A device for sterile coupling of a percutaneous surgical instrument to a rotary drive tool (5). The device has a flexible envelope (1) intended to confine the drive tool (5), a connector piece (3) for coupling to the percutaneous surgical instrument via one end and to the drive tool (5) via its other end by passing through the envelope via an opening (12), and also a tubular ring (2) positioned on the inner surface of the envelope (1) in the area of the opening (12) and configured to rigidly connect the envelope (1) to the body of the drive tool (5). The connector piece (3) is configured to be able to pass through the ring and turn freely inside the ring when driven by the rotary drive tool (5). The connector piece (3), the ring and the envelope have means (22, 34, 14) which interact in order to form a leaktight barrier between the inside and the outside of the envelope (1) in the area of the opening (12).一種用於將經皮外科器械無菌耦接至旋轉驅動工具(5)之裝置。該裝置具有用於封圍該驅動工具(5)之撓性封套(1)、用於經由一末端耦接至該經皮外科器械且經由其另一末端藉由經由開口(12)通過該封套而耦接至該驅動工具(5)之連接器件(3),以及在該開口(12)之區域中被定位在該封套(1)之內表面上且被組構成用以將該封套(1)剛性連接至該驅動工具(5)之本體的管狀環圈(2)。該連接器件(3)被組構成當藉由該旋轉驅動工具(5)驅動時能夠通過該環圈且在該環圈內側自由轉動。該連接器件(3)、該環圈及該封套具有可相互作用以在該開口(12)之該區域中於該封套(1)之內側與外側之間形成密閉障壁之構件(22、34、14)。1‧‧‧封套2‧‧‧管狀環圈3‧‧‧連接器件11‧‧‧袋體12‧‧‧開口14‧‧‧折疊部21‧‧‧管狀部分22‧‧‧末端凸緣23‧‧‧對稱軸線31‧‧‧近端部分32‧‧‧遠端部分34‧‧‧環形突起51‧‧‧末端52‧‧‧耦接件53‧‧‧本體54‧‧‧驅動軸桿
