Brenda Infante loads cartridges into a back-end automation system at the Tandem Diabetes Care manufacturing plant in San Diego. File photo by Jamie Scott Lytle

Brenda Infante loads cartridges into a back-end automation system at the Tandem Diabetes Care manufacturing plant in San Diego. File photo by Jamie Scott Lytle

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Khris Contemprato, an operator of Dexcom’s transmitter manufacturing line in San Diego, presses the start cycle on the computer numerical control mill to give the transmitter its final shape. Dexcom’s technology includes a sensor — typically on a patient’s abdomen — that measures just below the skin, and a transmitter relays glucose level data every five minutes to a smart device. File Photo by Melissa Jacobs

Revenue Growth, Per Recent Quarterly Results

Dexcom: $242.5 million, 42 percent year-over-year increase

Tandem Diabetes Care: $34.1 million, 60 percent year-over-year increase

ResMed: $623.6 million, 12 percent year-over-year increase

NuVasive: $281.6 million,

8.5 percent year-over-year increase

— Four major medical device companies based in San Diego recently delivered strong quarterly results, lifting their stocks and growth outlooks...

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