What's of a way to thin blood other than aspirin or coumadin (warfarin)?

Several others: There are two new anticoagulants on the market for prevention of stroke in the setting of atrial fibrillation, trade-named Pradaxa and xarelto. There are other antiplatelet drugs used in coronary artery disease, plavix, (clopidogrel) effient, and brillinta.

Injections: Besides the drugs that dr. Kaplan mentioned, there are also injections like heparin, the low molecular weight heparins, such as enoxaparin (lovenox), and fondaparinux (arixtra).