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Digital pulse oximeter with automatic direction-changing function

  • US 9,474,477 B2
  • Filed: 09/24/2012
  • Issued: 10/25/2016
  • Est. Priority Date: 09/24/2012
  • Status: Active Grant
First Claim
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1. A digital pulse oximeter with automatic orientation change function, comprising a housing that is configured to clamp a human finger being tested, a display window disposed at outside of and atop the housing, a circuit being disposed within the housing for calculating and analyzing tested signals, and displaying them in the display window atop the housing via a display, wherein the circuit has only one control key disposed on the housing and the circuit is connected with a two-axis accelerometer or three-axis accelerometer to control display contents of a display in the display window to be always oriented properly for easy reading;

  • wherein the circuit comprises a light-frequency converter, a red infrared light emitting diode, a light-emitting driving circuit, a microprocessor module, the display and a power supply module, the power supply module supplies power to the light-frequency converter, the red infrared light emitting diode, the light-emitting driving circuit, the microprocessor module, and the display;

    the light-frequency converter transmits a received signal that is emitted by the red infrared light emitting diode and passes through a finger to the microprocessor module;

    the microprocessor module is provided with two input ends which are respectively connected with the two-axis accelerometer or three-axis accelerometer and the control key;

    wherein the microprocessor module has a control table containing a long press-down time and a short press-down time of the control key, and the microprocessor module is configured such that when the control key is pressed, the microprocessor module tests the press-down time of the control key and shifts from one processing function to another according to the length of the press-down time of the control key and the control table.

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