| 摘要 |
<p>A low wear bearing system for a surgic retractor (10) including usually four bearings (30,32,34,36) recessed in the retractor housing (18), each bearing (30,32,34,36) having a generally rectangular projection (134,234,334,434) extending into a corresponding slot (48,50) in the rack (12) of the rack and pinion type retractor (10). There are two bearings (30,32;34,36) on each side (44;46) of the rack (12) spaced longitudinally along the rack (12). The bearings (30,32,34,36) provide an enlarged buffer area of contact between the rack (12) and the housing (18) to distribute the relatively high internal retraction forces that can be experienced during tissue retraction.</p> |
