Patent attributes
A surgical stapler. The surgical stapler includes a drive system, an electric motor, a battery and a control system. The electric motor is mechanically coupled to the drive system. The battery is electrically couplable to the electric motor. The control system is electrically connected to the electric motor and includes an H-bridge circuit and a temperature sensing device. The H-bridge circuit includes a high side and a low side. The low side of the H-bridge circuit includes first and second switching devices, and a resistive heating element electrically connected in series with the first switching device. The temperature sensing device is positioned proximate the resistive heating element. The control system is configured to control a force applied to the drive system based on a temperature associated with the resistive heating element and sensed by the temperature sensing device.
