In closed-cell stents, every stent segment is connected by a link, making them less flexible but with better radial force. In open-cell stents, some stent segment connections are absent, giving the stent greater flexibility/ability to conform to tortuous vessels but less radial force. The drug-eluting stent is coated not with an anticoagulant but rather with an agent that inhibits cell proliferation. What are the two types of stents based on their cell structure?
1) Closed-cell stents and open-cell stents
2) Flexible stents and rigid stents
3) Radial force stents and tortuous vessel stents
4) Anticoagulant stents and cell proliferation stents