Method and system for driving blood pumping devices

• US 4,548,550 A
• Filed: 05/11/1984
• Issued: 10/22/1985
• Est. Priority Date: 05/11/1983
• Status: Expired due to Term

• Current Assignee: Nippon Zeon Co., Ltd. (BASF SE)
• Original Assignee: Nippon Zeon Co., Ltd. (BASF SE)
• Inventors: Tsuji, Takashi
• Primary Examiner(s): Smith, Leonard E.
• Application Number:
  US06/609,084
• Time in Patent Office: 529 Days
• Field of Search: 417/390, 417/392, 417/394, 417/395, 417/478, 91/31, 91/6, 604/151, 604/153
• US Class Current: 417/390
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/427 the force acting on the blood contacting member being hydraulic or pneumatic
• CPC Class Codes: A61M 60/43 using vacuum at the blood pump, e.g. to accelerate filling
• CPC Class Codes: A61M 60/508 Electronic control means, e.g. for feedback regulation
• CPC Class Codes: A61M 60/892 Active valves, i.e. actuated by an external force
• CPC Class Codes: A61M 60/894 Passive valves, i.e. valves actuated by the blood

Abstract

A method and system for pneumatically driving a pump for an artificial heart is disclosed which can pump blood as approximate as possible to the natural heart without increasing the capacity of any pressure tank. A compensation drive pressure which compensates for the drop of the drive pressure is additionally applied to the pump whenever the drive pressure is applied to the pump.

Claims

1. A driving method for a blood pumping device which is driven by applying to a driving portion of a blood pumping device positive and negative pressures alternatively from a positive pressure tank connected through a pressure regulating valve to a high pressure source and a negative pressure tank connected through a pressure regulating valve to a negative pressure source, comprising when the positive pressure of both the positive and negative pressures are exerted on the above driving portion, compensating pressures for pressure drop and rise in the positive and negative pressure tanks are exerted thereon in synchronism therewith without going through the pressure regulating valves.

2. A system for driving a pump which is of a type pneumatically driven by being alternatively applied with positive and negative pressures comprising

(a) a positive pressure source for producing a high pressure;

(b) a positive pressure tank for accumulating the positive pressure generated by the positive pressure source;

said positive pressure tank being connected with the positive pressure source;

(c) a positive pressure regulating valve between the positive pressure source and the positive pressure tank for regulating the pressure from the positive pressure source into a given pressure;

(d) a negative pressure source for producing a negative pressure;

(e) a negative pressure tank for accumulating the negative pressure generated by the negative pressure source;

said negative pressure tank being connected with the negative pressure source;

(f) a negative pressure regulating valve between the negative pressure source and the negative pressure tank for regulating the pressure from the negative pressure source into a given pressure;

(g) a change-over valve for alternatively connecting the positive and negative pressure tanks with a port which is to be connected with the pump;

(h) a positive pressure branch having an inlet between the positive pressure source and the positive pressure regulator and an outlet between the positive pressure regulator and the pump for applying a pressure higher than that from the positive tank when the latter is applied upon the pump; and

(i) a negative pressure branch having an inlet between the nagative pressure source and the negative pressure regulator and an outlet between the negative pressure regulator and the pump for applying a pressure lower than that from the negative pressure tank when the latter is applied upon the pump.

3. The system as defined in claim 2 in which the outlets of the positive and negative pressure branches are connected to the outlet of the system.

4. The system as defined in claim 2 in which the outlets of the positive and negative pressure branches are connected to the positive and negative pressure tanks respectively.

5. The system as defined in claim 2 in which the positive and negative pressure branches have positive and negative sub-pressure tanks respectively which contain pressures higher and lower than that in the positive and negative tanks respectively.

6. The system as defined in claim 5 in which the outlets of the positive and negative pressure branches are connected to the outlet of the system.

7. The system as defined in claim 5 in which the outlets of the positive and negative pressure branches are connected to the positive and negative pressure tanks respectively of the system.

8. The system as defined in any one of claims 2 to 7 in which each of the branches has valves for pressure regulation and the timing control of the pressure application.