Charak Samhita
येषु न शस्त्रं क्रमते स्पर्शेन्द्रियनाशनानि यानि स्युः। तेषु निपात्यः क्षारो रक्तं दोषं च विस्राव्य ॥५४॥
When there is loss of sensation and/or surgical interventions is prohibited, kshara should be used after rakta and dosha are eliminated.
english translation
yeSu na zastraM kramate sparzendriyanAzanAni yAni syuH। teSu nipAtyaH kSAro raktaM doSaM ca visrAvya ॥54॥
hk transliteration by Sanscript