He captured the rat alive at Dr Ambedkar General Hospital, claimed corporator Kamlesh Yadav.
Mayor Vishwanath Mahadeshwar, who was presiding over the meeting, asked Yadav and his supporters to leave the house.
Speaking to PTI, Yadav said, "This was the only way to shake and wake up the administration which has utterly failed to control the menace of rat-bites at the hospital."
Instead of getting cured of existing aliment, patients and their relatives are required to seek treatment for rat bites which they suffer at the hospital, he said.
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"Finally, to bring this menace to the notice of senior civic officials, I went to the hospital, trapped a rat and brought it to the BMC headquarters," Yadav said, asking what the rat catchers employed by the civic body were doing.
When contacted for comment, additional municipal commissioner Idzes Kundan said, "Strict measures will be taken to rid hospitals of rats."
He also said that action will be taken against patients' relatives who litter hospital premises with pieces of food items.