Urethral catheter
First Claim
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1. A urethral catheter comprising a resilient tube open at the proximal and distal ends respectively, the tube wall, throughout at least a portion of that part of the tube to be situated within the urethra, being deformable;
- having a certain normal cross-sectional area in an open, non-deformed state, to which it returns freely in the absence of external transmural pressure;
being sufficiently compliant to conform freely to the internal shape of the urethral lumen thereby substantially preventing the by-pass of urine; and
being sufficiently self supporting and flexural to an open configuration such that the maximum transmural pressure required to collapse the tube to half said normal cross-sectional area is 100 cm water gauge.
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Accused Products
Abstract
A urethral catheter comprising a tube for insertion into the bladder and having an inlet (17) for the drainage of urine via the tube, and a wall portion (18) having reduced thickness and increased flexural properties such that this wall portion (18) will undergo substantially complete collapse under normal urethral pressure thus to comply with the irregular and slit-like lumen (11) but permit adequate distension for normal drainage.
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Citations
11 Claims
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1. A urethral catheter comprising a resilient tube open at the proximal and distal ends respectively, the tube wall, throughout at least a portion of that part of the tube to be situated within the urethra, being deformable;
- having a certain normal cross-sectional area in an open, non-deformed state, to which it returns freely in the absence of external transmural pressure;
being sufficiently compliant to conform freely to the internal shape of the urethral lumen thereby substantially preventing the by-pass of urine; and
being sufficiently self supporting and flexural to an open configuration such that the maximum transmural pressure required to collapse the tube to half said normal cross-sectional area is 100 cm water gauge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- having a certain normal cross-sectional area in an open, non-deformed state, to which it returns freely in the absence of external transmural pressure;
Specification