Reciprocating heart resuscitator device having fluid pressure control apparatus

Claim 1

HEART RESUSCITATOR APPARATUS COMPRISING A PLUNGER HEAD FOR CHEST-COMPRESSING ENGAGEMENT WITH THE BREASTBONE OF A HEART ARREST VICTIM, A PNEUMATICALLY-OPERATED CHEST-COMPRESSING ACTUATOR OPERATIVELY CONNECTED TO SAID PLUNGER HEAD, VALVE MEANS FOR CONTROLLING SUPPLY AND RELEASE OF COMPRESSED GAS TO AND FROM SAID CHEST-COMPRESSING ACTUATOR, A SNAP-ACTING MEANS FOR OPERATING THE VALVE MEANS TO ASSURE RAPID AND POSITIVE OPERATION THEREOF, PNEUMATICALLY-OPERATED RECIPROCABLE PILOT ACTUATING MEANS FOR OPERATING THE SNAP-ACTING MEANS AND THEREBY OPERATING SAID VALVE MEANS, SAID PILOT ACTUATING MEANS BEING PRESSURIZED AND DEPRESSURIZED BY PENUMATIC FEEDBACK FROM SAID VALVE MEANS, REPETITION-RATE-ADJUSTING MEANS FOR VARYING THE REPETITION RATE OF OPERATION OF SAID SNAP-ACTING MEANS BY SAID ACTUATING MEANS, SEPARATELY-ADJUSTABLE SUPPLY AND RELEASE ADJUSTING MEANS FOR REGULATING OPERATION OF SAID ACTUATING MEANS TO VARY THE PERIODS OF PRESSURIZATION AND DEPRESSURIZATION OF SAID CHEST-COMPRESSING ACTUATOR, RESPECTIVELY, FOR A GIVEN RECIPROCATION CYCLE THEREOF, ADJUSTABLE REGULATING VALVE MEANS CONSTRUCTED AND ARRANGED TO REGULATE PRESSURE OF FLUID ADMITTED TO SAID CHEST-COMPRESSING ACTUATOR WITHOUT AFFECTING PRESSURE OF FLUID ADMITTED TO SAID PILOT ACTUATING MEANS AND THEREBY REGULATE THE POTENTIAL FORCE AVAILABLE AT THE PLUNGER HEAD, AND MEANS FOR INDICATING TO AN OPERATOR THE DEGREE OF SUCH POTENTIAL FORCE.