SURGICAL STAPLING TOOL WITH ENGINE CONTROL BASED ON ELECTRICAL PARAMETER ASSOCIATED WITH MOTOR CURRENT Russian patent published in 2020 - IPC A61B17/68 H02P7/28 

FIELD: medical equipment.

SUBSTANCE: group of inventions relates to surgical stapling tools. Proposed tool comprises drive system, electric motor, battery and control system. Engine is mechanically connected with drive system. Battery is electrically connected to the electric motor. Control system comprises circuit H-bridge, electrically resistive element and electrically inductive element. H-bridge circuit comprises a high side and a low side. Low side of the circuit has first and second switching devices. Resistive element is electrically connected in series with the first switching device. Inductive element is connected in parallel to the resistive element. Resistive and inductive elements are electrically connected to one of the arms of the H-bridge circuit. Control system is electrically connected to motor and is configured to control force applied to drive system based on current after electrically resistive element. In compliance with another version, instrument comprises filter magnetically coupled with electrically inductive element. Control system is configured to control the force applied to the drive system based on the current in the filter. In another version, the control system of the control system comprises a pulse width modulation circuit and is configured to control the force applied to the drive system, based on measurements of storage battery current and predicted values of recirculation current. Current of the accumulator battery is measured at the time when the pulse signal generated by the pulse modulation circuit exceeds the initial value. Predicted values of recirculation current are based on measurement of accumulator battery current. In another version, the tool control system comprises a pulse width modulation circuit and is configured to control the force applied to the drive system, based on measurement of accumulator battery current and operating cycle state associated with pulse-width modulation scheme.

EFFECT: surgical stapling instrument is provided to control the force applied to the drive by means of a control system.

20 cl, 34 dwg