Our gross margins for the quarter expanded 460 basis points compared to the prior year and our strong balance sheet continues to position us to pursue business development opportunities to potentially accelerate the growth of our business while at the same time repurchasing shares of our common stock.
As I previously mentioned we set an all-time quarterly revenue record of $32.3 million, up 7% year-over-year. The following factors influenced our revenue performance. Total international revenues were up 21% in the first quarter compared to the prior year. Total product segment revenues grew 14% to $16.5 million. Worldwide BioGlue revenues were up 14% for the first quarter. This increase was predominantly driven by volume increases early in Japan due to the recent launch of the products in April 2011. We continue to remain enthusiastic about the opportunity in Japan and have received positive feedback and new orders from our distribution partner.
PerClot sales for the first quarter was $644,000. We continue to experience some headwinds in the EU due to austerity programs and competition but we continue to expect growth in PerClot revenues in international markets over the coming years. This will be driven by geographic expansion in new international markets as we broaden our EU sales focus beyond cardiac and vascular surgery.
We have received positive feedback on the usage of PerClot in the EU for neurosurgery and prostate surgery and believe these are growth opportunities for us. Additionally, we are working towards the potential USPMA approval which we continue to expect no later than 2014. Steve will provide additional details on the PerClot timeline in his remarks.Residents from the Cardiogenesis product line were $2.1 million for the first quarter. We continue to press forward with our TMR training programs and believe that we’ll see low double-digit growth for this business as we train additional surgeons.
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