On Apr 14, Zacks Investment Research downgraded Mazor Robotics Ltd MZOR to a Zacks Rank #5 (Strong Sell).Why the Downgrade?The downgrade primarily reflects lower orders for the Renaissance system in the first quarter of 2016. The company received 5 orders as compared to a record 12 in the fourth quarter of 2015.In the first quarter, Mazor installed 4 systems in the U.S., including one with brain module, which is primarily used to assist Deep Brain Stimulation (DBS) procedures to treat movement disorders. The company has also installed six systems with the brain module in the U.S.The remaining orders came from Mazor’s Australian distribution partner during the quarter. The company ended the quarter with the placement of 113 Renaissance systems globally, including 68 in the U.S.Owing to the disappointing order growth rate, analysts are reasonably apprehensive, as is evident from the downward estimate revisions. Over the last 7 days, the Zacks Consensus Estimate widened from a loss of 17 cents to a loss of 19 cents per share for the first quarter of 2016.Estimates for the second quarter also widened by a penny to 12 cents. Full-year 2016 loss estimate now stands at 55 cents, wider than 53 cents estimated 7 days ago.However, full-year 2017 estimates have narrowed to a loss of 33 cents per share from 46 cents over the period, primarily due to the encouraging long-term outlook for the Renaissance system and its growing adoption rate among academic institutions.Stocks to ConsiderWhile we choose to avoid Mazor Robotics at present, better-ranked stocks include Inogen INGN, Varian Medical VAR and Globus Medical GMED. All the three stocks carry a Zacks Rank #2 (Buy). Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report VARIAN MEDICAL (VAR): Free Stock Analysis Report INOGEN INC (INGN): Free Stock Analysis Report GLOBUS MEDICAL (GMED): Free Stock Analysis Report MAZOR ROBOTICS (MZOR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research