We also have two niche businesses. One is in the surgical positioning category, and one is in the respiratory space. We are a company that is very focused; continue to be focused on improving our margins, our EPS, and growing our cash flow. And over the last several years, we have seen quite an improvement in all three of those categories.
We have revenue sources that are primarily in the area of capital sales, but we also generate revenue in the rental space and also service. And as mentioned here, we have a solid international footprint from which to grow, and recently that was enhanced by our key acquisition of the Volker products business in Germany. Our products are very competitively positioned in our major categories.
In fact, if you look here you can see that our major products are either in the number one or number two position in the categories in which we compete in our major markets. You will notice that our patient support systems, which is our largest business, is number one along with therapy rental, architectural products and respiratory care, and you can see some other product categories in which we compete. We are in the number two position. And again this refers to the major markets because we have a global footprint, and could be all around the world.
We have a diversified business model. If you look both by business segment, business model and geography, even see that in North America acute care, which is primarily in the hospital setting, North America, we have over 60% of our business. That consists of the frames and surfaces as I mentioned, patient lifts, architectural products. It also has our surgical positioning business, and our health information IT.The post acute setting, which accounts for a little over 10% of our business, is made up of three pieces. One is our extended care business, where we compete in long-term care facilities. The second one is our home care business, and then finally our respiratory care business is also captured within this reporting segment. And finally, we have international business, which is for everything outside of North America, and they carry the product lines I just mentioned, which are sold or rented throughout the world.