Gas column pressure monitoring catheters

  • US 5,573,007 A
  • Filed: 08/08/1994
  • Issued: 11/12/1996
  • Est. Priority Date: 08/08/1994
  • Status: Expired due to Term
First Claim
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1. A gas-column catheter for monitoring intravascular pressure within the vein or artery of a mammalian body, said catheter comprising:

  • a catheter body having a proximal end, a distal end, and an outer surface and being of a size and shape to fit within the vein or artery of said mammalian body;

    a gas-filled lumen extending longitudinally through at least a portion of said catheter body;

    a gas-filled membrane-wailed chamber at a fast location on said catheter body, said chamber being in gaseous communication with said lumen and being of a size and shape to fit within the vein or artery of said mammalian body and to monitor said intravascular pressure, said chamber being defined at least in pan by a flaccid membrane having an inner surface and an outer surface, said membrane being configured and positioned such that;

    an increase in pressure against the outer surface of said membrane will cause said membrane to move inwardly, thereby increasing the pressure of gas within said chamber and said lumen;

    and a decrease in pressure against the outer surface of said membrane will allow said membrane to move outwardly, thereby decreasing the pressure of gas within said chamber and said lumen;

    said gas filled lumen being thereby operable to transmit, in the proximal direction, changes in intravascular pressure exerted within the vein or artery and against the outer surface of said flaccid membrane; and

    a catheter-inflating connector apparatus connectable to said catheter, said apparatus being constructed such that connection of said catheter thereto will automatically cause a prescribed volume of gas to be entrapped within said catheter.

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