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Heart pulse monitor including a fluxgate sensor

A technology of fluxgate sensors and monitors, applied in the direction of magnetic field sensors, sensors, diagnostic recording/measurement, etc., capable of solving problems such as complex circuits

Inactive Publication Date: 2015-04-29
TEXAS INSTR INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Strapless contact is also known, but requires the user to touch the wrist with the other hand in order to obtain a pulse reading
An alternative known method uses reflective pulse oximetry technology, but it requires relatively complex circuitry (e.g. light emitting diodes (LEDs), detectors, LED drivers, etc.)

Method used

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  • Heart pulse monitor including a fluxgate sensor
  • Heart pulse monitor including a fluxgate sensor
  • Heart pulse monitor including a fluxgate sensor

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[0031] Figure 4A The setup depicted in is used for field simulations of an example cardiac pulse monitor with a fluxgate sensor system comprising a 1500 μm x 100 μm first fluxgate core with 500 nT resolution, 1 mT range and a second Fluxgate cores with a gap (fgGap) of 1 mm between the cores. permanent magnet (diameter 1.6mm, height / thickness 0.8mm) and Figure 4A The nominal distance (fgHeight) between in-plane locations between cores is shown as 0.6mm. Figure 4B The B-field magnitude along the fluxgate axis (axial direction) is depicted.

[0032] Simulations of repeating permanent magnets are about 50x weaker compared to NdFeB grade N42, where the surface field strength is about 100G (10mT). Figure 4C Graphs showing the simulated B-field sensed by a fluxgate sensor system (in mT) as a function of fgHeight (in mm) for various fgGaps. For a 1 mm FgGap, when the pulse causes displacement of the permanent magnet 120, the field change is .014" or 356 μm, which corresponds ...

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Abstract

A heart pulse monitor includes a permanent magnet including a mounting structure for securing the permanent magnet in displaceable contact with a blood vessel of a wearer. The permanent magnet has a thickness defining an axial direction that the permanent magnet is displaceable when blood flows. A fluxgate sensor system is positioned a distance in the axial direction from the permanent magnet to sense an axial magnetic field therefrom. The permanent magnet displaces in the axial direction upon a heart pulse of the wearer resulting in a change in the axial magnetic field which is sensed by the fluxgate sensor system through a change in an induced AC output signal on the sense coil. A processor is coupled to receive information from the induced AC output signal. The processor implements calibration data which converts information from the induced AC output signal into a heart pulse measurement for the wearer.

Description

technical field [0001] Embodiments disclosed herein relate to non-invasive cardiac pulse monitors that include magnets. Background technique [0002] For accurate measurements, conventional 2-point cardiac pulse measurements require electrodes to be placed on both ends of the heart, usually using chest straps or electrodes. Strapless contact is also known, but requires the user to touch the wrist with the other hand in order to obtain a pulse reading. An alternative known method uses reflective pulse oximetry techniques, but this requires relatively complex circuitry (eg light emitting diodes (LEDs), detectors, LED drivers, etc.). Contents of the invention [0003] The disclosed embodiments of the present invention describe a non-invasive cardiac pulse monitor that includes a permanent magnet combined with a fluxgate sensor system and a mounting structure for securing the permanent magnet so that it is compatible with the cardiac pulse monitor's The wearer's blood vessel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0245A61B5/05
CPCA61B5/02444A61B5/0245A61B5/05A61B5/02438A61B2562/0223A61B5/681A61B5/0205A61B5/4866A61B5/742
Inventor S·A·库梅尔A·莫汉V·谢尔菲
Owner TEXAS INSTR INC