| 摘要 |
<p>An antireflux internal ureteral duct (4) in the form of a ureteral catheter (4) closed at the kidney end and having lateral perforations (5) only in the upper and middle sections is fitted with a cap valve at the opening into the bladder to prevent the back-flow of urine. The cap valve (7) comprises a cap-shaped plastic film which partly surrounds the periphery of the bevelled bladder-side end (6) of the catheter. The pressure differential created by the accumulation of urine deforms said film, which closes the catheter opening until the increased pressure in the bladder is relieved. Urine flows into the catheter (4) through openings (5) in the upper and middle sections. The wall of the lower section is closed. Urine is discharged through the bladder-side catheter outlet (6), which is fully open in the non-actuated cap valve (7). A gel cap (12) which surrounds the cap valve (7) and on which the degradable guide wire (9) abuts during insertion of the catheter can be fitted over the bladder-side end (6). The gel cap (12) is pushed off into the bladder by the guide wire (9) when the internal ureteral catheter (4) is correctly positioned and dissolves in the urine. This permits direct insertion of the catheter (4) from above, for example during a cutting operation, without damaging the delicate cap valve (70).</p> |
