This week, the ratings of three medical devices stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Derma Sciences, Inc. (DSCI) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Derma Sciences markets and sells a range of skin care, wound management, and specialty securement devices. In Portfolio Grader’s specific subcategories of Equity, Cash Flow and Sales Growth, DSCI also gets an F. For more information, get Portfolio Grader’s complete analysis of DSCI stock.

St. Jude Medical, Inc. (STJ) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. St. Jude Medical makes and distributes cardiovascular medical devices. To get an in-depth look at STJ, get Portfolio Grader’s complete analysis of STJ stock.

Slipping from a C to a D rating, Baxter International (BAX) takes a hit this week. Baxter International develops, manufactures and markets products related to hemophilia, immune disorders, infectious diseases, kidney disease, trauma, and other chronic and acute medical conditions. The stock also rates an F in Earnings Revisions. For more information, get Portfolio Grader’s complete analysis of BAX stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.