Santa Maria Mater Salutis was an early 19th (?) century devotional chapel on the on the Vicolo del Corridoio, which is now the Via dei Corridori in the rione Borgo.
The dedication was to the Blessed Virgin Mary, under her title of "Mother of Salvation"
This small chapel seems to have its first reference in a guide to Rome, the Corografia di Roma published by the Tipografica delle Scienze in 1846. It features on an itinerary for the Borgo, but with no details apart from its diminutive size.
There are no other details available online on its history or appearance.