ASTM F3276-19

5.1.1 The first test method utilizes a force tester to measure the force required to actuate a brush part across a surface. This is an indicator of the friction a brush exerts on a surface, a parameter of cleaning effectiveness.

5.1.2 The second test method measures the removal of soil from a surface by a brush part actuated across the surface. This is a further indicator of the effectiveness of a brush part to loosen and remove soil from a surface.

1.3.1 This guide describes objective, quantifiable, and reproducible methods for evaluating the cleaning characteristics of a brush part, under prescribed laboratory conditions, with a test method that simulates the cleaning challenge of a defined target area(s) of a medical device. This also makes it possible to compare one brush part design to another.

1.3.2 By use of this guide, manufacturers of cleaning brushes will be able to evaluate and characterize the cleaning performance of their brushes for the target area(s) of medical device(s) and evaluate modifications to design and construction that might improve performance.

1.3.3 By use of this guide, this information can also be shared with the users of the brushes (medical device reprocessors) to help them evaluate the performance of commercially available brushes.

1.4.1 This guide does not assess potential damage that may be inflicted by the brush, or degradation of the brush that may occur during repeated use. Brushes with rigid bristles (e.g., stainless steel or other metals) are predicted to be more likely to damage medical devices than brushes with flexible bristles (e.g., nylon); damage from rigid-bristled brushes should be assessed. Assessing repeated use would require a greatly increased number of test repetitions than what is described in this guide.

1.4.2 This guide does not specify acceptance criteria, and the results will be dependent on the specific parameters that are tested (e.g., test soil, drying time, surface area, and materials, etc.) that are tested.

1.4.3 This guide is not intended to constitute all steps required to conduct validation of cleaning instructions for a medical device, including use of brushes for this purpose, but provides methods that may be part of a broader protocol to conduct a complete cleaning instructions validation. Separate medical device cleaning instruction validation studies must be conducted.