ELECTRONIC SPHYGMOMANOMETER

• US 20120226170A1
• Filed: 05/11/2012
• Published: 09/06/2012
• Est. Priority Date: 11/13/2009
• Status: Active Grant

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Doi, Ryosuke, Takeoka, Kohei, Sawanoi, Yukiya, Yanagase, Masataka, Nishioka, Takanori, Horibata, Kenichi, Hachimaru, Izumi
• Granted Patent: US 9,572,500 B2
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02225 using the oscillometric method

Abstract

A first oscillation circuit and a second oscillation circuit are connected to a first pressure sensor and a second pressure sensor, respectively, and oscillate based on the capacity values of the corresponding pressure sensors. The first oscillation circuit and the second oscillation circuit operate in response to instruction from a CPU. The one of the first oscillation circuit and the second oscillation circuit that has received an activation signal from the CPU outputs a signal having a frequency that corresponds to the capacity value of the corresponding pressure sensor. An adjustment circuit is connected to the first oscillation circuit and the second oscillation circuit, and allows one of the frequency signals to pass therethrough, outputting the signal to the CPU.

Claims

1. An electronic sphygmomanometer comprising:

a cuff that is worn on a measurement area;

an inflation and deflation unit that adjusts a pressure applied to the cuff;

a plurality of pressure sensors connected to the cuff;

a plurality of oscillation circuits, provided in correspondence to the respective plurality of pressure sensors, that output a square wave signal of a frequency based on pressures;

an oscillation circuit adjustment circuit, provided in common for the plurality of oscillation circuits, that allows the output from one of the plurality of oscillation circuits to pass; and

a control circuit that accepts an input of the square wave signal from the oscillation circuit adjustment circuit and calculates a blood pressure from the frequency of the square wave signal.

2. The electronic sphygmomanometer according to claim 1,

wherein the oscillation circuit adjustment circuit includes comprises a logic circuit, comprising a plurality of input nodes that accept signals input from the respective plurality of oscillation circuits, that outputs one signal based on a result of a logic process performed on the signals inputted into the plurality of input nodes.

3. The electronic sphygmomanometer according to claim 2,

wherein each of the oscillation circuits outputs a square wave signal of a frequency based on the pressure when the oscillation circuit has been activated in accordance with an instruction, and outputs a fixed voltage signal when the oscillation circuit has not been activated.

4. The electronic sphygmomanometer according to claim 1,

wherein the control circuit switches an oscillation circuit that is active among the plurality of oscillation circuits by outputting an activation signal to the plurality of oscillation circuits.

5. The electronic sphygmomanometer according to claim 4,

wherein the control circuit outputs a first activation signal to a first oscillation circuit among the plurality of oscillation circuits and detects a first cuff pressure based on a frequency of a first square wave signal outputted from the first oscillation circuit,

wherein the control circuit outputs a second activation signal to a second oscillation circuit among the plurality of oscillation circuits and detects a second cuff pressure based on a frequency of a second square wave signal outputted from the second oscillation circuit, and

wherein the control circuit determines whether or not an abnormality has occurred in the plurality of pressure sensors based on a difference between the first cuff pressure and the second cuff pressure.

6. The electronic sphygmomanometer according to claim 5,

wherein the control circuit outputs a third activation signal to the first oscillation circuit among the plurality of oscillation circuits after outputting the first activation signal and the second activation signal, and detects a third cuff pressure based on the frequency of the first square wave signal outputted from the first oscillation circuit, and

wherein the control circuit determines whether or not an abnormality has occurred in the plurality of pressure sensors based on a difference between an average of the first and third cuff pressures and the second cuff pressure.