Failsafe device for prosthetic limb

Patent metadata

Field	Value
Publication number	US-10772745-B2
Application number	US-201715856566-A
Country	US
Kind code	B2
Filing date	Dec 28, 2017
Priority date	Jan 5, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A failsafe for a transdermal apparatus for a prosthetic appendage can include a first plate, a second plate, and a breakaway connector. The first plate can have a central axis, a proximal portion, and a distal end. The distal end can be opposite the proximal portion, and the distal end can be securable with a prosthetic external to skin and can be configured to simulate an appendage of a patient. The second plate can be aligned with the central axis and can include a proximal end and a distal portion. The proximal end can be securable to a transdermal implant, and can extend proximally from the second plate. The distal portion can be opposite the proximal end, and the distal portion can be configured to interface with the proximal portion of the first plate. The breakaway connector can be couplable within the second plate and the first plate.

First claim

The claimed invention is:

1. A failsafe for a transdermal apparatus for a prosthetic appendage, the failsafe comprising:
a first plate having a central axis, the first plate comprising:
a proximal portion defining a plurality of recesses;
a distal end securable with a prosthesis configured to be disposed external to skin, the prosthesis configured to simulate an appendage of a patient; and

a second plate alignable with the central axis, the second plate comprising:
a proximal end securable to a transdermal implant, the proximal end extending proximally from the second plate; and
a distal portion configured to interface with the proximal portion of the first plate;

a plurality of retaining members extending from the second plate and configured to engage the recesses to transfer torque between the first plate and second plate when a torque is below a threshold torque and configured to disengage from the recesses and allow rotation of the first plate relative to the second plate when an applied torque is above the threshold torque; and
a breakaway connector coupleable within the second plate and the first plate and secured to the first plate, the breakaway connector configured to allow the second plate to break away from the first plate and the breakaway connector when a moment applied to both the first and the second plate is larger than a threshold moment, the breakaway connector configured to engage the first plate and the second plate to cause the distal portion of the second plate to contact the proximal portion of the first plate and to secure the first plate to the second plate.

2. The failsafe of claim 1 , wherein the breakaway connector is secured to the second plate and is configured to break away from the first plate.

3. The failsafe of claim 2 , further comprising:
a fastener engageable with the breakaway connector to secure the breakaway connector to the first plate and the second plate.

4. The fail safe of claim 1 , wherein the moment can be applied in any plane of the device, and wherein the breakaway connector is configured to cause the second plate to separate from the first plate due to the moment when the moment in any plane is greater than the threshold moment.

5. The fail safe of claim 1 , wherein the breakaway connector further comprises:
a base; and
a plurality of arms projecting axially from the base and extending between the second plate and the first plate.

6. The failsafe of claim 5 , wherein the plurality of arms each comprise a prong disposed at a termination of each arm, each prong extending radially outward from each arm to create a radial extension.

7. The fail safe of claim 5 , wherein each radial extension of each prong is configured to engage a radial surface of a counterbore of one of the first plate and the second plate to engage the first plate and the second plate.

8. The failsafe of claim 5 , wherein the plurality of arms are configured to reversibly deflect radially inward, allowing the second plate to break away from the first plate when the arms deflect radially inward.

9. The failsafe of claim 1 , the second plate further comprising:
an opening at the proximal end of the second plate configured to receive the transdermal implant therein.

10. The failsafe of claim 9 , further comprising:
an arm pivotably coupled to the top plate proximate the proximal end, the e arm pivotable between an open position and a closed position.

11. The failsafe of claim 10 , further comprising:
a cam and lever coupled to the proximal end, the lever movable to actuate the cam and tighten the arm to secure the transdermal implant to the second plate.

12. The failsafe of claim 11 , the arm further comprising:
a flange extending radially and including eye configured to receive the cam therethrough.

13. The failsafe of claim 12 , further comprising:
a biasing element engageable with the flange and the lever to bias the arm toward the open position.

14. The failsafe of claim 13 , wherein the biasing element is a spring disposed around the cam.

15. The failsafe of claim 14 , the top plate further comprising:
a slot configured to receive at least a portion of the arm therein to secure the transdermal implant to the top plate.

16. The failsafe of claim 15 , further comprising:
a nut engageable with the cam to adjust a distance that the arm extends into the slot in the closed position to adjust a clamping force applied by the arm to the transdermal implant.

17. The failsafe of claim 10 , further comprising:
a pin coupling the arm to the proximal end, the arm pivotable about the pin.

18. A failsafe for a transdermal apparatus for a prosthetic appendage, the failsafe comprising:
a first plate having a central axis, the first plate comprising:
a proximal portion; and
a distal end securable with a prosthesis configured to be disposed external to skin, the prosthesis configured to simulate an appendage of a patient;

a second plate alignable with the central axis, the second plate comprising:
a proximal end securable to a transdermal implant, the proximal end extending proximally from the second plate; and
a distal portion configured to interface with the proximal portion of the first plate; and

a breakaway connector coupleable within the second plate and the first plate and configured to allow the second plate to break away from the first plate when a moment applied to both the first and the second plate is larger than a threshold moment, the breakaway connector comprising:
a base; and
a plurality of arms projecting axially from the base and extending between the second plate and the first plate, the plurality of arms each including a prong disposed at a termination of each of the arms, each of the prongs extending radially outward from each of the arms to create a radial extension.

Assignees

• Biomet Mfg Llc

Inventors

• Porter Joshua R
• Roberts Mark
• Toler Jason S

Classifications

• A61F2002/6845

  Clutches · CPC title

• A61F2/78 Primary

  Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump · CPC title

• A61F2002/7887

  for connecting limb exoprostheses to the stump bone · CPC title