Carbon dioxide gas removal from a fluid circuit of a dialysis device
The present invention is directed to degassing devices for dialysate circuits. One embodiment has a first housing and a second housing positioned within the first housing in an annular relationship. A second embodiment comprises a dialysate regeneration system with urease, a dialyzer, and a housing with an external wall, where the external wall is exposed to atmosphere and comprises a material that passes gas but does not pass liquid and where the housing is positioned between the urease and dialyzer.
1. A wearable dialysis system comprising:
a. a wearable dialyzer that removes solutes from impure blood into dialysate;
b. a wearable pump that pumps blood and dialysate through the dialyzer;
c. a wearable dialysate regeneration system comprising urease in fluid communication with the dialysate; and
d. a wearable degassing device in fluid communication with the dialysate regeneration system, the degassing device comprising a dialysate degassing tube having an external wall exposed to atmosphere, the wall comprising a material that passes gas but does not pass liquid in any orientation of the degassing device.
2. The wearable dialysis system of claim 1 , wherein the degassing device is positioned between the urease and the dialyzer.
3. The wearable dialysis system of claim 1 , wherein the dialysate degassing tube is configured as a coil of tubing.
4. The wearable dialysis system of claim 3 , wherein the coil of tubing has a length in a range of between about 0.5 feet and about 16 feet.
5. The wearable dialysis system of claim 1 , wherein the dialysate degassing tube has an outer diameter in a range of between of about 0.1 and about 0.45 inches.
6. The wearable dialysis system of claim 1 , wherein the dialysate degassing tube has an inner diameter in a range of between of about 0.1 and about 0.4 inches.
7. The wearable dialysis system of claim 1 , wherein the degassing device removes substantially all gas from the dialysate at dialysate flow rates in a range of between about 20 ml/min and about 200 ml/min.
8. The wearable dialysis system of claim 1 , wherein the degassing device removes substantially all gas from the dialysate at internal pressures less than or equal to about 10 psi gauge pressure.
9. The wearable dialysis system of claim 1 , wherein the dialysate regeneration system further comprises charcoal, and wherein the degassing device is positioned between the charcoal and the dialyzer.