# US 5,344,429 A · Pulse routing apparatus for cardioversion and defibrillation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,344,429 A - Document ID: US5344429A - Status: Granted - Kind: A - Application number: 08/110,041 - Filed: 1993-08-20 - Granted: 1994-09-06 - Earliest claimed: 1993-08-20 - Assignees: Medtronic, Inc. - Inventors: Karel F. A. A. Smits - Web page: https://patentgrep.com/patent/US5344429A ## CPC - A61N 1/3918: {characterised by shock pathway, e.g. by electrode configuration} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract A pulse routing circuit for use in conjunction with a multiple channel defibrillator. The circuit, when coupled to a multiple channel defibrillator allows for the selection of a wide variety of multiple electrode pulse regimens and waveforms, accomplished by selective interconnection of defibrillation electrodes to the pulse routing circuit. Because the circuit employs passive switching elements, such as diodes, complex switching circuitry is not required. ## Claims ### Claim 1 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first, second and third electrodes; a steering circuit coupled to said first, second and third electrodes and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator for connecting said first, second and third electrodes to said positive and negative outputs of said first pulse generator to define a first set of electrode polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first, second and third electrodes to said positive and negative outputs of said second pulse generator to define a second set of electrode polarities different from said first set of electrode polarities. ### Claim 2 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first, second and third connector means for coupling to defibrillation electrodes; a steering circuit coupled to said first, second and third output connector means and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator by said first pulse generator for connecting said first, second and third output connector means to said positive and negative outputs of said first pulse generator to define a first set of polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first, second and third output connector means to said positive and negative outputs of said second pulse generator to define a second set of polarities different from said first set of polarities. ### Claim 3 (depends on 2) Apparatus according to claim 2, further comprising first, second and third electrodes, each said electrode provided with an electrode connector means for coupling to any of said first, second or third output connector means. ### Claim 4 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first, second, third and fourth electrodes; a steering circuit coupled to said first, second, third and fourth electrodes and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator for connecting said first, second, third and fourth electrodes to said positive and negative outputs of said first pulse generator to define a first set of electrode polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first, second, third and fourth electrodes to said positive and negative outputs of said second pulse generator to define a second set of electrode polarities different from said first set of electrode polarities. ### Claim 5 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first, second, third and fourth output connector means for coupling to defibrillation electrodes; a steering circuit coupled to said first, second, third and fourth connector means and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator for connecting said first, second and third connector means to said positive and negative outputs of said first pulse generator to define a first set of polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first, second and third connectors to said positive and negative outputs of said second pulse generator to define a second set of polarities different from said first set of polarities. ### Claim 6 (depends on 5) Apparatus according to claim 5, further comprising first, second and third electrodes, each said electrode provided with an electrode connector means for coupling to any of said first, second, third or fourth output connector means. ### Claim 7 (depends on 6) Apparatus according to claim 6 further comprising a fourth electrode provided with an electrode connector means for coupling to any of said first, second, third or fourth output connector means. ### Claim 8 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first and second electrodes; a steering circuit coupled to said first and second electrodes and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator for connecting said first and second electrodes to said positive and negative outputs of said first pulse generator to define a first set of electrode polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first and second electrodes to said positive and negative outputs of said second pulse generator to define a second set of electrode polarities different from said first set of electrode polarities. ### Claim 9 Apparatus for cardiac defibrillation, comprising: a first defibrillation pulse generator, having positive and negative outputs; a second defibrillation pulse generator, having positive and negative outputs; first and second connector means for coupling to defibrillation electrodes; a steering circuit coupled to said first and second output connector means and to said first and second pulse generators, said steering circuit comprising switching means rendered conductive by a defibrillation pulse generated by said first pulse generator for connecting said first and second output connector means to said positive and negative outputs of said first pulse generator to define a first set of polarities and rendered conductive by a defibrillation pulse generated by said second pulse generator for connecting said first and second output connector means to said positive and negative outputs of said second pulse generator to define a second set of polarities different from said first set of polarities. ### Claim 10 (depends on 2, 4, 5, 8, 9) Apparatus according to claim I or claim 2 or claim 4 or claim 5 or claim 8 or claim 9 wherein said switching means are unidirectionally conductive. ### Claim 11 (depends on 10) Apparatus according to claim 10 wherein said switching means comprise diodes.