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US 7,925,338 B2Granted
Determination of the anesthetic state of a patient
AssigneeGeneral Electric Company
InventorMatti Huiku
Life of this patent
Estimating the term…
Abstract
The invention relates to the determination of the anesthetic state of a patient. In order to achieve a mechanism that enables establishment and maintenance of balanced anesthesia, values are established for a set of diagnostic indices. The set includes at least two diagnostic indices of which a first diagnostic index is indicative of the level of hypnosis and a second diagnostic index of the level of nociception in the patient. The combination of the at least two index values obtained is employed for indicating the anesthetic state of the patient. The combination of the at least two index values may further be employed to control the administration of drugs to the patient.
Claims42
A method for determining the anesthetic state of a patient, the method comprising the steps of:
- establishing, using a computer unit, a first index value indicating the current anesthetic state within a predetermined first value range for a first diagnostic index that is indicative of the hypnotic level in the patient;
- establishing, using the computer unit, a second index value for the current anesthetic state in a predetermined second value range for a second diagnostic index that is indicative of the level of analgesia in the patient;
- and
- utilizing the computer unit to employ the first and second index values to indicate the anesthetic state of the patient, wherein the first and second index values are indicated to the user through an indicator unit by displaying at least two trend curves, each trend curve representing the values of a corresponding diagnostic index during a preceding time period of a certain length.
1 more element
An apparatus for determining the anesthetic state of a patient, the apparatus comprising:
- first means for establishing, a first index value for the current anesthetic state of the patient in a predetermined first value range for a first diagnostic index that is indicative of the hypnotic level of the patient and a second index value for the current anesthetic state of the patient in a predetermined second value range for a second diagnostic index that is indicative of the level of analgesia in the patient;
- second means for employing the first and second index values to indicate the anesthetic state of the patient;
- and
- an indicator unit for indicating the at least two index values to a user, wherein the indicator unit is configured to display at least two trend curves, each trend curve representing the values of a corresponding diagnostic index during a preceding time period of a certain length.
1 more element
A method for determining the anesthetic state of a patient, the method comprising the steps of:
- establishing, using a computer unit, a first index value indicating the current anesthetic state within a predetermined first value range for a first diagnostic index that is indicative of the hypnotic level in the patient;
- establishing, using the computer unit, a second index value for the current anesthetic state in a predetermined second value range for a second diagnostic index that is indicative of the level of analgesia in the patient, wherein the establishing step comprises the sub-steps of:
- acquiring a first measurement signal containing physiological data indicative from the patient;
- applying a first normalization transform to the first measurement signal, the first normalization transform being dependent on the distribution of previous signal data of said first measurement signal, whereby a first normalized measurement signal having a predetermined value range is obtained;
- forming a normalized index proportional to the first normalized measurement signal;
- employing the normalized index as the second diagnostic index;
- and
- utilizing the computer unit to employ the first and second index values to indicate the anesthetic state of the patient.
5 more elements
An apparatus for determining the anesthetic state of a patient, the apparatus comprising:
- first means for establishing a first index value for the current anesthetic state of the patient in a predetermined first value range for a first diagnostic index that is indicative of the hypnotic level of the patient and a second index value for the current anesthetic state of the patient in a predetermined second value range for a second diagnostic index that is indicative of the level of analgesia in the patient, wherein the first means comprises;
- means for acquiring a first measurement signal containing physiological data indicative of the cardiovascular function of the patient;
- first transform means for applying a first normalization transform to the first measurement signal, the first normalization transform being dependent on the distribution of previous signal data of said first measurement signal, whereby a first normalized measurement signal having a predetermined value range is obtained;
- means for forming an index proportional to the first normalized measurement signal, said index serving as the second diagnostic index;
- and
- second means for employing the first and second index values to indicate the anesthetic state of the patient.
3 more elements
A system for controlling the anesthetic state of a patient, the system comprising:
- means for establishing a first index value for the current anesthetic state in a predetermined first value range for a first diagnostic index that is indicative of the hypnotic level of the patient and a second index value for the current anesthetic state in a predetermined second value range for a second diagnostic index that is indicative of the level of analgesia in the patient, wherein the means comprises;
- means for acquiring a first measurement signal containing physiological data indicative of the cardiovascular function of the patient;
- first transform means for applying a first normalization transform to the first measurement signal, the first normalization transform being dependent on the distribution of previous signal data of said first measurement signal, whereby a first normalized measurement signal having a predetermined value range is obtained;
- means for forming an index proportional to the first normalized measurement signal, said index serving as the second diagnostic index;
- and
- drug delivery means for administering at least one drug to the patient, wherein the at least one drug belongs to a group of drugs including at least one analgesic drug and at least one hypnotic drug;
- and
- control means for controlling the drug delivery means based on the first index value and the second index value.
5 more elements
Dependencies are inferred from the claim text.