Four Medical Devices stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

This week, Winner Medical Group (NASDAQ:WWIN) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Winner Medical Group engages in the research, development, manufacture, and marketing of cotton-base medical dressings and medical disposables. For more information, get Portfolio Grader’s complete analysis of WWIN stock.

Analogic (NASDAQ:ALOG) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Analogic is a technology company that designs and manufactures medical imaging and security systems and subsystems that are used primarily in the healthcare and airport security markets. For more information, get Portfolio Grader’s complete analysis of ALOG stock.

Quidel Corp. (NASDAQ:QDEL) shows solid improvement this week. The company’s rating rises from a C to a B. Quidel discovers, develops, manufactures, and markets rapid diagnostic products for point-of-care detection of human medical conditions and illnesses. Shares of QDEL have increased 11.4% over the past month, better than the 4.3% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of QDEL stock.

Neogen Corp. (NASDAQ:NEOG) is seeing ratings go up from a B last week to a A this week. Neogen develops and markets products and services dedicated to food and animal safety. For more information, get Portfolio Grader’s complete analysis of NEOG 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.