Pulse detecting apparatus

• US 5,339,819 A
• Filed: 11/10/1993
• Issued: 08/23/1994
• Est. Priority Date: 08/22/1990
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takashima, Mitsuru
• Primary Examiner(s): Willse, David H.
• Application Number:
  US08/150,270
• Time in Patent Office: 286 Days
• Field of Search: 128/681-683, 128/688, 128/680, 128/
• US Class Current: 600/494
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02444 Details of sensor A61B5/02427 takes precedence
• CPC Class Codes: A61B 5/4854 Diagnosis based on concepts of traditional oriental medicine
• CPC Class Codes: A61B 7/045 Detection of Korotkoff sounds A61B5/0225 takes precedence; measuring blood pressure A61B5/021

Abstract

A pulse detecting apparatus includes a combination of a pressure sensor; a minimum value detecting circuit for detecting a minimum value of the output of the pressure sensor; a maximum value detecting circuit for detecting a maximum value of the output of said pressure sensor; pressure applying member for biasing the a pressure sensor upon an artery; a static pressure sensor for detecting the biasing pressure to bias the pressure sensor of the pressure applying means upon the artery; and measured pressure detecting circuit for detecting based upon the output of the static pressure sensor the biasing pressures of said pressure applying member corresponding to the minimum and maximum value detected by said minimum and maximum values detecting means, respectively when the biasing pressure of the pressure applying member is decreased from a given value. A biasing pressure for biasing the pressure sensor of the pressure applying member upon the artery at which pulses necessary for the sphygmic diagnosis can be obtained, that is, the measured pressure, can be accurately determined.

Claims

1. A pulse detecting apparatus, comprising:

a first pressure sensor;

a minimum value detecting means for detecting a minimum value of the output of said first pressure sensor;

a maximum value detecting means for detecting a maximum value of the output of said first pressure sensor;

pressure applying means for biasing said first pressure sensor upon an artery;

a second pressure sensor for detecting a static biasing pressure to bias said first pressure sensor of said pressure applying means upon the artery; and

measured pressure detecting means for detecting, based upon the output of said second pressure sensor, the biasing pressures of said pressure applying means corresponding to the minimum and maximum values detected by said minimum and maximum value detecting means, respectively, when the biasing pressure of the pressure applying means is decreased from a given value, said measured pressure detecting means including means for storing output values of said second pressure sensor representative of the biasing pressures of said pressure applying means obtained at a first time period when minimum and maximum values are detected by said minimum and maximum value detecting means, respectively, and further including comparing means for comparing the respective values stored in said storing means at said first time with the outputs from said second pressure sensor obtained at a second time period, said second time period corresponding to a period occurring when the biasing pressure of said pressure applying means is decreased again from the given value increased by said pressure applying means and after the output values of said second pressure sensor obtained during said first time period have been stored in said storing means of said measured pressure detecting means; and

pulse data recording means for storing detected outputs of said first pressure sensor corresponding to one heart beat, said detected outputs stored in said data recording means indicating values at a period at which the comparing means determines that an output value of said second pressure sensor at said first time period is equal to the corresponding output value of said second pressure sensor at said second time period.

2. A pulse detecting apparatus, comprising:

a first pressure sensor;

a minimum value detecting means for detecting a minimum value of the output of said first pressure sensor;

a maximum value detecting means for detecting a maximum value of the output of said first pressure sensor;

pressure applying means for biasing said pressure sensor upon an artery;

a second pressure sensor for detecting a static biasing pressure to bias said pressure sensor of said pressure applying means upon the artery; and

measured pressure detecting means for detecting, based upon the output of said second pressure sensor, the biasing pressures of said pressure applying means corresponding to the minimum and maximum values detected by said minimum and maximum value detecting means, respectively, when the biasing pressure of the pressure applying means is decreased from a given value, and further including heart beat detecting means for detecting beats of a heart from the detected outputs of said first pressure sensor;

wherein said measured pressure detecting means further includes a first storing means for storing pulse data which are detected outputs from said first pressure sensor based upon the detected outputs from said heart beat detecting means, said pulse data being stored for a period of one heart beat;

wherein said maximum value detecting means includes second storing means to which the outputs of said first storing means are transferred and first comparing means for comparing the outputs from said second storing means with the outputs from said first storing means; and

wherein said minimum value storing means includes third storing means to which the outputs from said first storing means are transferred and second comparing means for comparing the outputs from said third storing means with the outputs from said first storing means.

3. A pulse detecting apparatus as defined in claim 2 in which said measured pressure detecting means includes means for storing the outputs of said second pressure sensor representative of biasing pressures of said pressure applying means corresponding to minimum and maximum values detected by said minimum and maximum value detecting means, respectively.