Apple has patented a new technology for blood pressure monitoring in smartwatches, which may be incorporated into future Apple Watch models.

The monitoring process involves inflating the chamber to compress the user's wrist, allowing the device to measure vibrations and pressure during inflation and deflation.

Additional sensors, including vibration and pressure sensors, will be integrated to improve the effectiveness of blood pressure measurement.

Blood pressure measurement relies on determining the external pressure needed to stop blood flow, utilizing Korotkoff sounds in a non-invasive manner.

The patent, published by the United States Patent and Trademark Office on November 28, 2024, describes a method inspired by traditional blood pressure monitors that does not rely on optical sensors.

The proposed wearable device features a strap, a pump, an inflatable chamber, and a liquid-filled sensing chamber, which is expected to enhance accuracy and sensitivity compared to air-filled chambers.

If implemented, this blood pressure feature would position Apple alongside competitors like Huawei and Samsung, which already offer direct and optical measurement capabilities.

The design of the device is reminiscent of the Apple Watch, incorporating familiar components such as a crown and side button.

Diagrams in the patent suggest that the design closely resembles the Apple Watch, further indicating Apple's intent to innovate in this space.

The patent specifies the use of liquid in the measurement chamber, although the advantages of using liquid over air are not clearly articulated.

A flowchart in the patent outlines the operation process, detailing how the inflatable chamber expands, measures vibrations, validates readings, and deflates after taking measurements.

Despite ongoing speculation about the inclusion of blood pressure monitoring in the Apple Watch, Apple has not announced a specific timeline for when this feature will be available.