Surgical stapler having current mirror-based motor control

  • US 10,076,326 B2
  • Filed: 09/23/2015
  • Issued: 09/18/2018
  • Est. Priority Date: 09/23/2015
  • Status: Active Grant
First Claim
Patent Images

1. 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, the control system comprising;

    an H-bridge circuit comprising a plurality of switching devices; and

    a current mirror circuit electrically connected to the H-bridge circuit, wherein the control system is configured to control a force applied to the drive system based on a current measured at a node of the current mirror circuit, and wherein the node is electrically connected in parallel with the H-bridge circuit.

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