surgical options available
Welcome to XXXXXXX Thanks for your query.
) acts as an anticoagulant
, antiplatelet and fibrinolytic(Thrombolytic). This may to prevent further clot formation and dissolves the clot.
The doctors may have decided not to catheterize because the clot is small and it will dissolve with medicine. The age of your husband is also less and there is an high chance of new vessel formation(Collateral circulation) and maintain a normal blood of the limbs
Now coming to your question.
If recanalization is not done due to various reasons then a filter can be fixed in the large vessels(vena cavas) in the abdomen to prevent clot that break loss getting lodged in the lungs.
Hope the answer helps you.
let me know if there is any clarifications.