Impedance matching circuit
First Claim
Patent Images
1. A thermal surgical instrument comprising:
- a thermal element configured to generate thermal energy in response to an electrical signal, the thermal element comprising a ferromagnetic material disposed on an electrical conductor; and
a matching circuit electrically connected to the thermal element;
wherein the matching circuit, in combination with the thermal element, has an input impedance.
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Abstract
An impedance matching circuit may be used to adjust for manufacturing and design tolerances in a surgical instrument. The matching circuit may match the load of a thermal element with the impedance of a power source used to deliver electrical energy to the surgical instrument. The matching circuit may include capacitors, inductors, coaxial cables, varactors, transformers, resistors, and/or combinations thereof. The matching circuit may also comprise a circuit board or flex board layers which may be modified to adjust the impedance of the load.
302 Citations
21 Claims
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1. A thermal surgical instrument comprising:
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a thermal element configured to generate thermal energy in response to an electrical signal, the thermal element comprising a ferromagnetic material disposed on an electrical conductor; and a matching circuit electrically connected to the thermal element; wherein the matching circuit, in combination with the thermal element, has an input impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A thermal surgical instrument comprising:
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a thermal element configured to generate thermal energy in response to an electrical signal; and a matching circuit electrically connected to the thermal element; wherein the matching circuit, in combination with the thermal element, has an input impedance; and wherein the matching circuit further comprises a conductive layer disposed on a substrate, wherein at least a portion of the conductive layer is removable.
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11. A method of matching an input impedance of a load of a thermal surgical instrument with an output impedance of a power source comprising the steps of:
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selecting a thermal surgical tool having a thermal element and a circuit board; disposing a component on the circuit board to form a matching circuit; wherein the thermal element and the matching circuit comprise a load having an adjustable input impedance. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a thermal surgical instrument comprising the steps of:
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selecting a surgical instrument comprising a thermal element; disposing a matching circuit in electrical communication with the thermal element such that the matching circuit, in combination with the thermal element, has an input impedance and wherein the matching circuit comprises a conductive layer; and adjusting the input impedance by removing at least a portion of the conductive layer so that it matches an output impedance of a power source. - View Dependent Claims (19, 20)
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21. A thermal surgical tool comprising:
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a thermal element; a circuit board having a component disposed thereon to form a matching circuit; and wherein the thermal element and the matching circuit comprise a load having an adjustable input impedance.
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Specification