耳(er)內式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)（in-the-ear，ITE），也稱為耳(er)甲(jia)腔(qiang)(qiang)式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)。耳(er)內式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)是最(zui)早開發(fa)應用(yong)的(de)定制(zhi)式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)。它(ta)占據耳(er)甲(jia)腔(qiang)(qiang)和(he)耳(er)甲(jia)艇(ting)，從解剖(pou)學來講(jiang)，也叫耳(er)甲(jia)式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)。其外(wai)(wai)(wai)殼(ke)是根(gen)據聽(ting)(ting)(ting)障(zhang)者的(de)耳(er)甲(jia)腔(qiang)(qiang)形狀定制(zhi)的(de)，麥(mai)克風、放大(da)(da)器(qi)(qi)(qi)和(he)耳(er)機全部(bu)(bu)放在(zai)定制(zhi)的(de)外(wai)(wai)(wai)殼(ke)內，外(wai)(wai)(wai)部(bu)(bu)不需(xu)要(yao)任何導(dao)線(xian)和(he)軟管，能全部(bu)(bu)放在(zai)耳(er)甲(jia)艇(ting)、耳(er)甲(jia)腔(qiang)(qiang)和(he)外(wai)(wai)(wai)耳(er)道內，比(bi)較(jiao)隱蔽(bi)輕便。此類助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)的(de)麥(mai)克風入口位(wei)于助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)外(wai)(wai)(wai)側面(mian)，比(bi)起耳(er)背式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)更符(fu)合人耳(er)感(gan)受聲(sheng)音的(de)自然位(wei)置，耳(er)內式(shi)(shi)助(zhu)(zhu)聽(ting)(ting)(ting)器(qi)(qi)(qi)體積和(he)面(mian)板(ban)面(mian)積相對(dui)較(jiao)大(da)(da)，使雙(shuang)麥(mai)克風技術較(jiao)易得到(dao)應用(yong)。