How do you cure a blocked urinary tract?

In 1455 A.D. a petition was submitted to the Ceremonies Board of Joseon's State Council requesting that a list of people be recognized for their filial piety, among other things. First on the list was a student named Lee Hyo-saeng, who definitely went above and beyond the call of duty for a devoted son. Here is the LINK, and here is his story:

Chinese Text:

議(의)政(정)府(부)據(거)禮(예)曹(조)呈(정)啓(계): “京(경)畿(기)竹(죽)山(산)縣(현)學(학)生(생)李(이)孝(효)生(생), 事(사)父(부)母(모)盡(진)孝(효), 晨(신)夕(석)不(부)廢(폐)定(정)省(성), 有(유)所(소)得(득)必(필)獻(헌)。 母(모)死(사)三(삼)年(년)不(부)輟(철)悲(비)哀(애), 父(부)病(병)小(소)便(변)不(불)通(통), 吮(전)而(이)通(통)之(지)。

English Translation:

Petition to the Ceremonies Board of the State Council (議政府據禮曹呈) reported (啓):

“Lee Hyo-saeng, a student from the village of Juksan in Gyeonggi Province (京畿竹山縣學生李孝生), served (事) [his] parents (父母) with the utmost (盡) filial piety (孝). In the morning (晨) [and] the evening (夕), without fail (不廢), [he] checked on them (定省). [If he] had (有) income (所得), [he] invariably (必) gave (獻) it (之) [to them]. [When his] mother (母) died (死), [for] three years (三年) [he] didn’t (不) stop (輟) grieving (悲哀). [When his] father (父) was sick (病) [and] had no urine flow (小便不通), [he] sucked (吮), and (而) cleared (通) it (之).

Korean Translation:

“경기(京畿)의 죽산현(竹山縣) 학생(學生) 이효생(李孝生)은 부모(父母)를 섬기는 데 효도를 다하여 아침 저녁으로 혼정 신성(昏定晨省) 을 폐하지 아니하고 음식을 얻으면 반드시 이를 바쳤고, 어미가 죽자 3년 동안 비통하고 애통하기를 그치지 않았으며, 아비가 병들어 소변(小便)이 통하지 않게 되자 이를 빨아서 통하게 하였습니다.

HERE is a link to an interesting MBC Radio broadcast that mentions the above story.