A Second World War veteran bled to death after cutting his arm on a plate glass internal door at his council bungalow.
Widower Sidney Harvey (90), of Charles Close, Bourne, left a trail of blood as he sought help from a neighbour, who wrapped up his arm and dialled 999.
Ambulance personnel battled to stem the flow of blood and used a defibrillator as his heart stopped beating several times, but Mr Harvey died at Peterborough City Hospital that day, November 26.
South Lincolnshire assistant coroner Siobhan Kelly said no one will ever know how the accident happened.
After hearing Mr Harvey’s friends, Roger and Elizabeth Osborn, voice concerns about plate glass being used in two doors at his home, Miss Kelly is writing to South Kesteven District Council.
The inquest heard plate glass doors have not been standard for some time as they can cause the type of injury that Mr Harvey sustained.
Miss Kelly said: “I can’t require anything specific to be done, but I can require them to address their minds to it.”
A post mortem examination revealed Mr Harvey had a severe heart condition and pathologist Dr Dalibor Strathil said it was possible that precipitated his fall into the plate glass door.
Ambulance paramedic Peter Hughes said Mr Harvey’s cut went through to the bone and described the injury as “quite a serious bleed”.
Mrs Osborn said she had been to see Mr Harvey shortly before the accident and wrote a note for him to put in the front window for the electricity people, telling them to come round the back – he had waited in the lounge for them the previous day but they hadn’t turned up.
She said: “After his wife passed away, other than to keep it clean, I don’t think he ever went into the lounge. He used to stay in the kitchen.”
Miss Kelly concluded Mr Harvey’s death was an accident.