Orthosis for supination and pronation of the wrist

Details Orthosis for supination and pronation of the wrist Orthosis for supination and pronation of the wrist

1999-02-01

2001-01-30

Lewis, Kim M. (Department: 3733)

Surgery: splint, brace, or bandage

Orthopedic bandage

Splint or brace

C602S005000, C602S016000, C602S021000

Reexamination Certificate

active

06179799

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to orthotic devices for rehabilitation of the human wrist and more specifically to an orthosis applying a static, progressive, or dynamic force to pronate or supinate the wrist or to limit the range of motion of pronation or supination.
BACKGROUND OF THE INVENTION
Various devices have been proposed for rotating the human wrist about the longitudinal axis of the forearm. Many of these devices are bulky and complicated. Some of these devices are disposed along the underside of the arm such that the patient cannot lay his arm on a desk or table in a natural manner. Some devices only move the wrist in conjunction with flexure of the elbow. Some devices rotate the wrist through only a small arc, typically 90° or less. Many of these devices must be specifically fabricated for each patient.
Therefore there has been a need for an orthosis for pronation and supination of the human wrist that is simple in construction, that is easily adaptable to a variety of patients, that may be positioned on the top of the forearm such that the arm can be placed naturally on a desk, that is capable of moving the wrist from supine to prone, and that is easily adjustable by the patient to produce the desired results.
SUMMARY OF THE INVENTION
This invention is an orthosis for supination-pronation of the human wrist and it includes an arm cuff secured to the arm including a forearm platform on the forearm directly adjacent the elbow. A wrist connector includes a swing arm having a longitudinal axis and including a wrist end and an upper end pivotally connected to the forearm platform near the elbow and about a pivot axis radial to the longitudinal axis of the forearm. A wrist cuff, adapted to be secured to the arm adjacent the wrist, includes means connected to the wrist end of the swing arm. Swing means interacts between the arm cuff and the wrist connector for applying to the wrist connector a force tending to swing the swing arm about the pivot axis of the upper pivot and thereby rotate the wrist.
The length of the swing arm between the pivot axis of the upper pivot and the wrist end is adjustable and, preferably, is freely variable between selected margins during rotation of the wrist.
The swing means may be a tension member, such as an elastic cord, connected between the wrist connector and the arm cuff. Alternate swing means includes screws interacting between the forearm platform and the swing arm.
Means is provided for selectively rotating the wrist end of the swing arm about the longitudinal axis of the swing arm.
Preferably, a wrist pivot includes a pivot pivotally connecting the wrist end of the swing arm to the wrist cuff about a wrist pivot axis radial to the longitudinal axis of the forearm, a shaft for attaching the wrist end of the swing arm at selected radial distances from the wrist pivot axis, and a radial slot for attaching the wrist end of the swing arm at selected radial distances from the wrist cuff.
Other features and many attendant advantages of the invention will become more apparent upon a reading of the following detailed description together with the drawings in which like reference numerals refer to like parts throughout.


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North Coast Medical 1998 Hand Therapy Catalog p. 87 (Pronation/Supination Splint).
Smith & Nephew Inc/Rehabilitation Division 1998 Catalog p. 90 (Pronation/Supination Splint).
Joint Active Systems Brochure.

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