Find the cricothyroid membrane (soft spot on the throat), cut it open in a up/down motion. To find this, find the Adams apple, or larynx. Below this is a second, smaller bump. The valley between the two is the spot to cut.
Avoiding blood vessels and glandular tissue puncture the cricothyroid membrane with a knife (very carefully and never transversely) (or you could use a sharp pencil or ball point pen), to enter the trachea. The depth of the puncture should be just sufficient to gain access to the airway. No more than a half-inch or about 1.25 cm.
To maintain the opening to facilitate breathing, a soda straw or tube was placed in the opening. A ball point pen casing is also a good tube. (Elapsed time - three minutes)
Get the victim to hospital immediately where further treatment can be provided.
Have someone call emergency services whilst abdominal thrusts and backslaps are being administered. Advise them that the airway is not clearing, and an emergency procedure may be necessary.
Reassure the casualty, panicking may make the choking worse.
This is an extremely dangerous procedure, that carries a high risk of death to the casualty.
Trained medical professionals only should attempt this procedure.
Whatever you use for a breathing tube, make sure it is clean! Otherwise, contamination could kill the patient.