Here's a video of a test pilot being deliberately put under by gas.
Uploaded on 21 May 2011
USAF medical test of pilot's breathing if he became unconscious in-flight while wearing a full-pressure helmet. Test uses a general anaesthetic on the subject.
Student research pilot wears a USAF MC-3B full-body rubber bladder pressure suit fitted with pressure boots and gloves.
Helmet is the new MA-5A full pressure helmet used for rocket plane flights to edge of space. Inside the helmet, the pilot's head is totally enclosed in a full head airtight inflatable rubber liner containing the helmet earphones and anti-G bladders. The pressure helmet is sealed to the suit with an inflatable rubber bladder-type neckseal.
The anaesthetic gas enters the helmet through a special valve in the lower part of the facepiece via the thin rubber tube next to the usual corrugated oxygen hose.
00-22 secs suit and helmet are fully pressurised with 100% oxygen at 0.275 bar...helmet pressure increased to 0.315 bar.
0.22- 75% nitrous oxide is fed into the helmet.
0.32-1.20 Pilot becomes aware of the effects of nitrous.. the helmet becomes difficult to hold up...eyes lose focus and become blank as induction started
1.21 The general anaesthetic gas Sevoflurane is added to helmet mix at 2% in 65% nitrous oxide and 35% oxygen. Pilot tries to fight against the effects of the new gas. Interior helmet pressure increases speed of induction.
1.45 Difficulty in holding helmet up as anaesthetic takes effect
2.02 Pilot's eyes roll up as he goes under the gas
2.17-3.07 pilot's pressure helmet falls forward as subject is completely anaesthetised. General anaesthesia maintained inside the helmet
At end of test, the anaesthetic gases are turned off and 100% pure oxygen is fed into the helmet at increased pressure of 0.325 bar.Subject gradually comes out of the anaesthesia and regains consciousness and full awareness realising he's still wearing a pressure helmet
Here's another:-
Uploaded on 21 May 2011
Second anaesthesia test on pressure-suited student pilot. Test two hours after first test after subject has had time to recover.
The anaesthetic gases enter the pressure helmet through the thin rubber tube leading to a special inlet valve below the helmet facepiece, next to the main oxygen inlet.
The suit and helmet are firstly fully pressurised with 100% pure oxygen at 0.275 bar. Helmet pressure increased to 0.315 bar. Then a 75% mix of nitrous oxide is added to the helmet breathing gas to induce gradual sedation. The subject starts to become aware of the effect of the nitrous... eyes start to roll and close and he finds it difficult to hold his helmeted head up.
The final general anaesthetic agent Sevoflurane is then added to the helmet mix. The subject tries to fight the gas as he starts to go under the anaesthesia but then quickly loses consciousness completely., his head inside the heavy pressure helmet falling forward...
Anaesthesia is maintained into the helmet while the unconscious pilot's vital signs and breathing are monitored.
Then the anaesthetic gases are turned off and 100% pure oxygen is fed into the helmet at 0.375 bar to bring the subject round.
Pilot gradually becomes aware as he regains consciousness still wearing the pressure helmet.
A third one here ...
Uploaded on 4 Nov 2011
Michael Lee, a student USAF/NASA research pilot working on the experimental X-80 rocket powered spaceplane undergoing anaesthesia tests in the medical facility at the Dryden Research Centre in California.
Anaesthesia is used in the X-80 programme to help pilots combat the extreme stresses of high G-forces and speeds as the plane escapes the earth's atmosphere.
Pilot is wearing a USAF MC-4C full pressure suit and the new Air Force designed MA-4C full pressure space helmet. Anaesthetic gas enters the helmet through a special valve below the helmet facepiece and next to the standard corrugated rubber oxygen hose. Inside the helmet, the pliot's head is enclosed in a full-head inner rubber pressure unit containing anti-G bladders and the helmet earphones.The helmet microphone is mounted inside the helmet facepiece in front of the pilot's mouth. The helmet is sealed to the pressure suit by an inflatable neck seal bladder.
During the test, the suit and helmet are pressurised with 100% pure oxygen at 3bar pressure. The pilot gives a thumbs up to the technicians running the test to show he's ready to begin the anaesthesia.
70% Nitrous Oxide is mixed with the breathing gas inside the helmet. The pilot becomes aware of the effects.....his eyes start to roll and then become fixed an vacant as awareness starts to go. At about 1.00 minute in the video, the general anaesthetic gas Sevoflurane is added to the helmet mix at 3%. The pilot tries to fight the gas for a few seconds, then his eyes roll up, his head inside the helmet falls forward and he goes under the gas. Unconsciousness is maintained for about 5 minutes while the pliot's vital signs are monitored by sensors under the pressure suit and inside the helmet. In the video, the actual time of unconsciousness has been edited shorter, but the end of the video shows the pilot gradually coming out of the anaesthesia as 100% oxygen is introduced into the space helmet and he regains full awareness with no ill effects.
Nitrous Oxide Induction - the anaesthesiologist guides you through the process.
Enjoy.
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