Yes, rackets and strings can help prevent or ease elbow pain. But, if you have an inflamed and hurting elbow, you need to rest it for about 30 days.
Volkl rackets in general are excellent for comfort and reducing vibrations. Pro Kinnex too.
Soft strings and lower tensions like gut or multis in the 50-55 lb range can help too. Poly should be strung low 40-52 lbs for comfort. You can still bet plenty of control and tension from poly at these tensions