“Buttons” – into which the tubes are placed – that are permanent and are for your benefit are not considered a chatzitzah and do not invalidate your immersion. If there are parts that can be removed, such as tubes that you replace periodically and can be without for a short time, they should be removed before immersion.
Please feel free to get back to us with any further questions and more specifics if the above description does not answer your question.
Refuah shleimah!