Dual phase blood flow system and method of operation

• US 4,490,134 A
• Filed: 09/24/1982
• Issued: 12/25/1984
• Est. Priority Date: 09/24/1982
• Status: Expired due to Fees

• Current Assignee: Baxter Travenol Laboratories Incorporated One Baxter Parkway Deerfield Illinois 60015
• Original Assignee: Extracorporeal Medical Specialties Incorporated
• Inventors: Troutner, Vernon H.
• Primary Examiner(s): Coven, Edward M.
• Application Number:
  US06/423,378
• Time in Patent Office: 823 Days
• Field of Search: 604/4, 604/5, 128/DIG. 3, 210/321.2, 210/321.3
• US Class Current: 604/6.05
• CPC Class Codes: A61M 1/30 Single needle dialysis ; Reciprocating systems, alternately withdrawing blood from and returning it to the patient, e.g. single-lumen-needle dialysis or single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 1/302 having a reservoir for withdrawn untreated blood
• CPC Class Codes: A61M 1/303 having a reservoir for treated blood to be returned
• CPC Class Codes: A61M 1/306 Pressure control, e.g. using substantially rigid closed or gas buffered or elastic reservoirs
• CPC Class Codes: A61M 1/308 Volume control, e.g. with open or flexible containers, by counting the number of pump revolutions, weighing
• CPC Class Codes: Y10S 128/03 Heart-lung

Abstract

A blood flow system for processing blood has two phases of operation, an arterial phase and a venous phase. During the arterial phase, the system is filled with blood through operation of an arterial blood pump. When a predetermined blood pressure level in the system has been attained, the arterial blood pump is inactivated and a venous blood pump removes blood from the system for a given number of pump turns.

Claims

1. A blood processing system for a patient comprising:

means for withdrawing blood from said patient;

a first arterial blood pump having an input coupled to said withdrawing means and an output at which a flow of blood is provided when said pump is activated;

means for processing blood having an input coupled to the output of said arterial blood pump and an output at which a flow of processed blood is produced;

a flexible blood accumulator having an inlet coupled to said output of said means for processing blood and having an output, said accumulator exhibiting a known blood capacity when full;

a second venous blood pump having an input coupled to the output of said flexible bag accumulator, and an output;

means, coupled to the output of said venous blood pump, for returning processed blood to said patient, wherein said blood processing system exhibits a given blood capacity when full said capacity corresponding to a dialyzer outlet pressure in the range of approximately 20 mmHg pressure;

a monitor associated with flexible bag accumulator for detecting the attainment of said given blood capacity; and

blood pump control means, coupled to said pumps and said monitor, for activating said venous blood pump upon detection of said given blood capacity, and for activating said arterial blood pump after said venous blood pump has been activated for a given number of operating cycles.

3. The blood processing system of claims 1 or 2, wherein said monitor comprises a pressure transducer coupled between said dialyzer and said venous blood pump for measuring venous blood pressure.

4. The blood processing system of claims 1 or 2, further comprising:

means, coupled between said venous blood pump and said blood pump control means, for detecting operating cycles of said venous blood pump and communicating said operating cycle information to said control means.

5. The blood processing system of claim 4, wherein said blood pump control means includes a microprocessor, and wherein said operating cycle detecting means includes a slot encoder.

2. A blood processing system for a patient comprising:

means for withdrawing blood from said patient;

a first arterial blood pump having an input coupled to said withdrawing means and an output at which a flow of blood is provided when said pump is activated;

means for processing blood having an input coupled to the output of said arterial blood pump and an output at which a flow of processed blood is produced;

a flexible blood accumulator having an inlet coupled to said output of said means for processing blood and having an output, said accumulator exhibiting a known blood capacity when full;

a second venous blood pump having an input coupled to the output of said flexible bag accumulator, and an output;

means, coupled to the output of said venous blood pump, for returning processed blood to said patient;

a pressure monitor associated with said flexible bag accumulator for detecting the blood pressure therein; and

blood pump control means, coupled to said pumps and said monitor, for activating said venous blood pump when said detected blood pressure of said blood processing system attains a pressure in the range of approximately 20 mmHg, and for activating said arterial blood pump after said venous blood pump has been activated for a given number of operating cycles.