This page contains information that may not be medical advice and is not a substitute for medical care. Always seek the advice of your doctor or other qualified health care provider with any questions you may have regarding a medical condition. A variety of products have been tested on varicose veins. All of the products have failed at some point or another. Here is a summary of the varicose veins products that have been tested and show no signs of work. These are products that are marketed for varicose veins. These products are not the same as those marketed by ATC, Inc.. Narrow Mouth Dental Clamp NMDC and ATC advertise this product as a diaphragm clamp for varicose veins. This is not a diaphragm clamp; it is an actual medical device designed for a varicose vein. It is an actual piece of medical equipment. The patent expired in 2010. It should be noted that it is sold in the United States by the National Medical Device Association and that the product is no longer being produced. Migraine Clamp The Migraine Clamp is a device designed to help stop the flow of blood from a migraine headache. The device contains a flexible rubber band that is held in place by a small metal spring.