In the Mechanical Valve arena, the Standard St. Jude Master's Series Valves hold the record for durability at 30 years and counting. (See
www.sjm.com for more info).
Note that Mechanical Valves require some sort of Anti-Coagulation Medication for Life to prevent Clot Formation. (The downside of Tissue Valves is that they eventually wear out and need to be replaced).
ALL of the Mechanical Valves were designed (at least in part) by Jack Bokros, Ph.D., who was involved in the creation of the Pyrolytic Carbon used in the leaflets of the first Bi-Leaflet St. Jude valves.
He has since founded Carbomedics, holds patents on the Carbomedics and ATS Valves, and most recently founded On-X to market his 'latest and greatest' developments in mechanical valves beginning in 1996. See
www.heartvalvechoice.com and
www.onxvalves.com for the details on how these advancements improve performance.
MY first choice, especially for the Mitral Valve, is the On-X Valve with the St. Jude Master's Series as a backup plan. To my mind, ATS and Carbomedics are spin-offs of the St. Jude Valve so if you are looking for a proven record (vs. new technology), why not go with St. Jude.
In your dad's case, since he is already 65, a good argument can be made for the Bovine Pericardial Tissue Valve if his life expectancy is not expected to be more than another 20 years or so. The Bovine Tissue Valves have a good record of durability approaching 20 years when implanted in patients over 65 for most patients.
The 'new and improved' Bovine tissue valves have an anti-calcification coating that is hoped to extend that durability a few more years. (Carpentier-Edwards is one manufacturer of those valves).
To my mind, ANY of those 3 options would give your father a good extension on life. It becomes a matter of personal preference, often deciding which of the negative aspects of the valve (every valve has some positive and negative attributes) you (he) can best live with.
On-X has the Latest Technology with enhanced performance
St. Jude has the record for durability
C-E Bovine Pericardial Tissue Valve does not require anti-coagulation medication UNLESS the patient also develops Atrial Fibrilation (which can happen even without artificial valves)
Valve choice can get complicated. It helps to understand the trade-offs. The "sticky" posts at the top of the Valve Selection Forum is a good place to begin to learn about the options.
'AL Capshaw'