Surgical stapling device
First Claim
1. A surgical stapling device comprising:
- a handle portion;
a body portion;
a head portion including an anvil assembly and a shell assembly;
an approximation mechanism including an approximation knob, a drive screw and an anvil retainer, the anvil retainer being operably connected to the drive screw, the drive screw including a helical channel having a first pitch, wherein the approximation knob is operably connected to a pin which is positioned within the helical channel such that rotation of the approximation knob effects linear movement of the anvil retainer between a first advanced position and a second retracted position;
wherein the anvil assembly includes an anvil center rod configured to releasably engage the anvil retainer, the approximation mechanism being operable to retract engaged portions of the anvil center rod and the anvil retainer within the shell assembly to lock the anvil center rod to the anvil retainer; and
wherein the helical channel of the screw includes a dwell portion, the dwell portion of the helical channel having a second pitch which is smaller than the first pitch, the dwell portion being positioned along the helical channel to provide a tactile indication to a surgeon that the anvil retainer has been advanced to a third position between the first advanced position and the second retracted position and wherein the anvil assembly is not locked to the anvil retainer assembly at the third position.
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Accused Products
Abstract
A surgical stapling device is disclosed for performing circular anastomoses. The surgical stapling device includes a handle portion, an elongated body portion and a head portion including an anvil assembly and a shell assembly. The head portion includes an anvil assembly including a tiltable anvil which will tilt automatically after the device has been fired and unapproximated. The tiltable anvil provides a reduced anvil profile to reduce trauma during removal of the device after the anastomoses procedure has been performed. The stapling device includes an approximation mechanism including a rotatable knob, a screw having a helical channel and an anvil retainer. The helical channel includes a dwell portion for providing a tactile indication to a surgeon that the anvil retainer has been advanced to a position wherein the anvil assembly can be removed from the anvil retainer. A removable trocar for attachment to the anvil assembly is also disclosed which includes a rib positioned proximally of a mounting projection. The rib is positioned to align the mounting projection with associated engagement structure of the anvil assembly.
151 Citations
14 Claims
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1. A surgical stapling device comprising:
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a handle portion;
a body portion;
a head portion including an anvil assembly and a shell assembly;
an approximation mechanism including an approximation knob, a drive screw and an anvil retainer, the anvil retainer being operably connected to the drive screw, the drive screw including a helical channel having a first pitch, wherein the approximation knob is operably connected to a pin which is positioned within the helical channel such that rotation of the approximation knob effects linear movement of the anvil retainer between a first advanced position and a second retracted position;
wherein the anvil assembly includes an anvil center rod configured to releasably engage the anvil retainer, the approximation mechanism being operable to retract engaged portions of the anvil center rod and the anvil retainer within the shell assembly to lock the anvil center rod to the anvil retainer; and
wherein the helical channel of the screw includes a dwell portion, the dwell portion of the helical channel having a second pitch which is smaller than the first pitch, the dwell portion being positioned along the helical channel to provide a tactile indication to a surgeon that the anvil retainer has been advanced to a third position between the first advanced position and the second retracted position and wherein the anvil assembly is not locked to the anvil retainer assembly at the third position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 14)
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10. A removable trocar comprising:
a body having a proximal end and a distal end, a trocar tip formed at the distal end of the body, a cantilevered arm extending along a longitudinal axis of the body, the cantilevered arm including a distal end secured to the body and a proximal end having a protrusion formed thereon, the protrusion being dimensioned to be releasably received within an opening of an anvil center rod, and a rib extending proximally of the protrusion, the rib being dimensioned to slide between flexible arms of an anvil center rod to properly align the projection with the opening of the anvil center rod. - View Dependent Claims (11, 12, 13)
Specification