There are three primary types of obsolescence: technical obsolescence (new technology surpasses the existing technology), functional obsolescence (when a technology can no longer be fixed//upgraded due to parts or software compatibility) and planned obsolescence (a business strategy used to increase sales).
Others have mentioned about the lengthy process for obsoleting products. It’s also troublesome for customers if a product is suddenly not on the market anymore.
To lessen the impact of a sudden replacement of a technology due to obsolescence, companies should focus on organizing the life cycle of the equipment before it is in clinical use and even before it is purchased For example: incorporating the working life expectancy and the time frame in which the equipment will be replaced/renewed into the business plan during the budget process.