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Denver Ascites Shunt PAK 42-2050/42-2055 - CareFusion

Denver Ascites Shunt PAK 42-2050/42-2055 - CareFusion

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<strong>Shunt</strong> Description<br />

The <strong>Denver</strong> Peritoneo-Venous <strong>Shunt</strong> (Figure 1)<br />

consists of a fenestrated peritoneal catheter, a<br />

venous catheter, and a flexible pump chamber<br />

containing either one or two miter valves. The heart<br />

of the system is the valved pump chamber. When the<br />

pressure in the peritoneal cavity is approximately 3 cm<br />

water higher than the central venous pressure, the<br />

valves open and permit flow through the shunt. In a<br />

double-valved shunt, the second valve serves as a<br />

check valve which helps prevent reflux of blood into<br />

the distal end of the venous catheter when the unit is<br />

manually pumped. In a single-valved shunt, reflux is<br />

prevented by manual occlusion of the venous<br />

catheter. The valves are made deliberately<br />

asymmetrical, causing them to be self-cleaning.<br />

Figure 1: Peritoneo-venous <strong>Shunt</strong>s<br />

The entire device is constructed from medical-grade<br />

silicone rubber. No connections at surgery are<br />

required. The venous tubing may be shortened for<br />

optional positioning in the superior vena cava and the<br />

peritoneal catheter may be shortened for the best<br />

placement in the peritoneal cavity. An integral barium<br />

sulfate stripe in the wall of the peritoneal and venous<br />

catheters permits visualization by fluoroscopy or with<br />

a roentgenogram to confirm proper positioning at the<br />

time of surgery.<br />

Silique, a unique surface treatment, has been applied<br />

to the shunts. This treatment provides a smoother,<br />

less tacky surface with a lower coefficient of friction.<br />

Silique surface treatment is a permanent treatment<br />

that will not leach, wear, or flake off. Silique surface<br />

treatment does not change the bulk physical<br />

properties of silicone and therefore does not change<br />

the strength, flexibility, or flow properties of the<br />

shunt.<br />

The flow rate for each shunt is determined using<br />

water as the working media. All flow rates are<br />

determined at a temperature of 70º F with a head<br />

pressure of 10 cm.<br />

Flow rates tend to increase as fluid temperature<br />

increases. Flow rates tend to decrease as the fluid<br />

becomes more viscous.<br />

Indications<br />

Peritoneo-venous shunting is indicated for patients<br />

with:<br />

• chronic liver disease whose ascites has not<br />

responded to surgical correction of their portal<br />

hypertension nor to standard medical<br />

management.<br />

• persistent ascites who are not considered<br />

candidates for portal-venous shunting.<br />

• persistent ascites that is non-responsive to<br />

standard medical management.<br />

• primary or metastatic intra-abdominal neoplasms<br />

with massive ascites to help relieve intraabdominal<br />

pressure.<br />

Venous Catheter<br />

0.39 cm OD<br />

66 cm<br />

0.23 cm ID<br />

(11.5 Fr.)<br />

Caution: Benefits of instituting peritoneo-venous<br />

Radiopaque<br />

Stripe<br />

shunting in patients with neoplastic ascites should<br />

be weighed against the potential hazards of<br />

Second One-<br />

Way Valve<br />

dissemination of ascitic fluid containing malignant<br />

Suture Pad<br />

cells.<br />

First One-<br />

Way Valve<br />

Peritoneo-venous shunting should also be<br />

Radiopaque<br />

considered for patients with hepatorenal syndrome,<br />

Stripe<br />

chylous ascites and idiopathic ascites. Peritoneal<br />

Catheter<br />

0.51 cm OD<br />

Contraindications<br />

0.27 cm ID<br />

Peritoneo-venous shunting is<br />

(15.5<br />

contraindicated<br />

Fr.)<br />

for<br />

27 cm<br />

patients with:<br />

• peritonitis<br />

7.7 cm<br />

• possible non-sterile ascitic fluid or intra-abdominal<br />

infection<br />

Pump Chamber<br />

• acute tubular necrosis or primary renal failure<br />

• extremely high bilirubin and /or creatinine levels<br />

In general, shunting should be avoided in the<br />

presence of any systemic infection.<br />

Patients with a recent history of gastrointestinal<br />

bleeding should be evaluated for portal hypertension.<br />

Correction of the portal hypertension should be<br />

considered prior to insertion of a peritoneo-venous<br />

shunt.<br />

The presence of marginal cardiac function is a<br />

relative contraindication to shunt placement for those<br />

patients who may not tolerate the increased<br />

circulatory load associated with peritoneo-venous<br />

shunting.<br />

Use of the subclavian vein for catheterization is not<br />

recommended for individuals who may require the<br />

construction of a permanent venous access for<br />

hemodialysis. Thrombosis or severe stenosis of the<br />

subclavian vein, which may result from the presence<br />

of the venous catheter, is not compatible with an A-V<br />

fistula in the ipsilateral arm.<br />

66 cm<br />

(11.5 Fr.)<br />

(15.5 Fr.)<br />

27 cm<br />

1

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