Ellen Lai Lee

US Patent:

8142369, Mar 27, 2012

Filed:

Jul 27, 2009

Appl. No.:

12/509934

Inventors:

Joan E. Sanders - Sammamish WA, US
Timothy R. Myers - Seattle WA, US
Daniel S. Harrison - Kirkland WA, US
Katheryn J. Allyn - Seattle WA, US
Ellen L. Lee - Corvallis OR, US
Daniel C. Abrahamson - Seattle WA, US
Kirk Beach - Seattle WA, US
Santosh Zachariah - Seattle WA, US

Assignee:

University of Washington - Seattle WA

International Classification:

A61B 5/1477

US Classification:

600587, 607148, 600382, 600456

Abstract:

Changes in the volume of residual limbs on which prosthetic sockets are worn can be measured based on bioimpedance measurements along one or more segments of the limb. A current at an appropriate frequency (e. g. , in the range from 1 kHz to 1 MHz) is injected at two current electrodes that contact the skin of the residual limb. The voltage at the voltage electrodes disposed between the current electrodes is measured and using an appropriate model, the change in the segmented volume of the limb can be determined during periods of different activity and at different times during the day. This information can be used for assessing the fit of the socket and can also provide a feedback signal for automatically controlling volume management devices, to ensure a more comfortable fit when the volume of the limb is changing.

US Patent:

8423167, Apr 16, 2013

Filed:

Jul 22, 2009

Appl. No.:

12/507560

Inventors:

Joan E. Sanders - Sammamish WA, US
Michael R. Severance - Seattle WA, US
Timothy R. Myers - Seattle WA, US
George Turkiyyah - Seattle WA, US
Elizabeth A. Sorenson - Ramona CA, US
Ellen L. Lee - Corvallis OR, US

Assignee:

University of Washington - Seattle WA

International Classification:

G06F 17/50
G06F 19/00

US Classification:

700 98, 700118, 700161, 700195, 623901, 703 1

Abstract:

For use in connection with evaluating prosthetic sockets (and other objects) designed and fabricated with computer aided design and manufacturing software, the shape of a socket is accurately scanned and digitized. The scanned data are then compared to either an electronic shape data file, or to the shape of another socket, a positive model of a residual limb (or socket), or a residual limb. Differences detected during the comparison can then be applied to revise the design or fabrication of the socket, to more accurately achieve a desired shape that properly fits the residual limb of a patient and can be used to solve the inverse problem by correcting for observed errors of a specific fabricator before a socket is produced. The digitizing process is implemented using a stylus ball that contacts a surface of the socket to produce data indicating the three-dimensional shape of the socket.

US Patent:

20120143077, Jun 7, 2012

Filed:

Jan 27, 2012

Appl. No.:

13/360525

Inventors:

Joan E. Sanders - Sammamish WA, US
Timothy R. Myers - Seattle WA, US
Daniel S. Harrison - Kirkland WA, US
Katheryn J. Allyn - Seattle WA, US
Ellen L. Lee - Corvallis OR, US
Daniel C. Abrahamson - Seattle WA, US
Kirk Beach - Seattle WA, US
Santosh Zachariah - Seattle WA, US

Assignee:

UNIVERSITY OF WASHINGTON - Seattle WA

International Classification:

A61B 5/053

US Classification:

600547

Abstract:

Changes in the volume of residual limbs on which prosthetic sockets are worn can be measured based on bioimpedance measurements along one or more segments of the limb. A current at an appropriate frequency (e.g., in the range from 1 kHz to 1 MHz) is injected at two current electrodes that contact the skin of the residual limb. The voltage at the voltage electrodes disposed between the current electrodes is measured and using an appropriate model, the change in the segmented volume of the limb can be determined during periods of different activity and at different times during the day. This information can be used for assessing the fit of the socket and can also provide a feedback signal for automatically controlling volume management devices, to ensure a more comfortable fit when the volume of the limb is changing.