The ratings of 8 Health Care Equipment & Supplies stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

LivaNova Plc (LIVN) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of LIVN stock.

This week, Meridian Bioscience, Inc.’s (VIVO) rating worsens to a D from the company’s C rating a week ago. Meridian Bioscience, Inc. manufactures diagnostic test kits, bulk antigens, antibodies and bioresearch reagents used by researchers and other diagnostic manufacturers. For more information, get Portfolio Grader’s complete analysis of VIVO stock.

Invacare Corporation (IVC) gets weaker ratings this week as last week’s D drops to a F. Invacare Corporation manufactures and distributes health care products to the non-acute care market on a worldwide basis. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of IVC stock.

This is a rough week for Aethlon Medical, Inc. (AEMD). The company’s rating falls to D from the previous week’s C. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of AEMD stock.

Slipping from a C to a D rating, Derma Sciences, Inc. (DSCI) takes a hit this week. Derma Sciences, Inc. markets and sells a range of skin care, wound management, and specialty securement devices. For more information, get Portfolio Grader’s complete analysis of DSCI stock.

Ekso Bionics Holdings, Inc. (EKSO) earns a F this week, moving down from last week’s grade of D. The company also gets F’s in sales growth, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of EKSO stock.

This week, DarioHealth Corp. (DRIO) drops from a C to a D rating. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of DRIO stock.

Corindus Vascular Robotics, Inc. (CVRS) slips from a D to a F this week. The company also gets F’s in sales growth, earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CVRS 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.