By Mike Cherney 

Medical-device maker Medtronic Inc. on Monday launched the largest corporate-bond sale of the year, offering to sell $17 billion to finance its acquisition of Ireland's Covidien PLC.

The deal beats out Apple Inc.'s $12 billion sale in April, making it the largest bond sale by any company in the world this year, according to data provider Dealogic. French cable operator Numericable Group sold $10.9 billion, of bonds, also in April, and Oracle Corp. sold $10 billion in June.

The largest corporate-bond sale on record came in September 2013, when Verizon Communications Inc. sold $49 billion.

Demand for the Medtronic bonds were brisk, with investors placing more than $45 billion in orders for the bonds, according to a person following the sale. As a result, yields were lowered throughout the day. A 10-year bond was initially offered to yield roughly 1.55 percentage points more than benchmark Treasurys, but is now being offered to yield 1.40 percentage points more.

In recent trade, the 10-year Treasury note was yielding 2.217% after hitting a five-week low of 2.15% earlier in the trading session. Bond yields have remained surprisingly low this year due to weak growth, particularly in Europe and China, accompanied by low inflation.

The strong demand for the sale illustrates how bond buyers are still willing to bet on highly rated corporate debt, which offers more yield than low-rate Treasurys, even amid concerns about global economic growth. Medtronic's bonds were provisionally rated A3 by Moody's Investors Service, well within investment-grade territory.

The Medtronic deal will add to the deluge of U.S. corporate-bond sales in 2014, with issuance on pace to best last year's record high.

Medtronic, based in Minneapolis, has said it plans to redomicile in Ireland once the merger is completed, an inversion deal aimed at taking advantage of lower corporate-tax rates overseas. The company previously indicated it was looking at taking on $16 billion in debt to help pay for its $43 billion takeover of Covidien.

Medtronic initially planned to partially pay for the deal with $13.5 billion in cash held by its foreign subsidiaries, but decided instead to tap credit markets after a tax-rule change from the Obama administration.

The A3 rating from Moody's is one notch below where the company was previously rated. Moody's said the A3 rating "will reflect its large scale and diversification, tempered by a strong commitment to shareholders and relatively high gross debt levels."

An outstanding 2024 bond from Medtronic recently traded to yield 1.09 percentage points more than comparable Treasurys, for a yield of 3.409%, according to MarketAxess.

Write to Mike Cherney at mike.cherney@wsj.com

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