Power Console For A Surgical Tool That Includes A Transformer With An Integrated Current Source For Producing A Matched Current To Offset The Parasitic Current
AssigneeStryker Corporation
InventorAdam Darwin Downey
Life of this patent
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Abstract
Control console for a powered surgical tool that includes a transformer with a secondary winding across which the tool drive signal is present. Also internal to the transformer is a matched current source that consists of a leakage control winding and a capacitor. The current sourced by the matched current at least partially cancels out leakage current that may be present.
Claims20
A powered surgical tool system comprising:
- a surgical tool including a power generating unit;
- a control console for supplying a drive signal to the power generating unit of the surgical tool, the control console including:
- a transformer with a primary winding across which an AC voltage is applied and a secondary winding across which a drive signal is induced so the drive signal can be applied to the power generating unit of the surgical tool, and
- a matched current source connected to the secondary winding and configured to produce a current that at least partially cancels a leakage current present in the drive signal as a result of parasitic capacitance;
- a high side conductor and a low side conductor each connected to a different end of the secondary winding and the power generating unit of the surgical tool for applying the drive signal induced across the secondary winding to the power generating unit of the surgical tool;
- and
- a cable connected to the control console and the surgical tool, the cable including a portion of the high side conductor, a portion of the low side conductor, and an internal shield through which the portion of the high side conductor extends, wherein the low side conductor is electrically coupled to the internal shield.
A powered surgical tool assembly for use with a control console for supplying a drive signal to the powered surgical tool assembly, the control console including a transformer with a primary winding across which an AC voltage is applied and a secondary winding across which a drive signal is induced so the drive signal can be applied to the powered surgical tool assembly, the powered surgical tool assembly comprising:
- a surgical tool including a power generating unit;
- a high side conductor and a low side conductor each connected to the power generating unit of the surgical tool for applying the drive signal induced across the secondary winding to the power generating unit of the surgical tool;
- and
- a cable connected to the surgical tool and including a portion of the high side conductor, a portion of the low side conductor, and an internal shield through which the portion of the high side conductor extends,
- wherein the low side conductor is electrically coupled to the internal shield, and
- wherein the cable is removably connectable to the control console for removably connecting each of the high side conductor and the low side conductor to a different end of the secondary winding.
A transformer for supplying a drive signal to a power generating unit of a surgical tool, the transformer comprising:
- a primary winding for receiving an AC voltage;
- a secondary winding for inducing the drive signal applied to the power generating unit of the surgical tool;
- and
- a leakage control winding across which the AC voltage that is present across the primary winding induces a voltage for producing a current that at least partially cancels a leakage current present in the drive signal as a result of parasitic capacitance, the leakage control winding being located outwardly of the primary and secondary windings.
Dependencies are inferred from the claim text.