"Patents for trocars appeared early in the 19th century, although their use dated back possibly thousands of years. By the middle of the 19th century, trocar-cannulas had become sophisticated, such as Reginald Southey's invention of the Southey tube." nghĩa là gì?

"Patents for trocars appeared early in the 19th century, although their use dated back possibly thousands of years. By the middle of the 19th century, trocar-cannulas had become sophisticated, such as Reginald Southey's invention of the Southey tube." nghĩa là gì?

⇒"Bằng sáng chế cho trocar xuất hiện vào đầu thế kỷ 19, mặc dù thời gian sử dụng của chúng có thể hàng ngàn năm. Đến giữa thế kỷ 19, trocar-cannote đã trở nên tinh vi, như phát minh của ống Southey của Reginald Southey."