The ratings of 10 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”).

This is a rough week for St. Jude Medical, Inc. (STJ). The company’s rating falls to D from the previous week’s C. St. Jude Medical, Inc. makes and distributes cardiovascular medical devices. For more information, get Portfolio Grader’s complete analysis of STJ stock.

SurModics, Inc. (SRDX) is having a tough week. The company’s rating falls from a C to a D. SurModics, Inc. offers drug delivery and surface modification technologies to the healthcare industry. For more information, get Portfolio Grader’s complete analysis of SRDX stock.

K2M Group Holdings, Inc. (KTWO) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of KTWO stock.

Invacare Corporation (IVC) earns a D this week, moving down from last week’s grade of C. 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 and earnings surprise. For more information, get Portfolio Grader’s complete analysis of IVC stock.

Oxford Immunotec Global PLC’s (OXFD) rating weakens this week, dropping to a D versus last week’s C. The company also gets F’s in earnings surprise and return on equity. For more information, get Portfolio Grader’s complete analysis of OXFD stock.

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

Second Sight Medical Products, Inc. (EYES) slips from a C to a D 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 EYES stock.

InVivo Therapeutics Holdings Corporation (NVIV) declines this week from a C to a D. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of NVIV stock.

This week, Capnia Inc (CAPN) drops from a D to a F rating. The company also gets F’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of CAPN stock.

This week, Skyline Medical, Inc.’s (SKLN) rating worsens to a D from the company’s C rating a week ago. 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.

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.