardening time by utilizing the impedance, characterized in that in the hardening process of calcium sulfate hemihydrate reacting with water to get calcium sulphate dehydrate, steadiness is deviated by minim voltage disturbing system through AC impedance analysis before the response voltage or current is got and transformed into impedance, which can be regarded as the resistance change between the solid (CaSO4.1 / 2H2O; CaSO4.H2O; CaSO4.1 / 2H2O; CaSO4.2H2O) and the liquid (H2O). The calcium sulfate hemihydrate hardening time under different distemper ratios can be determined through the resistance change to control application in the bone cement injection of the calcium sulfate hemihydrate.

Description

technical field [0001] The invention relates to a method for producing bone cement, especially a method for controlling the water-powder ratio and hardening time of the bone cement by using impedance. Background technique [0002] Calcium sulfate hemihydrate was originally obtained by evaporation and dehydration of calcium sulfate dihydrate when heated. Calcium sulfate hemihydrate will produce hygroscopicity when it meets water. Control the degree of crystallization when calcium sulfate hemihydrate is reduced to calcium sulfate dihydrate, so as to obtain stronger products and longer dissolution time. Among them, calcium sulfate hemihydrate can be divided into α and β according to its physical properties. [0003] Calcium sulfate (calcium sulfate) is the so-called gypsum, which can be divided into anhydrous gypsum (CaSO 4 ), hemihydrate gypsum (CaSO 4 .1 / 2H 2 O) and dihydrate gypsum (CaSO 4 .2H 2 O) Three types. The high-hardness gypsum that is often used in medical tre...

Claims

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Application Information

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IPC IPC(8): A61L27/02A61L31/02
Inventor 叶南辉
Owner 叶南辉
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