Surgical stapler having temperature-based motor control

A surgical stapler, comprising:

• a drive system;
• an electric motor mechanically coupled to the drive system;
• a battery electrically couplable to the electric motor;
• and
• a control system electrically connected to the electric motor, wherein the control system comprises:
• an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises:
• first and second switching devices;
• and
• a resistive heating element electrically connected in series with the first switching device;
• a temperature sensing device thermally coupled to the resistive heating element;
• and
• a temperature correlation system electrically coupled to the temperature sensing device, wherein the control system is configured to control a force applied to the drive system based on a current measured in the temperature correlation system.

A surgical stapler, comprising:

• a drive system;
• an electric motor mechanically coupled to the drive system;
• a battery electrically couplable to the electric motor;
• and
• a control system electrically connected to the electric motor, wherein the control system comprises:
• an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises:
• first and second switching devices;
• and
• a light emitting diode electrically connected in series with the first switching device;
• and
• a light intensity sensing device optically coupled to the light emitting diode, wherein the control system is configured to control a force applied to the drive system based on an intensity of light emitted by the light emitting diode and sensed by the light intensity sensing device.

A surgical stapler, comprising:

• a drive system;
• an electric motor mechanically coupled to the drive system;
• a battery electrically couplable to the electric motor;
• and
• a control system electrically connected to the electric motor, wherein the control system comprises:
• an H-bridge circuit comprising a high side and a low side, wherein the low side of the H-bridge circuit comprises a first leg comprising a first switching device and a second leg comprising a second switching device;
• and
• a light-emitting device electrically connected to the H-bridge circuit, wherein a parameter associated with the light-emitting device varies in relation to a current passing through the first leg of the H-bridge circuit, and wherein the control system is configured to control a force applied to the drive system based on a measurement of the parameter.