Unit for pumping fluid, particularly blood

• US 20040001766A1
• Filed: 05/06/2003
• Published: 01/01/2004
• Est. Priority Date: 05/14/2002
• Status: Active Grant

• Current Assignee: Sorin Group Italia SRL (LivaNova Plc)
• Original Assignee: Sorin Group Italia SRL (LivaNova Plc)
• Inventors: Maianti, Edgardo Costa, Ghelli, Nicola, Panzani, Ivo
• Granted Patent: US 7,029,245 B2
• Time in Patent Office: Days
• US Class Current: 417/395
• CPC Class Codes: A61M 1/1698 Blood oxygenators with or without heat-exchangers intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/38 Blood oxygenation
• CPC Class Codes: A61M 60/43 using vacuum at the blood pump, e.g. to accelerate filling
• 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: A61M 60/894 Passive valves, i.e. valves actuated by the blood
• CPC Class Codes: Y10T 137/7838 Plural

Abstract

A unit for pumping fluid, particularly blood, is provided with an enclosure that has two half-shells and an elastic membrane fixed perimetrically to the enclosure in order to divide its space into two parts. One of the half-shells is provided with valves that are located at the opening of two connecting ducts for the intake and delivery of the fluid, and the other half-shell is connected to a line of working fluid that is alternately pressurized and depressurized. The first valve is a disk-shaped sheet made of elastic material. The first valve is in a central position with a support that is fixed to the opening of the first duct for connection to the outside and is suitable to rest at its peripheral region on the support. A second valve is a sheet of elastic material located at the peripheral region of the disk at the opening of the second duct for connection to the outside which lies at the peripheral region of the opening of the first duct.

Claims

1. A device for the pulsed pumping of liquids, particularly blood, comprising:

a body portion;

a pumping chamber disposed within the body portion having an inlet duct and an outlet duct;

an inlet valve support fixed to an opening in the inlet duct;

an inlet valve attached to the inlet valve support for controlling the flow of liquid from the inlet duct into the pumping chamber; and

an outlet valve for controlling the flow of liquid from the pumping chamber to the outlet duct.

2. The device of claim 1 wherein the outlet valve is an annular valve.

3. The device of claim 1 wherein the inlet valve is a disk valve.

4. The device of claim 1 wherein the pumping chamber includes a diaphragm.

5. The device of claim 1 wherein the diaphragm is moved from a first position to a second position by dynamic pressure created by a working fluid.

6. The device of claim 1 wherein the body portion includes an upper portion and a lower portion.

7. The device of claim 6 wherein the inlet duct and the outlet duct are in the upper portion.

8. The device of claim 6 wherein the lower portion includes a fluid port in communication with a working fluid that acts on the diaphragm to alternately pressurize and depressurize the pumping chamber.

9. The device of claim 1 wherein the inlet valve and the outlet valve both comprise a planar elastic material.

10. The device of claim 9 wherein the inlet valve and the outlet valve are coplanar.

11. The device of claim 9 wherein the inlet valve and the outlet valve are arranged on parallel planes.

12. The device of claim 1 further having a circumferential ring attached to the upper portion, the circumferential ring having a circumferential cavity connected to receive fluid from the outlet duct.

13. The device of claim 12 wherein the circumferential ring is eccentric to the inlet duct.

14. The device of claim 12 wherein the circumferential ring is coaxial to the inlet duct.

15. The device of claim 1 further comprising an oxygenation chamber in fluid communication with the outlet duct.

16. The device of claim 1 further comprising a heat exchanger in fluid communication with the inlet duct.