What is the ruling on using medications containing the compound Heparin extracted from pig intestines and cow lungs, such as Enoxaparin, Tinzaparin, and Clexane, which are used for thrombosis patients, given that some patients refuse them due to the presence of Heparin extracted from pigs?

If a substance extracted from the intestines of a pig or a dead animal is mixed with other substances until it transforms and no trace of it remains, then there is no objection to using it for medicinal purposes. However, if it does not transform and a trace of it remains, then it is not permissible to use it for medicinal purposes except in cases of necessity.