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Cystometry system

  • US 4,301,811 A
  • Filed: 04/04/1980
  • Issued: 11/24/1981
  • Est. Priority Date: 10/27/1978
  • Status: Expired due to Term
First Claim
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1. A system to measure the pressure-volume relationship in a body cavity of a patient, comprising:

  • a source of fluid;

    a catheter having an elongated shaft defining an infusion lumen communicating with an infusion opening adjacent a distal end of the shaft;

    pump means;

    valve means communicating with the catheter infusion lumen, the pump means, and the supply, said valve means permitting passage of fluid from the supply to the pump means and preventing passage of fluid from the pump means to the supply, said valve means permitting passage of fluid under pressure from the pump means to the infusion lumen and preventing passage of fluid from the infusion lumen to the pump means;

    pressure measuring means effectively communicating with the infusion lumen intermediate the infusion opening and the valve means;

    means for preventing passage of fluid from the supply to the infusion lumen below a predetermined pressure, and permitting passage of fluid above the predetermined pressure responsive to pressure generated by the pump means; and

    means, interposed between the infusion lumen and the pressure measuring means, defining a restricted opening for limiting passage of fluid into the pressure measuring means whereby, during operation of said pump means to direct fluid into a body cavity through said infusion lumen, passage of fluid into said pressure measuring means is limited to a negligible amount.

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