Prosthetic socket release/relock system

Inventors: Joan E. Sanders (Seatlle, WA); Joseph L. Garbini (Seattle, WA); Clement Gurrey (Seattle, WA); Katheryn J. Allyn (Seattle, WA); Jake McLean (Seattle, WA); Brian Larsen (Seattle, WA)

Assignee: University of Washington

A61F2/80 A43C11/165 A61F2002/802

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Quick Facts

Patent No.: US 12697234
App. No.: 18/178,138
Granted: Aug 4, 2026
Kind: B2

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Abstract

A device configured to be positioned within a prosthetic socket includes a tether, a spool, a motor, a coupling mechanism, a release actuator, and a tightening actuator. A first end of the tether is configured to be coupled to a prosthetic liner, and a second end of the tether is coupled to the spool. The spool is fixed with respect to the prosthetic socket. The coupling mechanism transitions from a first position in which the spool is restricted to rotate in a first direction to a second position in which the spool is not restricted. The release actuator and tightening actuator are positioned on an exterior of the prosthetic socket. Actuating the release actuator causes the coupling mechanism to transition from the first position to the second position. Actuating the tightening actuator causes the motor to rotate the spool in the first direction to wind the tether around the spool.

Claims (37)

1 . A device configured to be positioned within a prosthetic socket, the device comprising:

a tether having a first end and a second end opposite the first end, wherein the first end of the tether is configured to be coupled to a prosthetic liner;

a spool fixed with respect to the prosthetic socket, wherein the second end of the tether is coupled to the spool;

a motor fixed with respect to the prosthetic socket, the motor comprising a motor encoder;

a battery configured to provide power to the motor;

a coupling mechanism configured to transition from a first position in which the spool is only able to rotate in a first direction to a second position in which the spool is able to rotate in the first direction and a second direction;

a release actuator positioned on an exterior of the prosthetic socket, wherein actuation of the release actuator causes the coupling mechanism to transition from the first position to the second position;

a tightening actuator positioned on the exterior of the prosthetic socket, wherein actuation of the tightening actuator causes the motor to rotate the spool in the first direction to wind the tether around the spool to thereby reduce a distance between the first end of the tether and the spool; and

a control unit in communication with the motor, wherein the control unit is configured to:

determine, based on the motor encoder, the distance between the first end of the tether and the spool; and

activate the coupling mechanism based on the determined distance.

2 . The device of claim 1 , further comprising a housing positioned at least partially surrounding the spool, the motor, the battery, and the coupling mechanism.

3 . The device of claim 2 , wherein the housing is formed integral to the prosthetic socket during fabrication.

4 . The device of claim 1 , wherein the device is removably coupled to the prosthetic socket.

5 . The device of claim 1 , wherein actuation of the tightening actuator causes the coupling mechanism to transition from the second position to the first position.

6 . The device of claim 1 , wherein the release actuator comprises a button, and wherein pressing the button a first time causes the coupling mechanism to transition from the first position to the second position to thereby enable a user to increase the distance between the first end of the tether and the spool to a first distance to thereby partially doff the prosthetic socket, and wherein the coupling mechanism transitions from the second position to the first position once the first end of the tether and the spool are separated by the first distance.

7 . The device of claim 6 , wherein the first distance ranges from about 3 cm to about 10 cm.

8 . The device of claim 6 , wherein pressing the button a second time when the first end of the tether and the spool are separated by the first distance causes the coupling mechanism to transition from the first position to the second position to thereby enable a user to increase the distance between the first end of the tether and the spool from the first distance to a second distance to thereby fully doff the prosthetic socket.

9 . The device of claim 8 , wherein the second distance ranges from about 20 cm to about 50 cm.

10 . The device of claim 1 , wherein the release actuator comprises a button, wherein pressing the button for a first length of time causes the coupling mechanism to transition from the first position to the second position to thereby enable a user to increase the distance between the first end of the tether and the spool to a first distance to thereby partially doff the prosthetic socket, wherein the coupling mechanism transitions from the second position to the first position once the first end of the tether and the spool are separated by the first distance, and wherein pressing the button for a second length of time that is greater than the first length of time causes the coupling mechanism to transition from the first position to the second position to thereby enable a user to increase the distance between the first end of the tether and the spool to a second distance that is greater than the first distance to thereby fully doff the prosthetic socket.

11 . The device of claim 10 , wherein the first distance ranges from about 3 cm to about 10 cm, and wherein the second distance ranges from about 20 cm to about 50 cm.

12 . The device of claim 1 , further comprising:

a solenoid coupled to the coupling mechanism, wherein actuation of the solenoid causes the coupling mechanism to transition from the first position to the second position.

13 . The device of claim 1 , further comprising:

a first gear coupled to the motor; and

a second gear coupled to the spool, wherein the second gear interacts with the first gear to translate rotation of the motor to the spool.

14 . The device of claim 1 , further comprising:

a knob positioned on the exterior of the prosthetic socket, wherein the knob is coupled to the spool such that a rotation of the knob in the first direction causes the spool to rotate in the first direction to wind the tether around the spool to thereby reduce the distance between the first end of the tether and the spool.

15 . The device of claim 1 , wherein the coupling mechanism comprises a ratchet and a pawl mechanism, wherein the ratchet is fixed with respect to the spool, and wherein the pawl mechanism is configured to transition from the first position to the second position.

16 . The device of claim 1 , further comprising:

a release mechanism coupled to the first end of the tether, wherein the release mechanism is configured to be removably coupled to a pin of the prosthetic liner.

17 . The device of claim 16 , wherein the release mechanism comprises:

an opening configured to receive the pin of the prosthetic liner; and

a rotatable component configured to transition from a first position in which the opening is uncovered by the rotatable component to a second position in which the opening is covered by the rotatable component.

18 . The device of claim 1 , wherein the control unit is configured to:

record a number of times the release actuator is actuated over a given time period; and

transmit a message indicating the number of times the release actuator is actuated over the given time period.