Surgical stapler having motor control based on an electrical parameter related to a motor current
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 high side and a low side, wherein the low side of the H-bridge circuit comprises first and second switching devices;
an electrically resistive element electrically connected in series with the first switching device; and
an electrically inductive element electrically connected to the electrically resistive element, wherein the control system is configured to control a force applied to the drive system based on a current downstream of the electrically resistive element.
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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, an electrically resistive element and an electrically inductive element. 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. The electrically resistive element is electrically connected in series with the first switching device. The electrically inductive element is electrically connected to the electrically resistive element. The control system is configured to control a force applied to the drive system based on a current downstream of the electrically resistive element.
5772 Citations
23 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 high side and a low side, wherein the low side of the H-bridge circuit comprises first and second switching devices; an electrically resistive element electrically connected in series with the first switching device; and an electrically inductive element electrically connected to the electrically resistive element, wherein the control system is configured to control a force applied to the drive system based on a current downstream of the electrically resistive element. - 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 electric motor, the control system comprising; 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; an electrically inductive element electrically connected in series with the first switching device; and a filter magnetically coupled to the electrically inductive element, wherein the control system is configured to control a force applied to the drive system based on a current in the filter. - View Dependent Claims (11, 12, 13, 14, 15)
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16. 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, wherein the control system comprises a pulse width modulation circuit and is configured to control a force applied to the drive system based on; a plurality of battery current measurements taken while a pulse signal generated by the pulse width modulation circuit is above a baseline value; and a plurality of predicted recirculating current values, wherein the predicted recirculating current values are based on at least one of the plurality of battery current measurements. - View Dependent Claims (17, 18, 19, 20, 21)
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22. 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, wherein the control system comprises a pulse width modulation circuit and is configured to control a force applied to the drive system based on; a battery current measurement taken while a pulse signal generated by the pulse width modulation circuit is above a baseline value; and a state of a duty cycle associated with the pulse width modulation circuit. - View Dependent Claims (23)
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Specification