Patent Application
20220211532
This application claims the benefit of provisional application of the same name filed Jan. 3, 2020
The problem with loads on non weightbearing casts is that the flesh of the heel easily develops ulcers when contact over 5 pounds is applied. There are no notable solutions to this problem in the prior art.
This inventor arrived at this design as an orthopedist, in a Technician capacity, over the course of 30 plus years of experience. It is a necessary improvement to the art of cast making.
This disclosure provides the method for installing the apparatus, and similar competitive conceptual apparatuses.
This disclosure provides a method and alternate method embodiments for installing an apparatus, which can be used to install similar competitive conceptual apparatuses.
About the Apparatus and Similar Conceptual Apparatuses
The solution herein disclosed redirects the two common axial forces from the heel area to a point above and forward. The primary embodiment includes two brackets that protect the bottom and back of the heel from contacts. The brackets are cast as part of the leg cast with plaster or other methods.
The first alternative embodiment comes from the objective of the device—to prevent contact at the heel. The idea is to add an audible “click” at the bracket to notify the wearer that a load of more than 5 pounds has been experienced by the cast. The click should reset—spring loaded perhaps—so that it is repetitive, notifying the wearer of his/her many 5 #overloads. The intent is to be disruptive, to create an incentive to stop overloading the cast.
The second alternative embodiment speaks to children—who are probably notorious for overloading the cast at the heel. The suggestion is to reshape the attached brackets to a more entertaining but functional design. Replacing the rear and lower guards with a pair of ears and a tail, for example.
Another embodiment continues to use electronics that would allow both notice that an overload has occurred and there is an aesthetic advantage for younger wearers.
a. in an embodiment, Electronics includes switches mounted on the brackets to activate on 5 #overload, with red LED indicators that flash for 5 seconds when an overload condition is momentarily present.
b. Electronics can include a sonolert—an audible alarm to indicate an overload condition. The alarm can be a click, for subtlety. The alarm can be a garish siren.
In an embodiment, Other electronics include a molded pressure pad with multiple pressure sensors that respond to 5 #loading. Schmersal sms4-500-500 is an exemplary pressure mat with about 244 sensors. This would be overkill, but offers the concept of a low profile mat with multiple input sensors. In this application, only 4 to 6 sensors are needed in a minimal arrangement.
In an embodiment, in place of the brackets, a single molded cap could be used. The cap would secure to the cast similar to the brackets—at two opposite sides of the heel. The cap, however would be closer to the cast than ¾″. The cap can have electronic switches that mount and operate similar to those previously discussed. A concept is below, the already broken nose does not stop a player from basketball because the mask redirects any forces away from the nose and to other parts of the face.
In an embodiment, using the primary embodiment concept, it is possible to redirect forces to any best part of the cast using dual mounts and eccentric loading. That is to say, the original design directs all forces to the two points of attachment. If, in fact, the best place to redirect a load is to the back of the ankle—along the achilles. Were that true, the rear bracket could attach at two points on either side of the ankle—4 points total. On each side, the first attachment point is lower than the other—one toward the sole of the foot and the other higher on the leg—perhaps ½″ apart. The attachment points are also slightly (e.g. ¼″) offset forward and rearward. With this 4 point mounting, any load directed toward the back of the heel would be received by the two attachment points unevenly. This would cause a torque that would apply the force at the back of the leg or on the sole of the foot. With an alternative positioning of the 4 mounting points a torque could be applied wherever is best.
In an embodiment, force pads (a pair of pads electronically connected by a normally open switch) are used as contact points molded into the cast by applying an additional pad at the places where the load is more optimally applied. The concept of a broad, soft pad at the heel was rejected because it could force the contact and a resulting ulcer. However, the top of the foot, the bottom sole of the foot and the back of the ankle are apparently good places to direct/redirect forces. Here, during the cast molding process a force pad is placed in contact with the foot/leg at the best points for directing contact forces—and then the remaining wrapping and other casting processes are completed.
The electronic concepts apply to all embodiments presented.
