Frances Cappuccini, 30, died after losing 2.3 litres of blood at Tunbridge Wells Hospital in Kent.
Consultant anaesthetist Dr Errol Cornish said stimulator drugs should have been in every theatre but he had to call for them.
The teacher died after giving birth to her second son on 9 October 2012.
More on this and other Kent stories
At a trial last January, Dr Cornish was cleared of gross negligence manslaughter and Maidstone and Tunbridge Wells NHS Trust was cleared of corporate manslaughter.
The inquest was told last week Mrs Cappuccini, 30, suffered a fatal haemorrhage after a piece of placenta was left behind from the operation.
Giving evidence on Tuesday at Gravesend Old Town Hall, Dr Cornish said the patient was not breathing and needed vital drugs to be brought round.
But it took five minutes for the nerve stimulator to arrive, it failed to work and there was a similar delay for another one, he said.
The inquest also heard another doctor, anaesthetist Dr Nadeem Azeez, removed Mrs Cappuccini's breathing tube at 12:30 BST - an hour after she was taken into the operating theatre following a haemorrhage.
Dr Cornish said in his opinion "from the documents I've seen and the evidence I've heard", the tube was removed too soon.
Asked if Dr Azeez was at a level that required consultant supervision, he said: "Not in every single case, but in this scenario."
The inquest continues.

Police said the 14-year-old reported feeling unwell and required hospital treatment. He was later discharged from hospital and is recovering at home.
The incident happened in Holywood, County Down, on Saturday.
The PSNI said the tablets were "as yet unidentified" but warned of the "potential dangers" they posed.
The 17-year-old, has been charged with possessing a Class A controlled drug with intent to supply; possessing a Class B controlled drug with intent to supply; possession of a Class A controlled drug; possession of a Class B controlled drug and supplying a Class A controlled drug.
He is due to appear at Newtownards Youth Court on 14 February.
Doctors had to wait up to 10 minutes for vital drugs to treat a mother after an emergency Caesarean section, an inquest has heard.
[NEXT_CONCEPT]
A 17-year-old boy has been charged with drugs offences after a 14-year-old boy was treated in hospital after taking half of a 'Darth Vader' tablet.