Ihe nleba anya ikuku oxygen na-egosiputa pasenti ọbara nke jupụtara na oxygen.Kpọmkwem, ọ na-atụ pasent ole hemoglobin, protein dị n'ọbara nke na-ebu oxygen, na-ebu.Oke nkịtị anabatara maka ndị ọrịa na-enweghị pathology akpa ume sitere na pasent 95 ruo 99.Maka onye ọrịa iku ume ụlọ ikuku na ma ọ bụ nso oke osimiri, atụmatụ nke arterial pO2Enwere ike ime ya site na nyocha ọbara-oxygen "saturation nke ikuku oxygen" (SpO2) ịgụ ihe.
A na-ahụkarị pulse oximeter na-eji igwe eletrọnịkị na otu ụzọ obere ọkụ na-emitting diodes (LEDs) chere fotodiode ihu site na akụkụ translucent nke ahụ onye ọrịa, na-abụkarị mkpịsị aka ma ọ bụ ntị ntị.Otu ikanam na-acha ọbara ọbara, yana ogologo ogologo nke 660 nm, nke ọzọ bụ infrared nwere ogologo ogologo nke 940 nm.Mmụba nke ìhè n'ogo nfe ndị a dị nnọọ iche n'etiti ọbara jupụtara na oxygen na ọbara enweghị oxygen.Hemoglobin oxygen na-amịkọrọ ìhè infrared ma na-enye ohere ka ọkụ na-acha uhie uhie gafere.Hemoglobin deoxygenated na-enye ohere ka ìhè infrared ka ukwuu gafere ma na-amịkọrọ ọkụ na-acha uhie uhie.Usoro nke LEDs site na okirikiri ha nke otu na, nke ọzọ, wee gbanyụọ ihe dị ka ugboro iri atọ kwa nkeji nke na-enye ohere ka photodiode zaghachi na ọkụ na-acha uhie uhie na infrared iche ma gbanwee maka ntọala ìhè ambient.
A na-atụ oke ọkụ a na-ebunye (n'okwu ndị ọzọ, nke na-adịghị etinye ya n'ime ya), ma na-emepụta akara ngosi dị iche iche maka ogologo ogologo ọ bụla.Ihe mgbaàmà ndị a na-agbanwe n'oge n'ihi na ọnụ ọgụgụ ọbara akwara dị ugbu a na-abawanye (n'ụzọ nkịtị pulses) na obi ọ bụla.Site n'iwepụ ọkụ kacha nta na-ebufe site na ọkụ a na-ebunye n'ogologo ọ bụla, a na-edozi mmetụta nke anụ ahụ ndị ọzọ, na-emepụta mgbaàmà na-aga n'ihu maka ọbara akwara pulsatile. A na-agbakọọ nha nke nha ọkụ uhie na nha ọkụ infrared site na onye nhazi. (nke na-anọchi anya oke hemoglobin oxygenated na hemoglobin deoxygenated), a na-atụgharịkwa oke a ka ọ bụrụ SpO.2site na nhazi site na tebụl nchọgharị dabere na iwu Beer–Lambert.Nkewa nke mgbaàmà na-arụkwa ọrụ ndị ọzọ: plethysmograph waveform ("pleth wave") na-anọchi anya akara ngosi pulsatile a na-egosipụtakarị maka ihe ngosi anya nke ọkpụkpụ yana àgwà mgbaàmà, yana ọnụọgụ ọnụọgụ n'etiti pulsatile na baseline absorbance ("perfusion"). index") nwere ike iji nyochaa perfusion.
Oge nzipu: Jul-01-2019