Surgical stapler having current mirror-based motor control
First Claim
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.
3 Assignments
0 Petitions
Accused Products
Abstract
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 current mirror circuit. The H-bridge circuit includes a plurality of switching devices. The current mirror circuit is electrically connected to the H-bridge circuit. 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. The node is electrically connected in parallel with the H-bridge circuit.
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Citations
21 Claims
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1. A surgical stapler, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A surgical stapler, comprising:
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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 electrical motor, the control system comprising; an H-bridge circuit comprising a plurality of switching devices; a first current mirror circuit electrically connected to the H-bridge circuit; and a second current mirror circuit electrically connected to the H-bridge circuit, wherein the control system is configured to; control a first force applied to the drive system based on a first current measured at a node of the first current mirror circuit, wherein the node is electrically connected in parallel with the H-bridge circuit; and control a second force applied to the drive system based on a second current measured at a node of the second current mirror circuit, wherein the node of the second current mirror circuit is electrically connected in parallel with the H-bridge circuit. - View Dependent Claims (11, 12, 13, 14)
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15. A surgical stapler, comprising:
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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; a mirror bridge circuit, comprising; an H-bridge circuit, the H-bridge circuit comprising; a plurality of switching devices; and a current mirror circuit electrically connected in series with the electric motor, 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 external to the H-bridge circuit. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A surgical stapler, comprising:
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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 an electrical circuit electrically connected to the H-bridge circuit, wherein the control system is configured to control the electric motor based on a current measured in the electrical circuit.
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Specification