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”).

DENTSPLY SIRONA, Inc. (XRAY) is having a tough week. The company’s rating falls from a C to a D. DENTSPLY SIRONA, Inc. designs and manufactures a range of dental products. For more information, get Portfolio Grader’s complete analysis of XRAY stock.

This is a rough week for ResMed Inc. (RMD). The company’s rating falls to D from the previous week’s C. ResMed Inc. develops, manufactures and distributes medical equipment for treating, diagnosing and managing sleep-disordered breathing and other respiratory disorders. For more information, get Portfolio Grader’s complete analysis of RMD stock.

Hologic, Inc. (HOLX) earns a D this week, moving down from last week’s grade of C. Hologic, Inc. develops, manufactures, and markets x-ray systems. For more information, get Portfolio Grader’s complete analysis of HOLX stock.

Smith & Nephew PLC Sponsored ADR (SNN) declines this week from a D to a F. Smith & Nephew PLC Sponsored ADR develops, manufactures, markets and sells of medical devices in the sectors of orthopaedics, endoscopy and advanced wound management. For more information, get Portfolio Grader’s complete analysis of SNN stock.

Endologix, Inc. (ELGX) slips from a C to a D this week. Endologix, Inc. develops, manufactures, sells, and markets minimally invasive treatments for vascular diseases. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of ELGX stock.

Slipping from a D to a F rating, Ekso Bionics Holdings, Inc. (EKSO) takes a hit this week. 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.

Skyline Medical, Inc. (SKLN) gets weaker ratings this week as last week’s D drops to a F. The company also gets F’s in sales growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SKLN stock.

This week, NeuroMetrix, Inc.’s (NURO) rating worsens to a F from the company’s D rating a week ago. NeuroMetrix, Inc. is a medical device company that designs, develops and sells proprietary products used to diagnose neuropathies. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of NURO 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.