Richard D Powers

US Patent:

7492144, Feb 17, 2009

Filed:

Sep 6, 2006

Appl. No.:

11/470465

Inventors:

Richard Powers - Atlanta GA, US
Michael G. Ellis - Alpharetta GA, US
Jason Kroh - Villa Rica GA, US
Donald J. Miller - Roswell GA, US

Assignee:

CardioMEMS, Inc. - Atlanta GA

International Classification:

G01R 23/12

US Classification:

324 7652, 324 7653

Abstract:

The present invention determines the resonant frequency of a wireless sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency. The system receives the ring down response of the sensor and determines the resonant frequency of the sensor, which is used to calculate a physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal. The system identifies false locks by detecting an unwanted beat frequency in the coupled signal, as well as determining whether the coupled signal exhibits pulsatile characteristics that correspond to a periodic physiological characteristic, such as blood pressure.

US Patent:

7710103, May 4, 2010

Filed:

Jan 7, 2009

Appl. No.:

12/350173

Inventors:

Richard Powers - Atlanta GA, US
Michael G. Ellis - Alpharetta GA, US
Jason Kroh - Villa Rica GA, US
Donald J. Miller - Roswell GA, US

Assignee:

CardioMEMS, Inc. - Atlanta GA

International Classification:

G01R 23/12

US Classification:

324 7652, 324 7653

Abstract:

The present invention determines the resonant frequency of a wireless sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency. The system receives the ring down response of the sensor and determines the resonant frequency of the sensor, which is used to calculate a physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal. The system identifies false locks by detecting an unwanted beat frequency in the coupled signal, as well as determining whether the coupled signal exhibits pulsatile characteristics that correspond to a periodic physiological characteristic, such as blood pressure.

US Patent:

56403887, Jun 17, 1997

Filed:

Dec 21, 1995

Appl. No.:

8/576637

Inventors:

Douglas F. Woodhead - Lawrenceville GA
Maynard D. Hammond - Lawrenceville GA
Richard A. Powers - Cumming GA
Paul Rimas Zalkauskas - Cumming GA

Assignee:

Scientific-Atlanta, Inc. - Norcross GA

International Classification:

H04L 1256

US Classification:

370468

Abstract:

In a system that transmits packets containing timestamps and information from a transmission site to a reception site at a transmission bit rate the packets may experience jitter, i. e. variable delay, during transmission. In such a case, the packets are temporally shifted relative to the timestamps and to other packets. Where the timestamp values are inserted into selected packets prior to transmission and that timestamp represent the value of the transmission site clock, the method and apparatus of the present invention substantially removes the jitter and adjusts the timestamp values prior to reception of the packets at the reception site. The present invention achieves this goal by receiving the packets at an intermediate site that has a local clock operates at a nominal frequency substantially equal to the nominal frequency of the transmission site clock and uses that clock as a jitter-free clock to correct the packets. The packets are stored in a buffer at the intermediate site and output from the buffer at a controlled rate to maintain a substantially constant average transit time of packets through the buffer. Before the packets are output for reception at the reception site the timestamps of selected packets are modified to reflect the new temporal relationship between packets due to the controlled rate of output from the intermediate site.

US Patent:

20220378377, Dec 1, 2022

Filed:

Mar 28, 2022

Appl. No.:

17/705585

Inventors:

- Philadelphia PA, US
Richard Michael Powers - Smyrna GA, US
Jason Mark Kroh - Locust Grove GA, US
Nicholas Shane Delmonico - Wilmington DE, US

Assignee:

Strados Labs, Inc. - Philadelphia PA

International Classification:

A61B 5/00
A61B 5/08
G06N 20/00
G16H 10/60

Abstract:

In various embodiments, a system for cleaning, marking, and/or interpreting physiological data is disclosed. The system includes a memory having instructions stored thereon, and a processor configured to read the instructions to: receive a training data set comprising physiological data including labeled events corresponding to a predetermined portion of the physiological data, generate a trained artificial intelligence (AI) model configured to identify events within device data, and identify at least one physiological event within a target device data set based on the trained AI model. The trained AI model is generated using an iterative training process based on the training data set.