Machine for Extracorporeal Blood Treatment

• US 20080221496A1
• Filed: 11/24/2005
• Published: 09/11/2008
• Est. Priority Date: 07/29/2005
• Status: Active Grant

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro Lundia AB (Baxter International Inc.)
• Inventors: Baraldi, Vincenzo
• Granted Patent: US 8,403,874 B2
• Time in Patent Office: Days
• US Class Current: 604/4.01
• CPC Class Codes: A61M 1/3672 Means preventing coagulation
• CPC Class Codes: A61M 2209/082 Mounting brackets, arm supports for equipment
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir

Abstract

In a machine for extracorporeal blood treatment, a syringe pump (4) for infusion of an anticoagulant comprises a support (5) for the syringe, a pusher (6), a sensor of the pushing force of the pusher (6), and a control unit (8) for guiding the pusher (6) in accordance with the force measured by the sensor. The support comprises a series of interchangeable gripping elements (9), each of which defines a housing for a syringe having a different diameter, the housing having a longitudinal axis which, for all of the interchangeable gripping elements in the series, is always in the same position in relation to the pusher. The invention provides a dialysis machine with a pump that is easily and rapidly adaptable for syringes over a wide range of sizes.

Claims

1-6. -6. (canceled)

7. A syringe pump, comprising:

a support for holding a syringe in an operating position;

a pusher for moving a mobile part of the syringe;

a sensor for emitting a signal indicating a pushing force exerted by the pusher; and

a control unit for receiving the signal and for guiding the pusher in accordance with the signal received;

wherein the support comprises one of a series of interchangeable gripping elements and a seating for receiving the gripping elements in a predetermined position, each gripping element of the series of gripping elements being conformed in such a way as to define a housing for a fixed part of the syringe, the housing of a gripping element having a different diameter with respect to another gripping element of the series of gripping elements and also having a longitudinal axis which coincides with an axis of the syringe in an operating position, each gripping element of the series of gripping elements being conformed in such a way that when the gripping element is received in the seating in the predetermined position, the longitudinal axis of the housing is in a predetermined relative position with respect to the pusher, the predetermined relative position being a same for all the interchangeable gripping elements of the series of gripping elements.

8. The pump of claim 7, wherein each gripping element comprises:

two gripping arms which are elastically deformable in order to embrace a diameter of the fixed part of the syringe, a frontal opening being afforded between the two gripping arms for introducing a diameter of the fixed part of the syringe, the gripping arms being further elastically openable for introducing the syringe by forcing and for keeping the syringe in position;

a first striker element for limiting axial movement in a first direction of the fixed part of the syringe, the first striker element being positioned at a predetermined axial position from the gripping arms in order to define, in collaboration with the arms, a cavity for receiving a radial projection of the fixed part of the syringe, the deformable gripping arms defining a second striker element for the radial projection for limiting the axial movement of the fixed part of the syringe in a second direction, opposite to the first direction.

9. The pump of claim 7, wherein the seating for receiving the interchangeable gripping elements comprises a linear sliding guide parallel to the longitudinal axis of the housing of the fixed part of the syringe.

10. The pump of claim 7, comprising a sensor for detecting a means for identification borne by each interchangeable gripping element and for sending a recognition signal of the gripping element to the control unit.

11. A machine for extracorporeal blood treatment, comprising:

a blood pump for blood circulation in an extracorporeal circuit; and

a syringe pump for infusion of a liquid in the extracorporeal blood circuit;

wherein the syringe pump is realised according to claim 7.

12. A series of interchangeable gripping elements for a syringe of a syringe pump, the syringe pump comprising a support for holding a syringe in an operating position and a pusher for moving a mobile part of the syringe, the support comprising a seating for receiving the gripping elements in a predetermined position, each gripping element of the series of gripping elements being conformed in such a way as to define a housing for a fixed part of the syringe, the housing of a gripping element having a different diameter with respect to another gripping element of the series of gripping elements and also having a longitudinal axis which coincides with an axis of the syringe in an operating position, each gripping element of the series of gripping elements being conformed in such a way that when the gripping element is received in the seating in the predetermined position, the longitudinal axis of the housing is in a predetermined relative position with respect to the pusher, the predetermined relative position being a same for all the interchangeable gripping elements of the series of gripping elements.

13. The series of claim 12, wherein each gripping element comprises:

two gripping arms which are elastically deformable in order to embrace a diameter of the fixed part of the syringe, a frontal opening being afforded between the two gripping arms for introducing a diameter of the fixed part of the syringe, the gripping arms being further elastically openable for introducing the syringe by forcing and for keeping the syringe in position;

a first striker element for limiting axial movement in a first direction of the fixed part of the syringe, the first striker element being positioned at a predetermined axial position from the gripping arms (11) in order to define, in collaboration with the arms, a cavity for receiving a radial projection of the fixed part of the syringe, the deformable gripping arms defining a second striker element for the radial projection for limiting the axial movement of the fixed part of the syringe in a second direction, opposite to the first direction.