JULIA Drown was one of around 60 Labour MPs who rebelled against the Government's plans for foundation hospitals.
Ms Drown, who represents South Swindon, said the proposals to set up NHS foundation trusts had not been thought through.
Despite the rebels' attempts to scupper the Health and Social Care (Community Health and Standards) Bill, it was last night passed by a majority of 74 votes.
A rebel amendment was lost by 180 votes.
Ms Drown said: "The Government has done much for the health service, and I am confident that this will continue.
"But I will also continue to oppose this Bill until it is properly worked out."
Michael Wills, MP for North Swindon, who is a junior Home Office minister, supported the Government's plans.
Opponents of the scheme argue that the creation of foundation hospitals, which are semi-independent from Whitehall with powers to raise their own funds, would lead to a two-tier health service.
Swindon and Marlborough NHS Trust will not be amongst the first wave of foundation hospitals because it failed to achieve a three-star rating in the hospital league tables which were published last year.
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