Patent RU-2640947-C2 (RU)
Title: Surgical stapler with locking system to prevent activation in absence of installed staple cartridge
Inventor: LEJMBAKH RICHARD L
IPC: A61B17/072
Filed: 2013-03-14
Granted: 2018-01-12
Abstract: FIELD: medicine. 
     SUBSTANCE: surgical stapler includes an end effector including an elongated channel, an abutment, and an abutment blocking member. The elongated channel is designed to functionally support a surgical staple cartridge. The abutment is supported on the elongated channel with an ability to move between an open and closed position in response to the application of opening and closing movements thereto. The abutment blocking member interacts with the abutment to keep the stop in the open position when the staple cartridge is not installed in the elongated channel, and prevents the abutment movement to the closed position until the staple cartridge is installed in the elongated channel. The abutment comprises a mounting portion of the abutment supported rotatably on the elongated channel, and the blocking member of the abutment is biased to contact the mounting portion of the abutment. The mounting portion of the abutment further comprises a pair of opposing abutment shoes adapted to be moved into the respective shoe slots in the elongated channel. Each abutment shoe slot contains a blocking slot to receive the appropriate abutment shoe when the surgical staple cartridge is not installed in the elongated channel, and an arc slot segment to receive the appropriate abutment shoe when the cartridge is installed in the elongated channel, so that the abutment shoe can move in the arc slot segment when closing movement is applied to the abutment. In the second embodiment, the surgical stapler comprises a handle, an elongated rod assembly, a closure system, an elongated channel and a surgical staple cartridge. The elongated rod assembly is functionally connected to the handle. The closing system is functionally supported on the handle to generate closing and opening movement in response to activation of the closing trigger mechanism, functionally supported on the handle. The elongated channel is connected to the elongated rod assembly. The abutment includes a mounting portion of the abutment supported on the elongated channel, with an ability to move between open and closed positions in response to communication of opening and closing motions by means of the elongated rod assembly. The abutment blocking member is functionally supported by the elongated rod assembly for movable engagement with the mounting portion of the abutment. The surgical staple cartridge is designed for placement in the elongated channel and interaction with the mounting portion. When the surgical staple cartridge is not located inside the elongated channel, the abutment blocking member interacts with the mounting portion of the abutment to hold the abutment in the open position. When surgical staple cartridge is installed inside the elongated channel, the staple cartridge moves the mounting portion of the abutment to the position where the abutment can be closed when affected by closing movements. At that, the mounting portion of the abutment further comprises a pair of opposing abutment shoes adapted to be moved into the respective shoe slots in the elongated channel. 
     EFFECT: application of the invention allows to prevent activation in the absence of the installed staple cartridge. 
     13 cl, 41 dwg