A private-equity arm of Citic Group Corp. agreed to buy the rest of Singapore-based medical device maker Biosensors International Group Ltd. for about S$1.1 billion ($817 million). Biosensors shares surged.

Citic Private Equity Funds Management Co., which already controls about 19.6 percent of Biosensors, is paying S$0.84 a share for the stock it doesn’t already own, according to a stock exchange statement today. That price is about 24 percent higher than Biosensors’ last closing price of S$0.68.

Biosensors makes coronary stents as well as other medical devices used during heart surgery and intensive care treatment. The Chinese private-equity firm had bought its stake in Biosensors in November 2013 from Shandong Weigao Group Medical Polymer Co. for $312.3 million, or S$1.05 per share, according to exchange filings.

Citic Private Equity had considered making a bid for Biosensors in 2014, Bloomberg News reported in February last year. Biosensors shares surged as much as 21 percent to S$0.82 before trading at S$0.81 at 9:11 a.m. in Singapore today.

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