Dr Peter Wilmshurst, consultant cardiologist at the Royal Shrewsbury Hospital, was sued by a US medical device manufacturer about concerns he raised at a conference.
The action was dropped in April this year when the company went into liquidation.
But Dr Wilmshurst said the threat of legal action and 'dishonesty in medicine' was jeopardising patient care. He will debate the topic at a Secular Medical Forum event at the BMA's annual representative meeting in Cardiff next week.
'Dishonesty in medicine injures patients,' he said. He warned of 'a code of silence within the profession; collusion to conceal misconduct; victimisation of whistleblowers; and use of the repressive English defamation laws to silence those who would speak out'.
Anyone wishing to attend the secular forum meeting can contact Dr Antony Lempert antony@secularmedicalforum org.uk