A new reusable device created by the Johns Hopkins University can help women with breast cancer in lower income countries by using carbon dioxide, a widely available and affordable gas, to power a cancer tissue-freezing probe instead of industry-standard argon.
source https://www.lifetechnology.com/blogs/life-technology-news-blog/cancer-tissue-freezing-approach-may-help-more-breast-cancer-patients-in-lower-income-countries