Dexterous Partial Hand Prosthesis Outcomes

Sponsor

Liberating Technologies, Inc. (Industry)

Overall Status

Recruiting

CT.gov ID

NCT05038566

Collaborator

Össur Ehf (Industry)

Enrollment

Locations

Arms

12.5

Anticipated Duration (Months)

Patients Per Site

0.5

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

Liberating Technologies, Inc. (LTI) has developed a dexterous prosthetic fingertip that will be fit onto an i-Digits™ partial hand prosthesis and allow for an additional fine grasp. The device will interface with research participants' existing prostheses and use the same control strategy that is used for their everyday use. Each participant's prosthesis will be restored to their original configuration by the end of their testing period.

Condition or Disease	Intervention/Treatment	Phase
Amputation Amputation; Traumatic, Hand Limb; Absence, Congenital, Upper Prosthesis User Upper Limb Amputation at the Hand	Device: Pointdexter	N/A

Detailed Description

Liberating Technologies, Inc. (LTI) has developed a dexterous prosthetic fingertip that will be fit onto an i-Digits™ partial hand prosthesis and allow for an additional fine grasp. The device will interface with research participant's existing prostheses and use the same control strategy that is used for their everyday use. Each participant's prosthesis will be restored to their original configuration by the end of their testing period.

The study will focus on design feasibility testing and will compare performance of hand functional outcome tests on an i-Digits™ prosthetic partial hand with and without the investigational Pointdexter modification. Our primary hypothesis is that subjects using the investigational device will show better performance on objective functional outcomes measures than those using a standard i-Digits™ partial hand prosthesis, particularly in the manipulation of small objects.

The investigators will explore multiple outcomes measures as options, but our primary endpoint will be performance on the Small Common Objects subtask of the Jebsen-Taylor Hand Function Test, which assesses a broad range of unimanual hand functions required for ADLs. The primary quantitative measure of the Jebsen-Taylor task will be completion time of each subtask. Qualitative evaluation will be conducted by an occupational therapist via observation, and by the user through a self-assessment questionnaire, such as the Patient Specific Functional Scale (PSFS). The investigators will be performing repeated measures on each individual subject to reduce the variance as well as having each subject act as their own control. New and existing i-Digits™ partial hand prosthesis users will be recruited for the study and consented with an approved protocol. Research participants will schedule a time to conduct the testing and be informed of study details.

The investigational device being tested is a novel prosthetic finger with a built-in split gripper. The device is an index finger which can drop in place of existing digits on an i-Digits™ partial hand prosthesis. The investigational device is controlled with the same signals as the conventional digits.

This study will pilot test the dexterous fingertip prosthesis with a small number of subjects (up to 12). Research participants will be consented and will test the device at home and/or in-lab. Subjects will be introduced to the partial hand prosthesis configuration and be instructed on how to operate it to complete their testing session.

The in-lab testing will be conducted in a single site visit at Össur Academy in Dublin, Ohio or LTI in Holliston, MA. Subjects may be asked to come back for an additional site visit if data collection is incomplete. For this study, the index finger of each participant's existing everyday prosthesis will be temporarily disconnected and replaced with the investigational device. The prosthesis will be restored to its original configuration when the test session has been completed. At the start of the study session, subjects will prepare for testing in their first configuration (investigational or comparator). If investigational, subjects will doff their prosthesis and investigators will replace the usual i-Digits™ index finger with the investigational device. If comparator, subjects will don their usual unmodified prosthesis. Subjects will be trained on how to operate the investigational device and be allowed a minimum of 30 minutes to practice using it until they are comfortable with proceeding. The subjects will be guided to conduct functional outcome tests that involve picking up and manipulating everyday objects (beans, coins, pegs, spoon, cloth, etc.), such as the tasks outlined in the Jebsen-Taylor and Peg Board functional tests. Each sub-task in the functional test will be scored by occupational therapist standards. After a round of functional testing is done, subjects will fill out the PSFS survey and subjective questionnaire. Subjects will then doff the prosthesis and don the next device configuration. Subjects will repeat the functional tests and surveys with each device configuration. After the final condition, the subject will have completed the study and their prosthesis will be restored to its usual configuration. The study session should span 3-5 hours.

A subset of subjects will take home the investigational device for up to 4 weeks to provide feedback of the device when used in everyday tasks. Investigators will restore the user's prosthesis at the end of the testing period and surveys will be conducted to capture feedback. Two site visits may be required: one to initialize the study and configure the prosthesis, and two to restore the prosthesis at the study end.

Both new and existing i-Digits™ partial hand prosthesis users will be invited to participate in the study. Research participants will schedule a time to conduct the testing and be informed of study details. Participants will be given as much time as needed to review and question the informed consent form before signing.

Two different technologies will be assessed:

Investigational Device: i-Digits™ partial hand prosthesis with dexterous fingertip modification
Comparator Baseline: unmodified i-Digits™ partial hand prosthesis

Persons with partial hand limb absence who are new or current i-Digits™ prosthesis users will be recruited for this study through the LTI and Össur clinician network. Prosthetists may be contacted with the need for research subjects and, if interested, will be given flyers to hand out to their patients. If subjects are interested in participating, they can call the number on the flyer to speak with investigators. In addition, previous research participants who have given permission to be contacted for future studies may be contacted directly to assess interest in participating in this study. Enrollment will be open to people of all ages, genders, races, and ethnicities. Participants must be new or current users of i-Digits™ partial hand prostheses. The user must have an absent index finger at minimum. Patients who have 4-5 digit and/or thumb involvement will be preferred.

Based on subject population and availability, a convenience sample of up to 12 subjects will be recruited for this pilot study.

Study Design

Study Type:

Interventional

Anticipated Enrollment :

12 participants

Allocation:

Non-Randomized

Intervention Model:

Parallel Assignment

Intervention Model Description:

A functional test will be used to evaluate the feasibility of the device design as compared with a baseline condition.A functional test will be used to evaluate the feasibility of the device design as compared with a baseline condition.

Masking:

None (Open Label)

Primary Purpose:

Device Feasibility

Official Title:

Dexterous Partial Hand Prosthesis Outcomes

Actual Study Start Date :

Jul 15, 2021

Anticipated Primary Completion Date :

Jul 31, 2022

Anticipated Study Completion Date :

Jul 31, 2022

Arms and Interventions

Arm	Intervention/Treatment
No Intervention: Comparator Baseline The subject wears their usual partial hand prosthesis while performing functional outcome measures.
Experimental: Pointdexter The subject wears a modified version of their usual partial hand prosthesis. The modification replaces the usual index finger of the partial hand prosthesis with the investigational Pointdexter device. Subjects will either test out this hand configuration in the lab while performing functional outcome measures or at home in their daily lives for approximately four weeks.	Device: Pointdexter i-Digits partial hand prosthesis modified with the investigational pointdexter finger in place of the usual index finger. Other Names: Dexterous Partial Hand Prosthesis Gripper

Arm

Intervention/Treatment

No Intervention: Comparator Baseline

The subject wears their usual partial hand prosthesis while performing functional outcome measures.

Experimental: Pointdexter

The subject wears a modified version of their usual partial hand prosthesis. The modification replaces the usual index finger of the partial hand prosthesis with the investigational Pointdexter device. Subjects will either test out this hand configuration in the lab while performing functional outcome measures or at home in their daily lives for approximately four weeks.

Device: Pointdexter

i-Digits partial hand prosthesis modified with the investigational pointdexter finger in place of the usual index finger.

Other Names:

Dexterous Partial Hand Prosthesis

Gripper

Outcome Measures

Primary Outcome Measures

Jebsen-Taylor Small Common Objects Functional Test [4 hours]
During the in-lab portion of the study, subjects will be asked to complete the 'small common objects' subtask of the Jebsen-Taylor Hand Function Test, which assesses a broad range of unimanual hand functions required for ADLs. The primary quantitative measure of the Jebsen-Taylor task will be completion time of each subtask. This test will be used to evaluate the feasibility of the device design as compared with a baseline condition.
User and Clinician Feedback [4 hours]
Investigators will collect feedback about the device design and how the user would compare manipulating common objects with the investigational device vs. the standard i-Digits partial hand prosthesis. The investigators conducting the in-lab study will use their clinical expertise to report on if the device is working as expected and if they have any recommendations to incorporate into the design.

Secondary Outcome Measures

Patient-Specific Functional Scale (PSFS) Survey [Duration of study: (In-Lab: ~4 hours, Take-home: ~4 weeks).]
This short questionnaire asks the patient to identify up to five important activities they are unable to perform or are having difficulty with as a result of their upper limb difference. They are asked to rate the current level of difficulty associated with each activity on a scale of 0 (Unable to perform activity) to 10 (Able to perform activity at the same level as before injury or problem).

Eligibility Criteria

Criteria

Ages Eligible for Study:

N/A and Older

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

Must have an upper limb partial hand absence.
Must be new or current i-Digits prosthesis users.
Must have an absent index finger at minimum.
Must be able to understand spoken and written English in order to be properly consented and provide feedback to the study personnel.
Must be willing and able to complete outlined tasks and provide feedback on the intervention.