Imikorere ya pulse oximetry

Monitori ya ogisijeni yerekana ijanisha ryamaraso yuzuye ogisijeni.By'umwihariko, ipima ijanisha rya hemoglobine, proteyine mu maraso itwara ogisijeni, yapakiwe.Ibipimo byemewe kubarwayi badafite indwara ya pulmonary kuva kuri 95 kugeza 99%.Kubarwayi bahumeka icyumba cyumuyaga cyangwa hafi yinyanja, ikigereranyo cya arterial pO₂irashobora gukorwa muri monitor ya ogisijeni yamaraso "kwiyuzuza ogisijeni ya periferique" (SpO₂) gusoma.

Ubusanzwe impiswi ya oxyde ikoresha intungamubiri ya elegitoronike hamwe na diode ntoya itanga urumuri (LED) ireba fotodiode binyuze mu gice cyoroshye cyumubiri wumurwayi, ubusanzwe urutoki cyangwa urutoki.LED imwe itukura, ifite uburebure bwa 660 nm, indi ikarengerwa nuburebure bwa 940 nm.Gukuramo urumuri kuri ubu burebure butandukanye cyane hagati yamaraso yuzuye ogisijeni namaraso abura ogisijeni.Oxygene ya hemoglobine ikurura urumuri rwinshi kandi rutuma urumuri rutukura runyura.Deoxygene hemoglobine ituma urumuri rwinshi rutambuka kandi rugatwara urumuri rutukura.LEDs ikurikirana ikizunguruka cyayo kuri imwe, hanyuma iyindi, hanyuma ikazimya inshuro zigera kuri mirongo itatu kumasegonda ituma Photodiode isubiza urumuri rutukura na infragre zitandukanye kandi ikanahindura urumuri rwibanze.

Ingano yumucyo woherezwa (muyandi magambo, itakiriwe) irapimwa, kandi ibimenyetso bitandukanye bisanzwe bikorerwa kuri buri burebure.Ibi bimenyetso bihindagurika mugihe kuko ubwinshi bwamaraso ya arterial ahari ariyongera (mubyukuri pulses) hamwe na buri mutima wumutima.Mugukuramo urumuri ntarengwa rwoherejwe ruva mumucyo wanduye muri buri burebure bwumurongo, ingaruka zizindi ngingo zirakosorwa, bikabyara ibimenyetso bikomeza kumaraso ya arsatial pulsatile. Ikigereranyo cyumucyo utukura wapimye numucyo wa infrarafarike noneho kibarwa numutunganya. .₂nuwutunganya akoresheje imbonerahamwe yo gushakisha ishingiye ku mategeko ya Beer - Lambert.Itandukanyirizo ryibimenyetso naryo rikora izindi ntego: plethysmograph waveform (“pleth wave”) igereranya ibimenyetso bya pulsatile mubisanzwe byerekanwe kumashusho yerekana impiswi kimwe nubwiza bwibimenyetso, hamwe numubare ugereranije numubare uri hagati ya pulsatile no kwinjiza ibice (“perfusion indangagaciro ”) irashobora gukoreshwa mu gusuzuma parufe.