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Pump monitor for photoactivation patient treatment system

  • US 4,623,328 A
  • Filed: 10/29/1984
  • Issued: 11/18/1986
  • Est. Priority Date: 10/29/1984
  • Status: Expired due to Term
First Claim
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1. A stepper motor monitor for use in a blood treatment system for photoactivating extracorporeally a photoactivatable reagent in contact with a patient'"'"'s blood, said system including an infusion pump driven by a shaft from a stepper motor, said monitor comprising:

  • periodic blocking means mounted on said stepper motor shaft for rotation therewith; and

    at least two sensors for generating a signal responsive to the periodicity of said blocking means, said sensors being stationary with respect to said periodic blocking means and arranged whereby one sensor is always unblocked and both sensors must be unblocked before one sensor can become blocked and in accordance with the said signals generated the rate or absence of stepper motor shaft rotation may be determined.

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