Electrical stimulator

• US 5,575,809 A
• Filed: 06/11/1993
• Issued: 11/19/1996
• Est. Priority Date: 06/12/1992
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisya Advance
• Original Assignee: Kabushiki Kaisya Advance
• Inventors: Sasaki, Minoru
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US08/075,399
• Time in Patent Office: 1,257 Days
• Field of Search: 607/62, 607/72, 607/22, 607/24, 607/25, 607/44, 600/26, 128/687, 128/905
• US Class Current: 607/62
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61N 1/36031 using physiological parameters for adjustment

Abstract

An object of the present invention is to precisely lock the output of electrical stimulation pulses onto diastolic periods. An electrical stimulator comprises a pulse sensor, a systolic period pulse producing unit for producing a systolic signal using the pulse wave sensor, a signal oscillator for electrical stimulation production, an electrical stimulation pulse output unit for outputting electrical stimulation pulses according to the output signal of the signal oscillator for electrical stimulation production, and a gate for controlling the connection between the signal oscillator for electrical stimulation production and the electrical stimulation pulse output unit according to the systolic signal supplied by the systolic period signal producing unit.

Claims

1. An electrical stimulator, comprising:

a pulse wave sensor;

a differentiating means for differentiating a pulse wave electric signal provided by said pulse wave sensor;

a peak hold means for holding every peak value of a differential signal wave provided by said differentiating means;

a comparing means for comparing an output differential wave of said differentiating means with a peak hold output of said peak hold means, and outputs a pulse lasting during a period commencing when said differential wave causes a potential difference of one polarity with respect to said peak hold output and ending when a potential difference of an opposite polarity occurs between said differential wave and said peak hold output;

an electrical stimulation pulse output means for outputting electrical stimulation pulses during at least part of each of the periods set according to the output pulses of said comparing means, and for stopping the output of electrical stimulation pulses at least at the rise or fall of each of the output pulses of said comparing means.

2. An electrical stimulator according to claim 1 wherein the peak hold means comprises a circuit having a predetermined time constant for holding and decreasing the peak potential.