Zinthu zomwe muyenera kuzidziwa posankha zothandizira kumva kwa akuluakulu

Zothandizira kumva pamsika zimagawidwa m'mitundu ingapo: mtundu wa bokosi, kuseri kwa--mtundu wa khutu,{2}}mu-mtundu wa khutu, ndi mtundu wa makutu.
1. Bokosi-zothandizira kumva zamtundu wa bokosi zimatchedwanso mtundu wa pocket-mtundu kapena thumba-mtundu. Ndi zazikulu pang'ono kuposa bokosi la machesi. Thupi ndi zomvera m'makutu zimalumikizidwa ndi mawaya. Akagwiritsidwa ntchito, zomvera m'makutu zimayikidwa ku ngalande yakunja ya khutu ndipo bokosilo limayikidwa m'thumba la chifuwa. Ubwino wake ndi kusokoneza pang'ono, mphamvu zazikulu, zosavuta kugwiritsa ntchito, zosavuta kusintha, kugwiritsa ntchito nthawi yaitali, ndi mtengo wotsika, zomwe zingathe kukwaniritsa zosowa za anthu omwe ali ndi vuto losamva kwambiri. Komabe, bokosi lothandizira kumva lamtunduwu limatulutsa phokoso lokangana likayikidwa m'thumba, zomwe zimakhudza tsankho lachilankhulo. Zimawonekera kwambiri zikavala, choncho nthawi zina zimakhala zovuta.
2. Maonekedwe a kumbuyo--chothandizira makutu ndi mbedza yokhota 3-4 cm yaitali. Imayikidwa kumbuyo kwa auricle ndikutumiza phokoso ku ngalande ya khutu kupyolera mu mbedza yooneka ngati nyanga ya khutu ndi chubu la pulasitiki. Ubwino wake ulibe mawaya, kukula kwazing'ono, zobisika kwambiri, zosokoneza pang'ono, ndipo zimatha kukhala ndi coil induction kuti muwonjezere ntchito yomvetsera foni. Zoyipa zake ndikuti nkhungu yapadera yamakutu imafunikira, zomwe sizili zophweka kuzolowera kugwiritsa ntchito koyamba ndipo sizili zophweka kusintha.
3. Mu-zothandizira kumva m'makutu ndi m'makutu zili ndi zida zazing'ono, zobisika, zamawaya-zopanda chifukwa, zosafunikira kupanga makutu, kumva bwino, komanso zimatha kumva bwino; koma ndizovuta kuzisintha komanso zodula, ndipo zimayenera kusinthidwa malinga ndi ngalande ya khutu la munthu aliyense ndi pabowo la concha. Chifukwa cha mphamvu zake zochepa, ndizoyenera kugontha kwapang'onopang'ono ndipo sizoyenera kugontha koopsa komanso koopsa kwambiri.
Posankha chithandizo chakumva, ndi bwino kupita ku chipatala kuti mukafufuze bwino zakumva, kugwiritsa ntchito magetsi audiometry ndi zida zina kuti muyese molondola kuchuluka kwa kusamva, ndikusankha chothandizira kumva. Ngati palibe chipatala chomwe chili ndi zikhalidwe zofananira m'dera lanu, kuchuluka kwa kutayika kwa makutu ndi kusankha kwa mphamvu zothandizira kumva kumatha kuwerengedwa molingana ndi mayeso a pakamwa. Mwachitsanzo, anthu amene samamva kunong’ona amasiya kumva ma decibel 30 mpaka 40, ndipo anthu amene samva mawu ofewa amasiya kumva ma decibel 40 mpaka 50. Pakadali pano, ndi bwino kugula{7}zida zamagetsi zotsika ndi zapakatikati{{8}zothandizira kumva; anthu amene satha kumva mawu wamba amasiya kumva pafupifupi ma decibel 50 mpaka 60, ndipo anthu amene samva kulankhula mokweza amasiya kumva ma decibel 60 mpaka 70. Akhoza kusankha{14}zithandizo zamphamvu zapakatikati ndi{15}zamphamvu kwambiri; anthu amene samva kufuula kokwezeka amasiya kumva ma decibel 70 mpaka 80, motero amatha kusankha zida zoyankhulirana zapakati- ndi zapamwamba{19}zomveka; anthu amene samamva{20}kufuula kokakamiza amasiya kumva pafupifupi ma decibel 80 mpaka 90 kapena kupitilira apo, kotero amatha kusankha{23}mphamvu zokwezeka ndi zowonjezera{24}zokwezeka{25}}zithandizo zamakutu.