| 摘要 |
A disposable surgical stapler having: a) a tubular housing, having an axial bore; b) a central rod, axially located within the bore of the housing and adapted to move distally and proximally within the bore of the housing; c) an anvil, mounted in a predetermined indexed orientation on the distal end of the central rod; d) a staple carrying assembly, mounted in a predetermined indexed orientation on the distal end of the housing, proximally of the anvil; the staple carrying assembly being adapted to be activated, so that its staples are urged distally against the anvil to fasten tissue between the anvil and the staple carrying assembly; e) rotatable moving means, threadedly engaged with the central rod, for moving the central rod distally and proximally within the bore of the housing upon rotation of the moving means; the moving means being rotatably connected to, and extending proximally of, the housing; and the portions of the central rod, threadedly engaged with the moving means, being positioned within the moving means; and f) means, connected to the central rod and the moving means, for indicating that the axial position of the distal end of the central rod relative to the distal end of the housing is such that the spacing between the anvil and the staple carrying assembly is within the range of spacings that is generally suitable for fastening tissue between the anvil and the staple carrying assembly; improved indicating means (f) which comprises: an indicator marking which is connected to the central rod and is adapted to move axially within the moving means between the central rod and the moving means; and a window in the lateral surface of the moving means; the window having a helical distal surface which substantially parallels the helical path of the indicator marking, relative to the moving means, when the moving means is rotated and the indicator marking is located axially of the distal surface; the indicator marking not being laterally covered by the moving means and being continuously visible proximally of, and adjacent to, the distal surface of the window as the moving means is rotated when and only when the spacing between the anvil and the staple carrying assembly is within the range of generally suitable spacings. |
