Is what happened considered accidental killing that necessitates expiation, given that the patient died while an attempt was being made to insert a laryngeal tube due to lack of oxygen after the first tube was removed?

If the failure to provide oxygen to a patient is considered medical negligence that led to their death, then it is deemed involuntary manslaughter. This necessitates expiation by fasting for two consecutive months, and the 'Aqilah (the paternal relatives) must pay the blood money (Diyya) to the heirs of the deceased, because negligence and dereliction of duty guarantee accountability for any resulting harm.