A multidisciplinary team at the University of California at San Diego has come up with a computerized glove used as a sensor to measure spasticity, or stiffness, in the limbs of patients with multiple sclerosis, cerebral palsy, and stroke.
The system is more accurate than physicians’ assessments of spasticity through touching, but still needs work, the team said.
Experts in signal processing, robotics, printable electronics, neurosciences and medicine teamed up to develop the device, which will allow doctors to adjust medication to meet patients’ spasticity needs.
Inaccurate measurements of spasticity can lead to patients receiving too little or too much medication for spasticity. This can mean ineffective treatment on the one hand. Or, on the other hand, it can mean money wasted on high doses of medication that are not needed, or even overdoses.
Physicians assess spasticity on the basis of how much resistance they feel when moving a patient’s limbs. They rate the resistance on the Modified Ashworth Scale (MAS), a simple measure of spasticity.
Results for the same patient can vary greatly from one physician to the next. The goal of using a glove with sensors is to have an objective, accurate, and consistent measure of spasticity.
A doctor wears the glove, which is a regular sports glove with over 300 pressure sensors taped to the palm. The sensors are connected to a computer that calculates the amount of power needed to move a limb. The more power needed, the greater the spasticity.
In an initial study, two physicians assessed spasticity in five cerebral palsy patients by feeling resistance in the flexing and extending of patients’ arms and legs. The physicians provided their own spasticity ratings using MAS, without knowing the readings from the glove.
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