This week, the ratings of 5 Health Care Equipment & Supplies stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Slipping from a C to a D rating, Merit Medical Systems, Inc. (MMSI) takes a hit this week. Merit Medical Systems, Inc. is engaged in the development, manufacture, and marketing of disposable medical products that are used primarily in diagnostic and interventional cardiology and radiology procedures. For more information, get Portfolio Grader’s complete analysis of MMSI stock.

This is a rough week for SeaSpine Holdings Corp. (SPNE). The company’s rating falls to F from the previous week’s D. The company also gets F’s in earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SPNE stock.

Oxford Immunotec Global PLC (OXFD) experiences a ratings drop this week, going from last week’s 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 OXFD stock.

Aethlon Medical, Inc. (AEMD) declines this week from a C to a D. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of AEMD stock.

This week, Unilife Corporation (UNIS) drops from a D to a F rating. Unilife Corporation designs and manufactures medical devices. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of UNIS 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.