Sergiu I Silvian

US Patent:

6400990, Jun 4, 2002

Filed:

Feb 18, 2000

Appl. No.:

09/507171

Inventors:

Sergiu Silvian - La Crescenta CA

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 102

US Classification:

607 60, 607 30, 607 31, 607 32

Abstract:

A dual-mode telemetry system that allows digital binary data to be efficiently transferred between an implantable device and a patient control unit. The patient control unit utilizes a bidirectional, asymmetric, telemetry link, wherein in a first mode, the patient control unit transmits data at a high bit rate to the implanted device, and in a second mode, the patient control unit receives data at a low bit rate from the implanted device. The telemetry system is relatively simple and inexpensive to construct, and requires minimal modifications to the implanted device.

US Patent:

6477414, Nov 5, 2002

Filed:

Apr 26, 2001

Appl. No.:

09/844035

Inventors:

Sergiu Silvian - La Crescenta CA

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 139

US Classification:

607 5

Abstract:

The transformer assembly is coupled between a power supply and a pulse delivery circuit of the implantable cardiac stimulation device for charging a pair of defibrillation capacitors for delivering defibrillation pulses. The power transformer assembly is formed from a printed circuit board (PCB) having a set of transformer coil turns embedded therein and a transformer core mounted adjacent to the windings of the PCB. By embedding the coil of the transformer within the PCB, the transformer may be more easily integrated with other components of the stimulation device so that the overall size of the stimulation device may be reduced. Moreover, the use of a PCB helps avoid reliability problems that might otherwise occur in the fabrication, assembly and operation of the device. In one specific configuration described herein, the transformer assembly includes a primary and two secondary transformers. The primary transformer is used as a flyback transformer for charging the pair of defibrillation capacitors.

US Patent:

6522920, Feb 18, 2003

Filed:

Dec 11, 2000

Appl. No.:

09/735168

Inventors:

Sergiu Silvian - La Crescenta CA
Wayne A. Morgan - Northridge CA

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 108

US Classification:

607 2, 607 4, 607 30, 607 32

Abstract:

A protection device for use in an implantable medical device such as an ICD that communicates with an external programmer. The protection device includes one or more control blocks that inhibit gate triggers for the switching elements (IGBTs) of an H-bridge whenever the drive voltage for these switching elements falls below a pre-determined level. Each control block provides a controlled path to charge the IGBT gate when triggering is required and, importantly, when the gate drive voltage is above a predetermined threshold. The control block further prevents inadvertent or spurious triggering and protects the gate circuitry of the switching elements by providing a low impedance path between the gates and sources of the IGBTs when the latter switching elements are intended to be turned OFF. Additionally, the control blocks protect the IGBTs from over-voltage effects by clamping the output of the gate trigger with a shunt regulator circuit.

US Patent:

6577898, Jun 10, 2003

Filed:

Apr 26, 2001

Appl. No.:

09/844190

Inventors:

Sergiu Silvian - La Crescenta CA

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 136

US Classification:

607 32, 607 60

Abstract:

A bi-directional telemetry system includes an implanted unit that allows a high-speed transfer of digital data with minimal complexity of the electronic circuitry. A corresponding external unit is capable of decoding the high-data-rate transmitted information and, in turn, communicates with the implanted unit using pulse amplitude modulation. The data transmission rate of the implanted unit to the external device is 32 kbps, a four-fold increase over conventional data transmission rates, without increasing the carrier frequency. To this end, the implanted unit using a modified implementation of the quadrature amplitude modulation (QAM) method that generates the required symbols from readily available squarewave signals. Simulated sinewaves are generated within the transmitter by an inverting amplifier stage with variable input resistance determined by a pair of switches that are ultimately controlled by 16 k and 32 k clocks in the implanted unit. Data is encoded by changing the amplitude and polarity of the simulated sinewaves.

US Patent:

6577900, Jun 10, 2003

Filed:

May 29, 2001

Appl. No.:

09/870340

Inventors:

Sergiu Silvian - La Crescenta CA

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 108

US Classification:

607 60, 607 32

Abstract:

A telemetry system for use in an implantable device that communicates with an external programmer, includes a coil, a timing circuit connected to the coil, and a coil driver circuit that reverts at least part of the expanded energy back to the power source. The timing circuit generates two control signals SC and SC , and is comprised of four switches S , S , S , S that are connected across the power source and the coil, and that are selectively energized by the control signals SC and SC. The control signal SC energizes switches S and S to close, with the switches S and S open, causing the coil to become a load across the power source and to store energy therefrom. Upon the expiration of the control signal SC , the control signal SC triggers switches S and S to close with the switches S and S open, causing the coil to discharge the stored energy through the power source, charging it.

US Patent:

6968231, Nov 22, 2005

Filed:

Jan 18, 2002

Appl. No.:

10/052812

Inventors:

Sergiu Silvian - La Crescenta CA, US
Gabriel A. Mouchawar - Valencia CA, US

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N001/378

US Classification:

607 12, 607 4

Abstract:

A high voltage converter circuit for an implantable cardiac device. The circuit includes a plurality of transistors that are connected in parallel to a battery and the primary winding of a transformer. A switching element is connected to the circuit so as to periodically connect and disconnect the capacitors to the primary winding of the transformer to thereby induce the capacitors to be charged and periodically discharged across the transformer into charging capacitors. A circuit also preferably includes a disconnect circuit that will disconnect the capacitors from the battery during periods of non-use to inhibit unwanted dissipation of the battery's energy.

US Patent:

7136703, Nov 14, 2006

Filed:

Apr 16, 2002

Appl. No.:

10/123944

Inventors:

Armando M. Cappa - Granada Hills CA, US
Sergiu Silvian - La Crescenta CA, US
Paul A. Levine - Santa Clarita CA, US

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 1/362

US Classification:

607 9, 607 30

Abstract:

A programmer for implantable stimulation devices and surface ECG system in wireless communication with each other. A self-powered ECG monitor with conventional surface electrodes transceives signals from and to a programmer provided with a radio frequency transceiver to eliminate hardwiring between the surface electrodes and the programmer. The system reduces the need for supply line frequency filtering and isolation circuitry to protect against high voltage defibrillation shocks.

US Patent:

8209005, Jun 26, 2012

Filed:

Oct 31, 2006

Appl. No.:

11/555183

Inventors:

J. Christopher Moulder - Encino CA, US
George I. Isaac - Port Hueneme CA, US
Sergiu Silvian - Los Angeles CA, US

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61B 5/05

US Classification:

600547, 607 14, 607 17

Abstract:

Constant voltage or current is applied to high-voltage leads to determine impedance across medical device leads. Thyristors are used for upper switching components in an H-bridge. Current is sourced into a thyristor's gate from a ground-referenced source. This current then passes from the gate to the cathode and out to the patient. By keeping the current sufficiently low, the thyristors will not conduct from the anode to the cathode. Current passes through the thyristor, lead and patient and is sensed as it returns from the other lead. The sensed current is used to regulate the injected current. Pulses of constant current on the order of tens of milliamperes can be injected and the resulting voltage can be measured. Alternatively, a constant voltage can be applied and the resulting current can be measured to determine lead impedance.