Soft matrix coating adhesion performance testing device and characterization method

Abstract

The invention discloses a soft matrix coating adhesion performance testing device and a characterization method. The soft substrate coating adhesion performance testing device comprises a container, an air bag bracket and an inflatable and deflatable air bag arranged in the air bag bracket, the periphery of the air bag support is closed, and the top and the bottom of the air bag support are respectively provided with an installation hole for a to-be-tested tubular base body to penetrate through. The inflatable and deflatable air bag expands and deforms inwards from the peripheral side of the air bag bracket so as to surround and extrude the peripheral side surface of the tubular base body to be detected; the container is internally provided with a liquid medium which can be filled between the inflatable and deflatable air bag and the tubular base body to be detected. The device can truly simulate the actual application scene of the tubular base body to be tested, and the authenticity and reliability of the test are improved. According to the method for characterizing the adhesion performance of the outer coating of the base body based on the device, the adhesion performance of the outer coating of the base body can be characterized by the adhesion performance characterization parameter Kf, the Kf is not influenced by the device and the size parameter of the tubular base body to be detected, and the method is suitable for evaluating various tubular base bodies to be detected.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of medical devices, in particular to a device for testing the adhesion properties of soft substrate coatings. It also relates to a method for characterizing the adhesion performance of the soft substrate coating, using the aforementioned test device for the adhesion performance of the soft substrate coating. Background technique [0002] Interventional medical consumables such as urinary catheters and venous catheters have a wide range of users. In clinical practice, in order to reduce the adverse medical experience of patients, the method of attaching super slippery coatings to the surface of catheters is generally used to increase their movement in the human body. smoothness. [0003] Based on the above uses of interventional medical consumables, in order to ensure the reliability of the combination of the soft substrate coating and the substrate of interventional medical consum...

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Problems solved by technology

[0004] At present, the following two methods are widely used in the adhesion test of soft substrate coatings: the first method uses the cross-hatch method to characterize the quality of the coating, which needs to directly destroy the soft substrate coating itself, and is not suitable for surface roughness. Flat interventional medical consumables; the second method is to use the reciprocating motion abrasion test to test the adhesion of the coating. During the test, it is necessary to apply positive pressure to the interventional medical consumables and their soft substrate coating through a plate-shaped fixture. Medical consumables are tubular and other non-planar structures, which will undergo large uneven deformation in the radial direction under the action of positive pressure, which cannot simulate the real contact state between interventional medical consumables and the human body, and cannot obtain the true adhesion of the soft substrate coating Happening

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