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, wherein in the third position, the engaged portions of the anvil center rod and anvil retainer have been advanced from the shell assembly to a position to unlock the anvil center rod and the anvil retainer.
4 Assignments
0 Petitions
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.
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Citations
20 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, wherein in the third position, the engaged portions of the anvil center rod and anvil retainer have been advanced from the shell assembly to a position to unlock the anvil center rod and the anvil retainer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surgical stapling device comprising:
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a handle portion; a body portion having a proximal end and a distal end; a head portion including an anvil assembly and a shell assembly; and 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 portion defining a first pitch and a dwell portion defining a second smaller pitch, the dwell portion being positioned proximally of the first portion of the helical channel, 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 to move the anvil assembly. - View Dependent Claims (11, 12, 13, 14)
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15. An approximation mechanism for a surgical stapling device, the approximation mechanism comprising:
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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 portion 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, the anvil retainer being releasably connected to a center rod of an anvil assembly, the approximation mechanism being operable to retract engaged portions of the anvil center rod and the anvil retainer into a housing of a surgical stapling device 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 such that actuation of the approximation member does not cause substantial linear movement of the anvil retainer when the pin is positioned in the dwell portion, the dwell portion being positioned along the helical channel proximally of the first portion 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. - View Dependent Claims (16, 17)
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18. A method of approximating an anvil of a surgical stapling device, the method comprising the following steps:
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i) providing a surgical stapling device having an approximation mechanism including an anvil retainer and a tactile indicator associated with the approximation mechanism, the tactile indicator indicating to the surgeon that the anvil retainer of the surgical stapling device has been moved to an intermediate position between an advanced position and a retracted position with respect to a stapling head of the instrument; ii) inserting a distal portion of the surgical device into a body lumen; iii) performing a surgical stapling procedure; iv) rotating the approximation knob to move the anvil retainer from the retracted position towards the advanced position, wherein the tactile indicator is positioned on the approximation mechanism to provide an indication to a surgeon of one of the following conditions; a) the anvil retainer has been moved towards the advanced position a sufficient distance to permit pivoting of an anvil head of an anvil assembly supported on the anvil retainer; and b) the anvil retainer has been moved towards the advanced position a sufficient distance to unlock the anvil assembly from the anvil retainer to facilitate removal of the anvil assembly from the anvil retainer; and v) removing the surgical stapling device from the body lumen when the anvil retainer has been moved to the intermediate position. - View Dependent Claims (19, 20)
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Specification