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Reciprocating positive-displacement diaphragm pump for medical use

  • US 9,050,408 B2
  • Filed: 12/20/2010
  • Issued: 06/09/2015
  • Est. Priority Date: 12/23/2009
  • Status: Active Grant
First Claim
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1. A reciprocating positive-displacement diaphragm pump intended for pumping liquids for medical use, comprising:

  • a driving part within which there are an electromagnetic actuator formed of a magnetic circuit incorporating at least one coil and activating a piston of a moving member capable of cyclic linear motion, anda removable pump body within which there are an elastic diaphragm able to undergo a translational movement by elastic deformation from a normal rest position to an adjacent position through transmission of work from the piston,a first non-return valve positioned upstream of the said diaphragm to close an internal end of an inlet pipe at an inlet to the pump body and prevent any delivery of liquid,a second non-return valve positioned downstream of the diaphragm,one of the valves also being intended to prevent any gravity flow through a delivery pipe situated at an outlet of the said pump body,the pump further comprising means for detecting, in each cycle, out-of-tolerance variations in an intensity of a supply current that powers the electromagnetic actuator from measurements of the supply current,wherein the pump further comprises means for continuously taking measurements of an instantaneous position of the moving member along its line of travel and means for processing and analyzing said measurements of supply current and position, which are able to generate at least one alarm signal signifying that at least one malfunction has been detected,wherein said driving part is reusable and said removable pump body is single-use,wherein said elastic diaphragm is preloaded and a compensation member is positioned in said driving part in order to bring said moving member in contact with said elastic diaphragm, the preload of said diaphragm being sufficient to be able to return the moving member to the rest position against the weight of said moving member, plus the friction forces and the force applied by said compensation member.

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