Digital control method for measuring blood pressure
First Claim
Patent Images
1. A device for continuous blood pressure measurement comprising:
- a pressure cuff adapted to be placed over an artery in a human finger, the cuff including a PPG system having at least one light source and at least one light detector, the at least one light detector being associated with a light-to-frequency (LFC) conversion device that is configured for producing an AC signal based on light intensity measured from the one or more light detectors, wherein a frequency of the AC signal is representative of blood volume in the artery;
a pressure system comprising;
at least one pump,at least one valve or valve system, andat least one pressure sensor; and
a controller configured for controlling pressure in the cuff by altering the valve or valve system and holding the AC signal substantially constant by altering the pressure in the cuff.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method of digital control for a blood pressure measurement system is provided. According to at least one embodiment, a photo-plethysmographic (PPG) system produces a frequency signal that corresponds to the measured light in the PPG system. Such light may be indicative of blood volume in a vein or artery. The frequency signal may be used to control one or more pressure valves of the system in order to measure blood pressure and hold the frequency signal constant.
-
Citations
18 Claims
-
1. A device for continuous blood pressure measurement comprising:
-
a pressure cuff adapted to be placed over an artery in a human finger, the cuff including a PPG system having at least one light source and at least one light detector, the at least one light detector being associated with a light-to-frequency (LFC) conversion device that is configured for producing an AC signal based on light intensity measured from the one or more light detectors, wherein a frequency of the AC signal is representative of blood volume in the artery; a pressure system comprising; at least one pump, at least one valve or valve system, and at least one pressure sensor; and a controller configured for controlling pressure in the cuff by altering the valve or valve system and holding the AC signal substantially constant by altering the pressure in the cuff. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for continuously measuring blood pressure comprising:
-
placing a photo-plethysmographic (PPG) system over an artery or vein in a human finger, the PPG system producing a PPG signal based on volume of the artery or vein, the PPG system including at least one light source and at least one light detector; utilizing a computing device to alter a pressure inside the cuff by altering a valve or valve system that is connected to a pump and pressure sensor, wherein, based on the measured blood volume of the artery or vein, a frequency signal is produced by a light-to-frequency conversion (LFC) device, and wherein the computing device holds the frequency signal substantially constant by altering the cuff pressure. - View Dependent Claims (13, 14, 15)
-
-
16. A sensor for continuously measuring blood pressure comprising:
-
a pressure cuff adapted to be placed over an artery in a human finger; a PPG system inside the cuff having at least one light source and at least one light detector, the at least one light detector being configured as a light-to-frequency (LFC) conversion device, wherein the LFC device produces an AC frequency signal that is representative of the volume of blood in the artery; one or more air connectors for applying pressure to the cuff; and at least one computing device comprising; a processor; and memory storage coupled to the processor having stored thereon instructions, which, when executed by the processor, cause the computing device to carry out functions, the functions comprising causing the one or more air connectors to apply a continuously-changing amount of pressure to the cuff such that the AC frequency signal has a substantially constant frequency, the continuously-changing amount of pressure being representative of a blood pressure measurement for the artery. - View Dependent Claims (17, 18)
-
Specification