Anti-refluxive internal ureteral stent with a dynamic hood-valve at the vesical end for prevention of urinary reflux into the upper urinary tract upon increase of vesical pressure
First Claim
1. An anti-refluxive internal ureteral stent, comprising:
- a) a catheter having an open end;
b) hood valve means secured to said catheter adjacent said one end and having open and closed positions for opening and closing the opening thereof;
c) said hood valve means being actuated by a reflux pressure to assume said closed position;
d) said hood valve means including a flap member having a first free end portion; and
e) said flap member extending a distance beyond the open end so that when said hood valve means assumes said closed position, said flap member folds over thereby completely covering the open end and said first free end portion thereof extends beyond the perimeter of the open end.
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Abstract
An anti-refluxive internal ureteral stent includes a ureteral catheter which is closed at its renal end and is provided with lateral perforations only in the upper and middle portions thereof. The stent includes a hood-valve at it vesical end to prevent urinary reflux. The hood-valve comprises a hood-shaped plastic foil that partially surrounds the external circumferential surface of the catheter at the oblique vesical end opening. The hood-valve is open in its resting state so as to allow the urine to flow out through the vesical outlet, unimpeded by the hood-valve, and folds over to close the vesical outlet in response to a reflux pressure generated due to a pressure differential between the catheter and the bladder. The valve remains closed until the pressure differential subsides. The urine flows into the catheter via multiple lateral openings in the upper and middle portions thereof. A gelatin cap generally enclosing the valve may be slipped over the vesical end of the catheter to serve as a stop for the guide-wire during insertion of the stent in a patient. The gelatin cap is pushed off by the guide-wire into the bladder where is it dissolved in the urine. This arrangement permits insertion of the catheter from above without damaging hood-valve during surgical procedures.
157 Citations
17 Claims
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1. An anti-refluxive internal ureteral stent, comprising:
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a) a catheter having an open end; b) hood valve means secured to said catheter adjacent said one end and having open and closed positions for opening and closing the opening thereof; c) said hood valve means being actuated by a reflux pressure to assume said closed position; d) said hood valve means including a flap member having a first free end portion; and e) said flap member extending a distance beyond the open end so that when said hood valve means assumes said closed position, said flap member folds over thereby completely covering the open end and said first free end portion thereof extends beyond the perimeter of the open end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification