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Surgically implantable pump

  • US 4,457,752 A
  • Filed: 09/13/1982
  • Issued: 07/03/1984
  • Est. Priority Date: 09/13/1982
  • Status: Expired due to Fees
First Claim
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1. A surgically implantable pump to eject liquid into a subject in which the pump is implanted, comprising a case means to enclose the pump, an orifice means through the case means by which liquid may be ejected from within the case means, a flexible reservoir means within the case means to hold the liquid and to eject it through the orifice means upon being compressed;

  • a piston means to compress the reservoir means; and

    magnetic responsive means to move said piston means only when the pump is positioned in a magnetic field, so that liquid is ejected upon positioning the pump in the magnetic field, the said magnetic responsive means including a spring which loads the piston means and which is compressed when the reservoir is full and a ratchet and pawl mechanism holding the spring against release, the pawl being magnetically responsive, wherein the pawl releases the ratchet step-by-step each time it is positioned within the magnetic field.

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