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

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

Trinity Biotech Plc Sponsored ADR Class A (TRIB) experiences a ratings drop this week, going from last week’s D to a F. Trinity Biotech Plc Sponsored ADR Class A develops, acquires, manufactures, and markets medical diagnostic products for the clinical laboratory and point-of-care segments of the diagnostic market. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TRIB stock.

This is a rough week for Derma Sciences, Inc. (DSCI). The company’s rating falls to D from the previous week’s C. 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.

CytoSorbents Corporation (CTSO) gets weaker ratings this week as last week’s C drops to a D. The company also gets F’s in earnings surprise and return on equity. For more information, get Portfolio Grader’s complete analysis of CTSO stock.

This week, ViewRay, Inc.’s (VRAY) rating worsens to a F from the company’s B rating a week ago. The company also gets F’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of VRAY stock.

This week, CryoPort, Inc. (CYRX) drops from a C to a D rating. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CYRX stock.

Bellerophon Therapeutics, Inc. (BLPH) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of BLPH stock.

Xtant Medical Holdings, Inc. (XTNT) declines this week from a D to a F. The company also gets F’s in earnings revisions and free cash flow. For more information, get Portfolio Grader’s complete analysis of XTNT 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.