Developed over seven years by our dedicated medical research team, U.S. Patent Nos. 11,219,373 and 11,707,198 for the CA Rescue™ Watch disclose a wearable device that automatically detects a suspected cardiac arrest and alerts the nearest emergency medical services. This reduces the likelihood of death or severe morbidity associated with out-of-hospital sudden cardiac arrest events.
The Cardiac Arrest Technologies patents include apparatus, system and method claims that combines a photoplethysmography-based sensor with a miniature laser Doppler-based sensor in a wristwatch to monitor both heart rate and blood flow velocity within arterial vessels of the wrist.
Figure 1
During the development of the CA Rescue™ Watch, tests were performed on human subjects using a miniature 1.6 mm wide x 3.2 mm long x 0.9 mm thick laser Doppler transducer developed and manufactured by Kyocera Corporation (Figure 1).
In these tests, a cardiac arrest was simulated by inflating a pneumatic blood pressure cuff tourniquet applied to the upper arm while using the laser Doppler transducer to transcutaneously measure blood flow velocity in arterial vessels within the wrist.
After blood flow to the lower arm was temporarily interrupted in these tests, the measured blood flow velocity in arterial vessels within the wrist was reduced to an insignificant level within less than seven seconds.
The completed human-use study validated the capability for detecting the prompt cessation of heart function associated with a sudden cardiac arrest.