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Hemodialysis Blood Transport System

IP.com Disclosure Number: IPCOM000086179D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 55K

Publishing Venue

IBM

Related People

Cavanaugh, DL: AUTHOR [+4]

Abstract

The features set out in this description consist in the design and operation of a blood transport system that will facilitate automated startup, operation and shutdown of the hemodialysis procedure. The system is especially suited to digital computer control and can be implemented in a dialysate transport/ultrafiltration control system. The essential elements of the process are shown in the figure. Features which are new to the hemodialysis process are: 1. Automated flushing of the blood handling system on startup. 2. Automated checkout of accuracy of the saline metering pump and ultrafiltration control system during startup. 3. Provide for development of a predictive control algorithm for automated control of ultrafiltration, prior to the introduction of blood into the system. 4.

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Hemodialysis Blood Transport System

The features set out in this description consist in the design and operation of a blood transport system that will facilitate automated startup, operation and shutdown of the hemodialysis procedure. The system is especially suited to digital computer control and can be implemented in a dialysate transport/ultrafiltration control system. The essential elements of the process are shown in the figure. Features which are new to the hemodialysis process are: 1. Automated flushing of the blood handling system on startup. 2. Automated checkout of accuracy of the saline metering pump and ultrafiltration control system during startup. 3. Provide for development of a predictive control algorithm for automated control of ultrafiltration, prior to the introduction of blood into the system. 4. Automated establishment and maintenance of the liquid level in the bubble trap. 5. Automated pressure testing of the dialyzer on startup. 6. Automated flushing (clean/sterilize) of the blood handling system after the treatment is completed. 7. Automated filing of the blood handling system with sterilizing fluid at the end of the shutdown.

Additional features to the hemodialysis process are possible with the configuration shown. Sensors required in the blood and dialysate systems for these features are indicated. Continuing, these features are: 8. Capability for system control to perform automated or semiautomated calibration and testing of sensors at startup, prior to the introduction of blood into the system. 9. Automated discard of priming saline and automated return of blood to the patient at startup, after manual connection of arterial and venous blood access lines to the patient. 10. Automatically maintain the blood system fluid at a pressure equal to or greater than that of the dialysate system, to prevent a pressure gradient transfer of dialysate components across the membrane. 11. Semiautomated return of blood to the patient at the end of the treatment.

Preferably, the saline 1 and sterilize/clean fluids 3 are contained in flexible plastic bags and, excepting the dialyzer 19, all other fluid channels are rigid walled. The dialyzer 19 is of conventional design. The mode of operation to enable each feature is listed below. 1. Flush or Startup Typically the system is filled with fluid with the patient bypass line 21 in place. The blood pump 6 is reversible and is used to circulate the saline rinse. Saline from supply 1 or 7 is introduced by actuating pump 5 and valve 2 or valve 8, respectively. Effluent saline is discarded through waste line valves 10 or 12, and/or alternately, through the air vent 9. Each supply and each waste line are actuated as necessary to purge all fluid channels. Low-level indicators 13 and 14 may be used to cause automated switching to alternate supplies, if necessary. 2. Metering Check For optimum performance, this step follows the automated flush of Feature 1 and assumes that saline bag...