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Method for Urodynamics Testing and Analysing

  • US 20120179387A1
  • Filed: 09/13/2010
  • Published: 07/12/2012
  • Est. Priority Date: 09/16/2009
  • Status: Abandoned Application
First Claim
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1. A method for urodynamics testing and analysing, comprising:

  • Step 1;

    building an elastic element model of urethral bladder to regard the urine inside of urinary bladder before its releasing as a topological sphere, regarding the action of urinary bladder detrusor muscle and abdominal pressure as the action of the elastic element, the elastic modulus thereof is able to vary with time and space changing, and according to the elastic element model defining L=F(a) which shows the function relation between the length of elastic element L and the urine volume of urinary bladder a, and Δ

    L=ξ

    (Q,a) which shows the function relation between contraction length Δ

    L and urinary flow rate Q, urine volume of urinary bladder a;

    Step 2;

    building a urethral model which regarding urethra as horizontally-placed tube, and the length and cross section area thereof vary quickly over time, varying of momentum and energy of the urine in the urethral model reflects action of urethra on urine;

    Step 3;

    keeping anterior urethra perpendicular to the direction of gravity to measure and recording the urination data comprising an original position of urine releasing, a urine releasing height h, a mass of releasing urine mi over time ti, a horizontal displacement di, and calculating urination parameters comprising a urinary flow rate Q over time ti, a urine flow velocity vu-i, a kinetic energy of releasing urine per unit time Ei and a cross-sectional area Si of the urethral model;

    Step 4;

    calculating a contraction length of the elastic element Δ

    Li according to Δ

    L=ξ

    (Q,a) which shows a function relation between contraction length Δ

    L and urinary flow rate Q, urine volume of urinary bladder a, and further calculating the contraction velocity and contraction acceleration of the elastic element vi and ad-i so as to assess the contraction performance of detrusor muscle by using the maximum contraction acceleration of the elastic element ad-max;

    Step 5;

    learning the condition of urethral resistance by using the cross section area of the urethral model Si, and finding out the state of urethral obstruction by using the maximum cross section area Smax.

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