Patent ID: 11883183
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A cognitive function evaluation device, comprising:
a storing unit configured to store reference data on a relationship between periodicity of a body movement of a person walking and a cognitive function level of the person;
an acquiring unit configured to acquire body movement data on a detected body movement from a body movement sensor configured to detect the body movement of a subject walking; and
a calculating unit configured to calculate, in real time while the subject is walking, the periodicity of the body movement from the body movement data acquired by the acquiring unit and check the calculated periodicity of the body movement against the reference data stored in the storing unit so as to identify the cognitive function level corresponding to the calculated periodicity of the body movement, wherein
the calculating unit is configured to calculate the periodicity of the body movement, which is the frequency component of any finite range, wherein the range includes at least 6 Hz, the frequency of at least 6 Hz being a frequency component at a frequency higher than a frequency for walking, the calculating unit calculating an integral at a frequency higher than the frequency for walking as the periodicity of the body movement,
the periodicity of the body movement is indicative of a cognitive impairment in the subject,
the body movement data is data on a change in the body movement over time,
the calculating unit is configured to output an evaluation result indicating the identified cognitive function level and to display the evaluation result, the evaluation result including an image indicating the cognitive function level,
the body movement data is data on a change in acceleration of the body movement over time,
the calculating unit is further configured to generate relative position data on a movement of a center of gravity position of the subject from the body movement data and, identify a time period, during which the subject makes a predetermined number of steps while walking, based on the generated relative position data and calculate the step length from the body movement data in the identified time period, the identified time period being a time period after a predetermined time has passed after the subject starts walking, and perform frequency analysis on the body movement data in the identified time period, and
the calculating unit is configured to predetermine the predetermined time.