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
Estimating the term…
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.
Claims21
A control console for supplying a drive signal to the power generating unit of a surgical tool, said 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 comprising a leakage control winding across which the AC voltage that is present across the primary winding induces a voltage and a capacitor connected between the leakage control winding and the transformer secondary winding, the matched current source designed to produce a current that at least partially cancels a leakage current present in the drive signal as a result of parasitic capacitance,
- wherein both the leakage control winding and the capacitor of the matched current source are internal to the transformer.
A transformer for supplying a drive signal to a power generating unit of a surgical tool, the transformer including:
- 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 matched current source comprising a leakage control winding across which the AC voltage that is present across the primary winding induces a voltage and a capacitor connected between the leakage control winding and the transformer secondary winding, the matched current source designed to produce a current that at least partially cancels a leakage current present in the drive signal as a result of parasitic capacitance,
- wherein a set of turns of one of the windings of the transformer functions as a plate of the matched current source capacitor.
A transformer for supplying a drive signal to a power generating unit of a surgical tool, the transformer including:
- 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, the secondary winding including a high side end and a low side end for supplying the drive signal to the power generating unit of the surgical tool;
- a leakage control winding across which the AC voltage that is present across the primary winding is configured to induce 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;
- and
- a layer of conductive material connected to the low side end of the secondary winding and wrapped around the primary winding, secondary winding, and the leakage control winding so as to function as an electromagnetic shield.
Dependencies are inferred from the claim text.