University of Washington

Katheryn J Allyn

Joan E Sanders

Brian Otis

Kirk Watson Beach

John Cagle

Timothy Myers

Brian Hafner

Ellen L Lee

Daniel C Abrahamson

Santosh Zachariah

Daniel S Harrison

Michael R Severance

Systems, methods, and software are provided for assessing manufacturing errors of a prosthetic socket to facilitate a clinical assessment of the socket. The embodiments disclosed herein may align and compare a manufactured socket shape to a desired socket shape to determine whether clinically significant errors are present in the manufactured socket. A mean radial error (MRE) may be calculated and compared to a set threshold. If the MRE falls below the threshold an interquartile range (IQR) may be calculated and compared to an IQR threshold. If the IQR falls below the IQR threshold, surface normal angle errors (SNAE) may be calculated and plotted to the surface model. If the SNAE plot does not include closed contour regions, the socket may proceed to patient fitting. If the MRE or IQR thresholds are exceeded, or if the SNAE plot indicates closed contour regions, the socket may be reshaped accordingly, prior to fitting.

System to evaluate prosthetic sockets

A prosthetic sock monitoring system is disclosed. The sock monitoring system includes a storage device and a data collection unit. The data collection unit is operable to receive data from at least one sensor coupled to a prosthetic sock that is wearable by a patient, and store the received data in the storage device. A prosthetic sock is also disclosed. The sock comprises material shaped to fit over at least a portion of the residual limb of the patient and a thickness adapted for inserting the residual limb into the socket of the prosthesis while the sock is fitted over the residual limb. The sock also comprises one or more of a sock identification unit and a force sensing device.

Limb volume accommodation in people with limb amputation

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.

Measurement and use of in-socket residual limb volume change data for prosthetic fitting

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Seattle, WA, United States of America

Katheryn J Allyn