| 摘要 |
<p>A surgical apparatus (10) includes a first instrument, such as an injection needle (12); a second instrument, such as a snare (14); and a catheter (16) for sheathing the first and second instrument. An actuator (18) is included for extending the first instrument (12), a substantially fixed first length relative to the distal end of the catheter (16); and for retracting the second instrument (14), a variable second length relative to the catheter (16) distal end. The first instrument (12) is biased into retracting relative to the catheter (16) distal end. Preferably, the actuator (18) has a support (40) and a slider (44). The slider (44) is slidably connected to the support (40) for movement in opposite directions relative thereto. The first instrument (12) is secured to the support (40) for movement therewith, and the second instrument (14) is secured to the slider (44) for movement therewith. A rail (50) enables independent but non-simultaneous sliding movement of the first instrument (12) and the second instrument in opposite directions, the rail (50) being longitudinally slideable with respect to the support (40), and operatively connected to the slider (44).</p> |
