A - Human Necessities – 61 – H
Patent
A - Human Necessities
61
H
128/24
A61H 1/02 (2006.01)
Patent
CA 1227979
ABSTRACT A continuous passive motion (CPM) device for the hand which selectively provides continuous passive motion to the metacarpophalangeal (MP) and/or interphalangeal (IP) joints of selected fingers (excluding the thumb) of the joints of the hand. The device consists essentially of two components: a hand drive unit that mounts to a forearm splint, and a microprocessor based controller drawing power from a rechargeable power pack. The hand drive unit includes a housing having a base portion mounted on the forearm splint for supporting the motor and other control components, and a gear drive train for conveying rotational movement to the joints of the fingers. The housing in- cludes two arms which extend from the base portion down the sides of the patient's hand. A gear train is included in each arm. Movable drive arms are connected to either of two points on the drive train. The point of connec- tion, which is coaxial with one of two separate gears in each train, causes rotation of the drive arms about an axis which defines metacarpophalangeal (MP) joint motion or interphalangeal (IP) joint motion in the joints of the attached fingers. The ends of the drive arms are connected to a finger drive rod. The drive rod is selectively connected to the fingers of the hand utiliz- ing drive blocks which comprise a rectangular slotted plastic block mounted on an adhesive tape. The drive rod passes through the slot on the block to con- vey the rotational motion of the drive arms to the finger joints, the adhesive band is wrapped around the appropriate portion of the finger which is to under- go continuous passive motion treatment, For interphalangeal (IP) joint motion, the block is adhesively attached to the distal phalanx. For metacarpophalangeal (MP) joint motion, the block is attached to the proximal phalanx. The arms of the housing and the gear train are designed so that the axis of motion of the drive arms lies as close as possible to the axis of the joint to be exer- cised when the CPM device is in place on the hand.
473356
Dumas Christopher C.
Filia Philip J.
Koerner Richard J.
Lawrence Ronald L.
Petch David B.
Smart & Biggar
Sutter Biomedical Inc.
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