The copper pestle and mortar from "Eunuch Pharmacy" (Huan Zhe Yao Fu), unearthed in the pit for bathing in the tomb of the King Chu in the Shi Zi Mountain, Xuzhou, Jiangsu Province, was a medical device used for "Eunuch Pharmacy" (Huan Zhe Yao Fu) in the Palace of the King Chu in the Western Han Dynasty. The appearance of copper pestle and mortar with the amount of copper, and the bath apparatus indicates that there was a practice of medical bathing at that time. According to archaeological findings and relevant literature, "Eunuch Pharmacy" (Huan Zhe Yao Fu) was a medical institution which was in charge of eunuchs in the Palace of the King Chu. These findings show that two medical systems existed in the Palace of the King Chu in the Western Han Dynasty. One was the medical system headed by medical officials, another was a medical administrative service organization and mainly implemented by eunuchs, managing the palace medicine and related instruments, processing and using medicine, and testing medicine.
江苏徐州狮子山楚王墓沐浴器陪葬坑中出土的“宦者药府”铜杵臼，为西汉楚王宫内“宦者药府”所使用的医药加工器具。铜杵臼与铜量、沐浴器具共出，表明楚王宫内存在着在沐浴中添加药物的药浴方式。根据出土资料，结合文献记载，“宦者药府”应为楚王宫内由宦者典领的医药机构，该机构的设置说明西汉王宫医疗体系中除了以医官为首的医者系统外，还存在一套主要以宦者担任的医药行政服务机构，职能包括王宫医药及相关器具的管理、医药加工与使用、尝药等。.