ניתוח לאחר המוות לצורך מחקר

I am making an inquiry regarding one of my congregants, whose wife is suffering from acute Alzheimer’s disease.

He has been approached by a local hospital, asking him to grant permission to use his wife’s organs for medical research in the event of her death.

I fully realize that the dismemberment of the body is forbidden by halakha, but I seem to remember that some authorities permit organ donations if they are used exclusively for medical research and the remains are buried in accordance with Jewish law.

Please inform me of your opinion on this matter, and let me have a speedy reply as the matter is urgent.