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Body fluid transfer device

  • US 4,850,955 A
  • Filed: 12/02/1986
  • Issued: 07/25/1989
  • Est. Priority Date: 12/02/1986
  • Status: Expired due to Fees
First Claim
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1. A body fluid drainage device which can be implanted subcutaneously in a patient and operated by pressure applied through the skin of the patient, the drainage device comprising:

  • (a) a pump body means having an internal cavity, said pump body means having substantially flat base means and a hollow dome means having a perimeter which is sealingly attached around its perimeter to said base means, said hollow dome means having an outer central portion and an inside and outside surface, said hollow dome means further including a sidewall and a major diameter at the perimeter attached to said base means, said base means having an outer edge and is sized the same or slightly larger than the major diameter of said dome means, the outer central portion of said dome means being truncated to form a generally centered flat surface which is substantially parallel to said base means so as to reduce the height of said dome means in order to mitigate stresses applied to the skin of the patient, said pump body means having an inlet and an outlet opening positioned in the sidewall of said dome means, the outlet opening being formed as a hollow vestibule means formed in the sidewall of said dome means;

    (b) at least first and second one-way vales are positioned within said pump body means, said first valve being mounted in said inlet opening with said second valve mounted within said vestibule means whereby liquid can only flow through said body means from said inlet through said outlet openings when a pressure differential across the device is sufficient to cause both valves to open and when the dome means is compressed toward the base means during a pumping cycle;

    (c) a first catheter adapted to be implanted in a body cavity of the patient which has excess fluids, said catheter having first and second open ends, a substantial portion of said catheter adjacent to said first end being perforated to facilitate entry of the excess fluid from the body cavity to the pump body means, the second end of said catheter being sealingly attached to the inlet opening in said pump body means;

    (d) a second catheter for transferring the fluid from the pump body means, an end of said second catheter being sealingly connected to the outlet opening of said vestibule means to allow the fluid to pass out of said pump body means;

    (e) said first one-way valve is a miter valve which includes top and bottom flattened adjoining portions having different mechanical characteristics so that superior external pressure depresses one portion of the valve more than the other so as to provide a differential movement of the flattened adjoining portions to provide a rubbing action to aid in preventing the valve from becoming clogged; and

    (f) at least one ridge is formed on the surface of said base means coinciding with the cavity of said pump body means, at least a portion of said ridge is positioned under said first one-way miter valve to prevent the valve from becoming sealed when the dome means is compressed during a pumping cycle.

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