Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Reexamination Certificate
2006-05-30
2006-05-30
Manuel, George (Department: 3762)
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
C607S011000
Reexamination Certificate
active
07054688
ABSTRACT:
A heart stimulator has a pulse generator which emits stimulation pulses of different amplitudes, which are delivered to a patient's heart via a lead connected to the pulse generator. The pulse generator is controlled by a control unit, in a procedure for determining a stimulation threshold value, to emit stimulation pulses of successively unidirectionally changing amplitudes. Each stimulation pulse is followed by a test pulse having a predetermined high, constant amplitude delivered in a period corresponding to the refractory period after the preceding stimulation pulse. Each test pulse has an amplitude sufficient to capture a non-refractory heart. A measurement unit is connected to the electrode lead, and measures a signal picked up by the lead after each test pulse. The measured signals are supplied to a comparator, which compares the signals following the test pulses with each other. A significant change in the measured signal after the test pulses indicates that the amplitude of the stimulation pulses has passed the threshold value.
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Andersson Peter
Budgifvars Goran
Larsson Berit
Shojaei Feresteh
Uhrenius Åsa
Kramer Nicole R.
Manuel George
Schiff & Hardin LLP
St. Jude Medical AB
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