Patient-controlled traction device

Details Patient-controlled traction device Patient-controlled traction device

1990-08-29

1992-03-03

Hafer, Robert A.

Surgery: splint, brace, or bandage

Orthopedic bandage

Skeletal traction applicator

602 33, A61F 504

Patent

active

050923226

ABSTRACT:
A device for traction medical therapy exerts a force on the patient as selected via a patient or doctor-controlled hand-held unit. The unit sends signals to a traction puller device which may be secured to the end of the patient's bed, or on some other appropriate framework. Traction force is developed by a small fluid pump, preferably a vacuum pump, acting to evacuate a cylinder with a piston which is connected to a traction pulling line or cord connected to the patient. The patient can increase the traction force by further evacuation of the cylinder, and can lighten traction force by operating a valve which gradually vents vacuum from the system. In a preferred embodiment, the piston and cylinder have a rolling diaphragm, making the cylinder completely leak proof so that traction force will not dissipate over time. Another preferred feature is the inclusion of a differential controller which enables a traction patient to selectively set a given pulling force for the apparatus, regardless of movements of the patient which would otherwise tighten or slacken the traction line.

REFERENCES:
patent: 2871853 (1959-02-01), Demarest
patent: 3616795 (1971-11-01), Powlan
patent: 3847146 (1974-11-01), Cushman
patent: 3888243 (1975-06-01), Powlan
patent: 3910263 (1975-10-01), Wallander
patent: 3937216 (1976-02-01), Brown
patent: 4266537 (1981-05-01), Bonin, Jr.
patent: 4323060 (1982-04-01), Pecheux
patent: 4365623 (1982-12-01), Wilhelm
patent: 4583532 (1986-04-01), Jones
patent: 4768498 (1988-09-01), Herrick

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