Fluid and air handling in blood and dialysis circuits
First Claim
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1. A blood priming method comprising:
- (a) running a dialysate pump to pull blood from a patient into an extracorporeal blood circuit in a first direction and displacing a priming liquid to a drain for a number of pump cycles or for a given time by flowing the priming liquid through a line connecting the extracorporeal blood circuit to the drain so that the priming liquid does not pass through a blood filter; and
(b) running a blood pump to pull blood from the patient into the extracorporeal blood circuit in a second direction and displacing the priming liquid to the drain for a number of pump cycles or for a given time by flowing the priming liquid through the line connecting the extracorporeal blood circuit to the drain so that the priming liquid does not pass through the blood filter.
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Abstract
An air purging method includes: (a) detecting a low fluid level in a blood circuit indicating a high amount of air in the blood circuit; (b) stopping a blood pump; (c) closing a venous patient line; (d) opening a blood circuit air vent valve and a drain valve; and (e) running the blood pump to meter air through the air vent valve and the drain valve to a drain.
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Citations
6 Claims
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1. A blood priming method comprising:
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(a) running a dialysate pump to pull blood from a patient into an extracorporeal blood circuit in a first direction and displacing a priming liquid to a drain for a number of pump cycles or for a given time by flowing the priming liquid through a line connecting the extracorporeal blood circuit to the drain so that the priming liquid does not pass through a blood filter; and (b) running a blood pump to pull blood from the patient into the extracorporeal blood circuit in a second direction and displacing the priming liquid to the drain for a number of pump cycles or for a given time by flowing the priming liquid through the line connecting the extracorporeal blood circuit to the drain so that the priming liquid does not pass through the blood filter. - View Dependent Claims (2)
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3. A blood priming method comprising:
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(a) running a dialysate pump to pull blood from a patient venous access into an extracorporeal blood circuit in a first direction and displacing a priming liquid to a dialysate circuit for a number of pump cycles or for a given time, the priming liquid flowing through a line connecting the extracorporeal blood circuit to the dialysate circuit to bypass a blood filter to reach the dialysate circuit; and (b) running a blood pump to pull blood from the patient arterial access into the extracorporeal blood circuit in a second direction and displacing the priming liquid to the dialysate circuit for a number of pump cycles or for a given time, the priming liquid flowing through the line connecting the extracorporeal blood circuit to the dialysate circuit to bypass the blood filter to reach the dialysate circuit. - View Dependent Claims (4, 5, 6)
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Specification