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Two-way outdwelling slit valving of medical liquid flow through a cannula and methods

  • US 5,169,393 A
  • Filed: 10/15/1991
  • Issued: 12/08/1992
  • Est. Priority Date: 09/04/1990
  • Status: Expired due to Term
First Claim
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1. A cardiovascular assembly comprising:

  • first tubing means comprising a hollow interior for placement, at a distal end thereof, in a cardiovascular system of a patient;

    a source of liquid disposed external of the patient by which a first non-reciprocating liquid pressure is created in the assembly and from which an essentially uncontaminated flow of the liquid is provided to the patient;

    second tubing means comprising a hollow interior and distal and proximal ends disposed external of the patient, the hollow of the interior of the second tubing means at the proximal end being in direct communication with the source liquid at the first liquid pressure;

    valve structure contiguously and directly interposed between the distal end of the second tubing means and the first tubing means at a proximal end thereof external of the patient, a proximal part of the valve structure being in communication with the interior of the second tubing means at the distal end thereof, the source liquid therein and the first liquid pressure and a distal part of the valve structure being only in communication with the hollow interior of the first tubing means at a proximal end thereof and adapted to be in communication with a second patient cardiovascular system determined pressure;

    the valve structure comprising centrally interior normally closed bi-directionally pressure-responsive slit valve means, the slit valve means being imperviously secure at its periphery and selectively accommodating liquid flow across the valve structure only along selectively openable/closeable centrally disposed flow path means in either a proximal or a distal direction between the interiors of the second tubing means and the first tubing means during any liquid flow to a desired destination depending upon predetermined differences between the first and second pressures;

    the slit valve means comprising an elastomeric diaphragm which is flat and of a predetermined generally uniform thickness; and

    the centrally disposed flow path means comprising a central slit of predetermined length having opposed lips whereby the lips of the slit are flexed open in either direction only when the difference in the first and second pressures is above a predetermined threshold value.

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