Kiran Nimmagadda

US Patent:

7539538, May 26, 2009

Filed:

May 26, 2005

Appl. No.:

11/138632

Inventors:

Jordi Parramon - Valencia CA, US
Yuping He - Northridge CA, US
Kiran Nimmagadda - Valencia CA, US

Assignee:

Boston Science Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/00

US Classification:

607 2

Abstract:

In one embodiment, the present invention provides an implantable stimulation device that includes output current sources and/or sinks configured to provide an output current for a load (i. e. , tissue). The output path of the output current source or sink comprises a transistor which operates in a linear mode instead of a saturation mode. Because operation in a linear mode results in smaller drain-to-source voltage drops, power consumption in the output current source or sink (and hence in the implantable stimulator) is reduced, reducing battery or other power source requirements. Operation in the linear mode is facilitated in useful embodiments by a load in an input path (into which a reference current is sent) and a load in the output path (which bears the output current). The loads can be active transistors or passive resistors. A feedback circuit (e. g.

US Patent:

7881803, Feb 1, 2011

Filed:

Oct 18, 2006

Appl. No.:

11/550655

Inventors:

Jordi Parramon - Valencia CA, US
Kiran Nimmagadda - Valencia CA, US
Emanuel Feldman - Simi Valley CA, US
Yuping He - Northridge CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/40

US Classification:

607 61

Abstract:

Disclosed herein are circuits and methods for a multi-electrode implantable stimulator device incorporating one decoupling capacitor in the current path established via at least one cathode electrode and at least one anode electrode. In one embodiment, the decoupling capacitor may be hard-wired to a dedicated anode on the device. The cathodes are selectively activatable via stimulation switches. In another embodiment, any of the electrodes on the devices can be selectively activatable as an anode or cathode. In this embodiment, the decoupling capacitor is placed into the current path via selectable anode and cathode stimulation switches. Regardless of the implementation, the techniques allow for the benefits of capacitive decoupling without the need to associate decoupling capacitors with every electrode on the multi-electrode device, which saves space in the body of the device. Although of particular benefit when applied to microstimulators, the disclosed technique can be used with space-saving benefits in any stimulator device.

US Patent:

8081925, Dec 20, 2011

Filed:

May 8, 2008

Appl. No.:

12/117487

Inventors:

Jordi Parramon - Valencia CA, US
Kiran Nimmagadda - Valencia CA, US
Md Mizanur Rahman - Stevenson Ranch CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

H04B 5/00
H04M 1/00

US Classification:

455 411, 4555756

Abstract:

An improved transceiver circuit particularly useful in an inductively coupled wireless communication system such as an implantable medical device system is disclosed. The improved transceiver circuit is switchable to assume a serial L-C configuration in the transmit mode and a parallel L-C configuration in the receive mode, but does not require high voltage switches. A low-drive transmitter and a high-input-impedance receiver are used, which reduces power consumption in receive mode, while still maintaining good transmitter performance.

US Patent:

8369963, Feb 5, 2013

Filed:

Jan 24, 2011

Appl. No.:

13/012279

Inventors:

Jordi Parramon - Valencia CA, US
Kiran Nimmagadda - Valencia CA, US
Emanuel Feldman - Simi Valley CA, US
Yuping He - Northridge CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/40

US Classification:

607 61, 607 13, 607 46, 607 55, 607 56, 607 57

Abstract:

Disclosed herein are circuits and methods for a multi-electrode implantable stimulator device incorporating one decoupling capacitor in the current path established via at least one cathode electrode and at least one anode electrode. In one embodiment, the decoupling capacitor may be hard-wired to a dedicated anode on the device. The cathodes are selectively activatable via stimulation switches. In another embodiment, any of the electrodes on the devices can be selectively activatable as an anode or cathode. In this embodiment, the decoupling capacitor is placed into the current path via selectable anode and cathode stimulation switches. Regardless of the implementation, the techniques allow for the benefits of capacitive decoupling without the need to associate decoupling capacitors with every electrode on the multi-electrode device, which saves space in the body of the device. Although of particular benefit when applied to microstimulators, the disclosed technique can be used with space-saving benefits in any stimulator device.

US Patent:

8577474, Nov 5, 2013

Filed:

Nov 11, 2009

Appl. No.:

12/616178

Inventors:

Kiran Nimmagadda - Valencia CA, US
Jordi Parramon - Valencia CA, US
Emanuel Feldman - Simi Valley CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/372
A61N 1/378

US Classification:

607 60, 607 61

Abstract:

An improved implantable pulse generator (IPG) containing improved telemetry circuitry is disclosed. The IPG includes charging and telemetry coils within the IPG case, which increases their mutual inductance and potential to interfere with each other; particularly problematic is interference to the telemetry coil caused by the charging coil. To combat this, improved telemetry circuitry includes decoupling circuitry for decoupling the charging coil during periods of telemetry between the IPG and an external controller. Such decoupling circuitry can comprise use of pre-existing LSK circuitry during telemetry, or new discrete circuitry dedicated to decoupling. The decoupling circuitry is designed to prevent or at least reduce induced current flowing through the charging coil during data telemetry. The decoupling circuitry can be controlled by the microcontroller in the IPG, or can automatically decouple the charging coil at appropriate times to mitigate an induced current without instruction from the microcontroller.

US Patent:

8649858, Feb 11, 2014

Filed:

Jun 25, 2007

Appl. No.:

11/767636

Inventors:

Paul J. Griffith - Moorpark CA, US
Jordi Parramon - Valencia CA, US
Goran N. Marnfeldt - Hollviken, SE
Daniel Aghassian - Los Angeles CA, US
Kiran Nimmagadda - Valencia CA, US
Emanuel Feldman - Simi Valley CA, US
Jess W. Shi - Winnetka CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/36
A61N 1/08

US Classification:

607 4, 607 28, 607 66, 607 9, 607 59

Abstract:

An improved architecture for an implantable medical device such as an implantable pulse generator (IPG) is disclosed. In one embodiment, the various functional blocks for the IPG are incorporated into a signal integrated circuit (IC). Each of the functional blocks communicate with each other, and with other off-chip devices if necessary, via a centralized bus governed by a communication protocol. To communicate with the bus and to adhere to the protocol, each circuit block includes bus interface circuitry adherent with that protocol. Because each block complies with the protocol, any given block can easily be modified or upgraded without affecting the design of the other blocks, facilitating debugging and upgrading of the IPG circuitry. Moreover, because the centralized bus can be taken off the integrated circuit, extra circuitry can easily be added off chip to modify or add functionality to the IPG without the need for a major redesign of the main IPG IC.

US Patent:

20090204174, Aug 13, 2009

Filed:

Apr 16, 2009

Appl. No.:

12/424916

Inventors:

Jordi Parramon - Valencia CA, US
Yuping He - Northridge CA, US
Kiran Nimmagadda - Valencia CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/36

US Classification:

607 46

Abstract:

In one embodiment, the present invention provides an implantable stimulation device that includes output current sources and/or sinks configured to provide an output current for a load (i.e., tissue). The output path of the output current source or sink comprises a transistor which operates in a linear mode instead of a saturation mode. Because operation in a linear mode results in smaller drain-to-source voltage drops, power consumption in the output current source or sink (and hence in the implantable stimulator) is reduced, reducing battery or other power source requirements. Operation in the linear mode is facilitated in useful embodiments by a load in an input path (into which a reference current is sent) and a load in the output path (which bears the output current). The loads can be active transistors or passive resistors. A feedback circuit (e.g., an operational amplifier) receives voltages that build up across these loads, and sends a control signal to the gate of the transistor to ensure its linear operation.

US Patent:

20100211132, Aug 19, 2010

Filed:

Feb 17, 2009

Appl. No.:

12/372501

Inventors:

Kiran Nimmagadda - Valencia CA, US
Jordi Parramon - Valencia CA, US

Assignee:

Boston Scientific Neuromodulation Corporation - Valencia CA

International Classification:

A61N 1/08

US Classification:

607 60, 607 62

Abstract:

Improved compliance voltage generation circuitry for a medical device is disclosed. The improved circuitry in one embodiment comprises a boost converter and a charge pump, either of which is capable of generating an appropriate compliance voltage from the voltage of the battery in the device. A telemetry enable signal indicating whether the implant's transmitter, receiver, or both, have been enabled is received. A “boost” signal from compliance voltage monitor-and-adjust logic circuitry is processed with the telemetry enable signal and its inverse to selectively enable either the charge pump or the boost converter: if the telemetry enable signal is not active, the boost converter is used to generate the compliance voltage; if the telemetry enable signal is active, the charge pump is used. Because the charge pump circuitry does not produce a magnetic field, the charge pump will not interfere with magnetically-coupled telemetry between the implant and an external controller. By contrast, the boost converter is allowed to operate during periods of no telemetry, when magnetic interference is not a concern, while obtaining the advantage of higher power efficiency.