Division approximation for implantable medical devices

A method for determining a ratio approximation for incorporation in a neurological event detection calculation used to analyze a neurological event status of a patient and carried out by a self-powered implantable or wearable medical device, the method comprising:

• obtaining a first fixed point number correlated to a first physiological parameter measurement;
• obtaining a second fixed point number correlated to a second physiological parameter measurement;
• calculating a ratio approximation of the first fixed point number over the second fixed point number by using a method consisting essentially of raising 2 to the power of the difference between a most significant set bit position of the second fixed point number and a most significant set bit position of the first fixed point number;
• and
• detecting a neurological event based on the ratio approximation with the self-powered implantable or wearable medical device.

A method for characterizing neurological energy for incorporation in a neurological event detection calculation carried out by a self-powered implantable or wearable medical device to analyze a neurological event status of a patient, the method comprising:

• obtaining a first fixed point number correlated to a foreground neurological energy measured by the self-powered implantable or wearable medical device;
• obtaining a second fixed point number correlated to a background neurological energy measured by the self powered implantable or wearable medical device;
• and
• determining with the self-powered implantable or wearable medical device an approximate ratio of the foreground neurological energy divided by the background neurological energy by calculating an approximate ratio of the first fixed point number over the second fixed point number by using a method consisting essentially of raising 2 to the power of the difference between a most significant set bit position of the second fixed point number and a most significant set bit position of the first fixed point number.

An implantable medical device having a processor programmed with instructions for executing a method for analyzing neurological energy for incorporation in a neurological event determination, the method comprising

• obtaining a first fixed point number correlated to a foreground neurological energy;
• obtaining a second fixed point number correlated to a background neurological energy;
• and
• determining an approximate ratio of the foreground neurological energy divided by the background neurological energy by calculating an approximate ratio of the first fixed point number over the second fixed point number by using a method consisting essentially of raising 2 to the power of the difference between a most significant set bit position of the second fixed point number and a most significant set bit position of the first fixed point number.

A wearable medical device having a processor programmed with instructions for executing a method for analyzing neurological energy for incorporation in a neurological event determination, the method comprising

• obtaining a first fixed point number correlated to the foreground neurological energy;
• obtaining a second fixed point number correlated to the background neurological energy;
• and
• determining an approximate ratio of a foreground neurological energy divided by a background neurological energy by calculating an approximate ratio of the first fixed point number over the second fixed point number by using a method consisting essentially of raising 2 to the power of the difference between a most significant set bit position of the second fixed point number and a most significant set bit position of the first fixed point number.

A computer readable medium having computer executable instructions for causing a processor to execute a method for analyzing neurological energy for incorporation in determining the occurrence of a neurological event in a patient, the method comprising

• obtaining a first fixed point number correlated to a foreground neurological energy of the patient;
• obtaining a second fixed point number correlated to a background neurological energy of the patient;
• and
• determining an approximate ratio of the foreground neurological energy divided by the background neurological energy by calculating an approximate ratio of the first fixed point number over the second fixed point number by using a method consisting essentially of raising 2 to the power of the difference between a most significant set bit position of the second fixed point number and a most significant set bit position of the first fixed point number.