Pulse oximetry

Kelleher, Joseph F.

doi:10.1007/bf01618369

Cited by 181 publications

(66 citation statements)

References 198 publications

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“…~380 nm-~1000 nm. For comparison, a regular oximeter has only two light sources and two narrow band sensors that are being used for each wavelength [19][20][21].…”

Section: Resultsmentioning

confidence: 99%

“…The apparatus is intended for use in the home environment and as well as an additional support in clinics. The TensorTip MTX device consists of a DSP medical and technology uses a color array sensor which allows to provide richer information compared to other known devices, such as a standard pulse oximetry which usually uses two discreet diode sensors and two monochromatic light sources [19][20][21]. …”

Section: Methods the Tensortip Mtx Devicementioning

confidence: 99%

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New Method for Computing Optical Hemodynamic Blood Pressure

Segman¹

2016

J Clin Exp Cardiolog

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Objective: Hypertension is a major risk indicator for coronary heart diseases, renal failure, stroke and other various illnesses, and it is the primary global risk for mortality. Blood pressure measurements are essential for managing the risks resulting from hypertension. In this paper we will present a new device, the TensorTip MTX, which computes hemodynamic blood pressure noninvasively.Methods: This paper presents a technique that uses the color imaging resulting from a set of monochrome light source that traverse the tissue under consideration and is projected onto the color image sensor. A new extended solution of the Windkessel model is being displayed and provides additional insight on various functional resistances rather than a constant resistance. Results:The TensorTip MTX was clinically evaluated in few medical centers and was found to perform well at standard blood pressure measurements and also monitoring patients who suffered from alterations in blood pressure due to cardiac surgery. The device passed successfully our clinical trials and fulfilled the ISO 81060-2 recognized accuracy requirements for various notified bodies. Conclusions:In this work it was found that the variation in the pressure flow can be determined from the changes in the height of the temporal color histograms and additional temporal volume information.Significance: Today, the most common technique is the oscillometric technique based on the sphygmomanometer arm cuff pressure. This paper presents a new device, the TensorTip MTX, which computes hemodynamic blood pressure noninvasively, cuff-less and free of air pumping.

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“…~380 nm-~1000 nm. For comparison, a regular oximeter has only two light sources and two narrow band sensors that are being used for each wavelength [19][20][21].…”

Section: Resultsmentioning

confidence: 99%

Section: Methods the Tensortip Mtx Devicementioning

confidence: 99%

New Method for Computing Optical Hemodynamic Blood Pressure

Segman¹

2016

J Clin Exp Cardiolog

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“…Pulse oximetry [1][2][3][4] ͑the noninvasive measuring of arterial oxygen saturation͒ has, since its invention by Aoyagi in 1973, 5 become a crucial clinical tool for monitoring the health of critically ill, anaesthetized, and recovering patients. 1 It is primarily employed as the earliest warning of hypoxic hypoxia and has become a standard of care in operating and recovery rooms in many countries.…”

Section: Introductionmentioning

confidence: 99%

Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry

Humphreys

Ward

Markham

2007

Review of Scientific Instruments

194

114

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We present a camera-based device capable of capturing two photoplethysmographic ͑PPG͒ signals at two different wavelengths simultaneously, in a remote noncontact manner. The system comprises a complementary metal-oxide semiconductor camera and dual wavelength array of light emitting diodes ͑760 and 880 nm͒. By alternately illuminating a region of tissue with each wavelength of light, and detecting the backscattered photons with the camera at a rate of 16 frames/ wavelength s, two multiplexed PPG wave forms are simultaneously captured. This process is the basis of pulse oximetry, and we describe how, with the inclusion of a calibration procedure, this system could be used as a noncontact pulse oximeter to measure arterial oxygen saturation ͑S p O 2 ͒ remotely. Results from an experiment on ten subjects, exhibiting normal S p O 2 readings, that demonstrate the instrument's ability to capture signals from a range of subjects under realistic lighting and environmental conditions are presented. We compare the signals captured by the noncontact system to a conventional PPG signal captured concurrently from a finger, and show by means of a J. Bland and D. Altman ͓Lancet 327, 307 ͑1986͒; Statistician 32, 307 ͑1983͔͒ test, the noncontact device to be comparable to a contact device as a monitor of heart rate. We highlight some considerations that should be made when using camera-based "integrative" sampling methods and demonstrate through simulation, the suitability of the captured PPG signals for application of existing pulse oximetry calibration procedures.

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“…1000). Most articles are based on transmission pulse oximetry for an Sao2 range of 70-100% , and have been exten sively reviewed elsewhere [8][9][10][11][12],…”

Section: R Nijland Et a L / European Journal O F Obstetricsmentioning

confidence: 99%

Accuracy of fetal pulse oximetry and pitfalls in measurements

Nijland¹,

Jongsma²,

Nijhuis³

et al. 1997

European Journal of Obstetrics & Gynecology and Reproductiv

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Pulse oximetry is a technique for estimating arterial oxygen saturation continuously and non-invasively. Reflectance pulse oximetry might become useful for monitoring the fetus during labour but it is much more susceptible to all kinds of physiological variations than the well-established transmission pulse oximetry for neonatal or adult monitoring. This review focuses on the accuracy of reflectance pulse oximetry. Results of human, animal, in vitro and theoretical models indicate that factors such as; blood volume fraction differences, haematocrit, and blood flow differences are major sources for inaccurate pulse oximetry readings in the fetal arterial oxygen saturation range of 10-80%. These factors cannot be overcome by systems using two wavelengths sensors with the 660/890 or 940 nm combination. Reported precision values (S.D. of difference between pulse oximeter and blood sample saturation) range between 2.5 and 12.9% for various 660 nm sensors. Most sensors were tested only once with a limited number of animals. A new 735/890 nm sensor (Nellcor Puritan Bennett) demonstrates a promising accuracy (precision around 5%) in two studies. Various other sensors have also been developed, but are not or scarcely evaluated. Without thorough establishment of the reliability of this technique, clinical fetal oxygen saturation data are still of limited value.

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Pulse oximetry

Cited by 181 publications

References 198 publications

New Method for Computing Optical Hemodynamic Blood Pressure

New Method for Computing Optical Hemodynamic Blood Pressure

Noncontact simultaneous dual wavelength photoplethysmography: A further step toward noncontact pulse oximetry

Accuracy of fetal pulse oximetry and pitfalls in measurements

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