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Electrically controlled intravenous infusion set

  • US 4,038,982 A
  • Filed: 12/03/1975
  • Issued: 08/02/1977
  • Est. Priority Date: 12/03/1975
  • Status: Expired due to Term
First Claim
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1. An intervenous infusion set for use with a supply of intravenous fluid, said set comprising in combination, a drip chamber adapted to be connected to said supply, a length of IV tubing connected to said drip chamber and forming with said drip chamber a fluid flow passage, valve means within said passage, electromagnetic valve operating means associated with said valve means, drop detector means associated with said drip chamber for sensing drops falling therethrough, a variable frequency clock, digital switch means coupled to said clock for digitally selecting the output frequency of said clock, said variable frequency clock including a time base generator having a preset frequency, a variable modulus counter, said digital switch means being coupled to said counter for allowing an attendant to select the modulus thereof, and means for multiplying said preset frequency by the selected modulus of said counter for digitally selecting the output frequency of said clock, whereby a desired drop rate may be selected by manipulation of the digital switch means, switch means coupled to said valve operating means for controlling energization of said valve operating means, circuit means coupling said clock to said switch means for actuating said switch means to energize the valve operating means to open the valve at the rate selected by said digital switch means, said circuit means including means responsive to said drop detector means for deactuating said switch means to deenergize the valve operating means and thus enable said valve to close upon sensing of a drop by said drop detector means, and alarm means for detecting errors in the drop rate from that set on said digital switch means and entering an alarm mode in response thereto, said alarm means including means for preventing energization of said switch means whenever said alarm means is in said alarm mode.

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