A suspended 7th chord is created by adding a flattened 7th degree to any suspended triad. For example, a C7sus chord contains the notes C, F, G and Bb (1, 4, 5 and b7). Here are some common open 7th suspended chord shapes.
C7sus
Db7sus
D7sus
Eb7sus
E7sus
F7sus
F#7sus
G7sus
Ab7sus
A7sus
Bb7sus
B7sus