Electrodes

Gel Yakanyorova Kana Nama NeElectrolytes

Iyo mechanic kana viscous zvimiro zveiyo yekusangana yakakosha, uye kazhinji iyo electrolyte yakakora nechinhu chegel kana iri musiponji kana zvipfeko zvinyoro.Commercial electrocardiogram (ECG) maelectrodes anowanzo kuendeswa senge pregelled midziyo yekushandisa kamwe chete, uye yepakati inogona kunge iine zvinodzivirira kuwedzera hupenyu hwekuchengetedza, kana quartz zvimedu zveabrading zvinangwa paganda.

Kazhinji, iyo ionic kufamba uye saka conductivity mune yakakwirira viscosity paste yakaderera pane mumvura.Wet electrolytes yepamusoro-soro (> 1%) inopinda mukati meganda zvakasimba, ine nguva inogara ichiwanzotaurwa kuva yehurongwa hwe10 min (Tregear, 1966; Almasi et al., 1970; McAdams et al., 1991b).Zvisinei, chaizvoizvo maitiro acho haasi e-exponential (sezvo maitiro ekupararira asiri), uye anogona kuenderera kwemaawa nemazuva (Grimnes, 1983a) (ona Mufananidzo 4.20).Kupinda kwakasimba kwepamusoro kweiyo electrolyte concentration, asiwo yakawanda ganda rinogumbura.NaCl inoregererwa zviri nani neganda remunhu pane yakanyanya kuwanda kupfuura mamwe akawanda ma electrolyte.Mufananidzo 7.5 unoratidza kupinda kwe electrolyte muganda maawa mana ekutanga mushure mekunge electrode yatanga paganda.Impedance pa1 Hz inotongwa ne stratum corneum electrolyte yemukati, ine isingasviki 1% mupiro kubva kune diki-signal polarizing impedance ye electrode.Kana masweet ducts akazadzwa kana kuti achangobva kuzadzwa, mafambisirwo emadhakisi anovhara iyo yakanyanya impedance yeiyo yakaoma stratum corneum.

The conductivity σ yemamwe anowanzo shandiswa contact creams/pastas ndeaya: Redux creme (Hewlett Packard) 10.6 S/m, Electrode creme (Grass) 3.3 S/m, Beckman-Offner paste 17 S/m, NASA Flight paste 7.7 S/m , uye NASA electrode cream 1.2 S/m.NASA Flight paste ine 9% NaCl, 3% potassium chloride (KCl), uye 3% calcium chloride (CaCl), pamwe chete 15% (kuburikidza nehuremu) hwe electrolytes.Gobvu electroencephalogram (EEG) paste inogona kunge iine 45% KCl.

Mukuenzanisa, 0.9% NaCl (kuburikidza nekurema) physiological saline solution ine conductivity ye 1.4 S / m;majiroji akawanda naizvozvo ane simba re electrolytes.Mvura yegungwa ine munyu ungangoita 3.5%, uye Gungwa Rakafa rine > 25% munyu une chidimbu che50% MgCl2, 30% NaCl, 14% CaCl2, uye 6% KCl.Izvo zvakasiyana chaizvo nemunyu wemvura yegungwa (NaCl 97% yehuwandu hwemunyu).Gungwa Rakafa rinonzi “rakafa” nokuti munyu waro wakawanda unotadzisa zvinomera nehove kugaramo.

Chiitiko chakaratidza kuti iyo yakasimba gel, inokurumidza kupinda mukati meganda uye sweat ducts.Nekudaro, maitiro eganda akadai sekutsamwa kweganda uye kutsvuka zvakare nekukurumidza.Nekukurumidza kuongororwa kweECG, gel yakasimba inogona kushandiswa;yekutarisa mukati memazuva, iyo gel yekusangana inofanira kunge isina simba.Vanhu vazhinji vanokoshesa maawa ekugeza mumvura yegungwa, saka munyu we 3.5% muzviitiko zvakawanda unofanira kugamuchirwa.

Pakuita kwe electrodermal (Chitsauko 10.3), gel rinosangana rakanyorova rinofanirwa kunge riine munyu wakaderera kuti rivimbise kubuda nekukurumidza kwemadhaivhi.