The ratings of 4 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”).

RTI Surgical, Inc. (RTIX) experiences a ratings drop this week, going from last week’s C to a D. RTI Surgical, Inc. produces orthopedic and other surgical implants that repair and promote the natural healing of human bone and other human tissues. For more information, get Portfolio Grader’s complete analysis of RTIX stock.

This is a rough week for Dehaier Medical Systems Ltd. (DHRM). The company’s rating falls to F from the previous week’s D. Dehaier Medical Systems Ltd. engages in the development and distribution of medical devices and related products in the People’’s Republic of China. The company also gets F’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of DHRM stock.

Slipping from a D to a F rating, Cogentix Medical Inc (CGNT) takes a hit this week. 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 CGNT stock.

This week, Escalon Medical Corp.’s (ESMC) rating worsens to a D from the company’s C rating a week ago. Escalon Medical Corp. develops, markets, and distributes ophthalmic medical devices, as well as pharmaceutical and vascular access products. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of ESMC 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.