Umsebenzi wePulse oximetry

I-blood-oxygen monitor ibonisa ipesenti yegazi elifakwe i-oxygen.Ngokukodwa, ilinganisa ukuba yiyiphi ipesenti ye-hemoglobin, iprotheni esegazini elithwala ioksijini, elayishiwe.Uluhlu oluqhelekileyo olwamkelekileyo kwizigulane ezingenazo i-pulmonary pathology zivela kwi-95 ukuya kwi-99 ekhulwini.Kwigumbi lokuphefumla isigulana kumgangatho wolwandle okanye kufuphi nawo, uqikelelo lwe-arterial poO₂inokwenziwa kwimonitha ye-oksijeni yegazi "i-saturation ye-peripheral oxygen" (SpO₂) ukufunda.

I-pulse oximeter eqhelekileyo isebenzisa iprosesa ye-electronic kunye neperi ye-light-emitting diode (i-LEDs) encinci ejongene ne-photodiode ngokusebenzisa indawo eguquguqukayo yomzimba wesigulane, ngokuqhelekileyo incam yomnwe okanye indlebe.Enye i-LED ibomvu, inobude be-660 nm, kwaye enye i-infrared kunye ne-wavelength ye-940 nm.Ukufunxwa kokukhanya kula maza amaza kwahluka kakhulu phakathi kwegazi eligcwele ioksijini kunye negazi eliswele ioksijini.Ihemoglobin eneoksijini ifunxa ngakumbi ukukhanya kwe-infrared kwaye ivumela ukukhanya okubomvu ngakumbi ukuba kudlule.I-hemoglobin ene-deoxygenated ivumela ukukhanya okungaphezulu kwe-infrared ukuba kudlule kwaye ifunxe ukukhanya okubomvu ngakumbi.Ii-LEDs zilandelelana kumjikelo wazo wesinye, emva koko ke zombini zicime malunga namashumi amathathu amatyeli ngesekhondi evumela ifotodiode ukuba iphendule kukukhanya okubomvu kunye ne-infrared ngokwahlukeneyo kwaye ilungelelanise isiseko sokukhanya kwe-ambient.

Isixa sokukhanya esisasazwayo (ngamanye amazwi, esingafunxwanga) siyalinganiswa, kwaye imiqondiso eyahlukileyo eqhelekileyo iyaveliswa kumgama wamaza ngamnye.Ezi zibonakaliso ziyaguquguquka ekuhambeni kwexesha ngenxa yokuba ubungakanani begazi le-arterial elikhoyo liyenyuka (ngokoqobo i-pulses) ngokubetha kwentliziyo nganye.Ngokususa ukukhanya okuncinci okugqithisiweyo ukusuka ekukhanyeni okugqithisiweyo kwi-wavelength nganye, iimpembelelo zezinye izicubu zilungiswa, zivelisa umqondiso oqhubekayo we-pulsatile arterial blood. (emele umlinganiselo wehemoglobin eneoksijini ukuya kwihemoglobin eneoksijini), kwaye lo mlinganiselo uguqulelwa kwi-SpO₂ngeprosesa ngetafile yokujonga esekwe kumthetho weBeer-Lambert.Ukwahlulwa komqondiso kukwasebenza nezinye iinjongo: i-plethysmograph waveform (“pleth wave”) emele isiginali ye-pulsatile idla ngokuboniswa ukubonisa okubonakalayo kwee-pulses kunye nomgangatho womqondiso, kunye nomlinganiselo wamanani phakathi kwe-pulsatile kunye ne-baseline absorbance (“perfusion index”) inokusetyenziselwa ukuvavanya i-perfusion.