Patient monitoring technology provider Healthsense has been acquired by GreatCall after raising about $23m in equity from investors including Merck & Co.

Pharmaceutical firm Merck & Co exited US-based remote monitoring services provider Healthsense on Tuesday through an acquisition of undisclosed size by connected health technology producer GreatCall.

Healthsense has developed a system that utilises wireless sensors to oversee the everyday activities of elderly or disabled patients, using data to establish patterns indicating normality and allowing carers to discern any changes that may reflect a negative change in their health.

The company had raised approximately $23m in equity and $6.6m in debt…