# US 2013/0158418 A1 · Blood pressure measurement apparatus and blood pressure measurement method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158418 A1 - Document ID: US20130158418A1 - Status: Published application - Kind: A1 - Application number: 13/690,486 - Filed: 2012-11-30 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Assignees: Seiko Epson Corporation - Inventors: Hiromitsu MIZUKAMI - Web page: https://patentgrep.com/patent/US20130158418A1 ## CPC - A61B 5/022: by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers - A61B 5/1075: {for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer (A61B8/0858 takes precedence)} - A61B 5/7225: {Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316)} - A61B 8/04: Measuring blood pressure - A61B 8/0891: {for diagnosis of blood vessels} - A61B 8/5223: {for extracting a diagnostic or physiological parameter from medical diagnostic data (for algorithms to analyse biomedical images G06T7/0012)} - G16H 50/30: for calculating health indices; for individual health risk assessment - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA ## Abstract In an ultrasound blood pressure monitor, a blood pressure diameter measurement section measures blood pressure diameter of a radial artery which is a measurement target based on reception results of ultrasound from an ultrasound sensor. In addition, a pressurizing section adds a pressure from a body surface so that the radial artery is pressed. Then, a correlation formula, which expresses a relationship between blood vessel diameter and blood pressure of the radial artery under pressurization by the pressurizing section, is found and stored in a storage section. Then, a blood pressure calculation section calculates blood pressure using the blood vessel diameter which is measured under pressurization and storage data in the storage section by controlling the pressurization operation of the pressurizing section. ## Claims ### Claim 1 A blood pressure measurement apparatus comprising: a blood vessel diameter measurement section which measures blood vessel diameter of an artery which is a measurement target; a pressurizing section which adds pressure from a body surface so that the artery is pressed; a storage section which stores a relationship between blood vessel diameter and blood pressure of the artery under pressurization by the pressurizing section; and a blood pressure calculation section which calculates blood pressure by controlling a pressurization operation of the pressuring section using the blood vessel diameter, which is measured by the blood vessel diameter measurement section under pressurization, and storage data in the storage section. ### Claim 2 (depends on 1) The blood pressure measurement apparatus according to claim 1, further comprising: a first pressure search section which searches for a pressure by controlling the pressure due to the pressurizing section so as to change so that the variation width in the blood vessel diameter accompanying a pulsation, which is measured by the blood vessel diameter measurement section, satisfies a predetermined condition, wherein the storage section stores the relationship between the blood vessel diameter and the blood pressure of the artery in a state of pressurization with the pressure which has been searched for by the first pressure search section, and the blood pressure calculation section controls the pressurization operation of the pressurizing section so that there is pressurization with the pressure which is searched for by the first pressure search section. ### Claim 3 (depends on 2) The blood pressure measurement apparatus according to claim 2, wherein the first pressure search section searches for a pressure where the variation width of the blood vessel diameter accompanying a pulsation, which is measured by the blood vessel diameter measurement section, exceeds a predetermined variation width threshold which is set based on the relation of pulse pressure and the variation width. ### Claim 4 (depends on 1) The blood pressure measurement apparatus according to claim 1, wherein the blood pressure calculation section controls the pressurization operation of the pressurizing section so as to pressurize with an arbitrary pressure. ### Claim 5 (depends on 4) The blood pressure measurement apparatus according to claim 4, further comprising: a second pressure search section which searches for a pressure by controlling the pressurization by the pressurizing section so as to change so that the blood vessel diameter which is measured by the blood vessel diameter measurement section satisfies a predetermined stability condition, wherein the blood pressure calculation section controls the pressurization of the pressurizing section so that there is pressurization with the pressure which is searched for by the second pressure search section. ### Claim 6 A blood pressure measurement method for a blood pressure measurement apparatus which is provided with a pressurizing section which adds pressure from a body surface so that an artery which is a measurement target is pressed and a storage section which stores the relationship between blood vessel diameter and blood pressure of the artery under pressurization by the pressurizing section, the method comprising: measuring blood vessel diameter of the artery; and calculating blood pressure by controlling a pressurization operation of the pressuring section using the blood vessel diameter under pressurization and storage data in the storage section.