| 摘要 |
A traction fulcrum arm is pivoted intermediate its ends on a support post and carries at one end a head halter tending to lift up on the patient's head in response to weights on the opposite end of the arm tending to pivot the arm downwardly. A motorized cam intermittently raises the weight end of the arm relieving the traction on the patient on a cyclical basis of 10 to 40 seconds. An an alternative to using the weights, a spring may be connected between the fulcrum arm and the frame to produce tractive forces. The desired angle of 45 degrees traction may be obtained through adjustment of the post vertically and the head halter carried on the arm while also adjusting the positioning of the chair towards and away from the head halter. The support post may also be pivoted away from the person in the chair for access in and out of the chair.
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