| 摘要 |
<p>A cannula comprises a proximal instrument insertion portion (951) having a seal (952) for sealingly engaging with an instrument shaft (955), and a distal tubular portion (950) defining an access channel for extension of the instrument (955) therethrough. The proximal portion (951) is movably coupled to the distal portion (950) to facilitate relative movement between the proximal portion (951) and the distal portion (950) to accommodate lateral movement of the instrument (955) passing therethrough whilst maintaining sealing engagement between the seal (952) and the instrument shaft (955).</p> |
