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Assist-Knee: Energy Harvesting for Sit-to-Stand-to-Sit Transitions

Award Number: R44HD097826
ORGANIZATION: NATIONAL INSTITUTE OF CHILD HEALTH AND HUMAN DEVELOPMENT
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 04/01/2019
PERIOD OF PERFORMANCE END DATE: 06/30/2024

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Assist-Knee: Energy Harvesting for Sit-to-Stand-to-Sit Transitions - PROJECT SUMMARY This SBIR Phase II project will create and evaluate a novel low-tech Energy-Harvesting Knee Prosthesis, or Assist-Knee Prosthesis, capable of helping geriatric individuals with transfemoral limb loss more effectively and safely perform sit-to-stand-to-sit transitions. Transitioning from a sitting to a standing position is much more difficult for an individual with transfemoral limb loss, especially within the geriatric population, due to declining or absent knee and ankle musculature. When rising from a chair, these individuals heavily rely on their contralateral limb and upper limb strength to lift their body weight. Geriatric prosthesis users, who often have marginal and declining strength, could retain their independence if a prosthetic knee was capable of assisting with sit-to-stand-to-sit transitions. Unfortunately, the current designs of most commercially available prosthetic knees do not assist with the sit-to-stand-to-sit transition, a task that is fundamental for normal activities of daily living. The Assist-Knee design harvests the prosthesis user’s potential energy during the stand-to-sit transition and appropriately returns that energy to assist with the sit-to-stand transition. While harvesting energy, Assist-Knee provides a resistive knee extension moment that imitates eccentric contraction of the quadriceps muscles for a controlled stand-to-sit. The return of energy provides knee extension, imitating concentric activity of the quadriceps muscles, for an assisted sit-to-stand. The technological innovation of this design does not require a large motor, battery, or complex system to provide external power for knee extension assist. Our low-cost, lightweight design is an alternative to externally powered prosthetic devices. Since external power is not being added to the system, Assist-Knee is not intended to replicate maximum moment output at the knee but to provide a useful fraction of knee extension moment to assist with initiation of the sit- to-stand transition. The specific aims of this project involve: updating and optimizing the Assist-Knee design based on our successful Phase I findings and with a user-centered design approach that includes biannual meetings with stakeholders, and validating Assist-Knee in daily use with a laboratory and at-home clinical trial. Successful design and implementation of Assist-Knee will enable geriatric individuals with transfemoral limb loss to more easily complete sit-to-stand-to-sit transitions, increase independence by reducing the need for caretaker assistance, and help control the lowering of a user during the stand-to-sit maneuver. The commercial application of Assist-Knee is a low-cost, lightweight prosthetic alternative to assist individuals with transfemoral limb loss within the geriatric population to independently complete activities of daily living.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2023 ( Subtotal = $0 )
2023	2022	ORTHOCARE INNOVATIONS LLC	123 2ND AVE S	EDMONDS	WA	98020	SNOHOMISH	USA	Child Health and Human Development Extramural Research	001	3	9/28/2023	NON-COMPETING CONTINUATION	$0
2023	2022	ORTHOCARE INNOVATIONS LLC	123 2ND AVE S STE 220	EDMONDS	WA	98020	SNOHOMISH	USA	Child Health and Human Development Extramural Research	000	3	12/14/2022	NON-COMPETING CONTINUATION	$0
														Subtotal = $0

Issue Date FY: 2022 ( Subtotal = $872,638 )
2022	2022	ORTHOCARE INNOVATIONS LLC	123 2ND AVE S STE 220	EDMONDS	WA	98020	SNOHOMISH	USA	Child Health and Human Development Extramural Research	000	3	6/24/2022	NON-COMPETING CONTINUATION	$872,638
														Subtotal = $872,638

Issue Date FY: 2021 ( Subtotal = $665,414 )
2021	2021	ORTHOCARE INNOVATIONS LLC	123 2ND AVE S STE 220	EDMONDS	WA	98020	SNOHOMISH	USA	Child Health and Human Development Extramural Research	000	2	7/22/2021	COMPETING CONTINUATION	$665,414
														Subtotal = $665,414

Grand Total All Awards = $1,538,052

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Assist-Knee: Energy Harvesting for Sit-to-Stand-to-Sit Transitions

Award Number: R44HD097826

ORGANIZATION: NATIONAL INSTITUTE OF CHILD HEALTH AND HUMAN DEVELOPMENT

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 04/01/2019

PERIOD OF PERFORMANCE END DATE: 06/30/2024

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