Servo motor for CPR with decompression stroke faster than the compression stroke
AssigneeLaerdal Medical AS
InventorsJostein Håvardsholm, Helge Fossan, Øystein Strømsnes
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Abstract
The invention regards a resuscitation system having a chest compression device to repeatedly compress the chest of a patient and thereafter cause or allow the chest to expand. The device includes an electric motor connected to a compression element. A controller is coupled to the electric motor and causes the motor to actuate the compression element according to a predetermined profile. The controller is further operable to draw the compression element away from a patient's chest upon detecting a malfunction.
Claims31
A method for performing chest compression comprising:
- performing a compression stroke urging a compression element against a patient's chest according to a non-sinusoidal drive profile stored in a controller operably coupled to the compression element;
- performing a decompression stroke drawing the compression element away from the patient's chest according to the non-sinusoidal drive profile, the compression element moving at a greater maximum velocity during the decompression stroke;
- waiting for a delay period according to the drive profile;
- and
- repeating the compression stroke, decompression stroke, and delay period.
A chest compression device comprising:
- a compression element;
- a power source;
- an electric motor coupled to the compression element and operable to actuate the compression element;
- a controller coupled to the electric motor and the power source to regulate the speed of the motor, the controller programmed to cause the electric motor to actuate the compression element according to a periodic non-sinusoidal drive profile, the drive profile including a compression portion in which the electric motor drives the compression element to compress a patient's chest, a decompression portion in which the electric motor drives the compression element away from the patient's chest to allow the chest to decompress, and a wait portion;
- and
- wherein the decompression portion has a maximum motor speed substantially greater than a maximum motor speed of the compression portion.
A chest compression device comprising:
- a compression element comprising a piston;
- a power source;
- an electric motor coupled to the compression element to cause translational movement of the piston;
- and
- a controller programmed to drive an electric motor according to a drive profile, the drive profile including a compression portion in which the electric motor drives the piston of the compression element to compress a patient's chest, a decompression portion in which the electric motor drives the piston of the compression element away from the patient's chest to allow the chest to decompress, and a wait portion, the decompression portion having a maximum motor speed substantially greater than that of the compression portion.
Dependencies are inferred from the claim text.