Driving control of a reciprocating CPR apparatus
AssigneePhysio-Control, Inc.
InventorsAnders Nilsson, Peter Sebelius
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Abstract
A method of controlling the amount of compressed gas used for driving a reciprocating apparatus for cardio-pulmonary resuscitation (CPR) comprising a valve means for controlling the provision of driving gas comprises operation of the valve means during the compression phase to stop provision of driving gas, which operation is separated in time from the venting of the driving gas from the apparatus at the end of the compression phase. Also disclosed are; a CPR apparatus operated by the method; a method of compression depth sensing.
Claims11
A method of sensing a compression depth in a reciprocating apparatus for cardio-pulmonary resuscitation (CPR) having a reciprocating plunger assembly within a non-reciprocating housing, the method comprising:
- sensing, with an array of magnetic sensors on the housing and for different positions of the plunger assembly, a magnetic field emanating from a permanent rod magnet reciprocating with the plunger assembly, the permanent rod magnet having a pole facing the housing, the array of magnetic sensors including more than two magnetic sensors positioned between an upper extent of a stroke of the plunger assembly and a lower extent of the stroke, and the plunger assembly including a counterweight diametrically opposite to the rod magnet;
- creating an electrical signal in at least one of the magnetic sensors by sweeping the at least one of the magnetic sensors with the magnetic field;
- and
- transmitting the signal to a microprocessor unit that records an arrival time of the signal.
An apparatus for cardio-pulmonary resuscitation (CPR) comprising:
- a cylinder housing having a diamagnetic wall;
- a diamagnetic plunger assembly configured to reciprocate within the housing;
- a rod magnet configured to emit a magnetic field and configured to reciprocate with the plunger assembly, the rod magnet having a pole facing the housing, and the plunger assembly including a counterweight diametrically opposite to the rod magnet;
- and
- an array of magnetic sensors on a surface of the housing, the array of magnetic sensors including more than two magnetic sensors positioned between an upper limit of a stroke of the plunger assembly and a lower limit of the stroke, each of the sensors in the array of magnetic sensors being configured to detect when the magnetic field exceeds a threshold during each of a plurality of reciprocation cycles and, when the magnetic field exceeds the threshold, to transmit a signal.
Dependencies are inferred from the claim text.