BLOOD PUMP

• US 3,811,800 A
• Filed: 07/12/1972
• Issued: 05/21/1974
• Est. Priority Date: 07/12/1972
• Status: Expired due to Term

• Current Assignee: Karl Shill
• Original Assignee: Karl Shill
• Inventors: Shill, Karl
• Primary Examiner(s): Freeh, William L.
• Assistant Examiner(s): Gluck, Richard E.
• Application Number:
  US05/271,011
• Time in Patent Office: 678 Days
• Field of Search: 128/DIG.3,214B,214R,214.2 417/317,394,479,474,478,395
• US Class Current: 417/317
• 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• CPC Class Codes: A61M 1/302 having a reservoir for withdrawn untreated blood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 1/307 Time control
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/258 Piston pumps
• CPC Class Codes: A61M 60/284 Linear peristaltic pumps
• CPC Class Codes: A61M 60/37 Haemodialysis, haemofiltration or diafiltration
• CPC Class Codes: A61M 60/43 using vacuum at the blood pump, e.g. to accelerate filling
• CPC Class Codes: A61M 60/435 with diastole or systole switching by valve means located between the blood pump and the hydraulic or pneumatic energy source
• CPC Class Codes: A61M 60/851 Valves
• CPC Class Codes: A61M 60/892 Active valves, i.e. actuated by an external force
• CPC Class Codes: F04B 43/113 the actuating fluid being controlled by at least one valve
• CPC Class Codes: F04B 7/0275 and being deformable, e.g. membranes

Abstract

This invention relates to a pump for an '"'"''"'"''"'"''"'"'artificial kidney machine'"'"''"'"''"'"''"'"', or hemodialysis device; and primarily is designed for the pumping of blood for purification in such a system using the recently announced procedure of '"'"''"'"''"'"''"'"'single needle'"'"''"'"''"'"''"'"' dialysis, whereby a single needle is temporarily inserted into a vein or artery of a patient through which blood is withdrawn from the vein for purification and returned to the patient through the same needle. Such a dialysis system requires, in addition to the filter and pump, a device commonly called an '"'"''"'"''"'"''"'"'occluder'"'"''"'"''"'"''"'"' by means of which purified blood from the filter is prevented from flowing to the needle during the suction stroke of the pump when blood is withdrawn from the patient and is open to flow during the pumping stroke.

Claims

1. A surgical pump comprising:

1. a casing;

2. a longitudinal duct through said casing adapted to receive a blood tube;

3. an inlet valve member in said casing adjacent one end of said duct and an outlet valve member in said casing adjacent the other end of said duct each of said valves comprising;

a. a cylinder within said casing, b. a piston operating in said cylinder, said piston having a projection engaging said blood tube; and

c. means for alternately supplying fluid under pressure to and draining fluid from said cylinder;

4. a pressure tube within said duct and lying adjacent said blood tube;

5. means for supplying fluid under pressure to said pressure tube substantially simultaneously with the opening of said outlet valve and the closing of said inlet valve and for draining said pressure tube and substantially simultaneously opening said inlet valve and closing said outlet valve; and

6. resilient tube adapted to lie in said duct and leading into a discharge line.

2. a longitudinal duct through said casing, said duct being adapted to receive a flexible blood tube,

3. The apparatus of claim 1 comprising also means for measuring the flow from said pressure tube.

4. a drain conduit in said casing for draining fluid,

5. The pumping system of claim 4 wherein the inlet and discharge valves are operated by water pressure which is controlled by respective solenoids.

6. an enlarged chamber adjacent to, and communicating with, said duct between said inlet valve and said outlet valve,

7. a resilient pressure tube in said enlarged chamber,

8. branch conduits leading from said power supply conduit to said inlet valve cylinder, said pressure tube and said discharge valve cylinder,

9. branch conduits leading from said inlet valve cylinder, said pressure tube and said discharge valve cylinder to said drain conduit,

10. flow valves in said branch conduits,

11. means for operating said flow valves,

12. a timer for operating said last mentioned means in sequence to connect said inlet valve and said pressure tube to said pressure supply conduit and close them to drain and simultaneously opening said discharge valve to drain and closing it to the pressure supply conduit;

and alternately open the inlet valve and the pressure tube to drain while closing them to the pressure conduit and simultaneously opening the discharge valve to the pressure conduit while closing it to drain;

13. means for operating an occluder valve simultaneously and in parallel phases with said discharge valve;

and

14. a blood tube adapted to lie in said duct and having a strongly resilient tube encompassing and cemented to the portion of said blood tube adapted to lie within said duct, whereby a vacuum will be applied to said blood tube when the pressure tube is draining.