This week, the ratings of 7 Health Care Equipment & Supplies stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Entellus Medical, Inc.’s (ENTL) rating weakens this week, dropping to a D versus last week’s C. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of ENTL stock.

InVivo Therapeutics Corporation (NVIV) slips from a C to a D this week. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of NVIV stock.

This week, Accuray Incorporated (ARAY) drops from a C to a D rating. Accuray Incorporated designs, develops, and sells medical radiation systems for the treatment of tumors anywhere in the body. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of ARAY stock.

Cesca Therapeutics Inc. (KOOL) gets weaker ratings this week as last week’s D drops to a F. Cesca Therapeutics Inc. designs, manufactures and markets automated and semi-automated devices and single-use processing disposables that enable hospitals and blood banks to manufacture a therapeutic dose of stem cells. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of KOOL stock.

Great Basin Scientific, Inc. (GBSN) declines this week from a D to a F. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of GBSN stock.

OncoSec Medical Incorporated (ONCS) is having a tough week. The company’s rating falls from a D to a F. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of ONCS stock.

Slipping from a C to a D rating, Amedica Corp. (AMDA) takes a hit this week. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of AMDA 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.