US 11,696,702 B2
Breath analysis system, device and method employing nanoparticle-based sensor
Lubna M. Ahmad, Chandler, AZ (US); Rhett L. Martineau, Chandler, AZ (US); Salman A. Ahmad, Chandler, AZ (US); and Zachary Smith, Phoenix, AZ (US)
Assigned to Invoy Holdings Inc., Irvine, CA (US)
Filed by Invoy Holdings, LLC, Aliso Viejo, CA (US)
Filed on May 27, 2020, as Appl. No. 16/884,830.
Application 16/884,830 is a continuation of application No. 15/156,188, filed on May 16, 2016, granted, now 10,694,978.
Claims priority of provisional application 62/161,872, filed on May 14, 2015.
Prior Publication US 2020/0281504 A1, Sep. 10, 2020
Int. Cl. A61B 5/08 (2006.01); A61B 5/097 (2006.01)
CPC A61B 5/082 (2013.01) [A61B 5/097 (2013.01); A61B 2560/0214 (2013.01); A61B 2562/0285 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A portable measurement device for measuring acetone in a breath sample of a user, the measurement device comprising:
a housing;
a mouthpiece for receiving the breath sample from a respiratory tract of the user;
a flow path disposed within the housing and comprising an upstream end and a downstream end, the upstream end of the flow path being in fluid communication with the mouthpiece, wherein in normal operation of the device the flow path directs the breath sample in a downstream direction from the mouthpiece at the upstream end of the flow path and toward the downstream end;
a nanoparticle-based sensor disposed in the housing in fluid communication with the flow path and at an intermediate location between the upstream end and the downstream end;
a temperature sensor disposed in the housing proximate the nanoparticle-based sensor;
a temperature control circuit connected to the nanoparticle-based sensor to adjust a temperature of the nanoparticle-based sensor; and
a flow control device disposed in the housing and in the flow path between the upstream end and the downstream end that prevents flow of the breath sample in an upstream direction opposite the downstream direction, the flow control device thereby inhibiting inhalation by the user of gas heated by the nanoparticle-based sensor.