US10426392B2 – October 1, 2019 – Systems and methods for determination of cannabis impairment using a triaxial gyroscope assembly

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Inventors :

Gary W. Felsing; Daniel K. Sunnarborg

Owner :

MOTUS BIOENGINEERING INC., CALIFORNIA

Application Number :

US15853459

Document Number :

US10426392B2

Priority Date :

December 22, 2017

Filing Date :

December 22, 2017

Date of Grant/ Publication :

October 1, 2019

Class :

G08B21 / 00; A61B5 / 18; A61B5 / 11; G01C19 / 00; A61B5 / 00; A61B5 / 107; G06K9 / 00

Abstract

The invention provides systems and methods to determine cannabis impairment using gyroscopes to sense impaired movement of a suspect. The system includes a triaxial gyroscope assembly that transmits wireless signals indicative of the movement to a computing device configured to receive and store the signals and compute and display cannabis impairment of the suspect based on the signals. The method identifies cannabis impairment, including attaching a triaxial gyroscope assembly to a suspect, computing signals indicative of the movement, transmitting the signals to a computing device, and displaying an indicator of cannabis impairment on the computing device.

Claim(s)

1. A system for a law enforcement officer’s determination of cannabis impairment of a suspect having THC content, comprising: a triaxial gyroscope assembly configured to attach to a suspect to sense the angular rate of the suspect’s movement and transmit signals indicative of the suspect’s movement in accordance with a wireless communication protocol; and a computing device, spaced apart from the triaxial gyroscope assembly, configured to receive and store the signals indicative of the suspect’s movement during the law enforcement officer’s application of predetermined psychophysical tests, wherein the tests include a finger to nose test, a walk and turn test, a modified Romberg balance test, and a one leg stand test on the suspect, and to use the root sum squared (RSS) equation on the signals indicative of the suspect’s movement to display RSS signals of the angular rate of movement versus time and to quantify the number of failures on each test demonstrated by abnormal and excessive suspect movement test data obtained during performance of the tests that indicate cannabis impairment rather than THC content of the suspect.;
9. A method for testing a suspect for cannabis impairment using a triaxial gyroscope assembly that communicates with a computing device, comprising: attaching a triaxial gyroscope assembly that outputs data indicative of the angular rate of the suspect’s movement during a set of psychophysical tests, wherein the tests include a finger to nose test, a walk and turn test, a modified Romberg balance test, and a one leg stand test on the suspect; reading the output data in a microcontroller; formatting a record of the output data; storing the formatted record in a memory; formatting a record of the output data for Bluetooth transmission; sending the formatted record to a computing device; and computing whether the suspect is cannabis impaired based upon the data record of the suspect’s movement during the psychophysical tests as sensed by the triaxial gyroscope assembly, wherein the output data record is generated by use of root sum squared (RSS) equation on the data indicative of the angular rate of the suspect’s movement versus time and quantifies the suspect’s number of failures on each test used as demonstrated by abnormal and excessive suspect movement test data obtained during performance of the tests that indicate cannabis impairment rather than THC content of the suspect.

Summary

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