Ureteral Plastic Valves in Dogs

Furey, Clement A.

doi:10.1016/s0022-5347(17)65373-4

Cited by 19 publications

(5 citation statements)

References 10 publications

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“…Our in vitro experi ments showed that increasing intravesical pressure kinks the sleeve and prevents reflux into the prothesis. K ohler's initial success in controlling reflux by use of a mechanical valve [6] could not be subsequently con firmed [4].…”

Section: Discussionmentioning

confidence: 99%

Ureteral Replacement with Synthetic Prothesis in Dogs

Wagenknecht¹,

Auvert²,

Sausse³

1972

Eur Surg Res

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Eleven ureteral replacements by Rhodergon-Scurasil® protheses were performed in 7 dogs. The production of the prothesis and the technique of the operation are described. Slight dilation of the upper urinary tract, noted 10 days after operation by X-ray television and IVP, diminished continuously thereafter in all dogs. Bilateral substitution of the ureter was done in 4 dogs. Following the replacement of the second ureter by a prothesis, the side first operated upon again showed a moderate dilation, while the second side remained highly satisfactory. Evacuation of the urine via the rigid prothesis was assured by peristaltic waves initiated in the remaining 2 cm of the upper ureter. In order to avoid vesicoureteral reflux in future experiments, a model of a sleeve-valve mechanism is presented.

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Section: Discussionmentioning

confidence: 99%

Ureteral Replacement with Synthetic Prothesis in Dogs

Wagenknecht¹,

Auvert²,

Sausse³

1972

Eur Surg Res

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“…[6]. Throughout the test, the tangential friction force FT and direct current voltage U are both plotted versus specimen revolutions.…”

Section: Friction-seizure Test Designmentioning

confidence: 99%

Some stressing and environmental parameters related to phosphate-stearate coating performance in cold forging of steel

1996

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A friction-seizure test procedure is proposed to analyze phosphate/stearate coating performance in relation to stressing conditions. Test results, including the occurrence of hydrodynamic lubrication, mixed lubrication and seizure at the slider/specimen coated interface, are related to effective phosphate bonding and to lubricant reactive effects. The soap settling process is analyzed in terms of seizure sensitiveness and coating aging is studied in relation to moisture content and temperature. The effects of coating surface temperature on the occurrence of lubrication type and seizure are also analyzed for reactive and unreactive soaps. Stressing conditions such as sliding velocity and contact pressure are studied and a coating behaviour law for seizure is finally proposed.

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“…In the early 1950s, the silicone rubber catheter (100% silicone) was introduced to urological use (De Nicola, 1950). Silicone elastomer coated catheters have been used since the middle of the 1950s (Sherwood, 1965) and teflon coated ones since the early 1960s (Furey, 1961). Little attention has been paid to the possible tissue toxicity effects of urinary catheters and there are no international standards for tissue toxicity testing.…”

Section: After Davis and Foley Independently Developedmentioning

confidence: 99%

Urinary Catheter Structure and Testing Methods in Relation to Tissue Toxicity

Talja

Ruutu

Andersson

et al. 1986

British Journal of Urology

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Eluates from 56 latex urinary catheters from seven manufacturers were divided into three categories according to covering material (siliconized, silicone elastomer coated and teflon coated) and tested for tissue toxicity by means of cell cultures based on the inhibition of DNA synthesis. The silicone elastomer coated catheters showed the lowest toxicity. Only 4 of 13 such catheters gave unacceptable toxic values, whereas half of the siliconized catheters were abandoned as toxic. Teflon and elastomer coatings had the best protective properties against toxic substances leaching from the catheter core. The surface contour of the catheters estimated by scanning electron microscopy (SEM) did not correlate with toxicity, whereas the cracks seen on the catheters did correlate with toxicity. The simple in vivo test methods used by the manufactures turned out to be insensitive to tissue toxicity testing of urinary catheters. The method used in this study was the most reliable for assessing the safety of latex urinary catheters. Thus manufacturers using multiple and in vitro cell culture tests had products of better quality than those using only a single test or simple in vivo tests.

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Ureteral Plastic Valves in Dogs

Cited by 19 publications

References 10 publications

Ureteral Replacement with Synthetic Prothesis in Dogs

Ureteral Replacement with Synthetic Prothesis in Dogs

Some stressing and environmental parameters related to phosphate-stearate coating performance in cold forging of steel

Urinary Catheter Structure and Testing Methods in Relation to Tissue Toxicity

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