Cartridge bottle piston sliding property test device and method

Abstract

The present invention relates to a cartridge bottle piston sliding property test device and a test method. The device comprises a cartridge bottle, an adjusting bottle, a fixing fixture, a gas pressure sensor, gas supply equipment and a test machine. The test method comprises the following steps: installing the adjusting bottle and the cartridge bottle on the fixing fixture, and installing a testpiston into the cartridge bottle from the end of the cartridge bottle; starting a pressing rod, and controlling the pressing rod to stop when the lower end of the pressing rod contacts the piston; injecting a certain amount of gas into the adjusting bottle via the gas supply equipment to allow the piston in the cartridge bottle to press on a pressure sensor at the lower end of the pressing rod under the action of the injected gas, and closing the gas supply equipment; starting the pressing rod again to allow the piston to move with a constant speed in the cartridge bottle under the action of pressing rod, drawing the curve of the difference varied with time, wherein a result is obtained by multiplying the gas pressure value measured by the gas pressure sensor by the piston area, and the difference is obtained by subtracting the result from the pressure value measured by the pressure sensor; and obtaining the curve of the friction force on the piston when the piston moves with the constant speed in the cartridge bottle. The obtained data is accurate and intuitive without the need of disposing waste water.

Description

technical field [0001] The invention relates to the technical field of medical product detection, in particular to a device and method for testing the slideability of a cartridge piston. Background technique [0002] The piston and protective cap for cartridges are the key components of the Class I drug packaging material prefilled syringes stipulated by the State Food and Drug Administration. They have the characteristics of difficult control of the molding process. It is difficult to achieve stable mass production due to quality problems such as unqualified performance. At present, the method of testing the slipperiness of the cartridge piston is the water injection test. Although the water injection test can simulate the situation in use, the waste water needs to be treated after the water injection test, which brings a lot of trouble to the test. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a cartridge pi...

AI Technical Summary

Problems solved by technology

[0002] The piston and protective cap for cartridges are the key components of the Class I drug packaging material prefilled syringes stipulated by the State Food and Drug Administration. They have the characteristics of difficult control of the molding process. Unqualified and other quality problems, it is difficult to achieve stable mass production

At present, the test method for the slideability of the cartridge piston is the water injection test. Although the water injection test can simulate the situation during use, the waste water needs to be treated after the water injection test, which brings a lot of trouble to the test.

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